Sakura Color Products Corporation

Kabushiki Kaisha Sakura Kurepasu

Tatsuya Ozu

Shigeyasu Inoue

Yasunori Nakatani

Masahiro Yasunaga

Hiroyoshi Yamamoto

Molded resin article and ink applicators such as ball-point pens

An applicator with improved safety is provided. Even if the penpoint tip of the applicator has ignited, fire cannot spread over the tip holder. The applicator comprises a main body ( ) forming a reservoir to accommodate an occluding body ( ) to occlude flammable liquid to be applied, penpoint tips ( ), and tip holders ( ). Each of the tip holders ( ) is made of flame-retardant resin having an oxygen index more than 30 percent.

Applicator

Cap for a writing instrument

An applicator that makes it unlikely for an ink, particularly water-based or alcohol solvent ink, to become blurred and assures smooth writing, including an ink reservoir accommodating an ink, a penpoint tip for ink application, and a valve mechanism, wherein the valve mechanism has an axially movable valve body, a valve seat situated on the side of the ink reservoir with respect to the valve body, and a valve support situated on the side of the tip with respect to the valve body; the valve support can anchor the valve body and has an interstice between it and the valve body through which the ink passes; when the tip is disposed upward, the valve body contacts the valve seat to prevent backflow of ink from the tip toward the ink reservoir; and when the tip is disposed downward, the valve body contacts the valve support, allowing the ink to flow through the interstice toward the tip; characterized in that a portion of the valve body that contacts the valve support is formed spherical, and the projected area of the interstice not covered by the valve body produced by projecting the valve body and the interstice onto a plane perpendicular to the axis is 0.035 mm,or more.

Ink applicator, ink backflow prevention mechanism of ink applicator, and a pen tip

A writing implement includes a valve device provided at a specified position along a liquid passage along which liquid to be applied flows. The valve device has a ball valve member, a chamber portion in which the ball valve member is placed, the chamber portion having a cross-section in the form of a non-circular substantially circumscribing the ball valve member, a sealing portion operable to come to contact with the ball valve member entirely along a circumference of the ball valve member to interrupt the flow of liquid, and a restricting portion operable to come to contact with a circumferential portion of the ball valve member to restrict the movement of the ball valve member toward a leading end of the writing implement.

Writing implement and a fabricating method thereof

A hollow inner cylinder is provided in a lead end portion of a casing, and a pen shaft is inserted into the inner cylinder. The inner cylinder is connected to the casing through a partition wall having communication holes formed herein. In an annular space defined between the inner cylinder and the casing and located below the partition wall is filled an impregnation receptacle holding a dry preventing agent for preventing a nib from getting dried. The liquid applicator thus constructed is capable of effectively suppressing the drying of the nib without affecting the performance of liquid to be applied.

Liquid applicator with drying prevention agent

A writing implement having a sleeve formed with a bore extending therethrough axially of the implement, a barrel inserted in the bore of the sleeve and retractably projectable forward from the forward end of the sleeve, and a closure so shaped as to close the forward end opening of the sleeve bore. At least the forward end portion of the sleeve and the closure are made of a magnetic material, and at least one of the sleeve forward end portion and the closure is formed by a magnet so as to attract the other. The closure is connected to the sleeve by a connecting member made of an elastic material so as to be movable between a position where the closure closes the forward end opening of the sleeve bore and a position where the closure opens the forward end opening to permit the barrel to project forward. The closure is biased by the connecting member toward the sleeve to a position where the closure is attractable by the sleeve.

Writing inplement with magnetic closure

A device for preventing drying of ink in a writing instrument, in particular, a writing instrument provided with a tubular holder made of synthetic resin. The writing instrument is internally provided with a tubular ink-cartridge containing ink and a liquid retainer impregnated with liquid whose vapor pressure is higher than that of the liquid in the ink in the ink-cartridge, provided in an inner space of the holder so as to control evaporation of ink from the cartridge by the use of vapor evaporating from the impregnated retainer.

Growing community of inventors

Kadoma, Japan

Tatsuya Ozu