Abstract: A bicycle rear wheel sprocket arrangement comprises a carrier sprocket and a self-supporting sprocket cluster connected to the carrier sprocket on the outboard side in a connection region of the carrier sprocket. The sprocket arrangement comprises a plurality of further sprockets which are designed as sprocket rings. The sprocket rings are each arranged on the carrier sprocket in the connection region and each are connected to the carrier sprocket.

Abstract: A plurality of sprockets which are coaxial with respect to a sprocket rotation axis, are arranged with axial spacing from each other and have different numbers of teeth which are constructed for positive-locking engagement with a bicycle chain. The pinion arrangement has a gear range quotient which is formed by division of the number of teeth of the sprocket having the largest diameter by the number of teeth of the sprocket having the smallest diameter, and has a packing density quotient which is formed by division of the number of sprockets in the sprocket arrangement by the axial spacing measured in millimeters of the axially outermost pinions from each other. The pinion arrangement may have a gear range packing coefficient, formed from the product of the gear range quotient and the packing density quotient, which is greater than 1.25.

Abstract: A rear sprocket assembly comprises a first sprocket and a lock device. The lock device includes a first lock member, a second lock member, and a biasing member. The first lock member includes a first axial end and a second axial end. The second lock member includes a third axial end and a fourth axial end. The fourth axial end has at least one radial projection configured to abut against the first sprocket in the axial direction in a mounting state. The biasing member is disposed between the first sprocket and the at least one radial projection in the axial direction in the assembled state to bias the first sprocket and the at least one radial projection in a biasing direction in which the first sprocket and the at least one radial projection are separated from each other.

Abstract: A front sprocket assembly comprises a first sprocket and a second sprocket. The second sprocket includes a second sprocket body and a plurality of second sprocket teeth. At least one tooth of the plurality of second sprocket teeth includes a less chain-interference recess provided to the second axially inwardly facing surface. The less chain-interference recess is configured to reduce interference between the at least one tooth of the plurality of second sprocket teeth and a chain in an upshifting operation in which the chain is shifted from the first sprocket toward the second sprocket. The less chain-interference recess has a radially innermost end positioned radially inwardly from a tooth bottom circle of the plurality of second sprocket teeth. A radial distance radially defined from the tooth bottom circle to the radially innermost end with respect to a rotational center axis is equal to or larger than 1.0 mm.

Abstract: A motor and a torque transducer box, an end cover front panel is installed at a front portion of the motor, the torque transducer box is installed at a front portion of the end cover front panel, a transmission pole is installed in the an extrusion rotating wheel, thermal dissipation and explosion proof boxes are installed on a surface of the motor, a sealing and thermal insulation module is installed at a front portion of the transmission pole, two sets of cable wrapping posts are symmetrically provided at the surface of the motor, and two sets of correction boxes are symmetrically provided at a surface of a rotor assembly.

Abstract: A drive arrangement for a bicycle has a multi-sprocket arrangement for a rear wheel hub of the bicycle. The multi-sprocket arrangement comprises a plurality of sprockets with different diameters, wherein the sprockets each have a plurality of teeth which are separated by tooth spaces and which can be placed in engagement with a drive chain with wide and narrow chain links which follow one another alternatively in succession. On at least one sprocket, a corrective feature is provided which is designed such that the drive chain, as it revolves around a selected sprocket or during a sprocket changeover from a starting sprocket to a selected sprocket, is oriented, with regard to its wide and narrow chain links, in a predetermined chain link plate orientation relative to the teeth of the selected sprocket.

Abstract: A bicycle sprocket arrangement comprises a largest sprocket, a smallest sprocket, and a plurality of intermediate sprockets. A first quotient is obtained if a total tooth-space number of the large sprocket is divided by a half of the tooth-space number difference. The first quotient is an even number with respect to all sprockets of the plurality of intermediate sprockets. A second quotient is obtained if the total tooth-space number of the small sprocket is divided by a half of the tooth-space number difference. The second quotient is an even number with respect to all sprockets of the plurality of intermediate sprockets excluding a largest intermediate sprocket of the plurality of intermediate sprockets.

Abstract: A toothed wheel assembly that has at least two toothed wheels. Each toothed wheel has a plurality of teeth separated from one another by corresponding troughs and the second toothed wheel has a greater number of teeth than the number of teeth of the first toothed wheel. A plurality of connection bodies connect the first and second toothed wheels axially and space them. Each connection body has a first connection portion that is connected to the second toothed wheel and extends radially from the second toothed wheel towards the first toothed wheel and a second connection portion connected to the first toothed wheel that extends axially from the first toothed wheel. The second connection portion of each connection body has a circumferential bulk the radial projection of which is completely contained in a trough of the first toothed wheel.

Abstract: A bicycle sprocket has a rotational center axis. The bicycle sprocket comprises a sprocket body and a chain engagement structure. The chain engagement structure is arranged on a radially outer periphery of the sprocket body. The chain engagement structure includes a plurality of chain-driving teeth to engage with a bicycle chain to transmit a rotational driving force to the bicycle chain, at least one downshifting facilitation area to facilitate a downshifting operation from the bicycle sprocket to a smaller sprocket, and at least one downshifting facilitation projection disposed in the at least one downshifting facilitation area to engage with the bicycle chain when the bicycle chain shifts from the bicycle sprocket toward the smaller sprocket.

Abstract: In a hand-held power tool with a drive motor and a clutch connected to the drive motor and having an output part, the drive pinion is fixedly connected to the output part of the clutch so as to be driven by the drive motor for driving a tool. The drive pinion has a first individual part and a second individual part that are fixedly connected to each other. The first individual part has a toothing and the second individual part is connected to the output part of the clutch.

Abstract: A debris venting cog particularly useful for belt driven bicycle power train systems. The cog includes an outer circumferential surface that is shaped to drivingly interact with a flexible drive member such as a belt. The cog includes a number of cavities that are each shaped to interact with a tooth of the belt. A vent fluidly connects at least one cavity to atmosphere and is shaped to direct debris that can accumulate in the cavity or the belt in a radially inward and lateral direction so as to maintain a desired driving interaction between the belt and the cog.

Abstract: A first sprocket is capable of engaging with a chain. The first sprocket has a first sprocket main body, a plurality of teeth disposed along a circumferential direction on the radially outer side of the first sprocket main body, and at least one shifting area. The teeth include at least one first tooth having a first maximum axial width and at least one second tooth having a second maximum axial width. The first maximum axial width is greater than the second maximum axial width. The first tooth is formed to be capable of engaging with an outer link plate of the chain. The second tooth is formed to be capable of engaging with an inner link plate of the chain.

Abstract: A crank set for a bicycle includes a free-wheeling device having holes for attaching chain rings. The holes include two separate circular bolt hole patterns L1 and L2.

Abstract: A sprocket and hub assembly for use with a mechanical drive assembly of an agricultural implement includes a generally flat disc having an outer edge and a generally center mount portion. A series of teeth are radially defined around the outer edge of the disc. The assembly further includes a hub removably mounted to the generally center mount portion of the disc. The hub has a shaft engagement portion for removably coupling the hub to a driven shaft of the mechanical drive assembly. In one embodiment, the agricultural implement includes a retainer designed to hold a set of differently sized sprockets that can be interchangeably coupled to the driven shaft by the hub.

Abstract: A method and systems for disengagement of a chain and sprocket actuation system is provided. In one version, an actuation system mechanically couples a motor with a rotatable feature. The rotatable feature may be a threaded stem that alternately raises and lowers a gate as the feature is rotated in a respective direction. A removable key comprised within the actuation key. When the key is removed from engagement with the motor, that rotatable feature is decoupled from the motor. A manual fixture, such as a wheel, may be used to rotate the rotatable feature by hand. The rotatable feature may thus be driven by the motor, or alternately decoupled from the motor and driven by hand.

Abstract: A bicycle sprocket is provided with a sprocket body and a chain engagement structure. The chain engagement structure includes sprocket teeth defining chain rollers receiving troughs. At least two consecutive ones of the troughs include a driven-side surface and a non-driven-side surface. The driven-side surfaces each have a first chain roller contact points corresponding to a first radius of a first minimum contact circle when one of the chain rollers is positioned to fittingly contact the driven-side surface. The non-driven-side surfaces each have a second chain roller contact points disposed at a second position corresponding to a second radius of a second minimum contact circle when one of the chain rollers is positioned to fittingly contact the non-driven-side surface. The first radius is larger than the second radius. The driven-side surfaces have effective concavities that are equal to or less than the curvatures of the chain rollers.

Abstract: A bicycle multi-gear cassette mountable to a wheel hub that generally includes a truncated conical shell and a plurality of toothed sprockets having different numbers of teeth. The shell includes a plurality of coaxial annular cylinders of variable diameter extending along an axis of the shell and a plurality of coaxial annular discs of variable diameter extending radially of the axis. The cylinders and discs are alternatingly arranged in a stepped sequence. The toothed sprockets are disposed on the shell and extend radially of the shell axis. At least one of the toothed sprockets includes a recess on a side facing an adjacent toothed sprocket having a smaller number of teeth. The recess includes a first region having a first depth and a second region having a second depth. The first depth is greater than the second depth. The shell and the plurality of toothed sprockets embody a single piece.

Abstract: A power transmission mechanism 5000 for an electric bicycle has a driving motor 990 mounted on the bicycle, and an outer shaft 580 with a hollow interior through which a crankshaft 590 of the bicycle penetrates. The outer shaft 580 is coupled to a driving sprocket 50 of the bicycle via an outer shaft combiner 18. The driving transmission mechanism 5000 of the electric bicycle has a driving motor connection one-way clutch 300 and a pedal connection one-way clutch 200.

Abstract: A bicycle sprocket apparatus comprises a larger diameter sprocket and a smaller diameter sprocket, wherein the larger diameter sprocket has on its outer periphery a plurality of sprocket teeth, the smaller diameter sprocket has on its outer periphery a plurality of sprocket teeth, and a number of sprocket teeth on the smaller diameter sprocket is less than a number of sprocket teeth on the larger diameter sprocket. The larger diameter sprocket includes a tooth and a first chain receiving tooth disposed immediately behind the tooth in the driving rotation direction, wherein the tooth includes a control side surface and an inclined side surface.

Abstract: A bicycle sprocket apparatus comprises a sprocket mounting member, a first sprocket, and a second sprocket. The sprocket mounting member includes a hub mounting portion and a sprocket mounting portion, wherein the hub mounting portion is structured to be mounted to a rotating hub that rotates around a rotational axis. The sprocket mounting portion includes a first sprocket mounting surface that faces in a first direction and a second sprocket mounting surface that faces in an opposite second direction. The first sprocket is disposed at the first sprocket mounting surface, and the second sprocket is disposed at the second sprocket mounting surface. A fastener fastens the first sprocket to the first sprocket mounting surface, and a chain supporting structure extends from the fastener in the first direction and projects in the first direction away from a side surface of the first sprocket that faces in the first direction.

Abstract: A sprocket for transferring a force between a chain and a drive element that includes a plurality of teeth and a plurality of openings proximate the teeth. Each tooth has a load-bearing flank and a non-load-bearing flank. One of the plurality of openings are arranged relative to one of the plurality of teeth, in one-to-one correspondence therebetween, such that the opening is asymmetrically divided by a radial centerline of the tooth, a first load strip is formed between the opening and the load-bearing flank of the tooth, and a second load strip is formed between the opening and the non-load-bearing flank of the tooth.

Abstract: A sprocket and hub assembly for use with a mechanical drive assembly of an agricultural implement includes a generally flat disc having an outer edge and a generally center mount portion. A series of teeth are radially defined around the outer edge of the disc. The assembly further includes a hub removably mounted to the generally center mount portion of the disc. The hub has a shaft engagement portion for removably coupling the hub to a driven shaft of the mechanical drive assembly. In one embodiment, the agricultural implement includes a retainer designed to hold a set of differently sized sprockets that can be interchangeably coupled to the driven shaft by the hub.

Abstract: A multi-speed sprocket assembly is suggested, including at least a larger sprocket and at least a smaller sprocket. The smaller sprocket has a trailing tooth which is last to engage the chain before moving onto the larger sprocket. The larger sprocket has a leading tooth which either is the first to engage between a first outer link plate pair of the chain or is located adjacent to a first inner link plate pair of the chain. At least the larger sprocket has an upshift transitional region which has a double spacewidth created by omitting a tooth and is immediately followed by the leading tooth. In the region of the double spacewidth, the larger sprocket is embodied in such a way that a crossing chain link comes into contact with the larger sprocket only in the region of the leading tooth.

Abstract: The present invention discloses a coaxial transmission and turning structure, which uses dynamic force of a hand-held electric tool having an output head to drive a working platform. In the present invention, a fixed sleeve is joined to the working platform fixedly. A bearing sleeve is rotatably accommodated inside the fixed sleeve. A torsion rod is rotatably installed inside the bearing sleeve. A fixing brace is secured on the top of the bearing sleeve and used to hold the hand-held electric tool. Thereby, one end of the torsion rod is able to engage with the output head of the hand-held electric tool. The other end of the torsion rod uses a transmission mechanism installed in the other end of the bearing sleeve to drive a driving wheel installed in the bearing sleeve to rotate. Thereby, the present invention can drive the working platform to move.

Abstract: A sprocket of a chain transmission for a bicycle is described, intended to be coupled with a further sprocket with a smaller diameter in a group of sprockets integral in rotation. The sprocket comprises a plurality of teeth which follow each other on the sprocket separated by spaces according to a direction of rotation of the sprocket, in which each tooth has a thickness, a width and a height and has a lead side, a following side, a front side and a rear side. The sprocket has a front bevel on at least one tooth of first disengagement of the plurality of teeth and a rear bevel on at least one tooth of last engagement of said plurality of teeth.

Abstract: The present invention relates to a power transmission device of the clutchless compressor, which includes: a pulley; a hub disposed in one side face of the pulley and connected to a driving shaft of a compressor; a drive-side connection member including a connection portion detachably connected to one side face of the pulley and a breaking portion connected to the connection portion and broken when a torque above a preset value is generated in the compressor; and a driven-side connection member connected to one side face of the hub and is connected to the breaking portion and including a plastic deformation portion outside the driven-side connection member so that the driven-side connection member is plastic deformed or is broken due to plastic deformation if a rotational shock is applied from the connection portion to a remaining breaking member remaining even after the breaking portion is broken.

Abstract: A sprocket of a chain transmission for a bicycle is described, intended to be coupled with a further sprocket with a smaller diameter in a group of sprockets integral in rotation. The sprocket comprises a plurality of teeth which follow each other on the sprocket separated by spaces according to a direction of rotation of the sprocket, in which each tooth has a thickness, a width and a height and has a lead side, a following side, a front side and a rear side. The sprocket has a front bevel on at least one tooth of first disengagement of said plurality of teeth and a rear bevel (60) on at least one tooth of last engagement of said plurality of teeth.

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 sprocket has a mounting part for mounting on a wheel and a corrugated section provided with teeth for engagement with a chain such that the sprocket has a reduces volume and weight and allows for appropriate engagement with the chain by having the position of the sprocket agree with the position of the chain. The mounting part has a first raised section raised toward a one plate surface side and a second raised section raised toward another plate surface side with respect to a longitudinally central plane extending through a center of the sprocket so as to divide the total volume and weight of the sprocket into substantially equal sections. A flat top part of the first raised section having a mounting hole is on a level with a bottommost end surface of the sprocket.

Abstract: A rotating drive apparatus comprises a plurality of shafts rotatably mounted in the apparatus substantially parallel to each other. At least one shaft is adapted to be operatively connected to a power source for rotation thereof. An idler is rotatably mounted on one of the shafts. A first band connector engages at least two shafts such that turning of the first band connector in response to rotation of one shaft causes rotation of the other. A second band connector engages the idler and at least two shafts such that the two shafts engaged by the second band connector rotate when the first band connector turns.

Abstract: A sprocket combination includes two or more sprocket devices each having one or more sprockets extended from a hub. The side portions of the sprocket devices may be engaged or secured together with a peripheral bulge-and-peripheral recess engagement, and without additional calibrating process. One or more fasteners may further be engaged through the sprocket devices for further solidly securing the sprocket devices together. The smallest sprocket device may be made of stronger materials, and the other sprocket devices may be made of lighter and softer materials.

Abstract: A sprocket assembly for an automotive timing chain system includes a main sprocket, an auxiliary sprocket mounted onto one side of the main sprocket for assisting the main sprocket, and an elastic member elastically coupling the auxiliary sprocket to the main sprocket for generating an elastic force between the main and auxiliary sprockets.

Abstract: A unidirectional wheel driving device for a vehicle includes a rotary member engaged on the axle of a wheel, a unidirectional bearing device engaged between the rotary member and the wheel axle, and a motor coupled to the rotary member to drive the wheel with a coupling device. The unidirectional bearing device includes a barrel secured on the axle, a sleeve secured in the rotary member, and a bearing engaged between the sleeve and the barrel for preventing the motor from being actuated when the vehicle is pushed by the users.

Abstract: A multiple-speed chain driving device includes a shaft, a rotors'assembly, a chain driving sprocket, and a shifting assembly. The rotors'assembly is mounted on the shaft and includes three rotors which are vertically mounted on each other and enclosed within the sprocket. The shifting assembly is also mounted on the shaft and located parallel with respect to the rotors' assembly. The device can be made in either 3-speed or 2-speed design and enables a few slightly different configurations for both designs. The device enables a smooth shifting process and allows only one sprocket to produce the full range of speeds presently obtained by a front sprocket assembly in a bicycle.

Abstract: A freewheel is provided for mounting a plurality of sprockets on an axle of a bicycle. The freewheel basically includes an inner tubular body, an outer tubular body coaxially mounted on the inner tubular body with a bearing assembly rotatably coupling the inner tubular body to the outer tubular body. A one-way clutch is coupled between the inner tubular body and the outer tubular body to allow one-way rotation between the inner and outer tubular bodies. In the preferred embodiment, seven sprockets are mounted on the exterior of the outer tubular body. The bearing assembly has a pair of ball bearing races of the same diameter located at one end. An outer ball housing and a side plate are utilized in conjunction with the inner tubular body to fixedly secure the first and second ball bearings on the exterior surface of the inner tubular body. The inner tubular body with the bearings is then fixedly coupled to the outer tubular body so that the outer tubular body can rotate relative to the inner tubular body.

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: The invention relates to a multipart drive shaft of a chain drive for chain scraping conveyors for heavy-duty sprags in coal mining, consisting of a main shaft with unilateral or bilateral internal gearing for receiving externally geared stub shafts for the gear connection, and a chain sprocket fastened to the main shaft for interaction with the conveyor chain band. In this invention, the chain sprocket fastened to the main shaft is constructed in multiple parts by radially running segments, and is shrink-fitted in several or all individual parts to the main shaft. In accordance with the invention, a radial division into two shrink-fitted casings and a chain drum is especially appropriate and economical.

Abstract: A bicycle sprocket includes a number of annularly equidistant teeth formed on an outer periphery thereof, the teeth on the sprocket being diametrically symmetrically formed. The sprocket includes two diametrically disposed easy-to-engage teeth. The sprocket further includes two diametrically symmetrical guiding surfaces formed on an outer side thereof. Each guiding surface extends over at least two teeth and includes an end merges with an associated easy-to-engage tooth. Each easy-to-engage tooth includes a right side with a concave surface and a sloped left side when viewed from the outer side of the sprocket, thereby forming a sharp end between the right side and the left side. One of the teeth covered by each guiding surface and most adjacent to an associated easy-to-engage tooth has a height lower than that of the remaining teeth on the sprocket and has a second concave surface on a right side thereof for engaging with one of a number of roller pins of a chain to be engaged with the sprocket.

Abstract: A multistage sprocket assembly for a bicycle comprises at least one larger sprocket and at least one smaller sprocket, in which both side surfaces of the larger sprocket are trimmed off at the positions corresponding to two downshifting paths and two upshifting paths designed for a drive chain when being shifted from the smaller sprocket to the larger sprocket or vice versa. The trim portion is large and deep enough to avoid any interference between the link plates of the chain and the larger sprocket, and to receive therein the link plates of the chain so as to provide a positioning function thereat during the chain shifting process.

Abstract: A plurality of sprockets are coaxially mounted together, wherein a spacing between each pair of adjacent sprockets is less than a thickness of at least one of the plurality of sprockets. In another embodiment of the invention, a plurality of sprockets are coaxially mounted together, wherein a spacing between each pair of adjacent sprockets is less than or equal to approximately 2.0 millimeters. In yet a further embodiment of the present invention, at least ten sprockets are coaxially mounted together to form a first free side sprocket surface facing laterally outwardly and a second free side sprocket surface facing laterally inwardly. A spacing between the first free side sprocket surface and the second free side sprocket surface is less than or equal to approximately 50 millimeters.

Abstract: A toothed belt drive gear (1) for a motor vehicle wheel, especially a pulley wheel for a motorcycle, is connected rotation-fast with the hub of a drive gear and has an outer rotating toothed ring (5). In order to facilitate the maintenance and care of the vehicle wheel and to avoid endangering the toothed belt by braking heat, the invention proposes that the toothed belt drive gear (1) has axial surfaces constructed as braking surfaces (2') of a disk brake (2), wherein the connection between the braking surfaces (2') and the toothed ring (5) has a low heat conductivity.

Abstract: A process for manufacturing multi-tiered and/or phased sprocket assemblies using capacitor discharge welding is provided.

Abstract: A portable power tool includes a power module and a tool module, e.g., a chain saw module which is attached to the power module and which can be readily exchanged with another tool module, e.g., a cutter module. The power module includes a power source such as two-stroke gasoline engine with a drive shaft. To facilitate rapid exchange of tool modules, there are two or more torque transmission members such as a pulley and a sprocket wheel on the drive shaft, so that different tool modules can be attached to the power module without removal and replacement of the torque transmission member.

Abstract: A multistage sprocket assembly for a bicycle with at least one large sprocket and one small sprocket disposed adjacent to each other and assembled in a relationship such that the distance between the escape point between a pair of adjacent teeth at the large sprocket and the engagement point between a pair of adjacent teeth at the small sprocket is small than an integer multiple of the chain pitch. A recess portion is formed at the side surface of the large sprocket facing the small sprocket to prevent interference between the side link plate of the chain with the side surface of the large sprocket when the chain is being shifted from the large sprocket to the small sprocket. The chain between the aforesaid escape point and engagement point is also supported by the recess portion and forms a nonlinear upshifting path as seen from an axial direction from the small sprocket to the large sprocket.

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 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 saw chain of a chain saw is driven by a drive sprocket assembly including a drive sprocket and a pair of separate drive rings arranged coaxially and rotatably on the drive sprocket. Drive links of the saw chain extend through an annular space formed between the drive rings and enter recesses formed in the drive sprocket to be driven thereby.

Abstract: A drive sprocket arrangement includes a drive sprocket and a drive ring rolling loosely on the outer periphery of the sprocket. Drive links of the saw chain enter recesses in the sprocket via orifices in the drive ring. The drive ring has at an axial inner edge thereof a radially inwardly directed flange to retain the ring on the sprocket, and at an axial outer edge thereof a radially outwardly directed flange to retain the chain in place. The flanges are arranged such that the axial inner edge will be disposed above the axial outer edge when the drive shaft of the chain saw points downwardly.

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: Endless belt conveyor in which the belt is stretched between two pulleys or drums one of which is a drive pulley provided, at least at one of its ends, with belt guiding devices consisting of a circular row of studs fitting into holes punched on the belt edge. To make is possible to use holes-and-studs guiding devices on a thin belt without any risk of the belt tearing, the studs are fastened on a ring mounted on the drive pulley shaft, coaxially therewith, so as to rotate on the shaft.