Writing element for use in ball point pen
OwnerJiro Horiinventor
Life of this patent
Estimating the term…
Abstract
Disclosed is a writing element for use in a ball point pen comprising a ball seat member which supports a ball on a ball seat disposed at its tip end and an outer sleeve which is fitted over the ball seat member to keep the ball on the ball seat. Said outer sleeve is slidably fitted to the ball seat member so as to be frictionally engaged with the ball seat member to be slid rearwardly by the extent to which the ball seat has been worn due to the writing pressure acting on the sleeve.
Claims12
A writing element for use in a ball point pen having a body member comprising a ball seat member fixed relative to said body member and having a ball seat on its tip-end, a ball rotatably supported on the ball seat, and an outer sleeve means surrounding said ball and having holding means keeping the ball on the ball seat of the ball seat member, the outer sleeve means being frictionally slidable relative to said body member so that writing pressure enables the outer sleeve means to move backward by the extent to which the ball seat has been abraded.
Dependencies are inferred from the claim text.