Patent US4241808A successfully refreshed from Google Patents.
US4241808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable and collapsible A-frame prop type scaffold
Assignee: Individual
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Filing: 1979-08-28
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Granted: 1980-12-30
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Expires: 1999-08-28
Abstract
Abstract A portable and collapsible A-frame prop type scaffold including pairs of spaced apart L-shaped metal angle A-frame supporting legs pivotally connected at their upper points of juncture and having scaffold plank supporting angle brackets pivoted to the upper ends thereof and extendable at right angles thereto, with foldable and interconnectable bars spanning and pivoted to and spreading the legs apart, and locking support angle braces pivoted to the outer ends of the supporting angle brackets and extending angularly downwardly therefrom, with transverse angle bars on the lower ends thereof engageable with the foldable bars. Flat locking straps arranged beneath the locking support angle braces with upwardly and outwardly curved outer ends insertable within slots in the lower ends of the angle braces so as to be pivoted thereto and be extendable rearwardly beneath and in engagement with the abutting foldable bars and transverse angle brackets, with the inner ends of the locking straps being secured to the angle braces by slidable encircling locking rings thereon for readily and securely clamping and locking the angle braces to the foldable bars and legs.
Inventors
- 👤 Donald E. Middleton
- 👤 DeVere J. Audette, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:08
CPC Classifications
B; B25; B25H; B25H1/00; B25H1/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
219 words
In a portable and collapsible A-frame scaffold including at least two A-frame leg units with horizontally disposed scaffold planks extending therebetween and being supported thereby, wherein each of said leg units is formed from L-shaped metal bars pivotally interconnected at their upper ends and diverging downwardly to form A-frame leg units, spanning bracing bars pivoted to said legs intermediate their ends and being removably interconnected, pivotally connected to the upper ends of each leg unit is a horizontally extending elongated plank supporting angle bar bracket, pivotally connected to the outer end of each of said brackets is a downwardly and angularly extending angle bar brace, a transverse angle bar formed on the lower end of each brace is engageable with said spanning leg bracing bars with the lower end of said brace projecting thereover, flat elongated strap means arranged on the underside of said brace at said lower end and being pivoted to the projected lower end of said brace so as to extend under said spanning leg bracing bars and said transverse angle bar, retaining ring means on said brace and engageable with said strap means for securing said strap means against said brace and clamping and locking said leg bracing bars and transverse angle bar together and thereby preventing collapsing of each of said A-frame leg units.
Claim 2
Dependent Claim
219 words
In a portable and collapsible A-frame scaffold including at least two A-frame leg units with horizontally disposed scaffold planks extending therebetween and being supported thereby, wherein each of said leg units is formed from L-shaped metal bars pivotally interconnected at their upper ends and diverging downwardly to form A-frame leg units, spanning bracing bars pivoted to said legs intermediate their ends and being removably interconnected, pivotally connected to the upper ends of each leg unit is a horizontally extending elongated plank supporting angle bar bracket, pivotally connected to the outer end of each of said brackets is a downwardly and angularly extending angle bar brace, a transverse angle bar formed on the lower end of each brace is engageable with said spanning leg bracing bars with the lower end of said brace projecting thereover, flat elongated strap means arranged on the underside of said brace at said lower end and being pivoted to the projected lower end of said brace so as to extend under said spanning leg bracing bars and said transverse angle bar, retaining ring means on said brace and engageable with said strap means for securing said strap means against said brace and clamping and locking said leg bracing bars and transverse angle bar together and thereby preventing collapsing of each of said A-frame leg units.
Claim 3
Dependent Claim
36 words
In a scaffold device according to claim 1, wherein the projected lower end of said angle brace is slotted and the lower end of said strap means projects through said slotted end and is pivoted thereto.
Claim 4
Dependent Claim
27 words
In a scaffold device according to claim 2, wherein the lower end of said strap means is upwardly and downwardly curved and projects through said slotted end.
Claim 5
Dependent Claim
21 words
In a scaffold device according to claim 3, wherein said retaining ring means encircles said angle brace and said strap means.
Claim 6
Dependent Claim
42 words
In a scaffold device according to claim 4, wherein said retaining ring means encircles and is slidably arranged on said angle brace and is movable into encircling engagement with said strap means for clamping the latter to the underside of said brace.
Claim 7
Dependent Claim
44 words
In a scaffold device according to claim 1, wherein two A-frame leg units are arranged in spaced parallel arrangement relative to a wall surface whereby each of the horizontally extending plank supporting brackets engage said wall surface and prop said scaffold leg units thereagainst.
Claim 8
Dependent Claim
62 words
In a scaffold device according to claim 1, wherein two spaced pairs of A-frame units are arranged with each pair being oppositely disposed with the horizontally extending plank supporting brackets in each pair being alined and abutting, and means for removably interconnecting the alined brackets in each pair whereby planks may span the brackets in each pair and provide a self-standing scaffold.
References Cited (Backward Citations)
US1576583A
Cited
US1880909A
Cited
US2272957A
Cited
US2966957A
Cited
US3040834A
Cited
US3098540A
Cited
US3388771A
Cited
US4004652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |