| 摘要 |
A rope drum is rotatably mounted on an axle, which is fixed in a frame. A rope is wound on said drum and adapted to be pulled from said drum so as to rotate the latter in a predetermined sense. A pullback spring tends to rotate said drum opposite to said predetermined sense. A one-way coupling element is pivoted to said drum on a pivotal axis that is parallel to the axis of said axle. The coupling element carries a first stop and is pivotally movable about said pivotal axis from an inner position to an outer position for one-way coupling engagement with a clutch member on an input shaft of an internal combustion engine, and back to said inner position. A locking member carries a second stop and is movable relative to said axle and mounted in said coupling element for rotation relative thereto about an axis of rotation to a locking position, in which said second stop cooperates with said axle to prevent an outward movement of said coupling element from said inner position to said outer position, and to a non-locking position of said locking member, in which said second stop is arranged to permit said outward movement and said locking member engages said coupling element in the sense of said outward movement. A constraining spring extends around and is rotatable about said axis and torsionally prestressed to be normally in frictional contact with said axle and has at one end a spring arm, which protrudes laterally from said axle and engages said locking member. Said constraining spring tends to move said locking member by means of said spring arm in the sense of said outward movement. |
