| 摘要 |
<p>The device has a flexible hollow socket (1a) cooperating with an axle (3) or an independent shaft (6) received by the axle. The socket has arrangements for rotatingly driving the axle or the shaft and for linearly displacing the socket along the axle or the shaft to adjust height of a tongue attachment using a manually maneuverable height adjusting unit (4) after mounting the attachment on the axle or the shaft, where the arrangements are constituted of a pin co-operating with a groove. The height adjusting unit is constituted of a nut placed under the socket.</p> |
