Patent US4256473A successfully refreshed from Google Patents.
US4256473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter bag attaching means
Assignee: Spencer Turbine Co
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Filing: 1979-10-05
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Granted: 1981-03-17
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Expires: 1999-10-05
Abstract
Abstract Apparatus for filtering dust particles from air has a bag head and a bag assembly which includes a filter bag and a skeletal bag frame received within the bag. A cylindrical bag frame collar secured to the upper end of the bag frame threadably engages a cylindrical bag head collar which depends from the bag head. Threads on the head collar are formed by rods tack welded to the outer surface of the collar. The bag frame collar receives the head collar therein and has two rivets and an adjustable bolt equiangularly spaced and projecting radially inwardly to engage the threads on the head collar. The bolt serves to lock the two collars in assembly and prevent relative rotation and loosening due to vibration.
Inventors
- 👤 Dominick De Martino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:04
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
In an air filtering apparatus having a bag head, a bag filter assembly including a filter bag and a skeletal bag frame received within the filter bag and means for supporting the bag filter assembly on the bag head the improvement wherein said supporting means comprises a cylindrical bag head collar mounted on said bag head, a cylindrical bag frame collar mounted on said bag frame, one of the collars received in the other of the collars, a plurality of studs mounted in angularly spaced relation on one of said collars and projecting in one generally radial direction from said one collar, and means for defining a thread on the other of said collars threadably engaged with said studs, and clamping means for releasably securing said collars in clamped relation to each other, said clamping means comprising one of said studs.
Claim 2
Dependent Claim
141 words
In an air filtering apparatus having a bag head, a bag filter assembly including a filter bag and a skeletal bag frame received within the filter bag and means for supporting the bag filter assembly on the bag head the improvement wherein said supporting means comprises a cylindrical bag head collar mounted on said bag head, a cylindrical bag frame collar mounted on said bag frame, one of the collars received in the other of the collars, a plurality of studs mounted in angularly spaced relation on one of said collars and projecting in one generally radial direction from said one collar, and means for defining a thread on the other of said collars threadably engaged with said studs, and clamping means for releasably securing said collars in clamped relation to each other, said clamping means comprising one of said studs.
Claim 3
Dependent Claim
29 words
In a filtering apparatus as set forth in claim 1 the further improvement wherein said one stud is threadably connected to said one collar for radial adjustment relation thereto.
Claim 4
Dependent Claim
27 words
In a filtering apparatus as set forth in either claim 1 or claim 2 including means for releasably securing said filter bag to said bag frame collar.
Claim 5
Dependent Claim
37 words
In a filtering apparatus as set forth in claim 3 the further improvement wherein said means for releasably securing said bag comprises a clamping band surrounding associated portions of said filter bag and said bag frame collar.
Claim 6
Dependent Claim
27 words
In a filtering apparatus as set forth in claim 4 the further improvement wherein said bag frame collar has a radially outwardly projecting annular bead formed thereon.
Claim 7
Dependent Claim
56 words
In a filtering apparatus as set forth in either claim 1 or claim 2 the further improvement including a resilient annular gasket disposed adjacent said bag head and said bag head collar and a radially outwardly projecting annular flange on said bag frame collar engaging said gasket when said studs are threadably engaged with said thread.
Claim 8
Dependent Claim
35 words
In a filtering apparatus as set forth in either claim 1 or claim 2 the further improvement wherein said bag head collar comprises said one collar and said bag frame collar comprises said other collar.
Claim 9
Dependent Claim
120 words
In an air filtering apparatus having a bag head, a bag filter assembly including a filter bag and a skeletal bag frame received within the filter bag and means for supporting the bag filter assembly on the bag head the improvement wherein said supporting means comprises a cylindrical bag head collar mounted on said bag head, a cylindrical bag frame collar mounted on said bag frame, one of the collars received in the other of the collars, a plurality of studs mounted in angularly spaced relation on one of said collars and projecting in one generally radial direction from said one collar, and means for defining a thread on the other of said collars in threadable engagement with said studs.
Claim 10
Dependent Claim
120 words
In an air filtering apparatus having a bag head, a bag filter assembly including a filter bag and a skeletal bag frame received within the filter bag and means for supporting the bag filter assembly on the bag head the improvement wherein said supporting means comprises a cylindrical bag head collar mounted on said bag head, a cylindrical bag frame collar mounted on said bag frame, one of the collars received in the other of the collars, a plurality of studs mounted in angularly spaced relation on one of said collars and projecting in one generally radial direction from said one collar, and means for defining a thread on the other of said collars in threadable engagement with said studs.
Claim 11
Dependent Claim
31 words
In a filtering apparatus as set forth in claim 8 the further improvement wherein said bag head collar comprises said one collar and said bag frame collar comprises said other collar.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |