US3664458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladder scaffold vehicle
Assignee: KEYLESS LOCK CO Inc
•
Filing: 1971-01-20
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Granted: 1972-05-23
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Expires: 1991-01-20
Abstract
Abstract A vehicle having a ladder and a scaffold which may be extended and retracted by a winch and cable arrangement. A main frame mounted on wheels has a sloping ladder fixedly mounted to its top. The ladder is telescopic, having a middle and top ladder section retractable into a lower ladder section. A first platform is fixedly mounted to the top of the uppermost ladder section. A cage surrounds the platform and is pivotable downward. A second smaller platform is erectable on the first platform. Adjustable jack assemblies and braces fixed to the main frame are engageable to prevent movement of the vehicle. The braces are retracted when not in use.
Inventors
- 👤 Lorance E Sterns
- 👤 Arthur G Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:54
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/397; E06C1/39
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
A ladder scaffold vehicle comprising: a main frame having wheels rotatably mounted thereto; a telescopic ladder mounted atop said frame having a top end and a bottom end, said ladder being slanted from said top end to said bottom end at all times; a first platform fixedly connected to the uppermost portion of said telescopic ladder; telescopic sheet metal channels fixedly mounted to said frame and fixedly attached to said ladder at multiple locations along the length of said ladder, said channels being vertically erect on said frame; cable means operable to extend and retract said telescopic ladder; and, retractable support means operable to stabilize said vehicle.
Claim 2
Dependent Claim
107 words
A ladder scaffold vehicle comprising: a main frame having wheels rotatably mounted thereto; a telescopic ladder mounted atop said frame having a top end and a bottom end, said ladder being slanted from said top end to said bottom end at all times; a first platform fixedly connected to the uppermost portion of said telescopic ladder; telescopic sheet metal channels fixedly mounted to said frame and fixedly attached to said ladder at multiple locations along the length of said ladder, said channels being vertically erect on said frame; cable means operable to extend and retract said telescopic ladder; and, retractable support means operable to stabilize said vehicle.
Claim 3
Dependent Claim
26 words
The vehicle of claim 1 additionally comprising: a second platform erectable and connected to said first platform; and, a cage pivotally mounted atop said first platform.
Claim 4
Dependent Claim
67 words
The vehicle of claim 1 wherein: said cage hAs vertically erect tubes connected together extending above said first platform; and, said second platform is pivotally mounted to said cage and is secureable in a horizontal position and in a vertical position, said second platform in said horizontal position is located above said first platform, said second platform in said vertical position forms a wall between said tubes.
Claim 5
Dependent Claim
94 words
The vehicle of claim 3 wherein: said channels and said ladder each have a lower section, a middle section and a top section; and, said cable means has a first cable-winch arrangement connected to said lower section and said middle section operable to extend and retract said middle section with respect to said lower section, said cable means also has a second cable arrangement connected to said lower section, said middle section and said top section operable to extend and retract said top section with respect to said lower section and said middle section.
Claim 6
Dependent Claim
39 words
The vehicle of claim 4 wherein: said support means has extendable braces pivotally connected to said main frame and foldable against said frame when not in use, said support means has a turnbuckle-rod arrangement operable to lift said vehicle.
Claim 7
Dependent Claim
22 words
The vehicle of claim 5 wherein: said frame, said ladder, said first platform, and said second platform are formed from sheet metal.
Claim 8
Dependent Claim
143 words
A ladder scaffold apparatus comprising: a frame; a lower mast assembly fixedly mounted to said frame and having a first slanted ladder and a first support connected together; a middle mast assembly mounted atop said frame and fitting within said lower mast assembly in the retracted position, said middle mast assembly being extendable from said lower mast assembly and having a second slanted ladder and a second support connected together; a top mast assembly mounted atop said frame and fitting within said middle mast assembly in the retracted position, said top mast assembly being extendable from said middle mast assembly and having a third slanted ladder and a third support connected together; a scaffold mounted atop said top mast assembly; and, means operable to retract and extend said top mast assembly and said middle mast assembly to and from said lower mast assembly.
Claim 9
Dependent Claim
143 words
A ladder scaffold apparatus comprising: a frame; a lower mast assembly fixedly mounted to said frame and having a first slanted ladder and a first support connected together; a middle mast assembly mounted atop said frame and fitting within said lower mast assembly in the retracted position, said middle mast assembly being extendable from said lower mast assembly and having a second slanted ladder and a second support connected together; a top mast assembly mounted atop said frame and fitting within said middle mast assembly in the retracted position, said top mast assembly being extendable from said middle mast assembly and having a third slanted ladder and a third support connected together; a scaffold mounted atop said top mast assembly; and, means operable to retract and extend said top mast assembly and said middle mast assembly to and from said lower mast assembly.
Claim 10
Dependent Claim
44 words
The apparatus of claim 7 additionally comprising: extendable braces pivotally mounted to said frame and having a turnbuckle-rod arrangement operable to lift a portion of said apparatus; and, adjustable jack assemblies connected to said frame and operable to lift a portion of said apparatus.
Claim 11
Dependent Claim
23 words
The apparatus of claim 8 additionally comprising: a cage pivotally mounted to said scaffold assembly; and, a stepping platform mounted to said cage.
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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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |