Abstract: A bicycle gear crank assembly includes a crank having a boss portion fittable to a crank shaft, and a chainwheel mounted on the crank boss portion. The chainwheel includes a largest sprocket and at least one smaller sprocket coaxial with the largest sprocket. The crank boss portion is provided with backup arms located on the side of the largest sprocket laterally away from the smaller sprocket. The backup arms extend radially outward from the crank boss portion to contact the largest sprocket radially outwardly of the crank boss portion, so that the backup arms prevent the largest sprocket from laterally bending in a direction away from the smaller sprocket.

Abstract: A bicycle brake lever assembly comprises a mount bracket having a front end and a base end fixable to a bicycle handlebar, and a brake lever extending downward from the mount bracket and having a connecting end pivotally connected to the front end of the mount bracket. The mount bracket further has an upper surface elongated enough to work as a palm rest for a rider. The brake lever has a first finger engaging portion which is substantially straight and extends rearward from the connecting end to approach the base end of the mount bracket. The brake lever further has a second finger engaging portion which is substantially straight and bent relative to the first finger engaging portion to extend downward away from the mount bracket.

Abstract: The present invention provides a bicycle front derailleur mounted close above a multiple chainwheel for shifting the chain from one sprocket to another of the chainwheel. The derailleur comprises a parallelogrammic linkage mechanism deformably mounted to a seat tube of the bicycle frame, and a chain guide carried by the linkage mechanism. The linkage mechanism is always biased by a return spring in a direction to move the chain guide laterally away from the seat tube. The linkage mechanism includes an inner link and an outer link. The outer link has an upper end formed with an actuating arm extending laterally toward the seat tube for connection to a control cable which is used to pull up the actuating arm for deforming the linkage mechanism against the return spring.

Abstract: A shift lever assembly for use in a bicycle wherein a wire connected at its one end to a derailleur is wound up or paid out to operate the derailleur. The assembly comprises a lever pivot fixed to the handlebar of the bicycle; a shift lever having a base-end boss portion rotatably supported by one end of the pivot and an arm portion extending from the boss portion; wire winder separate from the lever and rotatably supported by the pivot; a lever-coupled member provided between the boss portion and the winder and supported by the pivot so as to be rotatable with the winder; and a clutch for transmitting the rotation of the shift lever to the lever-coupled member. The shift lever is so biased by a spring as to return to a neutral position for starting rotation toward the wire winding direction and the wire paying-out direction.

Abstract: A bicycle speed change lever assembly according to the present invention comprises a first lever, a second lever and a reversal connecting mechanism. The first lever is pivotally supported by a first pivot shaft and connected to one end of a control cable. The second lever is pivotally supported by a second pivot shaft which is displaced from the first pivot shaft but extends in parallel thereto. The reversal connecting mechanism connects the first lever to the second lever in such a way that when one of the levers is progressively pivoted in one direction, the other lever is progressivley pivoted in the opposite direction.

Abstract: The present invention provides a bicycle multiple chainwheel to be mounted on a pedalling crank assembly. The chainwheel, which is held in driving engagement with a chain, comprises a larger sprocket and at least one smaller sprocket coaxial with the larger sprocket. When shifting the chain from the larger sprocket to the smaller sprocket, the chain normally starts disengaging from the larger sprocket at one of specific circumferential positions thereof. In view of this, the larger sprocket is made to have local chain guide portions only at those positions necessary for preventing the thus disengaged chain from being trapped in an axial gap between the larger and smaller sprockets.

Abstract: A bicycle speed change lever assembly comprises a fixed support shaft, and a control lever pivotally supported on the support shaft and always subjected to a tension tending to pivot the lever in one direction. The lever has a boss portion housing a click ring formed with an arcuate series of clicking recesses. The click ring is co-rotatable with the lever boss portion. A ball is retained by a non-rotatable retainer disc in facing relation to the recess series. In one operational mode, the lever is given a rotational friction overcoming the tension, while the ball is backed up by a mode selector in a manner such that the ball comes into clicking engagement with the recess series with the capability of slight retreating movement.

Abstract: The present invention provides an adjustable shoe mounting structure for a bicycle brake assembly. The mounting structure includes a support bolt inserted into a reception bore of each brake arm and having one projecting end screwed to a nut. The support bolt further has a head formed with a cross bore extending transversely of the bolt. Each brake shoe has a mounting pin inserted into the cross bore of the bolt. A pin retainer is fitted on the bolt head, and has a pair of pin retaining holes for press-fitting engagement with the mounting pin to restrain the movement thereof relative to the cross bore upon loosening of the nut.

Abstract: A bicycle handle assembly comprises a pair of side clamps provided on a handle post, and a pair of half handle bars respectively supported by the side clamps. Each half handle bar includes a straight mounting portion extending longitudinally of the bicycle, a rest portion extending laterally outward from the mounting portion, a main grip portion provided on the rest portion at a position spaced laterally from the mounting portion, and an auxiliary grip portion disposed ahead of the rest portion and the main grip portion. The mounting portion is held by a corresponding side clamp but adjustable in position relative thereto longitudinally of the bicycle.

Abstract: A support structure for a bicycle saddle comprising a first seat post mountable to a seat pipe of a bicycle frame, and a second seat post for supporting the saddle. The first seat post is provided at the upper end thereof with a post support portion having a mounting bore which extends obliquely upwardly and forwardly of the bicycle. The second seat post is slidably fitted in the mounting bore and held at an adjusted position relative thereto by a lock mechanism which is operable by the cyclist during riding.

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 bicycle auxiliary brake control assembly which is provided on a bicycle body in a path of a double type control cable extending from a brake lever assembly to a brake assembly and including an outer cable and an inner cable, the outer cable being divided into two separate sections each having a divided end, wherein the auxiliary brake control assembly comprises a fixed member engaging with the divided end of one section of the outer cable at a fixed position, and an operating member engaging with the divided end of the other section of the outer cable and movable to enlarge and reduce the distance between the divided ends of the respective sections of the outer cable.

Abstract: A multiple freewheel for a bicycle comprises a set of diametrically different sprockets axially fitted onto a sprocket ring or carrier which is rotatably supported on an inner ring via a one-way clutch. The sprocket set is preassembled by retainer pins each of which has an enlarged head engaging with an axially innermost sprocket of the set and penetrates through the set to project out from an axially outermost sprocket of the set in press-fit engagement therewith. A nut member is screwed on the sprocket ring to press the pin tip out of press-fit engagement with the outermost sprocket.

Abstract: A quick-release type clamping assembly for a bicycle hub comprising a tie rod having one end screwed to a nut and the other end provided with an enlarged head, the enlarged head being formed with a cam hole extending therethrough transversely of the rod as well as with a first threaded portion extending axially of the rod, a hollow presser member fitted around the enlarged head and movable relative thereto axially of the rod toward and away from the nut, a lever mounted to the presser member and pivotable about a pivotal axis between a clamping position and a releasing position, the lever having a cam portion received within the cam hole and eccentric relative to the pivotal axis so that the cam portion moves the presser member relative to the enlarged head axially of the rod in response to pivotal movement of the lever, a lock member having a second threaded portion adjustably screwed to the first threaded portion, and the lock member further having a stopper portion for abutment with the presser member to l

Abstract: A bicycle deraileur comprising a parallelogrammic linkage mechanism including a base member, a first link pivotally connected at one end thereof to the base member by a first pin, a second link pivotally connected at one end thereof to the base member by a second pin, and a movable member pivotally connected to the other ends of the first and second links by third and fourth pins respectively; a chain guide mechanism carried by the movable member; an operating member pivotally mounted on the firs pin for operation by a cable and provided with a pin; a torsion spring arranged on the first pin to engage with the operating member and the first link, the spring elastically urging the operating member to counteract a tension applied to the cable; and a restraining link pivotally connected at one end to the fourth pin and having a slot extending from the other end toward the fourth pin and slidably receiving the pin of the operating member.

Abstract: A bicycle caliper brake assembly comprising a pair of pivotal calipers respectively having bosses rotatably fitted on a support shaft as interposed between an intermediate flange of the shaft and a double nut adjustably screwed on the shaft, the bosses being axially movable relative to each other on the shaft to assume their respective preassembled and assembled positions, one of the calipers being formed with a projecting portion which engages the other caliper to prevent both calipers from pivoting away from each other more than a predetermined amount when the bosses assume the assembled position but which disengages from the other caliper to allow both calipers to pivot away from each other more than the predetermined amount when the bosses assume the preassembled position, a coil spring system completely enclosed within the bosses for urging the calipers to pivot away from each other when the bosses assume the assembled position, wherein the spring system is maintained in a state for torsional energizatio

Abstract: A bicycle speed change lever assembly comprising a fixed support shaft, a lever mount non-rotatably mounted on the support shaft, a control lever having a cylindrical boss portion rotatably mounted on the lever mount, a click ring mounted on the lever mount for co-rotation with the lever and having a plurality of differently patterned arcuate rows of clicking recesses, a non-rotatable retainer disposed on the lever mount in facing relation to the recesses of the click ring and loosely retaining steel balls in corresponding relation to the rows of clicking recesses, and a rotationally operable mode selector disposed in facing relation to a front or outward surface of the retainer and having at least one backup portion for forcing a selected one of the balls into elastic abutment with the click ring, wherein one of the differently patterned arcuate rows of clicking recesses is selected when in use.

Abstract: A bicycle caliper brake assembly having a first caliper having a connecting portion provided with a boss rotatably and axially movably receiving a rotary member. A second caliper includes a connecting portion connected to an outer cable of a double type control cable. A pivotal adjusting lever is provided for rotating the rotary member. A cable retainer is eccentrically mounted on the rotary member and connected to an inner cable of the control cable. The boss is formed at one end face thereof with a first annular row of teeth. The rotary member is formed with a second annular row of teeth engageable with and disengageable from the first row of teeth in response to axial movement of the rotary member. A corrugated ring spring is provided which is interposed between the lever and the other end face of the boss.

Abstract: A bicycle speed change lever assembly comprising a fixed support shaft, a control lever having a boss portion rotatably supported by the shaft, a click ring co-rotatable with the boss portion of the control lever and provided on one side surface thereof with an arcuate row of clicking recesses, a retainer non-rotatably supported by the shaft in facing relation to the one side surface of the click ring and loosely retaining steel balls in corresponding relation to the row of clicking recesses of the click ring, and a mode selector disposed in facing relation to the retainer and having backup portions for forcing the balls into clicking engagement with the row of clicking recesses and shelter recesses for allowing the balls to retreat thereinto.

Abstract: A front bicycle derailleur for shifting a drive chain on a front gear including a smallest sprocket, an intermediate sprocket, and a largest sprocket, comprising a pair of parallel inner and outer guide plates opposed to each other with the drive chain interposed therebetween at a part positioned in a path of movement of the drive chain toward the front gear, and a control mechanism for laterally translating the guide plates to shift up and down the drive chain on the front gear, wherein the inner guide plate provides a first portion pressing the chain for shifting it from the smallest sprocket to the intermediate sprocket and a second portion pressing the chain for shifting it from the intermediate sprocket to the largest sprocket, the second chain pressing portion being positioned outside of an arc of an imaginary circle concentric with the sprockets of the gear and which arc passes through the first chain pressing portion.