JP2008307805A - Writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanical pencil designed so that even if a user writes by gripping a leading end portion, anti-slip effect is obtained and hence the user can write comfortably, a tip member 9 can be screwed with light force, insufficient screwing of the tip member 9 is prevented and torsion of a grip 8 is also prevented. <P>SOLUTION: An outer flange 9C is formed at the leading end of the tip member 9. An external projection 9D and an internal projection 9E are formed on the face of the rear end of the tip member 9. A tip cover 12 is fitted over the tip member 9. In addition, the grip 8 is fitted on the gripping part 7B of a shaft cylinder 7. Then, the tip member 9 is screwed onto the shaft cylinder 7, and the rear end of the front cover 12 is brought into firm contact with the internal end face 8A of the grip 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a writing instrument in which a grip is attached to a grip portion of a shaft tube and a tip cover is attached to a tip member.

Conventionally, the grip portion of the shaft tube is covered with the grip portion, and an anti-slip member (corresponding to the tip cover) having elasticity on the outer periphery of the base (corresponding to the tip member) is provided at a position away from the grip portion. Writing instruments are known. (See Patent Document 1)
There is also known a writing instrument in which the contact area between the rear end surface of the base (corresponding to the tip member) and the front end surface of the grip member is reduced to eliminate insufficient tightening of the base. (See Patent Document 2)
JP 2005-7584 A Japanese Patent Laid-Open No. 2002-21989

  However, in the writing instrument described in Patent Document 1, since the anti-slip member and the grip portion are separated from each other, if the finger comes into contact with the separated portion, the finger feels a difference in unevenness or material and is very difficult to grasp. It was a thing.

  Further, the writing instrument described in Patent Document 2 does not have a tip cover that is mounted so as to cover the base, and when the tip member is gripped and written, an anti-slip effect cannot be expected.

  Furthermore, when the front cover is simply attached to the front member and the rear end of the front cover and the front end of the grip are brought into contact, the rear end of the front cover and the front end of the grip are pressed against each other, resulting in insufficient tightening of the base. Then there was a problem that the grip was twisted.

  In order to solve the above problems, the present invention eliminates insufficient tightening of the front member even when a front cover made of an elastic body is attached to the front member and the rear end of the front cover contacts the front end of the grip. An object of the present invention is to provide a writing instrument that does not fear that the grip is twisted.

  The present invention relates to a shaft tube, a tip member that is detachably screwed to the front portion of the shaft tube, a tip cover that is made of an elastic body and is mounted so as to cover the tip member, and a gripping of the shaft tube that is made of an elastic body. A writing instrument comprising a grip attached to the front part, the front cover being reduced in diameter toward the front, the front end of the grip being brought into contact with the rear end of the front cover, and an outer collar formed at the rear end of the front member The first gist is that an outer protrusion protruding rearward is formed on the rear end surface of the tip member, and the outer protrusion is pressed against the inner end surface of the grip.

  Further, the shaft tube, a tip member that is detachably screwed to the front portion of the shaft tube, a tip cover that is made of an elastic body and is mounted so as to cover the tip member, and a gripping portion of the shaft tube that is made of an elastic body A writing instrument comprising a grip to be attached, forming an outer collar at the rear end of the tip member, forming an outer protrusion protruding rearward on the rear end surface of the tip member, and bringing the tip cover forward And the rear end of the front cover protrudes rearward from the outer protrusion of the front member, the outer protrusion of the front member is pressed against the front end surface of the grip, and the front cover A second aspect is that the rear end of the rear end is in contact with the front end surface of the grip.

  Further, the front cover is formed with a front inner collar and a rear inner collar, the front member is formed with a front groove and a rear groove, and the front inner groove of the front cover is engaged with the front groove of the front member. The third aspect is that the rear inner flange of the front cover is engaged with the rear concave groove of the front member.

  According to the first and second aspects of the present invention, the front cover is attached to the front member, and the rear end of the front cover and the front end of the grip are in contact with each other. The effect is obtained and comfortable writing is performed. Further, by forming an outer flange on the tip member, the contact area between the tip cover and the grip is reduced, and the contact area between the tip member and the grip is reduced by the outer protrusion of the tip member, so that the tip member is screwed with a light force. This eliminates the insufficient tightening of the tip member and eliminates the worry of twisting the grip.

  According to the third aspect of the present invention, when the tip cover is gripped and written, the tip cover is firmly attached to the tip member, so that there is no possibility of the tip cover being detached forward.

  A writing instrument is realized in which the tip cover and grip attached to the tip member can be brought into contact with each other, and the tip member can be screwed into the shaft tube with a light force.

  In the first embodiment shown in FIG. 1, the writing instrument is described with a swing-out mechanical pencil. In addition, let the left side of FIG. 1 be the front, and let the right side be the back. First, a polyacetal connector 2 is press-fitted and fixed to the rear part of a metal chuck 1 made of brass or the like. The connector 2 is formed with a flange portion 2A at a substantially middle portion and two outer flanges 2B with a front surface vertical and a rear surface inclined at a rear portion. The rear part of the connector 2 is press-fitted and fixed to the front part of the core tank 3 made of polypropylene pipe material.

  Further, a fastener 4 is fitted on the head 1 </ b> A of the chuck 1, and a spring 6 is stretched between the connector 5 that receives the fastener 4 and the connector 2.

  A small-diameter hole 7A is formed in the front portion of the shaft cylinder 7, and the core tank 3 and the connector 2 can be inserted into the small-diameter hole 7A. A grip 8 for preventing slipping is attached to the grip portion 7B of the shaft cylinder 7, and the grip 8 is made of an elastic body such as silicon rubber. The grip 8 is slightly cut off from the front end to form an inner end face 8A. Moreover, the outer shape of the grip 8 is formed in an arc shape that gradually decreases in diameter from the front end and gradually increases in diameter toward the rear end.

  The tip member 9 has a built-in lead holder 11 made of an elastic body such as rubber that holds the lead 10 with an appropriate force, and the tip member 9 has a substantially conical shape whose diameter decreases toward the front. Is formed. Moreover, a front locking groove 9 </ b> A and a rear locking groove 9 </ b> B for mounting the front cover 12 are formed on the outer peripheral surface of the front member 9. Further, an outer collar 9C is formed at the rear end of the front member 9, and an outer projection 9D and an inner projection 9E projecting rearward are formed on the rear end surface of the outer collar 9C. The area is reduced.

  The front cover 12 is formed of the same elastic body as the grip 8 described above, and is mounted so as to cover almost the entire outer peripheral surface excluding the front end portion of the front member 9. The front cover 12 is reduced in diameter toward the front, and a front inner collar 12A is formed at the front end, and a rear inner collar 12B is formed at the rear end. The front inner flange 12A of the front cover 12 is engaged with the front locking groove 9A of the front member 9, and the rear inner flange 12B of the front cover 12 is engaged with the rear locking groove 9B of the front member 9. Yes.

  The core tank 3 is inserted from the front side of the shaft tube 7 and the tip member 9 is detachably screwed to the front portion of the shaft tube 7. The above-described connector 5 is held by the front end of the shaft cylinder 7 and the inner stage 9F of the tip member 9. Further, since the outer protrusion 9D and the inner protrusion 9E are formed on the rear end surface of the tip member 9, when the tip member 9 is screwed, the inner protrusion 9E contacts the step 7C of the shaft tube 7. Thus, the screwing of the tip member 9 is stopped. In addition, since the outer protrusion 9D of the tip member 9 contacts the inner end face 8A of the grip 8, the contact area between the tip member 9 and the grip 8 is reduced. Further, since the outer flange 9C is formed at the rear end of the tip member 9, the contact area between the rear end of the front cover 12 and the front end of the grip 8 becomes very small due to the outer flange 9C. Therefore, the contact area between the rear end of the front cover 12 and the front end of the grip 8 and the outer protrusion 9D of the front member 9 and the inner end surface 8A of the grip 8 is extremely small, so that the front member 9 is screwed into the shaft cylinder 7. The frictional resistance between the tip member 9 and the tip cover 12 and the grip 8 is small, and the tip member 9 can be screwed together with a light force. Therefore, there is no shortage of tightening of the tip member 9, and there is no risk of the grip 8 being twisted. Further, when writing, not only the grip 8 portion but also the tip cover 12 is held and written, an anti-slip effect can be expected.

  The metal weight body 13 is formed in a cylindrical shape, and the weight body 13 is slidably incorporated in an inner hole 7D opened from the rear end of the shaft cylinder 7. The core tank 3 is inserted into the through hole of the weight body 13.

  The swing-out mechanical pencil described above is written by holding the grip 8 or the tip cover 12 with a finger. Further, when the shaft cylinder 7 is shaken to feed the core 10, an inertial force acts on the weight body 13, and the weight body 13 comes into contact with the flange portion 2 </ b> A of the connector 2. Then, the chuck 1 and the lead tank 3 are moved forward together with the connector 2 to feed the lead 10 by a predetermined amount.

  Further, when a broken core is generated in the tip member 9, the tip member 9 is removed and the broken core is removed. Thereafter, the tip member 9 is screwed into the shaft cylinder 7. Therefore, in the case of a mechanical pencil, since the tip member 9 is frequently attached and detached, it is particularly preferable that the tip member 9 can be screwed with a light force.

  In the second embodiment shown in FIG. 2, the writing instrument is described with a swing-out mechanical pencil as in the first embodiment. The same members as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  The anti-slip grip 108 attached to the grip portion 7B of the shaft cylinder 7 has a flat front end surface 108B.

