US3834490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step arrangement
Assignee: Individual
•
Filing: 1973-05-31
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Granted: 1974-09-10
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Expires: 1993-05-31
Abstract
Abstract A foldable and retractable heavy duty set of steps is described wherein sheer loading on pivot points is relieved to provide special structural strength for unusual loading conditions.
Inventors
- 👤 R Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:22
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/39; B; B60; B60R; B60R3/00; B60R3/02; E06C5/00; E06C5/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
An improved step arrangement comprising: A. a substantially rectangular housing open on one side to receive a slidably mounted frame therein; B. a substantially rectangular frame adapted to be slidably mounted in said housing; C. a plurality of rectangular step members foldably mounted on said frame; and D. a rectangular riser member pivotally mounted adjacent to the outer end of said frame and foldably attached to said outermost step in a manner so as to lift and support said inner step when the step arrangement is extended for use.
Claim 2
Dependent Claim
89 words
An improved step arrangement comprising: A. a substantially rectangular housing open on one side to receive a slidably mounted frame therein; B. a substantially rectangular frame adapted to be slidably mounted in said housing; C. a plurality of rectangular step members foldably mounted on said frame; and D. a rectangular riser member pivotally mounted adjacent to the outer end of said frame and foldably attached to said outermost step in a manner so as to lift and support said inner step when the step arrangement is extended for use.
Claim 3
Dependent Claim
63 words
An improved step arrangement as described in claim 1 wherein said frame is formed of four elongated angle iron members, three of which are joined to form a U-shaped open frame with vertical sides and the fourth member attached to the free ends in a manner so as to provide a surface 45* to the vertical on the fourth side of said frame.
Claim 4
Dependent Claim
67 words
An improved step arrangement as described in claim 1 wherein said inner step is pivotally mounted by one of its sides adjacent to the inner end of said frame and adapted to fold into the lower portion of said frame while said outer step is similarly pivotally mounted adjacent to the outer end of said frame and adapted to fold into the upper portion of said frame.
Claim 5
Dependent Claim
63 words
An improved step arrangement as described in claim 1 wherein said riser member is pivotally mounted on the same mounting means as said outer step and adapted to fold under said inner step, a folding arrangement pivotably attached to said riser and said outer step provides means for lifting and supporting said inner step when said outer step is liftEd from said frame.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |