Patent US4580381A successfully refreshed from Google Patents.
US4580381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frame
Assignee: H Krantz GmbH and Co
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Filing: 1984-08-06
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Granted: 1986-04-08
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Expires: 2004-08-06
Abstract
Abstract Angular sections form frames which can be fitted together in the frame plane in modular fashion. Legs of the sections are formed so that through two interconnected legs of adjacent frames notches of T-shaped cross-section result, into which hammer head-shaped ends of pull rods can be introduced. By means of the pull rods, ledges can be pressed against filter and/or light fixture housings, which in this manner are pressed against legs of the profiles on the opposite housing side, adjacent frames thus make it possible in a correspondingly compact model to attach filters and light fixtures without the distance between two adjacent filters or between a filter and a light fixture occupying a width that would impair the flow profile of the air issuing from the filters.
Inventors
- 👤 Franc Sodec
- 👤 Werner Veldboer
- 👤 Horst Wannagat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:20
CPC Classifications
F; F21; F21V; F21V33/00; F21V33/0088; F21V21/00; F21V21/02; F21V21/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
226 words
A frame structure for mounting in the ceiling or wall of a room, said structure comprising a pair of rectangular frame members, each said frame member being formed of four frame sections, a frame section of each of said frame members being disposed in back to back abutting relation to and being connection to a frame section of the other said frame member, said abutting frame sections each including a leg member extending in a direction normal to the plane of said frame members and having an outwardly open U-shaped notch, the notches of said abutting section together defining a generally T-shaped groove opening in a direction away from the plane of said fame members, generally T-shaped headed members insertable endwise into said groove, said headed members including a threaded portion accessible through said groove, pull rods having first ends threadedly connected to said threaded portions of said headed members, and locking ledges threadedly connected to the ends of said pull rods remote from said first ends, said ledges being shiftable on said rods toward and away from said frame members whereby to clamp housings between said frame members and ledges, said ledges including outwardly directed surfaces facing away from said frames, said surfaces of said ledges including laterally directed slits, the combination including cover plates having laterally inwardly directed lip portions supported in said slits.
Claim 2
Dependent Claim
226 words
A frame structure for mounting in the ceiling or wall of a room, said structure comprising a pair of rectangular frame members, each said frame member being formed of four frame sections, a frame section of each of said frame members being disposed in back to back abutting relation to and being connection to a frame section of the other said frame member, said abutting frame sections each including a leg member extending in a direction normal to the plane of said frame members and having an outwardly open U-shaped notch, the notches of said abutting section together defining a generally T-shaped groove opening in a direction away from the plane of said fame members, generally T-shaped headed members insertable endwise into said groove, said headed members including a threaded portion accessible through said groove, pull rods having first ends threadedly connected to said threaded portions of said headed members, and locking ledges threadedly connected to the ends of said pull rods remote from said first ends, said ledges being shiftable on said rods toward and away from said frame members whereby to clamp housings between said frame members and ledges, said ledges including outwardly directed surfaces facing away from said frames, said surfaces of said ledges including laterally directed slits, the combination including cover plates having laterally inwardly directed lip portions supported in said slits.
Claim 3
Dependent Claim
17 words
A device in accordance with claim 1 wherein said outwardly directed surfaces of said ledges are beveled.
Claim 4
Dependent Claim
18 words
A device in accordance with claim 2 wherein the included angle between said beveled surfaces is substantially 90°.
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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |