Ancos Co., Ltd.

Kazuo Shimizu

Yasuyuki Hashimoto

A writing instrument comprises a barrel having a front opening (216), a writing member (217) having a writing tip (220) on a front end thereof and disposed in the barrel for back-and-forth movement therein, a mechanism disposed between said barrel and the writing member (217) for locking the writing member (217) in an advanced position and returning the writing member (217) in a retracted position, a sealing body (206) pivotable about a single point in the vicinity of the opening (216) for opening and closing the writing tip (220), bias spring (213) disposed between the sealing body (206) and the barrel for normally urging the sealing body (206) to seal the writing tip (216), the writing member (217) pushing aside the sealing body (206) to release the writing tip against a force tending to seal the latter, the writing tip (220) being prevented from contacting the sealing body (206) when the writing member (217) advances, and a seal member for providing a seal between the barrel and the writing member (217) at a position behind the sealing body (216).

Writing instrument with sealing cap and additional rearward seal

A writing instrument comprises, an outer barrel unit (1); a slidable tube (27) housed in the outer barrel unit (1) and movable between a sealing position and an advanced position; an inner tube (16) housed in the slidable tube (27), the inner tube (16) having an opening (18) defined in a distal end thereof and being associated with the barrel unit (1); a writing unit (10) disposed in the inner tube (16) and having a writing tip (14) on a distal end thereof, the writing unit being axially movable among a retracted position, a writing position and a projected position; a first spring for biasing said writing unit rearwardly; a second spring for biasing the slidable unit rearwardly; a first sealing member for sealing said opening (18) of the inner tube (16), the first sealing member being pressable by an inner surface of a front end of the slidable tube (27) against the opening (18) of the inner tube (16) when the slidable tube (27) is in the sealing position; a second sealing member for sealing the writing tip (14) of the writing unit (10) together with the first sealing member, the second sealing member being located between the writing unit (10) and the inner tube (16); and a retaining means for retaining the writing unit (10) at the retracted position and the writing position.

Writing instrument with movable closure and second sealing means

A mechanical pencil comprising a pencil barrel, a cam cylinder mounted in the pencil barrel at a front portion thereof and having a cam wall formed on an inner circumferential surface, a cylindrical slide cam engaged with the cam wall for back-and-forth movement therein, a rotatable cam disposed in front of the slide cam and having a central hole, an inner fitting and a clamp support connected together and disposed in front of the rotatable cam, a pusher for pushing the slide cam, a spring for urging the inner fitting and the clamp support to move backwardly, the inner fitting, a lead holder mounted in the inner fitting for holding a lead with a light force, a cylindrical clamp disposed behind the lead holder and movable back and forth by a slight interval, a chuck fitted in the clamp, a lead pipe connected to a rear end of the chuck and having a diameter small enough to allow passage therethrough of one lead at a time, the lead pipe extending through the rotatable cam and the slide cam, a lead casing connected to a rear end of the lead pipe, another spring for urging the interconnected chuck, lead pipe and lead casing to move backwardly, and a stop portion for preventing the chuck, the lead pipe and the lead casing from being retracted beyond a certain interval.

Mechanical pencil with self-contained insert

A writing instrument such as a ball point or felt tip pen is provided with a seal member selectively engageable with the writing tip, the sealing member being movable from a position plugging the pen through hole to a position allowing the front end of the writing member to freely pass through the through hole for writing.

Writing instrument with sealing cap retained in tip

Writing instrument with sealing tip

A mechanical pencil including a main body divided into first and second members which are rotatable relative to one another. An inner mechanism is provided, primarily in the first member of the body, including a chuck for gripping leads, a chuck tightening member for tightening the chuck disposed around the chuck, a chuck tightening member receiver, and a lead case coupled at a front end portion to the chuck. In a preferred embodiment, a push member is coupled at a front end to the lead case while a spring biases the inner mechanism rearwardly. A mechanism is provided for converting the relative rotation of the first and second members to axial movement of the inner mechanism between retracted and writing positions.

Growing community of inventors

Osaka, Japan

Kazuo Shimizu