Ladders, mechanisms and components for ladders, and related methods

Patent metadata

Field	Value
Publication number	US-12448844-B2
Application number	US-202217826830-A
Country	US
Kind code	B2
Filing date	May 27, 2022
Priority date	Oct 5, 2016
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

Ladders and ladder components are provided including feet for ladders configured for securement of the ladder to a supporting surface, adjustable leg members for ladders, bearing members for ladders, and adjustment mechanisms for ladders. In one embodiment, an adjustment mechanism may include a first pair of spaced apart rails, a pair of adjustable legs having a first end hingedly coupled to one of a pair of adjustment mechanisms and a second end coupled with a foot. The adjustment mechanisms may be slidably coupled with the rails and in one embodiment, each adjustment mechanism is selectively displaceable along a length of its associated rail only when upward force is absent from the adjustment mechanism, the upward force being defined in a direction from a lower end of the associated rail towards the adjustment mechanism.

First claim

What is claimed is:

1. A ladder comprising:
a first assembly having a first pair of rails spaced apart from each other and a first plurality of rungs extending between, and coupled to, the first pair of rails;
a second assembly having a second pair of rails spaced apart from each other and a second plurality of rungs extending between, and coupled to, the second pair of rails, the first assembly being slidably coupled with the second assembly;
at least one bearing member coupled to a first rail of the first pair of rails, the at least one bearing member having a body portion disposed within a recess of the first rail and having an elongated L-slot formed within the body portion, the elongated L-slot matingly and slidingly engaging a first rail of the second pair of rails, wherein the elongated L-slot includes a lateral shoulder portion having a bearing surface angled relative to a lateral axis, the lateral axis extending through each of the first pair of rails substantially parallel to a longitudinal dimension of a rung of the first plurality of rungs, the bearing surface being configured to engage at least one of a front flange surface of the first rail of the second pair of rails or a rear flange surface of the first rail of the second pair of rails.

2. The ladder of claim 1 , wherein the bearing surface has a radius of curvature about an axis substantially perpendicular to a longitudinal dimension of the elongated L-slot.

3. The ladder of claim 2 , wherein the elongated L-slot includes a leg section having a radius of curvature about the axis substantially perpendicular to the longitudinal dimension of the elongated L-slot.

4. The ladder of claim 1 , wherein the at least one bearing member is positioned at an end of the first rail of the first pair of rails.

5. The ladder of claim 1 , wherein the elongated L-slot extends parallel to a longitudinal axis of the first rail of the first pair of rails.

6. The ladder of claim 1 , wherein the lateral shoulder portion extends laterally inwardly relative to the first rail of the first pair of rails.

7. The ladder of claim 1 , wherein the at least one bearing member comprises a metal reinforcement molded into or disposed on or within the body portion.

8. The ladder of claim 1 , wherein the first rail of the second pair of rails includes a lip member, and the at least one bearing member engages the lip member.

9. The ladder of claim 1 , wherein the at least one bearing member includes an arcuate support surface.

10. A ladder, comprising:
a base assembly having a first pair of rails and a first plurality of rungs extending between and coupled to the first pair of rails, at least one rail of the first pair of rails having a channel extending perpendicular to at least one rung of the first plurality of rungs and opening at an end of the at least one rung;
a fly assembly having a second pair of rails and a second plurality of rungs extending between and coupled to the second pair of rails;
a bearing member positioned in the end of the at least one rail and having a longitudinal slot receiving a second rail of the second pair of rails, the longitudinal slot having a radius of curvature along a longitudinal dimension of the longitudinal slot, wherein the radius of curvature is defined about an axis parallel to the first plurality of rungs.

11. The ladder of claim 10 , wherein the longitudinal slot includes a lateral shoulder portion having a bearing surface angled relative to a lateral axis of the bearing member.

12. The ladder of claim 10 , wherein the longitudinal slot is L-shaped.

13. The ladder of claim 10 , wherein the longitudinal slot matingly and slidingly engages the second rail.

14. The ladder of claim 10 , wherein the longitudinal slot is wider at a first longitudinal end of the bearing member than at a second longitudinal end of the bearing member.

15. A ladder comprising:
a first assembly having a first pair of rails spaced apart from each other and a first plurality of rungs extending between, and coupled to, the first pair of rails;
a second assembly having a second pair of rails spaced apart from each other and a second plurality of rungs extending between, and coupled to, the second pair of rails, the first assembly being slidably coupled with the second assembly;
at least one bearing member coupled to a first rail of the first pair of rails, the at least one bearing member having a body portion disposed within a recess of the first rail and having an elongated L-slot formed within the body portion, the elongated L-slot matingly and slidingly engaging a first rail of the second pair of rails, wherein the elongated L-slot includes a lateral shoulder protruding laterally inward toward a second rail of the first pair of rails beyond any other portion of the at least one bearing member.

16. The ladder of claim 15 , wherein the elongated L-slot is wider at one longitudinal end of the at least one bearing member than at an opposite longitudinal end of the at least one bearing member.

17. The ladder of claim 15 , wherein the lateral shoulder is angled relative to a lateral inward direction from the at least one bearing member.

18. The ladder of claim 15 , wherein the lateral shoulder exhibits a radius of curvature relative to an axis perpendicular to a longitudinal axis of the first rail of the first pair of rails.

Assignees

• Little Giant Ladder Systems Llc

Inventors

• Major Aaron Bruce
• Maxfield Bradley Scott
• Jonas Gary M
• Russell Brian B
• Moss N Ryan

Classifications

• E06C7/46

  Non-skid equipment · CPC title

• E06C1/12

  extensible, e.g. telescopic · CPC title

• E06C7/44

  Means for mounting ladders on uneven ground · CPC title

• E06C7/00

  Component parts, supporting parts, or accessories · CPC title

• E06C7/50

  Joints or other connecting parts · CPC title