Air filter having pockets, and method of assembly thereof
First Claim
1. A filter for a flowing gaseous medium havinga frame element (1);
- a plurality of adjacently located filter bags (4) of a material which is gas-permeable with respect to said medium, and open to the flow of the gaseous medium; and
parallel positioned bag supporting ribs (6) having end portions supported by said frame,wherein, in accordance with the invention,the supporting ribs comprise zig-zag folded rib structures (6), which are folded from a blank (11, 11'"'"') in zig-zag form,said folded rib structures including support legs extending at essentially right angles therefrom, and supported on the frame element (1), andwherein the gas-permeable material of said bags of adjacent filter pockets (4) is retained between the folds (9, 10'"'"';
9, 10";
9,
10) of the zig-zag folded rib structures (6).
1 Assignment
0 Petitions
Accused Products
Abstract
The filter, typically an air cleaning filter, has a frame element, preferably rectangular or square, retaining a plurality of adjacently located filter bags (4). The filter bags, themselves, are retained in the frame by bag-supporting ribs (6) which are folded from blanks (11, 11'"'"') in zig-zag fashion to define a central folded part 9, and two lateral folded portions (10, 10"10). To assemble the filter, adjacent filter bags are inserted and then clamped between the central portion and a lateral folded portion, and held together for example by adhesives, staples, or the like. The ends of the rib structures (6) define support legs (12, 12") which are secured to the frame element (1). The position of the ribs (6) determines the spacing of the filter bags (4). A spacing comb (14) formed with slits (16) determines the spacing between the opening of adjacent filter bags. The structure permits easy matching of filter bags to different dimensions of frame elements. Preferably, all materials used, frame element (1), filter bags (4) and ribs (6), are made of combustible material, for example paper and cardboard, or the like, so that the filter, including contents, can be incinerated as a unit.
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Citations
14 Claims
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1. A filter for a flowing gaseous medium having
a frame element (1); -
a plurality of adjacently located filter bags (4) of a material which is gas-permeable with respect to said medium, and open to the flow of the gaseous medium; and parallel positioned bag supporting ribs (6) having end portions supported by said frame, wherein, in accordance with the invention, the supporting ribs comprise zig-zag folded rib structures (6), which are folded from a blank (11, 11'"'"') in zig-zag form, said folded rib structures including support legs extending at essentially right angles therefrom, and supported on the frame element (1), and wherein the gas-permeable material of said bags of adjacent filter pockets (4) is retained between the folds (9, 10'"'"';
9, 10";
9,
10) of the zig-zag folded rib structures (6). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method to make a filter assembly comprising the steps of
providing a frame element (1); -
providing a plurality of filter bags or pockets (4) of a gas-permeable material; providing supporting rib blanks (9); forming, on said supporting blanks, a central fold line (8) and, spaced therefrom, two lateral fold lines (10a, 10b) to define a central portion (9'"'"', 9") and outer portions (10'"'"', 10"), and outer projecting flaps (12'"'"') connected to the lateral portions by outer fold lines (12a, 12b); subsequently folding the blank about the fold lines in zig-zag fashion and simultaneously inserting end portions of the pockets in the blank, as it is being folded, between the outer portions (10'"'"', 10") and the adjacent central portions (9'"'"', 9") as the blank is being folded about the center fold line (8) and the lateral fold lines (10a, 10b); securing the end portions of the pockets or bags in clamped position; changing, in the folding step, the orientation of the projecting flaps (12) by folding about the outer fold lines (12a, 12b) to be essentially perpendicular to the orientation of the zig-zag folded blank (9); and securing the so re-oriented flaps (12'"'"'), forming attachment legs (12), on the frame element (1'"'"'). - View Dependent Claims (12, 13, 14)
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Specification