| 摘要 |
Under the plate (4), and close and parallel to the hinge axis (10) there can be a guide roller (17) supporting the part of the mat below the plate. Near its edge which is uppermost in the extended position the plate can hinge on a frame, while at the underside there can be supporting wheels, via which it is movable at right angles to the hinge axis. There can be a guide roller above the plate and near the hinge axis, and under which the mat is laid when the plate sections are moving from the extended to the folded position.
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