Ladder, wide rung and method

Patent metadata

Field	Value
Publication number	US-10151144-B2
Application number	US-201615379086-A
Country	US
Kind code	B2
Filing date	Dec 14, 2016
Priority date	Dec 14, 2016
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

A ladder having a first rail and a second rail. The ladder having a standard rung having a width permanently attached to the first rail and the second rail. The ladder having a first wide rung having a width greater than the width of the standard rung, which is permanently attached to the first rail and the second rail. The ladder having a second wide rung having a width greater than the width of the standard rung, which is permanently attached to the first rail and the second rail. The first wide rung and the second wide rung are disposed in a work zone of the ladder. The work zone of the ladder is where a user typically stands on the ladder while performing tasks. The standard rung is disposed outside the work zone. A wide rung. A method for using a ladder. A method for producing a ladder.

First claim

The invention claimed is:

1. A ladder comprising:
a first rail;
a second rail;
a first rung having a width and being attached to the first and second rails;
a second rung which is hollow and being of a one piece extrusion; the second rung having a right side and a left side and a generally D-shaped cross-section formed of a top portion having a width which is wider than the width of the first rung, a front and a back, a first segment connected to and extending down from the front of the top portion, a second segment connected to and extending down from the back of the top portion, a third segment connected to and extending inward toward the back from the first segment, a fourth segment connected to and extending down from the second segment inward toward the front and connected to the third segment, a first boss adjacent the front of the top portion, a second boss adjacent the back of the top portion, and a third boss adjacent to the third and fourth segments;
a right cover attached to the right side of the second rung;
a left cover attached to the left side of the second rung, each cover having a cross-section which conforms with the cross-section of the first wide rung, a closed face having a first hole and a second hole and a third hole whose locations in the face align with the first boss and second boss and third boss, respectively, a top side that extends inward from the face in alignment with the top portion and is positioned over the top portion, a first side that extends inward from the face in alignment with the first segment and is positioned over the first segment, a second side that extends inward from the face in alignment with the second segment and is positioned over the second segment, a third side that extends inward from the face in alignment with the third segment and is positioned over the third segment, and a fourth side that extends inward from the face in alignment with the fourth segment and is positioned over the fourth segment;
right side fasteners which extend through the first rail and the first and second and third holes of the right cover and the first and second and third bosses, respectively, to attach the right side of the second rung and the right cover to the first rail;
left side fasteners which extend through the second rail and the first and second and third holes of the left cover and the first and second and third bosses, respectively, to attach the left side of the second rung and the left cover to the second rail; and
a third rung having a width greater than the width of the first rung and attached to the first and second rails; and
wherein the second and third rungs are attached to the first and second rails along one portion of the ladder and the first rung is attached to another portion of the ladder does not include the second and third rungs.

2. The ladder of claim 1 wherein the second and third rungs are the only rungs of their respective widths attached to the first and second rails.

3. The ladder of claim 2 wherein each cover is made of plastic and each of the second and third rungs are made of aluminum.

4. The ladder of claim 3 wherein each cover has a first plate extending inward from the face and in parallel and spaced relation from the top side to define a first slot in which the top portion is disposed, a second plate extending inward from the face and in parallel space relation from the third side to define a second slot in which the third segment is disposed, and a third plate extending inward from the face and in parallel and spaced relation from the fourth side to define a third slot in which the fourth segment is disposed.

5. A ladder comprising:
a first rail;
a second rail;
a first rung having a width and attached to the first and second rails;
a second rung which is hollow and being of a one piece extrusion; the second rung having a right side and a left side and a generally D-shaped cross-section formed of a top portion having a width wider than the width of the first rung and a front and a back, a first segment connected to and extending down from the front of the top portion, a second segment connected to and extending down from the back of the top portion, a third segment connected to and extending inward toward the back from the first segment, a fourth segment connected to and extending down from the second segment inward toward the front and connected to the third segment, a first boss adjacent the front of the top portion, a second boss adjacent the back of the top portion, and a third boss adjacent to the third and fourth segments;
a right rung plate attached to the right side of the second rung;
a left rung plate attached to the left side of the second rung, each rung plate having a center portion having a first center hole and a second center hole and a third center hole whose locations in the center portion align with the first boss and second boss and third boss, respectively, an upper flange that extends from and above the center portion, and a lower flange that extends from and below the center portion, the upper flange having upper flange holes and the lower flange having lower flange holes, rivets extending through the first rail and the second rail into the upper flange holes and the lower flange holes of each rung plate to attach the right rung plate and the left rung plate to the first rail and second rail, respectively, and thus the second rung to the first rail and the second rail; and
a third rung having a width greater than the width of the first rung and attached to the first and second rails, and
wherein the second and third rungs are attached to the first and second rails along one portion of the ladder and the first rung is attached to another portion of the ladder does not include the second and third rungs.

Assignees

• Mora Daniel C
• Beggs Robert D
• Werner Co

Inventors

• Mora Daniel C
• Beggs Robert D

Classifications

• E06C1/02

  with rigid longitudinal member or members · CPC title

• E06C7/08 Primary

  Special construction of longitudinal members, or rungs or other treads · CPC title

• E06C7/086

  with a connecting piece inserted in a hollow rung (E06C7/088 takes precedence) · CPC title

• E06C7/087

  with a connecting piece installed around the rung · CPC title

• E06C7/082

  Connections between rungs or treads and longitudinal members · CPC title