Patent US4522466A successfully refreshed from Google Patents.
US3878918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable ladder
Assignee: Individual
•
Filing: 1973-08-13
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Granted: 1975-04-22
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Expires: 1993-08-13
Abstract
Abstract A ladder having adjustable extensions secured to the lower ends of the ladder legs so that the ladder can seat upon an inclined surface or steps on different elevations; each extension having a row of openings slong its length, a selective one of the openings being engaged by a transverse bolt extending through the ladder leg.
Inventors
- 👤 Anthony G Basile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
219 words
A ladder having lower spaced legs mounted adjustably on the lower end of said ladder for longitudinal movement relative to each other and said ladder whereby said legs can be positioned at different longitudinal positions relative to the lower end of said ladder, in combination with a rotary gear rotatably mounted at the lower end of the ladder between said legs, including teeth extending from each leg to engage said gear whereby rotation of said gear causes relative longitudinal motion of the legs, including means for selectively locking the gear to the ladder thereby preventing rotary motion and movement of the legs when positioned at desired locations wherein the lower end of the ladder includes parallel rails and said legs are mounted on rails members for parallel relative extending motion thereto, including a fixed panel transversely connected to said rails, said gear having a shaft rotatable mounted transversely on said panel, said gear being spaced from and parallel to said panel, said shaft being mounted axially slidable relative to both panel and gear, said means comprising coacting portions on said shaft and panel which interlock when the said shaft is slid axially to predetermined first position and wherein said portions are free of each other when the shaft is moved to a second position permitting rotation of the gear.
Claim 2
Dependent Claim
219 words
A ladder having lower spaced legs mounted adjustably on the lower end of said ladder for longitudinal movement relative to each other and said ladder whereby said legs can be positioned at different longitudinal positions relative to the lower end of said ladder, in combination with a rotary gear rotatably mounted at the lower end of the ladder between said legs, including teeth extending from each leg to engage said gear whereby rotation of said gear causes relative longitudinal motion of the legs, including means for selectively locking the gear to the ladder thereby preventing rotary motion and movement of the legs when positioned at desired locations wherein the lower end of the ladder includes parallel rails and said legs are mounted on rails members for parallel relative extending motion thereto, including a fixed panel transversely connected to said rails, said gear having a shaft rotatable mounted transversely on said panel, said gear being spaced from and parallel to said panel, said shaft being mounted axially slidable relative to both panel and gear, said means comprising coacting portions on said shaft and panel which interlock when the said shaft is slid axially to predetermined first position and wherein said portions are free of each other when the shaft is moved to a second position permitting rotation of the gear.
Claim 3
Dependent Claim
219 words
A ladder having lower spaced legs mounted adjustably on the lower end of said ladder for longitudinal movement relative to each other and said ladder whereby said legs can be positioned at different longitudinal positions relative to the lower end of said ladder, in combination with a rotary gear rotatably mounted at the lower end of the ladder between said legs, including teeth extending from each leg to engage said gear whereby rotation of said gear causes relative longitudinal motion of the legs, including means for selectively locking the gear to the ladder thereby preventing rotary motion and movement of the legs when positioned at desired locations wherein the lower end of the ladder includes parallel rails and said legs are mounted on rails members for parallel relative extending motion thereto, including a fixed panel transversely connected to said rails, said gear having a shaft rotatable mounted transversely on said panel, said gear being spaced from and parallel to said panel, said shaft being mounted axially slidable relative to both panel and gear, said means comprising coacting portions on said shaft and panel which interlock when the said shaft is slid axially to predetermined first position and wherein said portions are free of each other when the shaft is moved to a second position permitting rotation of the gear.
Claim 4
Dependent Claim
219 words
A ladder having lower spaced legs mounted adjustably on the lower end of said ladder for longitudinal movement relative to each other and said ladder whereby said legs can be positioned at different longitudinal positions relative to the lower end of said ladder, in combination with a rotary gear rotatably mounted at the lower end of the ladder between said legs, including teeth extending from each leg to engage said gear whereby rotation of said gear causes relative longitudinal motion of the legs, including means for selectively locking the gear to the ladder thereby preventing rotary motion and movement of the legs when positioned at desired locations wherein the lower end of the ladder includes parallel rails and said legs are mounted on rails members for parallel relative extending motion thereto, including a fixed panel transversely connected to said rails, said gear having a shaft rotatable mounted transversely on said panel, said gear being spaced from and parallel to said panel, said shaft being mounted axially slidable relative to both panel and gear, said means comprising coacting portions on said shaft and panel which interlock when the said shaft is slid axially to predetermined first position and wherein said portions are free of each other when the shaft is moved to a second position permitting rotation of the gear.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |