| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a frame which can be formed without lowering the strength of the frame by installing a press part on the front side and projections on the rear side and holding an air purification filter in the frame by the press part and the projections. SOLUTION: In a filter frame 3, a press part 33 composed of two horizontal beams 33a and numbers of vertical beams 33b is installed on the front side, and when the frame is attached to an air filter 5, a filter 1 is pressed to the air filter 5 by the press part 33. Nearly rectangular notch parts 37 are formed close to both ends of each horizontal beam 33a, and a reinforcing flange 38 with the outside end surface curved recessingly is formed on the outside of the notch part 37. On the rear side of the frame 3, projections 36 projecting from the upper and lower end surfaces to the inside are formed at positions opposite to the notch part 37, and the filter 1 is held in the frame 3 by the collaboration of the projections and the press part 33.</p> |
