Patents by Inventor Norman Crabtree

Norman Crabtree 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).

  • Mechanically and hydraulically operated brake actuator
    Patent number: 4013150
    Abstract: In an actuator assembly for a vehicle brake a follower member normally operated by a wedge to apply a brake comprises a pair of hydraulic pistons working in a common bore in a housing, and the housing is provided with a supply port communicating with a pressure space defined between the adjacent ends of the pistons which abut when the wedge is displaced, and with an abutment face with which the innermost piston is engageable when the wedge is in its retracted position and the pressure space is pressurized.
    Type: Grant
    Filed: October 31, 1975
    Date of Patent: March 22, 1977
    Assignee: Girling Limited
    Inventor: Norman Crabtree