Abstract: A method for electronically servo-assisting a bicycle gearshift, including the steps of: a) driving an actuator of a bicycle gearshift to displace a chain of the gearshift in an axial direction with respect to a gearshift group comprising at least two sprockets; b) receiving information on the desired alignment between the chain and a predetermined sprocket of the gearshift group; and c) setting a biunique correspondence between the physical position of the actuator at step b) and a logic value associated with the gear ratio relative to the predetermined sprocket.

Abstract: The bicycle gear mechanism, in particular a rear wheel change mechanism, comprises a derailleur provided with a drive chain guide element. The derailleur comprises: an arm (2); a first attachment element (5), rotatingly constrained to the arm (2) by a first shaft (3), the first attachment element (5) being predisposed to connect the arm (2) to the bicycle frame; a second attachment element (6), rotatably constrained to the arm (2), the second attachment element (6) being predisposed to connect the arm (2) to an element (7) predisposed to guide the drive chain (30) of the bicycle; a mechanism predisposed to rotatingly connect the first shaft (3) and the second shaft (4); at least an actuator, operatively connected to the arm (2) and the bicycle frame, which actuator is predisposed to rotate the arm (2) about the first shaft (3).

Abstract: An apparatus for adjusting a position of a bicycle control device comprises a memory that stores a plurality of operating position values corresponding to a plurality of operating positions, a manually operated adjustment value providing unit that provides an adjustment value, and an updating unit. The updating unit provides a first updated operating position value from a first operating position value from the plurality of operating position values based on the adjustment value, and the updating unit provides a second updated operating position value from a different second operating position value from the plurality of operating position values based on the adjustment value.

Abstract: A gear changing mechanism is adapted to engage an endless chain in a chain drive. The mechanism includes a rotary shaft and a gear set located around the shaft. The gear set has a plurality of generally circular gears of different diameter adapted to mesh with the chain, and the gear set has a plurality of operating positions each corresponding to partial wrapping of the chain about a different one of the gears. Each gear is formed as a plurality of separate gear segments that align circumferentially to define the gear. The gear set also comprises a plurality of separately moveable supporting structures each of which has rigidly fixed thereto one gear segment from each of the gears. Mounting means are provided that mount each of the supporting structures to the shaft for rotation together with the shaft and for axial displacement along the shaft.

Abstract: The rear bicycle derailleur guides a chain to one of a plurality of rear sprockets. The rear derailleur includes a base member, a linkage assembly, a movable member, a chain guide, a biasing member, and a biasing member connection structure. The base member is mounted to the bicycle frame. The linkage assembly is rotatably linked to the base member and the movable member. The movable member is capable of movement toward or away from the frame by rotation of the linkage assembly. The chain guide is pivotally linked to the movable member. The biasing member biases the movable member relative to the base member. The biasing member connection structure attaches the biasing member in either of two different biasing states to selectively bias the movable member toward or away from the frame.

Abstract: The disclosed bicycle gearshift (20) includes a support member (22) configured for mounting on a bicycle frame, a driving member (24) for driving of a bicycle chain, and at least one articulation arm (28) to movably connect the driving member (24) to the support member (22). The articulation arm (28) is connected to at least one portion of the support member (22) and the driving member (24) so that it can rotate about a respective rotational axis (30a) through at least one respective connecting pin (40a) extending along the rotational axis (30a). At least one first rolling element (54) is operatively arranged in the radial direction between the connecting pin (40a), one of the articulation arms (28), the portion of the support member (22), and the driving member (24).

Abstract: A front speed change device comprises a base, a first linking rod, a second linking rod and a chain guide unit. The body serves to fix the body to a seat tube. The first linking rod has one end pivoted to the base and another end thereof is pivoted to the chain guide unit. The second linking rod has one end pivoted to the base and another end thereof is pivoted to the chain guide unit. The chain guide unit includes an outer guide sheet and an inner guide sheet. Two ends of the outer guide sheet are connected to the two ends of the inner guide sheet. A receiving body is formed therebetween for receiving a chain; and the outer guide sheet is formed with a first end surface, a second end surface, a third end surface and a fouth end surface.

Abstract: A gear-shifting apparatus is provided which does not require a position of a chain to be set with high precision, and which reduces a risk of the chain coming off an adjacent sprocket due to a quick gear shifting operation. The gear shifting system includes a derailer for changing the chain from one sprocket to another among a plurality of axially-arranged gear shifting sprockets, and a case for containing the gear shifting sprockets and the chain. The case is provided with a protruding part for preventing the chain from moving axially outwardly at an area too close to the case. The protruding part effectively prevents the chain from coming off from the adjacent sprocket by means of contact of the protruding part with the chain.

Abstract: A bicycle rear derailleur is provided with a base member, a movable member, a moving mechanism and an angular adjustment arrangement. The base member includes a first support portion and a first axle with the first support portion being pivotally mounted on the first axle. The movable member includes a second support portion, a chain guide and a second axle with the chain guide being pivotally mounted on the second support portion by the second axle. The moving mechanism is coupled between the first and second support portions. The angular adjustment arrangement is operatively coupled to either electrically pivot the first support portion relative to the first axle, or electrically pivot the chain guide relative to the second support portion when the moving mechanism is moved to move the second support portion of the movable member relative to the first support portion of the base member.

Abstract: A bicycle front derailleur motor unit assembly is provided that includes a motorized front derailleur mounting member and a motor unit. The front derailleur mounting member is configured to be mounted to a bicycle frame. The front derailleur mounting member includes a front derailleur mounting portion configured to be coupled to a linkage of a front derailleur and a motor unit mounting portion. The motor unit includes a motor unit housing configured to be removably coupled to the motor unit mounting portion and an output shaft configured to rotate about a rotation axis relative to the motor unit housing in first and second opposite rotational directions. The motor unit mounting portion and the motor unit housing include first and second fastener-less mating structures configured to resist rotational movement of the motor unit housing relative to the front derailleur mounting member due to a torque produced by the output shaft.

Abstract: A transmission includes a ball spline mechanism having an outer member which can rotate integrally with an inner member by means of balls housed in guide grooves and which can move in the axial direction; and a derailer which shifts a chain wrapped around a first sprocket moving integrally with the outer member from one transmission sprocket to another among a plurality of operating sprockets. The inner member and the outer member include guide surfaces through which the outer member is guided to move in the axial direction through the balls. The outer member is provided with a dust cover for covering the guide surfaces, regardless of the axial position of the first sprocket.

Abstract: Disclosed herein is a derailleur for a chain bicycle designed to move forward with either forward or reverse rotation of the bicycle's pedals. The chain bicycle comprises a single endless chain, first and second rear wheel sprocket assemblies, first and second one-way clutches to transmit power to a rear wheel hub in only a forward direction, and an idler roller. Any one sprocket of the second rear wheel sprocket assembly engages with the endless chain by using a pantograph linkage, and at the same time, any one sprocket of the first rear wheel sprocket assembly engages with the endless chain by using a chain hook member. The idler roller is coupled to a second base member via a plurality of joint shafts, so as to permit not only rotating, tilting and sliding motions thereof relative to any one joint shaft, but also elastic pivotal rotation in either clockwise or counterclockwise direction relative to another joint shaft parallel to a pedal shaft.

Abstract: A bicycle component is basically provided with a base member, a movable portion, a magnetic element and a position sensing device. The base member is configured to be attached to a bicycle. The movable portion is movably coupled to the base member, the movable portion including a plurality of predetermined operating positions. The magnetic element is attached to one of the base member and the movable portion. The position sensing device is attached to the other one of the base member and the movable portion. The position sensing device includes a sensor element being sensitive to a presence of a magnetic field to generate an analog signal, and an analog-to-digital conversion unit configured to convert the analog signal from the sensor element into a digital signal to identify one of the predetermined operating positions of the movable portion.

Abstract: A bicycle derailleur comprises a base member adapted to be mounted to a bicycle, a movable member movably coupled to the base member, and a chain guide coupled to the movable member. The chain guide is coupled for rotation around a rotational axis (X), and a biasing element biases the chain guide in a selected rotational direction. A resistance applying unit applies a resistance to rotational movement of the chain guide in a direction opposite the selected rotational direction, and an adjusting unit adjusts an amount of resistance applied by the resistance applying unit.

Abstract: A bicycle derailleur assembly that is mounted concentrically with an axle of a rear wheel assembly. The derailleur is constructed to be mounted to the bicycle such that the derailleur is pivotable about a common axis with the rear wheel and such that the rear wheel can be removed from the bicycle without interfering with the connection of the derailleur to the bicycle. The derailleur system provides a derailleur that is robust and reduces interference of the derailleur with the performance of bicycle maintenance.

Abstract: A gear reduction apparatus for a bicycle component comprises a gear support, a first gear coupled to the gear support for receiving rotational drive force from a drive component, and a second gear coupled to the gear support for communicating rotational drive force to a driven portion of the bicycle component. The first gear is operatively coupled to the second gear to communicate rotational drive force from the drive component to the driven portion of the bicycle component, and the first gear, the second gear and the gear support are coupled together so that the first gear, the second gear and the gear support may be coupled to and removed from the drive component and the driven portion of the bicycle component as a self-contained unit.

Abstract: A bicycle front derailleur includes a chain guide that is provided with a pushing element that is movable relative to the chain guide to assist in shifting a bicycle chain from a smaller front sprocket to an adjacent larger sprocket. The chain guide is part of a movable member that is movably coupled to a base member via a linkage assembly. The pushing element is rotatably coupled to the chain guide portion and activated by a chain to move relative to the inner chain guide member from a first position with the pushing element at rest to a second position in response to activation by the chain. The contact surface moves laterally outwardly into the chain receiving slot toward the outer chain guide member as the pushing element moves from the first position to the second position.

Abstract: A manually operated bicycle front derailleur assembly includes a linkage assembly, a lever member and a connecting link. The linkage assembly is supported to a fixing member and includes an inner link pivotally coupled to the fixing member at a first pivot point, an extension arm extending from proximate the first pivot point, an outer link pivotally coupled to the fixing member at a second pivot point, and a chain guide pivotally coupled to the inner and outer links to move between an inner shift position and an outer shift position. The lever member is pivotally supported relative to the fixing member and the bicycle frame spaced apart from the first and second pivot points. The connecting link operatively connects the lever member to the extension arm such that the linkage assembly moves in response to movement of the lever member.

Abstract: A derailleur including an articulated quadrilateral mechanism, having four parallel articulation axes is provided. At a first articulation axis, between a fixed member and a first connecting rod, the fixed member includes a first forked structure embracing the first connecting rod. The first forked structure includes two opposite flanges having respective holes aligned along the first articulation axis, and the first connecting rod includes a hole aligned with the first articulation axis. A pin is inserted through the two holes of the first forked structure and the first connecting rod. The use of the fixed member creates a more favorable distribution of the stresses induced in the first connecting rod and the pin by the traction of the derailleur control cable.

Abstract: A motorized bicycle front derailleur assembly is provided that includes a motor unit, a front derailleur and a motor linkage. The motor unit is configured to rotate an output shaft in first and second opposite rotational directions. The front derailleur includes a fixing body configured to be mounted to a bicycle frame, inner and outer links pivotally coupled to the fixing body at first and second pivot points, and a chain guide pivotally coupled to the inner and outer links to move between an inner shift position and an outer shift position. The first pivot point is located laterally closer to a center plane of the bicycle frame than the second pivot point. The motor linkage is operatively coupled to the output shaft of the motor unit and the inner link to move the chain guide between the inner and outer shift positions upon rotation of the output shaft.

Abstract: A bicycle front derailleur includes a fixing member, a chain guide and a linkage mechanism. The fixing member includes axially aligned first and second attachment flanges. The linkage mechanism couples the chain guide to the fixing member for movement between a retracted position and an extended position. The linkage mechanism includes a first link, a second link, a first pivot pin and a second pivot pin. The second link is rotatably coupled to the first and second attachment flanges. The first pivot pin rotatably couples the second link to the first attachment flange, and the second pivot pin rotatably couples the second link to the second attachment flange. One of the first and second pivot pins is retained in place at both ends, and the other is retained at one end only.

Abstract: A bicycle front derailleur includes a chain guide that is provided with a pushing element that is movable relative to the chain guide to assist in shifting a bicycle chain from a smaller front sprocket to an adjacent larger sprocket. The chain guide is part of a movable member that is movably coupled to a base member via a linkage assembly. The pushing element has a contact surface that preferably moves both laterally outwardly and longitudinally as the pushing element moves from a first position to a second position. Preferably, the pushing element is chain activated and arranged to move at least laterally outwardly by contacting a chain that is moving between inner and outer chain guide members of the movable member. Preferably, the pushing element is either a slidable member or a rotatable member.

Abstract: The present invention refers to a bicycle hub being part of the drive mechanism 1 of a BMX bicycle comprising: an axle 5, a first part 7 being seated on said axle 5 and being provided with or connected to a cog 6, a second part 8 being movable relative to said first part 7 in longitudinal and rotational direction of said axle 5, said first part 7 and said second part 8 being in contact with each other via a screw coupling provided by threads 7? and 8?, a hub body 11 being arranged around at least said second part 8, said second part 8 being provided with a first cone surface 9, said hub body 11 having a second cone 10 surface formed thereon or connected thereto, wherein said two cone surfaces 9, 10 are engageable for power transmission, wherein an adjustable stopper mechanism 12 is provided, limiting a gap providing space for an axial movement of said second part 8.

Abstract: Rocker arm assembly for the rear derailleur of a bicycle, comprising an outer plate carrying a pivot pin, an inner plate and a pair of idle transmission wheels arranged between the outer plate and the inner plate. The inner plate is made of metallic material and the outer plate is made of a structural fiber fabric incorporated in a thermoplastic material matrix.

Abstract: A bicycle front derailleur includes a fixed member, a movable member, a chain guide and a linking member. The fixed member is coupled to a bicycle frame. The movable member is movably coupled to the fixed member. The chain guide is coupled to the movable member and extends in a first direction approximately parallel with a lengthwise direction of the bicycle frame. The linking member extends between the fixed member and the movable member and is configured to move the chain guide in a second direction relative to the fixed member between at least a first position and a second position, the first and second directions crossing with an angle therebetween of between 50 and 70 degrees.

Abstract: A bicycle rear derailleur is provided that includes a base member, a movable member with a chain guide and a linkage mechanism. The linkage mechanism is coupled between the base member and a movable member to move the chain guide laterally. The base member is configured to be coupled to the bicycle frame. Preferably, at least part of the base member is configured and arranged to be rotatable about a pivot axis that is coincident with a center axis of a rear hub axle. Specifically, the base member preferably includes a fixing portion that is non-movably fixed to the frame and a derailleur support portion that is rotatable relative to the fixing portion. Moreover, the fixing portion preferably includes a cable support structure that is configured to support a derailleur control cable.

Abstract: A bicycle derailleur is basically provided with a base member, a linkage assembly movably coupled to the base member, a movable member movably coupled to the linkage assembly and a chain guide movably coupled to the movable member. The chain guide has a pair of cage plates, a first pulley rotatably supported between the cage plates and a second pulley rotatably supported between the cage plates. At least one of the cage plates includes a non-metallic cage body and at least one metallic insert. The metallic insert has a pulley axle receiving bore supporting one of the pulley axles of the pulleys and a fastening part at least partially embedded in the non-metallic cage body.

Abstract: A bicycle rear derailleur includes a base member, a movable member movably coupled to the base member and a chain guide coupled to the movable member. The base member is configured to be mounted to a bicycle portion. The base member includes a metal plate that is a one-piece member forming a stroke adjustment mounting structure, an angular position adjustment mounting structure and an outer casing adjustment mounting structure.

Abstract: A drive train system for human powered vehicles whereby the pedals move in a linear or slightly curved path, providing a superior ergonomic ride. Power is transmitted from the pedals by a flexible drive tension transmitting component to two one way locking continuous variable radius helicoids mounted on a shaft by means of a one way locking mechanism. The pedals move alternatively back and forth pulling the cables and unwinding (active phase) their corresponding helicoids and thus transferring spinning motion to the shaft. The helicoids act as a set of sprockets of continuous variable radius optimizing the ergonomic delivery of leg power to the shaft. A step-less shifting system alters the length of cable wound in the helicoids and can manually select the “zone” of the helicoids utilized for optimal power transmission. This gearing system can manually adjust the power-speed ratio according to the environment demands, akin to a gear system.

Abstract: An electric derailleur motor unit is provided for a motorized derailleur assembly. The electric derailleur motor unit has a derailleur motor support, a derailleur motor, a drive train and an output shaft. The derailleur motor is mounted to the derailleur motor support and has a driving shaft. The drive train has at least one intermediate gear operatively coupled to the driving shaft of the derailleur motor and a worm gear operatively coupled to the intermediate gear such that rotation of the driving shaft of the derailleur motor rotates the intermediate gear which in turn rotates the worm gear. The output shaft is operatively coupled to the derailleur motor and rotatably supported on the derailleur motor support. The output shaft has an output gear engaged with the worm gear of the drive train.

Abstract: A motorized bicycle gear shift device comprising a derailleur and an electric motor, associated directly with the derailleur, for controlling the derailleur and an electric transducer of absolute type, also associated with the derailleur for producing an electric signal indicative of the absolute position of the movable body of the derailleur.

Abstract: A bicycle base member adjustment assembly is provided for a base member of a rear derailleur. The bicycle base member adjustment assembly basically has a base member stopper plate, a biasing force adjustment member and a biasing force adjusting element. The biasing force adjusting element is operatively coupled between the base member stopper plate and the biasing force adjustment member to selectively set a relative angular position of the biasing force adjustment member relative to the base member stopper plate about a rotational axis of the base member. The base member stopper plate has a stopper that limits movement of the base member of the rear derailleur relative to the base member stopper plate. The biasing force adjustment member engages a biasing element of the base member of the rear derailleur. When the biasing force is adjusted, the position of the base member stopper plate is not changed.

Abstract: An electronically servo-assisted gearshift actuates a multiple gear-shifting that moves a chain from a current toothed wheel to a target toothed wheel not immediately adjacent to the current toothed wheel in a gearshift group having at least three toothed wheels. Actuating the multiple gear-shifting takes several steps (i) actuating a single gear-shifting to move the chain to a toothed wheel immediately adjacent to the current toothed wheel in the gear-shifting direction, and (ii) repeating step (i) until the immediately adjacent toothed wheel is the target toothed wheel.

Abstract: A bicycle gear assembly has first and second sets of cog wheels, each having at least three cog wheels of various sizes including a largest cog wheel and a smallest cog wheel. These two sets are oriented so that the largest cog wheel of the first set is aligned with the smallest cog wheel of the second set and the smallest cog wheel of the first set is aligned with the largest cog wheel of the second set, the first and the second sets of cog wheels define at least a first, second and third pair of substantially aligned cog wheels. Additionally, a chain is mounted about a first pair of the aligned cog wheels and a gear shift assembly is adapted to move the chain from the first pair of cogwheels to the second pair of cogwheels and from the second pair of cogwheels to the third pair of cogwheels.

Abstract: Rocker arm assembly for the rear derailleur of a bicycle, comprising an outer plate carrying a pivot pin, an inner plate and a pair of idle transmission wheels arranged between the outer plate and the inner plate. The inner plate is made of metallic material and the outer plate is made of a structural fiber fabric incorporated in a thermoplastic material matrix.

Abstract: A bicycle rear derailleur includes a mounting structure with an attachment element, a support element and a locking device. The attachment element is configured and arranged to be attached to a bicycle. The support element is pivotally coupled to the attachment element to move between a first position and a second position angularly spaced from the first position. The locking device is coupled between the attachment element and the support element, and the locking device is configured and arranged to selectively and releasably retain the support element in the second position.

Abstract: A bicycle derailleur mounting structure includes a base member and a stopper. The base member includes a first portion configured for attachment to a bicycle frame. The first portion of the base member has a first side surface and a second side surface with an aperture extending between the first and second side surfaces. The stopper is coupled to the base member between the first and second side surfaces. The stopper is configured for setting an angular position of the base member relative to the bicycle frame.

Abstract: An electric derailleur motor unit is provided for a motorized derailleur assembly. The electric derailleur motor unit has a derailleur motor support, a derailleur motor and an output shaft. The derailleur motor is mounted to the derailleur motor support. The output shaft is operatively coupled to the derailleur motor and rotatably supported on the derailleur motor support. The output shaft has an eccentric drive pin that is offset from a rotational axis of the output shaft. A drive train is provided between the derailleur motor and the output shaft. The drive train has at least one intermediate gear operatively coupled to the driving shaft of the derailleur motor and a worm gear operatively coupled to the intermediate gear such that rotation of the driving shaft of the derailleur motor rotates the intermediate gear which in turn rotates the worm gear.

Abstract: A motorized front derailleur mounting member is provided with a bicycle frame mounting portion, a front derailleur mounting portion, and a motor unit mounting portion. The bicycle frame mounting portion includes a front surface with a threaded hole configured and arranged to be coupled to a bicycle frame. The front derailleur mounting portion is configured and arranged to be coupled to a linkage of a front derailleur. The front derailleur mounting portion includes at least a first pivot point with a first pivot axis. The motor unit mounting portion configured and arranged to be coupled to a motor unit.

Abstract: A multiple sprocket chain guide includes a guide structure mounted onto the movable metal cage of a conventional front bicycle derailleur such that the entire guide structure moves between inner and outer gear positions with the movable cage. The guide structure includes opposing outer and inner guide plates and a bridge that is rigidly connected between the guide plates to define a chain guide channel for directing the bicycle's chain onto a selected front sprocket. When the derailleur is positioned to guide the chain onto the outer front sprocket, the outer guide plate is positioned over the outer bash guard such that a gap there between is smaller than the height of the chain, thereby preventing derailment. When the derailleur is positioned to guide the chain onto the inner front sprocket, the inner guide plate is positioned over an inner plate to prevent derailment in a similar manner.

Abstract: The invention relates to a compact installation gear with, for instance, a ?? derailleur chain and a derailleur for setting a transmission ratio between a crankshaft and a rear hub of a bicycle. To that end, the gear comprises a compact housing with the crankshaft included therein, with a slidable driving first sprocket engaging, via the derailleur chain, a selected second sprocket which forms part of a series of second sprockets mutually different in diameter, located on a secondary shaft with a third sprocket mounted thereon outside the housing, which, in turn, via a roller chain, drives a fourth sprocket on the rear hub. The transmission ratio can be set with the aid of the derailleur by moving the derailleur chain over the different second sprockets while at the same time moving the driving first sprocket to a position directly opposite the selected second sprocket.

Abstract: A speed change device of a bicycle comprises a body having a ring clamping portion and a driven portion; the driven portion being connected to a chain driving sheet; an L shape driven arm pivoted to the body; one end of the driven arm being installed with a connecting portion; and another end thereof being installed with a pivot portion; the pivot portion being pivoted to the chain driving sheet; wherein the chain driving sheet is driven by the driven arm to achieve the object of moving a chain received in the chain driving sheet and to change speed of a bicycle. A bending portion of the L shape driven arm has a cambered shape. The connecting portion of the driven arm receives a speed change rope.

Abstract: A bicycle front derailleur includes a fixed member, a chain guide, a linkage assembly and an adjustable mounting fixture. The fixed member includes a frame mounting portion having at least one frame mounting hole and a linkage support portion. The linkage assembly is coupled between the linkage support portion and the chain guide in order to move the chain guide between the retracted position and the extended position. The mounting fixture is adjustably coupled to the fixed member. The mounting fixture including at least one frame fastener disposed in the frame mounting hole, a pair of first washer members disposed on a first side of the frame mounting portion and a pair of second washer members disposed on a second side of the frame mounting portion with the frame fastener extending through the first and second washer members.

Abstract: A bicycle derailleur comprises a first base member structured to be detachably mounted to a bicycle frame, wherein the first base member has a first abutment; a second base member structured to be mounted to the first base member, wherein the second base member has a second abutment that faces the first abutment of the first base member and the first and second base members define a housing space between them; a drive mechanism at least partially disposed in the housing space; a link mechanism that moves in response to movement of the drive mechanism; a chain guide coupled to the link mechanism for moving a chain among a plurality of sprockets; and a misalignment inhibiting structure disposed between the first base member and the second base member to inhibit misalignment of the drive mechanism as a result of an external force.

Abstract: An apparatus for achieving the return of a chain to a rear derailleur tension pulley more easily by means of pedaling action when the chain falls off from the tension pulley is provided. The rear derailleur is equipped with a base component, a link mechanism, a movable component, Outer Plate 20, Inner Plate 21, Guide Pulley 22, Tension Pulley 23, and Chain Return Section 32. The base component is a component which is mounted on the frame. The link mechanism is a mechanism of which one end is mounted on the base component. The movable component is a component which is mounted on the other end of the link mechanism, and which can be relatively displaced from the base component. The outer plate is a component which is mounted on the movable component so as to undulate like a see-saw. The inner plate is a component which is installed so as to face the outer plate.

Abstract: A bicycle front derailleur includes a fixing member, a chain guide and a linkage mechanism. The fixing member includes axially aligned first and second attachment flanges. The linkage mechanism couples the chain guide to the fixing member for movement between a retracted position and an extended position. The linkage mechanism includes a first link, a second link, a first pivot pin and a second pivot pin. The second link is rotatably coupled to the first and second attachment flanges. The first pivot pin rotatably couples the second link to the first attachment flange, and the second pivot pin rotatably couples the second link to the second attachment flange. One of the first and second pivot pins is retained in place at both ends, and the other is retained at one end only.

Abstract: A bicycle front derailleur includes a fixed member, a chain guide and a linkage assembly. The fixed member includes a fixing body and a projection part fixedly coupled together. The fixing body includes a fastening portion with a seat tube reference plane that aligns with a longitudinal center axis of a seat tube when coupled thereto. The projection part has a projecting surface offset axially from the fixing body toward a smallest front chain ring of a bicycle front crankset. The projecting surface has an overall vertical height lying substantially in a single plane measured in a direction parallel to the seat tube reference plane that is greater than 10 millimeters in an area between the seat tube reference plane and 23 millimeters measured perpendicularly and forwardly from the seat tube reference plane.

Abstract: An electric derailleur has a motor unit having a derailleur motor with an output shaft, a position control mechanism and a controller. The output shaft is rotated through a moveable range including a first derailleur shift position and a second derailleur shift position. The position control mechanism is configured and arranged to provide a position signal indicative of an angular position of the output shaft. The controller detects a predetermined lockup position of the derailleur motor occurring at one of the first and second derailleur shift positions. The controller also sets a predetermined stop position for the derailleur motor that is calculated distance prior to the lockup position based on the position signal of the position control mechanism. Thus, the derailleur motor can be calibrated such that a new stop position is set that prevents an overcurrent from occurring in the motor.

Abstract: A transmission apparatus for a bicycle is capable of performing a transmission operation even while operating or running by the inertia of the bicycle. The transmission apparatus T for a bicycle includes a driving sprocket member rotationally driven by a crankshaft; a multi-stage driven sprocket member drivingly connected to the output shaft cooperatively engaged and rotated with the rear wheel; a chain applied over the driving sprocket member and the driven sprocket member; and a transmission changing-over mechanism M2 for positioning the chain among a plurality of transmission sprockets. The driven sprocket member is integrally arranged to always be rotated, and the one-way clutch for transmitting a rotation of the crankshaft to the driving sprocket member while in its normal rotating direction is arranged in the power transmitting path extending from the crankshaft to the driving sprocket member.

Abstract: A motorized bicycle front derailleur assembly is provided with an arrangement to protect the motor in the event the chain guide is stuck in one of the shift positions. The motorized bicycle front derailleur assembly has a motor unit, a front derailleur and a motor linkage. The motor unit has an output shaft that rotates between first and second rotational positions. The front derailleur includes a fixing body, a chain guide, and a derailleur linkage operatively coupled between the fixing body and the chain guide. The motor linkage is operatively coupled to the output shaft and the front derailleur linkage to move the chain guide in response to rotation of the output shaft. The motor linkage includes a jamming protection arrangement that is configured and arranged to move between a force transmitting state and a force override state.