Showing papers on "Pulley published in 1993"

Improved actuating handle with pulley system for providing mechanical advantage to a surgical working element

Abstract: A medical device has a body, an actuating member mounted to move relative to the body, a working element, and an elongated force-transmitting member capable of transmitting actuating force between the actuating member and the working element. The force-transmitting member includes a flexible cable portion, the force-transmitting member is attached, on one side of the cable portion, to the body and associated in a driving relationship on the opposite side of the cable portion with the working element. According to the invention the actuating member includes a pulley surface bodily movable therewith, the cable portion is trained about the pulley surface such that movement of the actuating member a given distance, relative to the body, causes the working element to move a substantially greater distance than the given distance. Another aspect of the invention is a medical snare with the above features.

Electromechanical back brace apparatus

Abstract: A back brace apparatus disclosed which has electromechanical means for tightening a brace around the trunk of a patient to a desired tension. The electromechanical means is controllable by the patient to effect predetermined tension settings. A cable and pulley arrangement tightened by a motor provides a mechanical advantage so that the brace may be tightened by a small motor. A microprocessor controls the motor to obtain the desired repeatable tension settings.

Measurement of friction between pulley and flexor tendon.

Abstract: When tendon excursion takes place through the pulley, friction and drag are encountered at the interface. Repetitive exposure to such friction and attrition of the tendon has been considered one of the important factors causing cumulative trauma and leading to disorders such as tendinitis and tenosynovitis. In this study, development of an experimental method to evaluate friction and drag between the pulley and tendon under different loading conditions and joint configurations is considered. Verification of the model under an ideal situation of sutures across a mechanical pulley was performed.

Sliding door closed loop cable closure system with balanced cable tension and varying diameter pulleys

Abstract: The van (10) has a sliding door (14) mounted on rollers (22, 24 and 30) that are supported by and slidable in tracks (16, 18 and 20). An opening and closing module (50) is mounted inside the van adjacent to the center track (18). A front cable (74) is attached to the front cable drive pulley (144), and extends from the pulley through a front cable roller guide assembly (54) and is attached to the hinge and roller assembly (26). A rear cable (100) is attached to the rear cable drive pulley (136) and extends from the pulley through a rear cable roller guide assembly (56) and is attached to the hinge and roller assembly (26). The front and rear cable drive pulleys (136 and 144) each have a large diameter spiral cable groove (164), a small diameter cable groove (208) and a transition cable groove 210. A motor (126) rotates the front and rear cable drive pulleys to move the sliding door. The small diameter cable grooves (208) drive the sliding door (14) when the door is in the forward portion of the tracks. The large diameter spiral cable grooves (164) drive the sliding door when the door is in the center and rear portions of the tracks. Fixed idler rollers (226 and 254) guide the front and rear cables (74 and 100) to and from the cable drive pulleys (136 and 144).

Design and experiments for a coupled tendon-driven manipulator

Abstract: The authors describe the operation of a tendon-driven manipulator, the CT ARM-I, which has a tendon traction force transmission mechanism in which the pair of tendons that drive a joint are pulled from base actuators via pulleys mounted on the base-side joints. The mechanism makes the most of the coupled drive function of the tendon traction forces and thus enables the lightweight manipulator to exhibit enormous payload capability. The manipulator has a solid structure and is inexpensive to manufacture because of its mechanical simplicity. Experiments demonstrate that the CT ARM-I has an active compliance arm and offers payload capability superior to that of conventional manipulators. >

Door opening cable system with cable slack take-up

Abstract: A van door slidable in tracks (16, 18 and 20). An operating module is mounted inside the van adjacent center track 18. A front cable attached to drive pulley (144) extends through guide assembly (54) to hinge and roller assemble (26). A rear cable attached to drive pulley (136) extends through guide assembly (56) to hinge and roller assembly (26). The drive pulleys (136 and 144) each have a large diameter spiral cable groove (164), a small diameter cable groove (208) and a transition cable groove (210). A motor rotates the drive pulleys. The small diameter cable grooves drive the door when the door is in the forward portion of the tracks. The large diameter spiral cable grooves drive the door when the door is in the center and rear portions of the track. Fixed idler rollers (226 and 254) are positioned relative to the cable drive pulleys to insure that the total cable in the continuous cable loop is substantially the same when the cable is driven by the small diameter cable grooves as when the cable is driven by the large diameter spiral cable grooves. A cable tension system (220) maintains cable tension. A slack cable take-up pulley (174) on the drive pulley (136) takes up slack cable to set cable tension and is then locked in position.

Three-point safety belt system for a motor vehicle

Abstract: A three-point safety belt system for a motor vehicle having an automatic belt retractor for the safety belt, a belt lock and a belt tightening device which, when a critical change in speed is exceeded, tightens the belt which, in order to alleviate the spring return force formed in the automatic belt retractor when the safety belt is on, provides a controlled counter torque for the winding shaft of the automatic belt retractor, the belt tightening device engaging on the belt lock to cause the belt to be tightened.

Treadle drive system with positive engagement clutch

Abstract: A treadle drive system operates comfortably in a standing or seated position with two toe or heel end pivoting treadles. A flexible drive line (chain, cable, belt, etc.) from each treadle drives a pair of forward biased driving rings (having sprockets, pulleys, belt wheels, etc.) concentrically encircling and driving a hollow drive cylinder. Concentrically encircling the cylinder, a driven ring in turn drives a rotating device. A positive engagement clutch between the hollow cylindrical hub and the driven ring allows the driven ring to be engaged or disengaged from the drive cylinder. Opposing holes transversely through the hollow drive cylinder engage pins on outer ends of a V-shaped spring. The pins are normally engaged in mating openings on an interior surface of the driven ring. A push-pull shaft with a cup having a rigid rim pushes against the sloping sides of the spring to disengage the pins from the driven shaft only. Pulling the shaft releases the spring reengaging the pins in the driven shaft. The treadle drive system may be positioned in any desired orientation to provide a human power source producing a variable rotary output for transportation, exercise, tools and instruments, generators, or any other application requiring a rotary motion.

Rotary disc planetary type surfacing machine

Abstract: The invention relates to an arrangement for a mobile surfacing machine, preferably for the surfacing of stone floors. A frame (1) supports a drive motor (2) with a motor shaft (2a). A planet disc (3) is rotatably mounted in the frame (1), with three surfacing discs (8a) arranged on shafts (8) rotatably mounted on the planet disc. The surfacing discs (8a) are in operative connection with a belt pulley (2a1) arranged on the drive shaft (2a) of the motor (2) via a drive belt (9) running around first belt pulleys (8b) arranged on the aforementioned shafts (8). The shafts (8) of the surfacing discs (8a) are so arranged, for the purpose of controlling the rotation of the planet disc (3), as to be in operative connection with the frame (1). The operative connection comprises, for example, a belt pulley (1a) attached to the frame (1), second belt pulleys (8b) arranged on the shafts (8) of the surfacing discs (8a), and a second belt (11) running around these and the belt pulley (1b) attached to the frame (1).

Combine harvester leveling system, combine harvester header adjusting system, and pivoting chain drive system

Abstract: A header adjusting system for a hillside combine harvester includes a master hydraulic cylinder assembly and a slave hydraulic cylinder assembly. The master hydraulic cylinder assembly is slaved to movement of the wheels relative to the combine frame. The slave hydraulic cylinder assembly is slaved to extension and retraction of the master hydraulic cylinder assembly. The slave hydraulic cylinder assembly causes the header to pivot about the longitudinal axis of the harvester in order to follow the contour of the ground. A header trimming mechanism is also provided to enable direct operator control of some of the pivoting action of the header about the longitudinal axis. A leveling system for a hillside combine harvester includes a cable and a biased, moveable reference pulley associated therewith. Movement of the reference pulley actuates a switch which selectively imparts fluid flow to hydraulic leveling cylinders to re-establish a reference position of such pulley, and correspondingly a reference orientation of such cylinders. A chain drive system for a hillside combine or other vehicle includes a first arm and second arm, at least one of which is mounted for pivotal movement relative to the other. An interconnecting chain drive sprocket assembly is independently rotatably supported relative to the pivot connection between the first and second arms. Such assembly includes interconnected chain drive sprockets for transferring chain drive from one arm to the other through the pivot connection.

Weight lifting machine

Abstract: A weight lifting machine for performing a wide range of exercises, has a lift bar angularly adjustable for a starting lift position angularly upward or downward of a substantially horizontal position. An actuating bar is connected to the lift bar for movement therewith. First and second pulleys are movably mounted above and below the actuating bar such that the first pulley moves upwardly with the actuating bar and the second pulley moves downwardly with the actuating bar. The first pulley is prevented from moving downwardly when the second pulley is moved downwardly with the actuating bar and the second pulley is likewise prevented from moving upwardly when the first pulley is moved upwardly. A lift cable is threaded through the first and second pulleys such that movement of the lift bar in either direction lengthens the distance between the pulleys, thereby lifting a plate-type weight stack. The machine is also equipped with butterfly bars and a leg extension, with the lift bar, butterfly bars and leg extension all connected to the weight stack through a single lift cable.

