| 摘要 |
A jack for a building support (15) comprises a jack screw (1) with an external screw thread, a jack handle (2) with an internal screw thread in engagement with the external screw thread and a bearing cap (3) which engages the jack handle (2) and includes a base (9) through which the jack screw (1) passes and which, in use, engages and supports the building support. The bearing cap (3) includes connecting means (14) by which it may be connected to the building support and the bearing cap has a radially outwardly directed annular groove (13) into which extend at least two radially inwardly extending projections (8) on the jack handle. |
