| 摘要 |
The device comprises two crossmembers (1, 2) intended to be fixed to the base of a bed, the first (1) of which bears, at one of these ends, a part forming a stationary support (3) and, at the other end, a wheel (5). The second crossmember (2) bears two more wheels (6, 7) and all the wheels (5-7) are mounted in such a way that the extension of their axes of rotation passes substantially through the part forming a stationary support (3). <IMAGE>
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