  Further, the front cover 112 is formed of the same elastic body as the above-described grip 108 and is formed with a reduced diameter toward the front. Furthermore, a front inner collar 112A is formed at the front end of the front cover 112, and a rear inner collar 112B is formed at the rear. Further, the front cover 112 is formed with a rear end portion 112C that protrudes rearward from the rear inner collar 112B.

  The front cover 112 is mounted so as to cover substantially the entire outer peripheral surface excluding the front end of the front member 9, and the front inner collar 112A is engaged with the front locking groove 9A and the rear inner collar 112B is rear. It is engaged with the locking groove 9B. Further, the rear end portion 112C of the front cover 112 covers the outer flange 9C portion of the front member 9, and slightly protrudes rearward from the outer protrusion 9D.

  The tip member 9 is detachably screwed to the front portion of the shaft tube 7, and the connector 5 is held by the front end of the shaft tube 7 and the inner stage 9 </ b> F of the tip member 9. Further, since the outer protrusion 9D and the inner protrusion 9E are formed on the rear end surface of the tip member 9, when the tip member 9 is screwed, the inner protrusion 9E contacts the step 7C of the shaft tube 7. Thus, the screwing of the tip member 9 is stopped. Further, since the outer protrusion 9D of the tip member 9 contacts the front end surface 108B of the grip 108, the contact area between the tip member 9 and the grip 108 is reduced. Further, since the outer flange 9C is formed at the rear end of the tip member 9, the contact area between the rear end of the front cover 112 and the front end face 108B of the grip 108 becomes very small due to the outer flange 9C.

  When the contact area between the rear end of the front cover 112 and the front end surface 108B of the grip 108 and the outer protrusion 9D of the front member 9 and the front end surface 108B of the grip 108 becomes extremely small, the front member 9 is screwed into the shaft cylinder 7. The frictional resistance between the tip member 9 and the tip cover 112 and the grip 108 is reduced, and the tip member 9 can be screwed together with a light force. Accordingly, there is no shortage of tightening of the tip member 9, and there is no risk of the grip 108 being twisted. Further, when writing, not only the grip 108 part but also the tip cover 112 is held and writing is expected.

  In addition, this invention is not limited to the said Example, As a writing instrument, besides a swing-out type mechanical pencil, it can utilize for a knock-type mechanical pencil, a knock-type ball-point pen, etc. In addition, the shaft tube may be integrally formed by screwing or fitting two or more parts such as a trunk and a sheath. Furthermore, as means for stopping the screwing of the tip member, the inner step of the tip member may be brought into contact with the connecting tool in addition to the inner projecting portion of the tip member being brought into contact with the step portion of the shaft tube.

  The present invention can be applied to a writing instrument that can provide an anti-slip effect even when the tip portion is gripped.

It is principal part sectional drawing which shows the writing instrument of Example 1 of this invention. Example 1 It is principal part sectional drawing which shows the writing instrument of Example 2 of this invention. (Example 2)

Explanation of symbols

7 Axle cylinder 7B Gripping part of axle cylinder 7C Stepped part of axle cylinder 7 8 Grip 8A Inner end face of grip 8 9 Tip member 9C Outer collar of tip member 9 9D Outer projection of tip member 9 9E Inside projection of tip member 9 Part 12 Front cover 108 Grip 108B Front end surface of the grip 108

Claims (3)

  A shaft tube, a tip member that is detachably screwed to the front portion of the shaft tube, a tip cover that is made of an elastic body and is attached to cover the tip member, and is made of an elastic body and is attached to a grip portion of the shaft tube. A writing instrument comprising a grip, wherein the front cover is reduced in diameter toward the front, the front end of the grip is brought into contact with the rear end of the front cover, and an outer collar is formed at the rear end of the front member. A writing instrument characterized in that an outer protrusion projecting rearward is formed on the rear end face, and the outer protrusion is pressed against the inner end face of the grip.   A shaft tube, a tip member that is detachably screwed to the front portion of the shaft tube, a tip cover that is made of an elastic body and is attached to cover the tip member, and is made of an elastic body and is attached to a grip portion of the shaft tube. A writing instrument comprising a grip, wherein an outer ridge is formed at the rear end of the tip member, an outer protrusion projecting rearward is formed on the rear end surface of the tip member, and the tip cover is directed forward. In addition to reducing the diameter, the rear end of the front cover protrudes rearward from the outer protrusion of the front member, and the outer protrusion of the front member is pressed against the front end surface of the grip. Writing instrument, characterized in that the end is in contact with the front end face of the grip.   Forming a front inner collar and a rear inner collar on the front cover, forming a front concave groove and a rear concave groove on the front member, engaging the front inner flange of the front cover with the front concave groove of the front member; and The writing instrument according to claim 1, wherein a rear inner flange of the front cover is engaged with a rear concave groove of the front member.

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