Multipurpose ladder and method
AssigneeWerner Co.
InventorsTek Lentine, Thomas Parker, Clint Badowski, James Hlebovy
Life of this patent
Estimating the term…
Abstract
In some embodiments, a multipurpose ladder has a first inner section. The ladder has a first articulated hinge and a second articulated hinge. The ladder has a second inner section. The ladder has a first outer section. The ladder has a first locking bar. The ladder has a second outer section. The multipurpose ladder may have a plurality of brackets disposed about outer rails of the outer sections. The brackets provide support to each of the outer rails and strengthens them against bending forces so the rails can be thinner and of lighter weight. The ladder may have an ANSI duty rating of 1 A or an ANSI duty rating of 1 AA.
Claims21
1-21. (canceled)
A ladder comprising:
- a first section having a first inner right rail, a first outer right rail disposed about the first inner right rail, and a first plurality of rungs coupled to the first inner right rail and a corresponding first inner left rail;
- a second section having a second inner right rail, a second outer right rail disposed about the second inner right rail, and a second plurality of rungs coupled to the second outer right rail and a corresponding second inner left rail;
- and
- an articulated hinge rotatably securing the first section to the second section, the articulated hinge comprising a first outer right plate assembly coupled to a first inner right plate assembly, the first outer right plate assembly including at least one outer right plate having an outer right stem portion with at least one cutout and an outer right body portion, the first inner right plate assembly including at least one inner right hinge plate having an inner right stem portion with at least one cutout and an inner right body portion, the outer right body portion coupled to the first inner right rail, and the inner right body portion coupled to the second inner right rail.
A ladder comprising:
- a first section having a first inner right rail, a first outer right rail disposed about the first inner right rail, and a first plurality of rungs coupled to the first inner right rail, the first outer right rail having an inner portion disposed adjacent the first inner right rail and an outer portion;
- a second section having a second inner right rail, a second outer right rail disposed about the second inner right rail, and a second plurality of rungs coupled to the second outer right rail;
- an articulated hinge rotatably securing the first section to the second section, the articulated hinge having at least one hinge plate with a cutout disposed therein;
- a first cross brace coupled to the first inner right rail and the first outer right rail, the first cross brace disposed adjacent a bottom end of the ladder;
- and
- a first inner bracket coupled to the inner portion of the first outer right rail at a location where the first cross brace is coupled to the first outer right rail, the first inner bracket having a shape that conforms to a cross sectional shape of the first outer right rail.
A ladder comprising:
- a first section having a first inner right rail, a first outer right rail disposed about the first inner right rail, and a first plurality of rungs coupled to the first inner right rail;
- a second section having a second inner right rail, a second outer right rail disposed about the second inner right rail, and a second plurality of rungs coupled to the second outer right rail;
- an articulated hinge rotatably securing the first section to the second section, the articulated hinge having at least one hinge plate with a cutout disposed therein;
- and
- at least one rung of the first plurality of rungs including a top portion with a top flange, a bottom portion with a bottom flange, and hollow center portion disposed between the top flange and the bottom flange, the top portion having a top web extending between the hollow center portion and the top flange, and the bottom portion having a bottom web extending between the hollow center portion and the bottom flange.
Dependencies are inferred from the claim text.