| 摘要 |
A writing instrument has a tubular member (2,103) and a writing component (1,101) mounted in the tubular member (2,103). The tubular member (2,103) and the writing component (1,101) are movable relative to one another in axial directions along the longitudinal axis of the tubular member (2,103) between a writing position at which a writing tip (3,119) protrudes from an aperture (4,109) of the tubular member (2,103) and a housed position at which the writing tip (3,119) is disposed in the tubular member (2,103). An airtight sleeve (9,129) is connected to the end portion of the writing component (1,101) for movement between an advanced position and a retracted position. A cap plate (15,130) is pivotally connected to the airtight sleeve for opening and closing a bore (12,129a) of the airtight sleeve, and comprises a projecting rib (17,139) so that when the airtight sleeve moves to the retracted position the cap plate closes the bore. <IMAGE>
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