Patents Assigned to Bullough Limited
  • Valve means for use in controlling operation of a hydraulic motor
    Patent number: 4175909
    Abstract: The control valve mechanism of, for example a hydraulic motor for a chain saw, includes a two-position spool having a hollow interior permanently connected to reservoir and a cylindrical wall formed with ports which are closed in one valve position and open in the other valve position. During movement of the spool into the motor-operating position, a lubricant passageway is opened before the motor is fully operational.
    Type: Grant
    Filed: July 25, 1977
    Date of Patent: November 27, 1979
    Assignee: Bullough Limited
    Inventor: Gordon D. White