F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/72
F15B 21/08 (2006.01) B60R 16/00 (2006.01) F15B 21/00 (2006.01)
Patent
CA 1279554
AUXILIARY COUPLER PRESSURE RELIEF HYDRAULIC SYSTEM ABSTRACT OF THE DISCLOSURE An auxiliary coupler pressure relief hydraulic system (110) for off-road vehicles including a battery (130), an engine (114), an engine ignition system (134), a reservoir (116) of hydraulic fluid, and a pump (112) for providing hydraulic fluid under pressure. Quick couplers (128) couple hydraulic fluid to an attachment (126) mounted to the vehicle. An electro-hydraulic spool valve (118) is connected to a source (148) of pilot pressure and controls the flow of hydraulic fluid to the quick couplers (128) in response to valve actuating signals. Forward and reverse auxiliary control switches (144, 146) are coupled to the spool valve (118) and provide valve actuating signals resulting in fluid flow to the quick couplers (128) in forward and reverse directions. Also included is an ignition switch (132) having RUN, OFF and RELIEF positions. When switched from its RUN position to its RELIEF position, the ignition switch (132) provides pressure relief valve (118) actuating signals which stroke the spool valve (118) and bleed pressure trapped between the valve (118) and the quick couplers (128) while the engine RPM is decreasing to zero and pilot pressure is still available.
602952
Haeder Thomas Q.
Shelbourn William C.
Clark Equipment Company
Riches Mckenzie & Herbert Llp
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