JP4530403B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument in which an inner sheath is detachably attached to a trunk or an annulus and the sheath is held by the trunk or an annulus and the inner sheath.

2. Description of the Related Art Conventionally, a writing instrument is known in which an inner sheath is attached to a sheath and the sheath is attached to the trunk. (See Patent Document 1)
Japanese Utility Model Publication No. 50-6442 (Fig. 1)

  The problem to be solved is that the inner sheath is bonded to the sheath, and the manufacturing process is complicated and expensive. Further, a writing instrument is conceivable in which the inner sheath is covered with the sheath and the inner sheath is screwed onto the barrel so that the sheath is held between the barrel and the inner sheath. However, this writing instrument was very troublesome because the sheath was removed from the inner sheath when the inner sheath was removed from the body in order to replace the refill of the ballpoint pen or correct the malfunction of the mechanical pencil.

  The present invention relates to a writing instrument in which an inner sheath is detachably attached to a body and the sheath is held by the body and the inner sheath. An inner collar is formed at the rear of the sheath and a groove extending in the longitudinal direction is formed in the inner collar. The outer sheath is formed at the rear portion of the inner sheath and a protrusion extending in the longitudinal direction from the outer sheath is formed. The locking portion having a slightly wider width than the concave groove of the sheath is formed at the front portion of the protrusion. When the inner collar is inserted into the sheath, the inner sheath locking portion is detachably press-fitted into the concave groove of the sheath and attached, and the trunk is screwed into the front portion of the inner sheath to thereby fit the trunk and the inner sheath. The first gist is that the sheath is held and attached.

Further, in a writing instrument in which an inner sheath is detachably attached to a metal ring attached to the body and the sheath is held by the metal ring and the inner sheath, an inner collar is formed at the rear part of the sheath and a concave extending in the longitudinal direction is formed on the inner collar. A groove is formed, an outer casing is formed at the rear part of the inner sheath, and a protrusion extending forward in the longitudinal direction from the outer casing is formed, and a locking part slightly wider than the concave groove of the sheath is formed at the front part of the protruding part. When the inner sheath is inserted into the sheath, the locking portion of the inner sheath is detachably press-fitted and attached to the groove of the sheath, and the annulus is screwed into the front portion of the inner sheath. The second gist is that the sheath is held and attached by the inner sheath.

  Furthermore, the third gist is that the sheath is configured to be transparent or colored and the inner sheath positioned inside the sheath is visible.

  Furthermore, the concave groove formed in the sheath is formed so as to become narrower as it goes forward in the longitudinal direction, and both sides of the locking portion formed in the protrusion of the inner sheath are curved and formed in a curved shape. This is the fourth gist.

  The writing instrument of the present invention is not easily detached from the inner sheath when the inner sheath is removed from the body in order to change the refill of the ballpoint pen or remove the mechanical pencil working member, and easily when attaching the sheath to the inner sheath. There is an advantage that can be attached. Further, the rotation of the inner sheath and the sheath can be prevented and the positioning of the sheath can be performed only by inserting the inner sheath into the sheath, which has the advantage of greatly improving productivity.

  By inserting the protrusion of the inner sheath into the concave groove of the sheath and detachably engaging the locking portion of the inner sheath with the concave groove of the sheath, the sheath will be detached from the inner sheath even if the inner sheath is removed from the trunk. It was difficult to achieve, and a writing instrument that could easily lock the inner sheath and sheath and position the sheath was realized.

  A first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3 and 4. FIG. The writing instrument will be described with a swing-out mechanical pencil. Also, the left side of FIG. 2 is the front and the right side is the rear. 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 rear portion of the connector 2 is press-fitted and fixed to the front portion of the core tank 3 made of polypropylene pipe material, and the flange portion 2A of the connector 2 contacts the front portion of the core tank 3. Further, a fastening ring 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 fastening ring 4 and the connector 2.

  Next, the cylinder 7 will be described. The core tank 3 and the connector 2 can be inserted through the front hole 7A of the cylinder 7. Further, an anti-slip rubber grip 8 is externally fitted to the front narrow diameter portion 7B of the body 7. The rubber grip 8 is configured to be translucent and configured to be visible inside.

  The transparent resin sheath 9 is integrally formed with a clip 10, and an inner collar 9 </ b> A is formed at the rear portion of the sheath 9. Further, a concave groove 9B extending in the longitudinal direction is formed in the inner flange 9A. The concave groove 9B is formed to become narrower as it goes forward in the longitudinal direction. Further, an outer collar 11A is formed at the rear part of the inner sheath 11, and a protrusion 11B extending in the longitudinal direction from the outer casing 11A is formed, and a locking part in which both sides are curved in a curved shape at the front part of the protrusion 11B. 11C is formed. The maximum width of the locking portion 11C is appropriately thicker than the minimum width of the concave groove 9B of the sheath 9. Furthermore, on the inner surface of the inner sheath 11, an inner collar 11D is formed slightly rearward from the middle portion, and two front keyways 11E extending in the longitudinal direction rearward from the front end are formed opposite to each other, Two rear key grooves 11F extending in the longitudinal direction from the rear end are formed opposite to each other.

  The core 12 has an inner collar 12A formed at the front portion, and an opening window 12B formed at a position opposite to the intermediate portion. Further, two keys 12C are formed on the outer surface of the core 12 at relative positions.

  Two protrusions 13A are formed at relative positions above and below the front outer surface of the eraser support 13, and the front ends of the protrusions 13A are inclined. Moreover, the opening window 13B is formed in the both sides of the eraser support 13, and the front part of the eraser support 13 is formed so that bending is possible. An outer casing 13C is formed at the rear portion of the eraser support 13, and two keys 13D protruding outward are formed on the outer casing 13C so as to face each other. Further, an eraser 14 is fitted and attached to the rear inner hole 13E of the eraser support 13, and a knob 15 covering the eraser 14 is fitted to the rear outer surface 13F of the eraser support 13.

  The core 12 is inserted from the front of the inner sheath 11 with the key 12C of the core 12 aligned with the front keyway 11E of the inner sheath 11. Further, an eraser support 13 is inserted into the rear key groove 11F of the inner sheath 11 from the rear of the inner sheath 11 with the key 13D of the eraser support 13 being aligned, and the inner collar 11D of the inner sheath 11 and the outer collar 13C of the eraser support 13 are inserted. A return spring 16 is stretched between them. When the eraser support 13 is appropriately inserted, the protrusion 13A of the eraser support 13 is engaged with and attached to the opening window 12B of the core 12. At this time, the key 12C of the core 12 is fitted to the front keyway 11E of the inner sheath 11, and the key 13D of the eraser support 13 is fitted to the rear keyway 11F of the inner sheath 11, so that the projection 13A of the eraser support 13 is It fits securely into the opening window 12B of the core 12.

  The inner sheath 11 is inserted into the sheath 9 from the rear. At this time, first, a locking portion 11C formed on the protrusion 11B of the inner sheath 11 is press-fitted into the concave groove 9B of the sheath 9. At this time, since the concave groove 9B of the sheath 9 has a large width at the rear, the engaging portion 11C is smoothly press-fitted into the concave groove 9B. In addition, since this latching | locking part 11C can be removed if it pulls back with a strong force, a user can affix an arbitrary seal | sticker on the surface of the inner sheath 11, and sees through the transparent sheath 9 visually. Can do. Further, the inner sheath 11 and the sheath 9 are prevented from being rotated and aligned by the protrusion 11B being engaged with the concave groove 9B.

  The core tank 3 is inserted from the front of the barrel 7, and the connector 5 is held by the inner stage 17 </ b> A of the base 17 screwed to the front end of the barrel 7 and the front portion of the barrel 7. Further, the rubber grip 8 is held by the rear end of the base 17 and the outer flange 7 </ b> C of the body 7. The base 17 incorporates a core holder 19 made of an elastic body such as rubber that holds the core 18 with an appropriate force.

  The weight body 20 is configured by winding a metal wire in a coil shape, and the weight body 20 is slidably built into the body 7 from the rear end of the body 7. The lead tank 3 is inserted into the weight body 20.

  Next, the inner sheath 11 is detachably screwed onto the trunk 7, and the sheath 9 is held by the outer collar 7 </ b> C of the trunk 7 and the outer collar 11 </ b> A of the inner sheath 11. Further, the weight body 20 incorporated in the body 7 is configured to be slidable in the longitudinal direction between the flange portion 2A of the connector 2 and the inner flange 12A of the core 12.

  The swinging mechanical pencil described above exerts an inertial force on the weight body 20 by shaking, and the weight body 20 comes into contact with the flange portion 2 </ b> A of the connector 2. Then, the inertial force of the weight body 20 is transmitted to the connector 2, the chuck 1 and the lead tank 3 are moved forward together with the connector 2, and a certain amount of lead 18 is fed out.

  Further, when the inner sheath 11 is removed from the body 7, the engaging portion 11C of the inner sheath 11 is press-fitted into the concave groove 9B of the sheath 9, so that there is no possibility that the sheath 9 will come off.

  Furthermore, since the internal parts can be visually observed from the translucent rubber grip 8 and the transparent sheath 9, a novel design appearance can be obtained. The same advantage can be obtained even if the sheath 9 is colored and transparent.

  FIG. 5 shows a second embodiment of the present invention. The same members as those in FIG. The front hole 107A of the body 107 is configured so that the core tank 3 and the connector 2 can be inserted therethrough. The front part of the metal ring 21 is press-fitted and fixed to the rear part of the barrel 107.

  Further, a rubber grip 8 for preventing slipping is externally fitted to the body 107. The core tank 3 is inserted from the front of the barrel 107, and the base 17 is screwed into the front portion of the barrel 107, whereby the rubber grip 8 is held between the rear end of the base 17 and the outer flange 21A of the metal ring 21.

  The inner sheath 11 is detachably screwed onto the metal ring 21, and the sheath 9 is held by the outer collar 21 </ b> A of the metal ring 21 and the outer collar 11 </ b> A of the inner sheath 11.

  The writing instrument of the present invention is not limited to a swing-out type mechanical pencil, but can be used for various writing instruments such as a knock-type mechanical pencil, a ballpoint pen, and a sign pen.

  When the inner sheath is removed from the trunk, there is no fear that the sheath will come off from the inner sheath, and when a seal or the like is attached to the inner sheath, it can be applied to a writing instrument that can easily remove the sheath from the inner sheath.

It is a principal part fragmentary sectional view which shows the latching | locking part of the inner sheath in Example 1 of this invention. Example 1 It is sectional drawing which shows Example 1 of this invention. Example 1 It is an expanded sectional view which shows the AA line of FIG. Example 1 It is an expanded sectional view which shows the BB line of FIG. Example 1 It is sectional drawing which shows Example 2 of this invention. (Example 2)

Explanation of symbols

7 trunk 9 sheath 9A inner collar 9B sheath 9 recessed groove 11 inner sheath 11A inner sheath 11 outer collar 11B inner sheath 11 protrusion 11C inner sheath 11 locking part 21 annulus 107 trunk

Claims (4)

  In a writing instrument in which an inner sheath is detachably attached to the trunk and the sheath is held by the trunk and the inner sheath, an inner collar is formed at the rear part of the sheath and a concave groove extending in the longitudinal direction is formed in the inner collar, Forming a flange on the rear portion and forming a protrusion extending forward in the longitudinal direction from the outer flange, forming a locking portion slightly wider than the concave groove of the sheath on the front portion of the protrusion, When the inner sheath is inserted, the locking portion of the inner sheath is detachably press-fitted and attached to the groove of the sheath, and the trunk is screwed into the front of the inner sheath to hold the sheath between the trunk and the inner sheath. A writing instrument characterized by being attached. In a writing instrument in which an inner sheath is detachably attached to an annulus attached to a trunk, and the sheath is held by the annulus and the inner sheath, an inner collar is formed at the rear of the sheath and a concave groove extending in the longitudinal direction is formed on the inner collar. Forming a protrusion at the rear of the inner sheath and a protrusion extending forward in the longitudinal direction from the outer casing, and a locking portion slightly wider than the concave groove of the sheath at the front of the protrusion. When the inner sheath is inserted into the sheath, the inner sheath latching part is detachably press-fitted and attached to the inner groove of the sheath, and the inner ring is screwed onto the front of the inner sheath to engage the inner ring with the inner ring. Writing instrument characterized by holding and attaching the sheath with the sheath.   The writing instrument according to claim 1 or 2, wherein the sheath is configured to be transparent or colored and transparent, and the inner sheath positioned inside the sheath is configured to be visible.   The concave groove formed in the sheath is formed so as to become narrower as it goes forward in the longitudinal direction, and both sides of the locking portion formed in the protrusion of the inner sheath are formed in a curved shape. The writing instrument according to any one of claims 1 to 3.

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