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US3933222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder leveler
Assignee: Individual
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Filing: 1974-09-25
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Granted: 1976-01-20
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Expires: 1994-09-25
Abstract
Abstract A ladder having an adjustable extension enabling it to be positioned stably on uneven ground. The extension is telescopingly mounted on the outside of one leg of the ladder, and is slidable relative to the ladder leg in the longitudinal direction. Its range of movement is not limited by the ladder rungs. Locking means are selectively engageable in a series of holes to hold the extension in desired position.
Inventors
- 👤 Coba C. Craig, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:48
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32467; Y10T403/32475; Y10T403/32483
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
234 words
A ladder leveler comprising, a ladder having a pair of parallel legs spaced apart by rungs which interconnect them, each of the said legs being channel shaped with spaced flanges projecting parallel to the rungs, at least one leg of the ladder having an adjustable extension mounted to it for extending the effective length of said leg to enable said ladder to rest stably on uneven ground, said extension being in the form of a channel having a back wall and spaced side walls extending from the back wall, said side walls projecting parallel to the said flanges of said one leg, said extension also including inturned retainer lips extending from the side walls and projecting reversely toward said back wall, the said one leg being slidably embraced within the channel and the respective flanges thereof retained between said retainer lips and the adjacent side walls, said extension permitting only longitudinally sliding movement of the leg with respect to it, and a lock for locking the longitudinal position of the extension of the leg, said lock being mounted to one of the extension and the leg, the other of the extension and the leg having a series of longitudinally spaced holes, said lock including a finger projecting through said one of said extension and leg and selectively engageable in the respective holes of said series to prevent movement of the extension on the leg.
Claim 2
Dependent Claim
234 words
A ladder leveler comprising, a ladder having a pair of parallel legs spaced apart by rungs which interconnect them, each of the said legs being channel shaped with spaced flanges projecting parallel to the rungs, at least one leg of the ladder having an adjustable extension mounted to it for extending the effective length of said leg to enable said ladder to rest stably on uneven ground, said extension being in the form of a channel having a back wall and spaced side walls extending from the back wall, said side walls projecting parallel to the said flanges of said one leg, said extension also including inturned retainer lips extending from the side walls and projecting reversely toward said back wall, the said one leg being slidably embraced within the channel and the respective flanges thereof retained between said retainer lips and the adjacent side walls, said extension permitting only longitudinally sliding movement of the leg with respect to it, and a lock for locking the longitudinal position of the extension of the leg, said lock being mounted to one of the extension and the leg, the other of the extension and the leg having a series of longitudinally spaced holes, said lock including a finger projecting through said one of said extension and leg and selectively engageable in the respective holes of said series to prevent movement of the extension on the leg.
Claim 3
Dependent Claim
98 words
The ladder leveler of claim 1 wherein said lock is mounted to one of the walls of said channel for pivotal movement about an axis parallel to but offset from the surface of said one wall, said finger being movable through an opening in such wall, and further wherein said finger does not project through said opening at a right angle but rather extends downwardly through it at an acute angle, such downward angulation thereby causing said finger to be cammed further through said opening in said wall when a downward load acts on said leg in use.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |