Title of Invention

AN IMPROVED ANTI-BURGLAR SCREW BOLT

Abstract

AN IMPROVED ANTI-BURGLAR SCREW BOLT An improved anti-burglar screw bolt, comprises : a bolt (3) having a head (31) of hexagonal shape, and consisting of six sections, each having a wedge-shaped slope (312) on a bottom side, and abutting a lower end of an adjacent section at a higher end thereof to form a stopping edge (313) on the higher end thereof; a first and a second pads (4, 7), each having a central through hole (41) and six sections of around the through hole ; each section of each pad having a sloping surface (42), and abutting a lower end of an adjacent section at a higher end thereof to form an engaging edge (43) on the higher end thereof, and each pad having radial pointed insertion bars formed on other side ; a nut (5) having a hexagonal shape, and six sections, each section having a wedge-shaped slope (52) on one side thereof, and abutting a lower end of an adjacent section at a higher end thereof so that an engaging edge (53) is formed on the higher end thereof; the bolt passing through the first pad, workpieces, and the second pad in sequence, and screwed into the nut to fasten the workpieces together with the radial pointed insertion bars driven into surfaces of the workpieces.

Full Text

BACKGROUND OF THE INVENTION 1. Field of the invention The present invention relates to an anti-burglar screw bolt, more particularly an anti-burglar screw bolt, which can't become loose after long period of use on a workpiece subject to vibration, and which can't be turned loose without tools especially designed to loosen it. 2. Brief Description of the Prior Art Bolts are used as a popular means for fixing various parts of public constructions in position, e.g. fences on two sides of roads, road signs, and train rails. Bolts have to be particularly loosening-resistant to be used to fix train rails in position because train rails are subject to vibration and because accidents are likely to happen if the bolts fixing the rails become loose. And, in light of the fact that public properties such as road signs have become the targets of burglars, several improvements have been made on bolts so that the bolts can help prevent objects from being stolen besides fixing the objects in position. Bolts are also a major means for joining various parts of machines, and have to be loosening-resistant so that the machine parts won't become loose after long period of working. Referring to Fig. 1, a conventional screw bolt 1 is made loosening-resistant by means of first passing it through a pad 11, a workpiece, and a stationary object (not numbered), and then screwing it through two nuts 12, and 13. The screw bolt 1 is less likely to turn relative to the nuts 12, 13 to become loose when the workpiece is vibrating due to the friction of the nuts 12, 13 against each other as well as the fact that rotational movement of one nut 12 (13) would be hindered by the other 13 (12). However, the screw bolt 1 will still become loose after long period of use on a workpiece that is subject to vibration. And, an burglar can remove the bolt 1 from the workpiece easily if he screw the nuts 12, 13 off the bolt 1 one after the other. In other words, such screw bolt 1 can't prevent workpiece from being stolen by burglars. Referring to Fig. 2, conventionally, a hole 21 is formed on a lateral side of a nut 2, and an iron wire 22 is connected to both the hole 21 of the nut 2 and another stationary object at two ends after a screw bolt 1 is passed through a workpiece 6 and a stationary object (not numbered) and screwed into the nut 2. Thus, the nut 2 can't be turned, and the bolt 1 is less likely to become loose. And, a workpiece can be fixed to other objects with the bolt and the nut. However, such bolt and nut 1, and 2 still can't prevent the workpiece from being stolen because the iron wire 22 can be easily cut, and the nut 2 can be turned relative to the bolt 1 after the iron wire 22 is cut. SUMMARY OF THE INVENTION It is a main object of the present invention to provide an anti-burglar screw bolt, which cannot become loose after long period of use on a workpiece subject to vibration, and which cannot be removed from a workpiece without tools especially designed to undo it. The present invention provides an improved anti-burglar screw bolt, comprising : a bolt; a head of the bolt having a hexagonal shape, and consisting of six sections of a same shape ; each of the six sections having a wedge-shaped slope on a bottom side, and abutting a lower end of an adjacent section at a higher end thereof so that a stopping edge is formed on the higher end thereof; a first pad and a second pad ; each of the pads having a central through hole and six sections of a same shape around the through hole ; each of the six sections of each of the pads having a sloping surface, and abutting a lower end of an adjacent section at a higher end thereof so that an engaging edge is formed on the higher end thereof ; each of the pads having radial pointed insertion bars formed on other side ; a nut ; the nut having a hexagonal shape, and six sections of a same shape ; each of the six sections of the nut having a wedge-shaped slope on one side thereof, and abutting a lower end of an adjacent section at a higher end thereof so that an engaging edge is formed on the higher end thereof; the bolt being passed through the first pad, workpieces, and the second pad in sequence, and being screwed into the nut to fasten the workpieces together with the radial pointed insertion bars being driven into surfaces of the workpieces. The anti-burglar screw bolt includes a bolt, first and second pads, and a nut. The bolt head and the nut are hexagonal, and consist of six sections of same shape each having a slope and abutting a lower end of adjacent section at a higher end. Each of the pads has six slopes like those of the bolt head ; each of the pads has radial pointed bars formed on the other side, and gaps on lateral side for a tool to engage that is especially designed for undoing the bolt. The radial pointed bars of the pads are driven into surfaces of workpieces by the bolt when the bolt is used. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS The present invention will be better understood by reference to the accompanying drawings, wherein : Fig. 1 is a view of the first conventional screw bolt joined to a workpiece in the background, Fig. 2 is a view of the second conventional screw bolt joined to a workpiece in the Background, Fig. 3 is an exploded perspective view of the anti-burglar screw bolt according to the present invention, Fig. 4 is a partial view of the anti-burglar screw bolt of the second embodiment of the invention joined to a workpiece, Fig. 5 is a perspective view of a pad according to yet another embodiment of the present invention, Fig. 6 is a cross-sectional view of the anti-burglar screw bolt according to the present invention; and, Fig. 7 is a view of the anti-burglar screw bolt of the present invention being turned loose by means of a tool especially designed for it. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to Fig. 3, an anti-burglar screw bolt according to the present invention includes a bolt 3, pads 4, and a nut 5. The bolt 3 consists of a head 31, and a shank 32; threads are formed on the shank 32. The head 31 has a hexagonal shape, and consists of six sections of the same shape joined together; each of the six sections of the same shape includes a lateral side 311, and a wedge-shaped slope 312 on a bottom side thereof; each of the six sections of the same shape always abuts a lower end of an adjacent section at a higher end thereof so that a stopping edge 313 is formed substantially perpendicular to the shank 32 on the higher end of each of the six sections of the same shape. The pad 4 has a ring shape, having a central round through hole 41 and six sections of the same shape around the through hole 41; the outer diameter of the pad 4 is substantially equal to the length of the longest line across the bolt head 31, and the inner diameter of the pad 4 is slightly bigger than the diameter of the bolt shank 32; each of the six sections of the same shape has a sloping surface 42; each of the six sections of the same shape always abuts a lower end of an adjacent section at a higher end thereof so that an engaging edge 43 is formed on the higher end of each of the six sections of the same shape; gaps 45 are formed on lateral portions of at least one pair of opposing sections of the same shape of the pad 4. Furthermore, pointed insertion bars 44 are formed on the other side of the pad 4 in a radial manner; referring to Fig. 6, each of the pointed insertion bars 44 has a vertical side 441, and a sloping side 442, which faces the same direction as a corresponding sloping surface 42. A pad 7 is provided, which has, partly like the pad 4, six sloping surfaces of same shape on one side, and radial pointed insertion bars (not numbered) on the other side but has hexagonal shape instead of round ring shape. The pad 7 can be used with a spanner. Referring to Fig. 5, a pad 4' of the second embodiment can be used instead of the pad 4; the pad 4' has a central round through hole 41', gaps, and sloping surfaces 42' formed on six sections of the same shape around the through hole 41', which are the same as those of the pad 4. The difference between the pads 4 and 4' is that the pad 4' is formed with radial pointed insertion bars 44', which have two sloping sides instead of one. And, referring to Fig. 5 again, each of the six sections of the pad 4' is further made to ascend gradually from an outward edge towards an inward edge thereof so that each of the pointed insertion bars 44' has an inward end being taller than an inward end thereof. Thus, at the beginning of the pads 4' being fastened to a workpiece with the bolt 3, only the outer end portions of the pointed insertion bars 44' will contact the surface of the workpiece, allowing the pad 4' to be turned on the surface of the workpiece more easily. In other words, with such pointed insertion bars 44', the pad 4' allows the bolt 3 to be fastened more easily. The radial pointed insertion bars of above pads 4, 7, and 4' are preferably equidistantly positioned. The nut 5 has a hexagonal shape, and consists of six sections of the same shape; each of the six sections includes a lateral side 51, and a wedge-shaped slope 52; each of the six sections always abuts a lower end of an adjacent section at a higher end thereof so that a stopping edge 53 is formed on the higher end of each section. Referring to Fig. 6, in order to secure one workpeice 6 to another workpeice, the bolt 3 is first passed through the pad 4, the two workpeices 6, and a pad 7 in sequence, and screwed into the nut 5 at last; the pointed insertion bars 44 of the pad 4 and those of the pad 7 face the surfaces of the workpieces 6. Then, the bolt 3 is turned relative to the nut 5; the stopping edges 313 will contact corresponding engaging edges 43 of the pad 4, and engaging edges of the pad 7 will contact the stopping edges 53 of the nut 5 so that the pad 4 turns together with the bolt 3. Consequently, the pointed insertion bars are driven into the