US3713511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable stair assembly
Assignee: Individual
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Filing: 1971-06-14
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Granted: 1973-01-30
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Expires: 1991-06-14
Abstract
Abstract An adjustable stair assembly in which the stair treads are adjustably supported on stringers so that the exposed tread surface may be selectively determined in proportion to the riser dimension from tread to tread, and the stringers are telescoped into upper and lower supports which anchor the assembly in the desired final position. In the assembly the stringers are used in pairs at each end of the treads and in conjunction with the upper and lower telescoping supports are selectively spaced to obtain the desired riser dimension and exposed tread width within acceptable standards of riser to tread dimensional ratios.
Inventors
- 👤 L Hinkle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:12
CPC Classifications
E; E06; E06C; E06C9/00; E06C9/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
An adjustable stair assembly to provide access between upper and lower levels comprising a pair of stringer members for each side of said stair assembly, upper level support means for the upper ends of said pairs of stringers, first means interconnecting said upper level support means and the adjacent ends of each pair of said stringers, lower level support means for the lower ends of said pairs of stringers, second means interconnecting said lower level support means and the adjacent ends of said pair of said stringers, said pairs of stringers being adjustable relative to each other in each pair and to at least one of said first and second means to accommodate a desired pitch angle for said stair assembly, said at least one of said first and second means including bolt means, said bolt means on being tightened holding said stringers at the desired pitch angle, and stair treads spanning said pair of stringers.
Claim 2
Dependent Claim
156 words
An adjustable stair assembly to provide access between upper and lower levels comprising a pair of stringer members for each side of said stair assembly, upper level support means for the upper ends of said pairs of stringers, first means interconnecting said upper level support means and the adjacent ends of each pair of said stringers, lower level support means for the lower ends of said pairs of stringers, second means interconnecting said lower level support means and the adjacent ends of said pair of said stringers, said pairs of stringers being adjustable relative to each other in each pair and to at least one of said first and second means to accommodate a desired pitch angle for said stair assembly, said at least one of said first and second means including bolt means, said bolt means on being tightened holding said stringers at the desired pitch angle, and stair treads spanning said pair of stringers.
Claim 3
Dependent Claim
156 words
An adjustable stair assembly to provide access between upper and lower levels comprising a pair of stringer members for each side of said stair assembly, upper level support means for the upper ends of said pairs of stringers, first means interconnecting said upper level support means and the adjacent ends of each pair of said stringers, lower level support means for the lower ends of said pairs of stringers, second means interconnecting said lower level support means and the adjacent ends of said pair of said stringers, said pairs of stringers being adjustable relative to each other in each pair and to at least one of said first and second means to accommodate a desired pitch angle for said stair assembly, said at least one of said first and second means including bolt means, said bolt means on being tightened holding said stringers at the desired pitch angle, and stair treads spanning said pair of stringers.
Claim 4
Dependent Claim
156 words
An adjustable stair assembly to provide access between upper and lower levels comprising a pair of stringer members for each side of said stair assembly, upper level support means for the upper ends of said pairs of stringers, first means interconnecting said upper level support means and the adjacent ends of each pair of said stringers, lower level support means for the lower ends of said pairs of stringers, second means interconnecting said lower level support means and the adjacent ends of said pair of said stringers, said pairs of stringers being adjustable relative to each other in each pair and to at least one of said first and second means to accommodate a desired pitch angle for said stair assembly, said at least one of said first and second means including bolt means, said bolt means on being tightened holding said stringers at the desired pitch angle, and stair treads spanning said pair of stringers.
Claim 5
Dependent Claim
38 words
The stair assembly of claim 1 wherein said stringers are tubular members, and said second means telescopically fit into the adjacent ends of said tubular stringer members for sliding adjustment to said desired pitch angle for the assembly.
Claim 6
Dependent Claim
26 words
The stair assembly of claim 2 wherein set screws secure said tubular members to said second means whereby the tubular members are secured against longitudinal displacement.
Claim 7
Dependent Claim
35 words
The stair assembly of claim 1 wherein the upper level support means is a porch deck extending horizontally from said first members, and leg means engaged and support said porch deck in horizontal set position.
Claim 8
Dependent Claim
71 words
The stair assembly of claim 4 wherein said first and second means slidingly engage the respective adjacent ends of said stringer members and said first means pivotally engage said deck, whereby said deck is foldable about one of said stringer members at each side and causes the remaining one of said stringer member to fold into adjacency with said one stringer member, whereby said stair assembly is foldable into collapsed position.
Claim 9
Dependent Claim
119 words
An adjustable stair assembly between upper and lower levels comprising two pairs of stringer members, one pair at each side of the stair assembly, first support means slidably engaged with the upper ends of said pairs of stringer members and pivotally connected to the upper level, second support means slidably engaged with the lower ends of said pairs of stringer members and pivotally connected to the lower level, bracket means pivotally connected to and spanning the stringer members of each pair thereof, treads supported on said bracket means and extending generally horizontally between said pairs of stringer members to form the supporting stair surfaces, bolt means constituting the pivotal connections for tightening to retain the stair assembly in position.
Claim 10
Dependent Claim
119 words
An adjustable stair assembly between upper and lower levels comprising two pairs of stringer members, one pair at each side of the stair assembly, first support means slidably engaged with the upper ends of said pairs of stringer members and pivotally connected to the upper level, second support means slidably engaged with the lower ends of said pairs of stringer members and pivotally connected to the lower level, bracket means pivotally connected to and spanning the stringer members of each pair thereof, treads supported on said bracket means and extending generally horizontally between said pairs of stringer members to form the supporting stair surfaces, bolt means constituting the pivotal connections for tightening to retain the stair assembly in position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |