초록

A filter including a resilient frame, a hollow body of pleated paper, and end closures, molded together to make a flexible unitary structure which maintains its shape and has the efficiency characteristics of the paper medium.

대표청구항 ▼

A replacement filter for use in a filter housing having an elongated rectangular opening through which the filter is inserted, comprising: a supporting frame of generally rectangular configuration dimensioned to overlie the rectangular housing opening and defining front and back faces, the frame com

A replacement filter for use in a filter housing having an elongated rectangular opening through which the filter is inserted, comprising: a supporting frame of generally rectangular configuration dimensioned to overlie the rectangular housing opening and defining front and back faces, the frame comprising a first pair of elongated sides spaced apart to define an elongated opening therebetween, and a second pair of shorter sides connecting the ends of the first pair; a filter body of pleated filter material, the body being flexible about the pleats and formed into a substantially U-shaped configuration that defines first and second adjacent ends and first and second substantially U-shaped edges, the filter body having a dimension extending in the direction of the pleats that approximates the length of the elongated frame opening and a predetermined insertion dimension; means for sealably securing the first and second filter body ends to the first and second frame sides, respectively, so that the U-shaped filter body projects rearwardly from the back face of the supporting frame over said insertion dimension; and a resiliently flexible closure member sealably secured to each of said second pair of shorter sides and to the associated U-shaped filter body edge, so that air entering the frame opening must pass through the filter body and vice versa, the filter body and closure members in their assembled state being together flexible between a first configuration in which the filter body is substantially straight over its insertion dimension and a second configuration in which the filter body is substantially curved over the insertion dimension with said pleats always remaining substantially mutually parallel, whereby the filter may be inserted through the rectangular housing opening where the available space in front of the housing is less than the insertion dimension of the filter body.