Title of Invention	GEAR MECHANISM UNIT FOR A MOTOR VEHICLE ACTUATING DRIVE
Abstract	Surgical sagittal saw blade with angled teeth and chip catchment and reciprocating saw blade with angled teeth is a sagittal saw blade wherein the teeth are arranged so that relative to the teeth located closer to the outer sides of the blade, the inner located teeth are located closer to the proximal end of the blade. The blade is further formed to have an opening between at least two of the teeth that extends proximally rearward. The opening increases in width as the opening extends proximally along the length of the blade. The opening opens into a void space that functions as a chip catchment space.

Title of Invention

GEAR MECHANISM UNIT FOR A MOTOR VEHICLE ACTUATING DRIVE

Abstract

Surgical sagittal saw blade with angled teeth and chip catchment and reciprocating saw blade with angled teeth is a sagittal saw blade wherein the teeth are arranged so that relative to the teeth located closer to the outer sides of the blade, the inner located teeth are located closer to the proximal end of the blade. The blade is further formed to have an opening between at least two of the teeth that extends proximally rearward. The opening increases in width as the opening extends proximally along the length of the blade. The opening opens into a void space that functions as a chip catchment space.

Full Text	Description Gear mechanism unit for a motor vehicle actuating drive The invention relates to a gear mechanism unit for a motor vehicle actuating drive. Gear mechanism units for a motor vehicle actuating drive are already known. They have a gear mechanism housing, an axle that is fixedly connected to said gear mechanism housing and a worm gear that is mounted on said axle in such a way that it can be rotated. The worm gear is provided at its outer periphery with toothing that meshes with a worm shaft, the latter being driven by a motor shaft or forming a unit with the motor shaft. Gear mechanism units of this type are used in conjunction with window lift drives for example. The gear mechanism housing of known gear mechanism units often consists of PBT, i.e. a plastic with a 30 % proportion of short glass fibers. The axle that is connected to the gear mechanism housing consists in many cases of steel in order to prevent the axle from deforming during operation due to toothing forces. A window lift drive unit that is intended particularly for a cable window lift is known from DE 35 19 056 C2. This known drive unit has a housing in which are provided a worm gear that is driven by a drive motor and an output member that is displaced by the worm gear. Furthermore, a bearing pin that is mounted on one of the wall parts of the housing is provided for the worm gear. The bearing pin is positioned in a bearing bush that is riveted to the wall part. The output member or the worm gear is mounted on the outer peripheral surface of the bearing bush. Furthermore, the known drive unit is provided with a securing device which prevents the output member or worm gear from being pulled away from the bearing bushing. Furthermore, a window lift drive is known from DE 88 12 399 U1. This has a gear mechanism housing in which a worm gear is mounted in such a way that it can be rotated on an axle that is fixedly connected to the gear mechanism housing, said worm gear being driven by an electric drive motor. Furthermore, the worm gear is arranged such that it is rotationally engaged with an output member by means of protruding driving cams in order to bring about the up-and-down movement of a window by means of a driving plate that is coaxially and also rotatably mounted on the axle. Furthermore, a driving plate is provided that has on its front face which faces away from the worm gear an axially protruding shaft collar that encircles the axle concentrically. Said shaft collar has an external lattice structure for positive rotational engagement both with a pulley of a cable window lift and with drive pinion of an arm-type or scissor-type window lift. The pulley or the drive pinion is provided with an internal lattice structure that corresponds to the external lattice structure of the shaft collar. These measures are intended to reduce component costs for cable window lifts and arm-type or scissor-type window lifts with a simple design that is suitable for automated production. Furthermore, a motor gear mechanism drive unit that can be used in particular as a motor vehicle window lift drive is known from DE 295 13 701 Ul. This known unit has a gear mechanism housing which has a support for a worm gear axle, on which a worm gear can be mounted. The object of the invention is to disclose a new gear mechanism unit which does not cause the axle that is connected to the gear mechanism housing to deform during operation despite the occurrence of high toothing forces. This object is achieved by means of a gear mechanism unit with the features as claimed in claim 1. Advantageous embodiments and developments of the invention result from the dependent claims 2 - 8. The advantages of a gear mechanism unit with the features as claimed in claim 1 are that, due to the increase in the diameter of the axle in the axial area of the toothing, the surface pressure that occurs during operation is distributed over a larger area and is thus reduced. This prevents deformations of the axle from occurring. The ribbing as claimed in claim 2 further stabilizes the gear mechanism unit comprising the gear mechanism housing, the axle and the worm gear. If the gear mechanism housing and the axle - as claimed in claim 3 - are realized in the form of a single-piece molded plastic part made from a plastic material with a high tensile modulus, then the use of a steel axle can be avoided. This simplifies the manufacturing process, as it is not necessary to insert or take account of a steel axle during the injection molding process. A further advantage of the features of claim 3 is that the weight of the gear mechanism housing is reduced considerably. If polypropylene with long glass fiber reinforcement is used as the plastic material with a high tensile modulus, as claimed in claim 4, material costs to the extent of approximately 2 0 % can be saved, as polypropylene with long glass fiber reinforcement exhibits a density of approximately 2 0 % less with comparable mechanical properties and material price per kilogram. The worm gear is preferably arranged so that it is facetted in its contact area with the axle. This has the advantage of better producibility and improved lubrication during operation. The inner ring provided in the enlarged diameter area of the axle acts in an advantageous way as a bearing surface for a sealing ring. In comparison to known gear mechanism units, this has the advantage that a securing element and a washer for axially securing the sealing ring are not required. Further advantageous characteristics of the invention are exemplified with reference to the figures, in which; Figure 1 shows an exemplary embodiment of the gear mechanism housing of a gear mechanism unit, Figure 2 shows an exemplary embodiment of a worm gear that can be employed in the gear mechanism housing according to Figure 1, and Figure 3 shows a gear mechanism cover. A gear mechanism unit according to the present invention is intended for use in a motor vehicle actuating drive, for example a window lift drive. It has a gear mechanism housing, an axle that is fixedly connected to the gear mechanism housing, a worm gear that is provided with toothing at its outer periphery, and a gear mechanism cover. Figure 1 shows an exemplary embodiment of the gear mechanism housing of a gear mechanism unit according to the present invention. The gear mechanism housing 1 portrayed is a single-piece molded plastic part manufactured using an injection molding process. Part of this molded plastic part includes the axle 2, on which the worm gear is placed when the gear mechanism unit is assembled. In order to accommodate the worm gear, which is shown in Figure 2, the gear mechanism housing 1 has a recess 3. Furthermore, the axle 2, in its axial area which is provided for mounting the worm gear, has a greater diameter than in its other axial areas. This enlarged diameter area of axle 2 is indicated in Figure 1 with reference numeral 2a. The enlarged diameter area 2a has an outer ring 2b, an inner ring 2c and radially oriented stabilizing ribs 2d connecting the outer ring to the inner ring. The inner ring 2c acts as a bearing surface for a sealing ring 4, which is shown at the bottom right of Figure 1. Figure 2 shows an exemplary embodiment of a worm gear 5 which is inserted into the recess 3 of the gear mechanism housing 1 when the gear mechanism unit is assembled. The worm gear 5 has toothing 6 at its outer periphery. This toothing 6 meshes with a worm shaft during operation, which for its part is driven by a motor shaft or forms a unit with the motor shaft. The toothing 6 is connected to an inner worm gear ring 8 by means of a worm gear body 7 which also has radially oriented ribs. The inner surface of this inner worm gear ring 8 acts as a bearing area and comes into contact with the outer surface of the outer ring 2b of the enlarged diameter area 2a of the axle 2 when the worm gear 5 is inserted into the gear mechanism housing 1. The inner surface 9 of the inner worm gear ring 8, i.e. the bearing surface of the worm gear 5, is preferably facetted. These facets 9 can be created by means of a grinding process or as part of the injection molding process. The advantages of a facetted arrangement of this type is that the worm gear can be more easily manufactured, as there is no need for a highly accurate round internal surface, and that lubrication of the bearing area is improved during operation of the gear mechanism unit. The worm gear shown in Figure 2 is a single-piece component made from polyacetal (POM), or a substance with similar properties, that can be manufactured as part of an injection molding process. The advantage of a gear mechanism housing that has. an axle with a larger .diameter in the axial area of the worm gear is that the toothing forces that act on the axle when the gear mechanism unit is in operation do not cause deformations in the axle. This ensures that the meshing between the external toothing of the worm gear and the worm shaft is guaranteed, even when the gear mechanism unit has been operated for several years. This advantage can be enhanced in that the gear mechanism housing 1, which is a single-piece molded plastic part, is made from a plastic material that exhibits a high tensile modulus. The tensile modulus is preferably in the range greater than. 9,000 megapascal. Polypropylene with long glass fiber reinforcement is preferably used according to the present invention. This has a density of approximately 20 % less than PBT with 30 % short glass fiber with comparable mechanical properties and the same material price per kilogram. A further advantage of the invention is that a weight reduction can be achieved compared to known gear mechanism housings with a steel axle. Furthermore, there is no requirement for a securing element and a washer for axially securing the sealing ring, because the worm gear can be axially secured by means of a gear mechanism cover 10 that is placed on top. An example of a gear mechanism cover 10 of this type is shown in Figure 3. This gear mechanism cover has a projection running around the edge that fits into an appropriate groove in the gear mechanism housing and is clamped there. The diameter of the axle 2 in its axial area 2e, which is situated above the area with the enlarged diameter 2a in Figure 1, is preferably dimensioned so that it corresponds to the diameter of known axles. This has the advantage that the customer interface on the output side need not be changed in comparison to known gear mechanism units. I/we claim: 1. A surgical saw blade (20, 60, 80, 160, 190, 210, 230) comprising: a planar blade body (22, 82, 162, 192, 212, 232), said blade body having opposed proximal and distal ends; geometric features (32, 36, 38) integral with the proximal end of said blade body to couple said blade body to a drive head so that said drive head can oscillate the blade body so that the distal end pivots relative to the proximal end; and a plurality of teeth (28, 86, 166, 194, 222, 234) that extend forward from the distal end of said blade body characterized in that, said blade body is formed with an opening (40, 90, 168, 196, 224, 235) that extends from between two said teeth towards the proximal end of said blade body. 2. The surgical saw blade of Claim 1, wherein said blade body is further formed so that as the opening between the teeth extends proximally, the width of the opening increases. 3. The surgical saw blade of Claims 1 or 2, wherein said blade body is further formed to have a first void space (48, 64, 92, 174, 198, 218, 242) that is located proximal to said opening to which said opening opens into, the void space having a width greater than the width of the opening. 4. The surgical saw blade of Claim 3, wherein said blade body is formed to have: a second void space (50) that is spaced away from and located proximal to the second void space; and a recess (52) that extends inwardly from an outer surface of said blade body that extends from the first void space to the second void space. 5. The surgical saw blade of Claims 1, 2, 3 or 4, wherein said blade body is formed to have at least one indentation (29, 102, 182, 223) that extends proximally from said teeth and the indentation opens into the first void space. 6. The surgical saw blade of Claims 1, 2, 3, 4 or 5, wherein: said blade body has a longitudinal axis that extends from the proximal end to the distal end; a plurality of said teeth are located at the distal end of said blade on each side of the longitudinal axis; each said tooth has a tip 42, said teeth are arranged so that on each side of the blade body longitudinal axis at least one said tooth has a tip (42b, 42j) located close to the longitudinal axis that is located closer to the proximal end of said blade body than the tip (42a, 42i) of an adjacent tooth that is spaced from the longitudinal axis. 7. The surgical saw blade of Claim 6, wherein: said blade body has a longitudinal axis that extends from the proximal end to the distal end; a plurality of said teeth are located at the distal end of said blade on each side of the blade body longitudinal axis; each said tooth has a tip and said teeth are arranged so that, on each side of the blade body longitudinal axis, each tooth is positioned so that, relative to the adjacent tooth tip that is closer to the longitudinal axis, the tooth tip is spaced further from the blade body proximal end. 8. The surgical saw blade of Claims 1, 2, 3, 4, 5, 6 or 7: wherein the blade body has a longitudinal axis that extends from the proximal end to the distal end; and the blade body is formed so that the opening is located along the blade body longitudinal axis. 9. The surgical saw blade of Claim 1, wherein: said blade body has opposed side edges that extend proximally from the distal end; a plurality of teeth extend forward from the distal end of the blade body on each side of the opening so that on each side of the opening there is an outer tooth close to the adjacent side edge and at least one inner tooth spaced from the adjacent side edge; and said blade body has a longitudinal axis that extends from the proximal end to the distal end and there are a plurality of teeth on each side of the longitudinal axis; and on each side of the longitudinal axis, each pair of adjacent teeth are arranged so that the said tip of said tooth located closer to the adjacent side of said blade body is, in comparison to the tip of the tooth further from the adjacent side, spaced further from the proximal end of said blade body. 14. The surgical saw blade of Claim 11, wherein: said blade body has a longitudinal axis that extends from the proximal end to the distal end and there are a plurality of teeth on each side of the longitudinal axis so that on each side of the longitudinal axis there is an outer tooth close to the adjacent side and at least one inner tooth spaced from the adjacent side; and on each side of the longitudinal axis said teeth are arranged so that the outer tooth has a tip (42a, 421) with an orientation different from the tip (42b, 42j) that is different from the adjacent at least one inner tooth. 15. A surgical saw blade (120, 140), said surgical saw blade having: a blade body (122, 142) having a proximal end, a distal end spaced from the proximal end and a longitudinal axis (134, 154) that extends from the proximal end to the distal end and at least one side that extends from the distal end to the proximal end; at least one geometric (127, 144) feature integral with said blade body for coupling said blade body to a drive head so that said drive head can reciprocate said blade body along the longitudinal axis of the blade body; and a plurality of teeth (130, 150) that extend away from the side of said blade body, each said tooth having a tip, characterized in that at least two said teeth being arranged to have tips (132a & 132b, 152a & 152b) that are located different distances from the longitudinal axis of said blade body. 16. The surgical saw blade of Claim 15, wherein: on each side of the opening, said teeth are arranged so that the outer tooth has a tip (42a, 421) with an orientation that is different from the orientation of the tip (42b, 42j) of the adjacent at least one inner tooth. 10. The surgical saw blade of Claims 3, 4, 5, 6, 7 8, or 9, wherein said blade body is formed with an indentation (114) that extends from a proximal section of the void space to a side edge of said blade body. 11. A surgical saw blade comprising: a planar blade body (22), said blade body having opposed proximal and distal ends and opposed sides that extend proximally from the distal end; geometric features (32, 36, 38) integral with the proximal end of said blade body to couple said blade body to a drive head so that said drive head can oscillate the blade body so that the distal end pivots relative to the proximal end; and a plurality of teeth (28) that extend forward from the distal end, each said tooth having a tip (42), characterized in that: the teeth being arranged so that at least one pair of adjacent teeth are positioned so that the said tip (42a) of said tooth located closer to the adjacent side of said blade body is, in comparison to the tip (42b) of the tooth further from the adjacent side, spaced further from the proximal end of said blade body. 12. The surgical saw blade of Claim 11, wherein: said teeth are arranged so that a first pair of adjacent teeth is adjacent a first side of said blade body and a second pair of adjacent is adjacent a second side of said body; and each said pair of adjacent teeth are arranged so that the said tip of said tooth located closer to the adjacent side of said blade body (42a, 42i) is, in comparison to the tip of the tooth further from the adjacent side (42b, 42j) spaced further from the proximal end of said blade body. 13. The surgical saw blade of Claims 11 or 12, wherein: at least three said teeth extend away from the side of said blade body; and said teeth are arranged so that, for each said pair of adjacent teeth, said adjacent tips of said teeth are located different distances from the longitudinal axis of said blade body. 17. The surgical saw blade of Claims 15 or 16, wherein for at least one pair of adjacent said teeth said adjacent tips of said teeth are arranged so that the tip (132b) of said tooth of the pair located closer to the proximal end of said blade body is located closer from the longitudinal axis of said blade body than the tip (132a) of said tooth of the pair located further to the proximal end of said blade body. 18. The surgical saw blade of Claims 15 or 16, wherein for at least one pair of adjacent said teeth, said adjacent tips of said teeth are arranged so that the tip (152jb) of said tooth of the pair located closer to the proximal end of said blade body is located further from the longitudinal axis of said blade body than the tip (152a) of said tooth of the pair located further to the proximal end of said blade body. 19. The surgical saw blade of Claims 15, 16, 17 or 18, wherein: at least four said teeth extend away from the side of said blade body; and at least three said adjacent teeth are arranged so that the tips (132b-d, 152b-d) of said teeth are on a common line, the line being at an angle to the longitudinal axis of said blade body.

Full Text

Description
Gear mechanism unit for a motor vehicle actuating drive
The invention relates to a gear mechanism unit for a motor vehicle actuating drive.
Gear mechanism units for a motor vehicle actuating drive are already known. They have a gear mechanism housing, an axle that is fixedly connected to said gear mechanism housing and a worm gear that is mounted on said axle in such a way that it can be rotated. The worm gear is provided at its outer periphery with toothing that meshes with a worm shaft, the latter being driven by a motor shaft or forming a unit with the motor shaft.
Gear mechanism units of this type are used in conjunction with window lift drives for example. The gear mechanism housing of known gear mechanism units often consists of PBT, i.e. a plastic with a 30 % proportion of short glass fibers. The axle that is connected to the gear mechanism housing consists in many cases of steel in order to prevent the axle from deforming during operation due to toothing forces.
A window lift drive unit that is intended particularly for a cable window lift is known from DE 35 19 056 C2. This known drive unit has a housing in which are provided a worm gear that is driven by a drive motor and an output member that is displaced by the worm gear. Furthermore, a bearing pin that is mounted on one of the wall parts of the housing is provided for the worm gear. The bearing pin is positioned in a bearing bush that is riveted to the wall part. The output member or the worm gear is mounted on the outer peripheral surface of the bearing
bush. Furthermore, the known drive unit is provided with a securing device which prevents the output member or worm gear from being pulled away from the bearing bushing.
Furthermore, a window lift drive is known from DE 88 12 399 U1. This has a gear mechanism housing in which a worm gear is mounted in such a way that it can be rotated on an axle that is fixedly connected to the gear mechanism housing, said worm gear being driven by an electric drive motor. Furthermore, the worm gear is arranged such that it is rotationally engaged with an output member by means of protruding driving cams in order to bring about the up-and-down movement of a window by means of a driving plate that is coaxially and also rotatably mounted on the axle. Furthermore, a driving plate is provided that has on its front face which faces away from the worm gear an axially protruding shaft collar that encircles the axle concentrically. Said shaft collar has an external lattice structure for positive rotational engagement both with a pulley of a cable window lift and with drive pinion of an arm-type or scissor-type window lift. The pulley or the drive pinion is provided with an internal lattice structure that corresponds to the external lattice structure of the shaft collar. These measures are intended to reduce component costs for cable window lifts and arm-type or scissor-type window lifts with a simple design that is suitable for automated production.
Furthermore, a motor gear mechanism drive unit that can be used in particular as a motor vehicle window lift drive is known from DE 295 13 701 Ul. This known unit has a gear mechanism housing which has a support for a worm gear axle, on which a worm gear can be mounted.
The object of the invention is to disclose a new gear mechanism unit which does not cause the axle that is connected to the gear mechanism housing to deform during operation despite the occurrence of high toothing forces.
This object is achieved by means of a gear mechanism unit with the features as claimed in claim 1. Advantageous embodiments and developments of the invention result from the dependent claims 2 - 8.
The advantages of a gear mechanism unit with the features as claimed in claim 1 are that, due to the increase in the diameter of the axle in the axial area of the toothing, the surface pressure that occurs during operation is distributed over a larger area and is thus reduced. This prevents deformations of the axle from occurring.
The ribbing as claimed in claim 2 further stabilizes the gear mechanism unit comprising the gear mechanism housing, the axle and the worm gear.
If the gear mechanism housing and the axle - as claimed in claim 3 - are realized in the form of a single-piece molded plastic part made from a plastic material with a high tensile modulus, then the use of a steel axle can be avoided. This simplifies the manufacturing process, as it is not necessary to insert or take account of a steel axle during the injection molding process. A further advantage of the features of claim 3 is that the weight of the gear mechanism housing is reduced considerably.
If polypropylene with long glass fiber reinforcement is used as the plastic material with a high tensile modulus, as claimed in claim 4, material costs to the extent of
approximately 2 0 % can be saved, as polypropylene with long glass fiber reinforcement exhibits a density of approximately 2 0 % less with comparable mechanical properties and material price per kilogram.
The worm gear is preferably arranged so that it is facetted in its contact area with the axle. This has the advantage of better producibility and improved lubrication during operation.
The inner ring provided in the enlarged diameter area of the axle acts in an advantageous way as a bearing surface for a sealing ring. In comparison to known gear mechanism units, this has the advantage that a securing element and a washer for axially securing the sealing ring are not required.
Further advantageous characteristics of the invention are exemplified with reference to the figures, in which;
Figure 1 shows an exemplary embodiment of the gear mechanism housing of a gear mechanism unit,
Figure 2 shows an exemplary embodiment of a worm gear that can be employed in the gear mechanism housing according to Figure 1, and
Figure 3 shows a gear mechanism cover.
A gear mechanism unit according to the present invention is intended for use in a motor vehicle actuating drive, for example a window lift drive. It has a gear mechanism housing, an axle that is fixedly connected to the gear mechanism housing, a worm gear that is provided with
toothing at its outer periphery, and a gear mechanism cover.
Figure 1 shows an exemplary embodiment of the gear mechanism housing of a gear mechanism unit according to the present invention. The gear mechanism housing 1 portrayed is a single-piece molded plastic part manufactured using an injection molding process. Part of this molded plastic part includes the axle 2, on which the worm gear is placed when the gear mechanism unit is assembled. In order to accommodate the worm gear, which is shown in Figure 2, the gear mechanism housing 1 has a recess 3.
Furthermore, the axle 2, in its axial area which is provided for mounting the worm gear, has a greater diameter than in its other axial areas. This enlarged diameter area of axle 2 is indicated in Figure 1 with reference numeral 2a. The enlarged diameter area 2a has an outer ring 2b, an inner ring 2c and radially oriented stabilizing ribs 2d connecting the outer ring to the inner ring. The inner ring 2c acts as a bearing surface for a sealing ring 4, which is shown at the bottom right of Figure 1.
Figure 2 shows an exemplary embodiment of a worm gear 5 which is inserted into the recess 3 of the gear mechanism housing 1 when the gear mechanism unit is assembled. The worm gear 5 has toothing 6 at its outer periphery. This toothing 6 meshes with a worm shaft during operation, which for its part is driven by a motor shaft or forms a unit with the motor shaft. The toothing 6 is connected to an inner worm gear ring 8 by means of a worm gear body 7 which also has radially oriented ribs. The inner surface of this inner worm gear ring 8 acts as a bearing area and
comes into contact with the outer surface of the outer ring 2b of the enlarged diameter area 2a of the axle 2 when the worm gear 5 is inserted into the gear mechanism housing 1.
The inner surface 9 of the inner worm gear ring 8, i.e. the bearing surface of the worm gear 5, is preferably facetted. These facets 9 can be created by means of a grinding process or as part of the injection molding process. The advantages of a facetted arrangement of this type is that the worm gear can be more easily manufactured, as there is no need for a highly accurate round internal surface, and that lubrication of the bearing area is improved during operation of the gear mechanism unit.
The worm gear shown in Figure 2 is a single-piece component made from polyacetal (POM), or a substance with similar properties, that can be manufactured as part of an injection molding process.
The advantage of a gear mechanism housing that has. an axle with a larger .diameter in the axial area of the worm gear is that the toothing forces that act on the axle when the gear mechanism unit is in operation do not cause deformations in the axle. This ensures that the meshing between the external toothing of the worm gear and the worm shaft is guaranteed, even when the gear mechanism unit has been operated for several years.
This advantage can be enhanced in that the gear mechanism housing 1, which is a single-piece molded plastic part, is made from a plastic material that exhibits a high tensile modulus. The tensile modulus is preferably in the range greater than. 9,000 megapascal. Polypropylene with
long glass fiber reinforcement is preferably used according to the present invention. This has a density of approximately 20 % less than PBT with 30 % short glass fiber with comparable mechanical properties and the same material price per kilogram.
A further advantage of the invention is that a weight reduction can be achieved compared to known gear mechanism housings with a steel axle. Furthermore, there is no requirement for a securing element and a washer for axially securing the sealing ring, because the worm gear can be axially secured by means of a gear mechanism cover 10 that is placed on top. An example of a gear mechanism cover 10 of this type is shown in Figure 3. This gear mechanism cover has a projection running around the edge that fits into an appropriate groove in the gear mechanism housing and is clamped there.
The diameter of the axle 2 in its axial area 2e, which is situated above the area with the enlarged diameter 2a in Figure 1, is preferably dimensioned so that it corresponds to the diameter of known axles. This has the advantage that the customer interface on the output side need not be changed in comparison to known gear mechanism units.

