| 摘要 |
This invention relates to a device in machines provided with a supporting part in the form of a preferably hydraulically operated lifting crane, the device being intended to connect a load-carrying and/or a load-gripping part of the machine with the supporting part, and the load-carrying and/or the load-gripping part can be rotated and/or tilted in relation to the supporting part. According to the invention the device comprises a wheel (4) which is rotatably arranged in the device and has a circular part (9) extending round the wheel at its peripheral portion, the wheel (4) being intended to be connected with the load-carrying and/or load-gripping part. The circular part (9) has a first, essentially plane portion (10) which is intended to slide against a first, essentially plane portion (19), arranged in a stationary, plate-like means (18A) in the device. The device is so made that the wheel (4) can be locked in relation to the plate (18A) by means of at least two brake blocks (27, 28), which are intended to force the wheel (4) and the plate (18A) to frictional engagement with each other. |
