US5131197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounted stairway
Assignee: IMPO Inc 7814 LASSIE LANE LITTLE ROCK AK 72204
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Filing: 1991-02-25
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Granted: 1992-07-21
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Expires: 2011-02-25
Abstract
Abstract The first preferred embodiment of the subject invention is a mounted stairway built on a central single stringer which utilizes stairs horizontally adjustable with regard to inclination of the stringer. The stairs are fixed in the middle by means of splined bolts which fit into splined apertures both of the stringer and tread angles. The railing posts are screwed into bushings of the tread and secured. Brackets screwed on railing post heads have swivels holding the rails in position. The second embodiment is another option of the mounted stairway which utilizes two side stringers for wider stairs. The stairs in this case are fixed from aside by means of two splined bolts to match splined apertures of both stringers and tread angles.
Inventors
- 👤 Joseph S. Varga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:30
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025; E04F11/028; E04F11/0255; E04F11/18; E04F11/181; E04F11/1842
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
228 words
A mounted stairway comprising: a support, consisting of a single stringer having a substantially narrow portion with a row of splined apertures, centrally positioned in longitudial array thereon; a multitude of tread angles each equipped with one splined aperture, wherein said apertures both of the angle and stringer are identical; a multitude of treads each having one or two said angles mounted in the middle of said treads with respect to said stringer, and bushings to accept railing posts; a multitude of fasteners, including splined bolts, washers, nuts and securing pins to mount the angles fixedly to the stringer, wherein the splined grooves of said bolt match the apertures of both stringer and angle; a multitude of railing posts equipped with a flange and threaded end to be screwed into bushings of said treads; a multitude of railing brackets, threaded inside to accept railing posts, equipped with a swivel on pivot for mounting said brackets to rail; a pair of stairfoots, each consisting of an angle with a number of openings in its horizontal portion for being fixed into base and one splined aperture in its vertical portion for accepting said splined bolt; a pair of stairheads, each consisting of an angle with a number of openings in horizontal portion for being fixed into floor and one splined aperture in its vertical portion for accepting said splined bolt.
Claim 2
Dependent Claim
228 words
A mounted stairway comprising: a support, consisting of a single stringer having a substantially narrow portion with a row of splined apertures, centrally positioned in longitudial array thereon; a multitude of tread angles each equipped with one splined aperture, wherein said apertures both of the angle and stringer are identical; a multitude of treads each having one or two said angles mounted in the middle of said treads with respect to said stringer, and bushings to accept railing posts; a multitude of fasteners, including splined bolts, washers, nuts and securing pins to mount the angles fixedly to the stringer, wherein the splined grooves of said bolt match the apertures of both stringer and angle; a multitude of railing posts equipped with a flange and threaded end to be screwed into bushings of said treads; a multitude of railing brackets, threaded inside to accept railing posts, equipped with a swivel on pivot for mounting said brackets to rail; a pair of stairfoots, each consisting of an angle with a number of openings in its horizontal portion for being fixed into base and one splined aperture in its vertical portion for accepting said splined bolt; a pair of stairheads, each consisting of an angle with a number of openings in horizontal portion for being fixed into floor and one splined aperture in its vertical portion for accepting said splined bolt.
Claim 3
Dependent Claim
20 words
A mounted stairway according to claim 1, wherein said support comprises: two stringers, located on both sides of said stairway.
Claim 4
Dependent Claim
35 words
A mounted stairway according to claim 1, wherein said tread comprises: a multitude of treads each having two angles mounted on both sides of a tread with respect to said stringers according to claim 2.
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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) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |