| 摘要 |
The link arms (9,10) are each articulately connected with both the rear and the front parts, forming with them a frame-shaped lifting mechanism manoeuvrable with the aid of a force development unit (12) for raising and lowering the tool. A tool support part (13) is rotatably arranged in relation to the front part around a horizontally directed rotary axis (14) in such a manner that the tool is at least limitedly tiltable in its longitudinal extent. The force development unit acts on the lifting mechanism via a lock arm (16) which is rotatable around a joint (17) between a lock position where a lock device (21) in the lock arm is in engagement with a lock device (19) in the tool support part, preventing it turning and thereby the tilting of the tool, and a release position where the lock arm and the tool support part lock devices are not in engagement. |
