Abstract: The combination of a toothed pulley and a toothed belt and method of making the same are provided. The toothed belt has teeth that serially mesh with cavities of the pulley that are respectively disposed between adjacent teeth thereof and that respectively have bottoms. Each belt tooth has a longitudinal cross-sectional configuration that defines a pair of spaced side faces that respectively have free end portions that are remote from adjacent roots thereof and that are spaced apart from each other by a bottom face of the tooth, each bottom face having a center.

Abstract: The combination of a toothed pulley and a toothed belt and method of making the same are provided. The toothed belt has teeth that serially mesh with cavities of the pulley that are respectively disposed between adjacent teeth thereof and that respectively have bottoms. Each pulley tooth is substantially curvilinear. Each belt tooth has a longitudinal cross-sectional configuration that defines a pair of spaced side faces that respectively have free end portions that are remote from adjacent roots thereof and that are spaced apart from each other by a bottom face of the tooth, each bottom face having a center.

Abstract: An endless power transmission belt construction and method of making the same are provided, the belt construction comprising an outer tension section, an inner compression section and a load-carrying section secured to and disposed intermediate the tension section and the compression section, the compression section having an inner surface defining a plurality of longitudinally disposed and alternately spaced apart projections and grooves and a plurality of transversely disposed and alternately spaced apart projections and grooves. Each transverse groove has a depth between approximately 0.070 of an inch and approximately 0.080 of an inch and is spaced from the next adjacent transverse groove thereto by a distance between approximately 0.3 of an inch and approximately 0.4 of an inch while each longitudinal groove has a depth of approximately 0.095 of an inch and is spaced from the next adjacent longitudinal groove thereto by a distance of approximately 0.140 of an inch.

Abstract: A sprocket and flexible tape combination is disclosed wherein the tape has a thickness which is a relatively large fraction of the radius of the sprocket so that the tape is relatively stiff. The tape has web areas between longitudinally adjacent apertures and has connecting areas laterally adjacent each aperture connecting longitudinally adjacent web areas. These connecting areas of the tape engage engagement shoulders which are disposed around the periphery of the sprocket and these engagement shoulders alternate with sprocket surfaces around the periphery. All of the engagement shoulders have the same radius from the axis and a sprocket tooth is mounted on each of the engagement shoulders to engage a respective aperture in the tape.

Abstract: A toothed-belt and toothed-pulleys transmission including means for widening the teeth of the toothed-belt, said means corresponding to the top of each belt tooth and the base of each toothed-pulley groove.

Abstract: A toothed, positive drive, power transmission belt of the type having an endless substantially inextensible tensile member to which are secured belt teeth having a curvilinear cross-section and covered by an outer non-stretch fabric cover. In the body of each tooth is a layer of fabric reinforcement separated from the outer cover fabric of the belt tooth and of the land region between belt teeth by a cushion layer of elastomeric material of varying thickness so that the outer tooth portions are free to flex while the inner portion of the tooth is reinforced against shear. The resulting construction provide belts having substantially longer belt life than conventional belts at relatively high horsepower application.

Abstract: A toothed drive belt having inner and outer reinforcing fabric layers. The inner layer has a large mesh size, is highly stretchable, has a fine warp of 30 to 210 d, has a normal weft, and the sum of the cover factors of the warp and weft are no more than 20. The inner layer may have either a flat or a wavy shape within the teeth. The outer layer has a low stretchability and a normal warp and weft. The inner layer, which is bonded strongly to the rubber substrate of the belt due to its large mesh size, easily follows the deformations of the teeth. Due to a small thread size, the amount of PLD is reduced.

Abstract: A belt construction and method of making the same are provided, the belt construction having opposed sides and comprising a tensile unit intermediate the opposed sides, a plurality of teeth defining one of the opposed sides of the belt construction and being mainly formed of a first polymeric material that has reinforcing fibers therein, each tooth having opposed sides that are disposed in spaced relation to adjacent sides of adjacent teeth, the belt construction having a land area between adjacent teeth, and a backing member defining the other of the opposed sides of the belt construction, the backing member being mainly formed from a second polymeric material that is initially separate from the material of the teeth.

Abstract: A toothed belt constituted by an annular body of elastomeric material, having a structure that is resistant to tensile stress embedded therein and having a toothing on one of its faces. The teeth of said annular body have at least one slot corresponding to their own top.

Abstract: A drive system having a toothed pulley and a cooperating toothed power transmission belt wherein the teeth of the belt are provided with transverse slots opening inwardly through the center of the tip of the tooth. The teeth are formed of resilient material, permitting the teeth to be constricted longitudinally as an incident of engagement thereof with the pulley to substantially close the slot in the engaged relationship with the pulley, thereby substantially eliminating backlash between the belt teeth and the pulley teeth, while effectively eliminating tooth deflection.

Abstract: An angular transmission mechanism having two axles angularly disposed for torque transmission therebetween by two bevel gears which are embraced by an elastic toothed belt having a surface area which, in the untensioned condition of said belt, has the shape of a truncated cone, the belt having teeth which correspond to the teeth of the bevel gears.

Abstract: A toothed power transmission belt with belt teeth having flank surfaces in the form of a tractrix curve and a belt sprocket with sprocket teeth having flank surfaces in the form of a tractrix curve, together, the belt and sprocket exhibiting smooth running and antiratcheting characteristics.

Abstract: A toothed belt drive system wherein either or both of the belt teeth and pulley grooves include, in cross section, elliptical arcuate portions coordinated with circularly arcuate portions in providing resistance to cracking, minimizing of tapping noise by engagement of the belt groove roots with the pulley teeth, smooth withdrawal of the belt from the pulley, and abrasion of the belt groove root portions. The tooth and pulley groove configurations may include rectilinear portions. Preferred angular relationship between the elliptical arc axes and dimensions of the different portions of the belt teeth and pulley groove configurations embodying the invention are disclosed.

Abstract: A toothed belt having a fabric adhered to the toothed portion of the belt formed of synthetic resin yarns having an ultimate viscosity of greater than approximately 1.30. In the illustrated embodiment, the yarns extending in the longitudinal direction of the belt are fully processed yarns. The cloth is preferably a woven cloth wherein one or the other of the weft and warp are wooly processed. The use of the disclosed cloth provides a substantial improvement in resistance of the belt to cracking and shearing of the teeth in use.

Abstract: A synchronous power transmission system and a toothed belt therefor. The belt having convex curvilinear flanks shaped to minimize the generation of unpleasant sound resulting from meshing of such belt with a pulley.

Abstract: A belt construction provided, the belt construction comprising a tensile member intermediate the opposed sides of the belt construction, a plurality of teeth defining one of the opposed sides of the belt construction and being mainly formed of a first polymeric material that has reinforcing fibers therein, the belt construction having a land area between adjacent teeth, and a backing member defining the other of the opposed sides of the belt construction, the backing member being mainly formed from a second polymeric material that is initially separate from the material of the teeth and is substantially free of fibers therein, the material of the backing member having a surface that joins with a surface of each tooth whereby the joining surfaces define an interface line therebetween, the interface line in each land area having a portion thereof disposed spaced from the tensile member on the side thereof opposite to the side thereof that faces toward the teeth.

Abstract: A belt drive system comprising a toothed belt having a plurality of equally spaced teeth on the surface of the belt body and toothed pulleys having a plurality of equally spaced teeth to engage with the belt teeth on the surface of the pulley body of each pulley. The belt teeth have one or more cut grooves in the longitudinal direction of the belt and the toothed pulleys have one or more ribs, to engage with the cut grooves in the belt teeth, on the surface of the pulley body of each pulley.

Abstract: An endless power transmission V-belt construction and method of making the same are provided, the belt construction being formed mainly of polymeric material and having rounded top and bottom teeth respectively extending along the length of the top and bottom surfaces of the belt construction, the belt construction comprising a tension section having the top surface, a compression section having the bottom surface, and a load-carrying section disposed intermediate the tension section and the compression section. The bottom to top tooth pitch ratio of the belt construction, the bottom to top tooth depth ratio thereof, and the belt thickness to flex thickness ratio thereof may be varied in specific instances to optimize performance in specific uses.

Abstract: A V-belt 10, 110, 210, 310, 410, 510, 610, 710, and 810 having a rubber body 111, 211, 311, 411, 511, 611, 711 and 811 defining an upper surface 12, 112, 212, 312, 412, 512, 612, 712 and 812 and a lower surface 13, 113, 213, 313, 413, 513, 613, 713 and 813 and a plurality of substantially parallel low elongation high-strength tensile cords 14, 114, 214, 314, 414, 514, 614, 714 and 814 extending lengthwise longitudinally of the V-belt intermediate the upper and lower faces. A plurality of filament reinforcing elements 16, 17, 116, 117, 216, 316, 416, 516, 616, 716, 816, 217, 317, 417, 517, 617, 717 and 817, 224, 428 are provided for resisting transverse expansion of the V-belt during high power drive operation. The transverse filament reinforcing elements selectively define monofilament elements and bundled filament elements as desired. Different arrangements of the reinforcing elements in the belt body are disclosed.

