JP2008254378A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily retractably operating retractable writing utensil by a simple structure by a method wherein the movement of a hand towards a writing tip part is suppressed not only by fingers but also by parts between fingers under the condition that the holding part of a barrel is held. <P>SOLUTION: In the retractable writing utensil equipped with an extending and retracting mechanism, which can project the writing tip part of a writing utensil refill through the tip opening part of the barrel by thrusting a push-button under the condition that the writing utensil refill is arranged in the barrel so as to be energized towards the rear end of the barrel with a coiled spring and, at the same time, the push-button projectingly annexed from the rear end of the barrel is annexed to the rear end part of the barrel, the outer wall of the barrel is formed so inclinedly or circularly as to gradually reduce its diameter from the tip part of the barrel and gradually expand its diameter towards the near intermediate part of the barrel and, at the same time, is formed so inclinedly or circularly as to gradually reduce its diameter from the near intermediate part of the barrel and gradually expand its diameter towards the rear end part of the barrel, resulting in forming the swelling part at the tip part, the intermediate part and the rear part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a writing tool refill disposed in the shaft tube by being biased by a coil spring in the direction of the rear end of the shaft tube, and is provided at the rear end portion of the shaft tube so as to protrude from the rear end of the shaft tube. The present invention relates to a knock-type writing instrument provided with a retracting mechanism that allows a writing tip portion of the writing instrument refill to protrude and retract from a tip opening portion of a shaft tube by attaching a body and pressing the knocking body.

  Conventionally, a refill for a writing instrument is disposed in the shaft tube by being biased in the direction of the rear end of the shaft tube by a coil spring, and the knock body is provided at the rear end portion of the shaft tube so as to protrude from the rear end of the shaft tube. There is known a knock type writing instrument provided with a retracting mechanism capable of protruding and retracting the writing tip portion of the writing instrument refill from the tip opening portion of the shaft tube by pressing.

  In such a knock-type writing instrument, a writing instrument in which a grip member is attached to a shaft tube tip or a gripping part of the shaft tube tip and the tip of the grip member gradually increases in diameter toward the tip is disclosed in Japanese Patent Laid-Open No. 06-227195. No. “writing instrument” and Japanese Patent Application Laid-Open No. 08-330878 “writing instrument gripper”.

Further, a writing instrument that has a constricted shape in which the middle region has a smaller diameter than the front region and gradually increases in diameter from the front region toward the rear region is disclosed in Japanese Patent Application Laid-Open No. 2001-270281.
"Japanese Patent Laid-Open No. 06-227195" "Japanese Patent Laid-Open No. 08-330878" "JP 2001-270281 A"

  However, just as the tip of the grip member gradually increases in diameter toward the tip as in Patent Documents 1 and 2, when the grip member attached to the grip is gripped with a finger, Although the movement can be suppressed by the finger, the rear end portion of the shaft tube is difficult to contact the base of the thumb and the index finger (inter-finger part), and the backward movement of the inter-finger part cannot be suppressed.

  Further, as in Patent Document 3, a writing instrument that has a constricted shape in which the intermediate region has a smaller diameter than the front region and gradually increases in diameter from the front region toward the rear region is certainly a grip member attached to the grip portion. The rear end of the barrel is easy to come into contact with the base of the thumb and index finger (inter-finger part) when the finger is gripped with a finger, and the backward movement of the inter-finger part can be suppressed, but the inter-finger part, thumb, and index finger There is a problem that a space is easily formed between the finger and the finger, and the finger cannot be prevented from moving in the direction of the writing tip at the time of writing or the like.

  In view of these problems, the present invention suppresses the movement of the hand toward the writing tip portion by not only the fingers but also the inter-finger portion when gripping the grip portion of the shaft tube, and is a knock-type writing instrument that is easy to perform a knock operation. Is provided with a simple structure.

  The present invention provides a writing tool refill disposed in a shaft tube by being urged by a coil spring in the direction of the rear end of the shaft tube, and provided at the rear end portion of the shaft tube so as to protrude from the rear end of the shaft tube. In the knock type writing instrument provided with a protruding and retracting mechanism capable of projecting the writing tip portion of the writing instrument refill from the tip opening of the shaft tube by pressing the knock body, the outer wall of the shaft tube is The diameter is gradually reduced from the tip of the shaft tube, and is formed in an inclined shape or an arc shape gradually increasing toward the substantially middle portion of the shaft tube, and the diameter is gradually reduced from the substantially middle portion of the shaft tube. In addition, the shaft cylinder has an inclined shape or an arc shape that gradually increases in diameter toward the rear end portion, and a bulging portion is formed at the front end portion, the intermediate portion, and the rear end portion of the shaft tube.

  In addition, the outer shape of the shaft tube is substantially the same on the shaft tube tip end side and the shaft tube rear end side with respect to a substantially middle portion.

  Furthermore, the center of gravity of the knock-type writing instrument is characterized by being positioned at a substantially bulged portion.

  The present invention provides a knock-type writing instrument that suppresses the movement of the hand in the direction of the writing tip portion by not only the fingers but also the fingers when gripping the gripping portion of the shaft cylinder and is easy to perform the knocking operation. Could be provided in structure.

  Next, examples of the shaft cylinder of the writing instrument of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.

Example 1
The knock type writing instrument 1 according to the first embodiment shown in FIGS. 1 to 4 includes a front shaft 2 and an internal cylinder 4 that are detachably screwed together, and a transparent rear shaft 3 is attached so as to cover the internal cylinder 4. A tube body 5 is formed, and a tip member 5 formed by cutting brass at the front end portion of the front shaft 2 is detachably screwed, and a transparent portion molded in advance with silicone rubber on the grip portion of the front shaft 2. A grip member 5 is provided.

  In addition, the inner cylinder 4 is provided with a retracting mechanism comprising a rotating cam 11 formed of POM resin. This intruding mechanism is known in the art. Briefly, a cam groove (not shown) is formed on the inner wall surface of the inner body 4 for sliding and rotating the rotating cam 11 back and forth. A protrusion formed on the rotating cam 11 is engaged with the cam groove. At the rear end of the rotating cam 11, a push rod 10 having a cam portion for sliding the rotating cam 11 and imparting rotation is disposed, and a knocking body 8 is provided at the rear end thereof. It is a structure that is arranged in a state of projecting outward from the inner cylinder 4. Further, an opaque slip preventing member 7 is attached to the tip member 6, and an opaque knock body cover 9 is attached to the knock body 8.

  In front of the rotating cam 11, a ball pen refill having a ball pen tip 13 that rotatably holds a ball at the tip of an ink containing tube 12 that contains ink for writing instrument (not shown) is placed behind the coil spring 14. The ball 3 is slidably arranged by being biased toward the rear end of the shaft 3, and the ballpoint pen refill can be replaced by removing the tip member 6.

  In order to use the knock type writing instrument 1, the knocking body 8 is pressed to press the push rod 10, and the rotating cam 11 is further advanced along the cam groove (not shown). Thus, the rotary cam 11 can be rotated to allow the ball-point pen tip 13 to protrude from the tip opening 6a of the tip member 6 for use. When the knock body 8 is further pressed, the rotating cam 11 is rotated by the action of the cam portion of the push rod 10, and the rotating cam 11 is moved back along the cam groove (not shown) by the biasing force of the coil spring 14. 13 can be immersive.

  The grip member 5 has an outer wall formed in an arc shape that gradually decreases in diameter from the front end 5a and gradually increases in diameter toward the rear end 5b. Similarly, the outer wall of the rear shaft 3 also has an arc shape that gradually decreases in diameter from the rear end 3b of the rear shaft 3 and gradually increases in diameter toward the front end 3a. The bulging portions B2 and B3 are formed in the middle portion, and the bulging portion B4 is formed in the rear end portion.

  The tip of the grip member 5 has a shape that gradually increases in diameter toward the tip 5a, and the bulging portion B1 is formed at the tip of the shaft tube so that the finger can be pointed in the direction of the tip opening 6a of the tip member 6 during writing. Becomes difficult to move and easy to write.

  Further, the rear shaft 3 is gradually reduced in diameter from the rear end 3b and has an arc shape gradually increasing in diameter toward the front end 3a located at the middle portion of the main body of the main shaft. By forming the bulging part B3 in the middle part), it becomes difficult for the finger-to-finger part between the thumb and the index finger when gripping the shaft tube to move in the direction of the tip opening 6a of the mouthpiece member 6 during writing, Since the movement in the direction of the distal end opening 6a of the tip member 6 can be suppressed by both the finger and the inter-finger portion, the effect on the finger can be greatly reduced.

  In addition, the rear end portion of the grip member 5 has a shape that gradually increases in diameter toward the rear end 5b located at the intermediate portion of the shaft tube main body, and expands to the rear end portion (intermediate portion of the shaft tube) of the grip member 5. By forming the protruding portion B2, it becomes difficult for the finger when gripping the shaft tube during writing or the like to move toward the rear end 3b of the rear shaft 3, and the diameter of the rear shaft 3 is gradually reduced from the rear end 3b. By forming the shape and forming the bulging portion B4 at the rear end portion of the rear shaft 3, movement in the direction of the rear shaft rear end 3b can be suppressed by both the finger and the inter-finger portion.

  Furthermore, by forming the bulging portion B4 at the rear end portion of the rear shaft 3, it becomes difficult for the gripped finger to move in the direction of the knock body 8 when the rear shaft 3 is gripped and the knock body 8 is knocked. In addition to the effect of facilitating the knocking operation, when taking out the writing instrument stored in the pencil case, display case or the like, there is also an effect that it is hard to slip out and can be easily taken out by the bulging portions B1 and B4 at the end of the shaft tube or the rear end of the shaft tube.

  In the present embodiment, for convenience, the grip member is attached to the grip portion of the shaft tube, but the grip member may not be attached. However, elastically deformable silicone rubber, natural rubber, butyl rubber, fluorine rubber, vinyl chloride resin, butadiene rubber, urethane rubber, polyethylene resin, other synthetic rubbers, thermoplastic elastomers, etc. are generally known elastic bodies. It is most preferable to wear the grip member because a grip member appropriately selected from the above can be worn to reduce grip feeling and fatigue on the finger.

  In the shaft tube of the present invention, the outer wall of the grip portion of the shaft tube gradually decreases in diameter from the tip, gradually increases in diameter toward the substantially middle portion of the shaft tube, and the outer wall of the rear end portion of the shaft tube As long as the shape gradually decreases from the rear end of the tube and gradually increases toward the substantially middle part of the shaft tube, as in the embodiment, from a plurality of parts such as the front shaft, the rear shaft, and the grip member It may be configured or may be a single component. Although not shown, an attachment member such as a decorative ring may be interposed between the rear shaft and the grip member.

  In addition, by locating the center of gravity of the writing instrument in the substantially middle part of the barrel, when the gripper is gripped and written, the center of gravity is located between the gripped finger and the thumb and the index finger, and is stable. Can write. In addition, the shaft tube can attract the user's interest by making the outer shape of the shaft tube tip side and the shaft tube rear end side substantially the same with reference to the substantially middle portion, and the center of gravity of the writing instrument can be It is easy to position it at the substantially middle part of the tube.

  In the embodiment of the present invention, a retracting mechanism using a rotating cam is used for convenience. However, by pressing a knocking body that protrudes from the rear end of the shaft cylinder, the writing tip portion of the refill for the writing instrument is moved to the tip of the shaft cylinder. There is no particular limitation as long as it is an intrusion mechanism that can project from the opening.

  The knock-type writing instrument of the present invention can be widely implemented without being limited to the type of writing body such as a nib and ink.

It is a longitudinal cross-sectional view which shows the knock type writing instrument of this invention. FIG. 2 is an enlarged cross-sectional view of a tip portion of a shaft cylinder that is partially omitted in FIG. 1. FIG. 2 is an enlarged cross-sectional view of a rear end portion of a shaft cylinder that is partially omitted in FIG. 1. FIG. 2 is a partially omitted development view in FIG. 1. It is a figure which is an external view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Front shaft 2a Male thread part 3 Rear shaft 4 Inner trunk 5 Grip member 5a Front end surface 6 Mouth member 7 Non-slip member 8 Knock body 9 Knock body cover 10 Push rod 11 Rotating cam 12 Ink storage cylinder 13 Ball-point pen tip 14 Coil spring

Claims (3)

A writing instrument refill is urged and arranged in the shaft tube by a coil spring in the direction of the rear end of the shaft tube, and a knock body is provided at the rear end of the shaft tube so as to protrude from the rear end of the shaft tube. In the knock type writing instrument provided with a protruding and retracting mechanism capable of projecting the writing tip portion of the writing instrument refill from the tip opening of the shaft tube by pressing the knock body, the outer wall of the shaft tube is formed of the shaft tube. The diameter of the shaft cylinder is reduced gradually from the tip, and formed into an inclined or arc shape gradually increasing toward the substantially middle portion of the shaft cylinder, and gradually reduced from the substantially middle portion of the shaft cylinder. A knock-type writing instrument characterized by having an inclined or arcuate shape that gradually increases in diameter toward the rear end portion, and having a bulging portion formed at the front end portion, intermediate portion, and rear end portion of the shaft cylinder. The knock type writing instrument according to claim 1, wherein the outer shape of the shaft tube is substantially the same on the front end portion side and the rear end portion side of the shaft tube, with a substantially middle portion as a reference. The knock-type writing instrument according to claim 1 or 2, wherein a center of gravity of the knock-type writing instrument is located at a bulging portion at a substantially middle portion of the shaft cylinder.

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