Title: Mechanically and hydraulically operated brake actuator

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.

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Inventors: Crabtree, Norman (Worcester, EN)

Application Number: 627839
Filing Date: 1975-10-31
Publication_date: 1977-03-22
Assignee: Girling Limited (Birmingham, EN)
Primary Class(es): 188/326 74/110, 74/625, 188/106F, 188/106P, 188/343, 188/363, 192/75, 192/83
Other Classes:
US Patent Ref:

2166804	Jul, 1939	Dick	188/326.
2347366	Apr, 1944	Parnell	188/363.

Other Refs: 779,3831,253,5861,135,994

Jan, 1935	FR
Nov, 1971	UK
Dec, 1968	UK

Primary Examiner: Halvosa, George E. A.
Assistant Examiner:
Attorney: Scrivener, Parker, Scrivener and Clarke