| 摘要 |
<p>The pair has a crossbar (1) whose end includes a gutter and a bolt, where the other end of the crossbar includes a cut (23) and another bolt. Another crossbar includes an end with a cut in which the gutter is inserted, and another end with a pin integrated to an axle of the latter crossbar and inserted in a housing of the former crossbar. The former bolt is released to integrate the pair and to facilitate transport of the pair. Each crossbar includes two articulations (2, 3) in which beveled upper ends of feet (4, 4', 5, 5') are housed, where the articulations are articulated.</p> |
