Patents Examined by James J. Jones, Jr.
  • Hammer starting mechanism
    Patent number: 4418769
    Abstract: A starting mechanism for a reciprocating piston pneumatic hammer provides a passageway coupling a pneumatic piston subchamber to an exit port to exhaust pressurized pneumatic fluid from the subchamber during a start-up period. A pneumatic valve is provided to open the passageway as the hammer is started so as to create a pressure differential in the coupled piston subchamber, and thus prevent the piston from centering. The valve closes the passageway after the piston reciprocation has begun.
    Type: Grant
    Filed: March 12, 1981
    Date of Patent: December 6, 1983
    Assignee: Cooper Industries, Inc.
    Inventors: Robert R. Vincent, James T. Clemenson