Sensor Actuates Pawl-and-rachet Mechanism To Operate Shifter Patents (Class 474/105)
  • Belt tension adjustment mechanism
    Patent number: 5236397
    Abstract: A belt tension adjustment mechanism having a pivoting pulley support plate adapted to cooperate with a pivoting ratchet plate. The pulley support plate directly or indirectly anchors a belt to be tensioned. A tension spring is associated with the ratchet plate to bias the ratchet plate towards a position of increased belt tension. The ratchet plate includes a teeth and pawl arrangement for preventing the ratchet plate from spontaneous rotation to a position of reduced belt tension.
    Type: Grant
    Filed: May 3, 1991
    Date of Patent: August 17, 1993
    Assignee: Rover Mowers Limited
    Inventor: Douglas F. Green
  • Adjustable conveyor assembly for regular periodic transverse movement of a longitudinally moving conveyor belt
    Patent number: 4645066
    Abstract: A conveyor assembly having one of its conveyor rollers which is movable to change the angle of its axis to the conveyor direction for causing sideways movement of the conveyor belt. Movement of the roller is controlled by a linkage drivably connected to a ratchet nut riding on a threaded spindle to move one end of the roller sideways on a carriage. A linkage adjustment arrangement is provided to adjust the degree of driving engagement of the linkage with the ratchet nut.
    Type: Grant
    Filed: July 8, 1985
    Date of Patent: February 24, 1987
    Assignee: Northern Telecom Limited
    Inventor: Walter L. Richardson