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/Annots [153 0 R] on screw act when jack is at its lowest position. A good example is the car-jacks. xref
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Let us assume that, the thread on screw is a Double Start Square thread. 147 29
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When screw is rotated with the help of the handle, it moves axially.
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/Length 592 Let L 1, L 2 3, L 4 be the length of each link. In the case of a screw jack, a small force applied in the horizontal plane is used to raise or lower large load [3]. 148 0 obj
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