| 摘要 |
The invention concerns a trolley (4) comprising a plate structure (6) including an outer frame consisting of side (32, 34), front (30) and rear (31) members, and a central plate (60). A free space is provided between the central plate (60) and the side members (32, 34) wherein is inserted the lower end of the vertical members (80, 81) of the back (8). Said lower end swivels in rotation about pins. The wheels (41-44) and their supports (45-48) are coupled to a second pair of side members (33, 35) which pivot about rotational axes. The rear end is provided with a lever actuated by a terminal dog point of the back side members (80, 81), whereby the side members (33, 35) are made to swivel and the wheels (41-44) are folded towards the lower face of the central plate (60). Means are provided for locking (7) the back (8) in working position, arranged beneath the central plate (60) and actuated by the vertical members (80, 81) of the back (8). Matching locking means, including cams, are provided for locking the front of the swivelling side members (30, 35). Means are also provided for flattening (51, 52) the swivelling front wheels (41, 42). |
