| 摘要 |
A bearing block (1) has a head (2), a central hub (4), bearing means (6) facilitating rotation of the sheave about the central hub (4). The block further has locking means for removably locking a length of high strength, fibrous material, such as cord (15), to the block for tethering the block to a boat deck or the like. The locking means (15) may be a part of the block head, cheeks, or may be located at the block central hub (4). Preferred locking means are a plurality of passages (10,12,14) for the cord ends to pass through, with set screws in two of the passages for removably holding the cord ends therein. A center portion of the cord length thus forms a loop for tethering the block. <IMAGE> |
