US3680286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: NEFCO FILTER CORP
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Filing: 1970-05-26
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Granted: 1972-08-01
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Expires: 1990-05-26
Abstract
Abstract For removing dust from air, a safety filter comprising a working filter unit subassembly and safety filter element are housed within a preferably rectangular shell and combined with a centrifugal precleaner. The working filter unit comprises a plurality of spaced cylindrical filter elements permanently mounted in plastic end plates. Flow is from outside to the inside of the cylindrical elements. Mounting of the precleaner automatically clamps the working filter unit in position and seals the passageway to the safety filter element.
Inventors
- 👤 William G Nostrand
- 👤 Clifford G Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:46
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0084; B01D46/0095; B01D46/24; B01D46/2403; B01D46/2411; B01D46/56; B01D46/58; B01D46/62; B01D50/00; B01D50/20; B01D2265/00; B01D2265/02; B01D2265/024; B01D2265/025; Y; Y10; Y10S; Y10S55/00; Y10S55/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
350 words
An air cleaner comprising a shell having one end open and the other end closed except for an air outlet opening, a working filter unit arranged within said shell, said working filter unit comprising a cluster of spaced, parallel generally cylindrical filter elements of equal length, a wall surrounding said cluster in spaced relationship thereto, and an inlet end plate spanning and engaging one end of said cluster and surrounding wall and an outlet end plate spanning and engaging the other end of said cluster and wall, said inlet end plates being composed of plastic material and the respective end portions of said cylindrical filter elements and of said wall surrounding said cluster of filter elements being embedded in the plastic material of said respective end plates, said inlet end plate having openings therein between said filter elements to permit the flow of air into the space around and between said elements, said outlet end plate having openings therein at the ends of said filter elements to permit the flow of air through said plate from the interior of said elements; a safety filter element disposed within said shell at the closed end thereof, means for mounting said safety filter in Said shell and channelling the flow of air from said working filter unit to said safety filter element, said means comprising an internal flange fastened to said shell, a spider plate supporting said safety filter element, a gasket sandwiched between the peripheral portion of said spider plate and said flange, and means for pressing said working filter unit against said spider plate whereby to press said plate against said flange to hold plate in position and effect a seal at said gasket, said last mentioned means comprising an end plate spanning the open end of said shell and having an air inlet opening therein, a collar disposed within the open end portion of said shell in telescoping relation therewith, and means for drawing said end plate toward said shell to simultaneously force said collar and thus said working filter unit inwardly and close the open end of said shell.
Claim 2
Dependent Claim
350 words
An air cleaner comprising a shell having one end open and the other end closed except for an air outlet opening, a working filter unit arranged within said shell, said working filter unit comprising a cluster of spaced, parallel generally cylindrical filter elements of equal length, a wall surrounding said cluster in spaced relationship thereto, and an inlet end plate spanning and engaging one end of said cluster and surrounding wall and an outlet end plate spanning and engaging the other end of said cluster and wall, said inlet end plates being composed of plastic material and the respective end portions of said cylindrical filter elements and of said wall surrounding said cluster of filter elements being embedded in the plastic material of said respective end plates, said inlet end plate having openings therein between said filter elements to permit the flow of air into the space around and between said elements, said outlet end plate having openings therein at the ends of said filter elements to permit the flow of air through said plate from the interior of said elements; a safety filter element disposed within said shell at the closed end thereof, means for mounting said safety filter in Said shell and channelling the flow of air from said working filter unit to said safety filter element, said means comprising an internal flange fastened to said shell, a spider plate supporting said safety filter element, a gasket sandwiched between the peripheral portion of said spider plate and said flange, and means for pressing said working filter unit against said spider plate whereby to press said plate against said flange to hold plate in position and effect a seal at said gasket, said last mentioned means comprising an end plate spanning the open end of said shell and having an air inlet opening therein, a collar disposed within the open end portion of said shell in telescoping relation therewith, and means for drawing said end plate toward said shell to simultaneously force said collar and thus said working filter unit inwardly and close the open end of said shell.
Claim 3
Dependent Claim
284 words
An air cleaner comprising a shell open at its inlet end and closed at its outlet end; said shell having an internal flange spaced from said outlet end and being otherwise free of internal fittings; said shell having an outlet opening between said flange and said outlet end; a spider plate demountably and sealingly fastened to said flange and having air flow openings therein; a safety filter element mounted on the downstream side of said spider plate and interposed between said openings therein and said shell outlet opening; a working filter unit arranged within said shell upstream of and in peripheral contact with said spider plate; said working filter unit comprising a cluster of spaced parallel generally cylindrical filter elements of equal length, a wall surrounding said cluster in spaced relationship thereto, an inlet end plate spanning and sealingly engaging the upstream end of said cluster and surrounding wall and having openings therein communicating with the space around said cylindrical filter elements, an outlet end plate spanning and sealingly engaging the downstream end of said cluster and surrounding wall and having openings therein communicating with the interiors of said cylindrical filter elements; and a precleaner subassembly mounted upon said shell at the open inlet end thereof; said precleaner subassembly including a base plate spanning the open end of said shell and having an air flow opening therein and a collar attached to said base plate and telescopically extending into said shell and engaging the periphery of said inlet end plate; and means for drawing said base plate toward said shell whereby to close said open end of said shell and clamp said working filter unit in position between said collar and said spider plate.
Claim 4
Dependent Claim
284 words
An air cleaner comprising a shell open at its inlet end and closed at its outlet end; said shell having an internal flange spaced from said outlet end and being otherwise free of internal fittings; said shell having an outlet opening between said flange and said outlet end; a spider plate demountably and sealingly fastened to said flange and having air flow openings therein; a safety filter element mounted on the downstream side of said spider plate and interposed between said openings therein and said shell outlet opening; a working filter unit arranged within said shell upstream of and in peripheral contact with said spider plate; said working filter unit comprising a cluster of spaced parallel generally cylindrical filter elements of equal length, a wall surrounding said cluster in spaced relationship thereto, an inlet end plate spanning and sealingly engaging the upstream end of said cluster and surrounding wall and having openings therein communicating with the space around said cylindrical filter elements, an outlet end plate spanning and sealingly engaging the downstream end of said cluster and surrounding wall and having openings therein communicating with the interiors of said cylindrical filter elements; and a precleaner subassembly mounted upon said shell at the open inlet end thereof; said precleaner subassembly including a base plate spanning the open end of said shell and having an air flow opening therein and a collar attached to said base plate and telescopically extending into said shell and engaging the periphery of said inlet end plate; and means for drawing said base plate toward said shell whereby to close said open end of said shell and clamp said working filter unit in position between said collar and said spider plate.
Claim 5
Dependent Claim
33 words
An air cleaner in accordance with claim 2 wherein said shell is rectangular in cross section and said working filter unit and said spider plate conforms to the rectangular shape of said shell.
Claim 6
Dependent Claim
42 words
An air cleaner in accordance with claim 2 wherein said end plates are composed of plastic material and the respective ends of said cluster of filter elements and said surrounding wall are embedded in the plastic material of said end plates respectively.
References Cited (Backward Citations)
US3540190A
Cited
US3350860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |