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Hebei Liston Lifting Rigging Manufacturing Co., Ltd.
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Mechanical Jacks



In contrast to hydraulic jacks, mechanical jacks use only physical means of raising and lowering their loads. Using mechanical advantage, these jacks are commonly seen in the automotive industry for lifting vehicles and other loads. A common type of Mechanical Jack is known as a “screw jack.” With the use of a motor, or a lever that is cranked by an operator, a screw uses the shape of its threads to raise or lower the jack. Depending on the type of jack, the screw itself may raise or lower the load, or a traveling nut does the raising while the screw turns in place. These jacks have many applications that include moving platforms on stages, changing settings on woodworking machinery, and adjustments of radio telescopes. Other applications also involve the use of mechanical jacks and they provide some advantage over hydraulic systems. Mechanical systems are normally self-locking. This means that when power is removed from the jack, the screw remains in the same position until power is reapplied. Self-locking properties make these jacks safer to use than hydraulic units, since operators need not worry about loss of power. Drawbacks of a mechanical system include the fact that they are not capable of lifting the same loads as hydraulic lifts. Additionally, levers that provide mechanical advantage for manual operations can only reach a certain length before bending and becoming useless.

mechanical jack

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