| 摘要 |
a) Safety device for doors with a shutter which rolls up vertically consisting of a rotary drum (2), in particular actuated by a motor (3), around which the shutter (1) can be wound so as to move the door between an open position and a closed position and safety members mounted inside the drum (2) which facilitate re-opening of the door once it has been closed, even if the motor has broken down. b) Device characterised in that the safety members consist of a helical spring (13) engaging with mechanically-controlled compression members (6, 9) so that a quantity of energy is automatically stored when the door is closed and can be reused to open the door from this position, in particular when the motor is disengaged (3). <IMAGE>
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