Knock-type writing instrument having a shock-relaxing device

Abstract

Upon depressing a knock rod in a state of writing of FIG.A, a cam protuberanceof a rotor turns rightward to assume a position shown in FIG.B. Upon removing a finger, the cam protuberanceturns sliding on a tilted surface, arrives at a position shown in FIG.C through a first vertical motion (distance d) and, further, arrives at a position shown in FIG.D through a second vertical motion (distance e). Here, a tilted surface of cam protuberancecomes in collision with a tilted surface of an inner cylinder camtwice, and shocks are transmitted to a refillBy forming a step between the front half and the rear half of the tilted surface of the inner cylinder camhowever, a distance of vertical motion of the cam protuberanceeach time is shortened to decrease the shock of collision imparted to the refill each time.