Patent US4632680A successfully refreshed from Google Patents.
US4632680A
Expired / Lapsed
US
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Planar sided air shaping inserts for filter bags
Assignee: Howden Environmental Systems Inc
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Filing: 1985-10-28
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Granted: 1986-12-30
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Expires: 2005-10-28
Abstract
Abstract Air shaping mouth inserts for bag type air filters formed as planar sided tubes of rectangular and triangular cross section are inserted into the open ends of the bags. Their mouths are sealed to the bag rim so that air flow is restricted to the interior of the tube insert. This type of insert facilitates shaping and distribution of the reverse jet cleaning pulse by rotating the tubes around the axis or by altering the straight sides to unbalance the cross section of the air flow path.
Inventors
- 👤 William J. Klimczak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:06
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0002; B01D46/0004; B01D46/66; B01D46/70; B01D46/71; B01D2271/00; B01D2271/02; B01D2271/027
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
168 words
An air shaping insert for filter bag mouths of a multiple bag filter assembly in which the filter bags extend from a tube sheet which separates a dirty air region from a filtered air region and in which the bag mouths open into the filtered air region, the insert comprising: a sealing means which holds the filter bag onto the tube sheet so that the filter bag seals around a hole in the tube sheet and restricts air flow through the tube sheet to air which passes through the bag mouth; an insert disc concentric with the sealing means and slideably attached to it so that the insert disc may be rotated relative to the sealing means, the insert disc including an opening; an insert body attached at the opening of the insert disc, determining the configuration of the opening and extending into the filter bag, the insert body being formed of planar sides extending transverse to the tube sheet, and the insert body having straight-sided cross sections.
Claim 2
Dependent Claim
168 words
An air shaping insert for filter bag mouths of a multiple bag filter assembly in which the filter bags extend from a tube sheet which separates a dirty air region from a filtered air region and in which the bag mouths open into the filtered air region, the insert comprising: a sealing means which holds the filter bag onto the tube sheet so that the filter bag seals around a hole in the tube sheet and restricts air flow through the tube sheet to air which passes through the bag mouth; an insert disc concentric with the sealing means and slideably attached to it so that the insert disc may be rotated relative to the sealing means, the insert disc including an opening; an insert body attached at the opening of the insert disc, determining the configuration of the opening and extending into the filter bag, the insert body being formed of planar sides extending transverse to the tube sheet, and the insert body having straight-sided cross sections.
Claim 3
Dependent Claim
17 words
The air shaping insert of claim 1 wherein the cross sections of the insert body are triangles.
Claim 4
Dependent Claim
17 words
The air shaping insert of claim 1 wherein the cross sections of the insert body are rectangular.
Claim 5
Dependent Claim
37 words
The air shaping insert of claim 1 further including bendable junctions between the planar sides of the insert body to permit adjustment of the angles of the joints to adjust the cross section of the insert body.
Claim 6
Dependent Claim
29 words
The air shaping insert of claim 1 further including filler volumes attached to the planar sides of the insert body to adjust the cross section of the insert body.
Claim 7
Dependent Claim
47 words
The air shaping insert of claim 1 further including a "L" shaped bend in one side of the insert body, with the small leg of the "L" oriented approximately in the plane of the mouth of the bag, to reduce the cross section of the insert body.
References Cited (Backward Citations)
US3509698A
Cited
US3499268A
Cited
US3594992A
Cited
US3606736A
Cited
US3685257A
Cited
US3729903A
Cited
US3816978A
Cited
US3798878A
Cited
US3891418A
Cited
US4033732A
Cited
US4046526A
Cited
US3999968A
Cited
US4251244A
Cited
US4336035A
Cited
US4272263A
Cited
US4278454A
Cited
US4231770A
Cited
US4504293A
Cited
US4401446A
Cited
US4504288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |