| 摘要 |
An angularly adjustable coupling (8, 40, 80, 200, 300, 400) pivotally mounte d to each other about a pivot axis. One coupling member (10) includes a lockin g rib (17) of circular configuration coaxial with the pivot axis and the other coupling member (20) includes a pair of pivotal arms (26, 27) having locking surfaces normally engageable with the locking rib (17) to lock the two coupling members against pivotal movement, but manually moveable to release the locking rib and to permit one coupling member to be pivoted with respect to the other to any desired angular position. |
