| 摘要 |
A mechanically operated, cable driven jack includes a base, a hollow upright support member secured to the base, a first hollow support tube telescopically received in the support member, and a second hollow support tube telescopically received within the first support tube. The first and second support tubes are interconnected by means of a cable and a series of sheaves and driven by a winch employing a worm gear drive principle so as to move the first and second support tubes from collapsed condition to an extended position. Safety means are also provided to limit the downward movement of the tubes and the arrangement of the pulley sheaves and the cable drive is such that upward movement is also controlled. Modifications of the jack include the provision of selected alternate attachment points for the free end of the cable so as to enable the jack to be modified for fast or slow movement, depending upon the precise engagement point of the free end of the cable. A further feature of the invention is the provision of an improved saddle capable of use with any of the forms of the invention and also capable of adjustment to accommodate varying sizes of transmissions and of tilting in several planes so as to facilitate removal of the transmission from particularly restricted environments, depending upon the make and model of the vehicle involved.
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