Patents by Inventor John H. Hrabak

John H. Hrabak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Annular single piston brake arrangement
    Patent number: 4077500
    Abstract: An annular single piston brake arrangement is disclosed for selective holding engagement of a rotatable member of a drive train. The brake arrangement includes a support structure, an annular brake piston axially reciprocably and nonrotatably mounted within the support structure, a plurality of springs mounted intermediate the support structure and the brake piston for biasing it concentrically toward peripheral brake holding engagement of the rotatable member, a fluid retractor for holding the brake piston in a disengaged condition overcomingly against the action of the springs, and a fluid actuator for biasing the brake piston concentrically towards peripheral brake holding engagement of the rotatable member.
    Type: Grant
    Filed: November 26, 1976
    Date of Patent: March 7, 1978
    Assignee: Caterpillar Tractor Co.
    Inventors: Donald A. Hickman, Sr., John H. Hrabak, Paul C. Rosenberger