US4185657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Economy, angle-blade damper kit
Assignee: PREFCO PRODUCTS Inc
•
Filing: 1978-03-29
•
Granted: 1980-01-29
•
Expires: 1998-03-29
Abstract
Abstract A novel damper kit is described wherein blade stock having a hook-shaped hinge portion formed therein, and notched angle bracket stock having periodically spaced hook-shaped hinge elements formed therealong can easily be cut and assembled at the job site to custom fit and install a damper in a duct, opening, or plenum.
Inventors
- 👤 Francis J. McCabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:02
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; A62C2/14; A62C2/16; E; E06; E06B; E06B7/00; E06B7/02; E06B7/08; E06B7/084; F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/15; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/8741; Y10T137/87442; Y10T137/87467; Y10T137/87475
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A kit for constructing a damper inside an opening, said kit comprising: (a) blade stock having a hook-shaped hinge portion formed therein, said hook-shaped hinge portion extending uniformly across substantially the entire longitudinal length of said blade stock and said blade stock being easily divisible into a plurality of blade members; and (b) notched angle stock for two opposing sides of said opening, said notched angle stock comprising at least one transverse portion and one face strip portion, said face strip portion having periodically spaced hook-shaped hinge elements formed therealong for receiving and, upon pivoting of the blade when received thereby, for slidingly engaging portions of said hook-shaped hinge portion of said blade stock, and said transverse portion having means for use in attaching said stock to an interior surface of said opening, said notched angle stock being easily cut and fastened within said opening.
Claim 2
Dependent Claim
145 words
A kit for constructing a damper inside an opening, said kit comprising: (a) blade stock having a hook-shaped hinge portion formed therein, said hook-shaped hinge portion extending uniformly across substantially the entire longitudinal length of said blade stock and said blade stock being easily divisible into a plurality of blade members; and (b) notched angle stock for two opposing sides of said opening, said notched angle stock comprising at least one transverse portion and one face strip portion, said face strip portion having periodically spaced hook-shaped hinge elements formed therealong for receiving and, upon pivoting of the blade when received thereby, for slidingly engaging portions of said hook-shaped hinge portion of said blade stock, and said transverse portion having means for use in attaching said stock to an interior surface of said opening, said notched angle stock being easily cut and fastened within said opening.
Claim 3
Dependent Claim
75 words
The invention of claim 1 wherein said blade stock further has a hook-shaped end portion extending along at least one longitudinal edge thereof; and wherein said angle stock further has a plurality of periodically spaced clearance notches in said face strip portion between said hook-shaped hinge portions for allowing said hook-shaped end portions of adjacent blade members in the closed position to extend therethrough to create a seal along the entire length of said blade.
Claim 4
Dependent Claim
60 words
The invention of claim 1 wherein said kit further comprises additional angle bracket material for mounting on the interior surfaces of said opening spaced from and transverse to said notched angled stack and for creating inwardly depending flanges within said opening to engage longitudinal tips of the endmost blades of said damper when those blades are in the closed position.
Claim 5
Dependent Claim
17 words
The invention of claim 3 wherein said additional angle bracket material is comprised of notched angle stock.
Claim 6
Dependent Claim
14 words
The invention of claim 1 wherein said damper is a rotating blade fire damper.
Claim 7
Dependent Claim
12 words
The invention of claim 1 wherein said damper is a backdraft damper.
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) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |