Abstract: A free-wheel hub transmission mechanism includes an axle, and an aluminum hub barrel and a driving barrel which are rotatably mounted on the axle. The driving barrel which carries a sprocket wheel has a threaded body portion extending into the hub barrel to connect to a coupling socket which transmits the rotation of the driving barrel to a reinforcing hollow body. The reinforcing hollow body is provided in and fixedly coupled to the hub barrel. The coupling socket is movable toward and frictionally engageable with the reinforcing hollow body upon rotation of the driving barrel in one direction and is disengageable from the reinforcing hollow body upon rotation of the driving barrel in another direction.

Abstract: In order to provide a vehicle with a driven wheel (30), which possesses an external wheel hub (23) and is driven with the aid of a thrust crank drive which, while easily and safely operable, is at the same time able to achieve a high terminal velocity and which is simple in the construction of the drive arrangement, the thrust crank drive comprises a crankwheel (38) and a thrust rod (37) rotatably hinged with one end to the crankwheel (38) outside the wheel axis for the transmission of the force. The driven wheel (30) is driven by means of a drive wheel (7) which, via a free-wheel mechanism (11,12, 13,14,19), is in operative connection with the external wheel hub (23) of the driven wheel (30). A first mechanism (36) is provided which transmits the force between the crankwheel (38) and the drive wheel (7) and, for overcoming the dead center, a second mechanism is provided in the thrust crank drive which at least partially neutralizes the effect of the free-wheel mechanism (11,12,13,14,19).

Abstract: A wheel hub for a bicycle wheel has a hub shell for receiving spokes of the wheel and a sprocket body receives the sprockets. The wheel hub and the sprocket body are connected through a free-wheel clutch. The roller bearings of the sprocket body are freely axially displaceable on the axle. An end member of the hub is screwed onto the sprocket-side end of the axle and acts as a locking device for pressing the sprocket body against the hub shell. To access the clutch and for disassembling the hub, the end member can be screwed off and the sprocket body can be pulled off the axle by hand. This simplifies assembly, disassembly and maintenance of the hub.

Abstract: An improved rear hub structure for bicycles includes a rear hub housing and a driving device. The driving device has a securing seat, multiple spring elements, multiple stop elements and a gear seat. The securing seat has a stem projecting from one end thereof. An iron washer with an embossed surface is disposed between the stem of the securing seat and a threaded slot of a through hole defined in the rear hub housing. The embossed surface of the iron washer contacts the threaded slot to prevent relative rotation. The stem of the securing seat has inner threads for engaging outer threads of a threaded rod. The threaded rod and the securing seat are locked together to prevent the securing seat from moving further toward the threaded slot of the through hole when the rear hub housing rotates forwardly. The iron washer prevents the stem of the securing seat from directly pressing against the rear hub housing and thus prevents it from deforming.

Abstract: A free-wheel hub transmission mechanism which includes a threaded axle coupled to the seat stays of a bicycle, a hub barrel fastened to the free-wheel spokes of the bicycle and disposed around the threaded axle, a driving barrel sleeved onto the threaded axle and having one end inserted into the hub barrel and an opposite end fastened to the free-sprocket of the bicycle, a coupling socket mounted within the hub barrel around the threaded axle, a conical spring mounted within the hub barrel around the coupling socket, a conical bushing and a cup mounted within the hub barrel to stop the conical spring inside the hub barrel, a plurality of ball bearings mounted around the threaded axle, and two lock nuts respectively threaded onto two opposite ends of the threaded axle, wherein the coupling socket is forced forwards into engagement with an inside annular flange of the hub barrel, causing the threaded axle and the hub barrel to be turned with the driving barrel when the driving barrel is rotated clockwise by the

Abstract: A one-way clutch includes an internal rotary member and an external rotary member, wherein a surface of the internal rotary member and a surface of the external rotary member define a clutch member space so that a width of the clutch member space varies from a wider portion to a narrower portion. A clutch member is disposed in the clutch member space so that (i) relative rotation between the internal rotary member and the external rotary member is inhibited when the clutch member is disposed in the narrower portion of the clutch member space; and (ii) relative rotation between the internal rotary member and the external rotary member is allowed when the clutch member is disposed in the wider portion of the clutch member space.

Abstract: A bicycle hub includes a hub body, an inner member coupled to the hub body for rotation therewith, and an outer member disposed about the inner member for rotation relative to the inner member. The outer member is adapted to be coupled to a chain gear for rotation therewith. A plurality of clutch rollers are disposed between an outer circumferential surface of the inner member and an inner circumferential surface of the outer member. The outer circumferential surface of the inner member and the inner circumferential surface of the outer member are shaped so that (i) when the plurality of clutch rollers are disposed in a first position the inner member and the outer member rotate together; and (ii) when the plurality of clutch rollers are disposed in a second position the inner member and the outer member can rotate relative to each other.

Abstract: Free wheel hub for cycles, in which the wheel hub is driven by the free wheel, by means of a unidirectional connection constituted by the cooperation of at least one movable ratchet acted upon by a spring so as to move toward an operative projecting position, in which it cooperates with teeth, this ratchet being free to pivot on a support piece fastened to the hub body, while the teeth are produced on a free wheel body. The ratchet-support piece is made of a material whose mechanical properties and/or density are similar to those of the material used to make the hub body, this ratchet being mounted so as to pivot on a gauge rod attached to the support piece, this gauge rod being made of a material whose mechanical properties and/or density are similar to those of the material used to manufacture the free wheel body.

Abstract: A multi-speed transmission for transmitting power between a first shaft and a second shaft includes a plurality of gear sets, a plurality of connector gears corresponding to the plurality of gear sets and a shifting mechanism. Each gear set includes a first gear rotatably disposed about the first shaft, a uni-directional free wheeling mechanism between the first gear and the first shaft, and a second gear coupled to the second shaft. The uni-directional free wheeling mechanism permits the first gear to freely rotate about the shaft when the first gear rotates in a preselected direction relative to the rotation of the first shaft and locks the first gear to the first shaft at all other times. The first and second gears are spaced apart from one another but may be interconnected by one of the plurality of connector gears. Each connector gear is movable between an engaged position and a disengaged position.

Abstract: A roller bearing consists of a hollow cylindrical main body, two annular locating plates, a plurality of rolling bodies and elastic elements. The cylindrical main body is provided with at least three roller grooves equidistantly and equiangularly spaced and disposed around its interior hollow. Each roller groove is configured to have an elastic element seat arranged at its deeper end. The groove wall around the groove opening connected to the interior hollow of the main body extends and forms a reduced neck portion, which makes the groove opening have a width smaller than the diameter of rolling bodies to keep rolling bodies from dropping out of the groove. On the central area of each end surface of the cylindrical main body is an inner annular portion and between end surfaces of the main body and of the inner annular portions are provided with locating grooves.

Abstract: A hub for a bicycle can typically have an axle for being non-rotationally connected to a frame of the bicycle, a hub body rotatably mounted about the axle, and a drive element rotatably mounted on the axle. A plurality of transmission elements can preferably be disposed between the axle and the hub body for transmitting a drive force from the drive element to the hub body, and a selection between various gearing ratios provided by the transmission elements can preferably be provided by a selectively engageable ratchet mechanism and a control device for selectively engaging and disengaging the ratchet mechanisms. The ratchet mechanism can be provided by at least one pawl, biased radially inward by at least one spring, to non-rotationally couple a ring body in one direction of rotation with the axle.

Abstract: A multiple sprocket chainwheel for bicycle derailleurs to drive a hub bushing on the rear wheel by means of at least two sprockets which have different numbers of teeth, and which are located non-rotationally on a chainwheel bushing, whereby spacing connecting rings with bearings and a drive bushing are located between the sprockets, which drive bushing is driven in the driving direction by the chainwheel bushing by means of a freewheel mechanism, whereby the connecting rings have clamping projections which can be inserted into clamping points on the sprockets, which makes possible it possible to have an alternating arrangement in series of a sprocket, a connecting ring, a sprocket, a connecting ring etc. The desired position of one sprocket in relation to another is achieved when a guide tooth on the inside diameter of the one sprocket coincides with the guide tooth on another sprocket.

Abstract: An improved rear hub transmission mechanism for use in bicycles including a hub body, an axle, a sleeve, and a driving assembly. The hub body has a through hole and an axle assembly. The through hole is circumferentially provided with a plurality of grooves and has a polygonal hole and a round hole at either ends thereof. The sleeve has a lower section having external threads and a bracing section, and an upper section having a plurality of grooves and a flange. The grooves in the sleeve lock with the grooves in the through hole while the flange fits in with the polygonal hole of the through hole when the sleeve is inserted into the through hole. The driving assembly consists of a mounting, a plurality of resilient members and retaining elements, and a gear seat. One end of the mounting is provided with a tube for insertion into the round hole of the through hole for positioning the sleeve.

Abstract: Disclosed herein is a uni-directional transmission with positive engagement and automatic disengagement features. The transmission includes a rotatable drive shaft coaxially aligned and housed inside a rotatable hub. Attached to the drive shaft is a uni-directional friction clutch which automatically engages when the drive shaft is rotated in a forward direction. When the friction clutch is engaged, a spline disc located on the drive shaft is forced axially on the drive shaft causing the axially aligned teeth formed on one surface of the spline disc to positively engage the complimentary-shaped, axially aligned teeth formed on the ratchet surface on the hub. When the teeth on the ratchet surfaces are engaged, torque from the drive shaft will be transferred to the hub. A coil spring is disposed on the drive shaft between the spline disc and the hub which acts to automatically disengage the ratchet teeth on the spline disc and the hub when rotation of the drive shaft is stopped or reversed.

Abstract: A bicycle hub shell has an axial bore with a first end portion, a second end portion and an internal wall which confines the axial bore into a first section adjacent to the first end portion and a second section adjacent to the second end portion and narrower than the first section. A first bearing-receiver is disposed in the first end portion of the hub shell and has an enlarged head to receive a bearing therein and an internally threaded connecting tube which extends into the first section. A cylinder drive has a head portion disposed partially in the second end portion of the axial bore, an externally threaded end portion which is spaced axially from the head portion, and a plurality of ratchet pawls exposed exteriorly from the second end portion of the axial bore. The head portion of the cylinder drive further has an externally threaded and axially extending tube extension projecting into the first section of the axial bore and engaging the connecting tube of the first bearing-receiver.

Abstract: A bicycle freewheel gear cluster mounting structure including a wheel hub having a toothed hole and a circular recess around two opposite ends of a longitudinal center through hole thereof; a lock nut mounted within the circular recess to hold a bearing assembly and a freewheel gear cluster around the bearing assembly; and a hollow T-rod having a toothed head at one end meshed with the toothed hole on the wheel hub and a screw rod section at an opposite end inserted through the longitudinal center through hole of the wheel hub and threaded into the lock nut.

Abstract: An overrunning clutch assembly comprises a housing and a tubular shaft rotatably coupled together with a roller or sprag clutch positioned therebetween to permit the housing to freely rotate about the shaft in one direction, or to establish torque communication between the shaft and the housing when rotated in the opposite direction. To minimize the weight of the assembly while also containing the radial forces and stresses generated by the roller clutch when transmitting torque, the housing and the shaft are reinforced with high-strength, high-modulus materials having high strength-to-weight ratios.

Abstract: The present invention relates to a bicycle freehub having a hub body, an axle and a sprocket coupling. The axle is coaxially disposed in the hub body which has a spindle, two flanges and two ring ends. One of the ring ends has a receiving cavity and the other ring end has a bearing receiving recess. The receiving cavity provides a ratchet ring which has an outer rim and a plurality of ratchets provided along its inner circumference. The sprocket coupling has a cylindrical pawl driver at one end. The pawl driver further provides at least two recesses on its circumference for retaining two pawls thereon respectively and an annular groove along its outer periphery fpr receiving a coil spring to hold the two pawls in position. The sprocket coupling is connected with the hub body by inserting the pawl driver into the receiving cavity coaxially, thus the pawls are engaged with the ratchets for enabling said sprocket coupling to drive the hub body in a direction but is free to rotate in the other direction.

Abstract: A bicycle hub unit includes a hub shell with an axial bore which has a first axial end portion and a second axial end portion opposite to the first axial end portion, A cone has an externally threaded tip portion and a head portion secured to the second axial end portion of the axial bore. A sprocket carrier is supported around the cone for rotation relative thereto in only one direction. The hub shell has an annular series of internal splines formed in the second axial end portion of the axial bore, and a radial inward flange projecting from an inner peripheral surface of the hub shell. A lock nut is disposed entirely within the axial bore and has an internally threaded portion, and an end surface bearing against the flange. The nut has a length shorter than that of the axial bore.

Abstract: For free shifting in a multi-speed gear hub comprising a claw clutch, first and second springs are included for preloading a projecting claw part in mutually opposite directions. Preloading in the second direction is with less force than in the first direction, for abutment of the claw part on a driving member. Against the force of the first spring, the driving member is displaceable from abutment, into all gearshift positions following in the second direction. Gears preselected with stationary hub are engaged upon resumption of gear action.

Abstract: A hub includes a hub shell having two flanges, a number of ratchet teeth formed in one of the flanges, a spindle rotatably engaged in the hub shell, a sleeve disposed on the spindle and having one or more pawls disposed on the outer peripheral portion for engagement with the ratchet teeth in order to drive the hub shell. The hub can be used in the front portion of the bicycle. The sleeve may include an extension for supporting the sprockets such that the hub can also be used in the rear portion of the bicycle.

Abstract: A drive assembly is provided for a multi-speed pedal drive bicycle that allows the bicycle's gears to be shifted even when the pedals are not being trod upon. This advance in multi-speed bicycles is accomplished through a new front chain ring that is capable of freewheeling with respect to a crank axle in combination with the employment of a friction plate between the rear wheel hub and the rear freewheel cassette allowing 1:1 transmission of the rotation of the rear wheel to the rear freewheel cassette which continuously moves the chain of the bicycle provided the bicycle is moving.

Abstract: A clutch mechanism for use on a conventional bicycle which permits independent actuation of both pedals and provides a driving force through 100% of a pedal stroke. The clutch is generally comprised of a single, outer, cylindrical rotor which extends between the two pedals, and two internal rotors, respective to each pedal, positioned within the outer rotor. The internal rotors each include respective longitudinally extending, annularly spaced webs and longitudinally extending V-shaped portions integrally positioned between successive webs. In addition, magnets are attached to each rotor and positioned at the vortices of the V-shaped portions. The clutch further includes a set of cylindrical rods positioned between the two rotors which become wedgingly engaged between the magnets and the outer rotor when the pedal is actuated by a user of the bike. In addition, each pedal is attached to the frame of the bike via a spring which prohibits the pedal from being rotated a full 360.degree..

Abstract: A freewheel assembly has a specialized mounting sidewall which keys to a mating endwall of a bicycle hub so that the freewheel drives the hub directly through positive interengaging keying structure rather than the threaded shaft connection by which conventional, current freewheels are mounted. The keying structure comprises bosses in the hub endwall and corresponding recesses in the sidewall of the freewheel in the preferred embodiment, with screws through the spindle endwall recesses into the bosses. The freewheel gear sprocket spindle also accommodates a smaller sprocket than is commonly usable, and will accommodate multiple sprockets in parallel on a BMX bicycle, with the sprockets being removable and thus separate pieces from the freewheel spindle.

Abstract: A hub assembly for a bicycle wheel comprises a tubular body part having two spaced flanges for connection to the spokes of the wheel. A tubular sprocket carrier support extends from one end of the body part, and surrounding the sprocket carrier support is a carrier on which axially spaced toothed sprockets are mounted. The carrier is rotatable in one direction relatively to the hub to provide a free-wheel. The bearing between the carrier and the support is a plain bearing to minimise the diameter of the carrier and support, and thus permit smaller sprocket wheels to be employed. The hub bearing sets are so dimensioned that they may both be inserted from the same end of the body part.

Abstract: A self-contained change speed apparatus for use on a bicycle having a fixed shaft, a drive member and a hub body rotatably supported on the fixed shaft, and a change speed device disposed between the drive member and hub body. The change speed device includes a plurality of clutches and a clutch controller. The clutches are subjected to a resistance to disengagement corresponding to a drive torque. The clutch controller includes a shiftable first control member, a spring for storing a shift of the first control member as energy, and a shiftable second control member operable by the spring for operating the clutches. The second control member shifts to disengage the clutches when the first control member shifts and the spring imparts a force greater than the resistance to disengagement for shifting the second control member.

Abstract: A bicycle wheel hub has identical endwalls which mount outwardly directed bosses for engaging in mating recesses of a self-contained freewheel mechanism to enable the freewheel mechanism to be mounted to the hub with a positive engagement to the hub rather than being threaded onto a hub extension. The assembly also incorporates sealed bearings which insert into seats recessed into the opposite ends of the axle bore, with the radially inner races of the bearings being captured axially on both sides, on the inside by an enlarged central axle length, and on the outside by sleeves which are slipped over the reduced axle end extensions and bear against the bicycle mounting forks to define a straight compressive chain through the sleeves, inner bearing races and central axle portion so that compressive stresses are not exerted on the bearings by the mounting of the hub to the fork.

Abstract: A one way clutch comprises an inner clutch member (12) and an outer clutch member (10). The outer clutch member carries a set of ratchet teeth (18) and the inner clutch member carries two sets of sloping faced projections (20, 22) around its periphery. An arcuate resiliently flexible member (14) is arranged between the inner and outer clutch members and has a set of ratchet teeth (26) engageable with the outer member ratchet teeth and a set of sloping faced projections (37) at intervals along its length. A tail end of the member carries a pawl (32). On relative rotation of the inner and outer members in a non-driving direction, the pawl ratchets over the outer clutch member ratchet teeth.

Abstract: According to an illustratie example of the invention, a pawl-ratchet free-wheel mechanism has an inner rotor and an outer rotor. The outer rotor is provided with a pocket located in an inner circumferential face of the outer rotor. A pawl is pivotally mounted in the pocket. The pocket is formed by dislocation of material of the outer rotor member by a cold shaping method.

Abstract: A variable speed shaft drive system for bicycles employs a drive shaft that is generally horizontally coupled between the pedals and the rear wheel of the bicycle. A pinion gear at the forward end of the drive shaft is engaged by a ring gear driven by the pedals to transmit drive power from the pedals to the drive shaft. A drive head at the rear end of the drive shaft frictionally engages a drive pick-up plate mounted to the rear wheel of the bicycle to transmit drive power from the rotating drive shaft to the rear wheel. Infinitely variable speed control is achieved by means of a shifting fork actuated by the user to position the drive head at selected distances from the center of the drive pick-up plate. Alternatively, a second drive head/pick-up ring combination may be substituted for the ring gear/pinion gear combination driven by the pedals to provide even smoother operation.

Abstract: A cylindrical cassette body contains the movable balls and ball-biasing springs of a ball-type clutch. The balls ride in grooves in an element disposed within the body. Exteriorly, the cog body has longitudinal keyways to receive internal teeth of a set of cogs all of which have the same internal diameter. The exterior of the body is also threaded and is selectively employed in combination with a free-wheeling cog adapter having two different outer diameters, such adapter receiving a set of cogs having two different inner diameters.

Abstract: A device for a bicycle comprising a drive transmission which is coupled to the drive wheel of the bicycle and includes a gear change mechanism with a number of different size chain sprockets, a shifting device coupled to the gear change mechanism and a freewheel coupling arranged between the drive wheel and the chain sprockets. Moreover, the device comprises a disengage mechanism (34-37) which is coupled to the shifting device (20) of the gear change device by means of a friction element (19) and a drive member (23) for enabling simultaneous disengagement of the freewheel coupling and change of gear.

Abstract: A light-weight, corrosion-resistant, multiple engaging ratchet assembly comprising few, easily manufactured parts for simplified operation of pawls and ratchet teeth in a free-wheel drive gear ratchet assembly. An outer wheel includes a cavity to receive an inner wheel with a pawl ring or integral pawls. The pawls ride over ratchet teeth protruding from a circumferential surface on the outer wheel when the inner wheel and the outer wheel rotate in opposite directions. Turning the inner wheel in a second direction the same as the outer wheel direction of rotation brings the pawls into engagement with the ratchet teeth causing the inner wheel to drive the outer wheel.

Abstract: Drive mechanism, particularly for use with a bicycle, of the type having variable diameter drive and driven members connected by an endless belt which engages adjustable segments on the members. Through a control means the drive ratio can be adjusted to multiple, discrete settings. Belt wrap is maintained between the belt and the drive and driven members at all settings by two idlers which are independently supported for movement. A locking rail is used to release and secure the segments on the members and a split clutch is used with the driven member for easy rear wheel removal. The mechanism has a lost motion device to accommodate forward and rearward pedaling without harming the drive mechanism. The drive mechanism is modular in construction so it can be used with frames of varying sizes and the drive mechanism can be quickly removed from or assembled to the bicycle frame when replacement is desired.

Abstract: A stepless speed change device including an eccentric cam assembly whose eccentricity is adjustable relative to a center shaft, a carrier rotatably arranged about the eccentric cam assembly, rotary members on input and output sides, respectively, and a plurality of friction pieces arranged in two rows each including a plurality of the friction pieces. The friction pieces in one row are rockably connected to the rotary member on the input side and free ends of the friction pieces are engaged with an inside of the carrier. The friction pieces in the other row are rockably connected to the carrier and free ends of the friction pieces are engaged with an inside of the rotary member on the output side. As an alternative, all the friction pieces are rockably connected to the carrier and free ends of the friction pieces in one row and the other row are engaged with insides of the rotary members on the input and output sides, respectively.

Abstract: A bicycle hub comprises a hollow hub body rotatably supported on a hub shaft, a drive member rotatably supported on the hub shaft at one end of the hub body to receive a driving force, a slider disposed within the hub body for co-rotation with the drive member on the hub shaft but slidable axially of the hub shaft. The hub body are brought into driving engagement with the slider by a first ratchet mechanism in one rotational direction as well as by a second ratchet mechanism in the opposite rotational direction. The slider is axially moved by a change-over mechanism to bring selected one of the first and second ratchet mechanisms out of ratcheting operation.

Abstract: A torque responsive five-stage automatic shifting hub utilizes inner wrapped spring clutches to rotate a plurality of co-axial cylinders except for the cylinder at one end of the axis rotated by a sprocket. Gearing is interposed between the cylinders to rotate them at progressively different rpm. The wheel hub is rotated by outer wrapped springs, one over each cylinder, having one end secured to the hub and the other end floating. The outer wrapped springs automatically wrap on a cylinder rotating faster than the hub and automatically release a cylinder rotating slower than the hub. The inner wrapped spring clutches are actuated by compression springs between the cylinders which expand to actuate the associated clutch and compress to deactivate the clutch. The compression springs are of progressively different strengths along the axis of the cylinders.

Abstract: A bicycle free-wheel starwheel has receptacles 3, 4 for spring pawls 5 which interlock the starwheel 1, in one direction of rotation, with an outer ring 21 of a sprocket wheel within which the starwheel is rotatably mounted. The starwheel consists of at least one stamped piece, and the receptacles for the spring pawls are mounted on or stamped integrally with the starwheel.

Abstract: A speed change device for a bicycle comprises a carrier jointed to a crank arm and a plurality of planet gears rotatably supported on a plurality of shafts arranged in a circle on said carrier. Each of the planet gears includes a plurality of planet gear elements different in number of teeth. The device further comprises an internal gear in mesh with ones of the planet gear elements of the planet gears and formed in an outer circumference with a sprocket to form a driven rotary body, one-way clutches for connecting the driven rotary body to the carrier, a plurality of sun gears provided on a crankshaft and in mesh with the planet gear elements of the planet gears, respectively, and one-way clutches provided between inner circumferences of the sun gears and a fixed bearing enclosing the crankshaft. One of the one-way clutches last mentioned is able to connect selectively.

Abstract: A transmission mechanism which includes a rotatable driving member and a driven member. One of the driving member and the driven member includes ratchet teeth and the other supports a first transmission pawl and a second transmission pawl each having engaging portions engageable with the ratchet teeth and substantially semicircular-shaped base portions. A substantially C-shaped pawl spring is wrapped around the one of the driving member and the driven member which supports the pawls. The pawl spring biases the first transmission pawl and the second transmission pawl in a direction such that the engaging portions thereof engage with the ratchet teeth. A locking member is provided to prevent rotation of the pawl spring. The first transmission pawl is positioned such that its engaging portion is oriented toward the first free end of the pawl spring and the second transmission pawl is positioned such that its engaging portion is oriented away from the second free end of the pawl spring.

Abstract: A wheelchair having a propulsion and speed change mechanism, the mechanism has a clutch with a cam clutch (21) and a cylindrical fly wheel (23) installed on a hub (24) of the shaft (25) of the main wheel of the chair. The clutch includes roller bearings (14), plate springs (22) and forward and backward regulating device (15). A matched union gear (20) is formed at the center of the cam clutch (21) and matched with a union gear (19) formed on a propulsion and speed change bar (12) so that the cam clutch (21) and the propulsion and speed change bar move as one body. The cam clutch (21) and the bar (12) are installed with a bearing (17) on the axle of the frame (13) of the wheelchair. A connecting rod (2) has one end connected to one of a plurality of holes (10) on the propulsion and speed change bar (12) with a fixing pin. The other end of the rod is connected to the hole (7) of the propulsion and speed change bar with a moveable pin (6).

Abstract: A freewheeling overrunning clutch for a bicycle, moped, and the like vehicle comprises a plurality of clutch pawls present between an outer wheel and an inner wheel which are supportable elastically on one side on the inner wheel circumference and on the other side on a plurality of inner teeth of the outer wheel. In order to provide a simple, almost noise free structure which is easy to mount, the clutch pawls pivotally supported in a flexible supporting ring positioned between the inner and outer wheels. Ends of the clutch pawls which face the inner wheel are brought into engagement with the plurality of teeth protruding outward from the inner wheel. The flexible supporting ring advantageously may simultaneously be a spacing ring for a plurality of balls of a ball bearing or bearings positioned adjacent the clutch pawls between the outer and inner wheels.

Abstract: A driving device for bicycle comprising a pedal system having a left and a right pedal which repeat reciprocating motion and a hub section provided with a left and a right driving force transmission mechanism for transmitting the treading force applied to each pedal to the driving wheel independently, the aforesaid driving force transmission mechanism transmits the forward torque imparted through the pedal to the driving wheel but does not transmit the rearward torque and is provided with a clutch mechanism for disconnecting the connection between the driving wheel and the pedal when the driving wheel reverses as the bicycle is moved back. When the pedals are treaded for reciprocating motion, the driving wheel is rotated in the forward sense to move the bicycle forward and even when the left and right pedals are interlocked so that they can be treaded alternately, reversing the driving wheel is feasible so that the bicycle can be also moved back.

Abstract: A freewheel for a bicycle having an annular space formed between a cylindrical driving member carrying sprockets and a cylindrical driven member and between a pair of bearings supporting the driving member rotatably with respect to the driven member. The annular space is closed by sealing rings, and the driving member is provided with an oil feeding conduit which is open at one end into the annular space and at the other end outwardly from the driving member.

Abstract: The invention relates to a one-way clutch structure for a stationary exercise cycle, which structure comprises a flywheel journalled on an axle and a cog wheel for the transmission of the force created by treadling to said flywheel. Said one-way clutch structure allows, depending on the treadling velocity, the free rotation of the flywheel with respect to the cog wheel. In order to provide a one-way clutch structure of low manufacturing costs, the cog wheel is journaled on a first cylindrical surface formed in the center of the flywheel by means of a bushing member of plastic material. The coupling element is formed by a spring acting as a spring clutch known per se, which spring is fitted around the bushing member and a second cylindrical surface formed in the center, whereby the end of said spring which is on the side of the cog wheel is bent and locked in an opening provided on the cog wheel.

Abstract: A cycle hub is shown which can be converted between coaster brake and freewheeling operation without removal from the cycle. A unidirectional clutch is interposed between a hub sprocket and a coaster brake drive, coupling them for forward driving. It can selectively be disabled to prevent freewheeling or be enabled to permit it. When the clutch is disabled, the coaster brake hub operates conventionally.

Abstract: A hub is proposed for a two-wheeled vehicle comprising a hub spindle (1) and a hub sleeve (3) mounted rotatably on the hub spindle (1). The hub sleeve (3) is formed as a light metal die-casting, one (39) of the two spoke flanges (39, 41) being integrally cast to the hub sleeve, while the other, separately produced spoke flange (41) is rigidly secured to a seating surface (43, 45) cast to the die-casting. In the entire external circumferential surface of the die-casting the radial distance of the outer circumferential surface from the rotation axis, starting from an external circumference with maximum diameter, exclusively decreases or at least remains constant with increasing axial distance from the maximum external circumference.

Abstract: One way clutch mechanism for a bicycle freewheel hub, which comprises a driver having one or more sprockets thereon and co-axial and relatively rotatable with respect to a stationary axle, a hub shell co-axial and relatively rotatable with respect to the axle, an inward conical clutch face formed on or with the hub shell, an internally threaded clutch member co-axially and relatively rotatably mounted on a threaded section of the driver so as to axially move back and forth; an outward conical clutch face formed on or with the clutch member, and a coil spring so arranged as to urge the clutch member axially inwardly thereby to force the outward clutch face away from the inward clutch face.

Abstract: A hub for a bicycle wherein a tubular support, having at its outer peripheral surface a non-circular cross-section, is provided at a hub shell which is supported rotatably to a hub shaft, a driven cylinder of a freewheel is fitted and fixed to the tubular support. The hub shell is provided with an elongate inner screw-threaded portion. A screw-threaded cylinder is provided which is adapted to have at one end an outer screw-threaded portion screwable with the inner screw-threaded portion and to have at its other end a projection which is engageable with one end of the driven cylinder, so that the screw-threaded cylinder is screwed with the hub shell to fix the driven cylinder to the hub shell.

Abstract: Propulsion and speed change mechanism for lever propelled bicycles having a pair of propulsion levers 4, each of which is built in one piece with a speed change arm 3 and mounted in each side of the main shaft portion 2 at the bottom of the bicycle frame 1. A rear axle 5 and a hub 6 is mounted on the rear shaft portion 2'. A one-way clutch mechanism has roller-type free wheels 11a installed at both ends of the rear axle. Chains 7", the ends of which may be connected together with a see-saw cable 7', are entrained around gears 7 and guide rollers 13. The free ends of the chains are connected by connecting bars 14 having pins to the speed change arm 3. Pivotally mounted members 15 of triangular shape and a cam bar 17 operated by a speed control knob 18 are used to change the effective length of the arm for speed control.