Eccentric And Strap Drive, Shiftable Eccentric Patents (Class 74/835)
  • Patent number: 6105447
    Abstract: The invention provides an eccentric wherein the amplitude of reciprocation, or throw, is continuously variable, during operation, from zero to a maximum. This represents an improvement over adjustable eccentric devices in the prior art insofar as the conventional devices needed to be shut down and physically reconfigured to adjust the throw of the reciprocating arm. The invention will be of use in many functions, including precision farming applications.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: August 22, 2000
    Inventor: Orville J. Linn
  • Patent number: 5090081
    Abstract: A windshield wiper includes a first pin connected to a drive mechanism, a primary lever supported by the first pin, a second pin mounted to the primary pin, a wiper arm fixedly mounted to the second pin, the primary lever being rotated about the second pin by the drive mechanism to cause reciprocating motion of the wiper arm in an arcuate path, a first cam member rotatable about the first pin, a second cam member rotatable about the second pin, and a secondary lever for connecting the first cam member and the second cam member together. The second cam member is so rotated as to allow a center of the first cam member to move relative to a center of the first pin, thereby changing the effective length of the primary lever such that the arcuate path of the wiper arm is changed. A wheel gear is used to rotate the second cam member through a predetermined angle. The second cam member is rotatably supported by a stationary member. A gear portion is meshed with the wheel gear and rotated by the motor.
    Type: Grant
    Filed: September 12, 1990
    Date of Patent: February 25, 1992
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Tokihiko Yamamoto, Ryoichi Fukumoto, Masao Ohhashi, Kazuhide Itagaki, Kazuhiro Sumiya
  • Patent number: 4914981
    Abstract: An intermediate transmission with a variable input-to-output phase relationship for converting rotary motion to reciprocal motion includes a drive shaft having a main portion and an eccentric crank pin, an externally toothed ring with a plurality of circular bores rotatably mounted on the main shaft portion, a control member for rotatably adjusting and locking the ring in selected positions, a disc having an axially extending collar rotatably mounted on the eccentric pin and carrying a plurality of rollers each disposed to roll on the inner surfaces of the respective circular bores, the distance between each roller axis and the respective bore center being equal to the distance between the main shaft axis and the eccentric pin axis, an externally toothed satellite gear mounted on the collar, and an internally toothed sunwheel engaged by the satellite and rotatably mounted in a frame whereby the sunwheel rotates at the reduced integral speed ratio of 1-.sup.Z 2/.sub.
    Type: Grant
    Filed: May 3, 1989
    Date of Patent: April 10, 1990
    Assignee: Man Roland Druckmaschinen AG
    Inventors: Peter Hummel, Roland Holl
  • Patent number: 4682532
    Abstract: A variable-stroke, constant-compression, reversible radial pump, the stroke of which may be infinitely adjusted by means of a variable-throw eccentric from a normal-cycle maximum through zero to a reverse-cycle maximum, and the compression of which is maintained constant through the use of a variable-geometry cylinder-head assembly. The cylinder geometry varies when the cylinder head is raised and lowered by means of a synchronized screw arrangement which is coupled through a gear set to the variable-throw eccentric. The variable throw-eccentric comprises a hollow input shaft which is drilled and threaded diametrically. A threaded, splined adjustment shaft is screwed into the threaded diametric hole in the input shaft. Each end of the adjustment shaft is mounted in bearing races which are anchored at diametrically opposed points in a connecting-rod journal.
    Type: Grant
    Filed: January 7, 1985
    Date of Patent: July 28, 1987
    Inventor: Erik E. Erlandson
  • Patent number: 4558266
    Abstract: A workpiece transfer bar is reciprocated by a rack driven by a pinion which is driven by a servomotor through an eccentric arm. A computer is used to set rates of acceleration and deceleration, a maximum speed, etc. in accordance with the origin of the transfer bar, stroke thereof etc.
    Type: Grant
    Filed: March 15, 1984
    Date of Patent: December 10, 1985
    Assignee: Toshiba Kikai Kabushiki Kaisha
    Inventors: Tamotsu Sasaki, Yutaka Tsuchiya
  • Patent number: 4538336
    Abstract: This invention is a method and apparatus for quickly and infinitely adjusting the degree of eccentricity of a rotating member wherein a first rotating member is provided with interlocking means to a second member carrying means to rotate at an adjustable off-center relationship to the primary radial center of the initial rotating member. The adjustment is accomplished by an interconnecting tapered fit between the two members utilizing a critical tapered angle which is capable of locking in position by the taper itself but yet which can release when desired for adjustment.
    Type: Grant
    Filed: December 9, 1982
    Date of Patent: September 3, 1985
    Inventor: Michael Oliver
  • Patent number: 4485693
    Abstract: A vibrating apparatus e.g. for shaking the forming wire of a paper machine, comprising a body (1) and a drive shaft (2) rotatably mounted in the body. The drive shaft supports an eccentric bushing (3) displaceable along but nonrotatably fixed to said drive shaft. A reciprocating rod (9) positioned transversely with respect to the drive shaft is provided with a ring-shaped end (10) rotatably mounted around an outer mantle surface of said bushing stationary in the axial direction (D) of said bushing. The apparatus further comprises adjusting means (11-20) for displacing said bushing along the drive shaft in its axial direction in order to adjust the eccentricity between the drive shaft and the ring-shaped end of the reciprocating rod.
    Type: Grant
    Filed: August 10, 1981
    Date of Patent: December 4, 1984
    Assignee: Oy Tampella AB
    Inventor: Hannu Heikkila
  • Patent number: 4311065
    Abstract: The drive mechanism for a paper tape punch and reader assembly utilizes tape drive assemblies which move the paper tape in response to the application of continuous periodic motion and control signals. The periodic motion serves to oscillate a rocker plate between first and second limits and the control signls serve to selectively engage and disengage a detent which effects coupling between the drive shaft and the source of periodic motion. The periodic motion is imparted to the drive assembly by a connecting link which in turn is driven by an adjustable eccentric.The eccentric comprises a pulley plate which is fixed to a shaft. A circular body is adjustably movable with respect to the pulley plate and is arranged to engage the race of a ball bearing assembly which further comprises balls and a retaining ring. The connecting link has a circular opening which provides a snug fit to the exterior of the retaining ring.
    Type: Grant
    Filed: April 27, 1979
    Date of Patent: January 19, 1982
    Assignee: Teletype Corporation
    Inventors: Jerome L. DeBoo, David G. Geis
  • Patent number: 4261228
    Abstract: A stroke adjustment for reciprocating mechanisms which includes an external adjusting wheel to vary internally the longitudinal position of a carrier through an interconnected shaft and gear. A butterfly arm is pivotally connected to the power shaft and is pivoted by the carrier to raise or lower one end of a connected crank to vary the length of the piston stroke by changing the eccentricity of the crank.
    Type: Grant
    Filed: December 13, 1978
    Date of Patent: April 14, 1981
    Inventor: Joseph A. Eagan, Sr.
  • Patent number: 4249424
    Abstract: The invention achieves a method and a device for providing infinitely variable adjustment to the throw of an eccentric from zero to a maximum while the eccentric is permitted to continuously travel in angular motion. This is achieved by two juxtaposed and eccentric members mounted on a drive shaft, one (the outer) overriding, the other (the inner). The eccentric members may be relatively positioned by a control shaft, which extends coaxially through the drive shaft, and gearingly mates with the outer eccentric member. The outer surface of the outer eccentric can be arranged (by relatively positioning the outer and inner eccentric members) to trace the loci of points of a circle, whereupon no reciprocation takes place, or of a family of ellipses of varying eccentricity, whereby reciprocation is achieved in correspondence to the relative eccentricity in the path of travel of the outer surface.
    Type: Grant
    Filed: August 7, 1978
    Date of Patent: February 10, 1981
    Inventor: William J. Glazier
  • Patent number: 4138904
    Abstract: A link drive mechanism for vertically moving the slide of a mechanical press comprises a power driven eccentric unit carried by a horizontal shaft arranged substantially vertically above the connecting means for the slide and having first and second adjacent eccentrics, a first eccentric strap carried by the first eccentric and extending downwardly therefrom and having first and second laterally arranged pivot connections, a first link pivotally connected between the first pivot connection and the connecting means for the slide, a second eccentric strap carried by the second eccentric and extending laterally therefrom, a substantially vertically extending fulcrum lever arranged laterally from the horizontal shaft and pivoted intermediate its ends and having one of its arms pivotally connected to the second eccentric strap, and a second link pivotally connected to the other arm of the fulcrum lever and to the second pivot connection of the first eccentric strap.
    Type: Grant
    Filed: July 20, 1977
    Date of Patent: February 13, 1979
    Assignee: Verson Allsteel Press Company
    Inventors: Tsuruo Otsuka, Jacob J. Zeilenga