Fluid-pressure and analogous brake systems – Releasing – Motor
Patent
1980-02-04
1981-12-29
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Releasing
Motor
188352, 303 10, B60T 1322
Patent
active
043079172
ABSTRACT:
A brake system for a vehicle having spring applied, pressure releasable brakes (10) including a manual pump (28), a terminal board (14) having ports (16,18,20) terminating the system fluid pressure line (22), the brake pressure line (12) and the pump pressure line (76), and a U-tube (120) connecting two of the ports on the terminal board. In the alternative embodiment, an emergency brake release system for a vehicle having spring applied, pressure releasable brake (130) including a pump (166), and a control valve (140) for selectively connecting the pump (166) to the brakes (130) while connecting the fluid pressure supply line (133) to a reservoir return line (136). The valve (140) includes modes for connecting the brakes (130) to the supply line (134) through an orifice (192), and a brake outlet line (138) to the reservoir return line (136) for bleeding the brakes (130), and for isolating the supply line (134) while venting the brake line (133), for checking system pressure. A limit switch (200) prevents engine starting while the brakes (130) are manually released.
REFERENCES:
patent: 3272566 (1966-09-01), Clack
patent: 3841714 (1974-10-01), Schultz
patent: 3932003 (1976-01-01), McGregor
patent: 3954304 (1976-05-01), Engle
"Design Concepts of the New John Deere JD750/755 Dual Path Hydrostatic Crawler Tractors", Society of Automotive Engineers, Earthmoving Industry Conference, Central Illinois Section, Peoria, Illinois, Apr. 26-28, 1976, C. L. Braun, John Deere Dubuque Works.
Hasselbacher Roland E.
Shuler Lucien B.
Butler Douglas C.
Caterpillar Tractor Co.
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