US 12,134,936 B2
Composite rung for a ladder
Daniel C. Mora, Transfer, PA (US)
Assigned to Werner Co., Greenville, PA (US)
Filed by Werner Co., Greenville, PA (US)
Filed on Aug. 27, 2020, as Appl. No. 17/005,084.
Application 17/005,084 is a division of application No. 14/446,024, filed on Jul. 29, 2014, granted, now 10,760,335.
Prior Publication US 2021/0025231 A1, Jan. 28, 2021
Int. Cl. E06C 7/08 (2006.01); B21J 15/02 (2006.01); F16B 5/04 (2006.01)
CPC E06C 7/082 (2013.01) [B21J 15/02 (2013.01); E06C 7/084 (2013.01); E06C 7/08 (2013.01); F16B 5/04 (2013.01)] 12 Claims
OG exemplary drawing
 
8. 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.