| 摘要 |
<p>The roller has a releasing button and a slider piece, which are movable between resting and release positions. The button and the piece block the movement of a chain wheel in the resting position, and work together with a toothed rim connected fixedly with the wheel in the release position. The rim is designed as inner toothed rim of the wheel, and a latch is pivotably arranged on the side surrounded by the rim. The latch is engaged and detached to/from the rim in the resting and the release positions of the button and the piece.</p> |