Supercharging device for an internal combustion engine

Abstract: A supercharging device (11) for an internal combustion engine includes a runner (4) for compressing air, a driven pulley (22) for rotating the runner (4), and a drive pulley (34) for rotating the driven pulley (22). The drive pulley (34) has a fixed sheave (37) and a movable sheave (38) movable in an axial direction with respect to the fixed sheave (37). A belt (28) is wound around the driven pulley (22) and the drive pulley (34). A control device is moving the movable sheave (38) in an axial direction so that the movable sheave (38) is moved away from the fixed sheave (37) under a low load condition and that said movable sheave (38) is moved towards the fixed sheave (37) under a high load condition.

Substrate processing device

Abstract: PURPOSE:To provide a substrate processing device, where a substrate and a circuit pattern formed out its surface are protected against damage or a substrate is prevented from getting out of position when the substrate on a mounting table is lifted up with a substrate support pin, and a heating process can be improved in flexibility. CONSTITUTION:Through-holes 5 are provided to a hot plate 4, and a substrate support pin 6 is arranged in each through-hole 5. The lower end of the substrate support pin 6 is fixed to a connecting guide 7, and the connecting guide 7 is joined to a belt 8. The belt 8 is wound on a pulley 10 fitted to a stepping motor 9 and a pulley 11 located above the pulley 10, and the substrate support pins 6 are made to move up or down in accordance with the rotation of the stepping motor 9. The stepping motor 9 is controlled by a control device 12 to start, stop, or be regulated in rotary speed.

Mechanism of a stepping device

Abstract: A improved mechanism of a stepping device includes a pedal mechanism constructed by a parallelogram which facilitates the pedal remains at a horizontal position at all levels. A trasnaxle is rotated as the pedal is stepped down and a gear and an actuating gear are used to connect a load adjusting device. Then a predetermined load can be applied to the pedal as it moves down. A one-way bearing is disposed inside the bushing of the transaxle, hence the pulley disposed thereof can rotate bi-directionally. A pulling rope and a spring are used to pull up the pedal which moves to a lower dead point. While the inertia of the gear and actuating wheel will make it moves continuously. By this arrangement, a smooth and continuous stepping device is provided.

Safety descender for a rope

Abstract: The descender comprises a first flange for support of a pulley and a pad, and an auxiliary braking lever mounted with limited pivoting near the pulley between an inactive unlocking position for a first winding direction of the rope in the passage space, and an active locking position in which a jamming surface of the lever presses the rope against the pulley Pivoting of the lever to the active position takes place automatically in case of incorrect winding of the rope according to a second direction opposite to the first direction, and in the presence of a tension on the rope when the descender is on load

Sliding door opening cable system with cable slack take-up

Abstract: A van door slidable in tracks (16, 18 and 20). An operating module is mounted inside the van adjacent center track 18. A front cable attached to drive pulley (144) extends through guide assembly (54) to hinge and roller assemble (26). A rear cable attached to drive pulley (136) extends through guide assembly (56) to hinge and roller assembly (26). The drive pulleys (136 and 144) each have a large diameter spiral cable groove (164), a small diameter cable groove (208) and a transition cable groove (210). A motor rotates the drive pulleys. The small diameter cable grooves drive the door when the door is in the forward portion of the tracks. The large diameter spiral cable grooves drive the door when the door is in the center and rear portions of the track. Fixed idler rollers (226 and 254) are positioned relative to the cable drive pulleys to insure that the total cable in the continuous cable loop is substantially the same when the cable is driven by the small diameter cable grooves as when the cable is driven by the large diameter spiral cable grooves. A cable tension system (220) maintains cable tension. A slack cable take-up pulley (174) on the drive pulley (136) is locked in position by teeth (194) thereon and arcuate tooth rack (172) which move into engagement by rotation of the drive pulley (144) relative to drive pulley (136).

Belt retractor with a belt pretensioner acting on the belt drum

Abstract: The belt retractor with a belt pretensioner acting on the belt drum (12) has a pyrotechnical piston and cylinder linear drive (22). A rack (32) adapted to be subjected to thrust is connected with the piston (28) of such linear drive (22). The rack (32) is able to be drivingly coupled with the belt drum by the intermediary of a step-up gear wheel transmission (34, 36, 44). After tensioning of the belt, tensions in the safety belt system are limited by plastic deformation of a torsion rod (38), and peak strain values are decreased. The belt retractor is integrated with the belt pretensioner and the energy converter as a compact assembly.

Variable ratio drive pulley

Abstract: In order to provide for advantageous adjustment possibilities for an infinitely variable drive pulley for a belt drive transmission with two flanges arranged on a shaft and which accommodate a V-belt. One flange is fixed axially on the shaft and the other is moveable in the axial direction against the force of at least one return spring by centrifugal weights in the form of adjusting levers. The adjusting levers each acts on an abutment cam surface, and is supported so as to be able to pivot out about a pin that extends transversely to the shaft, spaced radially therefrom. The adjusting levers can be moved relative to their pivot pins through an adjustment eccentric.

Cervical traction device

Abstract: An apparatus for applying cervical traction to a user (22) with a head halter (24) is disclosed. The apparatus includes a frame (24), a tensioner assembly (34), a cord (42), and a pulley (44). The frame has a generally straight section (28), a curved section (32), and a shoulder brace (30). The straight section has a head portion (68) extending behind the head of the user and a tail portion (70) extending behind at least a portion of the back of the user. The shoulder brace is coupled to the straight section at the end of the head portion opposite the connection to the curved section and is oriented generally transverse to the longitudinal axis of the straight section. The curved section generally forms a C-shape. The C-shape of the curved section opens toward the head of the user. The tensioner assembly is coupled to the end of the curved section opposite the attachment to the straight section. The tensioner assembly is also coupled to the halter through the cord. The tensioner assembly includes a rotatable axle (38), a handle (36) attached to the axle, and a ratchet mechanism (40) coupled to the axle for holding the axle at a desired location. The cord is coupled between the axle and the halter. The pulley is attached to the curved section of the frame, the cord extending through the pulley between the halter and the tensioner assembly. A device for measuring the tension in the cord is also disclosed. The measuring device (48) is coupled to the cord and has an indicator to signal when the tension in the cord reaches a predetermined amount.

Wheelchair with belt transmission

Abstract: A wheelchair has a seat portion and a pair of stationary mounting plates fixed to two sides of the seat portion. Each of the mounting plates has a driven pulley rotatably mounted thereon and a driving unit with a driving pulley. An endless belt interconnects the driving and driven pulleys together. A clutch assembly is mounted on the mounting plate and is associated with the driving unit to engage and disengage the driving unit from a pair of wheels that are attached to the stationary mounting plates.

Suspended moving target system

Abstract: A portable motorized system of pulleys and cable which moves a three dimensional, or conventional target around a predetermined path. The purpose of this system is to simulate, through movement, the actions of an animal during hunting conditions. This system allows the user, to shoot at a target which moves and changes directions, while standing in one place. The system is suspended by attaching screwhooks into fixed objects such as trees, poles, buildings etc. A motor assembly which is attached to one of the supports turns a drive pulley. The cable and target are moved through a series of idler pulleys, by the drive pulley, around a closed circuit. A hand operated ratchet is utilized at another support location to apply tension to the system. The tension causes the system to be fully suspended from the supports. The motor is powered by a twelve volt battery, a switch and fuse are also incorporated. In addition a power interrupter switch, or kill switch, may be introduced between the power supply and the system switch allowing the user to operate the system from the firing line. This system is intended to be used indoors or outdoors and may be set up on an outdoor walk through target range.

Electromagnetically operated friction disc coupling esp. for driving fan wheel in IC engine - rotates wheel with direct rpm of driving pulley across first electromagnetic friction disc coupling and with two different windmilling rpms

Abstract: The fan wheel (2) with non connected friction disc coupling can be driven across a second friction disc coupling at a low windmilling rpm. The rotor (8) at its radial outer annular wall or hollow shaft (9) has a belt drive pulley (5) for a drive. A further eddy current coupling (35) is provided between the fan wheel or similar, and the rotor (8) with the belt pulley, for the prodn. of a further windmilling rpm. The rotor (8) is located on a stationary shaft (34) across a ball bearing (33). ADVANTAGE - Requires higher engineering cost compared to known unit. Facilitates reliable and adjustable windmilling speed independent of friction of ball bearing and follower effect on rotor of eddy current coupling.

Continuous V-belt transmission

Abstract: A continuous V-belt transmission comprising: a primary pulley and a secondary pulley individually including two sheaves supported on shafts and made axially movable relative to each other; a belt made to run on the two pulleys; mechanical actuators individually including first members and second members for moving the movable sheaves of the two pulleys on the basis of the relative rotations of the two members: and pressure regulating mechanisms for applying an axial force corresponding to a transmission torque to at least one of the pulleys. In an unshifted state, the rotations of the pulleys are transmitted from the externally threaded portions integrated with the movable sheaves to the carriers of the planetary gear mechanisms so that they are transmitted through the ring gears to toe internally threaded portions on the basis of the sun gears being stopped. At this time, the externally threaded portions and the internally threaded portions are rotated integrally with the pulleys at the same r.p.m. If the sun gears are rotated through the shafts by the shift motor, the externally threaded portions and the internally threaded portions are rotated relative to each other to effect the shifting operation. At this time, the stroke of a ball screw unit is caused to match the stroke of the movable sheaves by non-circular gears.

Motorized pulley with internal mounts

Abstract: A drive pulley assembly (16) is disclosed for a conveyor belt assembly (10) which permits a reduction in the overall size of the conveyor assembly (10) without any reduction in the size or width of the conveyor belt (20). The overall width of the conveyor assembly (10) is reduced by providing recessed end cavities (26, 28) in the ends of the drive pulley (16) to accommodate the mounting brackets (104) for the pulley. In accordance with the present invention, the mounting brackets (104) are secured to the inside of respective frame members (12) and extend therefrom into the recessed end cavities (26, 28) of the drive pulley (16) such that substantially the entirety of the mounting bracket (104) lies within the drive pulley (16). Because the mounting brackets (104) are contained substantially within the confines of the drive pulley (16), the drive pulley assembly (16) of the present invention requires less space than conventional conveyor assemblies in which the mounts are disposed beyond the ends of the drive pulley (16).

Compound bow and yoke adjuster

Abstract: An improvement is provided for a compound bow having upper and lower limbs, upper and lower draw pulleys mounted respectively on free outer ends of the upper and lower limbs, a cable system reeved about the pulleys, and a yoke assembly for mounting an end of the cable to the free outer end. The improvement comprises the yoke assembly having a body with two outer mounting fixtures and the cable mounted to the body. Two cable segments affix the limb free outer end on opposite sides of the pulley and to the mounting fixtures. An adjusting mechanism associated with each mounting fixture allows the tension in each cable segment to be separately adjusted.

Centerless gaging apparatus for checking the concentricity and straightness of shank-type tools and the like

Abstract: A cylindrical portion of the tool or workpiece is rotatably supported by two pairs of spherical rollers rotatably carried by two pairs of holders mounted on first and second upright supports secured to a bed. The second support is adjustable to change the spacing between the supports. The holders have screw threads for adjusting the spacing between the rollers. Alternatively, separate feed screws are provided for the holders. A drive belt is looped around the workpiece and around a drive pulley rotatably mounted on a movable carriage biased by a spring to tighten the belt. A knob is provided to rotate the drive pulley. The flights of the belt are pinched toward each other by a pair of guide pulleys and by a pair of rollers adjacent the drive pulley, whereby the upper loop of the belt is kept open and close to the location of the workpiece when it is removed. The carriage may be latched in a belt-loosening position by a swingable latching arm. Optionally, the workpiece may be rotatably supported by two pairs of blades having inclined edges in a V-shaped formation. The blades have smoothly rounded edges for engaging the workpiece with point contacts.

Cable winding device

Abstract: PURPOSE:To provide smooth winding and unwinding of a cable regardless of the operating condition of a traveling element by keeping the tension of the cable at a very small tension and adjusting the tension at the time of winding and unwinding the cable as necessary. CONSTITUTION:This winding device is provided with a one-way rotational resistance pulley 23 which rotates in a close contact condition to a cable, a one-way clutch, a torque damper 26, a cable close contact pulley, guide pulleys 30, 31, 34, 35, 38, and a motor controller which controls the rotational direction/ speed of a cable drum 14 so that cable tension may be prescribed very small tension, whereas the one-way clutch is kept in a free condition at the time of unwinding. This device is also provided with a control means which connects the shaft of the one-way rotational resistance pulley 23 with the torque damper 26 with the one-way clutch kept in a locked condition at the time of winding the cable and so on.

Variable speed drive system

Abstract: A variable speed drive system for use with a self-propelled device is coupled by a belt to an engine which is mounted to the device. The variable speed drive system includes a variable pitch pulley held in spaced-apart relation to the drive shaft by a fixture and rotates about the drive shaft between a first position proximal to the engine and a second position distal to the engine. In the first position, the drive system is disengaged from the engine and the speed of the self-propelled device is zero, the belt being slack and providing no drive force to the drive system. In the second position, the drive system is moved a maximum amount about the drive shaft and is positioned to achieve a maximum speed. The drive system can also assume any intermediate position between the first and second positions, with the speed of the self-propelled device being determined by the amount of movement about the drive shaft toward the second position. A speed control lever and a control cable assembly are included for limiting the amount of movement of the drive system about the drive shaft to control the speed of the self-propelled device