Abstract: A cog belt pulley system includes cog belt pulleys (10a to 10c) each with at least one flange (15 to 17) protruding in the radial direction beyond the toothed circumferential surface (11) and extending in the circumferential direction to limit slipping of the belt (20, 30, 40) at right angles to the circumferential direction of the pulleys (10a to 10c). Said flange is provided only as a segment over a limited part of the circumferential surface in the circumferential direction of the pulleys. A belt is mounted on two pulleys by the pulleys being rotated into a position in which the particular flange segments face each other. In this position the belt can be pushed onto the pulleys without colliding with the flange segments.

Abstract: A sprocket for supporting and propelling an endless track assembly of a track-type machine. The sprocket has an endless chain which is resiliently mounted to an outer flange of a hub. The chain has outwardly projecting teeth that interact with the endless track assembly to propel the machine. A plurality of drive assemblies are pressed between the endless chain and the flange to resiliently connect the endless chain to the flange of the hub.

Abstract: A chamfered sprocket assembly for facilitating the shifting of a drive chain from a larger sprocket to a smaller sprocket is disclosed. In a preferred embodiment, the chamfered sprocket assembly includes a sprocket having a plurality of chamfered portions on a side facing a smaller sprocket, each chamfered portion located between a pair of toothlike projections located on the rim of the sprocket body. The chamfered portions preferably include a crest which tapers toward a first edge and a second edge of the chamfer portion, respectively. The crest is preferably offset from the center of the chamfer portion toward the driving direction of the sprocket assembly. To further facilitate the shifting of the drive chain, the sprocket preferably includes a rounded shoulder to guide the movement of the drive chain. Finally, the friction between the toothlike projections and the drive chain is reduced by polishing the toothlike projections.

Abstract: A power transmitting mechanism includes a first silent chain trained around teeth of a first driving sprocket and a teeth of first driven sprocket, and a second silent chain trained around teeth of a second driving sprocket and teeth of a second driven sprocket. The first and second driving sprockets are mounted in parallel relationship on a single drive shaft, and the teeth of the first driving sprocket are offset from the teeth of the second driving sprocket by one-half pitch. The pitch of the driving sprockets is a random pitch which varies in a random pattern along the circumference of the sprockets. The silent chains have a single pitch. By thus phasing the two driving sprocket, periodic meshing impact sounds emitted from the respective silent chains are canceled out or offset each other. The periodicity of the meshing impact sound is agitated by the random tooth pitch of the driving sprockets to such an extent that resonance sound is sufficiently reduced.

Abstract: This invention comprises a multi-sprocket or cluster gear assembly with a plurality of progressively sized sprockets or gears that are positioned adjacent to each other so as to define an increasing diameter sprocket assembly. Each sprocket comprises a non-circular configuration having at least one long dedendum radius and at least one short dedendum radius, such as an eccentric oval shape. The short radius and the long radius of two adjacent sprockets are aligned and substantially equal in length with each other. The teeth of the sprockets may comprise a chamfer face to better facilitate derailing from one sprocket to the adjacent sprocket. The axial alignment of one sprocket may be retarded by one tooth, relative to the axial alignment of the larger sprocket to better facilitate derailing.

Abstract: A waste water treatment system for removing sludge from within a rectangular clarifying tank having a plurality of sludge collector flights attached to a pair of parallel chains for collecting sludge and scum within the waste water. Each of the collector flights includes a non-metallic elongated main body portion having spaced top and bottom walls connected by spaced front and rear walls for defining a hollow, interior cavity. Buoyant foam material is disposed within the interior cavity for increasing the buoyancy of the collector flight. The waste water treatment system further includes plastic bull and drive sprockets mounted to a drive shaft running across the width of the tank, and a chain drive assembly for driving a pair of parallel drive chains attached to the drive sprockets. The drive assembly causes rotation of a drive shaft through a chain link attachment to the bull sprocket.

Abstract: A chain and sprocket system includes a plurality of chains and phased or offset sprockets. Problems related to equalizing or sharing the load between the driven sprockets in a multiple axis, phased system are eliminated by providing sprockets that rotate independently of one another and having only one of those sprockets transmit load or power to the driven shaft.

Abstract: A guide sprocket assembly for use in combination with a non-driven, rotating tail shaft. The guide sprocket assembly includes a lock plate assembly securely fixed to the tail shaft for rotation along with the tail shaft. The lock plate assembly includes an annular sprocket groove that receives an annular guide sprocket having a plurality of projecting teeth spaced along its outer circumference. The guide sprocket is retained within the annular sprocket groove by a sprocket retainer. The combination of the guide sprocket and sprocket retainer are freely rotatable within the annular sprocket groove relative to the lock plate assembly. The teeth of the guide sprocket engage a drive chain, and the guide sprocket can rotate either in the direction of rotation of the tail shaft or in an opposite direction to properly align the individual links of the drive chain with the teeth formed on the guide sprocket.

Abstract: A sprocket includes a body, and teeth formed on the peripheral edge of the body. The teeth have a thickness greater than that of the body. This design enables the use of an existing chain and brings about a reduction in the weight of the overall sprocket.

Abstract: A multiple sprocket assembly includes one or more sprocket subassemblies. Each sprocket subassembly includes a spider-type sprocket support which supports first and second sprockets. The sprocket support includes a boss and a plurality of supporting arms extending radially outward from the boss. Each supporting arm includes a first mounting surface and a second mounting surface opposite the first mounting surface in an end region of the supporting arm. The first sprocket is mounted to the first mounting surface of each supporting arm, and the second sprocket is mounted to the second mounting surface of each supporting arm. A difference between a number of teeth on the first sprocket and a number of teeth on the second sprocket is small, e.g., from one to three teeth.

Abstract: A belt drive assembly for driving a continuous belt having a plurality of drive teeth openings includes a drive shaft, a belt support surface and a plurality of drive teeth. The belt support surface is movably supported relative to the drive shaft so as to move substantially independent of the drive shaft. The plurality of drive teeth are coupled to the drive shaft and extend outwardly from the drive shaft beyond the support surface for being received within corresponding drive teeth openings of the belt.

Abstract: A bicycle sprocket includes a sprocket body having a first lateral side surface, a second lateral side surface opposite the first lateral side surface, and an inner peripheral surface. A plurality of teeth extend radially outwardly from the sprocket body and define a corresponding plurality of chain connector receiving spaces with a corresponding plurality of bottom edges between each pair of adjacent teeth, wherein each bottom edge receives a chain connector therein. The first lateral side surface defines a first recess extending radially inwardly from selected ones of the plurality of bottom edges, and the first lateral side surface defines a second recess extending radially inwardly from other selected ones of the plurality of bottom edges and spanning their corresponding pairs of adjacent teeth.

Abstract: In accordance with the teachings of the present invention, a waste water treatment system for removing sludge from within a rectangular clarifying tank as provided. The waste water treatment system includes a plurality of sludge collector flights attached to a pair of parallel chains for collecting sludge and scum within the waste water. Each of the collector flights includes a non-metallic elongated main body portion having spaced top and bottom walls connected by spaced front and rear walls for defining a hollow, interior cavity. Buoyant foam material is disposed within the interior cavity for increasing the buoyancy of the collector flight. The waste water treatment system further includes integrated plastic bull and drive sprockets and a chain drive assembly for driving a pair of parallel drive chains attached to the integrated plastic bull and drive sprockets. The chain drive assembly includes dual drive shafts exterior to the waste water with each extending across half the width of the tank.

Abstract: This invention relates to a chain drum arrangement for a central or double central scraper chain conveyor, comprising a divided chain wheel, the shell-type chain wheel segments of which are attached, locked in rotation and detachably, via an axial splined portion to the shaft, wherein the chain wheel is secured in its installed position on the shaft by means of locking rings disposed on both sides and at least one of these two locking rings consists of a divided locking ring which can be taken off radially from the shaft in order to remove the divided chain wheel from the shaft. According to the invention, the divided locking ring is disposed as an intermediate ring between the divided chain wheel and a hollow journal which receives the respective shaft bearing and which projects axially from the respective side cheek of the machine frame into the interior space thereof, which results in a narrow mode of construction of the divided locking ring.

Abstract: A bicycle sprocket set is composed of a small sprocket and a large sprocket coaxial with the small sprocket. The large sprocket is provided with an axially oriented recess in the bottom portion located between the first tooth and the second tooth of the large sprocket. The recess has a support curved face extending from the second tooth. The large sprocket is further provided with a support protrusion located under the support curved face such that the support protrusion is separated from the support curved face by a distance corresponding to about one tooth pitch. The support curved face and the support protrusion serve to support the inner and the outer chain plates of a drive chain at such time when the gearshifting takes place.

Abstract: In accordance with the teachings of the present invention, a waste water treatment system for removing sludge from within a rectangular clarifying tank as provided. The waste water treatment system includes a plurality of sludge collector flights attached to a pair of parallel chains for collecting sludge and scum within the waste water. Each of the collector flights includes a non-metallic elongated main body portion having spaced top and bottom walls connected by spaced front and rear walls for defining a hollow, interior cavity. Buoyant foam material is disposed within the interior cavity for increasing the buoyancy of the collector flight. The waste water treatment system further includes integrated plastic bull and drive sprockets and a chain drive assembly for driving a pair of parallel drive chains attached to the integrated plastic bull and drive sprockets. The chain drive assembly includes dual drive shafts exterior to the waste water with each extending across half the width of the tank.

Abstract: A crankset assembly employing a steel spider construction without adding excessive weight, and accommodating virtually unlimited combinations of bolt circle diameters and types of chain rings that include the crankset assembly. The crankset assembly may include a crank arm, a spindle piece attached to the crank arm, a radially extending spider fixed to the crankset assembly, at least two chain rings supported on the crankset assembly by the spider, and a plurality of connector elements attached to the spider at a corresponding plurality of spaced positions about the spider central axis. At least one of the chain rings is mounted to, and solely supported by, the plurality of connector elements.

Abstract: Derailleur with at least two sprockets on a sprocket set which is located around a pedal axle of a bicycle, which sprockets are provided with chain transfer assistance measures to assist the transfer of the chain in upshifting or downshifting, whereby the shifting can be done under load in both of these directions. The chain transfer assistance measures comprise a tooth space with a spiral-shaped base, a conical rivet with an encircling sharp edge to locate the chain in the vicinity of its links between the chain plates, as well as bevels, recesses and steps, the totality of which optimize the chain transfer in both directions between sprockets which are coordinated with one another.

Abstract: A multi-speed sprocket assembly of a bicycle includes at least a small sprocket and a large sprocket which enable the chain to engage with different sprockets to attain the chain shifting effect by the guidance of the rear derailleur device. The improvement of the multi-speed sprocket assembly includes three feature teeth being furnished at both the large sprocket and the small sprocket wherein a side recess is formed on each of the feature teeth at the surface of a sprocket facing another sprocket, in addition, at the first and second feature teeth of the small sprocket, there is a circular top end recess extended from the top of the teeth at the surface subjected to forces and penetrated through the circular top end recess of the whole teeth.

Abstract: A sprocket assembly includes a larger diameter sprocket having a plurality of teeth formed on an outer periphery thereof, and a smaller diameter sprocket having a plurality of teeth formed on an outer periphery thereof. A driving chain meshes with the plurality of teeth of the smaller diameter sprocket and is able to shift from a first center of a space defined between the teeth of one pair of adjacent teeth located at the smaller diameter sprocket to a second center of a space defined between the teeth of one pair of adjacent teeth located at the larger diameter sprocket. A distance between the first and second centers is made not equal to an integer multiple of the pitch of the driving chain such that the driving chain is bent between the first and second centers and is deflected from a moving direction thereof which is along a tangent line drawn from the first center of the smaller diameter sprocket, and such that the driving chain has a deflection point relative to the first and second centers.

Abstract: A bicycle crank driven chain wheel assembly uses a special-shaped chain wheel. The chain wheel has portions of different driving radii. The portion having smaller driving radii is engaged in transmission when the bicycle runs on slopes, so that the bicycle rider can drive the bicycle with smaller force. The portion having larger driving radii carries out transmission when the bicycle runs on flat road, so that the bicycle can be speeded up. The crank is mounted in such a manner that it can rotate with respect to the chain wheel within predetermined range of angle, so as to select the corresponding portion of the chain wheel to be engaged in transmission in accordance with the resistance to motion of the bicycle or with the condition of the road on which the bicycle runs. Thus, a variable transmission can be automatically achieved corresponding to the resistance to motion of the bicycle or to the condition of the road.

