| 摘要 |
The reflectors shaped like a band are fixed onto a support (4) which is brought by a slow movement inside the post (1), in such a way that a portion of the reflector stands freely behind each of the openings (2, 3) and the cleaning devices (10, 13) - porous cushions with a tank for the cleaning liquid and synthetic material brushes integral with the post (1) - clean the outer part of the reflector. The support (4) may be actuated by at least one windmill (15) arranged in the post (1), on top of a gearing down mechanism (17) or by a spring wound up by the windmill (15); the support may thus effect a motion from top to bottom or a rotary motion, first rectilinear for example by means of a reversible device (7) of which the rotor (6) is firmly secured to the support (4) having the shape of a sleeve. The arrangement and/or the configuration of the openings provided for the wind inlet (22, 23) in the post wall and/or the blade of the windmill provide the driving in a selected rotation direction. The post (1) is comprised of two longitudinal semi-envelopes. The reflectors may, as a warning of slippery road, be made of a material which reflects in different colours depending on the temperature. |
