Motors: expansible chamber type – With motive fluid valve – Independent control of bypass between opposed working chambers
Patent
1979-11-16
1982-03-23
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Independent control of bypass between opposed working chambers
91438, 91441, 91451, 91464, 13759615, 13762563, F15B 13042
Patent
active
043206913
ABSTRACT:
A hydraulic system (9) includes a hydraulic motor (10), a main control valve (17) for controlling said motor (10), a make-up valve (78,79) operatively associated with said main control valve (17) and a vent line (93,94,95,99) for selectively venting said make-up valve (78,79). In such hydraulic systems, and in particular, in prior art hydraulic systems used to raise and lower a load, there is always the possibility that should hydraulic pressure not be maintained in the vent line the make-up valve could come open and the load could unexpectedly move. Such a situation could occur with, for example, air trapped in said vent line and the simultaneous failure of a pump of the system. The present invention solves this problem by providing pressure maintaining arrangement (200) in fluid communication with said vent line (93,94,95,99). The pressure maintaining arrangement (200) insures that any air trapped in the vent line (93,94,95,99) will be compressed to maintain the pressure in the vent line (93,94,95,99) at a predetermined level. Thus, should the hydraulic pump (13,26) be inoperative, a load will not unexpectedly move due to the compression of air trapped in said vent line (93,94,95,99).
REFERENCES:
patent: 2219967 (1940-10-01), Thiry
patent: 2597418 (1952-05-01), Westbury et al.
patent: 3049101 (1962-08-01), Ruhl
patent: 3433131 (1969-03-01), Soyland et al.
patent: 3608435 (1971-09-01), Conabfe et al.
patent: 3709103 (1973-01-01), Dukhovny et al.
patent: 3840049 (1974-10-01), Field, Jr.
patent: 3862643 (1975-01-01), Dezflan et al.
patent: 3943825 (1976-03-01), Bianchetta et al.
Caterpillar Tractor Co.
Cohen Irwin C.
LandOfFree
Hydraulic load lifting system with hydraulic surcharge to make u does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic load lifting system with hydraulic surcharge to make u, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic load lifting system with hydraulic surcharge to make u will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1646932