Patent ID: 6092788
Filing Date: 2000-07-25
Classification: B66F

Abstract:
A pneumatic jack comprising, in combination:a frame including a rigid planar top plate and a rigid planar bottom plate each having a periphery with a equilateral triangular configuration, each side edge of the peripheries of the plates having an elevation assembly mounted adjacent to each end thereof with each elevation assembly including a plurality of cross members being pivotally coupled at centers thereof to define a plurality of cross member pairs, ends of the cross members of each cross member pair being pivotally coupled to ends of the cross members of an adjacent cross member pair, wherein a bottommost and a topmost one of the cross member pairs of each elevation assembly is pivotally mounted to the end of the corresponding edge of the bottom plate and the top plate, respectively, wherein the central extent of the cross members of one of the cross member pairs includes two pair of opposed semicircular recesses for maintaining a height of the associated elevation assembly upon the insertion of a pin therebetween; andan inflatable chamber situated between the top plate and the bottom plate of the frame with three side faces each having a top edge and a bottom edge coupled to one of the edges of the top plate and the bottom plate of the frame, respectively, one of the side faces having a valve mounted on a central extent thereof for receiving air to elevate the top plate of the frame with respect to the bottom plate.