Pen with push-button

摘要

A pen with push button is a pen which has a button on its barrel to control the exposure or closure of its pen point. When the button is pressed down by a finger, a thimble will retract to expose the pen point; when it is released, the thimble will close the pen point. The pen has an extending and retracting mechanism composed of a thimble, a button, and a spring.