| 摘要 |
A folding, self-erecting ladder for use in the marine environment comprises two rigid side rails with holes for holding rungs. Bungee cord is thread through the rungs and rails to tension the rails toward each other top hold the rungs in the rail holes. The ladder can be folded by pulling the rails apart, allowing the rungs to leave the rail holes, and moving the rails closer to each other, trapping the rungs therebetween, and binding the folded ladder to hold it in the folded position. |
| 主权项 |
1. A folding ladder comprising:
first and second rails, each with inner and outer walls, a circumferential edge joining said walls, and having a top and bottom end, a plurality of hollow rungs of even or odd number with at least an upper rung and a lower rung, and means for holding said rungs in position between said rails, wherein; each said first and second rails has a plurality of rail holes to accept one end of one of said plurality of rungs, wherein; said means for holding comprises elastic cord means with first and second ends passing through each said rung and said rails to tension said first and second rails toward each other to hold said rungs into engagement with said rail holes, further wherein, each said plurality of rail holes comprises at least two sizes, a first size extending less than fully through said rail from the inner rail wall and sized to accept one said rung, and a second size, smaller than said first size, extending from said rail outer wall and meeting said first size hole, said second size chosen to allow said elastic cord means to pass therethrough but to stop said rung at an intermediate position in said rail. |
