| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 161 | Hydraulic system | US542893 | 1975-01-22 | US3943824A | 1976-03-16 | Edward Horton Fletcher |
| An electro-hydraulic system for controlling a hydraulic function includes a pump and reservoir connected to the function through an electro-hydraulic control valve, a pair of pilot operated check valves normally preventing fluid flow from the function, a pilot passage between the pump and check valves to pressurize and open the check valves, an electro-hydraulic drain valve connected to the pilot passage, and control means for the control and drain valves. The control means is responsive to a feedback signal from the hydraulic function and an operator-controlled input signal within a predetermined range to close and open the drain and control valves, respectively. The control means may further require the presence of a second input signal, such as a simple reference signal or a signal provided in response to operation of an additional function, before operating the control and drain valves. With this arrangement, the system is fail-safe inasmuch as the hydraulic function will not operate in the event of hydraulic or electrical failure, if the hydraulic function and the operator input signal difference is above or below predetermined maximum and minimum values, or in the absence of the second input signal. | ||||||
| 162 | Flow-sensing switch for backup steering system | US55673375 | 1975-03-10 | US3913324A | 1975-10-21 | MILLER WAYNE RUSSEL; LUCKE JR ROBERT JAMES |
| Disclosed is a vehicle power steering system including a flowsensing switch for energizing an electrohydraulic safety backup system for supplying fluid pressure to the steering motor of the vehicle when a main pump becomes inoperative to supply pressure fluid to the steering motor. The flow-sensing switch is in the form of a poppet valve including a valve element which is normally seated to complete an electrical circuit for energizing an electric motor for driving an auxiliary pump. The poppet valve element is held open by fluid pressure delivered by the main pump when the main pump is working properly. The output of the auxiliary pump is connected to the poppet valve element such that the fluid pressure delivered by the auxiliary pump aids in maintaining the poppet valve element in its closed position.
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| 163 | Method and apparatus for instantaneously isolating a fluid operated load applying cylinder from its source | US39472073 | 1973-09-06 | US3902319A | 1975-09-02 | OLMSTED PETER B |
| The continuous comparison of a retained fluid pressure memory sensed or monitored from a pulsating flow of fluid under pressure to and from a load supporting hydraulic pressure compensating working cylinder through an isolating valve, with said pulsating fluid under pressure to irrevocably close the isolating valve and thereby isolate the working cylinder upon a calculated threshold loss of load or of fluid pressure to immediately render the pressure differences harmless.
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| 164 | Closed center valve | US3680577D | 1970-11-30 | US3680577A | 1972-08-01 | MCGEACHY DONALD E |
| A control valve for fluid operated circuits for controlling machines and the like which includes a valve member biased to a pressure-off position with a pilot passage and control chamber to effect a line-pressure on-position with a change-over from pilot control to a holding position from line pressure. If line pressure is interrupted for any reason, the valve member returns to a pressure-off position and must be reactivated by an operator, thus preventing an accidental machine start-up when line pressure is restored. The closed center condition as the valve moves to a work position permits change-over from pilot to main pressure control with no pressure loss.
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| 165 | Valve actuator | US3675420D | 1970-10-07 | US3675420A | 1972-07-11 | ADAMS LADD M |
| A valve actuator utilizing a power fluid and a biasing fluid for the opening and closing of a valve member of a valve assembly, wherein a portion of the power fluid is retained in an accumulator assembly which is adapted to utilize the biasing fluid to move the power fluid to a valve member actuator to either open or close the valve member upon actuation of the valve actuator in such a manner that the valve assembly failsafe in an opened or closed position.
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| 166 | Apparatus for comparing hydraeric pressure signals and detecting disparity therebetween | US51086665 | 1965-12-01 | US3406702A | 1968-10-22 | JENNEY GAVIN D |
| 167 | Hydraulic drive systems for mineral mining machines | US59116466 | 1966-11-01 | US3392525A | 1968-07-16 | ANDERSON FORREST S |
| 168 | Fluid flow control | US42704665 | 1965-01-21 | US3357444A | 1967-12-12 | ZEUNER KENNETH W |
| 169 | Vehicle having emergency equipment | US8148761 | 1961-01-09 | US3088284A | 1963-05-07 | AARON JAMES R |
| 170 | Safety device for a control loading mechanism | US81387959 | 1959-05-18 | US3067725A | 1962-12-11 | HEMSTREET HAROLD S; ALEXANDER MONTGOMERY |
| 171 | Marine propulsion installations | US5374360 | 1960-09-02 | US3034584A | 1962-05-15 | THOMAS HINDMARCH |
| 172 | Impulse actuated servo-control valve | US34624353 | 1953-04-01 | US2882931A | 1959-04-21 | HATHORN TOWLER FRANK; MAURICE TOWLER JOHN |
| 173 | Control lock mechanism | US46627154 | 1954-11-02 | US2738149A | 1956-03-13 | PEED JR GARLAND P |
| 174 | Pressure operated mechanism | US6648448 | 1948-12-21 | US2577462A | 1951-12-04 | STANLEY HACKNEY |
| 175 | Control apparatus | US66972446 | 1946-05-14 | US2545532A | 1951-03-20 | STEVENS ROY R |
| 176 | Safety device for hydraulic power transmission apparatus | US43792442 | 1942-04-07 | US2349284A | 1944-05-23 | KINZELMAN GERALD W |
| 177 | Fluid pressure remote control system | US24106338 | 1938-11-17 | US2207491A | 1940-07-09 | MACDONALD PARKER SYDNEY |
| 178 | Cylinder relief-valve | US581788D | US581788A | 1897-05-04 | ||
| 179 | Equalizer | US434795D | US434795A | 1890-08-19 | ||
| 180 | Elevatoe | US427065D | US427065A | 1890-05-06 | ||
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