| 摘要 |
The disclosed retractable brush comprises a casing made of a resilient plastic material and having generally cup shaped front and rear members which are relatively rotatable, said front member having a front wall and an annular generally cylindrical side wall projecting rearwardly therefrom, said front wall having a plurality of bristle receiving openings therein, said rear member having a rear wall with an annular generally cylindrical side wall projecting forwardly therefrom, a bristle carrying member movable in said casing and having bristles movable outwardly and retractable rearwardly through said openings, and operating means in said casing for advancing and retracting said bristle carrying member in response to relative rotation of said front and rear members in opposite directions, said annular side wall of said front member having an internal inwardly projecting annular lip thereon and an internal annular groove therein immediately in front of said annular lip, said annular side wall of said rear member having an external annular lip projecting outwardly therefrom and slidably received in said internal groove, said internal annular lip interlocking with said external annular lip and slidably engaging said annular side wall of said rear member immediately to the rear of said external annular lip, said internal and external annular lips overlapping substantially when assembled and being dimensioned for assembly by snapping together under heavy manual pressure, said annular lips and said annular groove interlocking with a snug sliding fit therebetween and without any looseness for largely obviating any accidental disconnection of said internal and external annular lips due to gripping pressure on said casing.
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