Patents Represented by Law Firm Lanchantin, Jr., Charles E.
  • Patent number: 4746100
    Abstract: In order to overcome the disadvantage of overspinning of a winch drum when a disconnect device adjacent the drum is disengaged, a drag brake apparatus is provided for limitedly restricting the rotation of the drum when an actuator having a braking element is continually urged against the drum by a spring. A control mechanism includes a control lever assembly movable to operate a hydraulic valve assembly for the primary control of the winch drum, and movable to operate an associated valve for controllably directing pressurized fluid to the actuator for supplementing the spring force. Thus, a first drag brake mode can be attained for substantially freespool operation of the drum, and a second drag brake mode can be attained for controlled load dropping operation of the drum.
    Type: Grant
    Filed: December 24, 1986
    Date of Patent: May 24, 1988
    Assignee: Caterpillar Inc.
    Inventors: Richard G. Davenport, Duane R. Smith, R. Paul Cobb