Control valve lock for a vehicle air brake system

Details Control valve lock for a vehicle air brake system Control valve lock for a vehicle air brake system

1996-07-11

1997-11-18

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Locks

188353, B60T 1716

Patent

active

056880278

ABSTRACT:
A control valve lock for a vehicle air brake system is described whereby to secure the parking brakes of the vehicle in an engaged locked position. The lock is securable to the valve actuating rod on the dashboard control valve and is comprised essentially of a block-like base member to which is secured a large actuating knob. A lock cylinder extends through a portion of the knob and the base member and aligns internal locking cavities between the connecting shaft of the knob and the base member whereby the locking dog of the lock cylinder can engage in the cavities to secure the knob in a retracted position whereby to lock the brakes of the vehicle. In order to unlock the brakes, it is necessary to insert a key in the key cylinder to liberate the knob to permit it to be pushed inwardly whereby the dashboard control valve can supply air to the parking brake cylinder to release the brakes.

REFERENCES:
patent: 3625573 (1971-12-01), Conn
patent: 3998495 (1976-12-01), Maxwell et al.
patent: 4040675 (1977-08-01), Richmond et al.
patent: 4881615 (1989-11-01), Conway

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