| 摘要 |
A height adjustable bearing for the plates of flat roofs or the like consists of a base plate, a central cross member, and in each of four quadrants of the base plate a respective bearing pedestal, a pair of wedge-shaped blocks between the bearing pedestals and a bearing brass, and a support for a plate. Each pair of blocks is connected together by a bolt in screw threaded engagement with the blocks such that rotations of an actuating element turns the bolt and draws the blocks together thereby raising or lowering the support to adjust the height of the supported plate. |
