| 摘要 |
1,256,239. Folding ladder. G. LOIX. 20 Dec., 1968 [27 Dec., 1967; 26 June, 1968], No. 60829/68. Heading E1S. A ladder which is foldable in the plane of the ladder comprises two L-section stiles 1, 13 with ribs between which are pivotally mounted rungs 27 by rods 29 and 30. When folded the L-sections form a closed rectangle and means are provided which maintain the ladder in the folded and unfolded positions. One stile 1 may be fixed to a wall and a folding handrail 33 may be provided, attached by rods 34. The ladder may be maintained in a folded position by a nose 75 engaging a projection on a slider 53 which is mounted in channel section mounting means 45 which is fixed to stile 1 by screw 52. To unfold the ladder shaft 72 is rotated by a handle which shaft turns rachet wheel 66 and this moves slider 53 which disengages the projection on 53 from the nose 75. On continued rotation of shaft 72 pusher 69 is rotated and pushes stile 13 away from stile 1. Return springs are provided which cause the pusher member to return to its normal position (Fig. 10). The ladder may be provided with an alarm device when used as a fire escape and also a signalling means for use when the ladder is moved from its folded to unfolded position. The ladder may be used as a portable ladder and it may be made from reinforced polyester or aluminium-silicon alloys. In the closed position the tube formed by the abutting stiles may be closed with a cap. |
