Abstract: Integrated climb assist and fall arrest system and methods to assist users climbing ladders and vertical paths are disclosed. The integrated systems and comprise a controller connected to a user's harness, a static fall arrest cable, and a movable climb assist belt. The connection of the fall arrest components and the climb assist components may include physical connection, electronic connection, communication, or any combination thereof. The climb assist belt can be driven by a motor to provide an upwards climb assistance force to a user along a vertical path. The motor can be dynamically adjusted to continuously provide a level of climb assistance. The integrated controller is also configured to mechanically detect downwards movement and engage an overspeed braking mechanism when a threshold velocity or acceleration is detected.

Abstract: A pulley for guiding a belt for carrying a car and/or a counterweight of an elevator system has a plurality of peripheral, axially spaced channels for receiving ribs of the belt. Each of the channels has two opposing channel flanks for force transmission by frictional engagement with one of the ribs and a peripheral groove between the two channel flanks. A width of the groove is at least 25 percent of an axial spacing of the channels and at least 80 percent of a height of the channels.

Abstract: A cleaner capable of adjusting tension of a belt to connect or disconnect power between a motor and a wheel in the cleaner including the belt transmitting a driving force of the motor to the wheel is provided. A cleaner according to the present disclosure includes a cleaner body, a wheel which movably supports the cleaner body with respect to a floor, a traveling drive motor which is disposed in the cleaner body, a first pulley which is rotated by a driving force of the traveling drive motor, a second pulley which is rotated when the first pulley rotates and rotates the wheel, a belt which connects the first pulley and the second pulley, and a clutch which adjusts tension of the belt to connect or disconnect power between the first pulley and the second pulley.

Abstract: A draper belt for a head of a harvester that is to extend about a roller having an outer groove encircling the roller and may include a web and an elastomeric belt guide. The web may have a first surface to carry crop material and a second surface to face the roller. The elastomeric belt guide may extend from the second surface and may include downwardly projecting teeth.

Abstract: A recumbent cycle includes a toothed belt drive system and rear suspension. It also includes a double A-arm suspension assembly and at least one transmission having a planetary gear arrangement.

Abstract: A fastener device and method for securing and releasing sheet material. Specifically, the present disclosure relates to a fastener device useful for securing a sheet material to an object, item or the ground, without the need for perforations, holes, eyelets or grommets in the material. The fastener device is easily attached to and removed from sheet material without damaging the material. Additionally, the fastener device is adapted for receiving a coupling or anchoring member for further securing the sheet material to another object or even the ground creating a protective cover or temporary shelter.

Abstract: The invention relates to an elevator comprising a hoistway; an elevator car vertically movable in the hoistway; a plurality of ropes connected to the car; a rotatable traction member comprising a circumferential traction surface area for each of the several ropes; each rope being arranged to pass around the rotatable traction member resting against a circumferential traction surface area of the traction member; drive machinery for controlling rotation of the rotatable traction member. The elevator comprises means for detecting displacement of each of the ropes over a first limit position of the rope in the first axial direction of the rotatable traction member, and over a second limit position of the rope in the second axial direction of the traction member; and in that displacement of one or more of said ropes in axial direction of the rotatable traction member over the first or second limit position is arranged to trigger the drive machinery to stop the rotation of the rotatable traction member.

Abstract: An elevator includes first and second elevator units vertically movable in a hoistway and interconnected by at least one belt-shaped hoisting rope. Each of the belt-shaped hoisting ropes is moved and passes around a drive wheel and includes consecutively a first rope section extending between the drive wheel and the first elevator unit, and a second rope section extending between the drive wheel and the second elevator unit. The elevator further includes non-driven cambered diverting wheels, each said first and second rope section being arranged to pass around and rest against a cambered circumferential surface area thereof. A monitoring arrangement monitors displacement of the first and second rope sections of the wheels in the axial direction. When one or more of the first and second rope sections is displaced in the axial direction of the wheels away from a predefined zone, rotation of the drive wheel is stopped.

Abstract: A notched transmission belt has a plurality of notches whose bottom in a cross-section taken along a plane orthogonal to the width direction of the belt includes a linear portion at a center, and recessed curved portions continuously formed at both sides of the linear portion.

Abstract: A metal belt (300) is an endless belt formed of a strip body. The metal belt (300) includes a belt overlapping portion in which at least two ring pieces (310a, 320a) formed by deformation due to a compressive stress inherent in the belt doubly overlap in a ring radial direction in a natural state where no external force is applied. Further, the metal belt (300) has a cross-sectional shape convex radially outwardly in a cross-section perpendicular to a circumferential direction of the belt in a state reached by annularly spreading the belt in the natural state.

Abstract: A recumbent cycle includes a toothed belt drive system and rear suspension. It also includes a double A-arm suspension assembly and at least one transmission having a planetary gear arrangement.

Abstract: [Purpose] A belt drive system, in which a drive belt 20 is wrapped between a drive pulley 1 drivingly connected to a drive source 11 and a driven pulley 2 connected to an driven unit 12 via a joint 32 provided to stop torque transmission when receiving a load equal to or over a predetermined value and torque is transmitted via the drive belt 20 from the drive pulley 1 to the driven pulley 2, ensures that when the driven unit 12 malfunctions, the joint 32 stops the torque transmission without unnecessarily increasing the coefficient of friction against the driven pulley 2 or the belt tension. [Solution] The belt drive system is configured so that when a slip corresponding to the load on the joint 32 equal to or over the predetermined value occurs between the drive belt 20 and the driven pulley 2, the coefficient of friction between the drive belt 20 and the driven pulley 2 becomes higher than that before the slip occurs.

Abstract: An omni-wheel based driving mechanism includes a spherical wheel, a pair of first omni wheels, and a pair of second omni wheels. The first omni wheels are arranged at two sides of the spherical wheel to space from each other by a predetermined distance in a first direction, so that the spherical wheel is rollably positioned between the first omni wheels. The second omni wheels are arranged at another two sides of the spherical wheel to space from each other by a predetermined distance in a second direction, so that the spherical wheel is rollably positioned between the second omni wheels. Therefore, a good driving efficiency can be obtained between the spherical wheel and the first omni wheels and the second omni wheels.

Abstract: A power transmitting system that is configured to have BAS and IS functionality. The power transmitting system can be operated in a first mode in which an engine provides rotary power for driving an accessory assembly and a motor/generator. The device can be operated in a second mode for starting the engine and driving the accessory in which rotary power is output from the motor/starter in a first rotational direction. The device can also be operated in a third mode in which the motor/generator outputs rotary power in a second, opposite rotational direction for driving the accessory while the engine is not operating. A kit for a power transmitting system is also provided.

Abstract: An electric motor driven barrier operator includes spaced apart frame plates for supporting the motor, an intermediate drive shaft and an operator final output shaft. The motor output shaft, intermediate shaft and final output shaft are mounted on bearings at fixed centers on the frame plates and the motor and intermediate shaft are interconnected by a stretchable flexible drive belt reeved over respective drive pulleys mounted on the motor output shaft and the intermediate shaft. The drive belt may be mounted on the pulleys and replaced without adjusting the position of the motor output shaft, the intermediate shaft or the operator output shaft.

Abstract: A transmission belt for driving and/or supporting an elevator car has a longitudinally extending body including an area tensile layer reinforced by chemical fibers. The belt can have a flat friction layer or a friction layer including alternating longitudinally extending wedge-shaped ribs and grooves. Transverse grooves can be formed across the width of the longitudinally grooved friction layer.

Abstract: A driving mechanism includes: a looped metallic transmission belt; a first shaft member; a second shaft member; and a pulley that is connected to the second shaft member so as to be rotatable about a second rotational axis, in which the first shaft member includes: a rotatably supported portion that is disposed at one end; and an extended portion that is disposed at another end so as to be continuous with the rotatably supported portion, in which a portion between the contact portion and the rotatably supported portion is flexurally deformed, the extended portion being rotatable about a diagonal rotational axis that is inclined at a predetermined angle relative to the first rotational axis, and the pulley includes a inclined outer surface that is inclined, such that a portion that is most separated from the first shaft member is substantially parallel with the extended portion.

Abstract: In a power transmission chain, an increase in rigidity in connection between pins and pulleys, a reduction in looseness of the pins when the pins bite into the pulleys, a reduction in driving noise and a further increase in practical durability are attained. A chain 1 which is wound round on a pair of pulleys so as to extend therebetween includes a plurality of links 2 and a plurality of connecting members 50. A first pin 3 and a second pin 4 of the connecting member 50 are brought into rolling and sliding contact with each other at a contact portion T which is displaced in association with a change in a flexing angle between the links 2. End faces 17 of the first pin 3 each have a projecting curved portion 20 where a contact area 21 is formed when the end faces 17 are brought into contact with sheave surfaces of the pulleys.

Abstract: An electric motor driven barrier operator includes spaced apart frame plates for supporting the motor, an intermediate drive shaft and an operator final output shaft. The motor output shaft, intermediate shaft and final output shaft are mounted on bearings at fixed centers on the frame plates and the motor and intermediate shaft are interconnected by a stretchable flexible drive belt reeved over respective drive pulleys mounted on the motor output shaft and the intermediate shaft. The drive belt may be mounted on the pulleys and replaced without adjusting the position of the motor output shaft, the intermediate shaft or the operator output shaft.

Abstract: A power shaft including a belt retaining geometry is provided according to an embodiment of the invention. The power shaft includes a shaft including a normal belt position portion adapted for receiving a belt and a reduced diameter portion formed on the shaft and located adjacent to the normal belt position portion. The belt can move into the reduced diameter portion of the power shaft during operation and the reduced diameter portion creates an alignment tension force on the belt that operates to return the belt to the normal belt position portion.

Abstract: A belt unit includes an endless belt, a drive roller, a follow roller, and a braking member. The drive roller drives the endless belt to move circularly. The follow roller rotates about a rotational shaft thereof following the circular movement of the endless belt. The rotational shaft extends in an axial direction and having two axial ends. The endless belt is wound around the drive roller and the follow roller. The braking member is disposed on one of the two axial ends and is rotatable about the rotational shaft and applies a rotational friction force to the endless belt when the endless belt is in frictional contact with the braking member.

Abstract: The invention relates to an assembly drive or traction mechanism drive, which is designed as a belt drive, of an internal combustion engine, with one tensioning roller and/or one deflecting roller which encloses in each case one belt pulley. In the operating state of the belt pulley, a traction mechanism, which is designed as a V-ribbed belt, is guided on the running surface of the belt pulley. Here, the belt pulley of the deflecting roller has a smooth running surface against which the V-ribbed belt is supported with the profiled inner side.

Abstract: A control system for use in an HVAC unit comprises a circular pulley, a semi-circular pulley, and a cable interconnecting the pulleys to rotate a spur gear. A flange extends about the periphery of the semi-circular pulley and pulley gear teeth extend radially inwardly from the flange and engage the spur gear teeth. The spur gear is rotatably supported on a gear shaft which extends through a slot in the semi-circular pulley that extends arcuately between two slot ends. The slot is spaced radially between the flange and a support shaft of the semi-circular pulley thereby allowing the semi-circular pulley and the spur gear to overlap to attain compact packaging of the system.

Abstract: A belt drive of an internal combustion engine, wherein the belt pulleys are connected by an elastomer belt, for creating a mounting position, the belt pulley can be eccentrically pivoted about the screw connection after the screw connection has been removed whereby due to the diminishing distance between the axes of the belt pulleys, the placing of the elastomer belt in the required position is simplified.

Abstract: [Purpose] A belt drive system, in which a drive belt 20 is wrapped between a drive pulley 1 drivingly connected to a drive source 11 and a driven pulley 2 connected to an driven unit 12 via a joint 32 provided to stop torque transmission when receiving a load equal to or over a predetermined value and torque is transmitted via the drive belt 20 from the drive pulley 1 to the driven pulley 2, ensures that when the driven unit 12 malfunctions, the joint 32 stops the torque transmission without unnecessarily increasing the coefficient of friction against the driven pulley 2 or the belt tension. [Solution] The belt drive system is configured so that when a slip corresponding to the load on the joint 32 equal to or over the predetermined value occurs between the drive belt 20 and the driven pulley 2, the coefficient of friction between the drive belt 20 and the driven pulley 2 becomes higher than that before the slip occurs.

Abstract: A belt transporting device for circulatingly transporting an endless belt, which is in use with an image forming apparatus, such as copying machine or a printer. The belt transporting device includes a plurality of tension rolls, an endless belt laid on the tension rolls, the endless belt having a belt-end edge part protruding from an end of one of the tension roll and a guide member provided in the vicinity of the endless belt. The guide member comes in contact with the belt-end edge part so as to bend the belt-end edge part in a tapering-off direction. The guide member regulates the shape of the belt-end edge part so that a rotary peripheral length of the belt-end edge part becomes smaller than that of an area where a rear side of the endless belt is in contact with the tension roll.

Abstract: The present invention provides for a power transfer belt that is manufactured of a highly thermally conductive polymer composition, in contrast to the typical rubber material used to fabricate the belts of the prior art. The new and unique belt of the present invention is manufactured of a thermally conductive polymer material that is easily injection moldable into any desired shape and configuration. Further, the polymer composition is very thermally conductive, which assists in dissipating heat that is generated by the friction created during normal operation of the device. The new belt material and its construction allow heat to be conducted directly through the surface of the belt thus preventing heat buildup within the belt itself, thereby preserving and extending its life. Further, the present invention provides a novel method whereby a thermally conductive belt is manufactured through net shape molding.

Abstract: A pulley plate, a pulley and a belt drive system are disclosed. Each include a pulley plate or a pulley having an inner surface adapted to be driven about an axis of rotation and having a perimeter. The inner surface additionally includes a plurality of belt-wiping grooves at least partially between the axis and the perimeter. The plurality of belt-wiping grooves are located or patterned in the inner surface so as to contact the belt in different locations to reduce wear on the wall of the belt. In one embodiment, the plurality of belt-wiping grooves are centered about the axis and are unequally circumferentially spaced from one another. In another embodiment, the plurality of belt-wiping grooves are centered about a center offset from the axis.

Abstract: A figure-eight shaped drive belt for use within a pulley system, including a drive belt having a preformed figure-eight configuration. The figure-eight configuration includes a first circular-shaped loop and a second circular-shaped loop, such that the first and second circular-shaped loops are each integrally connected at two curved center sections to form an endless drive belt having the figure-eight shaped configuration. The figure-eight shaped drive belt is made from a non-expandable plastic resin material selected from the group consisting of polyurethane, polyolefins, styrenic, polyesther and other thermoplastic resins. Alternatively, the invention also relates to elliptical and oval shaped drive belts for similar uses.

Abstract: A pulley plate for use with an opposing pulley plate wherein the plates are configured so as to receive a belt therebetween. The pulley plate includes an inner surface and an outer surface. The inner surface is opposite the outer surface and is adapted for facing the opposing pulley plate. A belt-wiping surface obliquely extends from the inner surface and is located so as to engage the belt. The belt-wiping surface wipes the edges of the belt to increase the friction between the pulley plate and belt and so increase the efficiency of the pulley.

Abstract: A continuously variable all speed transmission apparatus employs a conically-shaped driven surface which is frictionally contacted by a taut endless compliant transmission member that extends to a circular power source such as the pedal hub of a bicycle. The driven surface is centered upon an axis upon which an axle is disposed that causes rotation of a wheel such as a bicycle wheel. A shifting mechanism moves the contact site of the transmission member axially along the driven surface, thereby producing variation in the rotational speed of the wheel. The transmission member includes a central wire and a series of rollers disposed upon the wire in a manner to rotate about the wire without moving longitudinally thereupon.

Abstract: A metal V-belt type continuously variable transmission in which the length of a side of an element contacting with a V-face of a pulley is shortened to increase a ratio range. If the element side length of a metal element is represented by L, the angle of the V-face of the pulley is represented by .alpha., and the hertz surface pressure between the pulley and the metal element is represented by .sigma..sub.H, the following relation is established: L .varies. sin .alpha./.sigma..sub.H.sup.2. When the hertz surface pressure .sigma..sub.H is determined to be between an upper limit value defined by the wear durability of the metal element and a lower limit value defined by the limit tensile force of an endless belt, the element side length L can be decreased by decreasing the angle of the V-face of the pulley. Thus, the distance through which the metal element can be moved radially of the pulley is increased to increase the ratio range.

Abstract: The invention concerns a tension roller made of a plastic material for adjusting a tension in a belt drive, comprising a wheel (7) having an inner ring (9) and an outer ring (10) connected to each other by axially oriented, circumferentially spaced ribs (12) and by a central web (8), the wheel (7) being rotatably mounted on a support element (2) which bears by a running face against the belt (3). According to the invention, successive ribs (12) enclose different angles with reference to a central point of the wheel.

Abstract: The combination of an endless power transmission belt construction and a pulley therefor, the belt construction and methods of making the same are provided, the belt construction having opposed inner and outer surfaces with one surface defining a plurality of longitudinally disposed and alternately spaced apart like projections and grooves that are adapted to mesh with a ribbed surface of one pulley, and a planar surface adapted to operate on a planar surface of another pulley, wherein the planar surface of the belt construction comprises a polymeric material. The polymeric material of the planar surface provides a greater tractive force on the planar surface of the pulley. The planar surface further provides means to prevent abrasive particles accumulating thereon, thereby reducing wear upon the planar surface of the pulley.

Abstract: A belt transmission mechanism has a crowned drive pulley, a crowned driven pulley, and a belt trained under tension around the crowned drive pulley and the crowned driven pulley. The crowned drive pulley and the crowned driven pulley are dimensioned to satisfy the equation:D2/D1=k.multidot.R1/R2where D1 is the diameter of the crowned drive pulley, D2 is the diameter of the crowned driven pulley, R1 is the radius of the crown of the crowned drive pulley, R2 is the radius of the crown of the crowned driven pulley, and k is a constant which is approximately 1. The belt transmission mechanism with the above drive and driven pulley dimensions can maintain its speed reduction ratio highly accurately even when the tension of the belt varies.

Abstract: A vertical lift aircraft comprising an aircraft body and a lifting assembly is presented. The lifting assembly comprises a frame wherein at least one airfoil assembly which includes a plurality of airfoils attached to a drive ring is secured. As the drive ring rotates, the airfoils move through the air and create lift. The pitch of the airfoils or blades can be fixed or variable. The drive ring is rotated by a band which is in frictional contact with the inner surface of the drive ring. The band is rotated by at least one pair of rollers which are in frictional contact with the band. Aircraft stability is controlled by regulating airfoil pitch which is responsive to pivoting of a control ring. Alternatively, aircraft stability is provided by regulating the flow of air or gas from a plurality of nozzles disposed about the aircraft. The body, a portion of which may be located inside the lifting assembly, includes a passenger and load carrying compartment and an engine assembly.

Abstract: The combination of an endless power transmission belt construction and a pulley therefor, the belt construction and methods of making the same are provided, the belt construction having opposed inner and outer surfaces with one surface defining a plurality of longitudinally disposed and alternately spaced apart like projections and grooves that are adapted to mesh with a ribbed surface of one pulley, and a planar surface adapted to operate on a planar surface of another pulley, wherein the planar surface of the belt construction comprises a polymeric material. The polymeric material of the planar surface provides a greater tractive force on the planar surface of the pulley. The planar surface further provides means to prevent abrasive particles accumulating thereon, thereby reducing wear upon the planar surface of the pulley.

Abstract: A pulley comprising a hub (12) having a substantially cylindrical outer face and a pair of rim halves (11a and 11b) adapted to be mounted to the hub and having opposed inner axial faces which are divergent with respect to each other, a separable pulley tire (13) having a cross-sectional configuration corresponding substantially to the space defined between the hub and the inner axial faces of the rimmed halves and having an inner circumference where by the tire is snugly received on the hub and is clampingly received between the rim halves said tire having a reinforcing ring (15) located at or adjacent the inner circumference of the tire, the outer circumference of the tire being formed with a peripheral groove (14) for accommodation of a rope or cable.

Abstract: A flat belt transmission has two spaced flat pulleys and a flat belt reeved around the flat pulleys. Each pulley can have a plurality of crowns arranged in the width direction of the outer periphery thereof. The flat belt can be a plurality of belts with a narrow width, one for each of the crowns. The flat belt can be a single belt with a part extending in the longitudinal direction of the belt in its inner periphery. The flat belt can be used with the flat pulley of the above construction or a flat pulley having a single crown of its outer periphery. In addition, the plurality of crowns are formed on the outer periphery of the flat pulley so as to be spaced at the same distance from the center of rotation of the pulley, or the outer periphery of the flat pulley can be in the form of a circular arc to change height of the crowns.

Abstract: An endless power transmission belt construction, a rotatable pulley therefor, a combination of the belt construction and pulley and methods of making the same are provided, the belt construction having opposed side edges and having an inner surface defining a plurality of longitudinally disposed and alternately spaced apart like projections and grooves for meshing with an outer peripheral ribbed surface of a rotatable pulley, each projection of the belt construction having a generally V-shaped transverse cross-sectional configuration defined by two substantially straight side edges that converge from the respective apexes of the grooves of the belt construction that are on opposite sides of that projection to an apex of that projection, the side edges of each projection of the belt construction defining an angle of approximately 60.degree. therebetween with the thickness of the belt construction being substantially the same as the thickness of a similar belt construction wherein the angle is approximately 40.

Abstract: Power-transmission sheaves conventionally include a centrally-open and shaft-engageable hub portion surrounding a directionally transversely extending hub-axis and together with at least one grooved belt-training portion that is surroundably connected to the hub portion and that provides a grooved outward periphery for the sheave. The at least one belt-training portion includes transversely separated flanged sides for the belt-training groove. Such conventional power-transmission sheaves are given enhanced belt engagement by providing one, or preferably both, of the flanged sides with a plurality of transversely extending openings therethrough.

Abstract: In a belt transmission apparatus utilized between an engine of a motorcar and an auxiliary apparatus thereof, a pulley groove angle .theta. of V-belt pulleys is set in the range of 45.degree. to 60.degree., where slip of the belt easily occurs. A belt angle .alpha. between both sidefaces of the V-belt is set in the range determined by the inequality .theta.-7.ltoreq..alpha..ltoreq..theta. with respect to the pulley groove angle .theta..

Abstract: An automatic garage door opener mechanism having improved safety and security is disclosed, which comprises:(a) an electrically-operated motor capable of turning an internal shaft, said shaft having at one end thereof a plurality of annular grooves and ribs cut directly into said shaft and suitable for engagement with a rib-and-groove tractive face belt;(b) a driven wheel interconnecting with a drive mechanism capable of opening or closing a garage door; and,(c) a rib-and-groove tractive face belt wherein the ribs and grooves are parallel to the length of the belt, said belt being in mating engagement with the plurality of annular grooves and ribs of the internal shaft of said motor, and in tractive engagement with the surface of said driven wheel.

Abstract: A weight reduced pulley for "K" type poly-v belt systems includes a body having an outer cylindrical surface. A plurality of raised ribs extend from said surface and run circumferentially around said surface. A plurality of trough areas are positioned between the ribs. The ribs and troughs corresponding to the location of indented and raised areas, respectively, on a poly-v belt. The ribs have a cross sectional profile extending radially traverse of the axis of rotation of the pulley, each rib being bounded by a pair of planar side walls at relative angles of 40.degree.+0.5.degree.. The side walls terminate in a 140.degree. arc having a radius of 0.5 mm, the outermost point of said arc terminating 0.96 mm inward of the intersection of the upward projections of the planar side walls or apex. The planar side walls extend radially inward at least 3.44 mm from said apex. The trough areas are bounded by the outer cylindrical surface of said pulley, said surface being 3.57 mm from said apex.

Abstract: A drive system drives a plurality of whorls rotatable about respective whorl axes and having radially outwardly directed faces centered on the respective axes, forming a discontinuous whorl surface, and of a predetermined whorl width measured parallel to the respective axes. The system has an endless flat drive belt extending past the whorls generally perpendicular to their axes and having a first belt surface radially directly confronting the whorl surface and of a predetermined axial belt width measured parallel to the axes and pusher rollers bearing radially inward against the belt and urging the belt surface toward the whorl surface. A ridge is formed on one of the surfaces, radially engages the other surface, holds the rest of the other surface out of contact with the one surface except at the ridge, and is of a predetermined ridge width in contact with the other surface and measured parallel to the axes equal to at most one-third of the belt width.

Abstract: A continuously variable transmission for a vehicle (FIG. 1) has a drive pulley (4), a driven pulley (11), and a tension pulley (19) each having a pair of axially spaced rotors. The opposed inner faces of the rotors of each pulley are formed with slopes which have gradients with respect to the respective axis of rotation increasing continuously in proportion to the radii of the faces. A plurality of belts made up of thin bands (22a, 22b, 22c) run on the three pulleys (4, 11, 19) such that the respective band edges are in contact with the respective slopes of the three pulleys. The distances between the respective slopes of the drive and driven pulleys are variable, so that the rotating speed ratio between the drive and driven pulleys can be varied by varying the contacting radii of the belts with the drive and driven pulleys, while uniform tension is imparted to the belts by the tension pulley.

Abstract: In a belt and pulley system wherein motion is transferred between the two members, the belt is a metal belt having a pulley engaging face made of a relatively soft material and the pulley is one having a regular pattern of small hard protuberances, such as formed by knurling, on its belt engaging face which press into the soft metal of the belt to form permanent depressions arranged in a matching pattern which mesh with the protuberances to provide a positive slip-free motion transfer. The belt and pulley drive may be used advantageously in a device such as an X-Y plotter for accurately positioning, with good repeatibility and fine resolution, an associated member driven in one coordinate direction by the metal belt driven in turn by the knurled pulley.

Abstract: A belt-pulley drive mechanism comprising a pulley having a plurality of circumferentially extending grooves of V-shaped cross-sectional configuration, a belt adapted to be passed around the pulley and stretched under tension so that the belt is engaged with the pulley in torque transmitting relationship, the belt being formed with a plurality of longitudinally extending ridges of V-shaped cross-sectional configuration which are adapted to be engaged with the grooves in the pulley when the tension is applied to the belt. The grooves or the ridges or both are formed in a cross-section along a concave line so that a clearance is formed between the pulley and the belt when the tension is removed from the belt, the clearance being larger at a transversely central portion than at side edge portions.

Abstract: A method of making a ribbed belt having a plurality of longitudinally extending ribs is provided, wherein a vulcanized belt sleeve is put into one mandrel or said belt sleeve laid over two mandrels and cut with a milling attachment combining multiple double angle milling cutters in such a manner that the rotation of the milling attachment is opposed to that of the mandrel and the revolution speed of the milling attachment is greater than that of the mandrel, thus precisely defining a ribbed section of the belt in a simultaneous manner.

Abstract: An endless belt apparatus (10) which can be used in either a timing, driving, and/or load carrying system, has a generally cylindrical drive pulley (12) in the outer surface (22) of which is provided recesses for engaging with an associated belt (26) including a planar web (28) provided with projections (34, 34') arranged in a symmetrical matrix for positively engaging with the recesses of the pulley for tracking and/or advancing the belt. Similar recesses provided in the other pulleys of the system will permit the belt to rotate such pulleys as a function of the rotation of the drive pulley.