Writing instrument with movable closure and second sealing means
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 11, 1986
Grant Date -
N/A
app pub date -
Sep 6, 1983
filing date -
Sep 4, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A writing instrument comprises, an outer barrel unit (1); a slidable tube (27) housed in the outer barrel unit (1) and movable between a sealing position and an advanced position; an inner tube (16) housed in the slidable tube (27), the inner tube (16) having an opening (18) defined in a distal end thereof and being associated with the barrel unit (1); a writing unit (10) disposed in the inner tube (16) and having a writing tip (14) on a distal end thereof, the writing unit being axially movable among a retracted position, a writing position and a projected position; a first spring for biasing said writing unit rearwardly; a second spring for biasing the slidable unit rearwardly; a first sealing member for sealing said opening (18) of the inner tube (16), the first sealing member being pressable by an inner surface of a front end of the slidable tube (27) against the opening (18) of the inner tube (16) when the slidable tube (27) is in the sealing position; a second sealing member for sealing the writing tip (14) of the writing unit (10) together with the first sealing member, the second sealing member being located between the writing unit (10) and the inner tube (16); and a retaining means for retaining the writing unit (10) at the retracted position and the writing position.
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