Patent ID: 9126454
Filing Date: 2015-09-08
Classification: B43K

Abstract:
1. A slim type ballpoint pen comprising: a shaft tube having a cap secured to a forward end thereof, a refill having a pipe storing ink therein and a pen tip housed in the tube for movement in forward and reverse directions, an arrangement for moving the pen tip in the forward and reverse directions, the arrangement including a knock part and a backward elastic force of a spring, respectively, the pipe storing ink along a longitudinal direction of the shaft tube and the knock part being movable in the forward and reverse directions and being fitted at a rear end of the shaft tube, and the spring is elastically fixed between a rear end of the cap and a spring stopper fixed to a rear end of the refill; a front hole and a rear slit are continuously provided, in the shaft tube, behind the spring stopper, an insertion hole is projected downward in the knock part, and a button to be inserted into the insertion hole includes an upper body part, a middle body part and a lower body part, the upper body part having a diameter adapted to pass upward through the front hole, the rear slit and the insertion hole, the middle body part having a diameter adapted to pass upward through the front hole and the insertion hole and not passing upward through the rear slit, the lower body part having a diameter adapted to pass upward through the insertion hole and not passing upward through either the front hole or the rear slit, the lower body part is supported from a lower side and adapted to be powered upward by a vertical spring, and a lower end of the vertical spring is supported on one of: wherein in a writing state, the middle body part projects upward to contact a rear end of the front hole, and the lower body part projects upward from the insertion hole to contact a front end of an inner wall of the insertion hole; wherein in a not-writing state, the upper body part projects upward to contact a rear end of the rear slit, and the front end of the inner wall of the insertion hole contacts with the lower body part; and wherein the length of the knock part in a forward and reverse direction is set so that a rear end of the knock part projects backward more than the rear end of the shaft tube.