| 摘要 |
An air purifier (10) is disclosed which includes a housing (11) having a top wall with a schedule indicator (14). The housing top wall has a central recess (16), an annular inner groove (18) positioned concentrically about the central well, and an annular outer groove (20) positioned concentrically about the inner groove. An annular plateau (28) is formed between the inner groove and the outer groove. A first reset ring (31) is positioned within the outer groove for rotational movement therein. The first reset ring includes two inwardly extending timing indicating tabs (32) and (33). A second reset ring (35) is positioned within the inner groove for rotational movement therein. The second reset ring includes two outwardly extending timing indicating tabs or indicators (36) and (37). A knob (43) coupled to a power switch (45) is positioned within the central well for rotational movement therein.
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