| 摘要 |
A cap assembly of a writing brush comprises a cap having a top opening, first and second circumferential recesses located below and adjacent to the top opening; and a collapsable sleeve having first and second end holes with first and second circumferential projections formed therearound respectively. The first projection is engaged with the first recess and the second projection is engaged with the second recess for permitting the point of the writing brush to insert into the cap in a first position. The second projection is extended toward the opening until covering and securing around handle of the writing brush for sealing the point of the writing brush within the cap and the sleeve in a second position.
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