Motors: expansible chamber type – With motive fluid valve – For double-acting motor
Patent
1992-05-26
1994-06-07
Michalsky, Gerald A.
Motors: expansible chamber type
With motive fluid valve
For double-acting motor
91434, 91465, 137596, 13762569, F15B 1304
Patent
active
053179536
ABSTRACT:
A valve control system for controlling the operation of a pressure fluid-activated device such as a hydraulic cylinder includes a valve housing having an internal, sealed valve chamber therein. A valve spool is slidably disposed for lengthwise movement within the valve chamber, the valve spool having a valve member for selectively admitting a pressure fluid through passages in the vale housing. A movable handle for manual operation of the valve is connected to the valve spool by a connecting mechanism, whereby movement of the handle causes lengthwise movement of the valve spool relative to the valve housing. A neutral-centering tactile feedback mechanism applies a return force to the handle when the handle is in an operative position. The return force varies in proportion to the pressure of the pressure fluid within the valve, which pressure actuates the device. The feedback mechanism ceases to apply the return force when the handle returns to a neutral position. The load, however, remains pressurized, permitting an arm or tool operated by a suitable device, such as a hydraulic cylinder, to remain in position. For example, an excavator arm could remain suspended in mid-air without need for the operator to hold the handle, providing enhanced convenience and safety.
REFERENCES:
patent: 2140037 (1938-12-01), Swisher
patent: 2617257 (1952-11-01), Douglas
patent: 2824447 (1958-02-01), Garrison
patent: 2919681 (1960-01-01), Schultz
patent: 3099289 (1963-07-01), Neilson et al.
patent: 3312246 (1967-04-01), Tam
patent: 3472264 (1969-10-01), Petry
patent: 3581771 (1971-06-01), Garrison et al.
patent: 3630234 (1971-12-01), Hoffman
patent: 3636978 (1972-01-01), Byers
patent: 3954149 (1976-05-01), Strauff
patent: 4123964 (1978-11-01), Strauff
patent: 4134418 (1979-01-01), Woodcock
patent: 4201116 (1980-05-01), Martin
patent: 4338965 (1982-07-01), Garnjost et al.
patent: 4456031 (1984-06-01), Taplin
patent: 4537220 (1985-08-01), Anderson
patent: 4606369 (1986-08-01), McKay
Electrohydraulic Valves and Servosystems, pp. 95-96, (undated).
Earth Tool Corporation
Michalsky Gerald A.
LandOfFree
Neutral-centering valve control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Neutral-centering valve control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neutral-centering valve control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-785924