workpieces when the bolt 3 is screwed further into the nut 5. The bolt, pads, and nut combination can't possibly become loose even if they are used on a workpiece that often vibrates because the sloping surfaces 42 abut the wedge-shaped slopes 312 to hinder reverse rotation of the bolt 3, and because the sloping surfaces of the pad 7 abut the wedge-shaped slopes 52 to hinder a loosening rotation of the nut 3 relative to the bolt 3. One spanner has to be used on the pad 7, and another spanner has to be used on either one of both the bolt 3 and the nut 5 so that the bolt combination can be undone. In addition, conventional spanners or wrenches can't be used to hold the pad 4 in position because the pad 4 is round. Therefore, if the pad 7 is replaced with another pad 4, the bolt, pads, and nut combination of the present invention can't be undone unless there is a tool at hand, as shown in Fig. 7, which is especially designed for the pads 4, and can engage the gaps 45. In other words, the present invention can prevent burglars from succeeding in stealing the workpieces 6. WE CLAIM : 1. An improved anti-burglar screw bolt, comprising : a bolt; a head of the bolt having a hexagonal shape, and consisting of six sections of a same shape ; each of the six sections having a wedge-shaped slope on a bottom side, and abutting a lower end of an adjacent section at a higher end thereof so that a stopping edge is formed on the higher end thereof ; a first pad and a second pad ; each of the pads having a central through hole and six sections of a same shape around the through hole ; each of the six sections of each of the pads having a sloping surface, and abutting a lower end of an adjacent section at a higher end thereof so that an engaging edge is formed on the higher end thereof ; each of the pads having radial pointed insertion bars formed on other side ; a nut ; the nut having a hexagonal shape, and six sections of a same shape ; each of the six sections of the nut having a wedge-shaped slope on one side thereof, and abutting a lower end of an adjacent section at a higher end thereof so that an engaging edge is formed on the higher end thereof; the bolt being passed through the first pad, workpieces, and the second pad in sequence, and being screwed into the nut to fasten the workpieces together with the radial pointed insertion bars being driven into surfaces of the workpieces. 2. The improved anti-burglar screw bolt as claimed in claim 1, wherein at least one of the pads is round, and has gaps formed on lateral portions of at least one pair of opposing sections thereof. 3. The improved anti-burglar screw bolt as claimed in claim 1, wherein at least one of the pads is round, and has gaps formed on lateral portions of at least one pair of opposing sections thereof, and rest of the pads is made to have a hexagonal shape. 4. The improved anti-burglar screw bolt as claimed in claim 1, wherein the radial pointed insertion bars are equidistantly positioned. 5. The improved anti-burglar screw bolt as claimed in claim 1, wherein each of the radial pointed insertion bars has slopes on two sides thereof. 6. The improved anti-burglar screw bolt as claimed in claim 1, wherein the sloping surfaces of the pads ascend gradually from outward edges towards inward edges thereof so that the pointed insertion bars of the pads have outward ends being taller than inward ends. 7. The improved anti-burglar screw bolt as claimed in claim 1, wherein each of the radial pointed insertion bars has a slope on one side, and a straight side on other side thereof; the slopes of the radial pointed insertion bars facing a same direction as corresponding sloping surfaces formed on opposite side of the pads so as to help the radial pointed insertion bars to be driven into the surfaces of workpieces with increased ease. 8. An improved anti-burglar screw bolt, substantially as herein described, particularly with reference to the accompanying drawings. AN IMPROVED ANTI-BURGLAR SCREW BOLT An improved anti-burglar screw bolt, comprises : a bolt (3) having a head (31) of hexagonal shape, and consisting of six sections, each having a wedge-shaped slope (312) on a bottom side, and abutting a lower end of an adjacent section at a higher end thereof to form a stopping edge (313) on the higher end thereof; a first and a second pads (4, 7), each having a central through hole (41) and six sections of around the through hole ; each section of each pad having a sloping surface (42), and abutting a lower end of an adjacent section at a higher end thereof to form an engaging edge (43) on the higher end thereof, and each pad having radial pointed insertion bars formed on other side ; a nut (5) having a hexagonal shape, and six sections, each section having a wedge-shaped slope (52) on one side thereof, and abutting a lower end of an adjacent section at a higher end thereof so that an engaging edge (53) is formed on the higher end thereof; the bolt passing through the first pad, workpieces, and the second pad in sequence, and screwed into the nut to fasten the workpieces together with the radial pointed insertion bars driven into surfaces of the workpieces.

Documents:

453-kol-2003-abstract.pdf

453-kol-2003-assignment.pdf

453-kol-2003-claims.pdf

453-kol-2003-correspondence.pdf

453-kol-2003-description (complete).pdf

453-kol-2003-drawings.pdf

453-kol-2003-examination report.pdf

453-kol-2003-form 1.pdf

453-kol-2003-form 18.pdf

453-kol-2003-form 2.pdf

453-kol-2003-form 3.pdf

453-KOL-2003-FORM-27.pdf

453-kol-2003-gpa.pdf

453-kol-2003-reply to examination report.pdf

453-kol-2003-specification.pdf