| 摘要 |
Chain stopper for preventing a chain from moving downward. The chain stopper comprises at least four blocks (8) that are hinged at their first ends, and at their second ends have a surface that is adapted to engage a chain link. The blocks (8) are mounted in opposite pairs, preferably at a spacing of about 90°, so that the pair of opposite blocks (8) that are immediately below a chain link that lies in substantially the same plane as the blocks (8) will be engaged by the blocks. |
