Title: Anti-skid device including a gear-driven cam pumping unit with fail-safe features

Abstract: A motor vehicle wheel engages a gear which drives a multistage cam which actuates a system of hydraulic valves and pistons. A pressure-sensitive spool valve detects when the hydraulic pressure in the brake system exceeds the value which causes the wheel to enter the skid mode. The hydraulic pressure from the brake system passes through the pressure-sensitive valve to the system of hydraulic valves and pistons operated by the cam. The outlet of the hydraulic valve and piston system goes to the brake cylinder in the wheel. During the skid mode, a valve in the hydraulic valve and piston system closes and a cam action on one of the pistons in the system causes a pumping pressure to be applied to the brake cylinder. This anti-skid device further includes two fail-safe features to protect against system failure.

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Inventors: Stage, Jack W. (San Rafael, CA, US)

Application Number: 368429
Filing Date: 1973-06-08
Publication_date: 1976-04-20
Assignee:
Primary Class(es): 303/116.3 74/13, 188/181A, 188/DIG1, 303/10, 303/61
Other Classes:
US Patent Ref:

2483205	Sep, 1949	Jones	303/61.
3046060	Jul, 1962	Stager et al.	73/514.
3276822	Oct, 1966	Lister et al.	303/61.
3325226	Jun, 1967	Perrino	303/49.
3466098	Sep, 1969	Pieren et al.	303/61.
3503653	Mar, 1970	Davis et al.	188/181.
3524684	Aug, 1970	Skoyles	303/21.
3574416	Apr, 1971	Skoyles	188/181.
3829166	Aug, 1974	Menar et al.	303/10.

Other Refs:
Primary Examiner: Reger, Duane A.
Assistant Examiner: Butler, Douglas C.
Attorney: Dyson; Edward E., Byrne; John J.