| 摘要 |
667,821. Davits. VREUGDENHILL. A. Feb. 9, 1950 [March 10, 1949], No. 3387/50. Class 115.. On a luffing gravity davit the hook 11 to support the upper fall block 12 is pivotally attached to the davit head. Its inclination to the davit can be controlled by the screw 17 so that the block can be slipped if desired even with the davit having an inboard list. In a modification the inclination can be controlled by an eccentric cam. |
