| 摘要 |
<p>Speed limiting device, characterised in that a ring (1) secured to the supports of the roller shutter and fixed with respect to its shaft (2) has a plurality of recesses (6) distributed around the internal periphery of the said ring (1), intended to receive the blocking elements (4), a shaft (2) secured to the winding tube, possibly connected to the latter by means of a speed-multiplying system which is concentric with the ring has, on its contour, diametrically opposite concave surfaces (7, 8), a mounting plate (3) which is coaxial with and outside the rotation shaft, free to rotate with respect to the latter has a plurality of radial grooves (9) which are possibly of cylindrical shape and of sufficient dimensions for the blocking rollers (4) to be in contact both with the edge of the said grooves (9) and the bottom of the said concave surfaces (7, 8). The said rollers (4) are kept in position by springs (5) which pass radially right through the shaft (2) and the mounting plate (3). <IMAGE></p> |
