| 摘要 |
<p>An improved forestry winch according to the invention comprises a lower pulley (1), which is vertically displaceable by means of a flexible towing member (3), which is by means of its first end portion (3') attached to a supporting beam (11) of said lower pulley (1) and by means of its second end portion (3'') to a fixed fastening point (5), wherein in the area between the supporting beam (11) and the fastening point (5) a resting member (7) arranged, which is mounted on a movable part (81) of a working cylinder (8), and wherein said cylinder (8) consists of at least said movable part (81) and a fixed part (82), which is firmly attached to a winch casing. Consequently, said lower pulley (1) is vertically displaceable with an uniform velocity and with a constant force..</p> |