Abstract: A toothed-belt and toothed-pulleys transmission including means for widening the teeth of the toothed-belt, said means corresponding to the top of each belt tooth and the base of each toothed-pulley groove.

Abstract: An interlocking driving belt wrapped around a toothed driving wheel and a toothed driven wheel to transmit power from the former wheel to the latter wheel, comprising a plurality of toothed blocks having tooth-shaped portions capable of being meshed with tooth spaces on outer circumferential surfaces of both of the wheels, a plurality of rollers held rotatably among the toothed blocks, a flat endless belt member wrapped tightly around outer circumferential surfaces of the rollers, stopper plates fixed to the toothed blocks, each of which stopper plates contacts one of two adjacent toothed blocks to retain these two toothed blocks in predetermined positions, and roller-receiving recesses provided in both of side surfaces of the toothed blocks to hold adjacent rollers therein. This interlocking belt can be made in small dimensions and weight at a low cost and can be suitably used to transmit high torque at a high speed under both the dry and wet conditions.

Abstract: A cog-belt-driven power transmission device comprising a belt pulley having a cogging on the outer periphery and a belt having a corresponding cogging on the inner surface. In order to suppress the noise produced during rotation of the belt pulley one or more discharge channels for air entrapped between the coggings are made in the cogging of the belt pulley and/or the belt, said discharge channels connecting the cog gaps to the atmosphere.

Abstract: Belt for transmitting motion between two pulleys comprising a flat-shaped annular body of elastomeric material, reinforced with continuous and flexible elongated elements, resistant to traction and arranged in the longitudinal direction of the belt, a plurality of openings in the belt to engage with protuberances on the pulleys, at least one continuous reinforcing element disposed around the opening with ends anchored to the longitudinal elements.

Abstract: A long synchronous belt made primarily of elastomeric material is provided which comprises a plurality of narrow, toothed strips joined in side-by-side fashion, each strip having at least one longitudinally-extending reinforcement located therein. Also provided is a method for making such a belt which comprises the steps of providing a first belt sleeve having the desired tooth configuration, cutting the first sleeve into a continuous strip, winding the strip to form a second sleeve of desired circumferential length, joining the adjacent strips of the second sleeve in side-by-side fashion, and cutting at least one belt of desired width from the second sleeve.

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 belt.

Abstract: A closure operator such as a garage door operator utilizes an apertured flexible tape. The tape is enclosed in a guide and a drive sprocket has teeth engaging the apertures to apply both tension and compression forces to open and close a door. The apertures are enlarged in width and length and the tape has fewer apertures per-unit-length compared to the prior art tape. This decreases the stress per-unit-area in the tape at each tooth and increases the shear strength of the webs between successive apertures to be more nearly equal to the tensile strength of the tension band areas of the tape.

Abstract: A drive belt (10) having an elongated body (11) provided with tensile cords (12). The belt is provided with teeth, or cogs, (13) and a two-ply reinforcement is provided on the surface of the teeth, or cogs, including an inner layer (15) and an outer layer (17). The inner layer is formed of parallel yarn, or twine, elements (16), which may be spirally wrapped to extend in the longitudinal direction of the belt. The outer layer is formed of a woven or knit cloth, and in the illustrated embodiment, is formed of a sailcloth having a highly elastic warp extending in the longitudinal direction of the belt and an inelastic weft for providing improved transverse rigidity and strength. The first layer yarn (16) and second layer warp (19) preferably have a ductility of greater than 50%. A number of candidate materials for the high ductility yarns is disclosed.

Abstract: A flexible power transmission belt having a plurality of teeth each of which has a pair of arcuate convex flank portions which in longitudinal cross-section closely approximate to an arc of a circle. Each tooth exhibits a height to width relationship within a predetermined range, and the arcuate flanks each have a pressure angle within a predetermined range. The belt is preferably used in combination with a toothed pulley whose teeth are substantially conjugate to the belt teeth and whose cavities between the teeth have a height to width relationship within another predetermined range and have concave flanks exhibiting a pressure angle in still another predetermined range, said belt tooth width being approximately 0.98 of the pulley cavity width so as to provide a high torque positive drive power transmission system having minimum backlash.

Abstract: A toothed belt drive which is particularly suitable for use in harvesting machines has belt teeth which are trapezoidal in plan and cross-section perpendicular to the direction of motion of the belt. The belt teeth are alternately oriented with the larger side edge of the base adjacent opposite side edges of the strip-like belt. The belt teeth are adapted to engage in recesses in a belt pulley which are complementarily shaped. The recesses in the belt pulley are laterally open adjacent the wider side edge to enable any foreign matter entering said recesses to be readily ejected therefrom.

Abstract: A belt construction and method of making the same are provided, the belt construction having a plurality of teeth defining one of the opposed sides thereof and being mainly formed of a first polymeric material that has reinforcing fibers therein, and having a backing member defining the other of the opposed sides of the belt construction and being mainly formed from a second polymeric material that is initially separate from the material of the teeth and is substantially free of fibers therein, the materials defining an interface line therebetween with the interface line in each land area having a portion thereof disposed spaced from the tensile member on the side thereof opposite to the side thereof that faces toward the teeth.

Abstract: A drive belt manufacture wherein tensile cords (16) are provided with a Lang twist having a ply twist constant of approximately 2.9 to 3.9 and a cable twist constant of approximately one-fifth to one-half of the ply twist constant. In a preferred embodiment, the tensile cords are formed of aromatic polyamide fibers and are provided with an adhesive coating from a solution of resorcinol, formalin, and latex rubber. The invention further comprehends subjecting the cords to a pretreatment of such an adhesive solution, an epoxy resin, or an isocyanate compound. The resultant twisted cords provide improved long life characteristics for use in drive belts and the like.

Abstract: A flexible continuous device is provided for transmitting torque between a driving pulley and a driven pulley. The device comprises a plurality of strut members arranged in aligned side-by-side relation with each member having a predetermined pitch radius relative to the pulley axes. Adjustably engaging a corresponding surface of each strut member is a continuous flexible band member. The engagement between the band member and each strut member surface is at a greater radius than the pitch radius when the strut member is in contact with the periphery of a pulley. A unit is mounted on each strut member and coacts therewith to retain the band member and strut members in assembled relation. Each unit has a portion thereof which protrudes longitudinally of and overlies the exterior of the band member. The protruding portion of each unit extends a predetermined distance beyond the strut member on which it is mounted. The protruding portions of adjacent units are disposed in substantially nested relation.

Abstract: A power drive system including a toothed belt (10) arranged for improved engagement with a grooved pulley (15). The belt teeth (13) define, in longitudinal cross section, planar flank surfaces (22, 23) and an intermediate arcuate tip surface (25). The pulley groove (14) has corresponding planar flank surfaces (17, 18). The arcuate distal portion of the belt tooth is disposed within an arcuate segment centered on the point of intersection (19) of a flank surface (17) of the belt pitch line (20) defined by the tensile members (12) of the belt body portion. The tooth tip portion (25) defines a circular cross section centered on a point (37) disposed within a preselected range on the tooth centerline (24).

Abstract: A toothed belt having fore and aft tooth flank surfaces defined in cross section by arcs having radii generally equal to the pitch spacing of the belt teeth. A sprocket having teeth with fore and aft flank surfaces defined in cross section by arcs having radii generally equal to the pitch spacing of the sprocket teeth. In combination, a drive comprising the belt and sprocket as described.

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.

Abstract: The present invention relates to a toothed belt provided with an undulated fabric embedded in the part of the belt's body between its tension resistant insert member and its back. The elastomeric material of the toothed belt disposed between the undulated fabric and the back has a lesser hardness than that forming the remaining part of the belt.

Abstract: A belt tooth is provided with an arcuate surface at its tip for engaging and compressing against the bottom surface of a pulley groove to decrease noise and vibration in a toothed belt power transmission system.

Abstract: In a positive drive power transmission system composed of a toothed belt and two or more pulleys, operating noise resulting from the impact of the belt and the pulleys is dramatically reduced by having surface discontinuities on either the belt or on the pulleys on those surfaces where the belt and the pulleys engage in impact contact when in operation. The surface discontinuities may be formed by recessed or raised portions of the belt or pulleys, may be straight or curved, and may be substantially parallel to the tensile member or at an angle thereto. Several methods of manufacturing belts with such surface discontinuities are disclosed.

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.

Abstract: A pulley configuration which increases the contact area between the pulley tooth tips and the land area of the belt teeth. The increased contact area reduces land area wear between belt teeth. The pulley tooth tip has a longitudinal cross-sectional contour partially composed of two substantially circular arcs connected by a line segment which is substantially straight or slightly curved. The length of the line segment is from 5 percent to 100 percent of the width of the belt tooth on which the pulley is used, and preferably between 6 percent and 33 percent of the width of the belt tooth. The pulley in combination with a toothed belt forms a positive power transmission system.

Abstract: A toothed positive drive power transmission belt of the type having an endless substantially inextensible tensile member to which the belt teeth are secured, which teeth have a curvilinear cross-section and may be covered by an outer protective fabric or the like. In the body of each tooth is a layer of fabric reinforcement separated from the outer surface of the belt teeth by a cushion layer of soft elastomeric material so that the outer surface is free to flex while the inner portion of the tooth is reinforced against shearing.

Abstract: An endless flexible, elastomeric or plastic power transmission belt has a series of outwardly projecting, longitudinally spaced teeth having bases integral with the belt body and an opposite free end for meshing with teeth of a pulley. The free end of each tooth is smaller in longitudinal dimension than the base and the surfaces facing adjacent teeth of the series are curved outwardly toward the adjacent teeth. The curvature is defined by the trigonometric tangent of the angles between a straight line tangent to the curvature and a straight line parallel to the base. The trigonometric tangent increases linearly from the free end of the tooth towards the base according to a constant coefficient that is a function of the mechanical characteristics of the material from which the belt is made and the dimensions of the tooth.

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.

Abstract: A pulley configuration which increases the contact area between the pulley tooth tips and the land area of the belt teeth. The increased contact area reduces land area wear between belt teeth. The pulley tooth tip has a longitudinal cross-sectional contour partially composed of two substantially circular arcs connected by a line segment which is substantially straight or slightly curved. The length of the line segment is from 2 percent to 100 percent of the width of the belt tooth on which the pulley is used, and preferably less than about 7 percent of the width of the belt tooth. The pulley groove depth may be less than the height of the belt tooth and the groove has a longitudinal cross-sectional contour partially composed of two substantially circular arcs connected by a line segment which is substantially straight or slightly curved. The pulley in combination with a toothed belt forms a positive power transmission system.

Abstract: A single or multiple strand molded notch V-belt and a method for its production is described. The method is characterized by use of an open-ended mold having rigid transverse notches and longitudinal ribs forming a plurality of mold cavities. The belt has undulating mold-formed notches which in one embodiment carry a fabric facing of a particular design to retard initiation and propagation of undercord cracks during operation of the belt around associated sheaves.

Abstract: A synchronous belt is provided which has a plurality of angled ridges in the backing layer thereof. These ridges are oriented in a direction opposite the direction of the spirally wound tensile cord and the magnitude of the ridge angle is at least equal to the magnitude of the cord spiral angle. Also provided is a process for making this belt.

Abstract: A synchronous belt drive system, particularly for small drive pulleys, and method of making such pulleys. The pulley has an optimum pitch radius for its belt teeth addendum circle which has a size between the limits of a maximum pitch radius determined by the radius of a circle through the points of a regular polygon having N equal sides and a minimum pitch radius determined by the radius of a circle having N arcs each equal in arcuate length to the length of each side of said polygon.

Abstract: A toothed transmission chain or belt is described for use in coupling spaced sprockets or gears. The chain is formed of molded polyurethane or other plastic having sprocket engaging teeth molded onto a supporting unitary molded backing. The molded portion is reinforced by one or more metal cables which are embedded in the molded plastic portion. An improved engagement with the sprockets is provided for by providing lateral slots in the chain teeth thereby giving them variable width. Additionally, the chain may be furnished or originally formed in indeterminate lengths and then fashioned into an endless chain by exposing and splicing together the ends of the steel reinforcing cables.

Abstract: An adjustless V-belt and method of manufacturing the same is disclosed. The power transmitting belt automatically absorbs and adjusts its elongation to maintain constant tension.

Abstract: A construction and method of manufacture of a feed belt are presented wherein the belt is an endless body of elastomeric material reinforced with a fabric sleeve and having a toothed inner surface and a non-toothed outer surface, the inner and outer surfaces being treated so that the outer surface has a significantly higher coefficient of friction than the inner surface.