Parking brake control valve dual actuating device
Patent 4979783 Issued on December 25, 1990. Estimated Expiration Date: 
July 12, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 12, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2164692 2310802 2366173 2725129 3136399 3635317 Interlock mechanism Wheelchair brake assembly Emergency and parking brake arrangement in vehicle braking system Shift lever activated parking brake Patent #: 4875563 InventorAssigneeApplicationNo. 378740 filed on 07/12/1989US Classes:303/9.61, Separate and simultaneous control74/479.01, Multiple controlling elements for single controlled element192/219.4, Emergency or parking brake303/10, WITH PUMP303/13MULTIPLE CONTROLExaminersPrimary: Graham, Matthew C.Attorney, Agent or FirmForeign Patent References
International ClassesB60T 015/16B60T 013/18 AbstractA control valve for a vehicle parking brake system is controlled by a pair of camming mechanisms, one of which is controlled by the shift lever of the vehicle automatic transmission and the other of which is controlled by a manual control knob in the vehicle operator's compartment. Camming mechanisms control the valve such that the parking brakes on the vehicle are always applied when the shift lever is disposed in the "Park" position, but the vehicle parking brakes can be applied or released manually by manipulation of the control knob when the shift lever is placed in one of the other positions other than the "Park" position along the shift quandrant of the automatic transmission.Field of SearchSeparate and simultaneous controlSectional train Multiple brake valves MULTIPLE CONTROL Fluid and electric Load Having multiple pistons affecting fluid flow Equalizing Fluid-pressure retracting Multiple Safety devices Train FLEXIBLE ACTUATOR (E.G., BOWDEN WIRE; CHAIN) Valves with separate, correlated, actuators Interlocked | |
