| 摘要 |
IMPROVED DEVICE WITH A TAKE-UP ROLLER FOR CURTAINS OF THE ROLL-UP TYPE The device comprises a roller on which the curtain is rolled up, and which has its ends closed by a washer and a cap, provided with two opposed recesses one inside and the other outside the roller. A first support means is inserted in the outer recess and supports the end of a threaded rod passing inside the roller to be inserted, with its other end, in a second support means fastened to the washer, while the threaded rod crosses two opposed bodies one of which is fixed and the other is movable, by virtue of its coupling with the threaded rod and its axial rotation. Between the two bodies a helical spring is interposed, having its ends fastened to the same bodies, so that, the rotation of the roller causes the rotation of the movable body, which twists the spring, but at the same time moves along the threaded rod, so increasing the longitudinal space available to the spring.
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