US4100668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a rung assembly for a ladder
Assignee: Shakespeare and Company
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Filing: 1976-07-14
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Granted: 1978-07-18
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Expires: 1996-07-14
Abstract
Abstract The rung assembly is made of two piece construction and of metal while the siderail is made of a reinforced plastics material. The rung assembly includes a rung having a hollow end and a flanged fitting which is secured over the hollow end of the rung by swaging of the hollow end and fitting under a longitudinally applied compressive force. The compression force forms peripheral beads on the rung and fitting which interlock with each other. The rung assembly is secured to the siderail by any suitable fastening means such as rivets, bolts and the like which pass through the flange of the fitting and siderail.
Inventors
- 👤 George Robert Ruff
- 👤 Danny O'Brian Derrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:13
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A method of making a rung assembly for a ladder comprising supporting a rung having a pair of hollow ends throughout the inside of each said end and partially on the outside of each said end; mounting a flanged fitting having an annular collar and a radially directed flange over each said end of said rung; and compressing said ends of said rung longitudinally to swage each respective rung end and said annular collar of a fitting simultaneously to form outwardly directed interlocking peripheral beads thereon located in the unsupported outside of said rung and collar adjacent said ends of said rung.
Claim 2
Independent Claim
102 words
A method of making a rung assembly for a ladder comprising supporting a rung having a pair of hollow ends throughout the inside of each said end and partially on the outside of each said end; mounting a flanged fitting having an annular collar and a radially directed flange over each said end of said rung; and compressing said ends of said rung longitudinally to swage each respective rung end and said annular collar of a fitting simultaneously to form outwardly directed interlocking peripheral beads thereon located in the unsupported outside of said rung and collar adjacent said ends of said rung.
Claim 3
Dependent Claim
53 words
A method as set forth in claim 1 wherein a two-piece mold-like tool is disposed on the outside of said rung to support said rung on the outside, said tool being disposed in abutting relation to an end of said collar of each said fitting during said step of compressing said rung ends.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |