| 摘要 |
<p>A rotatable and lockable bollard for use in winching and securing a rope or hawser comprises: an inner cylinder (12) the base (10) of which is securable to a deck or other structure, and an outer concentric cylinder (20) which is adapted to have the rope or hawser (44, 46) wound around its outer surface and to rotate freely on the inner cylinder (12) when pulled thereby, and respective gear rings (14) secured to the top or inside of the inner cylinder and the inside (24) of the outer cylinder, preferably to the upper part of each cylinder, and engageable together when the outer cylinder is axially displaced at the termination of heaving; and a plurality of flattened slightly curved guide blocks (30) are provided adjacent to the gear rings (14, 24) and fixed to one (preferably the outer) of the rings and serving to house a roller bearing (32, 34) which runs freely around the outer gear fring as it rotates, the bearing being able to be displaced within a sloping slot (50) in its block (30) to allow the axial displacement of the cylinders (12, 20). Preferably the outer cylinder (20) has an outwardly extending lip (22, 40) at its upper and lower extremity, so as to retain the rope or hawser wound, there around; and the respective cylinders (12, 20) fit closely within each other with a clearance sufficient for the packing of lubricating grease therebetween. Engagement of the gear teeth (16, 26) locks the bollard.</p> |
