Ladder system including a caster bracket and method of forming

• US 5,653,306 A
• Filed: 03/06/1996
• Issued: 08/05/1997
• Est. Priority Date: 08/12/1993
• Status: Expired due to Term

• Current Assignee: Werner Technologies, Inc.
• Original Assignee: Werner Company (New Werner Holding Company Incorporated)
• Inventors: Bendickson, Roy B., Smith, Jay P.
• Primary Examiner(s): CHIN SHUE, ALVIN C
• Application Number:
  US08/611,281
• Time in Patent Office: 517 Days
• Field of Search: 182/15, 182/17, 16/29
• US Class Current: 182/15
• CPC Class Codes: E06C 1/39 Ladders having platforms; Ladders changeable into platforms platforms for use on ladders E06C7/16
• CPC Class Codes: E06C 1/397 characterised by having wheels, rollers, or runners

Abstract

A ladder system comprising a ladder having side rails and a plurality of steps disposed between the side rails. The ladder system also is comprised of at least one corner brace for supporting a bottom step of the ladder. The corner brace is attached to a side rail of the ladder and the bottom step. Additionally, the ladder system is comprised of at least one caster assembly integrally attached to the corner brace for allowing the ladder to roll. Preferably, the caster assembly and corner brace are disposed on the ladder such that a predetermined weight placed on the ladder prevents the ladder from rolling. The corner brace is preferably comprised of a first portion, a second portion connected to the first portion and a third portion connected to the second portion. The first portion is attached to a bottom of the ladder. The second portion is attached to the caster assembly. Additionally, the third portion is attached to a rail of the ladder. A caster apparatus comprises a corner brace for supporting a bottom step of a ladder. The caster apparatus is also comprised of a caster assembly integrally attached to the corner brace for allowing the ladder to roll. A method for forming a ladder system. The method comprises the steps of attaching a caster assembly to a corner brace for a ladder such that the caster assembly is in biased sliding relationship with the corner brace. Then, there is the step of fixing the corner brace having the caster assembly to a bottom step of the ladder and to a side rail of the ladder such that the rail is maintained off of ground by the caster assembly when there is essentially no weight on the ladder. Preferably, after the fixing step, there is the step of rolling the ladder on the caster assembly to a desired location.

Claims

1. A caster apparatus for a ladder comprising:

a corner brace for supporting a bottom step of a ladder, said corner brace moving a housing configured to attached to a side rail of the ladder and a first portion upwardly extending from the housing and configured to attach to the bottom step at a location of the bottom step separated and apart from said rail; and

a caster assembly integrally attached to the housing for allowing the ladder to roll and allowing the side rails of the ladder to contact ground and support a user when the user is on the ladder.

2. A caster apparatus as described in claim 1 wherein the caster assembly is only connected to the corner brace.

3. A caster apparatus as described in claim 2 including a ladder and wherein the caster assembly and corner brace are disposed such that a predetermined weight placed on the ladder prevents the ladder from rolling on the caster assembly.

4. A caster apparatus as described in claim 3 wherein the corner brace is comprised of said first portion, and said housing comprising a second portion connected to the first portion and a third portion connected to the second portion, said first portion attached to a bottom step of the ladder at the location on the bottom step separate and apart from said rail, said second portion attached to the caster assembly, said third portion attached to said rail of the ladder.

5. A caster apparatus as described in claim 4 wherein the first, second and third portions are one continuous piece.

6. A caster apparatus as described in claim 4 wherein the caster assembly is comprised of a caster stem extending in a supported sliding relationship through the second portion, a caster attached to a first end of the caster stem, a spring disposed around the caster stem for biasing the caster stem in an extended position, and a pin connected through the caster stem for compressing the spring as the caster stem slides through the second portion as a result of weight being placed on the ladder, said spring contained by the pin and second portion.

7. A caster apparatus as described in claim 6 wherein the first portion is comprised of a stem having a first end and a second end, said first end connected to and extending from the second portion and said second end connected to the bottom step;

said second portion is comprised of a first and second sides each having an opening through which the caster stem slidably extends, said first and second sides in spaced relationship with each other; and

said third portion connected to said first side.

8. A caster apparatus as described in claim 7 wherein the third portion is a connector which extends from the second side and connects to the side rail.

9. A ladder system comprising:

a ladder having side rails and a plurality of steps disposed between the side rails;

at least one brace for supporting a bottom step of the ladder, said corner brace having a housing attached to a side rail of the ladder and a first portion upwardly extending from the housing attached to the bottom step at a location on the bottom step separated and apart from said side rail; and

at least one caster assembly integrally attached to the housing for allowing the ladder to roll and allowing the side rails of the ladder to contact ground and support a user when the user is on the ladder.

10. A ladder system as described in claim 9 wherein the caster assembly and corner brace are disposed on the ladder such that a predetermined weight placed on the ladder prevents the ladder from rolling on the caster assembly.

11. A ladder system as described in claim 10 wherein the ladder is comprised of a first side and a second side, said first side having a first rail and a second rail connected by a plurality of steps including a first bottom step, said second side connected to the first side, and having a third rail and a fourth rail connected by a plurality of steps including a second bottom step, said first bottom step having a first end connected to a first corner brace with a first caster assembly and a second end connected to a second corner brace with a second caster assembly, said second bottom step having a first end connected to a third corner brace with a third caster assembly and a second end connected to a fourth corner brace with a fourth caster assembly.

12. A ladder system as described in claim 11 wherein each corner brace is comprised of a first portion, a second portion connected to the first portion and a third portion connected to the second portion, said first portion attached to a bottom step of the ladder at the location on the bottom step separate and apart from said rail, said second portion attached to the caster assembly, said third portion attached to a rail of the ladder.

13. A ladder system as described in claim 12 wherein the first, second and third portions are one continuous piece.

14. A ladder system as described in claim 13 wherein each caster assembly is comprised of a caster stem extending in a supported sliding relationship through the second portion, a caster attached to a first end of the caster stem, a spring disposed around the caster stem for biasing the caster stem in an extended position, and a pin connected through the caster stem for compressing the spring as the caster stem slides through the third portion as a result of weight being placed on the ladder, said spring contained by the pin and the second portion.

15. A ladder system as described in claim 14 wherein the first portion is comprised of a stem having a first end and a second end, said first end connected to and extending from the second portion and said second end connected to the bottom step, said second portion comprising first and second sides each having an opening through which the caster stem slidably extends, said first and second sides in spaced relationship with each other and said third portion connected to said first side.

16. A caster apparatus for a ladder comprising:

a corner brace for supporting a bottom step of a ladder, said corner brace configured to attach to a side rail of the ladder and to the bottom step at a location on the bottom step separate and apart from said rail; and

a caster assembly integrally attached to the corner brace for allowing the ladder to roll and allowing the side rails of the ladder to contact ground and support a user when the user is on the ladder, said caster assembly and corner brace are disposed such that a predetermined weight placed on the ladder prevents the ladder from rolling on the caster assembly, said corner brace is comprised of a first portion, a second portion connected to the first portion and a third portion connected to the second portion at the location on the bottom step separate and apart from said rail, said first portion attached to a bottom step of the ladder, said second portion attached to the caster assembly, said third portion attached to said rail of the ladder, said caster assembly is comprised of a caster stem extending in a supported sliding relationship through the second portion, a caster attached to a first end of the caster stem, a spring disposed around the caster stem for biasing the caster stem in an extended position, and a pin connected through the caster stem for compressing the spring as the caster stem slides through the second portion as a result of weight being placed on the ladder, said spring contained by the pin and second portion.

17. A ladder system comprising:

a ladder having side rails and a plurality of steps disposed between the side rails;

at least one corner brace for supporting a bottom step of the ladder, said corner brace attached to a side rail of the ladder and the bottom step at a location on the bottom step separate and apart from said side rail; and

at least one caster assembly integrally attached to the corner brace for allowing the ladder to roll and allowing the side rails of the ladder to contact ground and support a user when the user is on the ladder, said caster assembly and corner brace are disposed on the ladder such that a predetermined weight placed on the ladder prevents the ladder from rolling on the caster assembly, said ladder is comprised of a first side and a second side, said first side having a first rail and a second rail connected by a plurality of steps including a first bottom step, said second side connected to the first side, and having a third rail and a fourth rail connected by a plurality of steps including a second bottom step, said first bottom step having a first end connected to a first corner brace with a first caster assembly and a second end connected to a second corner brace with a second caster assembly, said second bottom step having a first end connected to a third corner brace with a third caster assembly and a second end connected to a fourth corner brace with a fourth caster assembly, each corner brace is comprised of a first portion, a second portion connected to the first portion and a third portion connected to the second portion, said first portion attached to a bottom step of the ladder at the location on the bottom step separate and apart from said rail, said second portion attached to the caster assembly, said third portion attached to a rail of the ladder, each caster assembly is comprised of a caster stem extending in a supported sliding relationship through the second portion, a caster attached to a first end of the caster stem, a spring disposed around the caster stem for biasing the caster stem in an extended position, and a pin connected through the caster stem for compressing the spring as the caster stem slides through the third portion as a result of weight being placed on the ladder, said spring contained by the pin and the second portion.