Motors: expansible chamber type – With motive fluid valve – Contracting chamber exhaust valve controlled by expanding...
Patent
1982-02-08
1984-08-21
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Contracting chamber exhaust valve controlled by expanding...
60460, 91445, 91447, 91452, 91468, 1375992, 137601, 13763015, F15B 13042, F16K 1518
Patent
active
044663366
ABSTRACT:
A counterbalance valve connects a source of hydraulic fluid to a power piston-cylinder unit for positioning and/or holding a load such as a pivoted bucket arm of earth moving equipment. A directional control valve is operable to reverse the supply connection to the cylinder unit and to operatively close the connections thereto to hydraulically lock the cylinder unit and attached load in place, with a highly restrictive bleed passageway. The counterbalance valve has a first valved passageway between a pair of ports which includes a check valve to provide one directional flow between the two ports. A dual poppet valve unit includes a pair of parallel passageways in parallel with each other and with the first passageway. The double poppet valve includes a main poppet valve having a valve stem with a piston head and a spaced member of a larger effective area. Under abnormal pressure conditions, a controlled opening of the main poppet valve unit occurs because of the differential area and releases the high pressure condition through the bleed passageway. The stem includes a central opening within which a second poppet valve stem is located. A pilot piston and chamber is releasably mounted in alignment with the poppet valve stems and is connected via a restricted passageway to sense the pressure in the power cylinder to sequentially open the poppet valves. The restricted flow of the small poppet creates controlled slow lowering of the bucket. The diameter of piston and chamber may change to control the system characteristic.
REFERENCES:
patent: 2360987 (1944-10-01), Temple
patent: 3623509 (1971-11-01), Sesseler
patent: 4078475 (1978-03-01), Fillion
patent: 4244275 (1981-01-01), Smilges
Broome J. Wesley
Witt Richard W.
Lakeland Hydraulics, Inc.
Look Edward K.
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