Extendable a-frame ladder for uneven surfaces
OwnerJohn B. Waldeninventor
Life of this patent
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Abstract
The invention is an improvement to an A-frame ladder, adding to an A-frame ladder independent extension means allowing the ladder to be placed on uneven surfaces, stairs or level surfaces in a stable and level configuration, the improvement adding a sliding ladder segment attached to the A-frame ladder segments, locking bars on the sliding ladder segments spaced apart along the sliding ladder segments, sliding bracket mounts attaching each sliding ladder segment to the A-frame ladder segments, and pivoting spring-loaded locking catches securing the sliding ladder segment to the A-frame ladder segments.
Claims3
An improvement to an A-frame ladder, the improvement comprising:
- a sliding ladder segment attached to A-frame ladder segments included on the A-frame ladder;
- a plurality of locking bars on the sliding ladder segments spaced apart along each sliding ladder segment;
- sliding bracket mounts attaching each sliding ladder segment to each A-frame ladder segment;
- and
- pivoting spring-loaded locking catches securing each sliding ladder segment to each A-frame ladder segment.
An improvement to an A-frame ladder having a top plate with a plurality of slots, trays and grooves, two A-frame ladder segments, having an inside surface and an outside surface, including two side rails and a plurality of spaced rungs configured in a flat plane for standing, the A-frame ladder segments attached to the top plate, a pivotally attached securing bar preventing separation of the two A-frame segments past a certain angle, having a locking means to prevent disengagement of the securing bar during use, the improvement comprising:
- a. sliding ladder segments, having an outside surface and an inside surface, slidably engaging the outside surface of each A-frame ladder segment by sliding bracket mounts affixed to each sliding ladder segment, such sliding ladder segment having two side rails with a plurality of spaced rungs configured in a flat plane connecting the two side rails;
- b. a channel locking means included in the two side rails which engages a channel ridge means included in the side rails of the A-frame ladder segments;
- c. a plurality of locking bars and spaced rungs on the inside surface of the sliding ladder segments;
- and
- d. pivoting spring-loaded locking catches on the inside surface of each side rail of the A-frame ladder segments engaging the locking bars of the sliding ladder segments, retaining the sliding ladder segments in a fixed position with the A-frame ladder segments, wherein each sliding ladder segment is independant from the other sliding ladder segment, allowing the sliding ladder segments to be positioned on different levels or on the same level.
Dependencies are inferred from the claim text.