Patent US3912408A successfully refreshed from Google Patents.
US3912408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cover for channels and ducts
Assignee: Individual
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Filing: 1974-03-14
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Granted: 1975-10-14
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Expires: 1994-03-14
Abstract
Abstract A cover for a floor channel or duct for services is comprised of transverse metal, preferably inverted, L-shaped bars flexibly connected together by wires running lengthwise of the duct so that the cover can be simply rolled up and unrolled to uncover and re-cover the duct. In the laid condition, the horizontal flange of each bar is supported by the vertical flange of the next bar, and the vertical flanges are supported on the duct frame with the upper surfaces of the horizontal flanges flush with the floor surface.
Inventors
- 👤 Arno Domnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:08
CPC Classifications
E; E04; E04F; E04F19/00; E04F19/08; H; H02; H02G; H02G9/00; H02G9/02; H02G9/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A collapsible cover assembly for covering channels, ditches and the like, the cover comprising a pLurality of rigid individual strips which, jointly form a substantially plane closed supporting surface when said cover assembly is in an operative non-collapsible state, and connecting means flexibly joining said individual strips to each other, said assembly is collapsed by being rolled into a roll, said individual strips being substantially parallel to the axis of said roll, said connecting means including at least one wire which is connected to said individual strips and extends transversely thereto, said individual strips have the shapes of inverted angle irons when said cover assembly is in an operative state, each of said inverted angle iron-shaped individual strips having a horizontal leg forming said supporting surface and a vertical leg forming a back, the free edge of the horizonal leg of each individual strip bearing against the back of the adjacent individual strip.
Claim 2
Dependent Claim
153 words
A collapsible cover assembly for covering channels, ditches and the like, the cover comprising a pLurality of rigid individual strips which, jointly form a substantially plane closed supporting surface when said cover assembly is in an operative non-collapsible state, and connecting means flexibly joining said individual strips to each other, said assembly is collapsed by being rolled into a roll, said individual strips being substantially parallel to the axis of said roll, said connecting means including at least one wire which is connected to said individual strips and extends transversely thereto, said individual strips have the shapes of inverted angle irons when said cover assembly is in an operative state, each of said inverted angle iron-shaped individual strips having a horizontal leg forming said supporting surface and a vertical leg forming a back, the free edge of the horizonal leg of each individual strip bearing against the back of the adjacent individual strip.
Claim 3
Dependent Claim
36 words
The cover assembly as set forth in claim 1, wherein said individual angle irons are supported by the horizontal leg of the adjacent individual angle iron when said cover assembly is in an operative non-collapsed state.
Claim 4
Dependent Claim
44 words
The cover assembly as set forth in claim 2, wherein each vertical leg of said individual strips has at least one projection extending therefrom at a distance from said supporting surface corresponding substantially to the thickness of a horizontal leg of said individual strips.
Claim 5
Dependent Claim
48 words
The cover assembly as set forth in claim 2, wherein each one of said individual strips has along the edge formed by the juncture of the horizontal and vertical legs a recess extending from said supporting surface and having depth corresponding to the thickness of said horizontal leg.
Claim 6
Dependent Claim
34 words
The cover assembly as set forth in claim 2, wherein said individual strips have downwardly open slits when said cover assembly is in an operative noncollapsed state, said wire being disposed in said slits.
Claim 7
Dependent Claim
22 words
The cover assembly as set forth in claim 5, wherein said wire has a plastic coating and is pressed into said slits.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |