US4029174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable legs for ladder
Assignee: Individual
•
Filing: 1976-04-06
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Granted: 1977-06-14
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Expires: 1996-04-06
Abstract
Abstract A ladder designed for standing upon an inclined or other uneven surface; the ladder in one design having a metal block secured to a lower end of each leg, each block having a threaded vertical opening in which a threaded extension is vertically adjustable, a lower end of the extension having plate with a skid-proof bottom.
Inventors
- 👤 James L. Planck
- 👤 George Spector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:54
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
In an improved ladder for standing upon inclined or other terrain, the combination of a pair of spaced apart legs with a plurality of rungs therebetween, a lower end of each leg having a notch, a metal block rigidly affixed in each said notch a threaded vertical opening in each said block, and adjustable extension means screwed in each said threaded opening wherein said extension means comprises a threaded shank supported freely rotatable at its lower end in a horizontal arm of an L-shaped extension that includes a vertical arm slidable alongside said metal block, said vertical arm having a sideward rung rigidly affixed hereto.
Claim 2
Dependent Claim
105 words
In an improved ladder for standing upon inclined or other terrain, the combination of a pair of spaced apart legs with a plurality of rungs therebetween, a lower end of each leg having a notch, a metal block rigidly affixed in each said notch a threaded vertical opening in each said block, and adjustable extension means screwed in each said threaded opening wherein said extension means comprises a threaded shank supported freely rotatable at its lower end in a horizontal arm of an L-shaped extension that includes a vertical arm slidable alongside said metal block, said vertical arm having a sideward rung rigidly affixed hereto.
Claim 3
Dependent Claim
23 words
The combination as set forth in claim 1 wherein said extension rung is one half a length as said rungs of said ladder.
References Cited (Backward Citations)
US332684A
Cited
US2213471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |