Abstract: A gas actuating device includes a housing having a gas applying chamber, an actuator chamber and a gas applying passage for communicating gas from the gas applying chamber to the actuator chamber. An actuating member having a first side and a second side is disposed in the actuator chamber, wherein the first side of the actuating member receives gas pressure from gas applied to the actuating chamber from the gas applying passage. The actuating member moves in a first direction in response to the gas pressure applied to the first side of the actuating member. A valve selectively communicates compressed gas from the gas applying chamber to the actuator chamber through the gas applying passage for moving the actuating member in the first direction, and a gas release passage communicates gas from the actuator chamber at the first side of the actuating member to an outside of the actuator chamber.

Abstract: A derailleur cable router is provided for changing the direction of a derailleur cable having a cable housing surrounding at least a portion of the derailleur cable. The derailleur cable router includes a base member, a pulley mounted on the base member for rotation around a pulley axis, and a housing support movably supported on the base member. The housing support pivots relative to the pulley around a first axis and a second axis, wherein the first axis is different from the second axis.

Abstract: A damper that functions in cooperation with the chain take-up to introduce improved smoothness during bicycle operation. The hydraulic damper is a cylinder that has a spring driven piston mounted in it. The spring is controlled by a fluid within the cylinder. This fluid smoothes out or otherwise controls jerky or other unwanted vibration by applying fluid forces to the take-up piston so that a relatively constant pressure is applied against the drive chain. This allows that chain to flow over the sprockets and chain slides without, looseness, unintentional gear shifts or objectionable noise.

Abstract: A front derailleur for a bicycle is provided to move or shift a chain between two or more sprockets for changing gears. The front derailleur can be connected to the shift cable such that the shift cable is pulled upwardly or downwardly relative to the bicycle frame. The front derailleur has a fixed member adapted to be coupled to a portion of the bicycle, a chain guide for shifting the chain of the bicycle and a linkage assembly coupled between the fixed member and the chain guide. The chain guide is located above the fixed member and a coil spring is used to bias the chain guide from an extended position to a retracted position. A detachable guide member is removably coupled to the linkage assembly for guiding the shift cable downwardly and then upwardly relative to the bicycle frame for use with an upwardly pulled shift cable. If the detachable guide member is removed, then the shift cable is only pulled downwardly relative to the bicycle frame for use with a downwardly pulled shift cable.

Abstract: A parallelogram link mechanism of a bicycle derailleur has a coil spring tensioned from a first axis of the parallelogram to another axis thereof that is diametrically opposed to the first axis. The coil spring exerts a primary spring force against the rider-supplied derailleur actuation force throughout the actuation range of the derailleur. A secondary member exerts a secondary force throughout a portion of the actuation range of the derailleur, producing a substantially constant resultant actuation force experienced by the rider. The secondary member can take various forms, including an abutment member which selectively abuts the coil spring at an angle to the spring axis; a second spring internal to the first; a member which is attached to spaced-apart coils of the coil spring to limit their linear expansion; and an internal member which limits constriction of a segment of the coil spring inwardly toward the spring axis.

Abstract: A gas actuated derailleur for a bicycle includes a base member, a movable member supporting a chain guide, a coupling mechanism coupling the base member to the movable member so that the movable member moves relative to the base member, and an actuation mechanism responsive to compressed gas for causing the movable member to move relative to the base member.

Abstract: An automatic gearshifting device of a bicycle multi-stage fly wheel is composed of a main body, a rotary shaft, an urging member, a plurality of weights located in a receiving cell of the main body, and a drive chain guiding mechanism. The rotary shaft is fastened pivotally with the main body. The urging member is slidably mounted on the rotary shaft such that the urging member is capable of being actuated by the centrifugal force of the weights in motion to slide in the direction of the longitudinal axis of the rotary shaft so as to enable the drive chain guiding mechanism to shift the drive chain from one tooth to another tooth of the bicycle multi-stage fly wheel gear cluster.

Abstract: A device for switching a chain on different sprockets of a pedal bearing mounted to a seat tube of a frame of a bicycle. The chain switching device includes a cage which can be economically manufactured in a plurality of constructions and readily mounted on different bicycle frames with different angles between a seat tube and a chain brace in order to achieve optimum operating angles with appropriately modified cages. The different cage constructions are manufactured from a single sheet metal blank and have brackets arranged at different positions and of different lengths which are formed by appropriately positioning their bending edges to attach the cage to a parallel guide device.

Abstract: A rear derailleur includes a transformable linkage mechanism including a base member, two linkage members and a movable member. A chain guide is supported to the movable member and is provided with a guide pulley for guiding the chain among the plurality of sprockets. The linkage members are connected to the base member and to the movable member through connecting pins, wherein the connecting pins are slanted with respect to a plane perpendicular to an axis of the plurality of sprockets so that, when the linkage mechanism is transformed, the chain guide moves axially and radially of the plurality of sprockets. A return spring is provided for biasing the chain guide laterally inwardly with respect to the bicycle. A first horizontal shaft swingably supports the base member to a fixing member of the bicycle, and a second horizontal shaft swingably supports the chain guide to the movable member.

Abstract: A bicycle derailleur for attachment to a bicycle frame includes a base member apparatus having a first projection and a coupling member for coupling the base member apparatus to the bicycle frame. A chain guide is coupled to the base member apparatus for movement relative to the base member apparatus and for guiding a chain among a plurality of sprockets. The first projection is adapted to rotate relative to a second projection formed on a second member facing the first projection when the base member apparatus is mounted to the bicycle, and a shock absorber is adapted to be disposed between the first projection and the second projection for absorbing shocks between the first projection and the second projection.

Abstract: A combination bicycle derailleur and one-piece cover therefor, includes a derailleur having a chain cage, a cage securing member connected with the chain cage, a derailleur clamping head for clamping the derailleur to the bicycle frame, and a controller for actuating the chain cage, the controller including link arms pivotally connected to the derailleur clamping head and cage securing member, with the cable being connected to one link arm.

Abstract: A quick-release bicycle derailleur includes a base member, a movable member supporting a chain guide, and a linkage mechanism coupling the base member to the movable member so that the movable member moves relative to the base member. A draw bar extends from the base member and has a cam follower at the base member. A rotary cam is supported by the base member and contacts the cam follower so that rotation of the rotary cam pulls the drawbar into the base member. A nut may be fitted to the other end of the draw bar so that the base member and the nut securely fix the derailleur to a pair of fork ends on the bicycle frame.

Abstract: A rear derailleur for a bicycle includes a base member for fixing to a bicycle frame, a movable member for supporting a chain guide, and a linkage mechanism coupling the base member to the movable member so that the movable member is capable of movement relative to the base member. A roller is coupled to the base member for rotation about a rotation axis, wherein the roller includes a cable guiding surface for guiding an inner wire of a control cable. A casing support is provided for supporting an outer casing of the control cable, and a pivot coupling pivotally supports the casing support to the base member so that the casing support pivots around a pivot axis that is spaced apart from the rotation axis.

Abstract: A bicycle derailleur includes a base member, a movable member supporting a chain guide, and a first link having first and second ends. The first end of the first link is movably mounted to the base member, and the second end of the first link is movably mounted to the movable member. A bias spring exerts a bias spring force on one side of a longitudinal axis of the first link and directed away from the movable member, and a control element is coupled to the first link for exerting a control element force on an opposite side of the longitudinal axis of the first link and directed away from the movable member. The spring and control element forces thus act primarily on the connection between the first link and the base member, thus relieving the forces from the connections between other derailleur components.

Abstract: A gear shift apparatus for bicycles of the kind conventionally known as a derailleur is provided with a selectively actuable master cylinder operatively connected to a slave cylinder. The slave cylinder is mounted in a four-bar-linkage connected to a drive chain guide sprocket such that forces acting transversely of the slave cylinder are substantially avoided.

Abstract: An improved rear derailleur for changing the gear ratio of a bicycle is disclosed. It includes a fixed member, a movable member, a parallelogram mechanism connecting the fixed member with the movable member, and a cable adjusting screw which is screwed to a screw socket fixed on the fixed member. The cable adjusting screw is connected to a first end of a cable, wherein the cable has a second end fixed to a movable member. The cam member comprises a guiding surface for guiding the cable between the cable adjusting screw and the movable member. The guiding surface of the cam member is structured substantially coinciding a portion of a fictitious circle centered at a rotating pin which connects an outer linkage of the parallelogram with a second end of the fixed member.

Abstract: A rear derailleur for a bicycle includes a base member for attaching the derailleur to the bicycle, a movable member for supporting a chain guide, a linkage mechanism coupling the base member to the movable member so that the movable member is capable of movement relative to the base member, a biasing mechanism for biasing the movable member toward a wheel of the bicycle, and an actuating member for coupling to a control cable of the type having an inner wire that slides within an outer casing so that pulling the inner wire causes the movable member to move away from the rear wheel of the bicycle against the biasing of the biasing mechanism and releasing the control cable causes the movable member to move toward the rear wheel of the bicycle in accordance with the biasing of the biasing mechanism.

Abstract: A cable operated control device includes a movable control member, a frame coupled to the movable control member, and a cable guide member mounted to the frame for rotation around a guide member axis. The cable guide member includes a curved outer peripheral cable guide surface disposed radially outwardly from the guide member axis for guiding the cable. A bearing having a cable guide surface is disposed radially outwardly from the outer peripheral cable guide surface. When the cable guide member has a small radius of curvature, the cable may contact the bearing and thus avoid the excessive friction encountered in the prior art.

Abstract: A bicycle front derailleur with a cam level for smoother gear switching is disclosed. The bicycle derailleur is operated by pulling a wire which shifts a chain between at least a large sprocket, a medium sprocket and a small sprocket. The bicycle front derailleur contains a cam lever which is pivotably connected to a four-linkage chain guide moving system at a pivoting point for pulling the chain guide moving system, and thus shifting the chain, when a cable is pulled in a pulling direction. The cam lever has a cam groove formed on the peripheral surface of the cam lever for receiving the wire. The cam lever is structured such that the radial distance between the cam groove and the pivoting point increases in a direction opposite of the pulling direction, so as to provide a greater effective length vertical to the pulling direction when the wire is subject to a greater linear displacement resulting in a greater counterforce.

Abstract: A bicycle front derailleur includes a base member for attachment to a bicycle frame, a chain guide for guiding a chain laterally inwardly and outwardly of the bicycle frame, an inner link member having a first end pivotably coupled to the base member and a second end coupled to the chain guide, an outer link member having a first end pivotably coupled to the base member and a second end coupled to the chain guide, biasing means for biasing the chain guide laterally inwardly, and an actuating arm fixed to the outer link member for integral movement therewith. The actuating arm extends laterally outwardly from the outer link member so that pulling the actuating arm upwardly causes the chain guide to move laterally outwardly.

Abstract: A bicycle chain derailleur is biased against the movement of a cable by a first spring that has enhanced biasing characteristics. In accordance with one embodiment of the present invention, the enhanced biasing characteristics are provided by the addition of a second spring element, where the second spring is an elastomer coating formed on coils of the first spring. In another embodiment a torsion spring is disposed in the chain derailleur which works in concert with the first spring to enhance the biasing characteristics. In yet another embodiment, both the elastomer coating and the torsion spring are employed.

Abstract: An auxiliary chain tension system for a rear derailleur in a bicycle, the auxiliary chain tension system being composed of: an elongated member having two opposed ends, one end being formed to secure the member in a fixed position relative to the rear wheel fork of the bicycle so that the other end extends rearwardly from the rear wheel fork, the other end of the elongated member being formed to retain; a spring retention member securable to a pulley shield of the derailleur; and a tension spring having a first end connectable to the other end of the elongated member and a second end connectable to the spring retention member for imposing an auxiliary tension force on the bicycle drive chain.

Abstract: A front derailleur includes a base member for connecting to a bicycle frame, a first link pivotably connected to the base member at a first base member connection location, and a second link pivotably connected to the base member at a second base member connection location. An inner chain guide is pivotably connected to the first link at a first inner chain guide connection location and to the second link at a second inner chain guide connection location so that the inner chain guide moves laterally when the first link and the second link pivot relative to the base member. An outer chain guide is pivotably connected to at least one of the first link or the second link at a first outer chain guide connection location which differs from the corresponding first inner chain guide connection location or second inner chain guide connection location so that the outer chain guide moves laterally when the first link and the second link pivot relative to the base member.

Abstract: A front derailleur for a bicycle has a four-point link mechanism, and a control cable is attached by a screw to an end of a connecting arm fixed to one link of the four-point link mechanism. The connecting arm has an auxiliary projection. The control cable applies a torque to the link at a point of contact between the control cable and the auxiliary projection. The screw on the connecting arm is spaced from a chain guide which contacts a chain, to facilitate an operation to attach the control cable to the connecting arm.

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 derailleur operable by a control cable to shift a chain between a large gear and a small gear, includes a parallelogram link mechanism having a base member connectable to a bicycle frame, a support member, and a pair of pivotal links extending between the support member and the base member, and a return spring for biasing the support member in one direction. A shift control member connectable to the control cable is supported by the parallelogram link mechanism to be displaceable relative thereto between a first position for contacting the parallelogram link mechanism and a second position separated therefrom. The return spring is a tension coil type spring connected at one end thereof to the shift control member and at the other end to the parallelogram link mechanism. The return spring biases the support member in one direction through the shift control member.

Abstract: A front or rear derailleur for a bicycle comprising a base, an actuating assembly and a generally U-shaped chain guide. The base is a cylindrically shaped portion of flexible material that attaches the derailleur to a host frame member of a bicycle. The actuating assembly includes an actuating arm, two actuating links, a lip, a spring and adjusting screws. The actuating assembly responds to tension from an attached shifting cable, which in turn varies the compression on the spring, forcing a first actuating link to move outwardly from, or inwardly toward, the base. The chain guide, which is integral with the actuating link, moves concomitantly with the first actuating link. The second actuating link is formed between the base and the chain guide, and maintains the chain guide in a position parallel to the host frame member of the bicycle.

Abstract: A rear derailleur for a bicycle comprises a hub axis, a mounting member, a bracket body supported by the mounting member to be pivotal about a first axis extending substantially parallel to the hub axis, and a support member disposed forwardly of the bracket member for supporting a chain guide wheel and a chain tension wheel to be pivotal about a second axis extending substantially parallel to the first axis. The derailleur further comprises a pair of pivot links interconnecting the bracket member and the support member and arranged substantially parallel to a first phantom line extending through the first axis and the second axis as seen in a direction along the hub axis, and first and second tension springs for biasing the bracket member to pivot relative to the bicycle frame and for biasing the chain guide wheel and the chain tension wheel to pivot relative to the support member, respectively, to thereby apply a tension to a chain.

Abstract: An actuating mechanism for a multispeed cycle hub comprises a housing adapted to be attached to an end of a hub shaft. A first cam, a second cam, and a pinion having engaging teeth are received in the housing for conjoint rotation. An elongated rack element is mounted for movement along an axis in the housing and is adapted to be coupled to a speed-selection device by a force-transmission member and includes a row of teeth in driving engagement with the engaging teeth of the pinion. A first pivot lever is pivotally mounted in the housing in constant contact with the first cam so as to follow a pivoting motion defined by the shape of the first cam and engages one of two speedchange elements, which are coupled to the transmission in the hub, so as to move the first speed change element upon pivotal movement in response to rotation of the first cam.

Abstract: The following technical means is provided to achieve a chain shift operation with a minimum of the guide pulley travel distance, to improve speed change efficiency and operatability, and to prevent the speed change assembly from protruding sideward:At a forward location of a sprocket cluster (2), a link base (8) of a pantograph link mechanism (12) is supported by a chain stay (7), and from this, an inner link (9) and an outer link (10) are extended. To respective free end portions of these links, there is connected a movable member (11), which pivotally supports a chain guide (15) which is elastically urged. The guide pulley travel control means (18) functions in such a way that when the pantograph link mechanism (12) is deformed, it would cause a guide pulley (13) of the chain guide (15) to move inward axially of the hub shaft and at the same time forwardly downward substantially along a radial path of the sprocket cluster (2).

Abstract: An improved bicycle derailleur mechanism generally includes a bracket with two parallel spaced lugs extending perpendicularly therefrom, obliquely positioned on a first pivot member so that an inner cable extending through an adjuster nipple to a cable clamp on a parallelogram body is retained at a same angle when tension in the cable is adjusted by rotating the adjuster nipple, resulting in alignment between the derailleur mechanism and sprockets on a bicycle rear wheel remaining unchanged.

Abstract: The present invention provides a bicycle front derailleur comprising: a movable member including an inner and outer guide plates opposed to each other to define a guide space through which a chain runs; the movable member being moved laterally of a bicycle for shifting the chain. For a purpose of preventing the chain from being caught or damaged by a chain entering edge of the movable member, a following techincal measure is employed: The movable member is provided with catch preventive measure for preventing the chain from being caught by the cain entering edge of the movable member when the chain enters the guide space between the inner and outer guide plates.

Abstract: With an object of decreasing the size and weight of a derailleur and a control lever assembly by decreasing a difference in an elastic returning force between a beginning and ending phases of the pantograph link mechanism's deformation, the following technical is provided: The parallelogram pantograph link mechanism (7) is provided with a first and second pivotal members (12, 13) each having a predetermined length and pivoted to a predetermined position of a different constituent member of the parallelogram pantograph link mechanism (7), and respective ends of the first and second pivotal members (12, 13) are mutually connected by a pin for causing the first and second pivotal members (12, 13) to pivot relatively to the members to which they are respectively pivoted when the parallelogram pantograph link mechanism (7) is deformed; and a return spring (15) is provided between the first or second pivotal member (12 or 13) and a selected one of the constituent members of the parallelogram pantograph (15).

Abstract: The present invention provides a bicycle speed change assembly comprising: a pantogtaph link mechanism including a link base supported on a chain stay ahead of a sprocket cluster mounted on a hub shaft, inner and outer link members each extending rearward, and having a base end pivoted by a connecting pin to the link base, and a movable member pivoted by connecting pins to respective free ends of the inner and outer link members; and a chain guide rotatably supporting a guide pulley and a tension pulley, the chain guide being supported on the movable member of the pantograph mechanism to pivot about an axis in parallel with the hub shaft while being elastically urged to tension a chain.

Abstract: The derailleur includes a relatively long, torsion-resisting bar extending below and generally along one of the two rear wheel-supporting bicycle frame members. The front end of said bar is held by a fastener secured to the bicycle frame adjacent the housing of the pedalling axle. The holder prevents the bar from rotating about its long axis. The rear end of the bar is movable transversely of the frame member by a remote control actuator. The rear end of said bar carries a drive chain idle transfer and a chain take-up device which serve to transfer the drive chain from one to another rear drive sprocket, while taking up the slack in the chain. The chain take-up device preferably comprises an elongated member supported by and extending alongside the bar, movable longitudinally along said bar and carrying at its rear end a drive chain engaging idle sprocket. The elongated member is biased rearwardly.

Abstract: A roller intake mechanism having an operating force amplifying device includes a cam (7) rotatable about an axis of an axle a plurality of rollers (8) displaceable with rotation of the cam, a roller case (9) for displaceably retaining the rollers, a brake drum (5) extending from a wheel hub (2), and a brake shoe (10) disposed between the rollers and brake drum for contacting the brake drum with displacement of the rollers. The amplifying device is formed as a clamping ring (18) having one end thereof operatively connected to a brake lever (100) through an interlocking wire (150), and the other end operatively connected to the cam. An intermediate portion of the ring is wound around a peripheral surface of the brake drum. Based on a primary operating force applied from the brake lever, the clamping ring clamps the brake drum, which produces a frictional force for allowing the clamping ring to take power from the brake drum, i.e. the wheel hub.

Abstract: A front derailleur is provided with a first pressing portion having an arc substantially coaxial with the front gears and including a first pressing point where a pressing operation of the chain engaging the small gear is started and a second pressing point where the shifting operation of the chain mounting the intermediate gear is completed when the chain is shifted from the small gear to the intermediate gear. The derailleur is further provided with a second pressing portion positioned radially outwardly of the front gears relative to the first pressing portion for pressing the chain when shifting from the intermediate gear to the large gear.

Abstract: The present invention provides a bicycle front derailleur comprising a base member fixed to the seat tube of a bicycle frame, an inner link member, an outer link member, and a movable member having a chain guide, these members being interconnected by pins to form a parallelogrammatic pantographic link mechanism. The link mechanism is biased by a spring so as to return the movable member toward a smallest sprocket of a multiple chainwheel included in a multi-chainwheel assembly, and is deformed against the spring by a cable for a speed change. The cable is connected to the free end of an actuating arm extending from the upper end of the inner link member toward the outer link member to upwardly pull and pivotally move the actuating arm.The actuating arm therefore forms no upward projection beyond the link mechanism, while the cable can be made to extend upward to a shift lever over a shortened distance with a reduced number of bent portions.

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: Chain control apparatus is provided for a bicycle having a chain journaled around spaced apart gears so as to have an upper run and a lower run wherein the chain control apparatus limits movement of the lower run in directions away from the upper run when the bicycle is operated in rough terrain or is used in jumping operations and wherein the chain control apparatus is mounted for permitting pivotal movement thereof around a generally horizontal axis and around at least one generally vertical axis.

Abstract: A rear derailleur for a bicycle. The conventional fixed part to which one end of the usual operating cable is attached in selectively movable to change the angle which the cable makes so as the increase or reduce the extent of transverse movement of the linkage for the same extent of angular movement of the lever.

