| 摘要 |
<p>It is described a foldable articulated arm (1) comprising a first rod- shaped element (2), a second rod- shaped element (3) and a third rod- shaped element (4) foldable one another and at least three stretching element of the rod- shaped elements, arranged to form a system of four - bar linkages, further comprising a plurality of joint elements (8) of the rod- shaped elements and the stretching elements and having, at the opposite ends, retaining means ( 9 ) for a respective combining with a tube and an umbrella sheet, wherein the rod- shaped elements, the joint elements, the stretching elements and the retaining means are all made integral in a single piece of plastic material constituting the foldable articulated arm.</p> |
