Abstract: A main body has a partition wall provided in the interior of the main body and a communication hole formed in the wall. A valve body is disposed in the main body to be movable between a first position and a second position. At the first position the valve body closes the hole, and at the second position the valve body opens the hole. A spring urges the valve body into the second position. An operating lever is connected in a universal-joint fashion to the main body. A cam is formed on the lever and slidably contact with a cam contact element disposed on the valve body in a position away from a plane including a center axis of the main body. A pair of grooves are formed on the lever at each side of the cam and extend along the plane. A pair of projections are provided on the valve body and inserted into the grooves. When the lever is rotated in one or the other direction in the plane by an external force, the valve body is moved between the first and the second position by the action of the cam.

Abstract: A motorcycle throttle gripper having two friction levers with one friction lever positioned below the throttle grip hand control and closely mounted brake lever hand control and with one friction lever positioned above the throttle grip hand control and closely mounted brake lever hand control. On each of the two friction levers a rounded concave offset section seats on and grips the throttle grip hand control roughly similar to an external brake band or segment of a brake band around a brake drum or wheel. Also, on each of the two friction levers a straight section is mounted in sliding contact with the forward brake lever hand control. On the three embodiments of the invention the upper and lower friction levers are held in friction contact to the throttle grip hand control and the brake lever hand control by means of tension producing rubber bands, elastic members, or by means of tension producing springs, bolts, and self locking nuts.

Abstract: An end member positioned against the end of a handle bar is engageable with a throttle sleeve rotatably mounted upon the handle bar. The end member also includes an expansion member residing within the handle. A manually movable expander selectively moves the expansion member into frictional engagement with the inside surface of the handle bar for retaining the throttle sleeve at rotatably selective positions relative the handle bar.

Abstract: Drafting board apparatus features a dual-spring brake to enable the angle of tilt of the drafting board to be selectively altered. Use of oppositely-coiled springs secures the board against movement, while a control linkage enables near-simultaneous release of said springs to enable adjustment of the board.

Abstract: A disc-type valve assembly and method of making same. The assembly includes a valve body having a flowway with a disc-like valve element therein. A shaft has an inner portion directly rigidly connected to the valve element by a pre-stressed self-connection and an outer portion rotatably mounted in the valve body. A handle is directly rigidly connected to the outer portion of the shaft by a pre-stressed self-connection whereby the handle and shaft form a rotating body. A positioning sleeve is interposed in tight pre-stressed relation between the valve body and the rotating body for preventing relative rotation between the bodies under torque loads below a pre-determined magnitude, the positioning sleeve being yieldable under torque loads greater than or equal to that magnitude to permit such rotation.

Abstract: A steering column assembly having upper and lower telescoping shaft sections, a jacket surrounding the upper shaft section and an extensible deforming member surrounding the jacket and connected at one end thereto. A U-shaped clamp clamps onto the deforming member and is pivotably mounted to a mounting bracket. The deformable member slides through the clamp upon manual adjustment of the steeing shafts to form a steering column of a desired length but, upon impact, the clamp pivots with respect to the mounting bracket and increases its clamping force upon the deformable member to prevent sliding of the jacket.

Abstract: A brake cable operating lever is disclosed including a device for adjusting the cable tension which is produced when the operating lever is in the brake-on position, characterized in that the rotary tension adjusting screw (36) which extends axially of the operating lever includes intermediate its ends an annular collar portion (36a) that is rotatably supported by an abutment shoulder (20f) on the operating lever (20), whereby the apparatus remains operable even if the manual operating knob (38) were to be removed from the screw member. An internal friction producing device (40) is provided for restricting rotation of the screw member about its axis.

Abstract: A positioning device with a pivotable positioning member. The positioning member comprises a guide lug spaced from and parallel to its pivot axis, the guide lug having a head portion which may be introduced into an enlarged end of a guideway in a support but which maintains the positioning member parallel to the pivot axis. An abutment prevents the guide lug from re-entering the enlarged end of the guideway. A strip integrally formed with the positioning member has a protruding portion which bears against one side of the support tensioning the strip. The pivotal mounting is afforded by co-operable detents including a pivot pin (e.g. on the support) with a tapered end which snaps into an aperture defined by a pair of integrally formed flexible strips (e.g. on the positioning member). The oblong aperture permits the pivot pin to shift therein as the pointer at the other end of the positioning member undergoes substantially rectilinear displacement.

Abstract: A cruise control mounted on an accelerator control sleeve rotatably supported on a handle bar, and stabilized by a connection to the throttle cable. The cruise control has a body in the form of a split ring, with an over-center clamping actuator on one side to bring the body into frictional engagement with the sleeve, and a pivotal link on the opposite side permitting opening of the body for installation. A stabilizing tab is formed on the link to engage the throttle cable or cables, and a second form, without this link, has the tab on the body.

Abstract: A locking device includes an annular locking face formed on the inner surface of a casing and an annular lockable face opposed to the locking face and provided on a driven member turnably mounted on the casing. The lockable face is movable into pressing contact with the locking face to lock a lever when the lever is rotated and thereby screwed in toward one direction longitudinally thereof. The locking face and the lockable face are operable free of any local uneven wear, while the lever can be locked to the desired position and unlocked therefrom with high reliability at all times.

Abstract: A retaining clamp for an adjustable steering column of a motor vehicle comprises a bracket for mounting beneath the vehicle instrument panel, and a resilient seat member defining a seat for the column having two spaced apart arms extending towards the bracket and engaged between two bracket plates, the arms being tubular and formed with coaxial frusto-conical surfaces about an axis perpendicular to the steering column axis, each surface being engaged with a cooperating frusto-conical surface associated with a respective bracket plate.

Abstract: An externally threaded mandrel extends from one end of the inner tube of a pair of telescoping tubes and is staked thereto. A trifurcated collet threads on the mandrel whereby a conical exterior surface on the mandrel cooperates with a conical interior surface of the collet. Longitudinal ridges on the inner surface of the outer tube interlock with longitudinal grooves on the collet preventing relative motion between the outer tube and the collet while permitting longitudinal translation of the outer tube relative to the inner tube. Rotation of the inner tube in one direction advances the mandrel into the collet, with the interacting conical surfaces driving the furcate segments of the collet outward against the inner wall of the outer tube until a tight fit is produced. Friction between the collet and tube wall locks the tubes together. Reverse rotation of the inner tube withdraws the mandrel and releases the outer tube from the grip of the collet segments. The collet is made of a resilient plastic material.

Abstract: In a control for use in a hydraulic system of the type which includes a hydraulic cylinder arranged to raise and lower a load such as a dump bed of a vehicle, wherein the hydraulic system is actuated for raising and lowering the dump bed upon axial displacement of a rod member contained within an outer conduit from a neutral position in first and second respective axial directions and wherein the hydraulic system is deactivated upon the rod member being in the neutral position. The control includes a tubular member which is adapted to be connected to the outer conduit, a control knob, and a rigid inner member partially within the tubular member having a first end connected to the rod member and a second end supporting the control knob. A latch supported by the tubular member is arranged for releasably locking the inner member in a neutral position with respect to the tubular member for precluding inadvertent axial displacement of the rod member from the neutral position.

Abstract: A bicycle speed change lever device comprises a lever body pivotally mounted on a support shaft and having a handle portion and a base portion which is formed with internal hollow spaces, within which are disposed a step positioning mechanism including a resiliently urged engaging piece and a plurality of engaging recesses arranged so as to cooperate for retaining the lever body in a selected speed gear position, and a one-way clutch mechanism including means for permitting the lever body to pivotally move in one direction with reduced frictional resistance.

Abstract: A throttle synchronizer for quickly and accurately setting and resetting each of the separate throttle valve control levers of plural internal combustion engines at a selected engine operating speed, with accurate and automatic synchronization of the engines at the selected lever setting. Adjustable throttle lever stops limit advance movement of the levers to the selected lever setting. The throttle lever stops are mounted on a transverse yoke, which is adjustable slidably relative to the paths of movement of the levers, so as to selectively locate the stops at any lever setting desired. The yoke is mounted slidably on a support located adjacent the levers, and a locking screw is utilized to secure the yoke in a selected position on the support. The throttle synchronizer is particularly useful on twin engine power boats having twin propellers, each driven by its own internal combustion engine.

Abstract: A knob assembly comprising a cup-shaped knob shell having therein a coaxial pair of oppositely wound coil springs disposed for binding engagement with a surrounding wall of a race and having respective terminal end portions engaging an encircled portion of an axially rotatable bushing which is provided with fastening means for rotatably engaging an axially inserted shaft, the springs having other terminal end portions engaged by respective oppositely rotatable lever arms mounted on the bushing and having end portions aligned with axially spaced projections of the knob shell, whereby axial movement of the shell causes the projections to pivot the lever arms in opposite angular directions to release the coil springs windingly from binding engagement with the wall of the race and permit rotation of the bushing and engaged shaft in response to rotary movement of the knob shell.

Abstract: An operating lever assembly for a bicycle derailleur has a rotor having a rotational resistance greater than the force of a return spring at the derailleur and a lever body freely rotatable, and is provided with a gap at a portion where the rotor is coupled to a lever body, within which gap the lever body is allowed to be freely rotatable, so that the lever body is, when turned or rotated against the return spring force, capable of being returned a certain extent by the force of the derailleur return spring.

Abstract: An adjustable support structure for a motor vehicle steering column. The steering column is attached to a first tube which is telescopically received within a second tube attached to the vehicle frame. A releasable wedge member acts between the two tubes to lock the steering column in any one of an infinite number of positions within a selected adjustment range.

Abstract: Disclosed is a mechanical locking device for locking a rod in a conventional hydraulic actuator, such as a hydraulic cylinder or a rotary actuator. The device comprises a radially contractible locking ring having a cylindrical inner surface for gripping the rod when the locking ring is contracted and an outer surface which is axially inclined, means for positively securing the locking ring around the rod in a position axially fixed in at least one direction with respect to the actuator housing, a ring-contracting member around the locking ring and having an inner surface which is axially inclined at the same angle as the outer surface of the locking ring for engaging that surface, and means for applying an axial force to the ring-contracting member in the direction of the inner surface axial inclination to cause the ring-contracting member to slide axially on the locking ring thereby causing the locking ring to contract and grip the rod.

Abstract: A lock-off switch comprises a lock plate rotatably disposed on a slider and having a projection at one side and a hole elongated in the lengthwise direction and a pin secured to the slider and loosely fitted in the elongated hole of the lock plate thereby to hold the lock plate rotatably. In the elongated hole of the lock plate a compression spring stretches between the pin and one end of the elongated hole, thus urging the lock plate toward a switch case. The slider has a stopper engageable with the projection of the lock plate thereby to stop the slider. An urging means, such as a compression spring, is provided at the other side of the slider and urging the projection of the lock plate into engagement with the stopper, thereby to prevent the slider from being pushed. To push the slider, the lock plate is rotated against the urging force of the urging means thereby to release the projection of the lock plate from the stopper.

Abstract: Apparatus for securely locking tractor pin drive apparatus against unintended movement transverse to the movement of the paper being fed by the device comprising a split U-shaped clamping member surrounding an elongated support means carrying the tractor and secured to the tractor body. A flat sided, threaded, bolt having a cam release and locking lever attached to one end and an adjusting self-locking means secured to the other end thereof secures the ends of the U-shaped clamp together. Movement of the lever affords quick cam release of the tractor mechanism with respect to the transverse support by engaging and disengaging the clamp from the support. Adjustment of the bolt alters the degree of clamping force between the clamp and the support.

Abstract: A fan operator lever vibration dampener for a variable pitch fan whose blade pitch is varied by movement of an elongated operating lever extending through a slot in a wall of the fan. The dampener comprises a pressure plate located between the projecting extremity of the operating lever and one of the slot side margins. The plate is movable toward and away from the lever extremity. Bias means interposed between the lever extremity and the pressure plate tend to urge the lever extremity and pressure plate against the slot margins to prevent vibration.

Abstract: A throttle control device for use with a spring-return throttle wherein a rotatable sleeve on a handlebar must be rotated to advance the throttle, the throttle control device including a clamping arrangement receivable over the rotatable sleeve to be just forward of a handgrip normally received over the sleeve, the clamping arrangement having a tab that engages conventional equipment to prevent rotation of the clamping means, and including a lever operated cam for clamping the sleeve to hold the throttle in a pre-set position, the clamping arrangement being held in position by the handgrip.

Abstract: The zero backlash spline coupling for a pair of shafts includes a first shaft having an integral flange and an internal frusto conical surface mateable with the frusto conical surface of a radially cut collar. The collar has internal spline teeth with one tooth on either side of the radial cut eliminated. The collar encircles a second shaft which has externally cut splines and abuts an internally spline-toothed keeper which also encircles the second shaft. Bolts passing through the keeper and into the flange draw the two together and force the collar to friction seat in the first shaft and lock onto the splines of the second shaft while providing a positive torque retention load on the bolts.

Abstract: A lever-operated feed device is provided, in which a rotational sleeve, having a lever handle at one end thereof, is supported within a slide block for adjustably sliding the same along a guide way of a base through a rack-pinion mechanism. A rod, which operates a clamper to fix the block upon the base at an adjusted position, is extended through the rotational sleeve in co-axial alignment therewith. A clamp handle is secured upon one end of the rod near the lever handle of the sleeve so that the rotational manipulations of the lever handle and the clamp handle can be concentrically performed from a given place.

Abstract: A shift assembly and integral handbrake apparatus particularly for bicycles is comprised of a pivotal shift lever and a pivotal handbrake lever. Both levers are carried on a handbrake housing. A Bowden cable is coupled to the shift lever. Friction means places a preset and controlled drag on the shift lever. Pivoting the shift lever provides the mechanical advantage necessary to overcome the drag placed thereon thereby to effect a relative lengthening or shortening of the Bowden cable. The shift lever and handbrake lever are positioned on the housing in such manner as to allow nearly simultaneous grip of both levers.

Abstract: An adjustable stirrup type motorcycle gear shifter allows the cyclist to slip his shoe into shifting position, either sidewardly or lengthwise, for safe retention during up and down gear shifting.

Abstract: A multiposition rotary switch including a detent mechanism wherein a cam on the rotor acting through an arm resiliently deforms a portion of a side of the housing. A contactor constrained to rotate with the rotor wipably engages a plurality of contacts carried on a base in seriatim, each contact being defined by a portion of a conductor. The contacts can be arranged on the base to provide a variety of switching functions. An insulating material is adherently deposited on a predetermined location of at least one of the conductors carried by the base to provide a coded output. An annular bearing having a relatively large bearing area rotatably supports the rotor.

Abstract: A positioning mechanism for moving a window of an automotive vehicle or adjusting the seat thereof has a pinion rotatable on a support by means of an adjustment knob and having two axially spaced arrays of gear teeth. The teeth of one of these arrays is angularly offset relative to the teeth of the other array. A lever connected to the load being moved is pivotal on the support and formed with two axially spaced racks each of which meshes with a respective one of the arrays of the pinion. The lever may be formed with a pair of axially joined plates each formed with a respective one of the racks and the pinion may have a radially outwardly extending flange projecting between these plates to insure that each rack remains in mesh with the respective array of teeth on the pinion. In addition a brake may be provided for resisting rotation of the pinion by the lever and for allowing rotation of the pinion by the shaft carrying this pinion.

Abstract: A positive cam lock for a pair of telescoping extension poles. The cam support is mounted to the inner pole and carries a coaxially rotatably mounted idler cam and an eccentrically rotatably mounted locking cam. The outer pole has a number of inwardly extending splines which engage corresponding grooves on the locking and idler cams. When the outer pole is rotated, the eccentric cam will rotate and lock the outer pole at a desired axial position with respect to the inner pole while the idler cam prevents misalignment. A key mounted to the locking cam rides in a keyway on the cam support for preventing over-rotation of the locking cam.

Abstract: An adjustable vehicular steering column utilizing telescopic support members, which are not coaxial with respect to the steering column, permitting infinite adjustment between predetermined limits. A releasably engageable locking mechanism is provided to apply a clamping force on the telescopic support members when the steering wheel is properly positioned by the vehicle operator. An auxiliary locking mechanism is provided as a safeguard in case the main locking mechanism fails.

Abstract: The device comprises on the front end portion of the plunger or piston a retaining ring mounted in the barrel with the interpositioning of a joint in such a way that the bore of the ring is slightly off-center relative to the piston axis when the joint is not deformed.

Abstract: A manual mechanism for resetting a rotatable member to its initial position is disclosed which provides for rotation of 360.degree. or more, rotates in one direction only, and can be simply locked and unlocked for periodic use. In one embodiment the resetting mechanism is applied to cumulative demand registers on watt hour meters.

Abstract: A seat recliner including seat back and cushion supports connected about a pivotal axis and positioned relative to each other against pivoting in an infinite position adjustable manner. A housing is fixed to one of the supports and defines a pair of locking surfaces extending about the pivotal axis on opposite sides thereof with curved shapes that have increasing radii from the axis in opposite directions. A pair of cam members pivotal on the housing about the axis have respective cam surfaces that oppose the locking surfaces of the housing from opposite sides of the pivotal axis with curved shapes that have increasing radii in the same direction as their associated locking surfaces. A pair of locking slides are slidably mounted on the other support in a pivotally fixed relationship.

Abstract: A rotary-type control for a headphone earpiece has an indexing dial which is loosely keyed to the control shaft of a potentiometer and extends partially through an opening in the cover of the earpiece to permit the wearer of the earpiece to manually control the potentiometer. The loosely keyed indexing dial is centered in the opening in the cover of the earpiece by the cooperative action of a journal bearing on the underside of the cover, a raised hub-like projection on the top of the indexing dial which is received and journaled in the bearing and a spring which exerts an upward force on the bottom of the dial keeping the hub-like projection journaled in the bearing so that the dial is level and centered in the opening in the cover.

Abstract: A throttle control device for use with a rotating throttle control member of a type being biased to an idle position such as commonly used on motorcycles. A pair of elongated members having arcuate surfaces thereon adapted to contact the throttle control member are pivotally connected together at one of the ends thereof and an O-ring structure is provided for biasing the opposite ends of the elongated members together, thereby causing the elongated members to be in frictional engagement with the control member. Because of this structure, the throttle control device of this invention in cooperation with a brake lever or other projection can be used to maintain the throttle control member at any desired setting, but allows the person in control of the throttle control device to selectively and instantaneously overcome the frictional engagement of the throttle control device with respect to the throttle control member to turn the throttle back to an idle position when necessary.

Abstract: A device for allowing the transmission of motion from an input arm to an output means and preventing the transmission of motion from the output means to the input arm. A lockable cam acting on an arcuate surface acts to lock the device while components of the input arm may act to disengage the lockable cam from engagement with the arcuate surface.

Abstract: Apparatus is provided for adjustable mounting a steering column in a vehicle, whereby the column may be telescoped, tilted or both, simultaneously, by unlocking the mechanism with a single handle. The mechanism includes a pair of side frames fixed within the vehicle, and an inner tube fixed to the column and movable between the side frames. When the handle is turned to lock the mechanism, the clamping portion of the mechanism draws the slide adjusters toward the inner tube, forcing the generally heart-shaped slides toward the inner tube and biasing them away from the longitudinal axis of the mechanism. This movement of the slides forces the pin connecting each opposite pair of slides into engagement with both the front frictional surface of the inner tube and with the outer surface of the slot within which the particular pin travels, thereby trapping and frictionally holding the inner tube relative to the side frames.

Abstract: In a fastening device for a tiltable steering wheel assembly, the locking lever of the device is set in the locked position beyond the rotary dead point of a rotary cam element pivoted on a fastening bolt so as to firmly hold the steering column tube assembly at a desired angle with respect to the driver. The locking lever is positioned substantially parallel with respect to the steering column tube assembly in the locked position to prevent unexpected release of the locking lever by the driver's legs.

Abstract: An electrical switch has a housing with means operable generally therein for switching power through the switch. Means is rotatable in the housing between a plurality of indexed positions for actuating the switching means, and means is provided for releasably holding the actuating means in each of its indexed positions. Means is also provided for retarding the rotation of the actuating means between at least some of its indexed positions.A method of operating an electrical switch, and an indexing system for an electrical switch are also disclosed.

Abstract: A vehicle parking brake pedal positioning mechanism of the disclosure positions a parking brake pedal in an actuated condition against pivotal movement toward a released position by an infinite position locking action. A frame of the mechanism rotatably supports the brake pedal and a locking member about a common pivotal axis so as to be rotatable with respect to the frame and each other. The frame and the locking member respectively include first and second cam surfaces extending about the pivotal axis and having portions with increasing radii from the axis in a direction corresponding to the brake pedal movement from the released position to the actuated condition.

Abstract: A brake lock knob assembly comprising a bushing disposed to bindingly engage an axially inserted shaft end portion and having a first frictional brake surface disposed in releasable resilient engagement with a second frictional brake surface of an adjacent nonrotatable member, and an axially movable knob shell having an inwardly projecting portion disposed to disengage the brake surfaces and having interlocking means for rotatably engaging the bushing.

Abstract: A throttle control linkage adapted for connection to the governor mechanism of an engine preferably comprises a slotted quadrant slidably mounted on a pin attached to a support member. The quadrant is held in a selected position on the support member by a frictional device comprising at least one elastomeric member compressed against a side of the quadrant by spring means, preferably in the form of a pair of back-to-back Belleville washers.

Abstract: The knob comprises a body which cannot turn the control shaft unless the body is first pushed in. A brake prevents turning of the knob body when the body is in normal condition. Upon pushing the body rearwardly, the brake is disengaged to allow turning of the knob. Upon releasing the body, spring means projects the body forwardly back to normal condition in which the brake prevents the body from turning. Spring pressed balls allow the body to turn without turning the control shaft upon exerting excessive torque on the body to thereby prevent damage to the controls. Means is provided to limit turning of the control shaft to a predetermined angle.

Abstract: An anti-rattling device which also preloads the actuated device and includes a link supporting and guiding the actuated device, with the anti-rattling mechanism including a resilient roller positioned to engage a cam surface on the link, the cam surface being eccentric to a pivot point for the link.

Abstract: The printer records images in the form of dots on electrical discharge-sensitive paper. Three groups of five styli are mounted on a rotor. The paper is in strip form and is fed continuously through a curved guide in a direction perpendicular to the plane of rotation of the rotor, so that the paper is wrapped part way around the rotor as it moves past. Characters are formed from a five dot by seven dot matrix. This invention provides means for automatically retracting the styli away from the paper when the rotational speed of the rotor drops below a pre-determined minimum level and, of course, when the rotor stops. This facilitates removal of the rotor from the printer, and also facilitates feeding a new strip of paper into the printer. Means also are provided for adjusting the axial position of each group of styli merely by turning one or more screws. The screws are easily accessible without removing the rotor.

Abstract: A locking device adapted to lock a driven member automatically against the force which applies thereon comprising a locking plate which has an arbitrary length and locking flanks on both sides thereof; a locking member which has contact members with which locking flanks of the locking plate contact and pins; a drive plate which has contact sides, formed at about right angles to the longitudinal axis of the locking plate, with which the pins are in contact and a drive member thereon; and an operating plate which has a first sliding flank approximately paralleled to the longitudinal axis of the locking plate, along which one of pins of the locking member slides and a second sliding flank inclined to the first sliding flank along which another pin of the locking member slides. The contact members are generally pressed against the locking flanks of the locking plate by a suitable resilient.

Abstract: The power train of a crawler tractor comprises a hydraulically operated modulating main clutch (operated by a clutch control valve) for transmitting motive power from the tractor engine to a hydraulically operated reversible multi-speed range power shift transmission (operated by a shift selector valve) for varying the speed at the output shaft of the transmission. A control lever assembly at the tractor operator's station comprises a manually operable gear selector lever and a manually operable safety lever. The gear selector lever is pivotally mounted on an oscillatable shaft and movable laterally in opposite directions from a centered neutral position to rotate the oscillatable shaft and thereby operate the shift selector valve (connected to the oscillatable shaft) and shift the transmission to either first or second speed ranges in either forward or reverse direction.

Abstract: The linear motion arresting device has a stationary member with an internal bore. A mating piston, formed of a plurality of piston parts, is slidable in said bore. One piston part is connected to a prime mover and the others are slidable toward and away from, and lengthwise of, said one piston part. Each of the piston parts has an elongated groove extending parallel to the bore and with the grooves providing directly between piston parts, a ball receiving channel in which a ball may travel and with the channel extending axially of, and at an angle to, the bore and with portions of the two opposite ends of the grooves extending more radially inwardly of the bore than the other two. A relatively nondeformable ball is mounted for travel in the ball receiving channel. A spring construction moves the piston parts in opposite, axial directions until the more radially inward portions of said grooves contact said ball.

Abstract: A derailleur for a bicycle, which comprises four members, including a fitting member, two linkage members and a movable member, all movable with respect to each other. Between two of the members there is a device for positioning cages having chain-guide pulleys mounted on the movable member, whereby the derailleur enables the cages to be properly positioned and kept in the position at each speed-change stage of the bicycle so that an accurate and light speed-change operation may be performed.