| 摘要 |
<p>The present disclosure relates to a device (1, 11 ) for launching a projectile (85). The device (1, 11 ) comprises a support body (2), a flexible element (31 ) for pushing the projectile (85) and movable relative to the support body (2) between a rest position and a loaded position, a pulley (51, 52) pivotally mounted on the support body (2) and configured to wind a portion (31 a, 31 b) of the flexible element (31 ) during a rotation of the pulley (51, 52) in a winding direction, an elastic motor (6) for rotating the pulley (51, 52). The elastic motor (6) comprises a first member (61 ), a second member (63), and an elastic member (65) connecting the first member (61 ) to the second member (63). The elastic member comprises a spiral or helical spring (65) having more than one turn, each turn being radially overlapped with at least a part of a previous turn. The second member (63) is angularly displaceable relative to the first member (61). An elastic energy of the elastic member (65) is dependent on an angular displacement of the second member (63) relative to the first member (61). The second member (63) is connected with the pulley (51, 52), such that an angular displacement of the second member (63) is related to a rotation of the pulley (51, 52).</p> |
