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US 12,134,936 B2Granted
Composite rung for a ladder
AssigneeWerner Co.
InventorDaniel C. Mora
Life of this patent
Estimating the term…
Abstract
A ladder having a first fiberglass rail. The ladder having a second fiberglass rail. The ladder having a one-piece composite rung which is hollow and made of carbon fiber or glass. The rung has a middle and a first end and a second end. The ladder having rivets that extend through the first end and the second end of the rung to attach the rung to the first rail and the second rail. No portion of the rung penetrates any portion of the first or second rails.
Claims12
A ladder comprising:
- a first rail having a first web with a first inner face;
- a second rail having a second web with a second inner face;
- and
- a rung with a middle portion that is hollow and extends between and to a first flange of the rung and a second flange of the rung that is parallel to and spaced from the first flange, the first flange coupled to the first inner face and the second flange that is coupled to the second inner face, the middle portion of the rung including:
- a first set of fiber layers impregnated with a thermoset or thermoplastic polymer, the first set of fiber layers aligned parallel to each other in a single direction along a length of the middle portion of the rung, the first set of fiber layers including first end portions forming at least a portion of the first flange that extends at an angle relative to the middle portion and second end portions forming at least a portion of the second flange;
- wherein the first flange includes a second set of fiber layers impregnated with the thermoset or thermoplastic polymer, the second set of fiber layers interleaved with the first end portions of the first set of fiber layers;
- and
- wherein the second flange includes a third set of fiber layers impregnated with the thermoset or thermoplastic polymer, the third set of fiber layers interleaved with the second end portions of the first set of fiber layers.
5 more elements
A rung comprising:
- a first flange;
- a second flange that is parallel to and spaced from the first flange;
- and
- a middle portion that is hollow and extends between and to the first flange and the second flange, the middle portion including:
- a first set of fiber layers impregnated with a thermoset or thermoplastic polymer, the first set of fiber layers aligned parallel to each other in a single direction along a length of the middle portion of the rung, the first set of fiber layers including first end portions forming at least a portion of the first flange that extends at an angle relative to the middle portion and including second end portions forming at least a portion of the second flange;
- wherein the first flange includes a second set of fiber layers impregnated with the thermoset or thermoplastic polymer, the second set of fiber layers interleaved with the first end portions of the first set of fiber layers;
- and
- wherein the second flange includes a third set of fiber layers impregnated with the thermoset or thermoplastic polymer, the third set of fiber layers interleaved with the second end portions of the first set of fiber layers.
5 more elements
Dependencies are inferred from the claim text.