| 摘要 |
PCT No. PCT/SE94/01100 Sec. 371 Date Jul. 2, 1996 Sec. 102(e) Date Jul. 2, 1996 PCT Filed Nov. 18, 1994 PCT Pub. No. WO95/19813 PCT Pub. Date Jul. 27, 1995A driven barrel of a winch device includes a closed cylindrical space (16) which is concentric with the barrel and accommodates a piston (17) which can move on an axis (12) from one end of the cylindrical space to the other and is in non-rotatable connection (19, 20) with the inside of the barrel. The axis (12) has screw threads (15) and the piston (17) has a center bore with screw threads meshing with the screw threads of the axis. The cylindrical space encloses a fluid and the piston (17) is given a leak from one side of the piston to the other. In order to stop the loaded rope unwinding from the barrel if the rotation speed of the barrel should increase over a certain value the leak is in the form of a canal (21) which accommodates a valve means including a valve housing and a valve body (22). The valve means stops the fluid flow over the valve body in one direction at a certain pressure drop over the valve body. |
