Abstract: A chain shifting assembly for bicycles includes a fixed member fixed to the bicycle frame and an operation member is pivotally connected to the fixed member. The operation member includes first, second and third arms wherein one end of a shifting member is connected to the first arm and a derailleur cable is fixed to the second arm or the third arm. The arms radially extend outwardly from the junction pivotally connecting the operation member and the fixed member. A shift frame is connected to the other end of the shifting member. An angle limitation member is pivotally connected to the fixed member and the shifting member respectively. A spring is connected between the fixed member and the angle limitation member. The operation member is rotated about a center thereof and the track of the shift frame is a parabola so as to smoothly shift the chain among the sprockets.

Abstract: A chain shifting assembly for bicycles includes a fixed member fixed to the bicycle frame and an operation member is pivotally connected to the fixed member. The operation member includes three arms wherein a shifting member is connected to a fixed arm and a derailleur cable is fixed to a second arm. A shift frame is connected to the other end of the shifting member. An angle limitation member is pivotally connected to the fixed member and the shifting member respectively. A spring is connected between the fixed member and the angle limitation member. The operation member is rotated about a center thereof and the track of the shifting frame is a parabola so as to smoothly shift chain among the sprockets.

Abstract: A bicycle speed change operation assembly (A) of the present invention has a rotatable operation member (2) and is connected to a speed change device of the bicycle via a control cable (C), wherein the assembly includes a first link (3) and a second link (4). An end (3b) of the first link (3) and an end (4b) of the second link are connected for relative pivotal movement. The other end (3a) of the first link 3 is supported so as to be moved circumferentially of the operation member (2) upon rotation thereof. The other end (4a) of the second link (4) is pivotally supported at a fixed point, and an end of the control cable (C) is connected to the second link (4).

Abstract: A bicycle speed change operation device includes a built-in stepwise positioning mechanism which is capable of setting an appropriate overshift for each speed step. The speed change operation device includes a support member, an operation member supported for rotation about an axis of the support member and operated to pull and pay out one end of a cable, an engaging member provided on one of the support member and the operation member, and a positioning member (7) provided on the other of the support member and the operation member and having plural engaging portions (72a-72c). The engaging member successively comes into elastic positioning engagement with the plural engaging portions (72a-72c) upon rotation of the operation member. The positioning member (7) is divided into plural parts (7a, 7b), and the plural engaging portions (72a-72c) are divided into plural groups each carried by a divided part of the positioning member.

Abstract: A bicycle rear derailleur is provided for shifting a chain from one sprocket to another of a multiple freewheel which includes a plurality of sprockets each having a lowermost edge portion. The derailleur comprises a control mechanism pivotally mounted to a bicycle frame by a first pivot shaft which is parallel to the hub shaft, and a chain guide pivotally mounted to the control mechanism by a second pivot shaft which is parallel to the hub shaft. The chain guide rotatably supports an upper guide wheel and a lower tension wheel. The chain guide is biased in a chain tensioning direction by a spring and controlled by the control mechanism to move axially of the hub shaft. The guide wheel has an uppermost edge portion located ahead of the lowermost edge portion of each sprocket which the chain engages. The control mechanism is freely pivotable about the first pivot shaft without any spring bias at least within a predetermined range.

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 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 freewheel assembly comprising a hollow external body relatively rotatable with and radially spaced apart from a hollow internal body, a first dust protective member including a horizontal tubular body and an annular vertical flange and secured to the alternative of the internal body or the external body at one side of the the freewheel assembly, a second dust protective member including a horizontal tubular body and an annular vertical flange and secured to the alternative of the external body or a lock nut mounted on the internal body at the other side of the freewheel assembly, a first narrow clearance formed between the first dust protective member and the alternative of the internal body or the external body at the one side of the freewheel assembly, a second narrow clearance formed between the second dust protective member and the alternative of the external body or the lock nut at the other side of the freewheel assembly, and each of the first and the second clearances being L-shaped or hook-s

Abstract: A caliper brake assembly comprising a pair of pivotal caliper arms operatively connected to a remote brake lever via a double type control cable consisting of an inner cable and an outer cable, a brake shoe mounted to a lower end of each of the caliper arms, a return spring for urging each of the caliper arms to take its normal release position when the brake lever is in its rest position, the pair of caliper arms being arranged so as to bring the brake shoes into braking contact with the bicycle wheel when the brake lever is operated to pull the inner cable, wherein at least one of the pair of caliper arms has an auxiliary braking element adapted to automatically come into braking contact with the bicycle wheel when the inner cable is freed from tension.

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 bicycle derailleur comprises a stationary member to be fixed to a bicycle frame, a first shaft integral with and extending from the stationary member, a spring-biased swing member pivotally supported at one end by the first shaft, a second shaft extending through the swing member at a position spaced apart from the first shaft in parallel relation with respect to the first shaft and in relatively rotatable relation with respect to the swing member, a movable member fixedly connected to and carried by the second shaft, and a restricting mechanism for restricting the second shaft from rotating about its own axis, so that a chain guide, which is operatively supported by the movable member, can move laterally with maintaining a certain constant positional relation with respect to a multi-speed driving gears of a bicycle.

Abstract: In a double assembly for bicycle speed control including a first lever for operating a rear derailleur by means of a control cable in order to shift an endless drive chain from one rear sprocket to a selected rear sprocket of a multiple freewheel, and a second lever for operating a front derailleur by means of a further control cable in order to shift the chain from one front sprocket to another front sprocket of a chainwheel, pivotal motion of the first lever causes synchronous sliding motion of the second lever through a motion converting mechanism so as to automatically center a guide cage of the front derailleur over a chain line thereby to prevent the chain from hitting the inside of the guide cage.

Abstract: In a ball head lock nut as a component element of bicycle head parts, a split clamping ring is received within an annular groove formed in a threaded, cylindrical internal wall of a substantially annular nut body; a deformable fixing piece, which has a diametrically extending slot formed in its inner end wall, is disposed within a radially extending threaded through hole formed in the annular nut body, with the slot engaged with a part of the split clamping ring; and a set screw is screwed into the radially extending threaded through hole to push the deformable fixing piece axially inwardly for forcible compression and deformation.

Abstract: A bicycle pedal comprises a pedal spindle rotatably supporting a pedal body, at least one spring member being engaged with the pedal body so as to absorb shocks caused by axial impact forces imparted to the pedal.

Abstract: A variable-speed bicycle comprises a multi-stage freewheel assembly with two or three sprockets mounted on a rear wheel hub, a rear derailleur is adapted to cooperate with the freewheel assembly for switching over a chain from one sprocket onto another, and an action converter is provided for converting a tension force of one direction into a thrust force of a transverse direction thereto. The derailleur comprising a horizontal support shaft mounted to a bracket, a tensioner mounted on the shaft, and a helical spring surrounding the shaft and interposed between the tensioner and the bracket. The tensioner is axially slidable on the shaft as well as rotatable about the shaft under the function of the spring, the action converter comprising a push arm disposed operatively in contact with the tensioner for imparting the thrust force thereto, all of the above constituent elements are housed within a gear case.

Abstract: A shift lever device for use with a bicycle comprises a bracket having a pair of spaced walls, a stepped slide shaft slidably mounted on the bracket and formed with a plurality of stepwise reduced cylindrical sections of different diameter, a push-button mounted to one end of the slide shaft, a coil spring interposed between the push-button and one of the pair of walls for urging the slide shaft in one direction, and a lever pivotally mounted on a support shaft supported by the bracket. A base portion of the lever is interposed between the pair of spaced walls and provided with a contact surface which is operatively contactable with a selected one of the plurality of stepwise reduced cylindrical sections of the stepped slide shaft.

Abstract: A bicycle free wheel hub with coaster brake adapted to be actuated by back-pedalling, comprising a clutch cone which has a clutch surface at its outward end and a brake-shoe expanding surface at its inward end, and is provided with an axial hole having an internal non-smooth surface, a plurality of slits which are formed in an inward portion of an anchor member fixedly mounted on a stationary axle, and a plurality of detent pieces which are respectively disposed within the slits for restricting a plurality of brake shoes from circumferential motion and are arranged so that they are elastically urged radially by a spring member for frictionally engaging each one end of the detent pieces with the non-smooth surface of the clutch cone.