Abstract: Disclosed is an improvement on bicycle freewheel gear cluster gear-shifting mechanism having at least at least a large-diameter sprocket wheel, an intermediate-diameter sprocket wheel. The improvement includes a plurality of protrusions provided on the rim of the large-diameter sprocket wheel on the side facing the intermediate-diameter sprocket wheel. The plurality of protrusions can be used to prevent the drive chain from overshooting to the large-diameter sprocket wheel when the drive chain is being shifted from the small-diameter sprocket wheel to the intermediate-diameter sprocket wheel. Additionally, a plurality of protrusions are provided on the rim of the large-diameter sprocket wheel near the gear-up assistant hooking members. The plurality of protrusions can be used to prevent the drive chain from being hooked up by the gear-up assistant hooking members when the drive chain is being shifted from the large-diameter sprocket wheel down to the small-diameter sprocket wheel.

Abstract: A height adjustable stand for laboratory equipment, in particular for rotary evaporators, possesses a holder arrangement (6). The holder arrangement is able to be displaced vertically on a stand post (5). By way of a motor driven lifting arrangement (9, 11), the holder device (6) can be vertically raised or lowered. A coupling (12) is provided between the holder arrangement (6) and the lifting arrangement (9, 11) for the powered connection and its release.

Abstract: A bicycle multi-step transmission sprocket assembly includes a large sprocket gear, an intermediate sprocket gear, and a small sprocket gear. The intermediate sprocket gear is provided in the top surface of a predetermined tooth with a first recess and is further provided with a chain guiding slot located in the back side of a plurality of adjoining teeth along the reverse revolving direction of the predetermined tooth. The large sprocket gear is provided in the top surface of a predetermined number of teeth thereof with a second recess corresponding in location to the chain guiding slot of the intermediate sprocket gear in the reverse revolving direction. The sprocket chain is capable of shifting from the small sprocket gear to the intermediate sprocket gear with speed, thanks to the first recess and the chain guiding slot of the intermediate sprocket gear.

Abstract: Drive sprocket assembly for chain saws, where a saw chain runs around a loose drive ring that rolls upon cylindrical surfaces of a drive sprocket. Drive links of the saw chain project through holes of the drive ring and enter recesses of the drive sprocket to be driven thereby. The recesses of the drive sprocket have an axial dimension substantially larger than the thickness of the drive links, to enable the drive ring and chain to have substantial axial play relative to the drive sprocket.

Abstract: In a pocket chain wheel having two groups of pockets (1) for chain links (5) passing the wheel at a tilt, said groups of pockets being arranged side by side in a view perpendicular to the wheel axis (3), the bases (2) of the pockets (1) are shaped such that those legs (4) of the chain links (5) which face the wheel axis (3) are supported, within the pockets (1), only in the curved regions of the transition of the nose ends (6) of the chain links (5) into their legs (4) respectively facing the wheel axis (3). In this way, the stress upon those legs (4) of the chain links which face the wheel axis (3) is significantly relieved and an increase achieved in the service life of said chain links.

Abstract: A multistage sprocket mechanism includes one or more sprockets each having two groups of teeth alternatively formed in the peripheral portion. The sprockets each includes two surfaces having a number of recesses and depressions alternatively formed in the peripheral portion and arranged close to the groups of the teeth. The recesses and the depressions each has a tapered bottom arranged corresponding to the respective groups of teeth for engaging with the driving chain and for reducing a friction between the driving chain and the sprockets.

Abstract: A freewheel of a bicycle includes a number of sprockets engaged on a sprocket ring. An outer thread is formed in the outer portion of the sprocket ring for engaging with a lock nut. The lock nut includes a number of serrated teeth formed on one side surface. An outermost sprocket includes an outer surface having an annular shoulder so as to define an annular surface. The annular surface includes a number of serrated teeth for engaging with the serrated teeth of the lock nut so as to solidly and stably securing the sprocket to the lock nut.

Abstract: A composite gear member and gear set using the composite gear member is provided. The composite gear member is formed of a generally circular disk having a pair of link plate supporting surfaces separated by a central section. A roller chain which includes a plurality of rollers rotatably mounted on support pins extends between link plates. The chain is reeved around the disk with the link plates being supported in the grooves on the link plate supporting surfaces. Retaining devices in the form of retaining plates or pins are connected between the chain and the disk to restrain circumferential movement of the chain with respect to the disk. This also prevents circumferential slipping of the chain.If the mounting of the chain on the disk is by a retaining plate device engaging the link plate, a single strand of chain is utilized to form the entire gear member, with the second toothed gear being arranged to drivingly engage the rollers.

Abstract: A sprocket assembly for a bicycle having a large sprocket and a small sprocket. The large sprocket includes chain support projections formed on the side surface opposed to the small sprocket. Each projection includes a contact portion defining a contact surface for contacting, without meshing, a lower end of a chain shifted from the small sprocket to the large sprocket. The chain support means are arranged for causing the contact surface to contact the chain engaging the small sprocket and pick up the chain radially outwardly of the large sprocket during a chain shift from the small sprocket to the large sprocket.

Abstract: A synchronous drive belt for use in low speed and high torque applications has a zero pressure angle over a relatively greater portion of the fore and aft flank surfaces of the belt teeth. A pulley is also described which is particularly suitable for use in combination with the belt.

Abstract: Split sprocket wheels having interlocking tabs for forming a sprocket wheel assembly that is easy to install on and remove from a drive or idler shaft of a belt or chain conveyor. The invention provides thin, durable sprocket wheels split into at least two sectorial sections along seams extending from a central bore to an outer engagement surface. Mating tabs and receptacles at the edges of adjacent sectorial sections interlock the adjacent sections radially and circumferentially. Holes in the vicinity of the mating tabs and receptacles of adjacent interlocked sections admit locking means for holding the sectorial sections together in axial compression. The sprocket wheels can be ganged together at selected positions along a shaft with their bores in coaxial alignment by means of spacers interconnecting consecutive sprocket wheels along the shaft.

Abstract: A convertible sprocket for film and like media accommodates different media formats. The sprocket includes a first sprocket wheel support and a first sprocket wheel having a first dimension and supported by the sprocket wheel support. A second sprocket wheel support is co-axial with the first sprocket wheel support. A second sprocket wheel having a second dimension different from the first dimension is supported by the second sprocket wheel support. The second sprocket wheel is axially movable relative to the first sprocket wheel support so that the first sprocket wheel engages the medium when the second sprocket wheel is in a first position relative to the first sprocket support. The second sprocket wheel engages the medium when the second sprocket wheel is in a second position relative to the first sprocket support. The convertible sprocket has a plurality of axially spaced apart sprocket wheel wherein at least two of the sprocket wheels have different diameters.

Abstract: A sprocket for a chain including a thick hub portion and a plurality of thinner sprocket rings mounted on the hub. The hub has a rounded polygon peripheral configuration and the rings have complementary bores to receive the hub. The rings have sprocket teeth defined about their outer edges. When the sprocket rings are mounted in face-to-face nesting arrangement on the hub the teeth on adjacent sprocket rings are aligned axially of the hub. A pair of side plates having a greater diameter than the sprocket rings confine the rings on the hub and aid in holding a chain thereon during operation.

Abstract: A bicycle rear-wheel hub includes an inner casing disposed in the hub at one side, an outer casing disposed on the inner casing, an axle inserted through the hub and a set of flywheels disposed on the outer casing. The hub includes an inner thread and a wheel shoulder at one end, and a rubber ring set inside the wheel shoulder in front of the inner thread. The inner casing has an outer thread at one end for engaging with the inner thread of the hub. The inner casing also has a tool hole at the opposite end for inserting a tool. The outer casing has a number of elongated grooves around the outer wall surface for fastening the set of flywheels. The flywheels each has a number of inner projections formed in a center hole for engaging with the elongated grooves of the outer casing.

Abstract: A bicycle power train assembly includes a crank axle, a primary driving sprocket cluster mounted on one end of the crank axle, a rear wheel axle, a primary driven sprocket cluster mounted on one end of the rear wheel axle, a primary drive chain trained between the primary driving and driven sprocket clusters, a secondary driving sprocket mounted on the other end of the crank axle and rotating with the crank axle, a secondary driven sprocket mounted on the other end of the rear wheel axle, a secondary drive chain trained between the secondary driving and driven sprockets, an idle sprocket rotatably mounted on the rear wheel axle, and a ratchet clutch disposed between the rear wheel axle and the secondary driven sprocket to disengage the secondary driven sprocket from the rear wheel axle when the primary drive chain is trained between the primary driving and driven sprocket clusters and to engage the secondary driven sprocket and the rear wheel axle so as to drive rotatably the rear wheel axle when the primary

Abstract: Sprocket drive mechanisms formed of metal lamina engage belt drive surfaces formed in a modular plastic conveyor belt. The lamina are positioned axially along a rotary drive shaft to mate with drive surfaces extending across the width of the belt. Belt wear from the metal sprocket lamina is reduced by floating at least one lamina axially along the drive shaft to conform with belt positioning under loading and other dynamic conditions. Spacers for axially separating the lamina for registration with belt drive surfaces when mounting the belt on the sprocket drive may be removed after registration, thereby keeping the metal drive assembly lighter with less inertia to further reduce wear. Alternatively light weight laminar spacers disposed axially along the shaft are interlocked to the sprocket lamina to maintain a fixed spacing while permitting the assembly and/or separate sprocket lamina to float axially on the shaft.

Abstract: A flexible tape drive system of the type having a flexible yet relatively longitudinally rigid perforated drive tape which is reciprocated by a toothed cog drive arrangement to provide both push and pull driving power. The drive system includes a substantially circular cog wheel having an outer base surface of a predetermined diameter and a plurality of radially extending cog teeth spaced about the periphery of the outer base surface. A cog wheel surround includes an outer guide track having an inner cog race with an inner surface of a diameter slightly larger than the base diameter of the cog and spaced substantially parallel therewith. A pair of oppositely disposed peeler tips are situated adjacent the top of the cog wheel surround between the outer guide track and the cog wheel, each including a peeler edge which has an arcuate inner face extending from the edge at a non-parallel orientation relatively to the base surface of the cog.

Abstract: A belt tensioning device for a belt driven bicycle that includes a tension plate having triangular positioned orifices. The plate is pivotally mounted to the frame with one of the orifices. Rollers are mounted in the other two orifices and the drive belt passes between the roller. When the belt tightens against one of the rollers, it pivots the tension plate, forcing the other roller into the belt and preventing any slack from occurring.

Abstract: Linear velocity corrective device for chains (11) driven by toothed wheels (14), advantageously toothed wheels (14) with few teeth, for closed looped chains (11) extending in a plane or subvertical, operating near the joining zone of said chain (11) with said toothed wheel (14) and comprising levelling means (16-26-28) for the levelling of the links (12) according to the tangent to the circumference created by the pitch diameter (DP) of said toothed wheel (14) and operating upstream of the vertical of the rotation axis (15) of said toothed wheel (14).

Abstract: A variable speed-type bicycle chain ring assembly includes a hub member having a plurality of angularly spaced radial arms which are stepped at a front side of the hub member so as to form at least two mounting sections that are spaced at different radial distances from a center point of the hub member. The mounting sections of the radial arms are circumferentially aligned. The thickness of the mounting sections increases from an outermost end to an innermost end of the radial arms. The bicycle chain ring assembly further includes at least two concentric sprocket ring members of different diameters. The sprocket ring members are mounted on the hub member at a respective one of the mounting sections.

Abstract: A pulley is described for hauling strands of rope or chain and for engaging a splice coupling a strand of rope to a strand of chain. A plurality of pockets are arranged about the periphery of the pulley for positively engaging every other chain link. A plurality of pairs of rope-engaging surfaces are located between adjacent pockets and within the pockets. Rope and chain occupy substantially the same diameter of the pulley resulting in substantially the same speed and torque characteristics whether rope or chain is being hauled.

Abstract: A multi-stage sprocket assembly for a bicycle is disclosed. In the assembly, a concave portion is provided in a small-sprocket-side face of a large sprocket for avoiding interference with a drive chain disengaged from a height-reduced tooth of the large sprocket, such that a link-connecting portion of the chain is received at a dedendum or a stepped portion of the large sprocket. Teeth of the small sprocket is phase-arranged with the receiving portion of the large sprocket such that a portion of the chain extending substantially straight rearwardly in a drive rotation direction of the sprocket assembly from the link-connecting portion of the chain received by the receiving portion of the large sprocket is engageable with a tooth of the small sprocket. The stepped portion receives the link-connecting portion at a position lower than the dedendum.

Abstract: A bicycle multiple chainwheel is provided which is mounted on a pedal crank for transmitting a rider's pedalling force to a rear gear through a chain. The chainwheel has the following configuration to prevent a chain from being locked to a diametrically larger sprocket or from prematurely disengaging from the larger sprocket before completely shifting to a diametrically smaller sprocket.The larger sprocket has circumferentially asymmetric teeth located in at least one of diametrically opposite angular regions which contain a diametrical line of the larger sprocket extending along crank arms of the pedal crank, each of the asymmetric teeth being offset relative to a corresponding pitch center in the forward rotational direction of the chainwheel in comparison with the other normal teeth of the larger sprocket.

