Tow hook activated brake release method and apparatus

Details Tow hook activated brake release method and apparatus Tow hook activated brake release method and apparatus

1991-04-24

1992-05-12

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Releasing

Motor

188151A, 188170, 303 976, B60T 1322

Patent

active

051121131

ABSTRACT:
A brake release apparatus for a vehicle equipped with a spring-applied hydraulically-released brake system. The apparatus includes a tow hook attached to the vehicle and operably connected to a hydraulic cylinder so that a towing force on the tow hook actuates the hydraulic cylinder. The hydraulic cylinder is connected to transmit a hydraulic pressure to the vehicle brakes, releasing the brakes to permit towing. A spring returns the tow hook to its original position when the towing force is removed, thereby permitting the spring-activated brakes to be reapplied.

REFERENCES:
patent: 3570633 (1971-03-01), Garnett
patent: 3650570 (1972-03-01), Meeks
patent: 4505355 (1985-03-01), Scheurenberg et al.
patent: 4576418 (1986-03-01), Holzinger et al.
patent: 4813518 (1989-03-01), Akiuama et al.
patent: 4893879 (1990-01-01), Middelhoven et al.
patent: 4989703 (1991-02-01), Forsyth et al.

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