| 主权项 |
1. A device for assisting the opening of a covering element (3) pivotally mounted relative to an edge (2a) of a frame (2) between a lowered position for closing the frame (2) and a raised position for opening the frame, comprising at least a spring actuator (6) including two ends, the two ends of which are connected and jointed respectively with the covering element (3) and with the edge (2a) of the frame (2), characterized in that the actuator (6) comprises a hollow shaft (7), an end wall (8) of which includes an external yoke (9) connected and jointed with the covering element (3) or with the edge (2a) of the frame (2), a guide pin (10) accommodated in the hollow shaft (7) and connected at its end opposite to the end wall (8) of the hollow shaft (7) to the edge (2a) of the frame (2) or to the covering element (3) through a jointing yoke (11), a spring (13) accommodated in the hollow shaft (7) while surrounding the guide pin (10), said spring (13) being pre-stressed in an unloaded state all along the guide pin (10) between the end wall (8) of the hollow shaft (7) and the yoke (11) of the guide pin (10), a length portion (10a) of which protrudes from the hollow shaft (7), when the covering element (3) occupies its raised opening position, and said spring (13) being compressed in the hollow shaft (7) between the end wall (8) of the hollow shaft (7) and the yoke (11) of the guide pin (10) when the covering element (3) occupies its lowered closing position, and a means (14) secured to one of the ends of the guide pin (10) for retaining the spring (13) pre-stressed in the unloaded state, and in that, during the assisted opening of the covering element (3) by the spring actuator (6), the spring (13) is released in order to cause guided sliding of the hollow shaft (7) by the guide pin (10). |
