| 摘要 |
<p>A knock-type writing instrument is provided, which allows an easy refill exchange with a simple operation while inhibiting deformation of slits, breakage of a shaft tube, etc., during the refill exchange. SOLVING MEANS A knock-type writing instrument comprising: a shaft tube 1 having a long hole 1b; a refill 2 inserted into the shaft tube 1; a biasing member 3 biasing the refill 2 backward; a knock member 4 inserted into a back part of the shaft tube 1; a resilient piece 4e connected to the front end of the knock member 4 to extend backward and capable of resiliently deforming in a radial direction of the shaft tube 1; a lock protrusion 4f formed at the back end of the resilient piece 4e; and a clip 5 having a clip leg 5a connected to the resilient piece 4e to be slidably fitted in the long hole 1b, the clip having a front part compressed into contact with or approaching an outer circumference of the shaft tube 1, wherein a lock hole 1d connected to the back end of the long hole 1b via a middle slit 1c as well as a back slit 1e connected to the back end of the lock hole 1d to reach the back end of the shaft tube 1 are continuously formed on a back peripheral wall of the shaft tube 1 in an extension direction of the back end of the long hole 1b; and wherein the back end ridge 5c is formed at the back end of the clip leg 5a, the back end ridge sequentially widening the middle slit 1c and back slit 1e in their width directions by pushing out the clip 5 toward the back end of the shaft tube 1 with a pressure greater than a bias force of the biasing member 3.</p> |
