Showing papers on "Pulley published in 1980"

Belt tensioner construction

Abstract: A belt tensioning device for an endless drive belt for a vehicle accessories drive system. A sheet metal bracket is adapted to be mounted on an engine in a stationary position adjacent the drive belt and has a lever plate pivotally mounted thereon. An idler pulley is rotatably mounted on the lever plate and is movable into belt tensioning engagement by coil springs mounted on the bracket and engaged with the lever plate. A pair of pockets is formed in the bracket, each of which has an inclined surface which extends upwardly toward the lever plate. A camming block formed of a friction material is movably mounted in each pocket. Each block has an angled surface which is slidably engaged with the inclined surface of the pocket and has a planar coupling surface which frictionally engages the lever plate. The friction blocks provide a damping force on the lever plate when the lever plate attempts to move in the non-belt tensioning direction. Coil springs are mounted in the pockets and exert a biasing force against the camming blocks to move the blocks along the inclined surfaces of the pockets and into engagement with the lever plate. The springs maintain a predetermined coupling force between the blocks and lever plate throughout the life of the camming blocks and drive belt.

Aerial gymnastic exerciser

Abstract: The invention is an aerial gymnastic exerciser having a pair of handles depending from cords threaded through compound pulley systems located between upper and lower supports with a body harness depending from the lower support. Increase or decrease in resistance to operation of the exerciser by an operator suspended in the harness and pulling on the handles is achieved by a plurality of removable weights depending from one end of cords passing upward and over part of the pulley systems and back downward with the other ends secured to the handles. Other modifications for resistance can be by either removable weights secured to the lower support, or by removable clothespin type springs with respective ends of each removably secured to the upper and lower supports or by use of both the removable weights and springs. Resistance can also be adjusted by how much the pulley systems are compounded.

Engine-gear arrangement for vehicles, in particular passenger cars

Abstract: A system for driving a motor vehicle with a infinitely variable belt gear is provided with an engine transversely positioned to the longitudinal direction of the vehicle. First and second drive-cone pulleys are provided for transmitting the rotational force of the engine. A clutch couples the engine with the drive-cone pulleys. A V-belt or chain drivingly connects the first and second output cone pulleys with the first and second drive-cone pulleys. A planetary gear drive with a sun gear, a ring gear, and a planetary gear carrier carrying planet gears is driven by the first and second output cone pulleys. A differential gear for driving the axles of the vehicle is coaxially positioned to the planetary gear with a drive gear coupling the differential gear with the planetary gear.

Belt tensioning device

Abstract: A belt tensioning device including a mounting bracket, a pulley support arm pivotally mounted at one end on the mounting bracket and having an idler pulley rotatably mounted at its other end. A spring yieldably biases the arm in a direction to press the idler pulley against the belt. The arm has opposed wall faces disposed in planes perpendicular to the pivot axis of the arm and mounted on the bracket and have pad faces pressed into engagement with respective ones of the opposed wall faces on the arm to dampen vibration or oscillation of the arm.

Power transmission for two-wheeled vehicle

Abstract: A power transmission for a two-wheeled vehicle includes a variable-diameter drive pulley mechanism (2) mounted on a drive shaft (1) connected to an engine (E), a variable-diameter driven pulley mechanism (22) mounted on a driven shaft (18) operatively coupled with a driven wheel (W), and a clutch (36) mounted coaxially on the driven shaft (18) and operatively connected to the driven pulley mechanism (22). The drive and driven pulley mechanisms (2,22) are interconnected by a V-belt (7). The drive and driven pulley mechanisms (2,22) have axially movable members (5,24) located on opposite sides of the V-belt (7) adjacent to the engine (E) and the clutch (36) to allow parallel displacement of the V-belt (7) during the changing of the diameters of the pulley mechanisms (2,22), to prevent belt twisting or distortion and to prevent the belt (7) and pulley mechanisms (2,22) from being loaded while the vehicle is moved around with the engine (E) turned off.

Miniature belt grinder

Abstract: A portable belt grinder having a casing, a drive pulley supported in the casing, a contact pulley mounted on an arm extending from the casing, an endless belt trained about the pulleys and a belt tensioning assembly having a roller eccentrically mounted on a manually rotatable rod, a camming surfaced plunger coacting with the roller and a spring interposed between the arm and the plunger. A cover is pivotally mounted on the casing having an aperture which coacts with a latching button rotatably fixed to the casing and having a vertical axis slightly spaced from the vertical axis of the aperture.

Drive transmission unit incorporating expansible-pulley stepless speed changer

Abstract: A drive transmission unit for a motor vehicle incorporates an expansible-pulley stepless speed changer arranged to drive a differential unit via a reduction gear box and a selectively-operable reversing unit. The speed changer has a primary shaft which serves as the input shaft of the transmission unit, and a hollow secondary shaft parallel to, and driven from, the primary shaft. The reversing unit, reduction gear box and differential unit are all epicyclic in form and are arranged in that order side-by-side coaxial with the secondary shaft. Two output shafts connect the differential unit to the half shafts of the vehicle with one of the output shafts passing coaxially through the secondary shaft. This arrangement provides for a very compact transmission unit. The reversing unit can be set in one of three states in which respectively, the secondary and output shafts are arranged to rotate in the same sense, to rotate in opposite senses, and to be drivingly disengaged.

Power transmission system

Abstract: A torque transmission system has driving and driven pulley units around which an endless V-belt extends. Each pulley unit has a stationary pulley part rotatable with a shaft and a movable pulley part disposed to define with the stationary pulley part a circumferentially continuous groove for receiving the V-belt. The movable pulley parts of the pulley units are axially resiliently biased so that the radii of the circle along which the V-belt engages the driving and driven pulley units are varied to change the speed-change ratio of the transmission system. The movable pulley part of the driven pulley unit is axially shifted by the action of fly weights held between a stationary plate fixed to the shaft and a holder fixed to the movable pulley part. A cover is provided to cover the outer end of the movable pulley part, the stationary plate and an adjacent end of the shaft and cooperates with the stationary plate to define therebetween a first space which is communicated through a port in the stationary plate with a second space defined between the stationary plate and the holder. The first space is also communicated with the atmosphere through an axial bore extending axially through the shaft. A third space defined between the stationary and movable pulley parts is communicated with the axial bore through a second communication port formed radially in the shaft, whereby the three spaces are maintained substantially at the atmospheric pressure regardless of changes of the volumes of the spaces due to axial movements of the axially movable members, so that the torque transmission system can be free from any adverse effect which would otherwise be caused by the compression of air in the mentioned spaces.

Weight lifting exercising apparatus having a movable carriage

Abstract: A weight lifting body exercising apparatus comprised of a base member and one or more beams forming an upstanding frame. A vertically shiftable movement against one or more weights which may be selectively introduced. The user of the apparatus effectively lifts the weight or weights by pulling on a cable connected to the weight or weights. In some cases, the user effectively lifts the weights by pulling on the cable and moving the carriage. A first pulley is mounted on the frame above the carriage and at a height generally above the height of the user. A second pulley is mounted at the base and is located forwardly of the first pulley. A third pulley is mounted on the frame at a height generally above the height of the user and located immediately vertically above the user. In one preferred embodiment of the invention, a fourth pulley is located on the carriage. The cable may be secured to the carriage or trained around the fourth pulley on the carriage. A handle mechanism, and preferably an adjustable handle mechanism, is associated with the carriage and engagable by a user to apply a force and thereby attempt to shift the carriage against the one or more weights.

Emergency shut-off switch and frame assemblies for exercise apparatus

Abstract: An emergency shut-off switch assembly and a frame assembly for use with a treadmill-type exercise apparatus. The switch assembly includes handles connected to an upper portion of a housing assembly of the exercise apparatus. Independent shut-off switches for substantially instantaneously de-energizing a motor of the apparatus are closely spaced from lower ends of each of the handles in such manner that a downward force greater than a predetermined amount on either of the handles actuates its associated switch. Actuation of the switch results in substantially instantaneous stopping of the belt of the apparatus. The frame assembly includes supports for adjustably connecting ends of an axle of an idler pulley to the frame assembly so that the angular orientation of the axle with respect to the frame assembly is adjustable and pulleys are easily removed or replaced. Also, one end of a driven pulley of the apparatus is adjustably connected to the frame assembly. Further, a motor used to drive the driven pulley is mounted to the frame assembly in such manner that the motor is translatable with respect to the frame assembly to rapidly and precisely adjust tension in a belt interconnecting the motor with the driven pulley.

Expandable legrest for dental chairs

Abstract: A legrest for a dental chair has a telescopically nested section. A cable and pulley system automatically extends the nested section from the legrest as the legrest is moved from a generally vertical position to a generally horizontal position. Bias springs return the section to its nested position as the legrest moves back towards its near vertical position.

Wire guiding device

Abstract: A wire pulling device has a pulley wheel rotatably mounted to a clamp in the first embodiment of the invention, with the clamp being affixed to a junction box having an open side in a horizontal plane for the passage of the wire to the pulley wheel. In a second embodiment of the invention, two clamps are provided that mount the pulley wheel to the junction box where the open side of the junction box is in a vertical plane. The clamps have rotatable sleeves mounting a tie rod supporting the pulley wheel so that the sleeves may be rotated through 90 degrees when desired to change from the mode of operation of the first embodiment to that of the second, as when it is required when remounting the junction box from a ceiling to a wall.

Washing and spin drying machine, the drum being driven by an immersed belt

Abstract: 1. A laundry washing and drying machine, comprising a tub (1), which is arranged to contain washing or rinsing water and inside which a laundry drum (4) is mounted for rotation, which drum has a substantially horizontal axis (AA) and is supported by at least one shaft (5), which is mounted in a bearing seated in the tub wall, an electric motor (7) which is secured to the tub and which drives the drum via a belt (11) which is tensioned between a motor pulley (10) and a driven pulley which is rigidly connected to the drum, the motor pulley, the driven pulley, and the belt being situated within the tub and being at least partly immersed in the washing or rinsing water, the tub being situated in a housing (3) to which it connected by a damped resilient suspension, the motor pulley (10) being mounted on the motor drive shaft (8), which shaft extends through the wall of the tub at a point which is situated between the motor and the pulley, the motor drive shaft being aligned substantially parallel to the drum axis (AA), characterized in that the driven pulley is arranged on the cylindrical surface (6) of the drum (4), the motor being mounted so that the centre of gravity (G) of the washing assembly constituted by the drum, its pulley, the tub and the motor is situated substantially in the plane of symmetry (P) perpendicular to the drum axis.

X-Ray drive apparatus

Abstract: An X-ray apparatus has a moveable support on which are slidingly mounted an X-ray tube, an image intensifier and a film holder, these radiation components defining a common radiation axis. By including a reversible motor connected to a system of clutch operated drive linkages the X-ray tube and receptors can be selectively and reciprocally moved along the radiation axis in either an independent or interdependent manner so as to preserve a radiologically desirable Source to Image Distance (SID) while simultaneously accommodating other X-ray examination requirements such as patient comfort, safety, and desired examining position. The X-ray tube is attached to a lever arm and the image intensifier and film holder are each moved by respective cables travelling around respective drive pulleys and idler pulleys. Both the X-ray tube and receptors are closely counterbalanced by counterweights respectively moved by the cables. When the drive motor is appropriately engaged, a connecting shaft, belt or sprocket chain transmits the motor's force selectively through intermediate, force limited, slip clutches to the appropriate X-ray components. BACKGROUND OF THE INVENTION

Cone-pulley belt-type transmission

Abstract: In an infinitely variable cone pulley transmission having a driving shaft connected to a source of driving power, a driven shaft, a pair of conical discs nonrotatably mounted on each shaft with at least one disc of each pair being axially displaceable on its associated shaft, an endless transmission element adapted to run between the two pairs of discs for transmitting power between the shafts, a cylinder-piston unit associated with one axially displaceable disc on each pair for urging that disc toward the other disc of the same pair with a force proportional to the pressure of fluid in the unit, a distributing valve arranged to be arbitrarily adjusted to vary the speed ratio of the transmission, and connected to a pressure fluid source and to each unit for supplying pressure fluid thereto, and a normally-closed control valve connected in fluid flow communication with the distributing valve for controlling the fluid pressure in the unit associated with the driven shaft, the closing force presented by the control valve is controlled by an electromagnetic actuator having an energizing winding and connected to cause the closing force presented by the control valve to be proportional to the current through the winding, and an element connected to supply the winding with a current proportional to the torque being transmitted by the transmission, whereby the closing force presented by the control valve to fluid in the unit associated with the driven shaft is proportional to the torque.

Control means for motion compensation devices

Abstract: A control system for stabilizing a body suspended by a flexible line from a structure such as a ship, which is subject to uncontrolled oscillating movements, such as may be caused by wave motion, incorporates a winch (3) to which the line is attached, a pulley (4) over which the line (2) passes and from which the body is suspended, and a loop in the line between the winch and pulley, an accelerometer (28) being located adjacent the pulley, and the length of the loop being altered in controlled response to a stabilizing signal formed by combining signals derived from the accelerometer, and from the measured amplitude of oscillations of the loop length, and modified by a compensating signal to compensate for the effect of friction in the system.

Chain guide for a derailleur for a bicycle

Abstract: A chain guide for a derailleur for a bicycle, which switches a driving chain to one of multi-stage sprockets and has pulleys meshing with the chain and guiding it to a desired one of the multi-stage sprockets, the pulleys each being divided into a pulley toothed member having a number of teeth and a pulley body having a shaft bore, the pulley body being formed of an elastic material.

Automotive drive system with continuously variable transmission

Abstract: An automotive drive system is disclosed including a continuously variable drive system including input and output pulleys and a belt intercoupling the pulleys, a hydrodynamic device, a forward-reverse gear set, a reduction gear set and a differential assembly where the elements are mounted along two axes. The hydrodynamic device, forward-reverse gear set and the input pulley of the continuously variable drive system are mounted along the first axis. The output pulley, the reduction gear set and the differential assembly are mounted along the second axis which is coaxial with the longitudinal axis of the axle shafts. The reduction gear set includes both a high-speed and a high-torque gear train, and the high-torque gear train is an integral element of the final drive differential. The hydrodynamic device includes a lock-up clutch for direct drive through the hydrodynamic device at operating road speeds.

Pulley for compound archery bow

Abstract: An archer's compound shooting bow has rigging cables and pulleys arranged to eliminate torque on the limbs when the bow is fully drawn and to permit an arrow to fly true past the rigging when the bow approaches its rest condition. Each pulley has two grooves receiving an adjacent rigging cable. The grooves have variable separation at different locations along the pulley rim. Each pulley is mounted on a limb alongside the opposite rigging cable dead end. As to each limb, the connection of the opposite cable dead end and the location of the adjacent cable tensions are arranged, in respect to their magnitudes at full draw, to apply no net torsional moment to the limb about its torsional axis. The separation between the pulley grooves corresponding to the rest condition permits arrow feathers to pass the rigging cables without contact, which is not true at full draw. The groove for the shooting string is normal to the pulley rotational axis. The other groove is substantially helical to the first groove. The pulley is ring-shaped and is fabricated from an extrusion having an annular cross section.

Method of making toothed belt

Abstract: A reinforced elastomeric drive belt 20 having tooth-like protuberances 21 for meshing with the teeth of a pulley is provided with reinforcing fibers 27 distributed through at least a portion of each tooth 21. Also provided is a method for building the improved belt and an improved apparatus for building such a belts.

Method and apparatus for controlling tension in a moving material

Abstract: Method and apparatus for controlling tension in a longitudinally moving web between fixed material feeding points while maintaining the length of the path of web movement between said fixed points substantially constant. Two axially fixed, web-feeding rollers are positively driven from a common drive motor. One roller is driven at a variable speed through a shaft-mounted transmission unit having a variable pitch pulley spaced from the axis of rotation of the roller shaft and connected to the motor by a flexible belt. Fluid piston means provides a constant force on the transmission unit in a direction about the roller shaft axis to impose a constant torque on the variable speed roller and to move the variable pitch pulley to increase or decrease the speed of the roller, thereby maintaining a constant imposed tension on the material in its path of movement between the two rollers. In a further embodiment, web tension variations upstream of the two feed rollers is controlled by an upstream displaceable roller which moves in response to upstream tension variations in the web to move the transmission unit about the feed roller shaft axis and vary the speed of the feed roller to maintain a substantially constant total tension on the web in its path of movement between the two feed rollers.

Belt guiding device

Abstract: A device for guiding a belt during mounting on a pulley. A body of the device has a slot for receiving an edge portion of the pulley and a face portion adjacent the slot and substantially parallel with the slot for receiving and supporting the belt. The device is attached to the pulley and holds the belt as the pulley is turned and guides the belt into the pulley.

Rope speed limited abseiling mechanism - has single overhung pulley outside housing and driving gear for centrifugal brake

Abstract: The mechanism lowers persons or loads by the rope travelling through it, the rope being reeved round a fixed part of the periphery of a pulley so that it cannot slip. When a rope end is pulled, a centrifugal brake limits the rope travel speed, this brake being driven via a speed-increasing gear with an input shaft in bearings in one of the housing walls. The pulley and the driving gear wheel are mounted on this shaft. Only one pulley (38) is provided, on the outside of the housing and overhung. The driving gear (20) is on the opposite side of the housing wall (33) to the pulley.

Position control mechanism for a variable drive ratio pulley system

Abstract: A variable drive ratio pulley system has longitudinally adjustable pulley halves operated by fluid pressure which acts on piston and cylinder structures operatively connected with the adjustable pulley halves. The fluid pressure in one of the piston and cylinder structures is controlled by a valve spool responsive to an actuator on which a lever member is pivotally disposed and maintained in abutment with the drive surface on the adjustable pulley half. The lever member also abuts a control rod which is linearly movable in response to command signals. Linear movement of the control rod initiates pivoting of the lever member and enforces or permits resultant linear movement of the actuator so that the spool valve is operated to change the pressure level operating on the piston thereby permitting movement of the pulley half resulting in a change of the drive ratio. The pulley also enforces pivoting of the lever and attendant linear movement of the actuator which causes the spool valve to return to its neutral position when the pulley half has attained the position demanded by the control rod.

Weight lifter's belt incorporating pulley mechanism

Abstract: A waist belt for weight lifting incorporates a pulley arrangement for tightening the belt. The waist belt includes a heavy leather belt having first and second ends. First and second rectangular metal loops are secured proximate the first and second ends, respectively, of the leather belt, each of the rectangular metal loops including a cylindrical roller rotatably mounted thereto. A nylon strap is secured at a fixed end to the leather belt proximate the second end thereof, and the free end of the strap is wound over the rollers of the first and second metal loops to form a pulley arrangement for drawing the ends of the leather belt together. First and second complementary fastening surfaces are secured to the free end of the strap and to the leather belt, respectively, for removably attaching the free end of the strap to the leather belt after the belt has been sufficiently tightened.

Centrifugal operating device

Abstract: A device for automatically changing the speed ratio between a drive shaft and a driven shaft, including a pair of pulleys mounted on the drive and driven shafts and each having two opposing flanges of truncated cone shape, the pulleys being linked by a V-belt and one pulley being loaded with centrifugally displaceable weights for the speed-change operation. One of the flanges of each pulley is provided with a cover plate having a flat surface portion perpendicular to the rotational axis in face-to-face relation with a truncated-conical surface of the flange. Centrifugally displaceable weights in the form of rollers are located in contact with and between the flat surface portion and the truncated-conical surface portion displaceably radially outward for the speed-change operation. Each roller is constituted by a pair of cylindrical members fixed in opposite end portions of a short shaft and a cylindrical rotary member rotatably mounted in the middle portion and having an outer diameter slightly greater than the cylindrical members. The roller is held in rolling contact with the truncated-conical surface portion of the flange at the opposite end portions and with the flat surface portion of the cover plate in the middle portion to preclude sliding resistance.

Remote three axis cable transport system

Abstract: An apparatus for accurately positioning an object such as a radiation probe within a defined three dimensional space has a pair of support bars extending along each of three perpendicular axes defining said space with bearing block supports slidably mounted along each set of support rods. A cable drive for each direction of movement is provided to move these bearing blocks including a drive motor, a drum assembly including a capstan and cable guide, a drive cable, and a plurality of pulleys spaced along the system to achieve a balanced movement of the system in the associated direction. The cable is aligned so that each section of its run is either perpendicular or parallel to its other sections and is arranged with the capstan and cable guide so that there is an increase of tension as the cable is reeled in and a decrease of tension as the cable is payed out to reduce the stretching of the cable as the apparatus is operated.

Material conveying apparatus

Abstract: A livestock feeding apparatus having an endless belt supported on an elongated table above a feed bunk by a plurality of stands. The stands are laterally and vertically adjustable to level the apparatus and accommodate different sized bunks. The belt has an upper run that rides on a wood deck secured to the support. An idler pulley and drive pulley engages one end of the belt opposite ends. The belt is retained in driving engagement with the drive pulley by a driven roller engageable with the lower run of the belt adjacent the drive pulley. A motor drives the roller at a speed so that the surface speed of the roller is greater than the linear speed of the belt to maintain the lower portion of the run of the belt between the roller and the drive pulley under tension. A sweep assembly slidably mounted on the wood deck operates to move the material off of the side of the top run of the belt into the bunk. The sweep assembly has a roller located in driving engagement with the upper run of the belt and an angularly located drum. Coacting drive members drivably connect the roller with the drum so that on rotation of the roller the drum is rotated to move material off the side of the belt. A reversible motor drivably connected with a cable to the sweep assembly operates to reciprocate the sweep assembly between opposite ends of the support. A belt tightening assembly associated with the pulleys maintains the belt under tension. The belt tensioning assembly includes biasing springs and a linear actuator that adjusts the biasing force on the springs to maintain tension on the belt. A diverter assembly attached to the sweep assembly has a pivotally mounted chute movable to opposite inclined positions to selectively direct the material to opposite sides of the feed bunk.

Fiber feeder pulley cleaning system

Abstract: This invention relates to a feeder 10 for glass fibers useful in feeding glass fibers to a wet-mat process. Previous fiber feeders were unreliable and caused process disruptions primarily due to fiber conveying belt breakage. Belt breakage in the present fiber feeder is substantially eliminated by providing a belt pulley comprising an open-ended cylindrical drum 52 having a plurality of staggered waste fiber intake openings 54 longitudinally and circumferentially distributed over the drum. The intake openings 54 are staggered and sized to eliminate interference with the motion of slats 60 which comprise the fiber conveying belt 50, to ensure sufficient flow of waste fiber 36' out of the drum 52 and to eliminate any potential accumulation of waste fiber 36' between the belt 50 and the belt pulley 48.

Tilt and lift mechanism for venetian blind

Abstract: A venetian blind slat-tilting mechanism including a pair of top-mounted bars to which tilt strings are attached at opposed positions and which are attached together through a nut threaded to a rod. The rod is connected to a pulley which is turned by a tilt-adjusting cord. The motion of the pulley turns the rod and moves the nut laterally, thus moving both bars and tilting the blind's slats. Additionally a slat-lifting mechanism is provided in the form of lift strings running over support pulleys to raise and lower the blind.