Polymer Digest - Plastic Gears Patents (Class 74/DIG10)
  • Patent number: 4813303
    Abstract: A speed reducer construction for use with a drive motor which has a drive motor housing and a drive motor shaft which extends out of the housing comprises a reducer housing which is adapted to be coupled to the drive motor housing and encloses a portion of the motor drive shaft. The motor drive shaft is advantageously journalled in the reducer housing and it carries a worm made of a Nylatron material which is rotatable therewith. An output shaft extends transversely to the drive shaft and is journalled in the reducer housing and it carries a sleeve which is keyed thereto for rotation therewith. A gear is freely rotatable on the sleeve alongside a collar portion of the sleeve and is in meshing engagement with the worm. The drive of the motor through the worm to the gear and the output shaft is regulatable by a clutching device including a clutch spring which is biased against an end of the gear with a biasing force which is regulated by a torque adjusting wheel which is threaded on the sleeve.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: March 21, 1989
    Assignee: Mandreles, Inc.
    Inventors: Earl F. Beezer, Daniel F. Sullivan
  • Patent number: 4802372
    Abstract: A transmission that uses a gear set in the form of a pair of gears stacked rigidly together to couple a driving gear to a driven gear has its ratio determined by the relative number of teeth of the stacked gears and the gears with which the stacked gears mesh. If the number of teeth of either or both gears in the stack is varied, the axle of the stack must be moved to a different location in order to keep all of the pairs of gears meshed. The transmission has two or more axle-receiving locations to receive the axles of stacks effecting different ratios. To simplify assembly, the stacks are color-coded according to the ratios they effect. Stacks of the chosen color will only fit in one axle location. The selected stack may be enclosed in the transmission housing so that its color code will not be visible after assembly of the transmission.
    Type: Grant
    Filed: June 20, 1985
    Date of Patent: February 7, 1989
    Assignee: Kransco
    Inventors: Lawrence R. Harrod, Michael R. Siebern
  • Patent number: 4793196
    Abstract: A gear coupled, counter-rotating vibratory assembly is described for producing a fine tuned accurate linear vibratory motion without any twisting force component. The assembly has two parallel shafts that extend through a gear casing with cantilevered ends extending outward from both sides of casing. Large intermeshing gears are mounted on the shafts to rotate the shafts in counter-rotating synchronized motion. One of the gears has metal teeth and the other gear has plastic teeth. Identical eccentric weights are mounted on the cantilevered shaft ends outside of the gear casing at the same angular positions to generate the linear vibratory motion. The eccentric weights on the drive shaft are offset inward of the weights on the driven shaft. The radius of each of the eccentric weights is greater than the radius of the gear but less than the diameter of the gears.
    Type: Grant
    Filed: March 24, 1987
    Date of Patent: December 27, 1988
    Assignee: Key Technology, Inc.
    Inventors: Walter L. Davis, Joseph C. Thomas
  • Patent number: 4785679
    Abstract: A pinion assembly (30) for an electrical starter motor (20) includes a metallic pinion nut (4) threadedly received on an output shaft (22) of motor (20). A first bushing (36) includes a radially extending annular flange (40) which is fixed to and covers nut (4) and a cylindrical axially extending shell (42). A metallic drive pinion (32) is supported on shell (42) and is electrically insulated from shaft (20) by shell (42) and from nut (4) by annular flange (40). However, slip clutch (14) is located between first bushing (36) and drive pinion (32) to transmit torque therebetween. Finally, cylindrical member (62) retains drive pinion (32) on bushing (36).
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: November 22, 1988
    Assignee: The Toro Company
    Inventors: John H. Weber, Larry W. Schmidt
  • Patent number: 4784088
    Abstract: A drive device for coolant pumps having a pump shaft, a boss having a bore in which the pump shaft is rotatably disposed and a driven gear made from synthetic resin to transmit the rotational power from the crankshaft to the impeller to move the coolant into circulation through the coolant jacket for engine cooling, is disclosed which comprises a pin, fixedly implanted in radial pattern in the circumference of the pump shaft, a couple of radially extending grooves outwardly from the center of the driven gear bore in that side of the driven gear facing the impeller to receive therein fittingly the pin, respectively, and a washer mounted about the pump shaft between the front end face of the bore and the pin so as to prevent the pump shaft from falling off from its bore. When the driven gear is driven by the crankshaft, the pin closely fitted in the grooves transmits the torque to the pump shaft, without any slip.
    Type: Grant
    Filed: November 20, 1986
    Date of Patent: November 15, 1988
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Shinichi Tamba, Akio Miguchi
  • Patent number: 4760752
    Abstract: A part, providing its own plastic deformation method and an exemplary embodiment, a polycarbonate spur gear, is disclosed. In a part having at least one region adapted to be deformed due to press-fit forces acting upon said region deformation is decoupled from proximate critical surfaces by providing at least one aperture in said part in a second region which is spaced from said first region in the general direction of the resultant vector of said forces such that said deformation is relieved by said aperture.In its basic aspects, an exemplary embodiment of the present invention, a plastic spur gear which remains rotationally concentric by embodying the inventive concept is described.
    Type: Grant
    Filed: April 1, 1987
    Date of Patent: August 2, 1988
    Assignee: Hewlett-Packard Company
    Inventors: Paul J. Wield, Curt N. Torgerson
  • Patent number: 4729250
    Abstract: A lead screw for moving, for example, a printing head or a magnetic head. The screw is molded from plastics by a split mold comprising a plurality of longitudinally extending sections. It has on its outer peripheral surface a helical groove satisfying the following relationship: ##EQU1## where P: pitch of the groove;R: radius of the screw;r: radius of the screw between its longitudinal axis and the bottom of the groove;.theta.: angle of division of the mold sections; andL: a half of the difference in width between the top and bottom of the groove. The bottom of the groove is smaller in width than the top thereof.
    Type: Grant
    Filed: January 23, 1986
    Date of Patent: March 8, 1988
    Assignee: Seikosha Co., Ltd.
    Inventors: Yoshiaki Ikeda, Yoshio Tamura, Hiroshi Noritake
  • Patent number: 4715243
    Abstract: A planetary reduction gear has an internally-toothed ring gear which is made of a molded synthetic resin. The ring gear has a rim formed in its outer periphery in which is formed a plurality of seats comprising through seats and non-piercing holes, the seats being provided at equal intervals around the periphery of the rim. The non-piercing seats extend only part way through the thickness of the rim. The provision of seats over the entire periphery of the rim causes sink marks which develop at the time of molding of the ring gear to act uniformly and deformation of the ring gear is prevented.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: December 29, 1987
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akira Morishita, Kyoithi Okamoto, Toshihiko Gotoh, Yukio Kako, Takemi Arima
  • Patent number: 4712451
    Abstract: A starter with a gear reduction mechanism including an internal ring gear formed of synthetic resin and a reinforcing member. The internal ring gear has a cylindrical portion and a toothed portion formed on an inner peripheral surface of the cylindrical portion. The reinforcing member is secured around an outer surface of the cylindrical portion.
    Type: Grant
    Filed: January 14, 1986
    Date of Patent: December 15, 1987
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akira Morishita, Kyoichi Okamoto, Taiichi Nakagawa, Hiroyuki Morikane, Akinori Hasegawa, Takemi Arima, Tadami Kounou
  • Patent number: 4695262
    Abstract: A toy rotating gear accessory which may be used in conjunction with a gyroscopic top. The accessory has a supporting body with a number of apertures passing through it. One or more circular gears may be removably attached to the supporting body by segmented flexible members located on the top surfaces of the gears. The flexible members may be inserted into or slid out of the apertures in the supporting body by simply bending the members. After the gears are attached to the supporting body, they are free to rotate with respect to the body. Protuberances located on the top surface of each gear help to reduce friction between the gears and the supporting body. Supports located on the bottom surfaces of the gears support the accessory on a horizontal surface. During play, a child may insert the rotating portion of a gyroscopic top into a cylindrical bore located on the upper surface of one of the gears. This causes the gear to rotate and the entire accessory to rotate about the center of the gear.
    Type: Grant
    Filed: June 23, 1986
    Date of Patent: September 22, 1987
    Assignee: Mattel, Inc.
    Inventors: Michael A. Crosby, Art J. Foss
  • Patent number: 4651575
    Abstract: A gear having a good balance of mechanical characteristics such as shock resistance, wear resistance, and flexible strength is molded from nylon resin containing 3-10 wt % of carbon fibers and 20-40 wt % of glass fibers.
    Type: Grant
    Filed: May 15, 1985
    Date of Patent: March 24, 1987
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akira Morishita, Kyoichi Okamoto, Takemi Arima
  • Patent number: 4651229
    Abstract: The carriage of a digital document reader is shifted by means of a pair of worms rotatable in the frame and engaging two nuts borne by the carriage. The worms are rotated simultaneously, e.g. by a single stepping motor and a toothed belt engaging a pulley or by two separate stepping motors. For the purpose of reducing inertia, each worm is formed together with the driving pulley by moulding a layer of plastics material on a metal core tube which is formed with a shallow groove of coarse pitch to anchor the plastics layer. Each nut, also of plastics material, is formed with a series of axial notches which define an equal number of elastic sectors which allow any play on the worm due to wear to be taken up.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: March 17, 1987
    Assignee: Ing. C. Olivetti & C., S.p.A.
    Inventor: Giuseppe Coli
  • Patent number: 4631974
    Abstract: A polymeric split sprocket wheel is provided having two mating portions that, when joined, form a split line at the junction of those portions, two side faces, a toothed outer rim and a central axial bore, and which is designed to be mounted on a relatively immobile yet rotatable keyed shaft, being secured thereon by means of a tripartite apparatus comprised of a captive slotted keyway molded into the central axial bore of the wheel, a circular band clamp capable of exerting a uniform degree of force all around the axial hub, and a plurality of wedge dog assemblies which join the wheel together along the split line by means of a plurality of wedge dog clamps which straddle the split line, are inserted into tapered receptacles, and are fixed to the wheel by fastening means.
    Type: Grant
    Filed: November 8, 1985
    Date of Patent: December 30, 1986
    Assignee: Envirex, Inc.
    Inventors: James H. Wiegand, Thomas J. Casper
  • Patent number: 4616164
    Abstract: A feedback potentiometer type servoactuator having a plastic housing shell with small high RPM low voltage motor and non-metallic gear reduction train for driving an output shaft. The shell and cover plate provide structural support for gear journalling and the cover plate has an electrically resistive plastic strip baked onto the inside of the cover. Contacts mounted on the output gear for movement therewith wipe the resistive strip to provide variable resistance for an output shaft position feedback signal. The motor pinion and first stage reduction gears are made of urethane thermoplastic elastomer, the second stage gears of acetal plastic and the final gears are formed of 30% glass fiber filled polyester plastic for providing quiet running and long gear life.
    Type: Grant
    Filed: July 3, 1985
    Date of Patent: October 7, 1986
    Assignee: Eaton Corporation
    Inventors: Andrew A. Kenny, Daniel C. Stahly, Dennis DeVera
  • Patent number: 4601684
    Abstract: A belt-drive assembly for use on air-moving systems in corrosive atmospheres comprising a larger non-metallic driven sheave in conjunction with a smaller metallic driver sheave wherein the metallic sheave may be located in a vented enclosure is disclosed. This arrangement prevents corrosion of the drive system and prolongs belt life.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: July 22, 1986
    Assignee: Baltimore Aircoil Company, Inc.
    Inventors: David F. Geary, Edward N. Schinner, George R. Shriver
  • Patent number: 4589860
    Abstract: Gear for chain drives comprising a gear body of cast material having a hub section, a gear rim section with spur teeth, and a web section joining said hub and gear rim sections, and a ring plate of metal embedded in the web section, the outer edge of said plate being near the bottom of the areas between the spur teeth and having axial openings filled with casting material around its periphery, said ring plate having at its outer radial edge, radially outwardly directed projections, which are located in each case in a tooth, and which are embedded in the casting material of the gear body, said projections extending beyond the bottom of the spaces between adjacent spur teeth, and an axial opening formed in the ring plate adjacent each projection and radially below it.
    Type: Grant
    Filed: May 31, 1984
    Date of Patent: May 20, 1986
    Assignee: SKF Kugellagerfabriken GmbH
    Inventors: Manfred Brandenstein, Roland Haas, Gerhard Herrmann, Herbert Dobhan, Rudiger Hans
  • Patent number: 4512292
    Abstract: A gear drive for driving accessories such as an oil pump for a two-cycle engine (10) includes a worm member (25) mounted on the crankshaft (14) of the engine. The worm member (25), formed of a low friction plastic material such as nylon impregnated with molybdenum disulfide, engages a worm gear (24) mounted on the engine (10) to drive the oil pump (21).
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: April 23, 1985
    Assignee: Brunswick Corporation
    Inventor: James M. Hundertmark
  • Patent number: 4472164
    Abstract: A sprocket wheel for a tracked vehicle, the sprocket wheel being in the form of an annular body having teeth integrally moulded of elastomeric material, the teeth including metal inserts moulded therein and providing track engaging surfaces in the inter-tooth valleys about the sprocket wheel.
    Type: Grant
    Filed: April 27, 1981
    Date of Patent: September 18, 1984
    Assignee: Canadian Foremost, Ltd.
    Inventors: Allen A. Pusch, Russ J. Ewert
  • Patent number: 4463831
    Abstract: An improved spring wound prime mover capable of use with toys is provided. A plastic resin housing member comprises a pair of housing shells having complementary locking pawls and keeper members to permit a snap together assembly. The housing member further supports a spring member that can be selectively connected to a gear train assembly having a first and second gear ratio. The first gear ratio includes gears with a higher degree of mechanical strength than those engaged in the second gear ratio whereby a durable gear transmission is provided that can run smooth for driving the vehicle.
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: August 7, 1984
    Assignee: Takara Co., Ltd.
    Inventor: Hiroshi Wakase
  • Patent number: 4458547
    Abstract: An improved non-metallic sprocket, such as the phenolic laminate type, one improvement consisting of sprocket teeth molded from continuous layers of material laminated in a corrugated, sprocket tooth forming construction about the periphery of the sprocket. Another improvement consists of the inclusion of a non-metallic hub fashioned from a length of resin pre-impregnated material, in particular, fiberglass cloth, wound into a tube. During the molding of the sprocket the layers of material forming the tube are laminated into a solid hub.
    Type: Grant
    Filed: November 17, 1981
    Date of Patent: July 10, 1984
    Assignee: Resinoid Engineering Corporation
    Inventor: Paul E. Fina
  • Patent number: 4433964
    Abstract: Lightweight composite timing gears are provided to decrease fuel consumption, attenuate noise, and permit increased speed of operation.
    Type: Grant
    Filed: June 11, 1982
    Date of Patent: February 28, 1984
    Assignee: Standard Oil Company
    Inventors: Matthew W. Holtzberg, Steven J. Henke, Lawrence D. Spaulding
  • Patent number: 4326849
    Abstract: A sprocket-wheel, gear-wheel or like wheel, substantially manufactured of a synthetic material, comprising a hub which is divided along a plane which lies perpendicular to the center line of the hub-boring, said hub parts being provided with adjacent recesses for jointly accommodating a toothed ring member and being affixed to one another by bolts or the like to clamp the toothed ring member therebetween.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: April 27, 1982
    Assignee: M.C.C. Nederland B.V.
    Inventor: George J. Van Zijderveld
  • Patent number: 4237175
    Abstract: A carbon-filament reinforced gear material of laminated structure has layers of carbon filaments. The gear material includes a plurality of circular fabrics each having warps and wefts composed of a plurality of carbon filaments. The circular fabrics are laminated one on another such that the carbon filaments of their warps and wefts are substantially equiangularly spaced from those of another fabric about a common axis. The fabrics thus laminated are bound into a unitary structure by means of a binding agent of a thermosetting resin. A method for preparing the carbon-filament reinforced gear material includes the step of loosening the woven fabrics, each of which has such warps and wefts as are composed of the carbon filaments bundled into strands by means of a binding agent, by brushing the plain weave fabrics while applying thereto a binding agent so that the filaments in each of the strands may be substantially equidistantly separated from one another to make thinner and finer fabrics.
    Type: Grant
    Filed: June 9, 1978
    Date of Patent: December 2, 1980
    Inventor: Tuguo Kobayashi
  • Patent number: 4193310
    Abstract: This invention relates to a two piece plastic idler pulley formed of identical portions including a hub, a web and a rim with identical fastening means on the two half portions which permit the two portions to be joined together as the idler pulley. The hub of the idler pulley has a through bore which is inversely tapered whereby the hub will flex when subjected to a workload and will capture the lubricant internally of the bore. The rim carries diverging means which extend radially and laterally outwardly from the rim to insure proper seating of power transmission means such as a belt. The diverging means also is capable of engaging the power transmission belt when it is inadvertently seated on the hub to move the belt into seated relationship on the rim for proper operation of the device.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: March 18, 1980
    Assignee: Illinois Tool Works Inc.
    Inventors: David C. Boyer, Arthur J. Danko, William E. Ruehl
  • Patent number: 4167127
    Abstract: In lieu of a pair of bevel gears which mesh to rotate about axes inclined to one another, each gear is carried on a cylindrical base having a boss extending from one end and co-axial with the base. Each tooth is integral with both the base and the boss and the adjacent walls of adjacent teeth are parallel for portion of their respective lengths such that the teeth are bulbous. Point engagement exists between the teeth. For a given pair of gears the angle between the axis of rotation can be widely varied.
    Type: Grant
    Filed: December 12, 1977
    Date of Patent: September 11, 1979
    Assignee: Hills Industries Limited
    Inventor: Ronald J. Calvert
  • Patent number: 4144773
    Abstract: A bicycle sprocket wheel comprises a toothed outer annular member molded of a tough nylon plastic and a centrally disposed metal spider having a plurality of radial arms attached to the sides of the annular member to add structural rigidity thereto. The teeth of the annular member are formed with straight front and back faces and with sharp corners at the roots thereof. Such a construction reduces the cost of the mold used for molding the annular member since the cavity needed therein for the teeth can be simply machined by use of straight and circular cuts. The inner radial edge of the annular member is shaped by an insert in the mold to form sets of circumferentially spaced arcs, the arcs of each set having a common radius different from the other sets to accomodate spiders having arms of different radial lengths.
    Type: Grant
    Filed: July 25, 1977
    Date of Patent: March 20, 1979
    Inventor: Lyle F. Addicks
  • Patent number: 4143973
    Abstract: A composite gear of metal and plastic is provided and specifically a composite ring gear for a cement mixer. The ring gear for rotating the mixing drum of a cement mixer is commonly formed by stamping teeth in a metal flange circumjacent an intermediate portion of the mixing drum. Such gears have been noisy and lack impact resistance. The new ring gear comprises a metal flange to which is affixed a plurality of arcuate gear segments of a plastic material having gear teeth formed therein. The teeth of the plastic segments mesh with a drive pinion gear. The composite gear is much quieter and is also more impact resistant during operation. The segments can also be inexpensively and readily replaced, if necessary.
    Type: Grant
    Filed: November 28, 1977
    Date of Patent: March 13, 1979
    Assignee: The J. B. Foote Foundry Co.
    Inventor: Hans Hauser
  • Patent number: 4110054
    Abstract: A gear, end plate, or the like, is formed from a hard, tough plastic such as polyurethane and is locked onto a supporting shaft by means of a clamp engaging an integral annular hub formed on one side of the gear. The clamp is in the form of a metal band, the ends of which are provided with a nut and screw by means of which the band may be tightened to apply clamping pressure.
    Type: Grant
    Filed: October 4, 1976
    Date of Patent: August 29, 1978
    Assignee: Flexothane Corporation
    Inventor: Carl A. Moeller, Jr.
  • Patent number: 4037483
    Abstract: An operator for hinged windows in which all components are molded from polymeric material. The worm gear, sector gear and link are molded glass-filled nylon and the housing, crank and other components are molded ABS. The worm gear tooth has a top land to root axial dimension ratio of 4:10 and each face of the tooth is inclined at a 20.degree. angle. The sector gear has a pitch diameter to thickness ratio of 5:1. The link is provided with a stiffening rib.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: July 26, 1977
    Inventor: Nestor M. Nadal