Abstract: A force multiplier mechanism comprising a base supporting member, a driving lever being pivotably connected by a first pivot means to said base supporting member which can be rotated about the first pivot for a predetermined angle between a first and second position thereof, a driven lever one end of which is pivotably connected to the free end of the driving lever by a second pivot, a follower pivotably connected to the other end of the driven lever which receives a multiplied force and transmits it to other member, said follower being supported remote from the second pivot means by a distance substantially equal to the distance defined between the first and second pivot means, and a guide means for guiding the follower coupled to the driven lever which forces the driven lever to rotate about the second pivot and in turn forces said follower along a continuous pathway to a point located close to said first pivot resulting in high force multiplication.

Abstract: A jack for raising car bodies in which a threaded-driven movable block screwed on a threaded rod is threadedly moved to cooperate with first and second link means to raise a lifting table adapted to be engaged with car bodies, the first and second link means establishes a proportional relation between the speed of upward travel of the lifting table and the speed of transverse movement of the movable block.