I/we claim:
1. A surgical saw blade (20, 60, 80, 160, 190, 210,
230) comprising:
a planar blade body (22, 82, 162, 192, 212,
232), said blade body having opposed proximal
and distal ends;
geometric features (32, 36, 38) integral with
the proximal end of said blade body to couple
said blade body to a drive head so that said
drive head can oscillate the blade body so that
the distal end pivots relative to the proximal
end; and
a plurality of teeth (28, 86, 166, 194, 222,
234) that extend forward from the distal end of
said blade body
characterized in that,
said blade body is formed with an opening (40,
90, 168, 196, 224, 235) that extends from
between two said teeth towards the proximal end
of said blade body.
2. The surgical saw blade of Claim 1, wherein said blade body is further formed so that as the opening between the teeth extends proximally, the width of the opening increases.
3. The surgical saw blade of Claims 1 or 2, wherein said blade body is further formed to have a first void space (48, 64, 92, 174, 198, 218, 242) that is located proximal to said opening to which said opening opens into, the void space having a width greater than the width of the opening.
4. The surgical saw blade of Claim 3, wherein said blade body is formed to have:
a second void space (50) that is spaced away
from and located proximal to the second void
space; and
a recess (52) that extends inwardly from an
outer surface of said blade body that extends
from the first void space to the second void
space.
5. The surgical saw blade of Claims 1, 2, 3 or 4,
wherein said blade body is formed to have at
least one indentation (29, 102, 182, 223) that
extends proximally from said teeth and the indentation opens into the first void space.
6. The surgical saw blade of Claims 1, 2, 3, 4
or 5, wherein:
said blade body has a longitudinal axis that extends from the proximal end to the distal end; a plurality of said teeth are located at the distal end of said blade on each side of the longitudinal axis;
each said tooth has a tip 42, said teeth are arranged so that on each side of the blade body longitudinal axis at least one said tooth has a tip (42b, 42j) located close to the longitudinal axis that is located closer to the proximal end of said blade body than the tip (42a, 42i) of an adjacent tooth that is spaced from the longitudinal axis.
7. The surgical saw blade of Claim 6, wherein:
said blade body has a longitudinal axis that extends from the proximal end to the distal end; a plurality of said teeth are located at the distal end of said blade on each side of the blade body longitudinal axis;
each said tooth has a tip and said teeth are arranged so that, on each side of the blade body longitudinal axis, each tooth is positioned so that, relative to the adjacent tooth tip that is closer to the longitudinal axis, the tooth tip is spaced further from the blade body proximal end.
8. The surgical saw blade of Claims 1, 2, 3, 4, 5,
6 or 7:
wherein the blade body has a longitudinal axis that extends from the proximal end to the distal end; and
the blade body is formed so that the opening is located along the blade body longitudinal axis.
9. The surgical saw blade of Claim 1, wherein:
said blade body has opposed side edges that extend proximally from the distal end; a plurality of teeth extend forward from the distal end of the blade body on each side of the opening so that on each side of the opening there is an outer tooth close to the adjacent side edge and at least one inner tooth spaced from the adjacent side edge; and
said blade body has a longitudinal axis that extends from the proximal end to the distal end and there are a plurality of teeth on each side of the longitudinal axis; and
on each side of the longitudinal axis, each pair of adjacent teeth are arranged so that the said tip of said tooth located closer to the adjacent side of said blade body is, in comparison to the tip of the tooth further from the adjacent side, spaced further from the proximal end of said blade body.
14. The surgical saw blade of Claim 11, wherein: said blade body has a longitudinal axis that extends from the proximal end to the distal end and there are a plurality of teeth on each side of the longitudinal axis so that on each side of the longitudinal axis there is an outer tooth close to the adjacent side and at least one inner tooth spaced from the adjacent side; and on each side of the longitudinal axis said teeth are arranged so that the outer tooth has a tip (42a, 421) with an orientation different from the tip (42b, 42j) that is different from the adjacent at least one inner tooth.
15. A surgical saw blade (120, 140), said surgical saw blade having:
a blade body (122, 142) having a proximal end, a
distal end spaced from the proximal end and a
longitudinal axis (134, 154) that extends from
the proximal end to the distal end and at least
