| 摘要 |
<p>This is a new system for opening and closing the canvas, its main characteristic being: the speed of opening/closing, completely secure attachment and the low cost, together with qualities of reliability, ease of use, lack of need for maintenance and great sturdiness. The fundamental innovations relate to: the tracks on which the crossmembers supporting the canvas travel, the system of separation between the crossmembers which also serves to lift the fabric when opened, and the mechanism of opening/closing using a chain with links operated by a single simple crank. <IMAGE></p> |
