| 摘要 |
1475324 Vehicle loading platform JOHN RATCLIFF (TALL LIFTS) Ltd 7 April 1975 [11 April 1974] 16393/74 Heading B8E The vehicle load lifting unit of Specification 1,220,757 shown in Fig. 1 is modified by the provision of an inextensible tie member 28 pivotally connected between the platform 9 and the lower swinging link 7 of the parallel linkage 5 the pivots being on the same side of the platform pivot so that as the linkage 5 is swung to its inoperative position as described in the prior patent the platform 9 is swung up vertically by the tie connection to an inoperative position towards the vehicle interior. In a modified unit, Fig. 2, a secondary ram 39 is pivotally connected between a pivot 41 on the arm 34 supporting the platform 5 and an extension 37 of the platform. The inextensible tie 38 extends between the point 37 a point 36 on the lower link 33 of the parallelogram support linkage. To stow the platform the actuating ram raises the unit beyond the vehicle platform height until a limit switch stops the lifting ram and brings into operation the secondary ram 39 which folds up the platform 5 and through the tie 38 the support linkage until projections 45 are positioned over hooks 46 which are engaged to hold the parts folded when the unit is again slightly lowered. To aid folding of the platform 5 a torsion bar tensions the pivot 42 or another pivot to urge the platform into a vertical folded position.
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