one side that extends from the distal end to the
proximal end;
at least one geometric (127, 144) feature
integral with said blade body for coupling said
blade body to a drive head so that said drive
head can reciprocate said blade body along the
longitudinal axis of the blade body; and
a plurality of teeth (130, 150) that extend away
from the side of said blade body, each said
tooth having a tip,
characterized in that
at least two said teeth being arranged to have
tips (132a & 132b, 152a & 152b) that are located
different distances from the longitudinal axis
of said blade body.
16. The surgical saw blade of Claim 15, wherein:
on each side of the opening, said teeth are arranged so that the outer tooth has a tip (42a, 421) with an orientation that is different from the orientation of the tip (42b, 42j) of the adjacent at least one inner tooth.
10. The surgical saw blade of Claims 3, 4, 5, 6, 7 8, or 9, wherein said blade body is formed with an indentation (114) that extends from a proximal section of the void space to a side edge of said blade body.
11. A surgical saw blade comprising:
a planar blade body (22), said blade body having opposed proximal and distal ends and opposed sides that extend proximally from the distal end;
geometric features (32, 36, 38) integral with the proximal end of said blade body to couple said blade body to a drive head so that said drive head can oscillate the blade body so that the distal end pivots relative to the proximal end; and
a plurality of teeth (28) that extend forward from the distal end, each said tooth having a tip (42),
characterized in that:
the teeth being arranged so that at least one pair of adjacent teeth are positioned so that the said tip (42a) of said tooth located closer to the adjacent side of said blade body is, in comparison to the tip (42b) of the tooth further from the adjacent side, spaced further from the proximal end of said blade body.
12. The surgical saw blade of Claim 11, wherein:
said teeth are arranged so that a first pair of
adjacent teeth is adjacent a first side of said
blade body and a second pair of adjacent is
adjacent a second side of said body; and
each said pair of adjacent teeth are arranged so that the said tip of said tooth located closer to the adjacent side of said blade body (42a, 42i) is, in comparison to the tip of the tooth further from the adjacent side (42b, 42j) spaced further from the proximal end of said blade body.
13. The surgical saw blade of Claims 11 or 12,
wherein:
at least three said teeth extend away from the side of said blade body; and
said teeth are arranged so that, for each said pair of adjacent teeth, said adjacent tips of said teeth are located different distances from the longitudinal axis of said blade body.
17. The surgical saw blade of Claims 15 or 16, wherein for at least one pair of adjacent said teeth said adjacent tips of said teeth are arranged so that the tip (132b) of said tooth of the pair located closer to the proximal end of said blade body is located closer from the longitudinal axis of said blade body than the tip (132a) of said tooth of the pair located further to the proximal end of said blade body.
18. The surgical saw blade of Claims 15 or 16, wherein for at least one pair of adjacent said teeth, said adjacent tips of said teeth are arranged so that the tip (152jb) of said tooth of the pair located closer to the proximal end of said blade body is located further from the longitudinal axis of said blade body than the tip (152a) of said tooth of the pair located further to the proximal end of said blade body.
19. The surgical saw blade of Claims 15, 16, 17 or 18, wherein:
at least four said teeth extend away from the side of said blade body; and
at least three said adjacent teeth are arranged so that the tips (132b-d, 152b-d) of said teeth are on a common line, the line being at an angle to the longitudinal axis of said blade body.

Documents:

http://ipindiaonline.gov.in/patentsearch/GrantedSearch/viewdoc.aspx?id=Sn4oIZZ1LGetGleQct4SNg==&loc=+mN2fYxnTC4l0fUd8W4CAA==

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Patent Number

268768

Indian Patent Application Number

2885/DELNP/2008

PG Journal Number

38/2015

Publication Date

18-Sep-2015

Grant Date

16-Sep-2015

Date of Filing

07-Apr-2008

Name of Patentee

BROSE FAHRZEUGTEILE GMBH & CO. KOMMANDITGESELLSCHAFT, WURZBURG

Applicant Address

OHMSTRASSE 2 A, D-97076 WURZBURG, GERMANY

Inventors:

#	Inventor's Name	Inventor's Address
1	HENIG, MARGIT	AM SCHWAIGERSKELLER 5, 97228 ROTTENDORF (DE)
2	KLINGLER, PETER	WALLWEG 6, 97277 NEUBRUNN (DE)
3	GREULICH, JURGEN	DORFACKER 40, 97084 WURZBURG (DE)

PCT International Classification Number

E05F 15/16

PCT International Application Number

PCT/EP2006/066071

PCT International Filing date

2006-09-06

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10 2005 048 888.9	2005-10-12	Germany