SOFT MEMBER ATTACHMENT STRUCTURE AND THERMOCHROMIC WRITING IMPLEMENT

摘要

This soft member attachment structure includes: an attachment hole 2 provided so as to pass along a vertical center axis through the rear end of a shaft tube constituting a thermochromic writing implement, the attachment hole having an inner peripheral surface between two openings positioned at the upper end and the lower end; an attachment part 5 positioned below a large-diameter part 4 of a soft member 3 that is used for heat discoloration, the attachment part 5 having a diameter that is less than that of the large-diameter part 4 and allows insertion into the attachment hole 2; a straight inner hole 31 provided along the vertical center axis of the soft member 3, the inner hole 31 opening at least at the lower end of the soft member 3; and a rod-form core 7 having an outside diameter that enables insertion into the inner hole 31, a length allowing fitting into the inner hole 31, and an outer peripheral surface that comes into contact with the inner peripheral surface of the inner hole 31. The attachment part 5 is inserted into the attachment hole 2 and the core 7 is inserted into the inner hole 31, whereby the soft member 3 is attached within the attachment hole 2.