| 摘要 |
A lever ( 30 ) can be assembled in either of two postures symmetrical with respect to an axis of symmetry ( 19 ), and the rotating direction of the lever ( 30 ) changes depending on the assembling posture. Thus, the rotating direction of the lever ( 30 ) can be selected depending on circumstances. A cam follower ( 52 ) can enter a cam groove ( 33 ) regardless of the posture in which the lever ( 30 ) is assembled. The lever ( 30 ) can be held at a standby position by a holder ( 21 L, 21 R, 22, 34, 36 ), and the lever ( 30 ) can be locked at a connection position by a lock ( 21 L, 21 R, 23 L, 23 R, 39, 41 ).
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