Patent US4311207A successfully refreshed from Google Patents.
US4311207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder attachment
Assignee: Individual
•
Filing: 1980-03-13
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Granted: 1982-01-19
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Expires: 2000-03-13
Abstract
Abstract A ladder attachment including an adjustable frame assembly detachably connected to the end of a section of a conventional extension ladder, the frame assembly cooperating with the side rails of the ladder to form a hook portion for extending over the ridge of a pitched roof to thereby allow the ladder to be supported in an inclined position on the roof.
Inventors
- 👤 Percell C. Lurry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:05
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/34; E06C1/345; E06C1/36; E06C7/00; E06C7/48; E06C7/488
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
266 words
A ladder attachment comprising a rigid rectangular frame having a pair of spaced, parallel side frame members and a pair of transversely extending end frame members connected to said side frame members at the ends thereof, a first bolt assembly extending transversely through the side frame members substantially intermediate the ends thereof and through the side rails of a ladder at one end thereof, whereby the rectangular frame is freely pivoted to the end of the ladder, a pair of links, a second bolt assembly extending transversely through one end of each link and the side rails of the ladder to thereby pivotally connect the links to said ladder side rails, a plurality of longitudinally spaced apertures provided in each of said links, an aperture provided in each of said side frame members of said rectangular frame adapted to be aligned with a respective selected aperture in said links, a third bolt assembly insertable through a selected aperture in the links and through an aligned aperture in the side frame members of said rectangular frame to thereby hold the frame member at an angular position relative to the ladder, said angular position being changeable by merely removing said third bolt assembly from a selected aperture in said links and inserting said third bolt assembly through another selected aperture in said links and through said aligned apertures in said side frame members, whereby the rectangular frame cooperates with the ladder to form a hook portion adapted to extend over the ridge of a pitched roof while the ladder is supported at an inclined position on the roof.
Claim 2
Dependent Claim
266 words
A ladder attachment comprising a rigid rectangular frame having a pair of spaced, parallel side frame members and a pair of transversely extending end frame members connected to said side frame members at the ends thereof, a first bolt assembly extending transversely through the side frame members substantially intermediate the ends thereof and through the side rails of a ladder at one end thereof, whereby the rectangular frame is freely pivoted to the end of the ladder, a pair of links, a second bolt assembly extending transversely through one end of each link and the side rails of the ladder to thereby pivotally connect the links to said ladder side rails, a plurality of longitudinally spaced apertures provided in each of said links, an aperture provided in each of said side frame members of said rectangular frame adapted to be aligned with a respective selected aperture in said links, a third bolt assembly insertable through a selected aperture in the links and through an aligned aperture in the side frame members of said rectangular frame to thereby hold the frame member at an angular position relative to the ladder, said angular position being changeable by merely removing said third bolt assembly from a selected aperture in said links and inserting said third bolt assembly through another selected aperture in said links and through said aligned apertures in said side frame members, whereby the rectangular frame cooperates with the ladder to form a hook portion adapted to extend over the ridge of a pitched roof while the ladder is supported at an inclined position on the roof.
Claim 3
Dependent Claim
29 words
A ladder attachment according to claim 1, wherein roller means are connected to the side frame members to facilitate rolling the ladder and associated attachment on a roof surface.
Claim 4
Dependent Claim
37 words
A ladder attachment according to claim 1, wherein the ladder comprises a section of a conventional extension ladder having tubular rungs, said first bolt assembly extending through the tubular rung at one end of the ladder section.
Claim 5
Dependent Claim
28 words
A ladder attachment according to claim 3, wherein said second bolt assembly extends through one end of each link and the next adjacent rung to said end rung.
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) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |