Patent US4787478A successfully refreshed from Google Patents.
US4787478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof ladder attachment
Assignee: Individual
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Filing: 1987-02-25
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Granted: 1988-11-29
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Expires: 2007-02-25
Abstract
Abstract A ladder attachment consisting of 2 pair of bars with holes, connecting rods, locknuts and washers to an extension ladder it forms a frame on the outsides of the ladder that can be adjustably extended over the ridge of a roof. The attachment allows the ladder to conform to the roof's pitch and be secured to the roof's ridge, or to stabilize the ladder against a wall or over the eve of the roof avoiding damage to the gutters.
Inventors
- 👤 John W. Stakes, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:52
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/34; E06C1/345; E06C7/00; E06C7/48; E06C7/488
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A ladder attachment for a ladder having side rails and hollow tubular rungs, said attachment comprising: a pair of separate brackets, each bracket comprising a foot member, a pair of elongated bars, each bar pivotally connected at one end to each other and to said foot member, said bars each having a plurality of holes spaced apart along their longitudinal axis, a pair of bolts longer than the width of said ladder whereby when in operative position each bracket is located adjacent said side rails with some of the holes in each bar in alignment with a pair of said hollow-rungs and interconnected by means of said bolts passing through said hollow rungs and said holes in said bars, and means attached at each end of said bolts for fastening the brackets firmly to the ladder.
Claim 2
Dependent Claim
136 words
A ladder attachment for a ladder having side rails and hollow tubular rungs, said attachment comprising: a pair of separate brackets, each bracket comprising a foot member, a pair of elongated bars, each bar pivotally connected at one end to each other and to said foot member, said bars each having a plurality of holes spaced apart along their longitudinal axis, a pair of bolts longer than the width of said ladder whereby when in operative position each bracket is located adjacent said side rails with some of the holes in each bar in alignment with a pair of said hollow-rungs and interconnected by means of said bolts passing through said hollow rungs and said holes in said bars, and means attached at each end of said bolts for fastening the brackets firmly to the ladder.
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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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |