| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily clean a pre-filter by a vacuum cleaner. <P>SOLUTION: An auxiliary duct end 14a is connected to a suction opening 11 which has bars 11a provided on an air cleaner body 10, a dust sensor 1 is connected to the auxiliary duct end 14a with an air passage hole 1b centered, and an auxiliary duct 14 is connected to the dust sensor 1. For example, as shown in Fig. 1, the polyurethane, rectangular parallelepiped pre-filter 1a made out of a sponge material is mounted so as to come into contact with the bars 11a in the auxiliary duct end 14a which is square or rectangular in cross section, two springs 20 each having a substantially U shape are crossed and inserted from the rear, and the crossed part is brought into contact with the pre-filter 1a, and pressed to be fixed against quadrangular diagonal side walls of the auxiliary duct end 14a. <P>COPYRIGHT: (C)2003,JPO |
