Patent US4570751A successfully refreshed from Google Patents.
US4570751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable platform scaffolding
Assignee: Individual
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Filing: 1985-03-07
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Granted: 1986-02-18
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Expires: 2005-03-07
Abstract
Abstract An adjustable-height scaffolding comprises a plurality of telescoping variable height adjustable supports each having an outer pipe and an inner pipe slidably mounted inside the outer pipe of the supports and two scaffolding platforms pivotally attached to the top portion of the telescoping supports with horizontal pivot axes. The scaffolding is structured so that each of the scaffolding platforms has an upright resting position for storage, transport, and the like and a collapsible horizontal working position. Four of the telescoping supports are provided as central supports for the scaffolding. The central supports form the corner posts for a substantially rectangular frame supporting the scaffolding platforms. Two of the telescoping central supports are pivotally attached to each one of the scaffolding platforms adjacent the other one of the scaffolding platforms. The top portion of the inner pipes of the corner posts are attached pivotally to the scaffolding platforms. The pair of corner posts associated with each of the scaffolding platforms is independent of the other pair of corner posts so that the heights of each platform are independently adjustable.
Inventors
- 👤 Gerhard Kleu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:00
CPC Classifications
E; E04; E04H; E04H3/00; E04H3/10; E04H3/22; E04H3/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
In an adjustable scaffolding comprising a plurality of telescoping variable-height adjustable supports each having an outer pipe and an inner pipe slidably mounted inside said outer pipe and two scaffolding platforms pivotally attached to said telescoping supports with a horizontal pivot axis, each of said scaffolding platforms being swingable between an upright rest position and a horizontal working position, the improvement wherein four of said telescoping supports are provided as central supports for said scaffolding, said central supports forming corner posts for a central substantially rectangular frame supporting said scaffolding platforms, and two of said telescoping central supports are pivotally attached to each of said scaffolding platforms adjacent the other one of said scaffolding platforms, the top portions of said inner pipes of said corner posts being attached pivotally to said scaffolding platforms so that the height of each of said platforms can be independently adjusted.
Claim 2
Dependent Claim
146 words
In an adjustable scaffolding comprising a plurality of telescoping variable-height adjustable supports each having an outer pipe and an inner pipe slidably mounted inside said outer pipe and two scaffolding platforms pivotally attached to said telescoping supports with a horizontal pivot axis, each of said scaffolding platforms being swingable between an upright rest position and a horizontal working position, the improvement wherein four of said telescoping supports are provided as central supports for said scaffolding, said central supports forming corner posts for a central substantially rectangular frame supporting said scaffolding platforms, and two of said telescoping central supports are pivotally attached to each of said scaffolding platforms adjacent the other one of said scaffolding platforms, the top portions of said inner pipes of said corner posts being attached pivotally to said scaffolding platforms so that the height of each of said platforms can be independently adjusted.
Claim 3
Dependent Claim
49 words
The improvement defined in claim 1 wherein said corner posts associated with said scaffolding platforms may be jointly raised and lowered together, said corner posts associated with one of said scaffolding platforms being raisable and lowerable independently of said corner posts of said other one of said scaffolding platforms.
Claim 4
Dependent Claim
41 words
The improvement defined in claim 1 wherein each of said inner pipes of said corner posts is supported from below by a compressible insert providing a force directed to respond to up and down motions of each of said inner pipes.
Claim 5
Dependent Claim
41 words
The improvement defined in claim 3 wherein said compressible insert is a coil spring substantially balancing the entire weight of said inner tubes and the associated scaffolding platforms and outer supports, said coil spring supporting the underside of said inner pipes.
Claim 6
Dependent Claim
60 words
The improvement defined in claim 1, further comprising telescoping outer supports pivotally connected to each platform and each constructed as a slanted support inclined to the outside of said scaffolding, each of said outer supports being foldable to the underside of said associated scaffolding platforms and pivotable about an outer support pivot on an underside of a respective scaffolding platform.
Claim 7
Dependent Claim
54 words
The improvement defined in claim 5 wherein each of said slanted outer supports is lockable selectively in two attachment positions on each of said scaffolding platforms, said attachment positions comprising a resting position and a working position and each of said outer supports is additionally connected to the respective platform by a guide rod.
Claim 8
Dependent Claim
56 words
The improvement defined in claim 6 wherein in said working position each of said slanted outer supports is locked into a respective scaffolding platform between the places of attachment of a respective guide rod and corner post, said guide rods being pivotally attached to the respective platform with clearance from upper ends of said slanted supports.
Claim 9
Dependent Claim
24 words
The improvement defined in claim 1 wherein each pair of said outer supports associated with each scaffolding platform are interconnected by a rigid frame.
Claim 10
Dependent Claim
21 words
The improvement defined in claim 8 wherein inner tubes of each pair of said outer supports are attached to each other.
Claim 11
Dependent Claim
21 words
The improvement defined in claim 8 wherein outer tubes of each pair of said outer supports are attached to each other.
References Cited (Backward Citations)
US2978754A
Cited
US3312305A
Cited
US3318269A
Cited
US4089522A
Cited
US3999491A
Cited
US4074636A
Cited
US4054096A
Cited
US4327650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |