Showing papers on "Pulley published in 1971"

Belt and belt drive assembly

Abstract: A flexible power transmission belt used in conjunction with toothed and/or grooved pulleys of a belt drive assembly and capable of driving from opposite portions thereof. The belt includes one driving portion which is preferably transversely toothed to mesh with toothed pulleys and an opposite longitudinal plural V-ribbed driving portion which engages at least one grooved pulley. The belt is particularly useful in belt drive assemblies in which the arc of contact between the plural Vribbed driving portion of the belt and the pulley is small or relatively small with the required high tension materially increasing stresses on the tension member of the belt.

Continuous tube sealer

Abstract: A tube former directs a web of unsupported polyethylene film into tubular form about a cylindrical mandrel with its longitudinal edges overlapping. An endless belt of Teflon impregnated Fiberglas is trained over idler pulleys to a run along the overlapped edges and a heater device heats the belt and film to fuse the overlapped edges and cause them to adhere to each other and to the belt so that the belt is pulled along as the tube is drawn along the mandrel. Cooling means then cools the belt and film and one of the idler pulleys strips the belt from the sealed tube. The heater is moved to and from the belt under the control of the cooling means.

Bearing of the conical discs of an infinitely variable cone pulley transmission

Abstract: On the driving and/or driven side of an infinitely variable cone pulley transmission the pulley discs are urged against a shoulder of the transmission shaft by the force of a helical coil spring exerted on the disc pair in axial direction. The annular surface of the shoulder which faces the cone discs and the annular surface of an extension of the hub of the cone disc which faces the shoulder are used as the bearing surfaces or races of a thrust bearing. The thrust bearing comprises roller elements mounted rotatably on a support ring and having the form of oblate spheroids. By this particular form the frictional sliding movement between the roller elements and the bearing surfaces, resulting from the wobble movement of the pulley disc, is turned into a purely rolling motion.

Mini bike drive kit

Abstract: A belt transmission kit for mini bikes and the like provides variable ratio drives with small offset between the belt plane and the drive chain. A mounting plate which bolts to the engine supports a jackshaft spaced from the crankshaft. Variable-width, asymmetric V-groove pulleys on the crankshaft and countershaft both have flat fixed pulley flanges on the inner side of the belt, close to the mounting plate, and movable pulley flanges on the outer side. This keeps the belt aligned in a plane close to the engine, and permits use of a drive sprocket and chain drive to the rear wheel in a plane only slightly offset from the belt, at the same side of the engine. The kit can be mounted on a direct-drive mini bike by removing the direct-drive sprocket, from the crankshaft, mounting the kit, and shortening the chain.

Pulley block with brake

Abstract: A pulley block having a brake structure which, if necessary, can be manually released. A supporting structure carries a pin on which a pulley is rotatable. The pulley has an outer periphery at least one portion of which is at a greater radial distance from the pin than other portions of the outer periphery of the pulley. An elongated flexible member such as a rope or cable is guided around the pulley to participate in the hoisting of a load. A wedge structure is carried by the supporting structure to cooperate with the pulley, and in particular the latter one portion of its outer periphery, for automatically gripping the flexible member when the load is released, and a manually operable structure is available to be used, if necessary, for releasing the flexible member from wedging engagement between the pulley and the wedge structure.

Motor drive for a lawn mower

Abstract: A motor is clamped on a fixed shaft extending between the wheels of a lawn mower. A belt is entrained about both a drive or first pulley on the motor shaft and a driven or second pulley on a rotary reel shaft that also extends between the wheels. An idler pulley is mounted on a shaft attached to the outer housing or frame such that the belt may be tightened by adjusting the clamp that secures the motor to the fixed shaft. The second pulley can be drivingly attached to the reel shaft by various means such as radial set screws disposed in a hub of the pulley and/or a protuberance formed on the pulley for cooperative engagement with the cutting reel of the mower to thereby turn the shaft and reel. Two unidirectional clutches (a right and a left) are arranged and oriented such that reel rotation in a forward direction will drive the wheels in a forward direction.

Transmission gearshift indicator

Abstract: In a preferred form, this disclosure relates to an indicator mechanism for a transmission control system. The indicator mechanism comprises a housing means which has a dial associated therewith with spaced representations corresponding to different transmission settings, a pulley which is supported by the housing means for movement in opposite directions adjacent the dial, spring means which biases the pulley toward one end of the dial, a pointer which is adapted to move in opposite directions with the pulley to positions adjacent different ones of the representations to provide a visual indication of the transmission settings, and a cable which extends around the pulley and which acts in opposition to the spring means. The cable is adapted to be connected to a rotatable gearshifting member. The pulley rotates and moves in opposite directions adjacent the dial in response to movement of the gearshifting member to effect different transmission settings whereby the pointer is moved across the dial distances less than those traveled by the cable.

Hand-held power tool with rotary tool disc at end of reversible forwardly projecting arm

Abstract: A hand-held power tool has a circular saw or other disc-shaped tool at the forward end of an arm projecting forwardly from the one side of the engine chassis. The arm is reversible so that the tool disc can be positioned either directly ahead of the engine chassis for normal use or at one side for cutting close to an obstruction. In both positions the tool disc is driven by a belt from a drive pulley on the engine drive shaft.

Oscillation damping arrangement for the load carrier of a hoist

Abstract: Oscillation of a load carrier on a travelling hoist in the direction of hoist travel is damped or suppressed by a stabilizing cable whose ends are wound on respective sections of the cable drum assemblies at the fore and aft ends of the hoist platform, while the central portion of the stabilizing cable is trained, in sequence, over a reversing guide pulley on the load carrier, a resiliently mounted pulley on the platform, and another reversing pulley on the load carrier. The central portion of the stabilizing cable diverges in a vertical plane parallel to the direction of hoist travel from the two pulleys on the load carrier toward the platform so that the frictionally engaged guide pulleys turn when the load carrier oscillates horizontally in the vertical plane. The pulley mounted on the platform is provided with a friction brake which impedes or suppresses its rotary movement, and thereby impedes or suppresses horizontal oscillation of the load carrier.

Drill press or like variable speed drive

Abstract: A vari-speed pulley drive transmission for overarm machine tools, such as drill presses and similar tools having depending tool spindles, and speed selector control means and spindle return spring tension adjustment means therefore. The speed selector control means is characterized by the inclusion therein of a selector knob and adjustable friction drag means accessible to an operator standing in operating position in front of the machine tool and eccentric pin connector means journalled in a shifter ring carried by the shiftable sheave of the driven vari-speed pulley and providing a pin and slot connection with the shifter lever for calibrating the speed of the vari-speed pulley drive with the selector knob and its associated speed scale graduations.

On the Running Noise of Toothed Belt Drive : 2nd Report, Influence of Running Condition and Some Noise Reduction Methods

Abstract: In this report the authors investigate the influence of the construction and the dimension of toothed belt and some running conditions on the noise of toothed belt drive, and show some running noise reduction methods and their effectiveness. The running noise level varies with belt speed, belt tension and polygon-effect of the wheel, but there is no difinite tendency between noise level and number of teeth and module of the wheel. The effective methods to reduce the meshing impact sound and to keep the toothed belt drive silent are: (1) to soften the bottom lands of toothed belt or the tooth tip lands of wheel, (2) to make belt width narrow, (3) to cant the belt of tension side with an idle pulley, (4) to make the wheel noncylindrical, especially as barreled-shape.

Low slip belt drive

Abstract: A low slip belt drive in which a thin, highly preloaded steel belt is wound around a drive wheel and a reversing wheel, and in which an elastic tensioning element forms a belt lock aad also dampens vibrations originating in the steel belt and drive.

Transmission and steering systems for vehicles provided with non-steerable wheels

Abstract: A transmission and steering system for vehicles having nonsteerable wheels, for instance a two-track vehicle. The system comprises a steering member, such as a bicycle handle-bar, rotatably mounted in the vehicle and controlling in inverse manner a pair of variable diameter pulley transmission units, each connected to a non-steerable driving wheel or sprocket of the vehicle and each driven by the vehicle engine, whereby turning of the steering member progressively decreases the rotational speed of one driving wheel of the vehicle, while increasing the rotational speed of the other driving wheel, in order to obtain a smooth and progressive turning movement. The system is preferably connected to the engine through a centrifugally-operated variable diameter pulley and belt system, in order to automatically and progressively vary the transmission ratio between the engine and the vehicle driving wheels as a function of the engine speed. A manual device mounted on the steering member for adjustment by the driver, enables to vary the turning radius of the vehicle for a given angular position of the steering member.

Metal belt drive

Abstract: A positive traction belt drive having a belt made from beryllium-copper metal and having apertures which are drivingly engaged by dowels on the periphery of a pulley. The belt engaging periphery of the pulley is crowned to reduce belt wear and provide for improved tracking.

Emergency traction splint

Abstract: Traction splint to maintain alignment of leg with fractured long bone. Splint has telescoping tubes, upper tube having crotch piece to locate end of splint against perineum, and lower tube, slidable within upper tube for splint length adjustment. Harness to fit around ankle of fractured leg is secured to one end of cable, opposite end of cable secured to spring secured to lower tube. Lower tube has pulley at lower end for cable, so as to reverse tension of spring to apply traction to leg. Cable is engaged with pulley so as to prevent slippage and circumferential graduations on pulley read in conjunction with index indicates traction on leg. Stop means limits rotation of pulley above maximum design traction.

Infinitely variable cone pulley transmission

Abstract: In an infinitely variable cone pulley transmission the cone pulley pair on one of the two shafts (driving or driven) is pressed together by a helical coil spring and on the other shaft by a hydraulic force. On the hydraulically operated side the axially displaceable cone disc and the transmission shaft form together a cylinder and piston arrangement. A particularly compact dimensioning of the transmission and the control device is achieved by arranging the pressure pump housing immediately adjacent the transmission housing. The pressure pump housing contains in one block a slide valve for regulating the hydraulic pressure, lines for guiding the pressure liquid, first mechanical elements for automatically sensing and controlling the transmission ratio, and second mechanical means for manually overriding the automatically adjusted ratio.

Right and left hand lawn edger-trimmer

Abstract: A wheel supported frame supports an engine having a V-belt pulley connected to the respective opposing ends of its crank shaft A V-belt, pulley and guard shielded cutting blade are mounted on respective ends of an axle journaled by a housing attached to one end of a rod which is supported, at its other end, at the forward respective right and left sides of the frame, by a bracket moved vertically by control means Rear wheel axle mounting means permits individual lateral and vertical movement of the two rear wheels for horizontally supporting the frame adjacent a curb, or the like

Pulley belt assembly

Abstract: A flat belt pulley transport employs spaced pulleys each constructed as a set of radially slotted discs which are flexible in response to transverse forces imparted between the belt and pulley. The belt is retained on the pulleys by spaced non-rubbing guides which deflect the belt back to tracking position whenever a transverse movement of the belt occurs. The flexible ribs of the discs minimize both lateral forces tending to detrack the belt and corresponding resistance to restoring forces from the guides. Where a sprocket drive is used the sectors between slots are also flexible in the direction of belt motion to compensate for sprocket and hole misalignment.

Reversible transmission, especially for field harvesters

Abstract: A reversible transmission, especially for the pickup, feed and/or drums of a field harvester, in which a pair of fixed shafts from input and output members of the transmission and a further shaft is mounted upon a support swingable about the axis of one of the shafts. This intermediate or swingable shaft carries a V-belt pulley which may be connected with the V-belt pulley of the other fixed shaft when the intermediate shaft is urged away from the latter to tension the belt. A pair of friction wheels on this intermediate shaft and on the other shaft are brought into engagement when the intermediate shaft is swung in the other direction. The wheels of the intermediate shaft are connected operatively to a wheel of the first-mentioned shaft about which the support is swingable.

Buoyant pulley locating and anchoring device for an oil mop

Abstract: The present disclosure is directed to a buoyant pulley for use with an oil mop for positioning the pulley and locating same to maintain the pulley in substantially the desired height in the water and at substantially a horizontal attitude against the pull of the endless oil mop passing about the pulley.

Vee-belt spring-o-matic power transmission

Abstract: A vee-belt and a pair of spring-loaded vee pulleys comprise an automatic transmission which increases torque as necessary (at the expense of speed) or automatically increases speed when high torque is not necessary.

Sheet cutting apparatus

Abstract: A cutter receptor extends transversely across the path of movement of sheet material to be cut, and an endless belt is trained over a pair pulleys for movement adjacent and substantially parallel to the cutter receptor A disk-shaped cutter is rotatably mounted on the endless belt and spring biased to press toward the cutter receptor to cut cut a predetermined length of sheet material during movement of the belt One pulley is driven by a driving mechanism which is under the control of a control mechanism selectively operable to activate the drive mechanism to rotate the pulley to advance the cutter from a retracted starting position into rotating engagement with the cutter receptor and therealong to cut a length of sheet material, after which the rotation of the pulley is continued to return the cutter to its retracted starting position In one embodiment of the invention, the driven pulley is fixed to a shaft on which there is rotatably mounted a gear A coil spring has one end secured to the shaft and its other end secured to a housing rotatable with the gear, and a driving pinion meshes with the gear The driven pulley is normally latched against movement but, when the latch is released, the spring rotates the driven pulley to drive the belt carrying the cutter During the time that the pulley is latched against movement, the pinion rotates the gear to rewind the spring Control elements are associated with the shaft and with the gear, and effect operation of a microswitch controlling energization of a motor for driving the pinion In another embodiment of the invention, the driven pulley is rotated by an electric motor whose energization is controlled by control cams operatively associated with control switches

Hunting-tooth timing bolt

Abstract: A toothed belt or timing belt in a mechanical drive system, which has a number of teeth incommensurable with the numbers of teeth on the pulleys, and preferably a prime number. With this relationship, every tooth on the belt will, during operation, engage every tooth on a pulley in a progressive repeating series, thus equalizing wear and minimizing damage to the belt from repetitive engagement with any deformed or defective pulley tooth, e.g., one having a burr. The invention is useful in drive systems which necessarily have a simple ratio, such as the 2:1 ratio between the crankshaft and camshaft of an internal combustion engine.

Specimen stages for electron microscopes

Abstract: A specimen stage for an electron microscope having a wire-driven gimbal assembly. The assembly is so designed that there is no interaction between the tilting of the inner and outer gimbals. The drive for the gimbals comprises two wires, each of which is attached at one end to a drive pulley and at its outer end, after passing around a guide pulley pivoted about the outer gimbal axis, is coupled to the inner gimbal. Thus, when the outer gimbal is tilted, the wires wind on to or off of the guide pulleys, causing the drive pulley to move towards or away from the gimbals, but with substantially no tilting of the inner gimbal.

Variable diameter centrifugally-operated drive pulley

Abstract: A variable diameter pulley for use as a drive pulley in a V-belt drive assembly in which the axially movable pulley half is moved towards the fixed pulley half under action of centrifugal forces, said centrifugal forces being produced by a liquid filled annular flexible liquid-tight tube disposed in a chamber defined by the axially movable pulley half, a cylindrical wall depending from the periphery thereof and a disc secured to the drive shaft. Rotation of the liquid causes flattening of the tube with increase of rotational speed, thereby displacing the movable pulley half towards the fixed pulley half.

Power transmission pulley and means for changing the diameter of same

Abstract: A power transmission pulley having a metal hub and grooved rim for receiving a belt with a plurality of adaptor rings of plastic material for incrementally changing the diameter of the pulley. Each ring has a circumferential rib on the inner periphery and a belt groove on the outer periphery. The adaptors are nested concentrically over the rim of the pulley. Each adaptor ring is axially assembled by circumferential stretching over the rim or previously assembled adaptor ring with the rib received in the belt groove.

Transmission having direction control

Abstract: A power transmission is provided with a pair of belts interconnecting a drive and a driven sheave in an arrangement which permits selective rotation of the driven sheave in either direction by movement of corresponding idler pulleys alternately from a neutral position to their belt tightening positions. A lost motion assembly forming a part of an extensible toggle link connection with one of the belt tightening units makes it possible to use but a single actuator to control the entire operation.

Apparatus for starting rope-pull engines

Abstract: Apparatus for starting small, internal combustion, manually started engines. The apparatus comprises a base frame from which a track extends, ending in a brace which abuts the engine to be started, thereby preventing relative movement between the engine and the apparatus. A carriage having structure for gripping the engine starting handgrip is mounted on the track and may be moved away from the engine and toward a motor-driven pulley on the base frame by means of a cord, extending between the carriage and the pulley, and wound upon the pulley. The pulley may be connected to the drive motor through a normally open clutch. The clutch is actuated to the open position by means of a safety lever which must be actuated by the operator before the pulley will pull the carriage away from the motor to be started. As the carriage reaches a position adjacent the frame upon which the pulley is mounted, it actuates a cam adjacent the end of the track to force the clutch into the disengaged position against the action of the safety lever. The rewind spring of the engine''s starter, acting through the starting rope, then causes the carriage to move back toward the engine and return to the initial position. There, the carriage actuates a push-bar at the opposite end of the track which pulls the cam away from the clutch-disengaged position, causing reengagement of the clutch for the commencement of another cycle of the operation, if the safety lever is still actuated.

Adjustable belt-and-pulley transmission

Abstract: An adjustable belt-and-pulley transmission wherein a rotary shaft carries a pulley composed of a side wall which is fixed to the shaft and an adjustable side wall which is axially movable along the shaft while being constrained to rotate therewith These pulley side walls have inner tapered surfaces forming parts of cones whose apexes coincide with the axis of the shaft so that a belt engaging these surfaces can have its radial distance from the shaft regulated in accordance with the axial distance of the adjustable pulley side wall from the fixed side wall thereof The adjustable pulley side wall has an elongated collar fixed thereto and surrounding the shaft with clearance, this collar being formed with an elongated slot which extends longitudinally of the shaft Between the collar and the shaft is a longitudinally slit wear-resistant, self-lubricating, resilient sleeve which prevents direct contact between the collar and the shaft and which because of the slit is capable of automatically expanding and contracting around the shaft and within the collar in response to temperature changes A motion-transmitting structure is fixed to the shaft and extends through the sleeve into the slot of the collar for providing transmission between the adjustable pulley wall and the shaft, and this motion-transmitting structure has within the slot of the collar a covering material which is wear-resistant and resilient for directly engaging one or the other of the side surfaces of the slot of the collar so as to prevent wear and reduce friction at the point of engagement between the motion-transmitting structure and the adjustable pulley wall An elongated cover covers the slot and covers the motion-transmitting structure, and this cover is surrounded by a bearing structure which is carried by the collar and which serves to retain the cover at the slot, an adjusting structure being connected to the bearing for acting through the latter on the adjustable pulley side wall for shifting the latter axially with respect to the shaft

Belt drive for plurality of single groove sheaves

Abstract: A power transmission in which a plurality of single groove sheaves are driven unidirectionally by a single, continuous belt having but one arc of contact with each sheave respectively. Each of the driven sheaves and an adjacent idler pulley are essentially coplanar thereby presenting a compact transmission requiring minimal operating space. The configuration of the belt is such that there is no more than one-quarter turn in any one stretch of the belt. Structure is provided to preclude contact of those stretches of the belt which cross one another.