Light weight ladder systems and methods

• US 7,086,499 B2
• Filed: 03/04/2005
• Issued: 08/08/2006
• Est. Priority Date: 04/05/2002
• Status: Expired due to Fees

• Current Assignee: Wing Enterprises Incorporated
• Original Assignee: Wing Enterprises Incorporated
• Inventors: Moss, Newell Ryan
• Primary Examiner(s): THOMPSON, HUGH B
• Application Number:
  US11/073,321
• Publication Number:
  US 20050145437A1
• Time in Patent Office: 522 Days
• Field of Search: 182/228.1, 182/228.3, 182/228.4, 182 20- 26, 182/165, 182/166, 182/167, 182/207, 182/208, 182/194, 182/201, 182/203, 295/23, 295/12, 403/243, 403/281, 403/282
• US Class Current: 182/23
• CPC Class Codes: E06C 1/32 Ladders with a strut which is formed as a ladder and can be secured in line with the ladder
• CPC Class Codes: E06C 7/081 Rungs or other treads comprising anti-slip features
• CPC Class Codes: E06C 7/084 Rungs comprising projecting tabs or flanges
• CPC Class Codes: E06C 7/085 achieved by deforming the rung or the stile E06C7/084 takes precedence

Abstract

A method for manufacturing a rail for a ladder. The method may include pultruding in a longitudinal direction, a rail having a selected cross-sectional shape. The rail may then be cut to a predetermined length at a distal end. A force may be applied, in a lateral direction, to the rail to form a curvature therein. The curvature may be characterized by a flared portion, a straight portion, and a curved region providing the transition therebetween. The rail may be held at the desired curvature for a time selected for the rail to take on the curvature substantially permanently. The force may then be removed and the rail may be assembled into a ladder.

Claims

1. A ladder comprising:

a first rail having a first wall and a second wall spaced therefrom, a first opening in the first wall and a second opening in the second wall, wherein the first opening exhibits a first cross-sectional area and the second opening exhibits a second cross-sectional area smaller than the first cross-sectional area;

at least one rung having a first portion thereof extending through the first opening in the first wall and through the second opening in the second wall, a first end of the first portion of the at least one rung being swaged adjacent a first surface of the second wall; and

a support member adjacent the first portion of the at least one rung and abutting a second, opposing surface of the second wall, the support member including a collar substantially surrounding at least a segment of the first portion of the at least one rung.

2. The ladder of claim 1, wherein the collar extends through the first opening and abuts the second, opposing surface of the second wall at a location adjacent the second opening.

3. The ladder of claim 2, wherein the at least one rung includes a shoulder portion adjacent the first portion and wherein the collar abuts the shoulder portion such that the collar is confined between the shoulder portion of the at least one rung and the second, opposing surface of the second wall.

4. The ladder of claim 3, further comprising a second rail spaced from the first rail and coupled to a second end of the at least one rung.

5. The ladder of claim 4, wherein the at least one rung includes a plurality of rungs.

6. The ladder of claim 5, further comprising a third rail and a fourth rail, wherein the first rail is slidingly coupled to the third rail and wherein the second rail is slidingly coupled to fourth rail.

7. The ladder of claim 6, further comprising another plurality of rungs coupled between the third rail and the fourth rail.

8. The ladder of claim 1, wherein the first portion of the at least one rung comprises a substantially cylindrical member, and wherein the first opening and the second opening each exhibit substantially circular geometries.

9. A method of forming a ladder, the method comprising:

providing a first rail having a first wall and a second wall spaced from the first wall;

defining a first opening in the first wall of the first rail;

defining a second opening in the second wall of the first rail;

defining a cross-sectional area of the first opening to be larger than a cross-sectional area of the second opening;

extending a first portion of a first rung through the first opening and through the second opening;

disposing a support member adjacent the first portion of the first rung including abutting a first surface of the second wall with the support member; and

swaging a first end of the first rung adjacent a second, opposing surface of the second wall.

10. The method according to claim 9, further comprising forming the first portion of the first rung as a substantially cylindrical member.

11. The method according to claim 10, further comprising forming the support member as a collar substantially surrounding at least a segment of the first portion of the first rung.

12. The method according to claim 11, further comprising forming a shoulder on the first rung adjacent the first portion and abutting the collar against the shoulder so as to confine the collar between the shoulder and the first surface of the second wall.

13. The method according to claim 12, further comprising providing a second rail and coupling a second end of the first rung to the second rail.

14. The method according to claim 13, further comprising coupling at least one other rung between the first rail and the second rail.

15. The method according to claim 14, further comprising slidingly coupling a third rail to the first rail and slidingly coupling a fourth rail to the second rail.

16. The method according to claim 15, further comprising coupling a plurality of rungs between the third rail and the fourth rail.

17. The method according to claim 12, further comprising:

coupling a first hinge to an end of the first rail;

coupling a second hinge to an end of the second rail;

coupling a third rail to the first hinge;

coupling a fourth rail to the second hinge; and

coupling a plurality of rungs between the third rail and the fourth rail.