| 摘要 |
<p>The disclosure relates to a grab ring comprising an annular element (10) having one set of teeth (13) projecting outwardly at an inclined angle to the annular element to one side thereof and a second set of teeth (14) projecting inwardly at an inclined angle to the annular element to the other side thereof to engage between a pair of inner and outer concentric cylindrical surfaces (20,24) to permit relative movement between the surfaces in one direction whilst preventing relative movement in the opposite direction. <IMAGE></p> |
