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APPARATUS FOR CONTROLLING THE MOVEMENT AND POSITIONING OF STAGE SCENERY
APPARATUS FOR CONTROLLING THE MOVEMENT AND POSITIONING OF STAGE SCENERY
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机译：用于控制舞台布景的运动和定位的装置
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1312976 Moving theatrical scenery HYDRAFLOAT STAGE SYSTEMS Inc 29 May 1970 26099/70 Heading A6M [Also in Division Fl] A device for moving theatrical scenery comprises a hydraulic or pneumatic cylinder 21 containing a piston with an endless cable 23 fixed to either end of the piston and also, by means of an anchoring device 24 which passes through a slit in the stage, to the piece of scenery to be moved. To drive the cable a fluid, preferably air, under pressure is supplied to one end of the cylinder via line 30 and released via line 31, or vice versa, under control of the valve 36 which is operated by solenoids 38, 39 and the valves 32, 33 which are themselves pneumatically operated by valve 44. In the neutral position (illustrated) the fluid supply 40 is connected to both lines but the valves 32, 33 are closed. Activation of solenoid 38 connects line 30 to the fluid supply and line 31 to the atmosphere and simultaneous activation of solenoid 45 opens valve 44 so that valves 32, 33 are opened and the piston is driven to the right. Activation of solenoids 39 and 45 has the reverse effect. To provide for even motion of the scenery, control valves 34 limit the rate at which fluid can leave either end of the cylinder to a preset value, while by-pass valves 35 allow an unrestricted flow into the cylinder at the high pressure end. Fig. 3 (not shown) illustrates a control circuit for the various solenoids also including a "limit switch" having a number of contacts which are successively activated by the movement of the scenery along its track so that selection of a particular contact causes the movement of the scenery to be halted when a pre-selected position is reached. A belt and pulley system driven by the cable 23 conveys the effect of the movement of the scenery to the limit switch.
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机译：1312976移动舞台布景HYDRAFLOAT STAGE SYSTEMS Inc. 1970年5月29日，标题为A6M [也位于Fl分部]一种用于移动舞台布景的设备包括液压缸或气压缸21，该液压缸或气动缸21包含一个活塞，环形电缆23固定在活塞的任一端。并且，借助于锚固装置24，该锚固装置穿过舞台中的狭缝，到达要移动的风景。为了驱动电缆，在由螺线管38、39和阀操作的阀36的控制下，将压力下的流体，优选为空气，经由管线30供应至气缸的一端，并经由管线31释放，反之亦然。阀32、33本身由阀44气动地操作。在中立位置（图示）中，流体供应装置40连接到两条管线，但是阀32、33关闭。螺线管38的致动将管线30连接至流体供应，而管线31将其连接至大气，并且螺线管45的同时致动打开了阀44，从而阀32、33被打开并且活塞被向右驱动。螺线管39和45的激活具有相反的作用。为了提供风景的均匀运动，控制阀34将流体可以离开汽缸的任一端的速率限制为预设值，而旁通阀35允许在高压端无限制地流入汽缸。图3（未示出）示出了用于各种螺线管的控制电路，该控制电路还包括“限位开关”，该“限位开关”具有多个接点，这些接点被风景沿其轨迹的移动顺序地激活，从而选择特定的接点会引起移动。到达预选位置时要暂停的风景。由电缆23驱动的皮带轮系统将风景运动的影响传递到限位开关。
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