US4486987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stair nosing
Assignee: Naka Technical Laboratory Co Ltd
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Filing: 1982-12-16
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Granted: 1984-12-11
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Expires: 2002-12-16
Abstract
Abstract A stair nosing is constituted by a flat frame for lying on a tread of a stair, a non-skid flat tire-like sheet adapted to be snappedly engaged to the flat frame and a tongue-shaped protector for the engaging portion of the flat sheet frame and the non-skid flat sheet. The non-skid flat sheet includes a connecting plate of rigid synthetic resin having a flange with a rib at one edge and a non-skid flat tread of flexible synthetic resin integrally formed on the upper surface of the connecting plate. The tongue-shaped protector is integrally formed with the non-skid flat tread so as to cover the engaging portion of the frame sheet and be spaced from a riser of the stair when the non-skid flat sheet is secured to the flat sheet frame.
Inventors
- 👤 Hiromitsu Naka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:14
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/104; E04F11/16; E04F11/163; E04F11/166
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
182 words
A stair nosing, comprising: a flat metal frame for being secured to the tread of a stair, said frame including a flat upper portion having a frame front edge and a frame rear edge, a hook extending downward from said frame front edge for engaging the riser of the stair, and an inturned bead integrally formed at said frame rear edge; a non-skid sheet including a rigid synthetic resin connecting plate for being secured to and over said frame, said plate having a sheet rear edge or insertion into said inturned bead, and a sheet front edge, a flange extending downwardly from said sheet front edge and having a flange rib snappedly engagable into said hook, and a non-skid tread having a tread front edge, formed of flexible synthetic resin, fixed on the upper surface of said connecting plate; and a tongue-shaped protector formed of flexible synthetic resin, integrally formed with said tread at said tread front edge so as to cover the engaging portions of said hook and said flange rib when said flange rib is snappedly engaged into said hook.
Claim 2
Dependent Claim
182 words
A stair nosing, comprising: a flat metal frame for being secured to the tread of a stair, said frame including a flat upper portion having a frame front edge and a frame rear edge, a hook extending downward from said frame front edge for engaging the riser of the stair, and an inturned bead integrally formed at said frame rear edge; a non-skid sheet including a rigid synthetic resin connecting plate for being secured to and over said frame, said plate having a sheet rear edge or insertion into said inturned bead, and a sheet front edge, a flange extending downwardly from said sheet front edge and having a flange rib snappedly engagable into said hook, and a non-skid tread having a tread front edge, formed of flexible synthetic resin, fixed on the upper surface of said connecting plate; and a tongue-shaped protector formed of flexible synthetic resin, integrally formed with said tread at said tread front edge so as to cover the engaging portions of said hook and said flange rib when said flange rib is snappedly engaged into said hook.
Claim 3
Dependent Claim
55 words
A stair nosing as in claim 1, wherein said hook includes a first hook portion extending downwardly from said frame front edge and a second hook portion extending forwardly and upwardly from the lowermost end of said first hook portion, said second hook portion having a rearwardly extending lip for snappedly engaging said flange rib.
Claim 4
Dependent Claim
35 words
A stair nosing as in claim 1, wherein said tongue-shaped protector comprises means for providing a clearance between said engaging portion and said protector while said flange rib is being snappedly engaged into said hook.
Claim 5
Dependent Claim
38 words
A stair nosing as in claim 1, wherein said flange is shaped so to be spaced from the portion of said hook which is engagable with the riser, when said flange rib is snappedly engaged in said hook.
Claim 6
Dependent Claim
53 words
A stair nosing as in claim 1, further comprising a longitudinally extending upwardly projecting frame rib formed on the upper surface of said frame, said frame rib having an abutment surface inclined toward said inturned bead, the lower surface of said connecting plate having a longitudinally extending groove for receiving said frame rib.
Claim 7
Dependent Claim
25 words
A stair nosing as in claim 1, wherein said tread includes a hollow portion adjacent to and extending generally parallel to said tread front edge.
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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |