| 摘要 |
<p>The prop comprises a device for the quick decoupling of the lower portion (1) which rests on the ground and the upper portion (2) which supports the load, consisting of a part (9) carrying stepped recesses in the form of castellated parts on its upper edge and another part (10) carrying stops (14) which can be supported on the bottom of said stepped grooves or on the upper steps thereof, in which the stepped recesses are produced on the upper edge of the screw nut, which adjusts the height of the prop, and the stops which can rest the bottom of the grooves or on the upper steps thereof are produced on a rotating part which receives the load of the upper portion of the prop and which similarly receives the action of an internal spring.</p> |
