公开(公告)号：US3817150A

公开(公告)日：1974-06-18

申请号：US31916572

申请日：1972-12-29

申请人： SLI IND

发明人： COX R

IPC分类号： F15B9/12 ,  F01B1/00

CPC分类号： F15B9/12 ,  Y10T137/86598

摘要： A hydraulic actuator having a selectively positioned, rotary output shaft. The actuator includes a control assembly in which a spool valve controls the admission and return of working fluid through a valve port. The spool valve position is controlled by a pilot assembly which communicates with valve chambers exerting pressure on opposite ends of the spool valve. The pilot assembly includes opposed nozzles connected with the valve chambers and a flapper between the nozzles which may be moved back and forth between them to variably restrict their output and hence the pressure in the valve chambers. The flow of fluid from the control assembly is directed to an output assembly which has first and second movable pistons mounted in piston chambers. The first piston chamber is continuously connected to a source of working fluid at supply pressure, while admission of fluid to the second piston chamber is controlled by the spool valve via the valve port. The pistons are connected by a link secured to an output shaft and exert opposing torques on the link. When fluid is directed into the second piston chamber, the second piston exerts the greater torque rotating the shaft in one direction. When fluid is vented from the second piston chamber, the first piston rotates the output shaft in the opposite direction. A finger feeds back a portion of the motion of the link to the flapper via a spring to center the flapper when the output shaft is in a selected position.

摘要翻译： 具有选择性定位的旋转输出轴的液压致动器。 致动器包括控制组件，其中滑阀控制工作流体通过阀口的进入和返回。 滑阀位置由一个先导组件控制，该导向组件与在阀芯的相对端施加压力的阀室连通。 导向组件包括与阀室连接的相对的喷嘴和喷嘴之间的挡板，其可以在它们之间来回移动，以可变地限制其输出，并因此限制阀室中的压力。 来自控制组件的流体流动被引导到具有安装在活塞室中的第一和第二活动活塞的输出组件。 第一活塞室在供应压力下连续地连接到工作流体源，同时通过阀口由滑阀控制流体到第二活塞室的入口。 活塞通过固定到输出轴的连杆连接，并在连杆上施加相反的扭矩。 当流体被引导到第二活塞室中时，第二活塞施加更大的扭矩以使轴沿一个方向旋转。 当流体从第二活塞室排出时，第一活塞使输出轴沿相反方向旋转。 当输出轴处于选定位置时，手指经由弹簧将连杆的运动的一部分反馈到挡板，以使挡板居中。

公开(公告)号：US3646536A

公开(公告)日：1972-02-29

申请号：US3646536D

申请日：1969-12-04

申请人： SLI IND

发明人： BLEIMAN LEWIS W

IPC分类号： G11B5/54 ,  G11B21/12 ,  G11B5/60

CPC分类号： G11B5/54

摘要： Apparatus for shifting a plurality of vertically spaced pairs of magnetic heads into a vertical stack of magnetic memory discs and pressing the heads of each pair in opposite directions against the discs above and below the heads, the heads being supported in side-by-side relation on resilient strips with an actuator between the strips for shifting the heads into engagement with the discs. The actuator comprises an elongated spring arm with two laterally projecting wings that are oppositely inclined from the horizontal when the spring is free, each wing having a follower on its tip engageable with a cam along the path of the tip to shift the wings away from the associated discs and stress the arms during retraction of the heads and to release the wings to the action of the springs during insertion.

公开(公告)号：US3698437A

公开(公告)日：1972-10-17

申请号：US3698437D

申请日：1971-07-15

申请人： SLI IND

发明人： COX ROBERT M

IPC分类号： F15B13/043 ,  F16K11/07 ,  F16K31/04

CPC分类号： F16K11/07 ,  F15B13/0438 ,  Y10T137/86598 ,  Y10T137/86614

摘要： A valve assembly comprising a spool valve for controlling flows of actuating fluid to and from a hydraulic cylinder by movement of the spool in opposite directions from a neutral position in response to unbalanced pressures in chambers at the ends of the spool, and a pilot valve assembly mounted on the end of the spool valve housing and including an electromagnetically actuated flapper for variably restricting flows from the end chambers. Two balanced springs engage opposite sides of the flapper to urge it toward a centered position, and a longitudinally slidable feedback pin between one spring and the end of the spool adjusts the force of the spring in accordance with changes in the position of the spool.

摘要翻译： 一种阀组件，其包括滑阀，用于响应于在所述阀芯的端部处的腔室中的不平衡压力，通过所述阀芯沿相反方向从中性位置的运动来控制致动流体流动到液压缸的流动;以及先导阀组件 安装在滑阀壳体的端部并且包括用于可变地限制来自端部腔室的流动的电磁致动挡板。 两个平衡弹簧接合挡板的相对侧将其推向中心位置，并且在一个弹簧和阀芯的端部之间的纵向可滑动的反馈销根据阀芯位置的变化来调节弹簧的力。

公开(公告)号：US3665500A

公开(公告)日：1972-05-23

申请号：US3665500D

申请日：1970-04-01

申请人： SLI IND

发明人： LEWIS MARTYN A ,  DOMIN SIEGFRIED

IPC分类号： G05D3/14 ,  G05B11/18

CPC分类号： G05D3/1445 ,  G11B5/022 ,  G11B5/5547

摘要： Apparatus selectively and automatically operable in either a linear or a pulse-width modulation mode. A controlled feedback loop in a basically linear system is automatically closed in response to threshold conditions of particular parameters of a moving inductance type load, the loop providing positive feedback in a range of frequencies determined by the phase shift characteristics of the load and additional phase shift circuits. The positive feedback results in a controlled oscillatory condition producing a pulse-width modulation mode for the system.

摘要翻译： 设备以线性或脉冲宽度调制方式选择性地和自动地操作。 响应于运动电感型负载的特定参数的阈值条件，基本线性系统中的受控反馈回路自动关闭，该回路在由负载的相移特性和附加相移确定的频率范围内提供正反馈 电路。 正反馈导致产生用于该系统的脉冲宽度调制模式的受控振荡条件。