Abstract: A multispeed bicycle hub is controlled by two speed change rods extending within a bore of the hub shaft towards one end of this bore. An operating mechanism is fixed on the respective end of the hub shaft. This operating mechanism comprises two cam discs acting onto the speed change rods. The cam discs are rotated by a transmission cable from a speed change switch. The cam discs are rotatable about a common cam disc axis by the transmission cable. The cam discs are provided with respective cam tracks which are located adjacent each other in the axial direction of the cam pivot axis. The circumferential extension of the cam tracks is substantially coextensive about the cam pivot axis. The cam tracks act upon respective intermediate levers which intermediate levers are in engagement with the speed change rods.

Abstract: An automatic derailleur shifter is disclosed which includes a hollow cylinder body and a piston rod movable within the cylinder. The piston rod carries a dual element piston within the cylinder body in a manner to permit substantially unrestricted fluid flow through the piston when the piston rod is moved in a first, upward direction and a greatly restricted fluid flow when the piston rod is moved in the second downward direction. A first, fixed piston element is fabricated of diameter less than the inner diameter of the cylinder to allow unrestricted fluid flow thereabout. A second, movable piston element is provided and below the fixed piston element includes a flared skirt for sliding, sealing engagement between the movable piston element and the cylinder. A small, restricted longitudinal channel is provided through the fixed piston element which terminates at its lower end at a circular channel.

Abstract: A derailleur for a bicycle is provided in which a support member is pivotally supported to a movable member of a linkage mechanism having a forcible movement mechanism. A chain guide is fixed to the support member at adjustable positions, so that the chain guide position can be adjusted by the forcible movement mechanism to change the moving direction of the chain guide. This enables the position of a guide pulley of the chain guide to be adjusted in position with respect to each sprocket of a multi-stage sprocket assembly.

Abstract: A derailleur is provided with locking devices in the form of bands or ratchets around the upper and lower pivoting members of the derailleur to hold the derailleur securely in place during use and thus preventing the bicycle chain from disengaging from the chain sprocket or the chain wheels. The locking devices are activated/deactivted by a hand lever mounted on the handle bar of the bicycle. A cable runs from the hand lever through a spring arrangement to other cables that are connected to the locking devices.

Abstract: A rear derailer for bicycles comprises a first body for fixing to the bicycle frame, a second body which carriers two chain-guide wheels and is connected to the first body by means which enable the second body to be displaced relative to the first body, a metal operating cable having one end fixed to the means for displacing the second body relative to the first body, and a cable-guide sheath provided at one end with a support element having a hemispherical end portion which is supported for rotation by a correspondingly-shaped seat formed in the first body. The support element is provided with a tubular extension for guiding the cable, the extension projecting from the hemispherical portion, passing through the first body, and extending almost to the fixed end of the cable.

Abstract: In a rear derailleur of the type including an articulated parallelogram joint, the axes of articulation of the two connecting rods of the articulated parallelogram to the upper body of the derailleur are inclined to the longitudinal plane of the bicycle in the position of mounting of the derailleur on the bicycle. These axes are also arranged with one outwardly of and higher than the other so that the plane containing them is also inclined to the axis of the rear wheel of the bicycle. It is possible to arrange for the lower body of the derailleur to be displaced when the chain is derailed, the chain transmission wheel being kept at a substantially constant distance from the sprocket which is engaged by the chain from time to time.

Abstract: A positioning device is provided for a bicycle derailleur, wherein a fixing member, having a bottom wall and a side wall, has a movable member movably supported thereto, with a plurality of engaging portions for setting the speed change stages of the bicycle being provided at one of the fixing member and the movable member and a retainer engageable with one of the engaging portions being provided at the other of the fixing member and the movable member. Connecting mechanisms are provided at the fixing member and movable member for connecting the positioning device to two members of the derailleur linkage mechanism which are movable relative to each other so that the positioning device is detachably mountable to the derailleur.

Abstract: A rear derailing device for bicycle gears comprises a first body intended to be fixed to the frame, a second body, a lower body for driving the bicycle chain, and an articulated parallelogram joint connecting the first body to the second body. The joint has end heads which are connected to the first body and the second body respectively by swivelling hinge connections. The two elements of each hinge connection have facing surfaces with frontal teeth which cooperate with each other to hold the two elements of the hinge connection in a preselected relative position. The elements can be locked in this position by a locking screw arranged to press the facing surfaces against each other.

Abstract: An adjusting mechanism which can adjust the axial portion of a chain guide at a bicycle derailleur by movement of a cylindrical holder, which is larger in diameter than a horizontal shaft supporting the chain guide, with respect to a housing at the movable member.