Jack

Details Jack Jack

1993-02-09

1994-02-15

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Screw

Geared

B60S 902

Patent

active

052860035

ABSTRACT:
A jack is provided which includes a vertical lift rod which is disposed within a tubular housing and has a male thread formed on its longitudinal body. Two guide blocks are included with each having a recess with a half female thread formed therein, the two blocks together forming a complete female thread to engage or disengage from the male thread of the lift rod. The lift rod can be lifted up by its rotation within the female thread, when the lift rod is rotated by a handle connected with a worm engaging a worm gear. The worm gear has two keys formed on its inner wall for receipt within two respective longitudinal slots of the lift rod for engagement thereof. The lift rod can be rapidly lowered by displacement of the two guide blocks away from engagement with the lift rod. A rack and pinion arrangement is provided for displacement of the guide blocks responsive to rotation of a handle coupled to the pinion.

REFERENCES:
patent: 1002982 (1911-09-01), Foster
patent: 3790133 (1974-02-01), Jones
patent: 4809962 (1989-03-01), Lee

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