Parking brake and transmission interlock system.

摘要

An interlock system (10) contains an interlock valve (18) which reacts when fluid pressure is insufficient to disengage the parking brake (20). The valve (18) senses the loss of pressure and causes a plunger to interfere with the movement of a control rod (40) which moves to shift the transmission (16). This interference results in noticeable resistance to the movement of the control rod (40). The vehicle can then be moved with the parking brake (20) engaged but an operator will be alerted that the parking brake (20) is engaged to prevent damage to the brake (20).