Title: Actuator assemblies for vehicle brakes

Abstract: An actuator assembly for a vehicle brake includes three axially aligned pistons, a first actuating piston for applying the brake hydraulically during normal service braking; a modulator piston movable for anti-skid purposes between a first position in which an inlet valve controlling the supply of fluid to the first actuating piston is open, and a second position in which the inlet valve is closed; and a second actuating piston resiliently urged through the modulator piston to engage the first actuating piston to apply the brake for parking purposes but normally held out of engagement by fluid pressure in a chamber formed between the modulator piston and the second actuating piston, the pressure in the chamber also holding the modulator piston in the first position.

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Inventors: Ingram, Brian (Balsall Common, EN)
Harries, David Anthony (Shirley, EN)

Application Number: 395557
Filing Date: 1973-09-10
Publication_date: 1976-05-04
Assignee: Girling Limited (Birmingham, EN)
Primary Class(es): 303/115.5 188/170, 303/10, 303/13, 303/122.02
Other Classes:
US Patent Ref:

3547234	Dec, 1970	Cummins et al.	188/170.
3613839	Oct, 1971	MacDuff	188/170.
3659905	May, 1972	Goulish	303/21.
3722960	Mar, 1973	Menar	303/21.
3724915	Apr, 1973	MacDuff	303/21.
3767271	Oct, 1973	Grosseau	303/21.
3788710	Jan, 1974	Grunberg et al.	303/21.

Other Refs:
Primary Examiner: Blix, Trygve M.
Assistant Examiner: Butler, Douglas C.
Attorney: Scrivener Parker Scrivener and Clarke