US4455797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair nosing
Assignee: Naka Technical Laboratory Co Ltd
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Filing: 1981-09-14
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Granted: 1984-06-26
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Expires: 2001-09-14
Abstract
Abstract A stair nosing is constituted by an edge base made of a hard material and adapted to be installed on the tread of a stair step, and an edge bead cushion formed on a surface of the edge base so as to be located at the stair tread nosing of the stair step. A positioning groove is formed on the surface of the edge base behind the edge bead cushion, and a gripper is adapted to be set in the positioning groove and to be secured to the edge base. The edge base is provided with a riser cover integrally formed at the front edge thereof so as to be positioned on the riser of the step in a manner to fit over the stair tread nosing. The gripper is composed of a sheet member adapted to be positioned in the groove and a number of spaced nails projected from the surface of the sheet member.
Inventors
- 👤 Hiromitsu Naka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:35
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/104; E04F11/16; E04F11/163
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
311 words
A stain nosing for covering the tread nosing of a stair step, said stair nosing comprising: an edge base formed of a hard synthetic resin material and adapted to fit on a tread portion of a stair step and to extend longitudinally along a tread nosing thereof; a riser cover formed of said hard synthetic resin material integrally with said edge base and extending downwardly from a forward edge thereof to be positioned over a riser portion of the stair step; a front flange formed of said hard synthetic resin material integrally with said edge base and said riser cover, said front flange extending forwardly from an upper front portion of said riser cover and from said forward edge of said edge base, said front flange having an upper surface inclined downwardly away from the riser portion, and said front flange having formed in an undersurface thereof catching groove means for receiving an upper edge of a piece of carpet adapted to cover the riser portion; an edge bead cushion formed of a soft synthetic resin material or a semi-hard synthetic resin material integrally over a front portion of an upper surface of said edge base and over said inclined surface of said front flange; a positioning groove formed in said upper surface of said edge base at a location rearwardly of said edge bead cushion, said positioning groove extending in the longitudinal direction of the tread nosing of the stair step; and gripper means for securing said edge base to a piece of carpet adapted to cover the tread portion of the stair step, said gripper means comprising a gripper member adapted to fit into said positioning groove and thereby be secured to said edge base, and plural spaced nail-shaped members extending upwardly from said gripper member and adapted to be inserted into a tread portion covering piece of carpet.
Claim 2
Dependent Claim
311 words
A stain nosing for covering the tread nosing of a stair step, said stair nosing comprising: an edge base formed of a hard synthetic resin material and adapted to fit on a tread portion of a stair step and to extend longitudinally along a tread nosing thereof; a riser cover formed of said hard synthetic resin material integrally with said edge base and extending downwardly from a forward edge thereof to be positioned over a riser portion of the stair step; a front flange formed of said hard synthetic resin material integrally with said edge base and said riser cover, said front flange extending forwardly from an upper front portion of said riser cover and from said forward edge of said edge base, said front flange having an upper surface inclined downwardly away from the riser portion, and said front flange having formed in an undersurface thereof catching groove means for receiving an upper edge of a piece of carpet adapted to cover the riser portion; an edge bead cushion formed of a soft synthetic resin material or a semi-hard synthetic resin material integrally over a front portion of an upper surface of said edge base and over said inclined surface of said front flange; a positioning groove formed in said upper surface of said edge base at a location rearwardly of said edge bead cushion, said positioning groove extending in the longitudinal direction of the tread nosing of the stair step; and gripper means for securing said edge base to a piece of carpet adapted to cover the tread portion of the stair step, said gripper means comprising a gripper member adapted to fit into said positioning groove and thereby be secured to said edge base, and plural spaced nail-shaped members extending upwardly from said gripper member and adapted to be inserted into a tread portion covering piece of carpet.
Claim 3
Dependent Claim
62 words
A stair nosing as claimed in claim 1, wherein said edge bead cushion includes an abutting surface at a rear side thereof for abutment with a forward edge of the tread portion covering piece of carpet, and a flexible tread side cover flap extending rearwardly from said abutting surface for covering the forward portion of the tread portion covering piece of carpet.
Claim 4
Dependent Claim
52 words
A stair nosing as claimed in claim 1, wherein said edge bead cushion includes a flexible riser side cover flap extending downwardly from a front portion thereof, said riser side cover flap covering said front flange and being adapted to cover an upper portion of the riser portion covering piece of carpet.
Claim 5
Dependent Claim
64 words
A stair nosing as claimed in claim 1, further comprising a second positioning groove formed in the forward surface of said riser cover at a location below said edge bead cushion, said second positioning groove extending in the longitudinal direction of the tread nosing of the stair step, and gripper means for securing said riser cover to a riser portion covering piece of carpet.
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |