| 摘要 |
In the fitting groove (2) the drive bar (12) has a width (B) equal to the maximum width (b) of the groove (2). On assembly the drive bar moves under gravity into engagement transverse to the groove wall. In its initial position the drive bar (12) lies within the clear width (b) of the groove and so free of the groove walls (5,6), with the nose (14) and mounting space (11) engaged. The drive bar (12) rides along supports (9,10) into its engaged position at right angles to the groove walls (5,6) in response to the turn of the groove. The section of the mounting space (11) opening exceeds that of the nose (14) at the end facing the space.
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