Patent ID: 7237762

Claim:
A lifting mechanism and spacer block arrangement comprising: a lifting mechanism installed in a lifting jack and driven to move a lifting rod vertically, the lifting mechanism including a portion of a magnetically attractive material at a bottom side; a plurality of spacer blocks removably attachable from the lifting mechanism and each of the other spacer blocks, and configured for attaching to the bottom side of the lifting mechanism to space the lifting mechanism from a supporting surface at multiple angular orientations, the spacer blocks of a magnetically attractive material; the spacer blocks each including: a top side including a border configured for receiving the bottom side of the lifting mechanism within the border, such that movement of the lifting mechanism is substantially constrained; at least one magnetic element fixedly mounted in the top side of each of the spacer blocks in a flush manner, the at least one magnetic element of a material magnetically attractive to the magnetically attractive material of the lifting mechanism and the spacer blocks; and, a bottom side including a periphery correspondingly configured with the border of the top side of each of the spacer blocks for receipt in the top side of a spacer block within the border, such that movement of the spacer block with the bottom side is substantially constrained with respect to the spacer block with the top side, and the spacer blocks are arrangable in a stack and secured to the bottom side of the lifting mechanism.