公开(公告)号：US4163412A

公开(公告)日：1979-08-07

申请号：US839053

申请日：1977-10-03

申请人： Ralph D. Porter

发明人： Ralph D. Porter

IPC分类号： F15B1/02 ,  F15B13/042

CPC分类号： F15B1/02 ,  Y10T137/2635

摘要： A control system for a fluid pressure-actuated cylinder or the like includes a pump supplying fluid from a reservoir to a control valve which may be selectively operated to cause cylinder extension or retraction and to immobilize the cylinder at a selected position. A unidirectional flow device connects an accumulator to the flow passage between the control valve and cylinder to smooth pressure fluctuations which can otherwise occur when the control valve is closed and which can otherwise produce erratic cylinder motions. Means are provided to relieve excessive pressure in the accumulator, at times when the control valve is shifted to release fluid from the cylinder, without in the process causing unwanted cylinder drift from feedback of the fluid from the accumulator to the cylinder. The excess accumulator pressure is vented to the reservoir through a pilot-operated check valve which is responsive to the pressure differential across the unidirectional flow device in order to allow communication between the accumulator and the reservoir but only when the pressure in the passage between the control valve and cylinder is less than that in the accumulator by a predetermined amount.

摘要翻译： 用于流体压力致动气缸等的控制系统包括将液体从储存器供应到控制阀的泵，该泵可以选择性地操作以引起气缸延伸或缩回并将气缸固定在选定位置。 单向流动装置将蓄能器连接到控制阀和气缸之间的流动通道，以平滑压力波动，否则当控制阀关闭时可能会发生，否则可能会产生不规则的气缸运动。 提供了用于缓解蓄能器中过大压力的装置，这时有时控制阀被移动以从气缸释放流体，而不会导致不必要的气缸从流体从蓄能器反馈到气缸的漂移。 多余的蓄压器压力通过先导式操作的止回阀排放到贮存器，该止回阀响应于单向流动装置上的压力差，以便允许蓄能器和储存器之间的连通，但是仅当控制器之间的通道中的压力 阀和气缸小于蓄能器中的预定量。

公开(公告)号：US4065112A

公开(公告)日：1977-12-27

申请号：US716847

申请日：1976-08-23

申请人： Edward V. Leskovec ,  Ralph D. Porter

发明人： Edward V. Leskovec ,  Ralph D. Porter

IPC分类号： B66F3/32 ,  B66F9/22 ,  F15B15/22 ,  B66F3/24

CPC分类号： F15B15/227 ,  B66F3/32 ,  B66F9/22

摘要： Cushioning apparatus for cushioning a hydraulic jack is disclosed which includes a plunger reciprocably mounted within a blind bore. The plunger sequentially closes off a plurality of axially spaced orifices provided through the wall of the bore as the plunger moves from a first position adjacent the open end of the bore to a second position adjacent its closed end, thereby progressively restricting the escape of fluid from the bore so as to slow the movement of one of the telescopic members of the jack toward another.

摘要翻译： 公开了用于缓冲​​液压千斤顶的缓冲装置，其包括可往复运动地安装在盲孔内的柱塞。 当柱塞从邻近孔的开口端的第一位置移动到邻近其封闭端的第二位置时，柱塞顺序地封闭通过孔的壁提供的多个轴向间隔开的孔，从而逐渐地限制流体从 该孔以便使千斤顶的伸缩构件之一的运动减慢。