US3871848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter with bags
Assignee: Donaldson Co Inc
•
Filing: 1973-09-24
•
Granted: 1975-03-18
•
Expires: 1993-09-24
Abstract
Abstract A row of filter bags disposed side by side extend rearwardly from a rectangular frame, in which spaced parallel intermediate channel member clamp together adjoining sides of the open rectangular front ends of the bags, with the ends of the channels overlapping the front surfaces of flange members projecting inwardly from two opposite sides of the frame. Similar channel members are clamped onto the outer sides of the open ends of the two outermost bags and extend along the front surfaces of the flange members at the other two sides of the frame. Means are provided for holding this last pair of channel members in place with the adjoining areas of the outermost bags engaging the lastmentioned flange members. The portions of the bags that span the spaces between the opposite ends of the channel members overlapping the front surfaces of the first-mentioned pair of flange members being pulled into sealing engagement with those flanges when the bags are inflated behind the frame.
Inventors
- 👤 Wayne L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:40
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/023
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
246 words
An air filter comprising a rectangular frame having a front and back, the back being provided with flange members projecting inwardly from the four sides of the frame, a row of filter bags disposed side by side behind the frame and having rectangular open front ends projecting forward into the frame, spaced parallel intermediate elongated channel members in the frame, each of said channel members receiving and clamping together adjoining side walls of the open ends of two of the bags, each channel member having opposite ends overlapping the front surfaces of said flange members at two opposite sides of the frame, a pair of end elongated channel members spaced from the intermediate channel members and receiving and clamped onto the outer sides of the open ends of the two outermost bags in said row, said end channel members extending along the front surfaces of the flange members at the other two sides of the frame, and holding means engaging said end channel members to hold them in place with the areas of said outer sides of said outermost bags that are between the end channel members and said last-mentioned flange members engaging said last-mentioned flange members, the portions of the bags that span the spaces between the channel members at the opposite ends of those members overlapping the front surfaces of said first-mentioned pair of flange members being pulled into sealing engagement with said first-mentioned flange members when the bags are inflated behind the frame.
Claim 2
Dependent Claim
246 words
An air filter comprising a rectangular frame having a front and back, the back being provided with flange members projecting inwardly from the four sides of the frame, a row of filter bags disposed side by side behind the frame and having rectangular open front ends projecting forward into the frame, spaced parallel intermediate elongated channel members in the frame, each of said channel members receiving and clamping together adjoining side walls of the open ends of two of the bags, each channel member having opposite ends overlapping the front surfaces of said flange members at two opposite sides of the frame, a pair of end elongated channel members spaced from the intermediate channel members and receiving and clamped onto the outer sides of the open ends of the two outermost bags in said row, said end channel members extending along the front surfaces of the flange members at the other two sides of the frame, and holding means engaging said end channel members to hold them in place with the areas of said outer sides of said outermost bags that are between the end channel members and said last-mentioned flange members engaging said last-mentioned flange members, the portions of the bags that span the spaces between the channel members at the opposite ends of those members overlapping the front surfaces of said first-mentioned pair of flange members being pulled into sealing engagement with said first-mentioned flange members when the bags are inflated behind the frame.
Claim 3
Dependent Claim
32 words
An air filter according to claim 1, in which said flange members consist of flanges integral with the sides of the frame, and gasket strips engaging the front surfaces of the flanges.
Claim 4
Dependent Claim
102 words
An air filter according to claim 1, in which each of said end channel members has a front and back and inner and outer sides, said channel-holding means include clips clamped onto each of said last-mentioned flange members, each of the clips having a leg extending forward in the frame between the inner surface of the frame and the outer side of the adjoining end channel member, and a retaining member secured to the leg and having a portion overlapping the front and inner side of said end channel member to hold that channel member close to the flange member behind it.
Claim 5
Dependent Claim
50 words
An air filter according to claim 3, including means pivoting said retaining member to said clip leg on an axis perpendicular to the adjacent side of the frame, whereby the end of the retaining member can be swung away from the channel member engaged by it to release that member.
Claim 6
Dependent Claim
62 words
An air filter according to claim 4, in which said retaining member extends forward in the frame and has a front end provided with an inwardly directed shoulder forming a space between the shoulder and the portion of the retaining member that overlaps the front of an end channel member for receiving one side of a prefilter in front of said bags.
Claim 7
Dependent Claim
153 words
An air filter unit for use with a rectangular frame having a front and a back, comprising a row of filter bags disposed side by side and having open front ends, each of the bags having two opposite sides substantially in contact with each other, parallel intermediate elongated channel members, each of said members clamping together adjoining sides of the open ends of two of the bags, and a pair of end elongated channel members clamped onto the outer sides of the open ends of the two outeRmost bags in said row, the length of said channel members being materially less than the length of said bag sides, and the channel members being so located on the bag sides that when said end channel members are pulled laterally away from each other all of said channel members will be spread apart to provide the bags with open front ends that are substantially rectangular.
Claim 8
Dependent Claim
153 words
An air filter unit for use with a rectangular frame having a front and a back, comprising a row of filter bags disposed side by side and having open front ends, each of the bags having two opposite sides substantially in contact with each other, parallel intermediate elongated channel members, each of said members clamping together adjoining sides of the open ends of two of the bags, and a pair of end elongated channel members clamped onto the outer sides of the open ends of the two outeRmost bags in said row, the length of said channel members being materially less than the length of said bag sides, and the channel members being so located on the bag sides that when said end channel members are pulled laterally away from each other all of said channel members will be spread apart to provide the bags with open front ends that are substantially rectangular.
References Cited (Backward Citations)
US2771155A
Cited
US3524304A
Cited
US3099547A
Cited
US3204392A
Cited
US3250063A
Cited
US3394534A
Cited
US3616625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |