| 摘要 |
<p>A tubular piece (1) is connected at one end to a universal joint (2), which engages the roller shutter casing crank, and at the other end to a clevis (3). The clevis has a metal connection piece articulated at one end. The other end of the connection piece is connected to the hoist drive rod (5) via a ball joint in a plate (10).</p> |
