发明名称 |
Control arrangement for a hydraulically operated device |
摘要 |
A control arrangement for a hydraulically operated load lifting and lowering device includes precontrolled first valve means controlling flow of fluid from a source under pressure to a return conduit leading to a tank or to a working conduit leading to the device and a closer block in the working conduit, including a piston controlling flow of pressure fluid from the working conduit into the device, respectively flow of pressure fluid out of the device into the return conduit downstream of the piston. A throttle is arranged in the return conduit to produce upstream of the throttle a pressure acting on the piston but not on the slide of the first valve means, whereby without increasing the neutral fluid circulation pressure a uniform lowering of the load independent of the magnitude thereof may be obtained.
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申请公布号 |
US4292884(A) |
申请公布日期 |
1981.10.06 |
申请号 |
US19790009045 |
申请日期 |
1979.02.02 |
申请人 |
ROBERT BOSCH GMBH |
发明人 |
SCHUMACHER, WERNER;SCHWERIN, GUENTHER |
分类号 |
F15B11/04;A01B63/10;F15B11/08;(IPC1-7):F15B11/08;F15B13/04 |
主分类号 |
F15B11/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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