Abstract: The invention relates to a scroll-type compressor which will not exert an undesirable influence on a power source of a rotation shaft, even if seizing occurs between an orbiting scroll member and a fixed scroll member. A power transmission mechanism P is provided between a rotation shaft 7 and an eccentric drive pin 25 for transmitting power to an orbiting scroll member 14. An inner wall of a bore of a closed ended cylindrical member 40 with an eccentric drive pin 25 protruding from a base end thereof is formed in the height direction of the cylinder with a plurality of grooves 44 of semi-circular cross-section. Moreover, a cylindrical resilient roller 43 is centrally provided on the closed end with a height approximately the same as that of the closed ended cylindrical member 40. Rollers 42 are provided so as to be inscribed in each groove 44 and so as to come into contact with an outer peripheral surface of the resilient roller 43.

Abstract: A cam assembly for a hoist mechanism includes a cam member, a pair of springs and an input shaft. The cam member has a cavity defined by an inner periphery of a side wall and floor. Cutout portions extend radially outwardly from the inner periphery of the cavity. The springs include a bow-shaped body portion positioned between first and second connection end members. The body portion further includes an outwardly extending detent, each detent extends into a cutout of the cam member to operatively connect the cam member to the springs. The input shaft has a through hole. The first connection end members of each spring are inserted into the through holes of the input shaft, thereby operatively connecting the springs to the input shaft with a reduced number of components.

Abstract: A scroll compressor having a compressor housing and an orbiting scroll member is provided with an annular plate between the housing and orbiting scroll member. The plate having an axial aperture provided therethrough, the plate abutting one of said housing and said orbiting scroll member. A pin projects through the aperture of the plate and is engaged with the member abutting the plate. A projection is provided on the pin for preventing axial displacement of said pin relative to said plate axially away from the abutting member.

Abstract: A rotating sign assembly has a plurality of rotatable, multi-sided, sign segments, a torque transmitting member which is rotatable about a first axis of rotation, a mechanism for rotatably driving the torque transmitting member, and a torque limiter. The torque limiter includes a pair of engagement members, one of which is fitted on the torque transmitting member so that it rotates with the torque transmitting member about the first axis of rotation. This first engagement member has a first engagement surface. The second engagement member operates to rotate one of the multi-sided sign segments and is supported for rotation about the first axis of rotation. This engagement member has a second engagement surface which is configured to abut the first engagement surface on the first engagement member. The torque limiter also includes a coupling which includes a projection on one of the engagement surfaces and a recess defined in the other engagement surface.

Abstract: A torque limiter driving head for paint cans with a stirrer is arranged in a storage cabinet for the paint cans. A number of rotatably driven pulleys and a matching number of stirring shafts are provided. The pulleys have a hub and the stirring shafts are inserted into the hubs. The hubs have elastic, radially inwardly projecting tabs. The stirring shafts have a non-circular portion engaged by the elastic, radially inwardly projecting tabs. The stirring shafts comprise a transverse pin-and-blade arrangement for driving stirrers of the paint cans.

Abstract: A torque limiting ratchet mechanism disposed within a crank handle. The ratcheting mechanism includes a ratchet disk having inner projecting portions which engage a shaft for rotational purposes, and resilient outwardly projecting portions which are engagable in indentations formed in an inner surface of the ratchet handle. The torque limiting ratchet mechanism of the present invention is particularly utilized in a bicycle mounted exercise trainer. In this utilization, one cone of the mounting system is laterally fixed and the other cone, which is engaged to the torque limiting ratchet is laterally movable to clamp the axle of the rear wheel. Due to the large variation in bicycle rear wheel axle geometries, the roller portion of the wheel resistance mechanism is made longer to accommodate the single-sided movement of the mounting cones of the trainer.

Abstract: A coupler for coupling shafts has an inside coupling having an outer periphery and a center opening with a longitudinal axis which is adapted to receive the end of a driving shaft. An outside coupling has a center opening with an inner periphery, and is rotatably fitted over the outer periphery of the inside coupling. A plurality of arcuate notches are located in the outer periphery of the inner coupling and the inner periphery of the outer coupling and are adapted to register with each other in mating relationship wherein the mating notches present collectively a circular roller surface. A plurality of cylindrical rollers are rotatably mounted in the notches of the inside and outside coupling and serve to operatively join the inside and outside coupling for rotation together. The notches in the inside coupling have an arcuate portion capable of receiving the rollers in a nesting position without the rollers penetrating the notches in the outside coupling.

Abstract: In a torque-switched clutch between an input shaft and an output shaft, the clutch transferring into a release position from a positive-locking connection when a limiting torque is reached, at least one positive-locking element is connected to one of the shafts. The positive-locking element interacts with a positive-locking receiver of the other shaft. The positive-locking element is movable against a force out of a coupling position into a release position in a non-destructive manner. The positive-locking element is of latch type design and is mounted on the one shaft so as to be pivotable relative to that shaft for movement between a latch locking position and a latch overrun position.

Abstract: A torque limiting system for limiting the torque transferred between a rotating member and another member in which a disc is disposed within the rotating member and a shaft is coupled to the disc for receiving a load. At least one bearing member is disposed in the disc and is urged in a radial direction into engagement with the rotating member to normally couple the rotating member to the shaft to drive the shaft. The bearing member responds to loads on the shaft exceeding a predetermined value for releasing the engagement with the rotating member and decoupling the rotating member from the shaft.

Abstract: A drive collet assembly for an internal thread producing tap. The collet includes a collar that is attached to the stem of the tap using set screws. The collar is received into a recess of the body portion of a drive collet and retained therein using a spring clip. A smaller diameter aperture extends into the body portion above the recess, the aperture receiving a portion of the stem of the tap, the portion has a pair of opposed flats thereon. At least two laterally extending threaded apertures intersect the smaller diameter aperture and each receive a rigid button, a flexible element and a set screw. The set screw can be adjusted to provide a desired breakaway torque which will protect the tap from breakage should an over-torque condition occur. The flexible element will allow the rigid buttons to be forced outwardly so that the drive collet assembly spins freely about the jammed tap, rather than twisting it off.

Abstract: In a one-way clutch used in a starter for engines, a locking concave for locking a roller thereto is formed on a roller-moving surface of one clutch member having a peripheral surface facing a peripheral surface of the other clutch member having a wedge-shaped groove for accommodating the roller. A resilient member for disengaging the roller from the locking concave at the time of overrunning is accommodated in an annular groove, thus urging the roller radially outwardly. The roller is prevented from colliding with the locking concave at the time of overrunning so that vibrations and noise are not generated.

Abstract: A headrest device includes a stay fixed to a seat back, a headrest body supported on the stay so as to be able to rotate around the stay, and a resistance adding member for increasing the resistance to the rotation of the headrest body relative to the stay, the member includes a plurality of projections provided on the stay, and a plurality of concave portions provided on the headrest body so as to be able to be elastically deformed whereby each of the projections is in frictional engagement with each of the concave portions.

Abstract: A transmission device has holding slots provided in a boss portion thereof for holding engaging elements. A drive shaft has engaging recesses provided in an outer surface thereof for accepting partially the engaging elements to engage the transmission device with the drive shaft. The engaging elements remain urged against the engaging recesses of the drive shaft by a resilient member which is disposed radially of a boss portion of the transmission device for maintaining the engagement of the transmission device with the drive shaft. When the transmission device is overloaded, the engaging elements depart from the engaging recesses in the drive shaft, against the urging force of the resilient member, to cancel the transmission of torque from the drive shaft to the transmission device.

Abstract: A torque limiting coupling (1) has a coupling sleeve (5), a coupling hub (2), and driving elements (12) settable between a torque transmitting position and a disconnected position. A switching ring (27) and loading balls (24) are provided which, in the torque transmitting position, load the driving elements (12) radially inwardly. If the driving elements (12) give way in their disconnected position, the balls (24) are pushed radially inwardly until the switching ring (27) is able to slide over the balls (24) and prevent them, via a bore portion, from displacing radially outwardly. This ensures that, if the coupling hub and coupling sleeve continue to rotate relative to one another, the driving elements (12) cannot re-engage the recesses and thus assume the torque transmitting position.

Abstract: A transmission and torque-limiting joint able to disengage the driven member from the driving member upon exceeding a maximum value of the transmitted torque and to allow re-engagement at a lesser value of the relative velocity, with cooperating recesses (5) and sliders (20); the sliders (20) are wedge-shaped so as to cooperate with pairs of shaped pads (10) urged towards one another by springs (12).

Abstract: A torque limiter adapted to be automatically reset after a long period of time. The inner ring (1) has a cylindrical surface (5). A polygonal engaging surface (9) is formed on the outer ring (2) by a leaf spring in the shape of a polygonal ring. A cage (11) having pockets is provided between the inner and outer rings (1, 2). Rollers (13) received in the pockets are adapted to engage the cylindrical surface (5) and the engaging surface (9) at the narrowest portions. The inner ring (1) has an eccentric surface (15) on which is supported a bearing (16) which holds the cage (11) in a diametrically offset position. An annular portion (20) of the cage (11) is brought into contact with an annular portion (19) of the outer ring (2). As the torque increases with the rollers (13) engaged, the leaf spring (8) is deformed and the rollers (13) pass through the engaging positions, so that the clutch is disengaged.

Abstract: A torque wrench has a non-jarring design such that it resets without jarring the output shaft after it delivers the preset maximum torque, it accommodates interchangeable output shafts so that a variety of different drive tips may be employed with the same handle, and it has a variable limiting torque value because it can accommodate interchangeable output shafts having uniquely designed cam surfaces.

Abstract: The clutch is an integral gear stage in a subfractional horsepower motor gear train that is used in an appliance such as an icemaker or cam-operated timer. The clutch has an inner member with arc-shaped springs that carry curved protrusions and an outer member with sinusoidally shaped contours. The curved protrusions engage the sinusoidally shaped contours to permit the clutch to transmit torque to an appliance component. When the torque applied to the clutch exceeds a predetermined level, the curved protrusions disengage from the contours and permit the inner member to rotate independently from the outer member. The curved protrusions disengage from the sinusoidally shaped contours and then reengage the sinusoidally shaped contours causing the arc-shaped springs to compress and extend as a function of the sinusoidally shaped contours, gradually compressing and gradually extending, thereby reducing vibration and noise.

Abstract: Methods and apparatus are provided for a torque driver including a laterally displaceable gear support member to carry an output spur gear. A biasing assembly biases the output spur gear into engagement with a pinion to which is applied an input torque greater than a desired output torque limit for a threaded fastener such as a nut or screw. A coiled output linkage connects the output spur gear with a fastener adaptor which may be a socket for a nut. A gear tooth profile provides a separation force that overcomes the bias to limit torque at the desired torque limit. Multiple fasteners may be rotated simultaneously to a desired torque limit if additional output spur gears are provided. A gauged selector mechanism is provided to laterally displace multiple driver members for fasteners arranged in differing configurations. The torque limit is selectably adjustable and may be different for fasteners within the same fastener configuration.

Abstract: An electric toothbrush includes a handle section having a motor drive and a drive shaft coupled to the motor drive by a translating device, and a brush section having bristle assembly and a transmission shaft unit coupled to the drive shaft and driven by it to turn the bristle assembly back and forth alternatively, the transmission shaft unit consisting of a driving member, a connecting member, a driven member, and a compression spring, wherein the transmission shaft unit disengages from the drive shaft upon an overpressure to prevent damage to the bristles.

Abstract: The present invention relates to a limit-torque coupling mechanism with delay restoring function. When the relative coupling portion is forced by torque to reverse the limit-torque coupling mechanism, a delay in the restoring function to reduce noise and frictional loss arising from subsequent relative sliding is accomplished so as to restore coupling during the decrease in torque difference or speed difference. To accomplish the aforesaid function lie in that, the design of the torque coupling mechanism being forcibly reversed includes a return motion damper to produce mechanical friction damping, fluid damping or magnetic damping.

Abstract: A torque limiting clutch which transmits gradually increasing torque up to a prescribed limit at which limit the clutch disengages from its load. An embodiment designed for light service use in dentistry encloses all the working parts in a housing through which torque is applied to the load, and is autoclavable. This embodiment can be attached to known dental handpieces for assembling components of dental restorations with prescribed limited torque.

Abstract: The present invention relates to a limit-torque coupling mechanism with delay restoring function. When the relative coupling portion is forced by torque to reverse the limit-torque coupling mechanism, a delay in the restoring function to reduce noise and frictional loss arising from subsequent relative sliding is accomplished so as to restore coupling during the decrease in torque difference or speed difference. To accomplish the aforesaid function lie in that, the design of the torque coupling mechanism being forcibly reversed includes a return motion damper to produce mechanical friction damping, fluid damping or magnetic damping.

Abstract: A torque limiting clutch which transmits gradually increasing torque up to a prescribed limit at which limit the clutch disengages from its load. An embodiment designed for light service use in dentistry encloses all the working parts in a housing through which torque is applied to the load, and is autoclavable. This embodiment can be attached to known dental headpieces for assembling components of dental restorations with prescribed limited torque.

Abstract: A torque limiting coupling (5) has a plurality of slide-like driving members (19) circumferentially and movably distributed in a coupling hub (10). The unit is rotatably accommodated in a coupling sleeve (7). The driving members (19), with their torque transmitting faces (25) at their heads, are pushed by a spring assembly (38, 39) and switching cams (32) into correspondingly designed recesses (22) of the coupling sleeve (7). The pressure springs (38, 39) and the switching faces (30, 31) of the driving members (19) as well as the torque transmitting face (25) are arranged so as to extend in the same direction. Thus, the springs (38, 39), during the transmission of torque by the coupling sleeve (7), subject the driving members (19) to a moment which acts against the tilting moment resulting from the transmission of torque. This results in an improved wear and switching behavior.

Abstract: A film spool comprises a spool core provided with a coaxial opening adapted to receive a rotational driver rotatable alternatively in film winding and unwinding directions to similarly rotate the spool core. The spool core includes first and second torque transmission devices. The first torque transmission devices projects into the core opening to be located in the way of the rotational driver, when the driver is rotated inside the core opening in the film unwinding direction, for making the driver rotate the spool core in the film unwinding direction responsive to the driver applying an unwinding turning force to the first torque transmission devices, and is capable of being deformed out of the way of the driver, when the unwinding turning force the driver applies to the first torque transmission devices exceeds a maximum force greater than required to rotate the spool core in the film unwinding direction, for allowing the driver to freely rotate inside the core opening in the film unwinding direction.

Abstract: A coupling between a direct drive valve and a rotary valve for providing a rotary-to-rotary coupling therebetween. A shaft carried by the rotor of the motor defines a re-entrant bore having a plurality of flat surfaces. A rod having a plurality of flat faces on the exterior surface thereof and which is connected to the rotary valve is received in mating engagement with the bore. The shaft is slotted to provide a plurality of flexible fingers for receiving the rod.

Abstract: A device for limiting the torque transmitted from a drive shaft to a driven shaft comprising a first body having a cylindrical portion and being adapted for rotation with one shaft and a second body having a cylindrical portion and being adapted for rotating the other shaft. The cylindrical portion of one body is mounted within the cylindrical portion of the other body for relative rotation with respect thereto about an axis which is eccentric to the axis of rotation of the one body. A pin carried by the cylindrical portion of the other body for radial movement with respect thereto has inner and outer ends, with the inner end held engaged with the cylindrical portion of the one body by a C-ring to allow the drive shaft to rotate the driven shaft until the torque transmitted between them overcomes the C-ring to allow the cylindrical portions of the bodies to rotate relatively to one another.

Abstract: A clutch for a tire lift/carrier winch includes a drive plate and a driven plate having a plurality of elongate springs thereon. The driven plate includes circumferentially spaced driven end portions which are positioned in driving engagement with circumferentially spaced drive portions of the drive plate to permit rotation of the driven plate upon rotation of the drive plate when the load on the cable winding spool is within a prescribed limit. However, when the load on the cable winding spool exceeds the prescribed limit, the elongate springs on the driven plate function as cantilevered spring segments deflectable about respective fulcrums in such a manner as to prevent rotation of the driven plate upon rotation of the drive plate.

Abstract: A clutch for a tire lift/carrier winch includes a drive plate and a driven plate having a plurality of elongate springs thereon. The driven plate includes circumferentially spaced driven end portions which are positioned in driving engagement with circumferentially spaced drive portions of the drive plate to permit rotation of the driven plate upon rotation of the drive plate when the load on the cable winding spool is within a prescribed limit. However, when the load on the cable winding spool exceeds the prescribed limit, the elongate springs on the driven plate function as cantilevered spring segments deflectable about respective fulcrums in such a manner as to prevent rotation of the driven plate upon rotation of the drive plate.

Abstract: A torque limiter suitable for use in a gear train is provided having at least one gear connected with a first driven member and another gear being connected with a motive source for transmitting torque from the motive source to the first driven member. One of the gears has an inner hub and an outer ring with spring means preventing relative motion between the hub and the ring unless a predetermined torque value is exceeded whereby the hub has angular rotation with respect to the ring.

Abstract: A tape dispenser comprises a housing, a reel core (3) rotatable in the housing about an axis and having an inner periphery formed with an annular array of inwardly directed core teeth (17), and a drive wheel rotatable in the housing about the axis. A plurality of elastically deformable spring tongues (15) formed unitarily with each other each extend at an angle to the axis from the respective inner end fixed to the drive wheel to a respective outer end lying within the reel core adjacent the inner periphery thereof. Each inner end is axially offset and radially inwardly offset from the respective outer end and each outer end is integrally formed with at least one tongue tooth engaging between the core teeth. A supply of tape (14) is wound on the reel core such that when the tape is payed out or wound up on the reel core same rotates relative to the drive wheel and the core teeth move angularly relative to the tongue teeth with elastic inward deflection of same.

Abstract: A circuit breaker drawout arrangement includes a drive mechanism for moving a circuit breaker along a pair of rails between a Connect and a Disconnect position by means of a drive tool. A torque limited clutch permits a lower maximum torque when moving the breaker to the Connect position and a greater maximum torque when moving from the Connect position to the Disconnect position. In one embodiment the clutch is formed by a pair of oppositely orientated unidirectional roller clutches in the drive nut and in another by a ball and detent arrangement in the drive nut.

Abstract: A torque-limiting clutch brake having an inner collar which splines to a transmission gearbox input shaft and including a pair of depressions along its outer edge. A torque-limiting intermediate coupling detent member and spacer ring are disposed around the inner collar. Two resilient detents from the coupling member retainingly engage the depressions of the inner collar within a predetermined limit of torque. Two covers, each having a friction facing on their outer surfaces, house the inner collar, coupling member, and spacer ring, and positively engage the coupling member. An assembly clamp ring fits around the two housing covers and secures the assembly together. The inner collar, coupling member, spacer ring, housing covers, and assembly clamp ring each are made up of two separable semi-circular sections to facilitate removal and installation of the clutch brake without lowering and disassembling the vehicle transmission.

Abstract: A clutch assembly for preventing overloading in drive lines in machinery. The assembly includes first and second clutch sleeves having first and second sets of recesses respectively. A clutch hub engages the sleeves with a plurality of spring loaded drive members for releasably engaging recesses in the clutch sleeve. One set of the recesses having equal torques in both forward and reverse direction. The second set of recesses are shaped to transmit more torque in the reverse direciton than in a forward direction.

Abstract: The invention relates to a shut-off valve comprising a valve housing (12), a valve piston with valve cone (22) arranged up-stream of an associated valve seat (20), and a piston holder (16) axially movable within the valve housing (14) by means of a spindle (58) and accommodating said valve piston. To prevent overtightening of the valve piston, the piston holder (16) is connected to the valve housing (14) in the manner of a slip clutch. In addition, the outlet port (146) of the shut-off valve can be closed by a non-return valve.

Abstract: A delivery system for attaching and detaching an ultrasonic surgical blade/coupler and an acoustical mount. An adaptor sleeve receives and encapsulates the blade to avoid accidents resulting from the sharp blade edge. A cylindrical member receives the sleeve and a ratcheting mechanism is provided between the adaptor and member to facilitate rotation of the adaptor and coupler upon rotation of the member up to a predetermined torque, ensuring threaded connection between the coupler and acoustical mount sufficient for transmission of ultrasonic energy. To remove the blade/coupler, the member is rotated in the opposite direction, whereby unlimited torque may be applied through the ratchet mechanism to unthread the coupler from the mount.

Abstract: A delivery system for attaching and detaching an ultrasonic surgical blade/coupler and an acoustical mount. An adaptor sleeve receives and encapsulates the blade to avoid accidents resulting from the sharp edge of the blade. In a two-piece embodiment hereof, a cylindrical member receives the sleeve and a ratcheting mechanism is provided between the adaptor and member to facilitate rotation of the adaptor and coupler upon rotation of the member up to a predetermined torque, ensuring threaded connection between the coupler and acoustical mount sufficient for transmission of ultrasonic energy. To remove the blade/coupler, the member is rotated in the opposite direction, whereby unlimited torque may be applied through the ratchet mechanism to unthread the coupler from the mount.

Abstract: A clutch for a tire lift/carrier winch includes a drive plate and a driven plate having a plurality of elongate springs thereon. The driven plate includes circumferentially spaced driven end portions which are positioned in driving engagement with circumferentially spaced drive portions of the drive plate to permit rotation of the driven plate upon rotation of the drive plate when the load on the cable winding spool is within a prescribed limit. However, when the load on the cable winding spool exceeds the prescribed limit, the elongate springs on the driven plate function as cantilevered spring segments deflectable about respective fulcrums in such a manner as to prevent rotation of the driven plate upon rotation of the drive plate.

Abstract: Clutch apparatus with a rotary inner member having a plurality of equally spaced indents. An outer member has a plurality of equally spaced flexible beam members on its inner peripheral surface, each of said members being adapted to engage one of said plurality of indents. When either the inner or outer member is subject to an overload condition, said beam members flex radially outward and slip from one indent to another.

Abstract: A deployable boom is constructed of springly flexible members so that it is self-biased toward a long length deployed state. A drive mechanism is operative to actuate a reel and lanyard device to retract the boom to a short length storage state and to controllably permit the boom to be extended to its long length deployed state. Latches are operated by the drive mechanism to releasably hold the boom in the short length storage state.

Abstract: Clutch apparatus having a rotary inner member with axially extending flexible members that engage complimentary cavities in an outer rotary member. When a predetermined value of torque is exceeded, the flexible members slip in the cavities of the outer member.

Abstract: A flight section for mounting at the feed end of an auger comprises an intergral moulding from a resilient elastomeric material such as natural rubber which includes a central sleeve portion and an outer flight. The sleeve has an inner surface for engaging around a shaft with the surface defining a part cylindrical portion and a flat portion by which torque is communicate from the shaft to the sleeve portion while allowing slippage to occur by distortion of the resilient sleeve portion when the torque exceeds a predetermined maximum. The flight extends over 360.degree. and is shaped so that it increases in transverse width or thickness as it approaches the outer edge thereof thus defining a flat band around the outer edge. This acts to define a curved surface facing the material to be fed which cups the material and reduces slippage.

Abstract: A housing having a telescopingly extendible and retractable leg is carried by the frame of a motorcycle. A camming mechanism which drives the leg is secured to a reversible motor through a limited torque coupling whereby the extension of the leg is automatically terminated upon firm contact with the ground. Switching circuitry provides that the motor is manually actuated by the operator of the vehicle.

Abstract: An overload coupling for the protection of drive trains on machines, particularly agricultural machines powered by a tractor, protects against overloading in at least one rotational direction. A coupling sleeve is mounted for rotation around a coupling hub of the overload coupling. Relative rotation between the hub and sleeve is about a coupling axis. A plurality of circumferentially spaced recesses are provided in the coupling hub which each contain a rotatably mounted rotor. The rotors are mounted about their own rotor axes which are parallel to but spaced apart from the coupling axis. Each rotor contains a radially movable driver cam which is spring-loaded and has cam surfaces for engaging detent grooves in the sleeve. With the driver cams engaged in the detent grooves, relative rotation between the hub and sleeve is resisted. By shaping the cam surfaces and adjacent abutment surfaces of the driver cams, the direction and force of disengagement can be set between the coupling hub and coupling sleeve.

Abstract: A radial ball torque limiter having a member with an annular wall defining a cavity with a plurality of rows of internal teeth extending circumferentially along the interior of the annular wall, an input shaft extending into the cavity, and one or more caged ball assemblies surrounding the input shaft with each having a circumferential row of balls loosely held by a generally annular cage to engage in ball-receiving recesses between adjacent teeth and the cage has a hub connected to the input shaft. A circular member positioned radially inward of the balls engages and yieldably holds the ball in the ball-receiving recesses during torque transmission from the input shaft to an output shaft and is yieldable upon the application of excessive torque to permit the balls to move inwardly and travel past the teeth to limit the value of the torque that is transmitted.

Abstract: A clutch mechanism for use in the drive mechanism for a vacuum cleaner floor cleaning rotary brush is provided which prevents damage to the drive belt in the event the brush becomes jammed and is prevented from rotating. A cam ring having external bumps carried on resilient beams is nested inside a driven sprocket with the bumps positioned in valleys between ridges formed on the interior of the sprocket. A pair of end caps sandwich the assembly of the cam and sprocket. The cam is keyed to the rotary brush and thus when the brush becomes jammed, the sprocket will continue to rotate, and the torque applied between the sprocket and cam will cause the ridges to push radially inwardly against the bumps and beams of the cam permitting the bumps to pass over the ridges dissipating the energy of the rotating sprocket.

Abstract: A torque limiter having a locking stud which radially slides in a drive part enters an associated slot in the inner periphery of a driven part coaxial with the drive part under the action of a radial-thrust blade spring. When an excessive torque is present between the drive and driven parts, the stud tends to leave its housing to disengage the drive and driven parts and thereby it laterally and outwardly clears intermediate rollers in order to decrease the distance between the spring and the stud and so that the force applied by the spring shall not increase during such unlocking.Thus the unlocking is immediate and the oscillatory zone of the prior-art limiters is virtually eliminated.

Abstract: A bi-directional advance gear having a torque limiting radial friction clutch is disclosed. The friction clutch comprises an annular member having an inner and outer periphery and having gear teeth defined by its outer periphery and radially inwardly projecting teeth on its inner periphery. A flat web substantially closes one face of the annular member to provide a shallow recess bounded by the projecting teeth and defines an opening concentric to the annular member. An inner member having a hub portion is rotatably mounted in the opening and has a pinion gear at one end. The other end of the hub has a plurality of radially extending rosette-shaped springs contained in the recess. Each spring has a pair of radially extending leg portions joined by an arcuate portion. Each arcuate portion has a lobe biased into engagement with the inwardly projecting teeth.

Abstract: A coupling device is disclosed which is in rotation between a motor member and a receiver member. The device has a ratchet ring, a pawl holder ring and a drive ring. The pawl holder ring has stops and pawls with a shoulder and a stop surface and pivots between an engaged position and a disengaged position. The drive ring has drivers engaged in the stops. A contoured cam on the drive ring bears on the pawl shoulder in order to pivot it towards its engaged position. Elastic biasing means are positioned between the driver and one of the stops. The coupling device is adapted for use in the control of control rods in a nuclear reactor.