Tombow Pencil Co., Ltd.

Shunichi Taniguchi

Kazunori Katami

Provided is a pressurized pen, which is enabled to enhance the sealing property of a compression chamber at a pressurizing time in the knocking operation of a knock mechanism and to improve the durability. A pressuring pump mechanism includes: a pressure member having a front end opening portion communicating with the inside of a medium containing tube and a compression chamber made extensible and contractible in axial direction; and a push member for coming in axial direction into and out of abutment against a rear end opening portion of the pressure member and for pushing the compression chamber of the pressure member in a gas-tight condition in a compressing direction. The push member is associated with the pushing action of a knock mechanism such that it is enabled to irrotationally move toward the rear end opening portion of the pressure member.

Pressurized pen

A pressurized pen having excellent feeling of using it by allowing an easy knocking operation with small force is disclosed. The pressurizing memberincludes an elastic cylindrical member. The elastic cylindrical memberhas a large-diameter front cylinder portion of which a front endin air-tight manner communicates directly with the rear opening portionof an ink containing tubeand which forms the pressurizing chamber, and a small-diameter rear cylinder portionwhich is coaxially connected to a rear end of the front cylinder portionand in which the front end portionof the pressing memberis pressed into a rear aperturethereof. The inside of the ink containing tubeis pressurized by allowing the pressing memberto press the rear cylinder portioninto the front cylinder portionand compressing the elastic cylindrical memberin the axial direction with the pressing chamberair-tight.

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Saitama, Japan

Shunichi Taniguchi