| 摘要 |
A nestable frame for planar air filters or other screen-like planar structures. The nestable frame provides all of the following desirable properties at once: 1. Simple manufacturing and assembly process, 2. Simple design, 3. Enhanced structural rigidity, 4. Significant space-savings during storage and transport, and 5. Simple handling. Preferably, the filter frame comprises an upper and a lower frame portion with a first leg each, where the peripheral edge of the filter media is clampingly engaged between the first leg of the upper frame portion and the first leg of the lower frame portion. From the first leg, the upper frame portion extends outwardly with at least two legs folded into a vertically flipped V. The lower frame portion consists of at least two full and a third partial leg, and may or may not have additional legs extending outwardly, in parallel direction and intimately connected to the legs of the upper frame portion. There are no voids between any of the legs in the V-shaped region of the upper frame portion and the lower frame portion. Alternative embodiments may be of different cross-sectional shapes that widen the vertically flipped V cross-section, again with various numbers of legs in the upper and lower frame portions. Further included in the present invention are manufacturing methods for the stackable frame.
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