The Sailor Pen Co., Ltd.

Yasuhiro Masumoto

Isao Shimada

An applicator in which the air within an inner barrel of a cap to the applicator is enabled to flow readily into the fluid tank of the applicator to increase the internal pressure of the fluid tank when the cap is engaged with the neck of the applicator, so that the fluid tank of the applicator need not be pressed between the fingers of a user for application of a highly viscous fluid. The inner barrel of the cap includes a curved, elastically deformable valve-opening member made of a highly flexible material bearing against the closed end of the cap. When the cap is engaged with the body of the applicator, the valve-opening member abuts against an application member to retract the application member from a caulked front edge of the tip of the applicator so as to form a clearance between the application member and the caulked front edge of the tip through which air can readily flow to increase the internal pressure of the fluid tank. When the cap is fully engaged with the neck of the applicator, the curved, elastically deformable valve-opening member deforms so as to close the clearance between the application member and the caulked front edge of the tip and to maintain the increased internal pressure of the fluid tank.

Applicator having cap which pressurizes and seals inner space

An inexpensive applicator in which the air within the inner barrel of a cap enters the fluid tank of the applicator to increase the internal pressure thereof in the process where the cap is engaged with the neck of the applicator, so that the fluid tank need not be pressed between the fingers for application of the fluid to be applied, the cap having in the inner barrel thereof a cylindrical valve member made of a highly flexible material and provided with a diaphragm or with a diaphragm having a ball-like portion formed thereon, and the application member being designed to be retracted and spaced from the caulked front edge of the tip when the application member is abutted against the diaphragm or the ball-like portion of the valve member in the process where the cap is engaged with the body of the applicator, whereas the elastically deformed diaphragm or the ball-like portion of the valve member is designed to close the front end opening of the tip when the cap is fully engaged with the neck.

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Tokyo, Japan

Yasuhiro Masumoto