Title of Invention	SCRAPERS FOR LINK CHAINS OF SCRAPER CHAIN CONVEYORS AND SCRAPER-SECURING ELEMENT THEREFOR
Abstract	The invention relates to scrapers 10 for link chains of in particular double center scraper chain conveyors, comprising a one-part scraper body with a head web 2 connecting two lateral scraper wings 1 and at least one insertion pocket 5 for insertion of a horizontal chain link 52 of the link chain and securing scraper 10 by means of a detachable scraper-securing element 40. In order to improve the entrainment of scrapers 10 connected to the horizontal chain links and to be able to use the scrapers even with novel link chains, grooves extend in insides 11 of scraper wings 1 and outsides of an intermediate web 6 over the height of limb beds 15 up to head web 2 and form receivers for entrainment projections 58 on the outer surfaces of limbs 56 of horizontal chain links 52. The invention also relates to scraper-securing element 40.

Title of Invention

SCRAPERS FOR LINK CHAINS OF SCRAPER CHAIN CONVEYORS AND SCRAPER-SECURING ELEMENT THEREFOR

Abstract

The invention relates to scrapers 10 for link chains of in particular double center scraper chain conveyors, comprising a one-part scraper body with a head web 2 connecting two lateral scraper wings 1 and at least one insertion pocket 5 for insertion of a horizontal chain link 52 of the link chain and securing scraper 10 by means of a detachable scraper-securing element 40. In order to improve the entrainment of scrapers 10 connected to the horizontal chain links and to be able to use the scrapers even with novel link chains, grooves extend in insides 11 of scraper wings 1 and outsides of an intermediate web 6 over the height of limb beds 15 up to head web 2 and form receivers for entrainment projections 58 on the outer surfaces of limbs 56 of horizontal chain links 52. The invention also relates to scraper-securing element 40.

Full Text	Scrapers for link chains of scraper chain conveyors and scraper-securing element therefor The invention relates to scrapers for link chains of scraper chain conveyors, in particular double center scraper chain conveyors, comprising a one-part scraper body with a head web connecting two lateral scraper wings and at least one insertion pocket between the scraper wings for insertion of a horizontal chain link of the link chain and securing the scraper on an inserted horizontal chain link by means of a detachable scraper-securing element which can be connected to the head web, wherein the insides facing one another of the scraper wings are provided below the head web with a groove, the head web has on both front sides bearing zones for the fronts of vertical chain links of the link chain and on its underside on both sides of the bearing zones a limb bed for limbs of the horizontal chain links of the link chain. The invention also relates to the scraper-securing element provided for these scrapers. A generic scraper is known from DE 102 25 341 Cl. The known scraper can be fixed to link chains whose horizontal and vertical chain links in each case comprise oval ring eyelet members with round chain fronts. Fixing of the scraper on the horizontal chain links of these link chains is performed by means of a securing strap which runs in one piece between both insides of the scraper wings and clamps the horizontal chain links from below against the underside of the head web. The securing of the strap on the head web against detachment is performed by means of dowel pins which can be inserted into through bores, which dowel pins penetrate through the pins which are formed on the upper side of the strap and engage with corresponding locking recesses in the head web. DE 197 01 579 Al discloses a link chain whose front sections have straight front zones and whose vertical chain links have a wire cross-section which is constant around the full circumference and is provided on the outer periphery with a flat section. A link chain formed in this manner can also be used in high- performance scraper chain conveyors and the chain links are subject to less wear than those of a standard scraper chain with vertical and horizontal round wire chain links. The scrapers known from DE 197 01 579 Al have, for connection to this link chain, a head web on whose underside a pin projects onto which a horizontal web chain link having a transverse web can be pushed and can be fixed by means of separate locking rails. In one particular configuration of scraper and horizontal chain link, the passages in the transverse webs can also be formed substantially T-shaped. This configuration enables a positive-locking closure of pin and transverse web, wherein the chain links can be mounted at the pins only in a defined swivel position. The scrapers provided in DE 197 01 579 Al require special horizontal web chain links with transverse web and are also not suitable for withstanding the large forces which occur with a high-performance conveyor. The object of the invention is to create a scraper in particular for a link chain with special chain links which has a sufficiently long lifetime and is reliably entrained even in the case of large width and thus high potential conveying power and with low wear by the horizontal chain links of a link chain. These and further objects are achieved according to the invention in that the grooves in the insides of the scraper wings extend over the height of the limb beds up to the head web and form receivers for entrainment projections on the outer faces of the limbs of the horizontal chain links. The scrapers according to the invention are particularly suitable for a link chain which the applicant has developed together with the scrapers and which is the subject matter of a parallel application with the same filing date. In this link chain, entrainment projections which can cooperate with the receivers formed by the grooves on the scrapers by positive fit are formed on the outer surfaces of the limbs of the horizontal chain links in order, as a result, to move the scrapers evenly and well-supported in the conveying direction preferably in a pushing manner. In order to achieve this, the grooves in the scraper wings extend on both sides of the limb beds up to the head web such that particularly reliable, even and also low-wear entrainment of the scrapers is achieved in the running direction of the link chain due to the engagement of the entrainment projections with the grooves in the scraper. In the case of the particularly preferred configuration, the grooves in the insides extend up to the underside of the scraper wings. This not only enables precise placing and insertion of the horizontal chain links, but rather the grooves can, as is explained further below, also fix and hold a scraper- securing element by positive fit in the direction of movement. The invention can in principle also be used in the case of scrapers for single center scraper chain conveyors in which only two grooves are formed in the insides of the scraper wings and a scraper-securing element extends between these two grooves in the insides of the scraper wings. However, the preferred configuration of the scrapers has an intermediate web located at the head web between both scraper wings, which intermediate web in each case delimits an insertion pocket at one side with its outsides which face the insides and also has in each case a groove in the outside, which groove extends over the height of the limb beds up to the head web and forms a receiver for an entrainment projection on the outer surface of the limbs of the horizontal chain links. A corresponding scraper then has two insertion pockets lying next to one another for horizontal chain links of the link chain strands lying next to one another of a double center chain. Each horizontal chain link inserted into an insertion pocket then engages with its entrainment projections at one side of the chain bed with a groove on the inside of one of the scraper wings and on the other side of the chain bed with a groove in the outside of the intermediate web. According to one potential configuration, a scraper-securing element could then be provided which furthermore extends exclusively between both grooves in the insides and, as a one-part scraper- securing element, simultaneously secures both inserted horizontal chain links on the scraper against falling out. Nevertheless, this particularly preferred configuration provides that the grooves also reach in the outsides up to the underside of the central web, wherein the underside of the central web is then formed substantially flush with the undersides of the scraper wings in order to improve the bearing of the scrapers on the conveyor base of a conveyor. Two insertion pockets are therefore present, into which in each case a horizontal chain link with an associated scraper- securing element can be inserted and secured against falling out. In the case of the particularly preferred configuration, the limb beds are formed for insertion of horizontal chain links which have straight front zones on the front sections and recesses provided with entrainment projections in the outer surfaces of the limbs connecting the front sections to one another. Moreover, the bearing zones are preferably formed at the head web of the scraper for supporting of vertical chain links of a link chain, whose wire cross-section is constant around the full circumference and is provided on the outside with a flat section and on the inside preferably with a circular camber, wherein bevels are preferably formed at the transition of the flat section to the circular arc. It is particularly advantageous for receiving of the horizontal chain links of a corresponding scraper link chain if the limb beds comprise surfaces which run out flat towards the insides of the scraper wings and/or the outsides of the intermediate web, on which surfaces the substantially rectangular horizontal chain links can then be particularly well supported. The fixing of the scraper-securing element on the scraper is preferably performed by means of a fixing screw and a nut which cooperates therewith. To this end, it is particularly advantageous if a screw passage for the shaft of the fixing screw and/or a recess for insertion of a nut which cooperates with the fixing screw is/are formed in the head web between both bearing zones. It is particularly advantageous if an introduction inclination for a detachment tool opens into each recess in order to be able to detach a potentially rusted-tight nut from the shaft of the fixing screw even after many hours of operation. In this case, the detachment or tightening of the nut can be performed particularly advantageously from above and thus with easy access at all times in the upper trunk of a scraper chain conveyor, wherein possibly for mounting the scraper wings must only be pushed on from above onto the scraper-securing elements and the fixing screws and the screws must be tightened. It is particularly advantageous for the cooperation of the scraper with the vertical chain links if the bearing zones preferably embodied as circular arc- shaped cambers also extend over the front sides of a projection protruding downward at the head web between projection over a relatively large surface area, as a result of which a relatively large bearing face is achieved between the vertical chain links and the front sides of the scrapers and simultaneously a good angling capacity of the vertical chain links in the vertical direction is enabled. This vertical angling capacity is particularly necessary if the link chain with the connected scrapers runs around on a driven chain wheel. The projection is expediently provided centrally with the screw passage. As already explained further above, it is particularly advantageous if the scrapers have scraper-securing elements which can be inserted from below into the insertion pockets and have at their upper side limb beds for the limbs of the horizontal chain links and have at their transverse sides a projection which can be introduced into the grooves. The projection on the transverse sides of the scraper-securing element then secures this by positive locking in the grooves in the insides of the scraper wings or the outsides of the preferably present intermediate web, as a result of which the grooves are given a dual function, namely to bring about, on the one hand, a positive-locking closure between horizontal chain links and scrapers and, on the other hand, a positive-locking closure in the direction of travel of the link chain between the scraper-securing elements and the scrapers. Moreover, the projection can preferably comprise a vertical web with a preferably trapezoidal cross-section which correspondingly cooperates with grooves in the insides and outsides on the scraper which likewise have a trapezoidal cross-section and extend from a groove base to the surfaces of the insides or outsides on the scraper. It is particularly advantageous, in particular for the mounting of the scraper on the link chain, if the scraper-securing elements are provided in their base surface with a receiving recess for the screw head of a fixing screw. It is particularly expedient if the receiving recess forms a positive-locking anti-twist device for the screw head since then exclusively a mounting tool for the nut which can be screwed onto the shaft of the fixing screw must be placed from above without the fixing screw having to be fixed by a locknut. In order to tighten the nut, it is then sufficient to prevent a rotation of the scraper. The receiving recess can in particular be formed as a transverse slot which e.g. receives the screw head of a hammerhead screw as a fixing screw in a rotationally fixed manner. The width of the scraper-securing means can preferably substantially correspond to the minimum distance of the bearing zones for the vertical chain links on the front zones of the head web. Furthermore, the scraper- securing element can preferably be provided centrally between both entrainment projections with a raised portion on the sides of which limb beds for the limbs of the horizontal chain links are formed. The raised portion and/or the projection can be provided laterally with rounded portions for cooperation with the limbs of the chain links of the link chain, wherein the rounded portions then preferably run out flat towards the outside or inside. The raised portion and/or the projection can, in the case of the horizontal chain links according to the invention, enclose in inner eyelets of these chain links and lie on top of one another there in the mounting status of scrapers, horizontal chain link and scraper-securing element. The invention also relates to a scraper-securing element for securing a scraper on horizontal chain links of a link chain of a double center scraper chain conveyor which are inserted into insertion pockets on the scraper, wherein the base of the scraper-securing element is provided on its transverse sides with projections for engagement with grooves in the inside of the scraper wings and the outside of an intermediate web on the head web of a scraper. Further advantages and configurations of a scraper according to the invention including a scraper-securing device shall become apparent from the following description of a preferred exemplary embodiment shown in the drawing. In the drawing: Fig. 1 shows a top view, partially broken up, of a scraper connected to a link strand of a double center chain; Fig. 2 shows a sectional view along II-II in Fig. 1; Fig. 3 shows a longitudinal section, partially broken up, through both insertion pockets with inserted and secured horizontal chain links, partially broken up; Fig. 4 shows, in an exploded side view, an insertion pocket, two chain links and a scraper-securing element prior to mounting; Fig. 5 a view of the underside of a half of a scraper according to the invention; Fig. 6 shows a longitudinal section through a scraper according to the invention, partially broken up; Fig. 7 shows a view along VII-VII in Fig. 6 of a groove in the inside of the scraper wings; and Fig. 8 shows a chain strand of a link chain in which the scrapers according to the invention are preferably used. The scraper generally designated in the figures by 10 is formed for a relatively wide underground high- performance scraper chain conveyor in which a link chain 50 embodied as a double center chain rotates with two link chain strands 51 formed identically to one another for conveying the extraction material, in particular coal. In this case, scrapers 10 according to the invention are in each case connected at a distance from one another to horizontal chain links 52 which have chain fronts 53 with a straight front side 54 as is already easily apparent from Fig. 1. Link chain 51 without mounted scrapers is shown in a top view in Fig. 8 to which reference is made first. In each case two horizontal chain links 52 formed identically to one another with front parts 53 having straight front sides 54 are connected to one another by means of a vertical chain link 60, which vertical chain link 60 has a constant cross-sectional profile 61 around the full circumference. Cross-sectional profile 61 of vertical chain links 60 is, around the full circumference, provided on its outside with a flat section 62 and embodied on its inside facing an inner opening with a circular arc-shaped camber 63. Flat section 62 of cross-sectional profile 61 forms a transition in each case via bevels 64 into circular arc-shaped camber 63 and vertical chain links 60 which are generally relatively small engage with inner openings 55 of horizontal chain links 52. All horizontal chain links 52 have limbs 56 which connect front sections 53 embodied in a rectangular shape on the front side to one another, and limbs 56 are provided on their outside with a recess 57 in which, centrally between both front sections 53, an entrainment projection 58 protruding into recess 57 is formed with a trapezoidal cross-sectional profile which serves for improved scraper connection by positive- locking entrainment of the scrapers. Link chain 51 with approximately rectangular horizontal chain links 52 and flat vertical chain links 60 is particularly suitable for high-performance scraper chain conveyors since, on the one hand, horizontal chain links 52, during rotation around a chain wheel, are only subject to low surface pressures with the pockets of the chain wheel and, on the other hand, the articulated play between vertical chain links 60 and horizontal chain links 52 is also improved in particular by bevels 64, as a result of which the overall wear characteristics of link chain 51 are minimized. The scraper chain shown in Fig. 8 forms the subject matter of a separate application with the same filing date, to which disclosure reference is made for completion of the present disclosure. The structure of scrapers 10 embodied for connection to horizontal chain links 52 will now be explained with additional reference to Fig. 2 to 7. Each scraper 10 has at its lateral ends two scraper wings 1 which are integrally connected to one another by means of a head web 2. Scraper 10 according to the invention preferably comprises a cast part and front sides 3 of scraper wings 1, which reach down to underside 8 of scraper 10, have convex recesses 4 in order to improve the conveying capacity of scrapers 1 according to the invention in operational use. The connection of scrapers 10 to horizontal chain links 52 of double center chain 50 is performed into insertion pockets 5 below head web 2. Both insertion pockets 5 lying next to one another are herein divided from one another by means of a solid, in cross-section trapezoidal intermediate web 6 whose underside 7 ends flush with underside 8 of scraper wings 1, as is particularly apparent from Fig. 6. In order to reduce the weight of scrapers 10, both scraper wings 1 are provided with cavities 9 open to underside 8, which cavities 9 are already preferably provided during original shaping of scraper 10. Each scraper wing 1 has, below head web 2, an inside 11 which forms one of both lateral delimitations for insertion pockets 5. The other lateral delimitation of each insertion pocket 5 is formed by respective outsides 12 of central web 6. Insides and outsides 11, 12 diverge slightly, as a result of which the width of insertion pockets 5 increases towards underside 7 or 8. For positive- locking anchoring of horizontal chain links 52 having entrainment projections 58 in insertion pockets 5, grooves 13 and 14 are formed both in insides 11 of scraper wings 1 and in outsides 12 of central web 6, grooves 13 and 14 protruding upwards substantially from underside 8 of scraper 10 to underside 2' of head web 2. Grooves 13 provided according to the invention in insides 11 and grooves 14 in the outsides of intermediate web 6 are particularly apparent from Fig. 1, 4, 5 and 7. Since grooves 13 and 14 run over the entire height of insertion pockets 5, they extend both across a region in which a scraper-securing element 40 is received in each insertion pocket 5 as well as across the region directly below underside 2' of head web 2 in which limb beds 15 for limbs 56 of horizontal chain links 52 are formed. Fig. 3 and 4 show herein the status after and before mounting of horizontal chain link 52 and of scraper-securing element 40 in insertion pockets 5. Fig. 3 illustrates that entrainment projections 58 on horizontal limbs 56 extend to groove base 13' or 14' of respective grooves 13, 14 such that the scrapers are therefore fixed in a positive-locking manner in the direction of movement of the link chain on horizontal chain links 52. Fig. 1 shows the positive-locking engagement of entrainment projections 58 with, grooves 13 and 14. Figures 3 and 4 furthermore illustrate that, between limb beds 15 of each insertion pocket 5, a conical projection 17 protruding downward across web head 2 is formed, which projection 17 has laterally trough-shaped recesses 18 as a part of limb beds 15. The front side of the projection which coincides with front side 19 of head web 2 is provided with trough-shaped bearing zones 20 for chain fronts 65 of vertical chain links 60. Therein, in each case, a bearing zone 20 simultaneously forms a division for both limb beds 15 of an insertion pocket 5 lying next to one another. The relatively flat progression, which is semicircularly cambered across the height of scrapers 10, of the surface of bearing zones 20 on which the fronts of vertical chain links 60 flattened on the outside bear is particularly clearly apparent from Fig. 2 and 5. Centrally between both bearing zones 20 which lie opposite one another, each insertion pocket 5 is assigned a screw passage 21 passing perpendicularly through head web 2 which, due to projection 17, reaches relatively far into insertion pocket 5. On upper side 2' of web head 2, each screw passage 21 opens into a recess 22 which serves to receive a fixing nut 41, as Fig. 1 and 2 in particular show. Herein, an introduction inclination 23 for a detachment tool opens into each recess 22 in order to detach a potentially rusted-tight nut 41 from shaft 43' of a fixing screw 43 which fixes scraper-securing element 40 and horizontal chain link 52 in insertion pocket 5. Fixing screw 43 is embodied as a cap screw, in particular a hammerhead screw, whose head 44 engages in a positive-locking manner with a transverse slot 45 on underside 4 6 of base 47 of scraper-securing element 40 in a rotationally fixed manner, while shaft 43' of fixing screw 43 passes through a bore in scraper-securing element 40 and through screw passage 21 in head web 2, in order then to be able to screw fixing nut 41 onto shaft 43'. As is in turn particularly apparent from Fig. 3 and 4, base 47 of scraper-securing element 40 has, at its upper side, a raised section 48 and, at its transverse sides, in each case a projection 49. Both projections 49 are substantially adapted in terms of cross-section and width to entrainment projections 58 of horizontal chain links 52 and to the groove geometry of grooves 13, 14 so that, in the mounted state, projections 49 can likewise enclose on the transverse sides of scraper-securing element 40 into grooves 13 and 14 on both sides of insertion pockets 5 in order to support inserted horizontal chain link 52 downward over its entire width and prevent tilting movements between horizontal chain link 52 and scraper 10. Raised section 48 cooperates, in the mounted state of scraper 2, chain link 52 and scraper-securing element 40, with projection 17 on the underside of head web 2 and both engage with inner openings 55 of horizontal chain links 52, as Fig. 2 and 3 in particular illustrate. At the same time, limb beds 30 whose geometry is substantially adjusted to the geometry of limb beds 15 on the underside of head web 2 are formed on the upper side of scraper-securing elements 40 together with trough- shaped recesses on both sides of raised section 48. All limb beds 15 and 30 run out in each case flat to grooves 13, 14 or to projections 49 in order to achieve a good interaction and a large-area bearing with limbs 56 of horizontal chain links 52. The mounting of scrapers 20 on horizontal chain links 52 of the double center chain is particularly facilitated by the positive-locking fixing of screw heads 44 of fixing screws 43 since a tool for tightening or detaching nuts 41 must be put in place exclusively from above without the fixing screw having to be fixed by a locknut from the underside. Mounting can in particular also be performed with an electrical screwdriver. Numerous modifications which should fall within the scope of protection of the attached claims are apparent to the person skilled in the art from the above description. An exemplary embodiment is not represented in which only one scraper-securing element is used to secure both horizontal chain links in the insertion pockets. In the case of such an exemplary embodiment, the central web would only reach to the lower height of the limb beds. An exemplary embodiment is also not shown of the use of a scraper having only one insertion pocket on a single center chain. Patent claims 1. Scraper for link chains of scraper chain conveyors, in particular double center scraper chain conveyors, comprising a one-part scraper body with a head web connecting two lateral scraper wings and at least one insertion pocket between the scraper wings for insertion of a horizontal chain link of the link chain and securing the scraper on an inserted horizontal chain link by means of a detachable scraper- securing element which can be connected to the head web, wherein the insides facing one another of the scraper wings are provided below the head web with a groove, the head web has on both front sides a bearing zone for the fronts of vertical chain links of the link chain and on its underside on both sides of the bearing zone a limb bed for limbs of the horizontal chain links, characterized in that the grooves (13) in the insides (11) extend over the height of the limb beds (15) up to the head web (2) and form receivers for entrainment projections on the outer faces of the limbs of the horizontal chain links. 2. Scraper as claimed in claim 1, characterized in that the grooves (13) in the insides (11) reach up to the underside (8) of the scraper wings (1). 3. Scraper as claimed in claim 1 or 2, characterized in that an intermediate web (6) is formed at the head web (2) between both scraper wings (1), which intermediate web (6) in each case delimits an insertion pocket (5) at one side with its outsides (12) which face the insides and has a groove (14) in the outside (12), which groove (14) extends over the height of the limb beds (15) up to the head web (2) and forms a receiver for an entrainment projection on the outer surface of the limbs of the horizontal chain links. 4. Scraper as claimed in claim 3, characterized in that the grooves (14) reach in the outsides (12) up to the underside (7) of the central web (6) . 5. Scraper as claimed in one of claims 1 to 4, characterized in that the limb beds (15) are formed for insertion of horizontal chain links which have straight front sides on the front sections and recesses provided with entrainment projections in the outsides of the limbs. 6. Scraper as claimed in one of claims 1 to 5, characterized in that the bearing zones (20) are formed for supporting of vertical chain links of a link chain, whose wire cross-section is constant around the full circumference and is provided on the outside with a flat section. 7. Scraper as claimed in one of claims 1 to 6, characterized in that the limb beds (15) comprise surfaces which run out flat towards the insides (11) and/or outsides (12). 8. Scraper as claimed in one of claims 1 to 7, characterized in that a screw passage (21) for the shaft of a fixing screw and/or a recess (22) for insertion of a nut which cooperates with the fixing screw is/are formed in the head web (2) between both bearing zones (20). 9. Scraper as claimed in claim 8, characterized in that an introduction inclination (23) for a detachment tool opens into each recess (22). 10. Scraper as claimed in one of claims 1 to 9, characterized in that the bearing zones (20) extend over the front sides of a projection (17) protruding downward at the head web (2) between the limb beds (15). 11. Scraper as claimed in claim 10, characterized in that the projection (17) is provided centrally with the screw passage (21) and/or is provided laterally with rounded sections for cooperation with limbs of the horizontal chain links of the link chain. 12. Scraper as claimed in one of claims 1 to 11, characterized in that the grooves (13, 14) have a trapezoidal cross-section and/or the scraper wings (1) are provided on their underside (8) with a cavity (9). 13. Scraper as claimed in one of claims 1 to 12, characterized in that the scraper-securing elements (40) which can be inserted from below into the insertion pockets have at their upper side limb beds (30) for the limbs of the horizontal chain links and have at their transverse sides a projection (49) which can be introduced into the grooves (13, 14). 14. Scraper-securing element for securing a scraper as claimed in one of claims 1 to 13 on a horizontal chain link, which is inserted in an insertion pocket on the scraper, of a link chain of a double center scraper chain conveyor, characterized in that the base (47) of the scraper-securing element (40) is provided on its transverse sides with a projection (49) for engagement with grooves in insides of the scraper wings and outsides of an intermediate web on the scraper. 15. Scraper as claimed in claim 13 or scraper- securing element as claimed in claim 14, characterized in that the scraper-securing elements (40) are provided in the base surface (46) of the base body (47) with a receiving recess (45) for the screw head of a fixing screw. 16. Scraper or scraper-securing element as claimed in claim 15, characterized in that the receiving recess (45) forms a positive-locking anti-twist device for the screw head, wherein the receiving recess is preferably formed as a transverse slot for rotationally fixed engagement of a screw head of a hammerhead screw as a fixing screw. 17. Scraper or scraper-securing element as claimed in one of claims 13 to 16, characterized in that the scraper-securing element (40) is provided centrally between both projections (49) with a raised portion (48), on both sides of which limb beds (30) for the limbs of the horizontal chain links are formed. 18. Scraper or scraper-securing element as claimed in one of claims 13 to 17, characterized in that the raised portion (30) is provided laterally with rounded portions for cooperation with limbs of the horizontal chain links of the link chain. 19. Scraper or scraper-securing element as claimed in one of claims 13 to 18, characterized in that the projection (49) comprises a vertical web with a preferably trapezoidal cross-section. The invention relates to scrapers 10 for link chains of in particular double center scraper chain conveyors, comprising a one-part scraper body with a head web 2 connecting two lateral scraper wings 1 and at least one insertion pocket 5 for insertion of a horizontal chain link 52 of the link chain and securing scraper 10 by means of a detachable scraper-securing element 40. In order to improve the entrainment of scrapers 10 connected to the horizontal chain links and to be able to use the scrapers even with novel link chains, grooves extend in insides 11 of scraper wings 1 and outsides of an intermediate web 6 over the height of limb beds 15 up to head web 2 and form receivers for entrainment projections 58 on the outer surfaces of limbs 56 of horizontal chain links 52. The invention also relates to scraper-securing element 40.

Full Text

Scrapers for link chains of scraper chain conveyors and
scraper-securing element therefor
The invention relates to scrapers for link chains of
scraper chain conveyors, in particular double center
scraper chain conveyors, comprising a one-part scraper
body with a head web connecting two lateral scraper
wings and at least one insertion pocket between the
scraper wings for insertion of a horizontal chain link
of the link chain and securing the scraper on an
inserted horizontal chain link by means of a detachable
scraper-securing element which can be connected to the
head web, wherein the insides facing one another of the
scraper wings are provided below the head web with a
groove, the head web has on both front sides bearing
zones for the fronts of vertical chain links of the
link chain and on its underside on both sides of the
bearing zones a limb bed for limbs of the horizontal
chain links of the link chain. The invention also
relates to the scraper-securing element provided for
these scrapers.
A generic scraper is known from DE 102 25 341 Cl. The
known scraper can be fixed to link chains whose
horizontal and vertical chain links in each case
comprise oval ring eyelet members with round chain
fronts. Fixing of the scraper on the horizontal chain
links of these link chains is performed by means of a
securing strap which runs in one piece between both
insides of the scraper wings and clamps the horizontal
chain links from below against the underside of the
head web. The securing of the strap on the head web
against detachment is performed by means of dowel pins
which can be inserted into through bores, which dowel
pins penetrate through the pins which are formed on the
upper side of the strap and engage with corresponding
locking recesses in the head web.

DE 197 01 579 Al discloses a link chain whose front
sections have straight front zones and whose vertical
chain links have a wire cross-section which is constant
around the full circumference and is provided on the
outer periphery with a flat section. A link chain
formed in this manner can also be used in high-
performance scraper chain conveyors and the chain links
are subject to less wear than those of a standard
scraper chain with vertical and horizontal round wire
chain links. The scrapers known from DE 197 01 579 Al
have, for connection to this link chain, a head web on
whose underside a pin projects onto which a horizontal
web chain link having a transverse web can be pushed
and can be fixed by means of separate locking rails. In
one particular configuration of scraper and horizontal
chain link, the passages in the transverse webs can
also be formed substantially T-shaped. This
configuration enables a positive-locking closure of pin
and transverse web, wherein the chain links can be
mounted at the pins only in a defined swivel position.
The scrapers provided in DE 197 01 579 Al require
special horizontal web chain links with transverse web
and are also not suitable for withstanding the large
forces which occur with a high-performance conveyor.
The object of the invention is to create a scraper in
particular for a link chain with special chain links
which has a sufficiently long lifetime and is reliably
entrained even in the case of large width and thus high
potential conveying power and with low wear by the
horizontal chain links of a link chain.
These and further objects are achieved according to the
invention in that the grooves in the insides of the
scraper wings extend over the height of the limb beds
up to the head web and form receivers for entrainment
projections on the outer faces of the limbs of the
horizontal chain links. The scrapers according to the
invention are particularly suitable for a link chain

which the applicant has developed together with the
scrapers and which is the subject matter of a parallel
application with the same filing date. In this link
chain, entrainment projections which can cooperate with
the receivers formed by the grooves on the scrapers by
positive fit are formed on the outer surfaces of the
limbs of the horizontal chain links in order, as a
result, to move the scrapers evenly and well-supported
in the conveying direction preferably in a pushing
manner. In order to achieve this, the grooves in the
scraper wings extend on both sides of the limb beds up
to the head web such that particularly reliable, even
and also low-wear entrainment of the scrapers is
achieved in the running direction of the link chain due
to the engagement of the entrainment projections with
the grooves in the scraper.
In the case of the particularly preferred
configuration, the grooves in the insides extend up to
the underside of the scraper wings. This not only
enables precise placing and insertion of the horizontal
chain links, but rather the grooves can, as is
explained further below, also fix and hold a scraper-
securing element by positive fit in the direction of
movement.
The invention can in principle also be used in the case
of scrapers for single center scraper chain conveyors
in which only two grooves are formed in the insides of
the scraper wings and a scraper-securing element
extends between these two grooves in the insides of the
scraper wings. However, the preferred configuration of
the scrapers has an intermediate web located at the
head web between both scraper wings, which intermediate
web in each case delimits an insertion pocket at one
side with its outsides which face the insides and also
has in each case a groove in the outside, which groove
extends over the height of the limb beds up to the head
web and forms a receiver for an entrainment projection

on the outer surface of the limbs of the horizontal
chain links. A corresponding scraper then has two
insertion pockets lying next to one another for
horizontal chain links of the link chain strands lying
next to one another of a double center chain. Each
horizontal chain link inserted into an insertion pocket
then engages with its entrainment projections at one
side of the chain bed with a groove on the inside of
one of the scraper wings and on the other side of the
chain bed with a groove in the outside of the
intermediate web. According to one potential
configuration, a scraper-securing element could then be
provided which furthermore extends exclusively between
both grooves in the insides and, as a one-part scraper-
securing element, simultaneously secures both inserted
horizontal chain links on the scraper against falling
out. Nevertheless, this particularly preferred
configuration provides that the grooves also reach in
the outsides up to the underside of the central web,
wherein the underside of the central web is then formed
substantially flush with the undersides of the scraper
wings in order to improve the bearing of the scrapers
on the conveyor base of a conveyor. Two insertion
pockets are therefore present, into which in each case
a horizontal chain link with an associated scraper-
securing element can be inserted and secured against
falling out.
In the case of the particularly preferred
configuration, the limb beds are formed for insertion
of horizontal chain links which have straight front
zones on the front sections and recesses provided with
entrainment projections in the outer surfaces of the
limbs connecting the front sections to one another.
Moreover, the bearing zones are preferably formed at
the head web of the scraper for supporting of vertical
chain links of a link chain, whose wire cross-section
is constant around the full circumference and is
provided on the outside with a flat section and on the

inside preferably with a circular camber, wherein
bevels are preferably formed at the transition of the
flat section to the circular arc. It is particularly
advantageous for receiving of the horizontal chain
links of a corresponding scraper link chain if the limb
beds comprise surfaces which run out flat towards the
insides of the scraper wings and/or the outsides of the
intermediate web, on which surfaces the substantially
rectangular horizontal chain links can then be
particularly well supported.
The fixing of the scraper-securing element on the
scraper is preferably performed by means of a fixing
screw and a nut which cooperates therewith. To this
end, it is particularly advantageous if a screw passage
for the shaft of the fixing screw and/or a recess for
insertion of a nut which cooperates with the fixing
screw is/are formed in the head web between both
bearing zones. It is particularly advantageous if an
introduction inclination for a detachment tool opens
into each recess in order to be able to detach a
potentially rusted-tight nut from the shaft of the
fixing screw even after many hours of operation. In
this case, the detachment or tightening of the nut can
be performed particularly advantageously from above and
thus with easy access at all times in the upper trunk
of a scraper chain conveyor, wherein possibly for
mounting the scraper wings must only be pushed on from
above onto the scraper-securing elements and the fixing
screws and the screws must be tightened.
It is particularly advantageous for the cooperation of
the scraper with the vertical chain links if the
bearing zones preferably embodied as circular arc-
shaped cambers also extend over the front sides of a
projection protruding downward at the head web between

projection over a relatively large surface area, as a
result of which a relatively large bearing face is
achieved between the vertical chain links and the front
sides of the scrapers and simultaneously a good angling
capacity of the vertical chain links in the vertical
direction is enabled. This vertical angling capacity is
particularly necessary if the link chain with the
connected scrapers runs around on a driven chain wheel.
The projection is expediently provided centrally with
the screw passage.
As already explained further above, it is particularly
advantageous if the scrapers have scraper-securing
elements which can be inserted from below into the
insertion pockets and have at their upper side limb
beds for the limbs of the horizontal chain links and
have at their transverse sides a projection which can
be introduced into the grooves. The projection on the
transverse sides of the scraper-securing element then
secures this by positive locking in the grooves in the
insides of the scraper wings or the outsides of the
preferably present intermediate web, as a result of
which the grooves are given a dual function, namely to
bring about, on the one hand, a positive-locking
closure between horizontal chain links and scrapers
and, on the other hand, a positive-locking closure in
the direction of travel of the link chain between the
scraper-securing elements and the scrapers. Moreover,
the projection can preferably comprise a vertical web
with a preferably trapezoidal cross-section which
correspondingly cooperates with grooves in the insides
and outsides on the scraper which likewise have a
trapezoidal cross-section and extend from a groove base
to the surfaces of the insides or outsides on the
scraper.
It is particularly advantageous, in particular for the
mounting of the scraper on the link chain, if the
scraper-securing elements are provided in their base

surface with a receiving recess for the screw head of a
fixing screw. It is particularly expedient if the
receiving recess forms a positive-locking anti-twist
device for the screw head since then exclusively a
mounting tool for the nut which can be screwed onto the
shaft of the fixing screw must be placed from above
without the fixing screw having to be fixed by a
locknut. In order to tighten the nut, it is then
sufficient to prevent a rotation of the scraper. The
receiving recess can in particular be formed as a
transverse slot which e.g. receives the screw head of a
hammerhead screw as a fixing screw in a rotationally
fixed manner.
The width of the scraper-securing means can preferably
substantially correspond to the minimum distance of the
bearing zones for the vertical chain links on the front
zones of the head web. Furthermore, the scraper-
securing element can preferably be provided centrally
between both entrainment projections with a raised
portion on the sides of which limb beds for the limbs
of the horizontal chain links are formed. The raised
portion and/or the projection can be provided laterally
with rounded portions for cooperation with the limbs of
the chain links of the link chain, wherein the rounded
portions then preferably run out flat towards the
outside or inside. The raised portion and/or the
projection can, in the case of the horizontal chain
links according to the invention, enclose in inner
eyelets of these chain links and lie on top of one
another there in the mounting status of scrapers,
horizontal chain link and scraper-securing element.
The invention also relates to a scraper-securing
element for securing a scraper on horizontal chain
links of a link chain of a double center scraper chain
conveyor which are inserted into insertion pockets on
the scraper, wherein the base of the scraper-securing
element is provided on its transverse sides with

projections for engagement with grooves in the inside
of the scraper wings and the outside of an intermediate
web on the head web of a scraper.
Further advantages and configurations of a scraper
according to the invention including a scraper-securing
device shall become apparent from the following
description of a preferred exemplary embodiment shown
in the drawing. In the drawing:
Fig. 1 shows a top view, partially broken up,
of a scraper connected to a link strand
of a double center chain;
Fig. 2 shows a sectional view along II-II in
Fig. 1;
Fig. 3 shows a longitudinal section, partially
broken up, through both insertion
pockets with inserted and secured
horizontal chain links, partially broken
up;
Fig. 4 shows, in an exploded side view, an
insertion pocket, two chain links and a
scraper-securing element prior to
mounting;
Fig. 5 a view of the underside of a half of a
scraper according to the invention;
Fig. 6 shows a longitudinal section through a
scraper according to the invention,
partially broken up;
Fig. 7 shows a view along VII-VII in Fig. 6 of
a groove in the inside of the scraper
wings; and

Fig. 8 shows a chain strand of a link chain in
which the scrapers according to the
invention are preferably used.
The scraper generally designated in the figures by 10
is formed for a relatively wide underground high-
performance scraper chain conveyor in which a link
chain 50 embodied as a double center chain rotates with
two link chain strands 51 formed identically to one
another for conveying the extraction material, in
particular coal. In this case, scrapers 10 according to
the invention are in each case connected at a distance
from one another to horizontal chain links 52 which
have chain fronts 53 with a straight front side 54 as
is already easily apparent from Fig. 1.
Link chain 51 without mounted scrapers is shown in a
top view in Fig. 8 to which reference is made first. In
each case two horizontal chain links 52 formed
identically to one another with front parts 53 having
straight front sides 54 are connected to one another by
means of a vertical chain link 60, which vertical chain
link 60 has a constant cross-sectional profile 61
around the full circumference. Cross-sectional profile
61 of vertical chain links 60 is, around the full
circumference, provided on its outside with a flat
section 62 and embodied on its inside facing an inner
opening with a circular arc-shaped camber 63. Flat
section 62 of cross-sectional profile 61 forms a
transition in each case via bevels 64 into circular
arc-shaped camber 63 and vertical chain links 60 which
are generally relatively small engage with inner
openings 55 of horizontal chain links 52. All
horizontal chain links 52 have limbs 56 which connect
front sections 53 embodied in a rectangular shape on
the front side to one another, and limbs 56 are
provided on their outside with a recess 57 in which,
centrally between both front sections 53, an
entrainment projection 58 protruding into recess 57 is

formed with a trapezoidal cross-sectional profile which
serves for improved scraper connection by positive-
locking entrainment of the scrapers. Link chain 51 with
approximately rectangular horizontal chain links 52 and
flat vertical chain links 60 is particularly suitable
for high-performance scraper chain conveyors since, on
the one hand, horizontal chain links 52, during
rotation around a chain wheel, are only subject to low
surface pressures with the pockets of the chain wheel
and, on the other hand, the articulated play between
vertical chain links 60 and horizontal chain links 52
is also improved in particular by bevels 64, as a
result of which the overall wear characteristics of
link chain 51 are minimized. The scraper chain shown in
Fig. 8 forms the subject matter of a separate
application with the same filing date, to which
disclosure reference is made for completion of the
present disclosure.
The structure of scrapers 10 embodied for connection to
horizontal chain links 52 will now be explained with
additional reference to Fig. 2 to 7. Each scraper 10
has at its lateral ends two scraper wings 1 which are
integrally connected to one another by means of a head
web 2. Scraper 10 according to the invention preferably
comprises a cast part and front sides 3 of scraper
wings 1, which reach down to underside 8 of scraper 10,
have convex recesses 4 in order to improve the
conveying capacity of scrapers 1 according to the
invention in operational use. The connection of
scrapers 10 to horizontal chain links 52 of double
center chain 50 is performed into insertion pockets 5
below head web 2. Both insertion pockets 5 lying next
to one another are herein divided from one another by
means of a solid, in cross-section trapezoidal
intermediate web 6 whose underside 7 ends flush with
underside 8 of scraper wings 1, as is particularly
apparent from Fig. 6. In order to reduce the weight of
scrapers 10, both scraper wings 1 are provided with

cavities 9 open to underside 8, which cavities 9 are
already preferably provided during original shaping of
scraper 10. Each scraper wing 1 has, below head web 2,
an inside 11 which forms one of both lateral
delimitations for insertion pockets 5. The other
lateral delimitation of each insertion pocket 5 is
formed by respective outsides 12 of central web 6.
Insides and outsides 11, 12 diverge slightly, as a
result of which the width of insertion pockets 5
increases towards underside 7 or 8. For positive-
locking anchoring of horizontal chain links 52 having
entrainment projections 58 in insertion pockets 5,
grooves 13 and 14 are formed both in insides 11 of
scraper wings 1 and in outsides 12 of central web 6,
grooves 13 and 14 protruding upwards substantially from
underside 8 of scraper 10 to underside 2' of head web
2. Grooves 13 provided according to the invention in
insides 11 and grooves 14 in the outsides of
intermediate web 6 are particularly apparent from Fig.
1, 4, 5 and 7. Since grooves 13 and 14 run over the
entire height of insertion pockets 5, they extend both
across a region in which a scraper-securing element 40
is received in each insertion pocket 5 as well as
across the region directly below underside 2' of head
web 2 in which limb beds 15 for limbs 56 of horizontal
chain links 52 are formed. Fig. 3 and 4 show herein the
status after and before mounting of horizontal chain
link 52 and of scraper-securing element 40 in insertion
pockets 5. Fig. 3 illustrates that entrainment
projections 58 on horizontal limbs 56 extend to groove
base 13' or 14' of respective grooves 13, 14 such that
the scrapers are therefore fixed in a positive-locking
manner in the direction of movement of the link chain
on horizontal chain links 52. Fig. 1 shows the
positive-locking engagement of entrainment projections
58 with, grooves 13 and 14. Figures 3 and 4 furthermore
illustrate that, between limb beds 15 of each insertion
pocket 5, a conical projection 17 protruding downward
across web head 2 is formed, which projection 17 has

laterally trough-shaped recesses 18 as a part of limb
beds 15. The front side of the projection which
coincides with front side 19 of head web 2 is provided
with trough-shaped bearing zones 20 for chain fronts 65
of vertical chain links 60. Therein, in each case, a
bearing zone 20 simultaneously forms a division for
both limb beds 15 of an insertion pocket 5 lying next
to one another. The relatively flat progression, which
is semicircularly cambered across the height of
scrapers 10, of the surface of bearing zones 20 on
which the fronts of vertical chain links 60 flattened
on the outside bear is particularly clearly apparent
from Fig. 2 and 5.
Centrally between both bearing zones 20 which lie
opposite one another, each insertion pocket 5 is
assigned a screw passage 21 passing perpendicularly
through head web 2 which, due to projection 17, reaches
relatively far into insertion pocket 5. On upper side
2' of web head 2, each screw passage 21 opens into a
recess 22 which serves to receive a fixing nut 41, as
Fig. 1 and 2 in particular show. Herein, an
introduction inclination 23 for a detachment tool opens
into each recess 22 in order to detach a potentially
rusted-tight nut 41 from shaft 43' of a fixing screw 43
which fixes scraper-securing element 40 and horizontal
chain link 52 in insertion pocket 5. Fixing screw 43 is
embodied as a cap screw, in particular a hammerhead
screw, whose head 44 engages in a positive-locking
manner with a transverse slot 45 on underside 4 6 of
base 47 of scraper-securing element 40 in a
rotationally fixed manner, while shaft 43' of fixing
screw 43 passes through a bore in scraper-securing
element 40 and through screw passage 21 in head web 2,
in order then to be able to screw fixing nut 41 onto
shaft 43'.
As is in turn particularly apparent from Fig. 3 and 4,
base 47 of scraper-securing element 40 has, at its

upper side, a raised section 48 and, at its transverse
sides, in each case a projection 49. Both projections
49 are substantially adapted in terms of cross-section
and width to entrainment projections 58 of horizontal
chain links 52 and to the groove geometry of grooves
13, 14 so that, in the mounted state, projections 49
can likewise enclose on the transverse sides of
scraper-securing element 40 into grooves 13 and 14 on
both sides of insertion pockets 5 in order to support
inserted horizontal chain link 52 downward over its
entire width and prevent tilting movements between
horizontal chain link 52 and scraper 10. Raised section
48 cooperates, in the mounted state of scraper 2, chain
link 52 and scraper-securing element 40, with
projection 17 on the underside of head web 2 and both
engage with inner openings 55 of horizontal chain links
52, as Fig. 2 and 3 in particular illustrate. At the
same time, limb beds 30 whose geometry is substantially
adjusted to the geometry of limb beds 15 on the
underside of head web 2 are formed on the upper side of
scraper-securing elements 40 together with trough-
shaped recesses on both sides of raised section 48. All
limb beds 15 and 30 run out in each case flat to
grooves 13, 14 or to projections 49 in order to achieve
a good interaction and a large-area bearing with limbs
56 of horizontal chain links 52.
The mounting of scrapers 20 on horizontal chain links
52 of the double center chain is particularly
facilitated by the positive-locking fixing of screw
heads 44 of fixing screws 43 since a tool for
tightening or detaching nuts 41 must be put in place
exclusively from above without the fixing screw having
to be fixed by a locknut from the underside. Mounting
can in particular also be performed with an electrical
screwdriver.
Numerous modifications which should fall within the
scope of protection of the attached claims are apparent

to the person skilled in the art from the above
description. An exemplary embodiment is not represented
in which only one scraper-securing element is used to
secure both horizontal chain links in the insertion
pockets. In the case of such an exemplary embodiment,
the central web would only reach to the lower height of
the limb beds. An exemplary embodiment is also not
shown of the use of a scraper having only one insertion
pocket on a single center chain.

Patent claims
1. Scraper for link chains of scraper chain
conveyors, in particular double center scraper chain
conveyors, comprising a one-part scraper body with a
head web connecting two lateral scraper wings and at
least one insertion pocket between the scraper wings
for insertion of a horizontal chain link of the link
chain and securing the scraper on an inserted
horizontal chain link by means of a detachable scraper-
securing element which can be connected to the head
web, wherein the insides facing one another of the
scraper wings are provided below the head web with a
groove, the head web has on both front sides a bearing
zone for the fronts of vertical chain links of the link
chain and on its underside on both sides of the bearing
zone a limb bed for limbs of the horizontal chain
links, characterized in that the grooves (13) in the
insides (11) extend over the height of the limb beds
(15) up to the head web (2) and form receivers for
entrainment projections on the outer faces of the limbs
of the horizontal chain links.
2. Scraper as claimed in claim 1, characterized in
that the grooves (13) in the insides (11) reach up to
the underside (8) of the scraper wings (1).
3. Scraper as claimed in claim 1 or 2,
characterized in that an intermediate web (6) is formed
at the head web (2) between both scraper wings (1),
which intermediate web (6) in each case delimits an
insertion pocket (5) at one side with its outsides (12)
which face the insides and has a groove (14) in the
outside (12), which groove (14) extends over the height
of the limb beds (15) up to the head web (2) and forms
a receiver for an entrainment projection on the outer
surface of the limbs of the horizontal chain links.

4. Scraper as claimed in claim 3, characterized in
that the grooves (14) reach in the outsides (12) up to
the underside (7) of the central web (6) .
5. Scraper as claimed in one of claims 1 to 4,
characterized in that the limb beds (15) are formed for
insertion of horizontal chain links which have straight
front sides on the front sections and recesses provided
with entrainment projections in the outsides of the
limbs.
6. Scraper as claimed in one of claims 1 to 5,
characterized in that the bearing zones (20) are formed
for supporting of vertical chain links of a link chain,
whose wire cross-section is constant around the full
circumference and is provided on the outside with a
flat section.
7. Scraper as claimed in one of claims 1 to 6,
characterized in that the limb beds (15) comprise
surfaces which run out flat towards the insides (11)
and/or outsides (12).
8. Scraper as claimed in one of claims 1 to 7,
characterized in that a screw passage (21) for the
shaft of a fixing screw and/or a recess (22) for
insertion of a nut which cooperates with the fixing
screw is/are formed in the head web (2) between both
bearing zones (20).
9. Scraper as claimed in claim 8, characterized in
that an introduction inclination (23) for a detachment
tool opens into each recess (22).
10. Scraper as claimed in one of claims 1 to 9,
characterized in that the bearing zones (20) extend
over the front sides of a projection (17) protruding
downward at the head web (2) between the limb beds
(15).

11. Scraper as claimed in claim 10, characterized
in that the projection (17) is provided centrally with
the screw passage (21) and/or is provided laterally
with rounded sections for cooperation with limbs of the
horizontal chain links of the link chain.
12. Scraper as claimed in one of claims 1 to 11,
characterized in that the grooves (13, 14) have a
trapezoidal cross-section and/or the scraper wings (1)
are provided on their underside (8) with a cavity (9).
13. Scraper as claimed in one of claims 1 to 12,
characterized in that the scraper-securing elements
(40) which can be inserted from below into the
insertion pockets have at their upper side limb beds
(30) for the limbs of the horizontal chain links and
have at their transverse sides a projection (49) which
can be introduced into the grooves (13, 14).
14. Scraper-securing element for securing a scraper
as claimed in one of claims 1 to 13 on a horizontal
chain link, which is inserted in an insertion pocket on
the scraper, of a link chain of a double center scraper
chain conveyor, characterized in that the base (47) of
the scraper-securing element (40) is provided on its
transverse sides with a projection (49) for engagement
with grooves in insides of the scraper wings and
outsides of an intermediate web on the scraper.
15. Scraper as claimed in claim 13 or scraper-
securing element as claimed in claim 14, characterized
in that the scraper-securing elements (40) are provided
in the base surface (46) of the base body (47) with a
receiving recess (45) for the screw head of a fixing
screw.
16. Scraper or scraper-securing element as claimed
in claim 15, characterized in that the receiving recess

(45) forms a positive-locking anti-twist device for the
screw head, wherein the receiving recess is preferably
formed as a transverse slot for rotationally fixed
engagement of a screw head of a hammerhead screw as a
fixing screw.
17. Scraper or scraper-securing element as claimed
in one of claims 13 to 16, characterized in that the
scraper-securing element (40) is provided centrally
between both projections (49) with a raised portion
(48), on both sides of which limb beds (30) for the
limbs of the horizontal chain links are formed.
18. Scraper or scraper-securing element as claimed
in one of claims 13 to 17, characterized in that the
raised portion (30) is provided laterally with rounded
portions for cooperation with limbs of the horizontal
chain links of the link chain.
19. Scraper or scraper-securing element as claimed
in one of claims 13 to 18, characterized in that the
projection (49) comprises a vertical web with a
preferably trapezoidal cross-section.

The invention relates to scrapers 10 for link chains of in particular double center scraper chain conveyors, comprising a one-part scraper body with a head web 2 connecting two lateral scraper wings 1 and at least one insertion pocket 5 for insertion of a horizontal chain
link 52 of the link chain and securing scraper 10 by means of a detachable scraper-securing element 40. In order to improve the entrainment of scrapers 10 connected to the horizontal chain links and to be able to use the scrapers even with novel link chains, grooves extend in insides 11 of scraper wings 1 and outsides of an intermediate web 6 over the height of limb beds 15 up to head web 2 and form receivers for
entrainment projections 58 on the outer surfaces of limbs 56 of horizontal chain links 52. The invention also relates to scraper-securing element 40.

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=LJUQE2ChamLgkttEap+4Og==&loc=wDBSZCsAt7zoiVrqcFJsRw==

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Patent Number

270782

Indian Patent Application Number

3748/KOLNP/2008

PG Journal Number

04/2016

Publication Date

22-Jan-2016

Grant Date

19-Jan-2016

Date of Filing

12-Sep-2008

Name of Patentee

CATERPILLAR GLOBAL MINING EUROPE GMBH

Applicant Address

INDUSTRIESTRASSE 1, D-44535 LUNEN

Inventors:

#	Inventor's Name	Inventor's Address
1	HANS MEYA	THUNEN 34, D-59368 WERNE
2	GERHARD MERTEN	AM KNICK 8B, D-44534 LUNEN

PCT International Classification Number

B65G 19/10

PCT International Application Number

PCT/EP2006/002735

PCT International Filing date

2006-03-24

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA