Title: Skid control system embodying fail safe bypass

Abstract: A vehicular skid control system for relieving the brake pressure when an incipient skid condition is sensed. The system includes a combined check and bleed valve between the master cylinder and rear wheel brakes, a modulator assembly actuable by a ancillary source of fluid pressure, a fal safe bypass valve for communicating unmodulated master cylinder pressure directly to the rear brakes upon failure of the ancillary pressure source, and a regulator provided in the circuit connecting the source of ancillary fluid with the expansion chamber for maintaining at least a predetermind pressure in the circuit. Certain of the elements of the system may be automatically cycled each time the vehicle engine is started and stopped.

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Other info:

Inventors: Atkins, Thomas M. (Ann Arbor, MI, US)

Application Number: 391463
Filing Date: 1973-08-24
Publication_date: 1976-06-15
Assignee: Kelsey-Hayes Company (Romulus, MI)
Primary Class(es): 303/122.14 188/181A, 303/10, 303/115.4
Other Classes:
US Patent Ref:

3515440	Jun, 1970	Every et al.	303/21.
3602554	Aug, 1971	Ichimura et al.	303/21.
3610701	Oct, 1971	Riordan	303/21.
3672731	Jun, 1972	Koivunen	303/21.
3747990	Jul, 1973	Tangay	303/21.
3752537	Aug, 1973	Ochiai	303/21.
3810680	May, 1974	Schenk	303/21.
3813130	May, 1974	Inada	303/21.
3829169	Aug, 1974	Inada	303/21.

Other Refs:
Primary Examiner: Blix, Trygve M.
Assistant Examiner: Butler, Douglas C.
Attorney: Harness, Dickey & Pierce