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US 11,851,949 B2Granted
Multipurpose ladder and method
AssigneeWerner Co.
InventorsTek Lentine, Thomas Parker, Clint Badowski, James Hlebovy
Life of this patent
Estimating the term…
Abstract
A multipurpose ladder having 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 1A or an ANSI duty rating of 1AA. A method for using a multipurpose ladder. A method for producing a multipurpose ladder.
Claims22
A multipurpose ladder comprising:
- a first inner section having a first inner right rail, a first inner left rail in parallel and spaced relation with the first inner right rail and a plurality of first inner rungs attached to the first inner left rail and the first inner right rail;
- a first outer section having a first outer right rail, and a first outer left rail in parallel and spaced relation with the first outer right rail and a plurality of first outer rungs attached to the first outer left rail and the first outer right rail, the first outer right rail disposed about the first inner right rail, the first outer right rail having a bend of at least 7° outward relative to the first inner right rail which defines a lower portion of the first outer right rail below the bend;
- a first locking bar attached to the first outer section which locks the first inner right rail in place relative to the first outer right rail in a locked state and allows the first inner right rail to slide relative to the first outer right rail in an unlocked state;
- a first bracket that at least partially surrounds the first outer right rail, an entirety of the first bracket positioned above the first locking bar;
- a second bracket that at least partially surrounds the first outer right rail, an entirety of the second bracket positioned below the first locking bar and above a second highest of the plurality of first outer rungs;
- and
- a third bracket that at least partially surrounds the first outer right rail, an entirety of the third bracket positioned below the second highest of the plurality of first outer rungs.
4 more elements
A ladder comprising:
- a first inner section having a first inner right rail, a first inner left rail in parallel and spaced relation with the first inner right rail and a plurality of first inner rungs attached to the first inner left rail and the first inner right rail;
- a second inner section having a second inner right rail, and a second inner left rail in parallel and spaced relation with the second inner right rail and a plurality of second inner rungs attached to the second inner left rail and the second inner right rail;
- a first outer section having a first outer right rail, and a first outer left rail in parallel and spaced relation with the first outer right rail and a plurality of first outer rungs attached to the first outer left rail and the first outer right rail, the first outer right rail having a bend of at least 7° outward relative to the first inner right rail which defines a lower portion below the bend;
- a second outer section having a second outer right rail, and a second outer left rail in parallel and spaced relation with the second outer right rail and a plurality of second outer rungs attached to the second outer left rail and the second outer right rail, the second outer right rail disposed about the second inner right rail with the second inner right rail sliding up and down relative to the second outer right rail;
- a plurality of brackets disposed about the first outer right rail, and the first outer left rail, and the second outer right rail, and the second outer left rail, the plurality of brackets providing support to each of the outer right rails and outer left rails and strengthens them against bending forces;
- and
- a reinforcement plate disposed between the first outer right rail and the first inner right rail, the reinforcement plate conforming to a web of the first outer right rail, the reinforcement plate further having a bend aligned with the bend of the first outer right rail.
4 more elements
A multipurpose ladder comprising:
- a first inner section having a first inner right rail, a first inner left rail in parallel and spaced relation with the first inner right rail and a plurality of first inner rungs attached to the first inner left rail and the first inner right rail;
- a first outer section haying a first outer right rail, and a first outer left rail in parallel and spaced relation with the first outer right rail and a plurality of first outer rungs attached to the first outer left rail and the first outer right rail, the first outer right rail disposed about the first inner right rail, the first outer right rail having a bend of at least 7° outward relative to the first inner right rail which defines a lower portion below the bend;
- a plurality of brackets disposed about the first outer right rail, and the first outer left rail, the plurality of brackets providing support to each of the outer right rails and outer left rails and strengthens them against bending forces;
- and
- a reinforcement plate disposed inside and in contact with the first outer right rail and in alignment with the first outer right rail, the reinforcement plate and the first outer right rail each having an upper section and a bend connected to the upper section, and a lower section connected to the bend with the bend between the upper section and the lower section, the bend of the reinforcement plate and the bend of the first outer right rail being in contact, the upper section of the reinforcement plate and the upper section of the first outer right rail being in contact, the lower section of the reinforcement plate and the lower section of the first outer right rail being in contact.
2 more elements
Dependencies are inferred from the claim text.