| 摘要 |
It consists of a folding structure (2), to which one or more rollers (3) are coupled, which is constituted by an articulated one-piece construction, formed of a plurality of straight sections (2a, 2b) joined together by means of articulated joints that rotate around a vertical axis (4) and movement of the sections on the horizontal plane, and hinged joints that rotate around a horizontal axis (5) and movement of the sections on the vertical plane. In its use position, it has a rectangular frame shape, while in its folded position it forms an elongated and flat compact block. The upper part of the structure (2) has recesses (8) with protruding nipples (9), suitable for being inserted into holes (10) made on the ends (3a) of the roller (3) axis; while dampers (11) made of anti-slip material are disposed in the lower part thereof. There is an joint that rotates around a vertical axis (4) with an angle of rotation of up to 270° in each of the joints between transverse (2a) and longitudinal (2b) sections, and another hinged joint that rotates around a horizontal axis (5) with an angle of rotation of up to 180° between the longitudinal (2b) sections. It is susceptible to being folded in half and then back upon it itself along its minor central axis. |
