Patent US2412365A successfully refreshed from Google Patents.
US4209078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable ladder leveling device
Assignee: Individual
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Filing: 1978-07-31
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Granted: 1980-06-24
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Expires: 1998-07-31
Abstract
Abstract A device attachable to the leg of a ladder to lengthen a leg that is too short to reach the uneven level of a supporting surface comprising a sleeve member clamped below the last and next-to-last rung of the ladder; an extension vertically adjustable in the sleeve; a threaded rod having a stop at its lower end abutting the top of the extension and a handle at its upper end for vertically displacing the extension; the lower end of the extension having pivoted thereon a plate with a skid-proof bottom.
Inventors
- 👤 Werner Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:19
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
185 words
An adjustable ladder device attachable to a lower portion of a leg to lengthen said leg so that the ladder may be supported on an inclinded surface, comprising a vertical sleeve, a vertical extension vertically movable in said sleeve and fitted at its lower end with support means, adjusting means extending from said sleeve, which adjusting means engage said extension for regulating the vertical displacement of the lower end of said extension below said sleeve, with said sleeve fitted with a pair of spaced upper and lower securing plates, together with a bracket that is bolted to each said plate such that a section of the lower portion of a ladder leg may be clamped between the plates of said sleeve and each of said brackets, with each bracket formed with a horizontal portion having a groove for receiving a portion of a rung of an attached ladder, together with means to adjust the spacing between said brackets, so that the horizontal portion of each bracket may bear against an individual rung of an attached ladder, when the device is clamped about a ladder leg.
Claim 2
Dependent Claim
185 words
An adjustable ladder device attachable to a lower portion of a leg to lengthen said leg so that the ladder may be supported on an inclinded surface, comprising a vertical sleeve, a vertical extension vertically movable in said sleeve and fitted at its lower end with support means, adjusting means extending from said sleeve, which adjusting means engage said extension for regulating the vertical displacement of the lower end of said extension below said sleeve, with said sleeve fitted with a pair of spaced upper and lower securing plates, together with a bracket that is bolted to each said plate such that a section of the lower portion of a ladder leg may be clamped between the plates of said sleeve and each of said brackets, with each bracket formed with a horizontal portion having a groove for receiving a portion of a rung of an attached ladder, together with means to adjust the spacing between said brackets, so that the horizontal portion of each bracket may bear against an individual rung of an attached ladder, when the device is clamped about a ladder leg.
Claim 3
Dependent Claim
21 words
The combination as recited in claim 1 in which the said adjusting means extends through a top portion of said sleeve.
Claim 4
Dependent Claim
33 words
The invention as recited in claim 2, wherein said adjusting means comprises a threaded rod that is treadably engaged to said sleeve and having an actuating handle means fixed to its upper end.
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) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |