Abstract: A gear mechanism (6) for a rolling mill drive includes at least one involute cylindrical gear tooth system between at least two intermeshing gear wheels (3) with asymmetrical gearing. The normal pressure angle of the load-bearing tooth flanks (5) of the gear wheels (3) is greater than 20° and less than or equal to 30°, and the normal pressure angle of the trailing flanks (4) of the gear wheels is greater than or equal to 14° and less than 22°. A rolling mill drive has a gear mechanism (6) of this type, and the gear mechanism (6) is used as a rolling mill gear mechanism.

Abstract: A differential disconnect system for a vehicle includes a housing arranged to receive a motor torque, a first clutch element, and a differential. The housing includes radially inwardly facing teeth and the first clutch element is drivingly engaged with and axially slidable on the radially inwardly facing teeth. The first clutch element includes a first face spline. The differential unit is arranged for driving engagement with a pair of axle shafts and includes a second clutch element with a second face spline arranged to engage the first face spline for selective torque transmission between the housing and the differential unit.

Abstract: A gearbox may include a drive spindle and several interconnected gear clusters arranged in a housing. A first of the gear clusters is coaxially fastened to the spindle, and has an outboard gear and an inboard gear. The first gear cluster drives a belt to operate one or more of the other gear clusters, and the inboard gear is physically divided into a plurality of segments. A shifting system for the gearbox includes an actuator configured to urge the segments of the inboard gear of the first gear cluster into and out of the plane of the belt, such that a gear ratio of the gearbox is changeable without displacing the belt out of the plane.

Abstract: A method for shifting a segmented gear may include rotating a gear cluster including a first gear and a coaxial second gear using a power transfer mechanism (e.g., a belt or a chain). The power transfer mechanism defines a plane and is wrapped partially around the first gear. and wherein the first gear has a plurality of gear segments independently movable (e.g., pivotable or translatable) into and out of the plane. A plurality of radially transitionable sliders are rotated in tandem with the first gear, and each of the sliders is operatively coupled to a corresponding one of the gear segments of the first gear. In sequence, each segment of the first gear is moved out of the plane of the power transfer mechanism by urging the slider in a radial direction using a segment actuator, such that the power transfer mechanism wraps at least partially around the second gear.

Abstract: A gearbox may include a drive spindle and several interconnected gear clusters arranged in a housing. A first of the gear clusters is coaxially fastened to the spindle, and has an outboard gear and an inboard gear. The first gear cluster drives a belt or chain to operate one or more of the other gear clusters, and the inboard gear is physically divided into a plurality of segments. A shifting system for the gearbox includes an actuator configured to urge the segments of the inboard gear of the first gear cluster into and out of the plane of the belt or chain via a toggle and slider mechanism, such that a gear ratio of the gearbox is changeable without displacing the belt or chain out of the plane.

Abstract: The invention relates to a toothed wheel assembly for a cassette having a first toothed wheel and a second toothed wheel that are concentric. The second tooth wheel has a greater number of teeth than the first toothed wheel; a radially inner cylindrical portion to engage a sprocket support body; a plurality of spokes comprising respective first constraining portions to the first toothed wheel and second constraining portions to the radially inner cylindrical portion; and a plurality of connection bodies that connect the first. The second toothed wheel has an axially-extending portion with at least one pair of spokes having connection bodies that include axially-extending portions in the circumferential direction and at least partially contained in the minimum circumferential extension a respective spoke.

Abstract: Chain-rings sets for power transmission systems, where at least one of the chain-rings is formed by independent segments provided with axial displacement means, where the segmentation is optimum both for shifts to a bigger chain-ring or a smaller chain-ring through a relative configuration between chain-rings, especially between the teeth involved in the power transmission during the shift, that ensure a smooth shift, efficient in the power transmission and reducing as possible the friction and the wear of the components.

Abstract: A gearbox may include a drive spindle and several interconnected gear clusters arranged in a housing. A first of the gear clusters is coaxially fastened to the spindle, and has an outboard gear and an inboard gear. The first gear cluster drives a belt to operate one or more of the other gear clusters, and the inboard gear is physically divided into a plurality of segments. A shifting system for the gearbox includes an actuator configured to urge the segments of the inboard gear of the first gear cluster into and out of the plane of the belt, such that a gear ratio of the gearbox is changeable without displacing the belt out of the plane.

Abstract: A gearbox may include a drive spindle and several interconnected gear clusters arranged in a housing. A first of the gear clusters is coaxially fastened to the spindle, and has an outboard gear and an inboard gear. The first gear cluster drives a belt or chain to operate one or more of the other gear clusters, and the inboard gear is physically divided into a plurality of segments. A shifting system for the gearbox includes an actuator configured to urge the segments of the inboard gear of the first gear cluster into and out of the plane of the belt or chain via a toggle and slider mechanism, such that a gear ratio of the gearbox is changeable without displacing the belt or chain out of the plane.

Abstract: A gear includes an inner hub formed of metal material, the inner hub having an outer surface defining a plurality of outer teeth. The gear also includes an outer ring formed of non-metal material, the outer ring having an inner diameter that is smooth. The outer ring is disposed in an interference fit with the outer teeth of the inner hub.

Abstract: A differential assembly having a case and a ring gear. The ring gear is mounted to the case and may include a mounting flange and a set of teeth. The mounting flange may have a fastener hole. The set of teeth overhangs the fastener hole such that the set of teeth extend further toward the axis than at least a portion of the fastener hole.

Abstract: A hybrid composite and metallic gear includes a generally cylindrical shaft interface. A composite web is coupled to the shaft interface. The composite web includes a generally cylindrical rim having an outer surface. The outer surface includes a plurality of locks each having a radially outwardly extending profile. A generally cylindrical metallic gear ring having a plurality of external teeth includes an inner surface. The inner surface includes a plurality of detents each having a radially outwardly extending profile that corresponds with one of the locks of the composite web. When the composite web is positioned within the metallic gear ring, the corresponding locks and detents each form a lock and detent coupling establishing an interlocking interface between the composite web and the metallic gear ring.

Abstract: A parking lock gear (1) for a parking lock arrangement for locking an output shaft of a transmission of a vehicle has teeth (5). An annular element (2) is fixed to the parking lock gear (1) and has outer teeth (3) which engage an actuated locking pawl.

Abstract: A gear arrangement is provided with a built-up for a shaft or pinion to rotate in unison therewith. The gear includes a gear rim and two flanges arranged axially on both sides and fixed them against the gear rim in a positive-locking connection. A hub, over which the respective other parts of the gear are pushed, is formed on at least one of the parts of the gear. The parts of the gear are held together without the use of rivets or screws by a clamped connection including a clamping ring, which is caused to mesh with a groove extending circumferentially on the circumference of the hub or shaft. The clamped connection presses the respective flange outer surface in a spring-mounted manner. Mutually corresponding elevations and depressions on the axial outer surfaces of the gear rim as well as on the axially inner surfaces of the flanges mesh with one another.

Abstract: A housing and gear assembly comprises a cylindrical rotating housing having an inner cylindrical wall and a center bore for rotatably mounting the housing on an elongated shaft. An internal ring gear has a plurality of internal gear teeth, an external cylindrical wall and a plurality of spaced apart broach teeth projecting radially outwardly from the external wall for cutting engagement with the internal wall of the housing as the ring gear is press fit into the housing to fixedly and rotationally secure the ring gear to the housing.

Abstract: A transfer ring (10) for a continously variable transmission. The transfer ring (10) includes an inner ring (12), an outer ring (18) and a spacer ring (24). The inner, outer and spacer rings are substantially coaxial with a transfer ring (10) axis. The spacer ring (24) is disposed radially between the inner and outer rings. The inner and outer rings are secured to the spacer ring (24) to substantially prevent relative movement therebetween. The spacer ring (24) has non-overlapping radially inwardly (26) and radially outwardly (27) facing slots extending respectively into inner and outer circumferences thereof. Laminar segments (42) are mounted in each of the slots and are slidably displaceable in a direction parallel to the transfer ring axis (22). The segments (42) are generally radially aligned with the transfer ring axis (22) and have upper (44) and lower (45) tabs straddling the spacer ring (24) to limit the distance which the segments (42) may be slidably displaced.

Abstract: A connection for preventing relative movement between coupled members in a clamped joint. In particular, ring gear/differential housing members are connected across a roughened surface finish providing protrusions and allow positive load transfer without slippage. Different methods are proposed to achieve the roughening, or surface modification, of the backside of the ring gear surface, and this design provides increased frictional coefficients without adversely affecting performance of the differential assembly. The simplicity and low cost of this connection makes it particularly useful for a wide variety of these bolted assemblies.

Abstract: The timing gear device or structure (26) has a pair of timing gears (28, 30) mounted on parallel rotating shafts (22, 24). Each timing gear (28, 30) has an outer gear portion (32) and a concentric interfitting inner gear portion (34). Outer gear portions (34) have teeth (48) which intermesh to transmit torque from drive shaft (22) to driven shaft (24). Each concentric inner gear portion (34) has longitudinally extending splines (44) in meshing relation with splines (46) on the inner periphery of outer gear portion (32). As shown in particular in FIGS. 5-8, the timing gears can be replaced by timing structure (26) by angular alignment or indexing of driven shaft (24) with inner gear portion (34) secured thereto while outer concentric gear portion (32) is removed. For indexing, drive shaft (22) is fixed and timing gear (28) is mounted thereon by key (40).

Abstract: A radially compliant gear is provided to reduce transmitted shock loads and/or resist jamming as a result of debris entering its mesh with another gear. The radially compliant gear includes a hub adapted to rotate about an axis, and a compliant rim. The hub includes a first surface that faces radially inwardly. The rim includes external gear teeth and a second surface that faces radially outwardly. The rim is mounted to the hub through the first and second surfaces to allow localized radial deflections of the rim relative to the hub. The first and second surfaces are configured to provide a predetermined minimum radial preload between the rim and the hub.

Abstract: A rotatable apparatus includes a pair of rotatable members joined by a stress dissipating structure. The stress dissipating structure can be employed in a gear, sprocket, clutch or the like. In one embodiment of the present invention, antibuckling plates generally spanning between a hub and rim define a hollow cavity. In another embodiment of the present invention, the stress dissipating structure includes a specifically configured sets of nodules moving the hub and rim. An additional aspect of the present invention provides a stress dissipating structure employing various anti-buckling plate attachment constructions. In still another embodiment of the present invention, a uniquely sized and packaged gear, gear housing and/or motor are employed in order to maximize output force per pound of material efficiencies.

Abstract: A chain wheel assembly for a bicycle includes a large chain wheel, a small chain wheel, and a crank arm for supporting the chain wheels. The crank arm has an arm body, a boss for connecting the crank arm to a crank axle of the bicycle, and wheel mounting extensions extending radially outwardly from the boss. The small chain wheel is connected to the crank arm through a first connecting device provided on the wheel mounting extensions. The large chain wheel is connected to the small chain wheel through a second connecting device arranged radially outwardly of the first connecting device. The large chain wheel is connected to the crank arm only through the second connecting device and small chain wheel.

Abstract: An aspect of the invention is an improved method for servicing a gear assembly having a gear segment and a spider for supporting the segment. The method includes the steps of providing a jack assembly with a jacking bolt mounted for radial outward movement, moving the jacking bolt radially outward, applying a separating force to the segment and disengaging the segment from the spider. Further steps involve providing a drawtight assembly with a coupler attached to the segment, applying a force to the coupler, moving the coupler radially inward and engaging the segment with the spider. Other aspects of the invention include the "jacking" apparatus for separating a segment from the spider (for service purposes) and the "drawtight" apparatus for re-attaching the segment to the spider. The invention is particularly useful in connection with large machinery, e.g., a walking dragline, involving heavy and/or unevenly-wearing gear parts and difficult field service conditions.

Abstract: A differential in a motor vehicle drive axle includes a barrel shaped case and a ring gear. The case has an outer cylindrical boss and an adjacent smaller inner cylindrical boss. The ring gear has a flat side facing the case, a plurality of self-cutting straight splines around the center of the ring gear, and a counterbore in the flat side concentric with the self-cutting splines. The self-cutting splines have a major diameter corresponding to the diameter of the inner boss so that when the ring gear is forcibly moved to an assembled position on the case, the self-cutting splines form in situ on the inner boss a plurality of mating straight splines in mesh with the self-cutting splines. The depth of the counterbore is coordinated with the length of the inner boss to achieve penetration of the outer boss into the counterbore at the time the self-cutting splines engage the inner bore so that a closed chip trap is defined ahead of the self-cutting splines.

Abstract: The invention is an improvement in a gear assembly having a gear segment attached to a spider. The improvement comprises a pair of spaced spider webs and a segment-attached mounting member received between the webs. The mounting member has a pair of spaced plates, one plate against each web. Each of a group of tube-like generally cylindrical segment coupling members extends between a particular web and its adjacent plate while each of another group of coupling members extends between the other web and its adjacent plate. The coupling members of a group are in opposed relationship to corresponding coupling members of another group. A bolt-like retaining member extends through each pair of opposed coupling members (with clearance therebetween) and prevents such members "working" out of position.

Abstract: An improved tumbler for use in pad driven machinery or the like utilizes a plurality of replaceable wear members mounted to a reel assembly on the conventional tumbler hub. The wear members engage the cleats of the pads to impart relative motion and bear the brunt of the wear generated thereby. The wear members are designed to wear faster than the cleat or reel assembly and are mounted for relatively easy replacement, thus eliminating replacement of worn tumblers.

Abstract: An adjustable timing gear arrangement having an output shaft and a camshaft operable in timed relationship with the output shaft comprises a first rotatable drive member driven by the output shaft with a second rotatable drive member mounted on the camshaft and operably connected with the first drive member for rotation in timed relation therewith. The second drive member is mounted on the camshaft for rotation on a common axis with the second drive member and the camshaft and is secured thereto to fix the angular relationship of the members. The mounting permits limited relative angular rotation of the members when the members are not so secured. For adjusting the relative angular positions of the second drive member and the camshaft there is an assembly including an unthreaded, cylindrical stud extending from the camshaft into a radially extending slotted opening through the second drive member. The opening includes angularly spaced, parallel sides.

Abstract: An elastomeric torsional isolator comprises one or more elastomer layers disposed between a spur gear, having a pair of sloped surfaces, and a pair of rims having corresponding surfaces. The rims are attached to a flange extending from a shaft which has pinions for engaging a driven gear. By preloading the elastomer layers, the spur gear is frictionally connected to the flange and shaft, rather than mechanically engaged. The preloaded elastomer layers act as an elastomeric torsional isolator which accommodates variations in mechanical tolerances to balance the torque loading in a split torque drive system. Using elastomer layers for balancing the torque loading between a pair of torque splitting gear assemblies reduces the number of bearings required, increasing reliability and reducing part complexity.

Abstract: The present invention is utilized for demountable securing a power take-off ring gear to the clutch drum on the clutch housing of a vehicular transmission. Specifically, a mounting sleeve releasably secures the power take-off ring to the clutch drum. The mounting sleeve has a generally annular body portion configured as an alternating series of circumferentially spaced, radially outer, crown plate portions and circumferentially spaced, root plate portions displaced radially inwardly with respect to the crown plate portions. The crown plate portions and the root plate portions are connected to each other by a series of substantially radially oriented web walls to present a circumferentially extending, corrugated configuration to the mounting sleeve, and the corrugated configuration operatively effects the driving engagement between the sleeve and the clutch drum. A series of first locking dogs extend radially inwardly from at least selected crown plate portions.

Abstract: A linear actuator comprising a stepping motor having a hollow motor shaft prevented from moving in a thrust direction and a flange on either shaft end, a screw extending through the hollow shaft, a nut connected to the motor shaft with a coupling and rotated to linearly move the screw. A plate member is mounted upon screw and a bar so as to connect them to each other, said screw and said bar passing through and being supported by a motor flange, said bar moving through a bearing of a holder mounted to the plate member such that the holder is in parallel to the screw.

Abstract: A transmission for controlled equipment consists of a pair of intermediate gears in mesh with an input gear, another pair of intermediate gears in mesh with an output shaft and a pair of intermediate shafts, each connecting one of the intermediate gears engaged with the input gear and one of the intermediate gears engaged with the output gear, thus forming a pair of gear trains, wherein one of the intermediate gears is loosely mounted on one of the intermediate shafts and is also made fixable by a fixing means, the intermediate shaft and the intermediate gear in the loosely coupled condition are slightly turned in opposite directions so that the gear train made up of the input gear, the intermediate gears on one side and the output gear and the other gear train made up of the input gear, the intermediate gears on the other side and the output gear have no backlash between the gear teeth surfaces of the input gear and the intermediate gears with respect to the power driving directions which are opposite for th

Abstract: A rotary assembly for rotating a vessel such as a rotary kiln with a minimum amount of heat transfer to the driving element. A pluraltiy of coupling assemblies are provided which include a first bracket attached to the vessel. Pivotally connected to the bracket is a link member having an opposite pivot point on the driving element. With the coupling arrangement, heat from the inner rotating element which causes different rates of thermal expansion with respect to the girth gear does not produce high stresses on either element.

