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US 2006/0076190 A1Published application
Step ladder
OwnerVernon Craininventor
Life of this patent
Estimating the term…
Abstract
A spreader assembly having spreader beams respectively bendable about a common central pivot provides a step ladder of simple construction for convenient use.
Claims2
A spreader for a step ladder, said step ladder comprising a back leg and at least two stiles, said stiles being a pivotally attached at one end to said back leg, said spreader comprising:
- (a) a first spreader beam including a first beam pivotally attached at a first end to a stile and attached at a second end to a first end of a second beam by a center pivot, said second beam being pivotally attached at a second end to said back leg;
- and
- (b) a second spreader beam including a third beam pivotally attached at a first end to another stile and attached at a second end to a first end of a fourth beam by a center pivot, said fourth beam being pivotally attached at a second end to said back leg and said center pivot of said second spreader beam being affixed to said center pivot of said first spreader beam.
A step ladder comprising:
- (a) a plurality of spaced apart stiles, each stile extending between a first end and a foot arranged to engage a stile supporting surface;
- (b) a plurality of spaced apart treads having a first end and a second end, said treads affixed to a stile at each of said first and said second ends;
- (c) a first back leg pivotally attached to said first end of a first stile;
- (d) a second back leg pivotally attached to said first end of a second stile;
- (e) a first spreader beam including a first beam pivotally attached at a first end to said first stile and attached at a second end to a first end of a second beam by a center pivot, said second beam being pivotally attached at a second end to said first back leg;
- and
- (f) a second spreader beam including a third beam pivotally attached at a first end to said second stile and attached at a second end to a first end of a fourth beam by a center pivot, said fourth beam being pivotally attached at a second end to said second back leg and said center pivot of said second spreader beam being affixed to said center pivot of said first spreader beam.
4 more elements
Dependencies are inferred from the claim text.