| 摘要 |
This invention relates to an improved pivotal coupling in which the rotational connection between the two coupling parts is defined by a cylindrical portion on one coupling part having a plurality of axially spaced circumferential grooves formed on the outer wall thereof and engaged by a plurality of complementary ridges formed on the inner wall of a bore formed in the other coupling part to contain the two parts against relative axial movement without restricting rotational movement therebetween.
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