| 摘要 |
<p>Supports, during raising or lowering, can slide in profiles on a carriage, the wheels of which, in nylon or similar plalstics, are enclosed by the U-shaped part of the profile. The body forming the connection between wheels and supports projects partly through a slot of the profile and is made of nylon or similar plastic. Specifically, the outside of the wheels is convex and the roller on which the fabric is rolled-up is supported by wheels of nylon or similar plastics which are attached to a sprung fixture.</p> |
