| 摘要 |
A first push of an engaging piece moves a projecting portion provided on a case along a one-way passage loop provided on one face of a cam plate while simultaneously moving the cam plate transversely, guiding the projecting portion into an engaging portion provided in said passage, locking the device. Pushing the engaging piece a second time disengages the projecting portion from the engaging portion and moves the cam plate transversely back to its original position, unlocking the device.
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