| 摘要 |
An adaptor (16) is formed with a pair of cylinders (22 and 24) which are in axial alignment, of different diameters and extend from opposite sides thereof. One of the cylinders (22) and (24) fits in complementary fashion into one of a pair holes (14) and (12), respectively, to preclude any movement in a radially lateral direction of adaptor (16) relative to the axis of the hole. The other one of cylinders (22) and (24) fits, respectively, into a groove (44) formed in a face (42) of a guard collar (18) or into a cylindrical opening (36) of the collar. The cylinders (22) and (24) are joined by integral links (26, 28 and 30) so that the precluding of radially lateral movement of the cylinder (22) or (24) within its hole (14, or 12), respectively, prevents radial movement of collar (18) relative to the axis of the hole. <IMAGE> |
