| 摘要 |
The present invention relates to a cart comprising a substantially rectangular surface, provided with wheels for moving the cart over a ground surface, a first pair of bars rotatable around a first rotation axis extending substantially along a first side of the surface, wherein the bars extend from the first rotation axis with a directional component transversely of the first rotation axis and are situated at a distance from each other and each at a distance from the sides adjacent to the first side, a second pair of bars rotatable around a second rotation axis extending substantially along a second side of the surface opposite the first side, wherein the bars extend from the rotation axis with a directional component transversely of the second rotation axis and are situated at a distance from each other and each at a distance from the sides adjacent to the second side, and locking means for blocking or releasing the rotation axes of the bars. |
