US4593503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable stair guide and support
Assignee: Individual
•
Filing: 1983-05-13
•
Granted: 1986-06-10
•
Expires: 2003-05-13
Abstract
Abstract Several horizontal links have inward-projecting horizontal flanges for supporting the treads of a stairway. Such links are uniformly spaced apart elevationally by upright parallel links pivoted to the horizontal links to form a lazy tongs linkage. One such lazy tongs linkage is permanently attached in inclined attitude to the conventional weight-bearing supports for the stair treads, such as sidewalls or inclined stringers, at each side of the rough opening for the stairway. Prior to permanent installation, the lazy tongs linkage can be extended or contracted by conjoint swinging of the upright links to adjust the spacing of the horizontal tread support flanges so that the total rise of the linkage matches the total rise between adjacent floors as actually constructed. The support is designed to fit a range of expected total rises between the adjacent floors while maintaining a rise and run for each step within acceptable limits.
Inventors
- 👤 Georg Koslowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:11
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025; E04F11/0255
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
In a stairway construction including stair treads and fixed supports for carrying the weight of the opposite end portions, respectively, of the stair treads, the improvement comprising a stair guide and support including several horizontal links including a top horizontal link, said horizontal links being substantially uniformly spaced elevationally and having substantially horizontally extending flanges for supporting corresponding end portions of the stair treads, and several upright substantially parallel links pivoted to said horizontal links to form a lazy tongs linkage in inclined attitude, said horizontal links being immovably secured to the weight-bearing supports in fixed relative relationship and said upright links extending at a substantial acute angle to the vertical.
Claim 2
Dependent Claim
111 words
In a stairway construction including stair treads and fixed supports for carrying the weight of the opposite end portions, respectively, of the stair treads, the improvement comprising a stair guide and support including several horizontal links including a top horizontal link, said horizontal links being substantially uniformly spaced elevationally and having substantially horizontally extending flanges for supporting corresponding end portions of the stair treads, and several upright substantially parallel links pivoted to said horizontal links to form a lazy tongs linkage in inclined attitude, said horizontal links being immovably secured to the weight-bearing supports in fixed relative relationship and said upright links extending at a substantial acute angle to the vertical.
Claim 3
Dependent Claim
31 words
The stairway construction defined in claim 1, in which the upright links are inclined downward and outward relative to the top horizontal link at a substantial acute angle to the vertical.
Claim 4
Dependent Claim
18 words
The stairway construction defined in claim 2, in which the substantial acute angle is at least 10 degrees.
Claim 5
Independent Claim
118 words
The method of constructing a permanent stairway between adjacent upper and lower floors of a multistory building structure which comprises changing the degree of inclination from vertical of the upright links of a lazy tongs linkage having several horizontal links substantially uniformly spaced elevationally and thereby simultaneously altering the elevational spacing between the horizontal links so that the total rise of the horizontal links with the upright links in inclined attitude matches the vertical distance between such adjacent floors, immovably securing the linkage to fixed weight-bearing supports to maintain the horizontal and upright links in fixed relative positions, and installing stair treads with corresponding end portions thereof resting on tread support flanges projecting inward from the horizontal links.
Claim 6
Independent Claim
118 words
The method of constructing a permanent stairway between adjacent upper and lower floors of a multistory building structure which comprises changing the degree of inclination from vertical of the upright links of a lazy tongs linkage having several horizontal links substantially uniformly spaced elevationally and thereby simultaneously altering the elevational spacing between the horizontal links so that the total rise of the horizontal links with the upright links in inclined attitude matches the vertical distance between such adjacent floors, immovably securing the linkage to fixed weight-bearing supports to maintain the horizontal and upright links in fixed relative positions, and installing stair treads with corresponding end portions thereof resting on tread support flanges projecting inward from the horizontal links.
References Cited (Backward Citations)
US1128212A
Cited
US2245825A
Cited
US2575615A
Cited
GB810303A
Cited
US2879556A
Cited
US3626438A
Cited
US3885365A
Cited
US3962838A
Cited
US4124957A
Cited
US4020920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |