| 摘要 |
<p>A horizontally sliding screen for door or French window apertures comprising a first module (1) containing a spring assisted roll-back mechanism (3, 4) fastened to a post of the aperture, a second abutment module (16) for a stiffening en d bar (8) of the screen (7), fastened to the opposite post, upper (11) and lower (10) channel guides for the said end bar (8) and optionally for the edges of the extended screen (7), respectively fastened to the threshold and the upper crossbar of the aperture, further comprises a rope (21 ) whose ends are respectively fastened to said end bar (8) running inside and run inside the said channel guides (1 0, 11), and on pulleys (18, 19, 20) fitted inside said second abutment module (16); a sagging (A) of the said rope (21) loaded with a weight (P) suspended by mean s of a hook (22) between two of said pulleys lower than or equal to the force exerted by the spring (4) of said roll-back mechanism increased by an amount equal t o the sum of the frictional forces acting on the sliding parts.</p> |
