Patent US4085820A successfully refreshed from Google Patents.
US4085820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder leveler
Assignee: Individual
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Filing: 1977-07-05
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Granted: 1978-04-25
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Expires: 1997-07-05
Abstract
Abstract A leveling device for ladders, consisting of a spring loaded latch mechanism, which includes arms having oppositely opposed ends, which will normally engage an outer and inner rail at different slot positions, so as to level a ladder. The arms of the latch mechanism include a portion which is finger depressible, so as to disengage the oppositely opposed arms from the various slot positions.
Inventors
- 👤 Louis F. Cerny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:25
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/42; E06C7/44
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
184 words
A ladder leveler, comprising in combination, a latch mechanism, an inner rail and an outer rail, said rails each being of U-shaped transverse configuration, said inner rail being slidably fitted inside said outer rail, a plurality of equally spaced apart slots along opposite side walls of each said rail, a longitudinal edges of said outer rail being rolled around longitudinal edges of said inner rail; said mechanism comprising a pair of L-shaped arms, an inside corner of each said arm being around a side of a pivot-pin, a short leg of each said arm extending generally in opposite directions, while a long leg of said arms extend generally parallel to each other, a U-shaped member being affixed to an end of said long leg of each said arm, a compression coil spring between said members, whereby squeezing said members together cause the ends of said arm short legs to pivot about said pivot pin so to shorten a distance between said short arm ends, and thus be released from said outer rail slots and allow slide adjustment of said rails respective to each other.
Claim 2
Dependent Claim
184 words
A ladder leveler, comprising in combination, a latch mechanism, an inner rail and an outer rail, said rails each being of U-shaped transverse configuration, said inner rail being slidably fitted inside said outer rail, a plurality of equally spaced apart slots along opposite side walls of each said rail, a longitudinal edges of said outer rail being rolled around longitudinal edges of said inner rail; said mechanism comprising a pair of L-shaped arms, an inside corner of each said arm being around a side of a pivot-pin, a short leg of each said arm extending generally in opposite directions, while a long leg of said arms extend generally parallel to each other, a U-shaped member being affixed to an end of said long leg of each said arm, a compression coil spring between said members, whereby squeezing said members together cause the ends of said arm short legs to pivot about said pivot pin so to shorten a distance between said short arm ends, and thus be released from said outer rail slots and allow slide adjustment of said rails respective to each other.
Claim 3
Dependent Claim
44 words
The combination as set forth in claim 1, wherein each of said U-shaped member bridges across one said longitudinal edge of both said rails, an oute end of said U-shaped members being thus positioned for receiving a manual pressure for squeezing said spring therebetween.
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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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |