US4899849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder stabilizer
Assignee: AC INNOVATIONS Inc A CORP OF
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Filing: 1988-12-05
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Granted: 1990-02-13
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Expires: 2008-12-05
Abstract
Abstract Stabilizer apparatus for attachment to an extension ladder for inhibiting sideways tipping and downward/rearward slipping thereof. Attached to the opposed side rails of the ladder proximate the upper end of the lowermost section are hinge blocks for pivotally joining a pair of tubular, telescoping, extensible legs to the ladder. The hinge brackets are specially designed to permit the tubular legs to be swung parallel to and directly adjacent with the ladder's side rails when the ladder is to be stowed and which the legs to be rotated laterally outward and forward of the base of the ladder during use. An articulated brace extends between the pair of legs and their associated ladder side rails to limit the extent to which the legs may be splayed relative to the ladder.
Inventors
- 👤 Avraham Y. Levi
- 👤 Craig D. Quarberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:30
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/14; E06C1/16; E06C1/20; E06C1/22; E06C7/00; E06C7/42; E06C7/423; F; F16; F16B; F16B7/00; F16B7/10; F16B7/14; F16B7/1427
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
Stabilizer apparatus for supporting a two-legged ladder against lateral and rearward movement, comprising in combination: (a) first and second hinge blocks attachable to the outer side surfaces of the side rails of a two-legged ladder proximate the upper ends thereof, each of said hinge blocks including a planar plate surface for abutting said outer side surfaces of said side rails and with an integrally formed, generally U-shaped channel projecting outwardly from said plate surface at a predetermined acute angle, there being aligned apertures formed centrally through the opposed sides of said U-shaped channel; (b) first and second elongated, telescopingly extendible, tubular pole members individually connected at one end thereof to said first and second hinge blocks, respectively, by hinge pins passing transversely through said pole members and said aligned apertures; and (c) a folding brace member attached to said tubular pole members at a location immediate said one and other ends of said tubular pole members and to said side rails of said ladder for limiting the extent to which said first and second pole members can be spread relative to said side rails of the ladder to which said pole members are hinged.
Claim 2
Dependent Claim
194 words
Stabilizer apparatus for supporting a two-legged ladder against lateral and rearward movement, comprising in combination: (a) first and second hinge blocks attachable to the outer side surfaces of the side rails of a two-legged ladder proximate the upper ends thereof, each of said hinge blocks including a planar plate surface for abutting said outer side surfaces of said side rails and with an integrally formed, generally U-shaped channel projecting outwardly from said plate surface at a predetermined acute angle, there being aligned apertures formed centrally through the opposed sides of said U-shaped channel; (b) first and second elongated, telescopingly extendible, tubular pole members individually connected at one end thereof to said first and second hinge blocks, respectively, by hinge pins passing transversely through said pole members and said aligned apertures; and (c) a folding brace member attached to said tubular pole members at a location immediate said one and other ends of said tubular pole members and to said side rails of said ladder for limiting the extent to which said first and second pole members can be spread relative to said side rails of the ladder to which said pole members are hinged.
Claim 3
Dependent Claim
47 words
The stabilizer apparatus as in claim 1 wherein said first and second tubular members each include at least two segments joined in telescoping relation and means for releasibly locking said two segments together upon rotation of one segment relative to the other segment by a predetermined amount.
Claim 4
Dependent Claim
34 words
The stabilizer apparatus as in claim 1 and further including first and second footpad members being coupled by a swivel connection to the other end of said first and second tubular pole members, respectively.
Claim 5
Dependent Claim
77 words
The stabilizer as in claim 1 wherein said folding brace member includes: (a) a pair of straight bar segments pivotally joined to one another; (b) a clamp for surrounding one of said tubular pole members and having an integrally formed projection hingedly connected to one end of one of said straight bar segments; and (c) a clevis member attachable to a side rail of said ladder to one end of the other of said straight bar segments.
Claim 6
Dependent Claim
129 words
A ladder assembly comprising: (a) a pair of longitudinally extending rails held together in parallel, spaced-apart relation by a plurality of parallel, transversely extending, spaced-apart rung; (b) a pair of hinge brackets secured to said rails, each including a U-shaped leg receiving channel oriented at a predetermined acute angle with respect to said rail; (c) a pair of elongated, multi-segment, telescopingly-extendable and retractable legs having one end of each pivotally secured in a respective one of said leg-receiving channels of said pair of brackets whereby said legs can be selectively collapsed against said rails for storage or extended laterally outward and forward of said rails at said predetermined angle to support said rails in a desired inclined vertical disposition resistent to lateral rotational movement of said rails during use.
Claim 7
Dependent Claim
129 words
A ladder assembly comprising: (a) a pair of longitudinally extending rails held together in parallel, spaced-apart relation by a plurality of parallel, transversely extending, spaced-apart rung; (b) a pair of hinge brackets secured to said rails, each including a U-shaped leg receiving channel oriented at a predetermined acute angle with respect to said rail; (c) a pair of elongated, multi-segment, telescopingly-extendable and retractable legs having one end of each pivotally secured in a respective one of said leg-receiving channels of said pair of brackets whereby said legs can be selectively collapsed against said rails for storage or extended laterally outward and forward of said rails at said predetermined angle to support said rails in a desired inclined vertical disposition resistent to lateral rotational movement of said rails during use.
Claim 8
Dependent Claim
23 words
The ladder assembly as in claim 5 and further including footpad means swivel mounted to the lower ends of said pair of legs.
Claim 9
Dependent Claim
36 words
The ladder assembly as in claim 5 and further including a locking cam operatively coupled between segments of said multi-segment telescopingly-extendable and retractable legs for selectively locking adjacent segments against longitudinal movement relative to one another.
Claim 10
Dependent Claim
34 words
The ladder as in claim 5 and further including folding brace means coupled between said rails and said legs to limit the extent to which said legs can be spread relative to said rails.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |