Abstract: A garage door operator for moving a garage door between open and closed posiitons includes a head unit for being held by a support structure positioned remote from the door with the head unit having a motor and a drive wheel with spaced teeth on its periphery for being driven by the motor. The operator also includes an elongate rail having a first end which is held by a support structure disposed adjacent and above the door with the rail including a pulley located adjacent the first end. The rail also includes a second end for being held adjacent to and in alignment with the drive wheel. The operator also includes a drive belt assembly for training about the drive wheel and the pulley and for being supported by the rail. The belt assembly includes a length of a plastic belt with teeth on one surface thereof matching the teeth on the drive wheel.

Abstract: A bicycle sprocket cover is formed as a unitarian molded disk of sufficient diameter to overlie and project radially outwardly beyond the teeth of a bicycle drive sprocket. The cover is attached to the sprocket by bolts, the heads of which are then covered by decorative panels having outwardly projecting tabs that are received in complimentary slots formed in the sprocket cover.

Abstract: A bicycle drive chain guide for bicycles having gear shifting capability wherein the guide can be secured to the bicycle frame and has a curved surface which prevents the chain from derailing during a gear shift.

Abstract: The present cover assembly is for providing a "custom look" and a safe enclosure for either end of the rear wheel axle on a Harley-Davidson motorcycle. The cover assembly has (1) a recessed cover which fits over and around the parts of the axle that project laterally beyond the adjacent side of the wheel and (2) a mounting bracket to which the cover is attached by screws. The mounting bracket fits on the usual axle adjuster bolt on the motorcycle so that it can be clamped against the usual rear axle/frame horn.

Abstract: An engine peripheral structure having a timing belt cover mounted on a cylinder block, an engine mount bracket fixed to the cylinder block through an opening formed in the belt cover, a water pump housing arranged adjacent to the bracket and integrally formed with annular rib. The annular rib is formed with an extended portion projected beyond surface of the belt cover through the opening. The extended portion of the annular rib of the pump housing is continued with outer surface portion of the bracket. The extended portion and the outer surface portion is extended along an edge portion of the opening of the belt cover. The bracket is formed with a circular rib facing to a remaining portion of the annular rib other than the extended portion. This structure improves a sealing property in a timing belt chamber defined by the belt cover, bracket, pump housing and the cylinder block.

Abstract: A rotating member such as a sprocket to be coupled with a shaft is formed with a fitting bore which extends on the center axis and opens at at least one of its axial end portions. The rotating member is arranged in and rotatably held by a case such that its fitting bore opens toward the outside of the case. The shaft is inserted into and coupled with the fitting bore held in the case such that it can rotate integrally with the rotating member. This rotating member is formed with an air communication portion for providing communication between the inside and outside of the fitting bore and equipped with a valve for opening or closing the air communication portion. The valve may be opened in response to the rise or drop in the internal pressure of a fitting bore, by the pressure of the shaft or by a centrifugal force. With the valve being closed, lubrication oil in the case is prevented from leaking.

Abstract: A paper feed tractor comprising a tractor frame including a pair of side frames and a belt guide disposed between and coupled to the side frames, a sprocket wheel supported for rotation between the two side frames, an endless belt adapted to be driven by the sprocket wheel to slidably travel on guide walls formed on three peripheral faces of the belt guide, and a cover mounted at a side thereof for pivotal motion on one of the side frames from and to a position in which it extends on a linear one of the guide walls of the belt guide. The endless belt has feed pins provided projectingly in a row at equal intervals on an outer peripheral face thereof, and a paper holder provided on the cover is positioned, on at least one side of the feed pins, in parallel to the outer peripheral face of the endless belt.

Abstract: A head of a sewing machine mounted on a table of the sewing machine can be turned at the rear portion thereof. A belt device is provided at the side of the head for delivering a rotary motion of a driving device to the head. A guard member is fixed to the table for covering a rear portion of a belt of the belt device which is exposed on the table. The guard member has an inclined wall upper portion provided with a notched recess for receiving the belt 7 when the head is turned rearwardly. A cover member is openable and slidable over the notched recess. The cover member is urged by a spring in a direction to be closed.

Abstract: A derailleur guard adapted to be mounted on a bicycle frame and shaped to protect a rear derailleur from impacts from a generally sideward direction. The derailleur guard includes a forward portion shaped to engage a chain stay of a bicycle frame, a rearward portion shaped to engage a dropout attached to the chain stay, and a loop portion extending between the forward and rearward portions and shaped to extend sidewardly from the frame about a rear derailleur mounted on the dropout of the frame.

Abstract: A garage door operator includes a head unit held by a supporting structure remote from the garage door. A rail has a first end held by a supporting structure adjacent the door and a second end fixed adjacent to and in alignment with a toothed drive wheel carried by the head unit. The garage door operator further includes an endless drive belt assembly trained about the drive wheel and a pulley held by the rail adjacent the garage door. The belt assembly includes a length of a plastic belt having teeth on one surface thereof matching the teeth on the drive wheel. The belt assembly further includes a trolley for connection to the garage door and a connector for joining one end of the plastic belt to one end of the trolley. The plastic belt has a lower surface to which the belt teeth extend, and the drive wheel has an upper surface to which the wheel teeth extend.

Abstract: A sprocket retention/chain guide member for use in the timing drive mechanism for an internal combustion engine where a timing chain acts to rotate the engine camshaft from the crankshaft and time the opening and closing of the inlet and exhaust valves for the engine cylinders based on reciprocation of the pistons. The retention/guide member is adapted to be mounted on the front of the engine block and has oppositely disposed arcuate grooves loosely receiving the crankshaft and camshaft sprockets and guide channels on each side of the member acting as snubbers for the chain. The member, chain and sprockets form a subassembly for shipping and ease of assembly on the block with the sprockets being received on the crankshaft and camshaft. Also, a chain tensioner may form a portion of one guide channel.

Abstract: A guard for enclosing the sprocket, trolley and chain elements of a conveyor at a sprocket wheel turn, comprises a circular cover portion having a diameter greater than that of the sprocket and a skirt extending generally perpendicularly from the entire circumferential edge of the cover portion. Portions of the skirt are severable therefrom at locations defined by the ends of the arc of the turn at which the guard is mounted to provide passages for the conveyor chain through the skirt and into engagement with the sprocket.

Abstract: An overshift preventer comprising a guard plate having a chain biasing region, a base member integral with the guard plate and adjustable horizontally adjacent the chain gears of a bicycle, and a clamp for supporting the base member and for mounting the guard plate to a bicycle seat tube perpendicularly in a spaced parallel relationship to the front chain gears.

Abstract: The chain tensioner has an arcuate curved bow with a correspondingly shaped, perforated sheet metal part extending over its entire length and which has a U-shaped cross-section. A plastics material layer is injection moulded all around said sheet metal part. A swivel bearing is located at one end, while at the other end a support part is provided, on which the bow is pressed against the chain running externally on a sliding surface.

Abstract: A railroad car hand brake has a housing with a chain opening in said housing. There is a shaft mounted in the housing which mounts a chain drum which is rotated by a drive gear. The drum is formed and adapted to engage a link chain whereby turning of the drum moves the chain inwardly through the housing opening, around the drum and then outwardly through the housing opening. A chain stripper is attached to the housing and has a portion thereof positioned between the incoming and outgoing chain, in alignment with and extending toward the drum to prevent the chain from wrapping around the drum.

Abstract: A shield for an automotive compressor clutch assembly comprises a resilient hollow part that attaches to the rotatable clutch pulley by means of an annular lip located along the inside of the hollow part and an annular groove located along the outer rim of the pulley, thereby covering the outside surface of the pulley together with the clutch mechanism located adjacent thereto. A cooperating notch and land arrangement prevents relative rotational movement between the shield and the pulley.

Abstract: Chain guide for and in relation to a chain or sprocket wheel and being made of a pair of complimentary guide shells made as press parts and having when put together a pair of vertically extending cross shaped grooves; guide noses extend above the grooves and facing each other across a narrowing closable gap and above a shaft and groove bottom portion of the sprocket wheel.

Abstract: A transmission unit comprises a flexible element (1) in the form of a flexible metal wire (6) on which a plurality of small equidistant coaxial cylindrical bodies (8) are fixed; the element (1) passes endlessly about two opposing drive and driven sprocket wheels (2), (3) respectively, and the two outward and return portions of said element (1) are slidingly received in two flexible sheaths (10); the two sprocket wheels (2), (3) are rotatably mounted in respective casings (4), (5) in which the opposing ends of said two flexible sheaths (10) are clamped.

Abstract: A front derailleur for a bicycle which is provided with a linkage mechanism formed of a fixing member, first and second linkage members, and a movable member. The first and second linkage members are pivotally supported through first and second pivot shafts to the fixing member. The first and second pivot shafts are each fixed at one axial end thereof to the fixing member and, pivotally support at intermediate thereof the linkage members respectively. The first and second pivot shafts are connected at their other axial ends by a connector, so that a load due to an operating force to operate the linkage mechanism is dispersed to the first and second pivot shafts, thereby enabling the front derailleur to be miniaturized and inexpensive to produce.

Abstract: A suspension and drive arrangement for an off the road motorcycle having a balloon tired rear wheel. The rear wheel is suspended for movement relative to the frame by a Y-shape trailing arm and a pair of vertically extending suspension elements are interposed between the trailing arm and the frame for cushioning shock transmitted to the rear wheel. The rear wheel is driven by a chain drive including a first chain that drives an intermediate shaft and a second chain which drives the rear wheel from the intermediate shaft. The first chain is positioned inwardly of the second chain and a pair of embodiments illustrate devices for cooling the first chain. In one embodiment, the chain is cooled purely by ram air whereas the other embodiment provides cooling with both ram air and forced air flow.

Abstract: An arcuate wear plate mounted underlying the starter motor housing of a motorcycle protecting the same from engagement by an adjacent drive chain.

Abstract: There is disclosed a cover structure in a power transmission device comprising a casing having an open side, a driver shaft rotatably supported by the casing, a driven shaft rotatably supported by the casing and drivable by the driver shaft, a power transmission mechanism housed in the casing for transmitting rotative power from the driver shaft to the driven shaft, a starter mechanism housed in the casing and engageable with the driver shaft for starting an engine, and cover means covering the open side of the casing. The cover means comprises a plurality of cover members, a cover member which supports the starter mechanism being securely coupled to the casing, the remaining cover member or members being coupled to the casing through a resilient member or members.

Abstract: An apparatus and method for effectively minimizing sound emanation from a power transmission belt drive and providing extended useful life of the power transmission belt by reducing the operating temperature thereof. In the illustrated embodiment, the drive system is enclosed in a housing having one or more inlets and one or more outlets. Air moving structure is provided in association with the pulleys for causing air flow through the interior of the housing from the inlets to the outlets as an incident of operation of the drive system. In the illustrated embodiment, the pulleys are formed of heat conducting material so as to transfer heat from the belt to the air being flowed through the interior of the housing, thereby reducing the operating temperature of the belt.

Abstract: A chain guard fastener for secure fitting of the down tube and the seat tube of a bicycle comprises a fastening means and bolt having a key projecting in front thereof to permit engagement with a counterpart keyway provided on the chain guard. The fastening means is made of molded plastic, and includes a median split and a cylindrical form projecting out of a pair of symmetrically disposed faces, two suitably formed bolting ports traversing the pair of faces on either side thereof so as to permit passage of a bolt therethrough. One end of the bolt is stopped, while the other end of the bolt goes to a continuously toothed groove, in close proximity of the teeth.

Abstract: A belt guard for clutch motors for industrial sewing machines comprises a cover made of two cover halves which can be clapped together. This cover extensively covers a V-belt pulley part of which accommodates a V-belt. In order to achieve an effective ingoing belt safety device which can be adapted to suit a variety of V-belt pulley diameters without exceeding the permissible maximum distances to the ingoing V-belt section on the one hand and to the V-belt pulley on the other the ingoing belt safety device comprises a safety pin extending into the wedge-shaped area between the ingoing V-belt section and the V-belt pulley. This pin can be attached to a safety slide bar fixed to a cover half in an adjustable manner, or to a disc serving as a mount for the cover halves.

Abstract: A bicycle chainguard having a housing shaped to cover the top run of a bicycle chain with a curved forward end portion extending at least partially around a front sprocket. The housing has a pair of keyhole-shaped through-slots formed in a vertical wall. Clamps encircle seat and down tubes on the frame of the bicycle. Each clamp has a lug extending into a corresponding through-slot. Each lug has a shank with a diameter sized to fit within the through-slot, and an enlarged head sized to pass through an enlarged end portion of the keyhole-shaped through-slot. The longitudinal axis of each through-slot is oriented tranversely to the axis of the corresponding frame tube enabling assembly of the lug in the slot in a wide range of positions along the axial length of the through-slot to accommodate a range of angular orientations of the frame tubes for different model or style bicycles.

Abstract: A rear derailleur for a bicycle is provided with a chain guide having a guide pulley, a tension pulley and pulley plates carrying both of the pulleys, for switching a driving chain to any desired particular sprocket of a multistage sprocket assembly for changing the bicycle speed. A holder is provided at the pulley plate positioned closest to the multistage sprocket assembly and is positioned outside the path of movement of the chain travelling from the tension pulley to the guide pulley. When the chain is driven in reverse from the multistage sprocket assembly to the guide pulley, the holder holds the chain along the aforementioned path, whereas the chain would otherwise be caused to leave the path.

Abstract: A universal or ball pivot-link chain is guided in two substantially tubular-shaped guide channels and is deflected or turned between such guide channels by means of a driven chain or sprocket wheel. At its circumference the chain wheel possesses a profiled structure formed by recesses or depressions which substantially correspond to the profile or outer contour of the universal link chain. The guide channels extend to the circumference of the chain wheel and form in conjunction therewith a respective transfer or transition region. At each such transfer region the chain wheel protrudes by an amount, essentially corresponding to the depth of the recesses, into the interior of the related guide channel. At such transfer or transition regions the chain links are guided both by the chain wheel and the guide channels. Consequently, there is ensured for a gentle and jerk-free transfer of the chain links from the chain or sprocket wheel to the guide channels and vice versa.

Abstract: A belt-drive assembly for use on air-moving systems in corrosive atmospheres comprising a larger non-metallic driven sheave in conjunction with a smaller metallic driver sheave wherein the metallic sheave may be located in a vented enclosure is disclosed. This arrangement prevents corrosion of the drive system and prolongs belt life.

Abstract: A chain guide in a front derailleur has an inner guide plate and an outer guide plate, the outer guide plate having a chain biasing region coming into contact with and biasing a driving chain when the chain is switched from a larger diameter front chain gear to a smaller diameter front chain gear and a chain moving region which is positioned below the biasing region and through which the chain moves when the chain is switched to the smaller diameter front gear. The chain moving region includes a swollen portion swelling outwardly with respect to the front chain gears, thereby eliminating sound generation without sacrificing speed change efficiency.

Abstract: A drive apparatus is provided for driving the cutterhead of a forage harvester forward and in reverse. The drive apparatus comprises a hub mounted at one end of a transverse shaft that drives the cutterhead. The hub is connected to and movable along this transverse shaft between a driving position and a non-driving position with respect to another transverse shaft that is connected to a tractor PTO. The cutterhead may be driven forward when the hub is in the driving position and in reverse when the hub is in the non-driving position. A removable belt may be utilized to drive the cutterhead in reverse.

Abstract: An apparatus for forming helically wrapped spine fin heat exchanger tubes is disclosed which includes a rotatable cutter head operable to cut a strip of thin metal to provide a base portion and a multiplicity of spines integrally joined at one end to the base portion. A tube feed is provided to axially feed smooth tubing past the cutter head. As the tube is fed past the cutter head the cutter head operates to helically wind the spine fin material on the tube. A first drive is provided to drive the tube feed and cutter head in time relation to ensure that the tube is fed through a predetermined minimum distance during each revolution of the cutter head. A second drive is provided to increase the distance through which the tube is fed during each revolution of the cutter head to increase the helix angle of the material being wound onto the tube and correspondingly reduce the spine fin density at selected locations along the tube.

Abstract: A device for preventing separation of a belt from a motor pulley comprises a protection cover for covering a pulley attached to the output shaft of a motor, a guide slot formed in the protection cover extending into a predetermined direction, a belt separation preventing plate supported on the side of the motor pulley by a supporting body which passes through the guide slot, and retaining device associated with the supporting body to fix the plate to the protection cover by a spring pressure.

Abstract: A bicycle chainguard having a housing shaped to enclose a bicycle chain and sized to extend about the front sprocket and pass rearwardly to the rear sprocket of a bicycle, at least one lug extending sidewardly from the housing having a shank and a head of larger cross-sectional area than the shank, a clamp having a flexible body sized to wrap around a portion of the bicycle frame adjacent the front sprocket and having opposing ends forming recesses so that the ends may be jointed to form a socket to receive the lug therein, and a clip to mount the housing to the upper rear of the frame. The socket preferably is sized to provide sufficient clearance with said lug to permit relative rotational movement therebetween so that the chainguard may be adjusted to be mounted to a variety of bicycle frames. The ends of the clamp may be secured by a screw and nut.

Abstract: A universal flexible sprocket shield adapted for pedal crank attachment by any user of single, three speed, or ten to fifteen speed bicycle. A modified shield is adapted for original equipment installation as a flexible shield extension to existing sprocket plates.

Abstract: A front sprocket wheel for bicycles which comprises an annular member in the form of an integral molding made of plastics or the like and including a chain guard, an outer gear and support arms, and a plate member made of an integral metal plate and including a boss portion, an inner gear positioned around the boss portion and connecting arms interconnecting the boss portion and the inner gear. The support arms of the annular member are fixed to the connecting arms of the plate member.

Abstract: The mud guard system for a chain of a motorcycle in which a drive chain is made to run on both a front sprocket connected to an engine and a sprocket connected to a rear wheel at the trailing end of a rear fork, comprises a mud guard member having a cylindrical shape for allowing the chain to run therethrough and disposed at one side of the rear wheel and a link or another connecting member for coupling the mud guard member floatingly to the rear fork so that the mud guard member can move in the longitudinal direction of the chain.

Abstract: Disclosed is a crank for a bicycle, having a chain wheel mounted thereto by an adapter, the adapter having at least one annular member formed at the foremost ends of legs extending radially outwardly of a boss of the adapter and connecting the legs with each other and chain wheel mounting means provided at at least one of the leg and adapter.

Abstract: A sewing machine with a timing belt for transmitting power from a toothed driving pulley to a toothed driven pulley that rotates a loop taker is provided at each pulley on the belt entering side only with a belt guard which guides the belt onto the pulley and prevents teeth on the belt from jumping over teeth on the pulley.

Abstract: A transmission for multi-speed freewheels or a multi-speed gear system of a bicycle, which comprises two or more sprockets or the sprockets and a chain guard, formed by punching a metallic plate member; at the same time, a plurality of connectors are formed integrally with the sprockets and chain guard so that the sprockets or those and the chain guard may be regularly spaced with the connectors respectively in the relationship that the members are adjacent each other.

Abstract: A debris deflector for a motorcycle which employs a belt drive for the rear wheel includes a deflector plate positioned between the motorcycle swing arm and the tire. The deflector is located between the runs of the belt. The deflector includes an indentation in the area of the swing arm, an upper portion which extends below the upper run of the belt and extends beyond the outer edge thereof and a lower portion below the swing arm which terminates inwardly of the inner edge of the lower run. The debris deflector of the present invention may also include a tab extending across and spaced apart from the front edge of the tire and may further include a flexible flap attached to the fender of the motorcycle which extends downwardly from the front edge of the fender and passes between the tab and the wheel.

Abstract: A multi-mode copying or reproduction apparatus. The apparatus includes a movable, overlong flexible photoconductive belt having image exposure, developing, transfer and cleaning stations operatively disposed about the belt circumference. A two chamber vacuum tensioner is used to collect the extraneous belt length. A raster scanner capable of both writing and reading images on the belt segment laying between the vacuum chambers is provided, together with an auxiliary belt driver for moving the aforementioned belt segment at a speed compatible with that of the raster scanner. An auxiliary charging device, and operators for disengaging selected xerographic components permit selective processing of images written or read by the raster scanner.

Abstract: The guard retains the cable on a pulley of a cable control system that indes another pulley mounted on a pivotable radius arm for swingable movement relative to it. Usually, the swingable pulley is linked to a third pulley mounted on a hinged structural member which itself swings with the radius arm to and from `closed` or `open` positions. When the arc is wide, i.e. around 180.degree., conventionally mounted guards engage and bind the swinging cable. The present guard is an elongate member pivotally mounted on the radius arm. In the `closed` position, a retaining flange formed on the guard moves for cable retaining purposes into close proximity with the fixed pulley and the proximity or clearance can be adjustably fixed and locked by an eccentric stop. During the `opening` swing, the cable engages the guard which then pivots sufficiently to prevent the undesired binding. The pivotal range of the guard is restricted by a pin and slot arrangement.

Abstract: A rear hub for a bicycle, which has a hub shell supported rotatably to a hub shaft through a pair of bearings and which carries two or more sprockets at one axial end of the hub shell which are freely rotatable in one direction, is provided with a protector disposed axially outwardly the smallest diameter high speed sprocket. The protector has a diameter larger than the high speed sprocket, and is supported to a rear hub fixing member fixed to the hub shaft.

Abstract: A chain sprocket having guide plates comprising flanges of a frangible material located along opposite sides of the sprocket is disclosed teeth and projecting outwardly therefrom to prevent lateral disengagement of the chain under conditions of severe usage, particularly with use of the sprocket and chain assembly on a racing motorcycle. The guide plates are particularly useful in guiding the slack lower reach on of a motorcycle chain during acceleration of a motorcycle, and are also useful in guiding the slack upper reach of the chain during deceleration.

Abstract: A front derailleur for a bicycle is of the link type and comprises four members of a fixing member, two linkage members and a movable member, one of the four members carrying a chain guard for preventing a driving chain from coming off a front gear. The chain guard comprises a mounting plate for mounting to one of the four members and at least one guard plate for preventing the chain from coming off of the gear.