Abstract: A four-wheel drive system for use in a vehicle includes mechanisms for preventing disengagement of the engagement sleeves of a transfer gear shift mechanism while permitting limited displacement of the engagement sleeves, shift forks and fork shafts to prevent a large amount of friction between grooves in the engagement sleeves and engagement fingers of the shift forks. Disengagement of the engagement sleeves is prevented by formation of chamfers and tapered surfaces on corresponding portions of the engagement sleeves, splines and sprockets. Limited displacement of the engagement sleeves, shift forks and fork shafts is accomplished by means of notches in the fork shafts which are larger than corresponding locking pins, so that the fork shafts, shift forks and engagement sleeves are displaceable within a distance corresponding to the difference in size between the notches and locking pins.

Abstract: Lightweight ring gear for an epicyclic gear differential. The ring gear is fastened to a radially outwardly extending flange and includes inner and outer perimeters and a surface which is adapted to abut the flange. There are a plurality of equidistantly spaced apart cavities in the surface which extend from the inner perimeter toward the outer perimeter.

Abstract: There is disclosed a hand-held labeler with a thermographic print head for printing on labels releasably secured to a carrier web, a delaminator for delaminating printed labels, an applicator for applying printed labels, a web feeding mechanism including an electric motor for advancing the carrier web, a detachable handle containing a source of electrical energy, and circuitry including a plurality of printed circuit boards electrically connecting the electrical energy source, the keyboard and the print head.There is also disclosed a process of making a feed wheel for the labeler which includes molding a hub having external axial grooves, molding feed rings having external tooth and internal projections which are cooperable with the grooves in the hub in only one rotational position, and sliding the rings onto the hub.

Abstract: A robotic manipulator wrist has one part 10 rotatable relative to the other part 12 of the wrist, and gear trains 16, 18, 20, operates to rotate the end effector shaft 14 when a brake 36 is applied to prevent relative movement between the two parts 10 and 12, and to rotate one part 10 relative to the other part 12 when a second brake 38 is applied to prevent relative movement between the end effector gear 18 and the intermediate gear 16.

Abstract: A rotary drum having a toothed rim arranged on the drum casing and supported at several peripheral points on the drum casing by evenly distributed bridge members. Each bridge member includes two clips axially spaced from one another and welded to the drum casing and a cross plate which connects the clips and is radially spaced from the drum casing. Each cross plate is rigidly connected to one clip and slideably connected in the axial direction to the other clip so that differing degrees of thermal expansion and resulting deformation of the cross plates and further strain on the cross plates, clips and connection points can be compensated for.

Abstract: Disclosed is a crank for a bicycle, having a chain wheel mounted thereto by an adapter, the adapter having at least one annular member formed at the foremost ends of legs extending radially outwardly of a boss of the adapter and connecting the legs with each other and chain wheel mounting means provided at at least one of the leg and adapter.

Abstract: A drive wheel and sprocket assembly for use in the power transmission of a conveyor device such as a roller conveyor comprises a drive wheel which is mounted on the hub of a sprocket assembly. The drive wheel mounts the hub with a modified spline connection in which a plurality of radially overhanging teeth on the drive wheel are resiliently interlocked with shoulders formed in the assembly hub. In a preferred embodiment, the drive wheel is molded of polyurethane.

Abstract: The invention pertains to a bicycle drive sprocket hub which may be universally utilized with a plurality of bicycle chain sprockets of different manufacturers. The hub is preferably formed of a synthetic plastic material and is provided with a plurality of flat locating surfaces intersected by shoulder surfaces which cooperate with locating surfaces defined upon the chain sprocket. Openings are formed in the hub for receiving fasteners for affixing the sprocket thereto.

Abstract: A sprocket-wheel, gear-wheel or like wheel, substantially manufactured of a synthetic material, comprising a hub which is divided along a plane which lies perpendicular to the center line of the hub-boring, said hub parts being provided with adjacent recesses for jointly accommodating a toothed ring member and being affixed to one another by bolts or the like to clamp the toothed ring member therebetween.

Abstract: A chain gear for a bicycle is formed from an approximately rectangular metallic band-shaped plate which has gear teeth formed along one edge and which is equal in length to the peripheral length of the chain gear. The band-shaped plate is wound into a ring-shape and end portions of the band-shaped plate are secured together to form the chain gear. The chain gear is secured to a chain gear adapter of a bicycle by a fixing means, the adapter rotating in accordance with a pedalling operation.

Abstract: Apparatus for mounting a rotatable component on a rotating shaft using a non-machined torque transmitting intermediate hub member is disclosed. The hub member makes torque transmitting contact with the drive shaft and transmits that torque to the rotatable component through frictional contact at a taper on the drive shaft and at a recessed shoulder of the hub as well as by an external key on the hub periphery and a matching cut-out formed in the rotatable member. There is also a keyway and key between the drive shaft and hub for accurate alignment in assembly and disassembly. A plurality of narrow longitudinally extending rib members are integral with and are supported on the other peripheral surface of the hub member whereby the rotatable member when it is seated against the shoulder on the hub member for the first time mechanically distorts the rib members from their original shape to provide a secure but releasable fit between the hub member and the rotatable component.

Abstract: A gear comprises a hub and a gear ring mounted thereon, each formed with peripherally spaced apertures and interlocking elements extending peripherally between adjacent apertures to hold the hub and gear ring against axial movement relative to each other. The apertures of the hub and gear ring register. Torque is transmitted between the hub and gear ring by a plurality of first abutments on the hub which have radially outwardly facing surfaces adjoining respective apertures therein, a plurality of second abutments on the gear ring which have radially inwardly facing surfaces adjoining respective apertures therein and radially aligned with respective outwardly facing surfaces, and a plurality of prestressed elastomeric spring elements disposed in the registering apertures. Each spring element engages the radially aligned surfaces and is retained in the apertures by a retaining disc secured to the hub and engaging the spring element on one side of the gear.

Abstract: A bicycle sprocket wheel comprises a toothed outer annular member molded of a tough nylon plastic and a centrally disposed metal spider having a plurality of radial arms attached to the sides of the annular member to add structural rigidity thereto. The teeth of the annular member are formed with straight front and back faces and with sharp corners at the roots thereof. Such a construction reduces the cost of the mold used for molding the annular member since the cavity needed therein for the teeth can be simply machined by use of straight and circular cuts. The inner radial edge of the annular member is shaped by an insert in the mold to form sets of circumferentially spaced arcs, the arcs of each set having a common radius different from the other sets to accomodate spiders having arms of different radial lengths.

Abstract: A drive wheel assembly for a machine tool of the band saw type comprises a rim section adapter to engage and drive an endless saw or the like and a hub section removably attached to the rim section. The rim section is provided with internal gear teeth adapted to engage a driven pinion gear, while the hub section contains a central hub adapted to engage a shaft about which the assembly rotates.

Abstract: A chain drive sprocket formed of a plurality of sprocket segments arranged seriatim alternately to define a continuous equiangularly spaced annular series of sprocket teeth with a first group of the sprocket segments having a different number of teeth from the alternating second group. Each of the segments may have a similar number of mounting bolt holes, which, in the circular sprocket arrangement, are equiangularly spaced about the axis of the sprocket. The sprocket segments are of different angular extent and the end bolt holes of different sprocket segments may be spaced differently from the end surfaces of the sprocket segments. The sprocket radii centered between opposed adjacent end surfaces may be angularly spaced from the radial centerline through the root between the end teeth of the sprocket segments at opposite sides of the adjacent end surfaces.

Abstract: Spur gears of which the engagement is made noiselessly because of three adjustment functions wherein the central errors of the gears as rotary bodies are compensated by specific method of freeing the wheel center of a gear in a train of gears. The foundation parts (rim parts) of the gear teeth are subjected to qualitative treatment so as to have a large elasticity against maximum bending. The moment of forces working on said teeth are made to have a ring shape and the gears are arranged to have a large backlash. The holding mechanism is constructed so that the rotational center of the ring-shaped gears may be slightly movable in relation with the rotation center of the gear shaft. Backlash due to excessive vibration of the wheel center is prevented by providing a P.C.D.

Abstract: A joint is provided for a gear which has a hub and a peripheral toothed portion. The toothed portion is positioned about the hub for mating an associated gear and rotates in a preselected plane. The joint connects the hub and toothed portion of the gear and absorbs motion.

Abstract: An improved worm wheel which is capable of mating with a worm includes a base portion and a wear portion. The wear portion loosely encircles the base portion with mating teeth therebetween, there being a greater number at the interior of the wear portion than at the exterior of the base portion. The wear portion also includes an array of teeth at its outer surface for engaging the worm.

Abstract: A sprocket, gear or pulley having an interchangeable peripheral portion for replacement. The device has a hub with an axial boss, an annular member having teeth or a groove along its outer rim and located concentrically on the boss, and a cap to hold the annular member immovable on the boss. The annular member may be segmented. The inner rim of the annular member and the boss may be threaded or splined for interengagement.