Patent ID: 8434957
Filing Date: 2013-05-07
Classification: B43K

Abstract:
1. A knock-type writing instrument comprising: a shaft tube formed in a peripheral wall of a back part thereof with an axially extending long hole, a lock hole continuously connected to a back end of the long hole by a middle slit, and a back slit continuously extending to an edge of a back end of the shaft tube from a back end of the lock hole and opened backward; the long hole having a first width, the lock hole having a second width substantially equal to the first width, the middle slit having a third width smaller than each of the first and second widths, and the back slit having a fourth width substantially equal to the third width; a refill having a writing part provided at a front end thereof and inserted into the shaft tube from the back end of the shaft tube; a biasing member provided in the shaft tube for biasing the refill backward; a knock member having a resilient piece capable of resiliently deforming in a radial direction of the shaft tube, the resilient piece being connected to a front end of the knock member and extending backward, and a lock protrusion formed on a back end of the resilient piece; and a clip having a clip leg which extends orthogonally to the clip and is connected between the clip and the resilient piece of the knock member, so that the clip is integrated with the knock member via the clip leg; the knock member integrated with the clip being mounted with respect to the shaft tube in such a manner that the knock member is slidably inserted in the back part of the shaft tube with the front end thereof being abutted on a back end of the refill, with the lock protrusion thereof being releasably engaged with the back end of the lock hole, and with the back end thereof being protruded backward from the back end of the shaft tube, and the clip is arranged laterally of the shaft tube with the clip leg thereof being slidably fitted through the long hole of the shaft tube; wherein the clip leg is provided at a back end thereof with a back ridge for facilitating sequential widening of the middle and back slits in width directions of the middle and black slits when the clip is pushed in a backward direction of the shaft tube in order that the knock member integrated with the clip is removed from the back end of the shaft tube, said back ridge being formed in a wedge-shape in cross-section.