JP6032999B2 - Extra lead case - Google Patents

Description

  The present invention relates to an extra lead case that accommodates a writing lead such as a lead for a mechanical pencil or a pencil lead.

  Conventionally, there are many replacement core cases composed of a case body and a cap. When taking out the writing core, the extra lead case disclosed in Patent Documents 1 to 3 takes out the writing core after removing the cap from the case body and tilting the case body with the opening of the body facing downward. I can't. At that time, if the case body is excessively inclined, a large amount of writing core may fall from the case body and spill. Therefore, Patent Document 4 discloses a technique in which after removing the cap, the writing core can be taken out without tilting the opening of the case main body downward.

Japanese Patent Laid-Open No. 9-290593 JP-A-11-227383 JP 2008-55804 A JP 2010-173247 A

  However, in the invention described in Patent Document 4, after removing the cap, the writing core protruding from the case main body is not easily picked by a finger, and it may be difficult to take out or the writing core may be broken.

Therefore, the inventor has achieved the following inventions (1) to (5) after earnest development.
(1) In a replacement core case composed of a writing core, a case main body that accommodates the writing core, and a cap that seals the case main body, the entire circumference of the writing core tip protrudes from the case main body when the cap is removed from the case main body. An extra lead case characterized by that.
(2) The extra lead case characterized in that the protruding length of the tip of the writing core is 5 to 10% of the total length of the writing core.
(3) A replacement core case characterized in that the inner diameter of the opening side end of the case main body is enlarged toward the opening.
(4) A replacement core case in which a step is formed inside the case body.
(5) together with the case body and the cap is screwed by screws, characterized in that the ribs of the stop loosening the cap internal surface are formed core replacement case.

According to the inventions of (1) and (2), the end of the writing core protrudes from the case body when the cap is removed from the case body, so that the contents of the replacement core case are not inclined and the contents It is difficult to break the writing core, and it can be easily taken out.
According to the invention of (3), since the inner diameter of the tip of the opening of the case main body is enlarged, the tip of the opening is not stained with the writing core, and the dirt adheres to the boundary line of the enlarged diameter portion. The writing core can be taken out without getting dirty.
Further, according to the invention of (4), since the step is formed inside the case main body, the writing core can be prevented from sticking to the case main body due to static electricity or the like. it can.
Further, according to the invention of (5), since the rib for preventing loosening of the inner surface of the cap is press-fitted into the case main body, the cap can be prevented from falling off from the case main body during transportation or the like.

It is a general view of the spare lead case in this invention. It is the figure which removed the cap from the case main body in this invention. It is component drawing of the case main body in this invention. It is an enlarged view of the case main body front in this invention. It is a component drawing of the cap in the present invention. It is component drawing of the other example of the cap in this invention.

  Hereinafter, description will be given with reference to the drawings. In the present invention, the front indicates the cap side of the extra lead case, and the rear indicates the tail plug side. Further, the present invention is not limited to the embodiments and drawings in the following description.

  FIG. 1 is an overall view of a spare core case according to the present invention. 1A is a perspective view, FIG. 1B is a front view, and FIG. 1C is a longitudinal sectional view of FIG. 1B. The replacement core case includes a writing core 1 held via a pencil holder, a mechanical pencil, etc., a case main body 2 that accommodates the writing core 1, a cap 3 that is screwed onto the front end of the case main body 2 and is detachable, and a case main body. 2 consists of a tail plug 4 that plugs the back of 2. When the cap 3 is not used, the case main body 2 is sealed and the writing core 1 cannot be taken out.

  The writing core 1 accommodated in the spare core case is a rod-shaped core body having a diameter of 0.3 mm to 2.0 mm. Examples of the writing core 1 include a general sharp core, a pencil core, a color core, a ceramic core, and a thermochromic core containing a thermochromic material that changes color by frictional heat.

  When the case body 2 and the cap 3 are screwed together, the gap X in the axial direction of the writing core 1 with respect to the case body 2 is preferably 5% to 10% of the length of the writing core. If the gap X is less than 5% of the total length of the writing core 1, the writing core 1 may be accidentally folded when the cap 3 is screwed, or the writing core 1 remains in the replacement core case. It becomes difficult to check the remaining amount of the writing core 1 with the swaying sound. Conversely, if the gap X exceeds 10% of the total length of the writing core 1, the writing core 1 is greatly shaken in the axial direction in the case body 2 when carrying the replacement core case, which may lead to damage to the writing core 1. There is.

Although not shown here, the boundary line between the tail plug 4 and the writing core 1 can be hidden by depositing an opaque or gradation pattern transfer film or coating an opaque color on the case body 2.

Furthermore, by covering the entire replacement core case with a packaging material such as a plastic film, it is possible to protect the appearance of the replacement core case when not in use, such as during transportation. Furthermore, it is possible to prevent the designability of the extra lead case at the time of use from being impaired by providing the packaging material with information necessary at the time of distribution, such as a bar code or the like. Moreover, the packaging material can be easily torn by forming perforations in the packaging material.

  FIG. 2 is a view in which the cap is removed from the case body of the extra lead case according to the present invention. 2A is a front view, and FIG. 2B is a longitudinal sectional view of FIG. The case body 2 and the cap 3 are screwed with screws. The cap 3 is detachable by rotating relative to the case body 2. When the cap 3 is removed from the case main body 2, the front end of the writing core 1 protrudes over the entire circumference. Since the end of the writing core 1 protrudes over the entire circumference, it can be easily picked with a hand or a finger. The protruding length Y of the writing core 1 from the case body 2 is preferably 5 to 10% of the entire length of the writing core. If the protruding length Y is less than 5% of the entire length of the writing core 1, it is difficult to pick it up with a finger, and if it exceeds 10%, the take-out operation may be accidentally broken when picked.

The tail plug 4 can adjust the length of the writing core 1 protruding from the case body 2. The tail plug 4 is inserted from the opened rear end side on the rear side of the case body 2 and fixed by press fitting or fitting with a protrusion. The tail plug 4 has a bottom-up shape in which the writing core 1 protrudes from the case body 2. The protruding amount of the writing core 1 from the case body 2 can be adjusted by the length of the tail plug 4 in the axial direction. The tail plug 4 and the case body 2 may be formed as an integral part.

  FIG. 3 is a component diagram of the case body 2 in the present invention. 3 (a) is a perspective view from the front, FIG. 3 (b) is a left side view, FIG. 3 (c) is a plan view, FIG. 3 (d) is a front view, and FIG. 3 (e) is FIG. ) Is a longitudinal sectional view, FIG. 3 (f) is a rear perspective view, and FIG. 3 (g) is a right side view. FIG. 4 is an enlarged view of the front side of the case body 2. The case body 2 is formed in a cylindrical shape, and can be easily carried and stored in a pencil case or the like by making the outer diameter substantially the same as that of a general writing instrument. The case body 2 includes a small tube portion 21 at the front and a large tube portion 22 at the rear. A screw portion 23 which is a single thread is formed on the outer surface of the small tube portion 21 and is screwed into the cap 3. A step portion 24 is formed on the inner surface behind the small tube portion 21. The step portion 24 is formed with a diameter smaller than the inner surface 25 of the large tube portion 22 and larger than the inner surface 26 of the small tube portion 21. Further, by making the inner surface 25 of the large tube portion and the inner surface 26 of the small tube portion have different diameters, the contact area between the writing core 1 and the inner surface of the case main body 2 is reduced, and the writing core 1 and the case main body 2 are adhered by static electricity or the like. Sticking can be prevented. Further, by chamfering the connecting portion between the inner surface 25 and the inner surface 26 of the stepped portion 24 in an inclined shape, it is possible to prevent the writing core 1 from being worn when the writing core 1 is rubbed by contact with the case body 2. The sloped chamfer may be an R-shaped curved surface.

  The opening end portion 27 in front of the small tube portion 21 has a slope shape whose diameter is increased from the opening portion 28 which is a boundary line of the enlarged diameter portion toward the front. By making the diameter of the slope larger, the opening end 27 and the writing core 1 that are touched by the hand and fingers are not in contact with each other, and the opening 28 and the writing core 1 are in contact with each other. As a result, the shaving residue of the writing core 1 adheres to the opening 28 and does not adhere to the opening end 27 that is touched by the hand and fingers, so that the hand is soiled when the writing core is taken out. There is no. In this embodiment, the shape is inclined, but the opening end 27 only needs to have a larger inner diameter than the opening 28, and a method of forming a projection (projection) in a stepped shape or part thereof may be used.

  A fitting portion 29 is formed behind the inner surface 25 of the large tube portion in order to fix the tail plug 4. As shown in FIG. 3 (e), the fitting portion 29 is preferably fitted with protrusions (convex portions, undercuts), but may be a method using an adhesive or the like as long as it can be fixed to the tail plug 4.

  FIG. 5 is a component diagram of the cap 3 in the present invention. 5 (a) is a perspective view from the front, FIG. 5 (b) is a left side view, FIG. 5 (c) is a plan view, FIG. 5 (d) is a longitudinal sectional view of FIG. e) is a front view, FIG. 5 (f) is a longitudinal sectional view of FIG. 5 (e), FIG. 5 (g) is a rear perspective view, and FIG. 5 (h) is a right side view. The cap 3 is formed in a cylindrical shape with the rear opened, and a protrusion 31 is formed on the rear outer peripheral surface. In the case where the outer shape of the cap 3 is formed in a cylindrical shape, the protruding portion 31 can prevent the replacement core case from rolling when placed on a flat surface such as a desk. In addition, you may form the projection part 31 in the outer peripheral surface of a case main body. Moreover, the surface of the cap 3 can also be easily removed from the case body 2 by performing a satin treatment by knurling or the like. A vent hole 33 having a diameter smaller than the outer diameter of the writing core 1 communicating from the front to the rear of the cap 3 is formed on the front ceiling surface 32, and suffocation can be prevented even if swallowed by mistake. A plurality of ribs 34 are formed in front of the inner surface of the cap 3, and a female screw portion 35 screwed with the cap body is formed in the rear. The rib 34 is formed to have a smaller diameter than the outer diameter of the small tube portion 21 of the case main body 2, but it is desirable that the rib 34 does not contact when the cap 3 is fixed to the case main body 2.

FIG. 6 is a component diagram of another example cap. 6 (a) is a front perspective view, FIG. 6 (b) is a left side view, FIG. 6 (c) is a plan view, FIG. 6 (d) is a longitudinal sectional view of FIG. 6 (c), and FIG. e) is a front view, FIG. 6F is a longitudinal sectional view of FIG. 6E, FIG. 6G is a rear perspective view, and FIG. 6H is a right side view. The difference from the cap of FIG. 5 is that three extension ribs 36 for preventing loosening are formed on the inner surface of the cap. The rest is the same as the cap of FIG. When the cap 3 is fixed to the case main body 2, the extension rib 36 comes into contact with the small diameter portion 21 of the case main body 2, thereby preventing the cap 3 from loosening from the case main body 2 and a click feeling when screwing is completed. be able to. The number of the extension ribs 36 is preferably about half of the ribs 34. The press-fitting allowance between the inscribed diameter of the extension rib 36 and the outer diameter of the small diameter portion 21 of the case body 2 is preferably 0.02 mm to 0.10 mm.

  In the present invention, the material of the spare core case is made of a resin material such as polypropylene, ABS, polyethylene, polycarbonate, etc., the case body 2, the cap 3, and the tail plug 4. The cap 3 and the tail plug 4 may be made of a material having rubber elasticity such as a thermosetting rubber, a thermoplastic elastomer, or a commercially available eraser. Thereby, the impact at the time of dropping can be relieved. It is also possible to erase the wrong place when writing with the writing core. Further, the cap 3 can be removed without slipping.

  The present invention is a replacement core case in which a writing core can be easily taken out, and is an industrially useful invention.

DESCRIPTION OF SYMBOLS 1 Writing core 2 Case main body 3 Cap 4 Tail plug 21 Small cylinder part 22 Large cylinder part 23 Screw part 24 Step part 25 Inner surface 26 of a large cylinder part 27 Open end part 28 Opening part 29 Fit part 31 Protrusion part 32 Ceiling surface 33 Ventilation hole 34 Rib 35 Female screw part 36 Extension rib

Claims (4)

In refill lead case comprising a cap that seals the case body and a case body housing the writing lead and the writing lead, the entire circumference of the writing lead tip protrudes from the case body when the cap is removed from the case body, the case body with the cap is screwed by screws, refill lead case wherein the ribs of the loosening stopper is formed in the cap internal surface.   2. The extra lead case according to claim 1, wherein the protruding length of the tip of the writing core is 5 to 10% of the total length of the writing core.   The replacement core case according to claim 2, wherein an inner diameter of the opening side end portion of the case main body is enlarged toward the opening portion. 4. The extra lead case according to claim 3, wherein a step is formed inside the case body.

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