| 摘要 |
<p>A swivel (10) for mounting an oar (21) on a rowing boat is pivotally mounted by a spindle (12) on a rigger (11). An element (23) on the swivel has a thrust face (24) for transmitting the force generated by the stroke of the blade in the water from the oar to the boat via the rigger. The pitch angle of the element, and hence the thrust face, is adjustable by rotation of a cam (28) and thus the effective operating angle of the blade in the water can be adjusted.</p> |
