| 摘要 |
A device for use with piping or other equipment that is subject to changes in position due to variations in its thermal condition. The device comprises actuating means, which is secured to the piping at spaced first and second locations and is movable relative to the piping in response and in direct proportion to expansion or contraction resulting from said variations in thermal condition, and coupling means. The actuating means includes a rigid member connected at one end to the piping at the first location and a ball screw and nut unit connected to the piping at the second location and connected to the other end of the rigid member. The coupling means is variable in effective length and is connected at one end to the ball screw and nut unit and at its other end to a stationary support. The coupling means includes gearing which is cooperatively associated with the ball screw and nut unit. The parts are so constructed and arranged that increments of movement of the actuating means cause corresponding variations in the effective length of the coupling means.
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