| 摘要 |
<p>PURPOSE:To prevent the operating force from becoming large and to reduce the cost by providing projectingly a pair of direction converting links in the horizontal direction of an operating shaft, connecting them to an operating pin of a moving member, and also, connecting a driving link between the direction converting link of the other side and a push-up arm through spherical bearing parts provided on both ends, respectively. CONSTITUTION:When a crank handle 5a of one side is brought to rotational operation in the prescribed direction and a screw shaft 4a is rotated, a moving member 6a moves upward along the screw shaft 4a, therefore, a direction converting link 8a of one side turns in the width direction of a bed frame 1 since a long groove 10a part is driven by an operating pin 11a. In such a way, by turning of the direction converting link 8a of one side, an operating shaft 7a is turned counter-clockwise, and a direction converting link 9a of the other side turns in the longitudinal direction of the bed frame 1. In such a way, by turning of the direction converting link 9a of the other side, a driving link 13a is driven in the left direction, and by being pushed by the driving link 13a, a push-up arm moves in the left direction. Accordingly, a floorboard 2 turns clockwise around a supporting point 15a supported by the bed frame 1 and ascends.</p> |