Abstract: A reversible sprocket assembly for a chain and sprocket drive system includes a sprocket body having an inner hub portion with a central bore and an outer sprocket drive unit including teeth for engaging a drive chain. A coupling, such as mating splines, is provided along the bore for coupling the sprocket in driving relationship with the drive shaft. The coupling is reversible so that the bore of the hub may be received on the shaft with either end first. A counterbore is provided at each end of the hub adjacent the coupling so as to form end portions of the bore. When mounted on the shaft, one counterbore mates with a first shoulder on the shaft. A removable annular spacer forms a second shoulder to mate with the other counterbore. In this way, the sprocket body is securely supported in driving relationship on the shaft. By reversing the sprocket drive unit as a whole, the trailing faces of the teeth become the new drive faces and the life of the sprocket assembly is essentially doubled.

Abstract: In a multi-speed sprocket assembly for a bicycle having at least one large sprocket with teeth and one small sprocket with teeth disposed adjacent each other and selectively engageable with a drive chain of the bicycle consisting of a series of pivotably connected link plates, the improvement includes a chain receiving portion formed on a reference tooth of the large sprocket so as to receive a connecting portion of the link plates with diametrical clearance from a tooth space bottom of the large sprocket. The teeth of the small sprocket have such phase relationship relative to the chain receiving portion of the large sprocket that a tooth of the small sprocket positioned downstream relative to the reference tooth engages with the chain when the connecting portion of the chain is received by the chain receiving portion of the reference tooth.

Abstract: An endless track assembly for a vehicle includes a support plate having an elongated, horizontal guide slot formed in one end thereof. A support is slidably mounted in a guide groove and an idler sprocket is rotatably mounted on a support. The drive sprocket is rotatably mounted at the other end of the support plate and an endless track is entrained about the two sprockets. A spring is mounted between an abutment on the movable support member and an adjustable abutment member which is secured to the side of the support plate between the two sprockets. A chamber containing pressurized grease is disposed in engagement with the movable abutment to vary the position thereof to vary the force of the spring acting on the idler sprocket to in turn vary the tension of the endless track. A plurality of guide rollers are rotatably mounted in engagement with the endless track on the same side of the support member as the sprockets.

Abstract: The invention is directed to a positively-guided belt drive wherein the drive of the belt by supporting surfaces is decoupled from the drive of the belt via projections. This decoupling is effected with the aid of ball bearings. In a belt drive of this kind, the forces acting on the inner side of the belt are greatly reduced. This leads to reduced wear and to a longer service life. The rate of malfunctions of focal plane shutters of photogrammetric cameras is significantly reduced by this belt drive.

Abstract: A multistage sprocket assembly is provided which includes at least one larger diameter sprocket and at least one smaller diameter sprocket assembled in a relationship such that the center point between a pair of adjacent teeth at the larger diameter sprocket and the center point between a pair of adjacent teeth at the smaller diameter sprocket are positioned on a tangent extending along the chain path when the chain is being shifted from the smaller diameter sprocket to the larger diameter sprocket. The distance between both the center points is equal to an integer multiple of the chain pitch. A chain guide portion is provided at the inside surface of the larger diameter sprocket and at a position corresponding to a moving path of a driving chain traveling between the aforesaid center points for allowing the chain to move axially of the sprocket assembly slightly toward the larger diameter sprocket during shifting.

Abstract: A crop gathering head 10 including crop gathering belt 11, 12 of reinforced elastomeric material and its associated driving sprocket 30 and idler sheave 50 is described. The belt 11 or 12, sprocket 30 and sheave 50 system may be used to convey crops into a combine. The belt 11 or 12 includes a plurality of cleats 20 of elastomeric material on its top surface 18 and a plurality of equally spaced driving lugs 24 of elastomeric material on its bottom surface 19. The sprocket 30 has first and second sides 31, 32 respectively and comprises a plurality of equally spaced apart radially projecting teeth 33 separated by first and second cavities 34, 34' respectively. The first cavities 34 are open only to the first side 31 of the sprocket 30. The second cavities 34' are open only to the second side 32 of the sprocket 30.