| 摘要 |
It consists of a rotary horizontal spindle 1 housed inside the upper horizontal portion 2 which, with the vertical columns 3, constitute the gantry, carrying the main nut 8 and the safety nut 9, separated by the space 31, the radial plates 10 descending inside the guide 11 and the main nut 8 carrying the lugs 12 for fixing the tractor chains 13 and 14 which are mounted over the pulleys 15, 18 and 19, in order to support the lifting carriages 16 and 20, by means of the clamps (flanges) 17, which run guided by the rollers 21, carrying, under the chains 13 and 14, the rod 22 for actuating the safety microswitch 23, comprising other end-of-travel microswitches 24 and 25 for limiting the fall and rise of the elevator carriages 16 and 20, and also the safety- bridge rod 28, with the portion 30, for the disconnection of the microswitch 25 for rising, the microswitches 24 and 25 being actuated by the square rod 34 provided with the recovery spring 37, and the mechanical locking catches 46 in the holes 39 via the safety cables 40 and 41. <IMAGE>
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