Braking fluid pressure fault alarm device

Details Braking fluid pressure fault alarm device Braking fluid pressure fault alarm device

1976-10-14

1978-06-27

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

188151A, 200 82D, 303 6C, B60T 826, B60T 1134, B60T 1718

Patent

active

040978419

ABSTRACT:
A fault alarm device for a vehicle dual brake system including front and rear master cylinders, front and rear wheel cylinders and a proportioning valve which functions to develop proportioned rear wheel braking fluid pressure at a reduced rate relative to the rear wheel braking fluid pressure from the rear master cylinder. The fault alarm device comprises a fault alarm circuit for indicating the fault in the dual brake system when energized, and a control valve interposed between the master cylinders and the wheel cylinders and associated with the proportioning valve. The control valve includes a body, a stepped cylinder formed in the body, a stepped piston slidably inserted in the stepped cylinder, and a sleeve slidably interposed between the stepped cylinder and piston. The alarm device further comprises a switch engaged with the stepped piston for energizing the alarm circuit in response to the sliding movement of the stepped piston from its neutral position. Thus, the stepped piston can be urged to slide from the neutral position under the force of the front wheel braking fluid pressure to insure indication of the fault in the dual brake system, even if the proportioned rear wheel braking fluid pressure between the proportioning valve and the rear wheel cylinders does not arise as a result of increase in the rear wheel braking fluid pressure from the rear master cylinder due to fault in the proportioning valve.

REFERENCES:
patent: 3586384 (1971-06-01), Falk
patent: 3661426 (1972-05-01), Tan
patent: 3674954 (1972-07-01), Kish et al.
patent: 3700286 (1972-10-01), Bueler
patent: 3708211 (1973-01-01), Bueler
patent: 3717382 (1973-02-01), Ayers, Jr.
patent: 3772672 (1973-11-01), Adahan
patent: 3836204 (1974-09-01), Van Wicklin, Jr.

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