JP3137997U - Cap fitting structure - Google Patents

Abstract

An object of the present invention is to provide a simple cap fitting structure that can surely prevent an incomplete state of cap fitting and that suppresses pressurization or decompression of air in the cap due to the attachment / detachment of the cap.
There are provided fitting portions in which a pen tip outer surface of a writing instrument main body 2 and an inner surface of a cap 1 are detachably fitted at two positions spaced in the front-rear direction. The two fitting parts are composed of a climbing fitting part A and a sliding contact fitting part B. The overcoming stroke L1 from the start of fitting of the overriding fitting portion A to the completion of fitting is set larger than the sliding contact stroke L2 from the start of fitting of the sliding contact fitting portion B to the completion of fitting. The force required for the over-riding fitting of the over-riding fitting portion A is set larger than the force required for the sliding-contact fitting of the sliding contact fitting portion B.
[Selection] Figure 1

Description

  The present invention relates to a cap fitting structure. In detail, it is related with the cap fitting structure of the writing instrument provided with the climbing fitting part and the sliding contact fitting part. In the present invention, in the shaft cylinder, “front” indicates the pen tip side, and “rear” indicates the opposite side. In the cap, “front” refers to the closed side and “rear” refers to the open side.

  Conventionally, in this type of cap fitting structure, Patent Document 1 discloses a cap in which an inner wall is provided with an annular projection for airtight fitting and a plurality of supporting projections with an anti-sway projection arranged at intervals in the front and rear. In a cap fitting structure of a writing instrument to be attached to a shaft cylinder provided with an annular enormous portion that is tightly fitted over the annular projection and an engaging portion that is in sliding contact with the steady-state projection, the annular protrusion is an enormous portion. The contact length L1 of the annular protrusion and the enormous portion from the contact until the end of the overfitting and the sliding contact length L2 from the contact of the steady stop protrusion to the engagement portion until the end of the engagement A cap fitting structure for a writing instrument is disclosed in which the relationship is configured to satisfy the following expression L1 ≧ L2.

Utility model registration No. 2516879

  In the conventional cap fitting structure, the user interrupts the fitting of the cap in the middle of the sliding contact fitting before overcoming fitting, and the cap fitting is in an incomplete state (so-called half-cap state). To leave it unattended). However, even in the conventional cap fitting structure, the cap fitting may be incomplete due to manufacturing variations.

  Further, in the conventional cap fitting structure, when the cap is fitted to the pen nib side of the shaft cylinder, the air in the cap is pressurized by the fitting stroke of the fitting portion for airtight fitting, and the air in the shaft cylinder is compressed. The pressurized air may enter from the mouth and ink may leak out from the pen tip. Further, if the cap that is in a state of being fitted to the shaft cylinder is removed, the air in the cap is decompressed by the fitting stroke of the fitting portion that is airtightly fitted, and ink in the shaft cylinder may be drawn out from the air port to the outside. There is.

  The present invention solves the above-mentioned conventional problems, can reliably prevent the cap fitting from being incomplete, and can easily suppress the pressurization and decompression of the air in the cap due to the attachment / detachment of the cap. A cap fitting structure is to be provided.

  As a result of earnest research, the inventor focused on the force required for ride fitting and the force required for sliding contact fitting, and by identifying the magnitude relationship, the cap fitting was incomplete. It has been found that it can be surely prevented from being in a state.

  The present invention requires the following.

(Claim 1)
There are provided fitting portions in which the outer surface on the pen tip side of the writing instrument main body and the inner surface of the cap are detachably fitted at two positions spaced in the front-rear direction. A cap that includes a fitting portion, and the ride-on stroke from the start of fitting of the over-ride fitting portion to the completion of fitting is set larger than the sliding stroke from the start of fitting of the sliding contact fitting portion to the completion of fitting. A cap having a fitting structure, wherein a force required for the over-fitting of the cross-fitting fitting portion is set larger than a force required for the sliding-contact fitting of the sliding contact fitting portion. Mating structure.

(Claim 2)
The cap fitting structure according to claim 1, wherein the sliding contact fitting portion is airtightly fitted and the sliding contact stroke is set to 0.1 mm to 0.5 mm.

(Claim 3)
The sliding contact fitting portion that is airtightly fitted is disposed in front of the crossover fitting portion, and the side wall between the sliding contact fitting portion and the crossover fitting portion of the cap communicates with the outside air in the cap. The cap fitting structure according to claim 2, wherein a passage is provided therethrough.

(Claim 4)
3. The sliding contact fitting portion for airtight fitting is disposed in front of the crossover fitting portion, and an air passage is provided in the axial direction in the crossover fitting portion of the cap or the crossover fitting portion of the writing instrument body. Cap fitting structure.

  According to claim 1, it is possible to reliably prevent the cap from being incompletely fitted.

  According to the second aspect, it is possible to further prevent the pressurization and decompression of the air in the cap when the cap is attached and detached, and obtain a sufficient airtight fit.

  According to the third aspect, even if the cap is detachably attached, pressurization and decompression of the air in the cap can be avoided.

  According to the fourth aspect, even if the cap is detachably attached, pressurization and decompression of the air in the cap can be avoided.

  The best mode for carrying out the present invention will be described.

  [1] In the present invention, fitting parts for removably fitting the outer surface of the writing instrument body 2 on the pen tip 4 side and the inner surface of the cap 1 are provided at two positions spaced in the front-rear direction. The joint portion is composed of a crossover fitting portion A and a sliding contact fitting portion B. The cap fitting structure is set to be larger than the sliding contact stroke L2 from the start to the completion of fitting, and the force required for the over-fitting of the over-fitting fitting portion A is slid in the sliding-contact fitting portion B. It is a requirement that it is set to be larger than the force required for fitting (claim 1).

  In the cap fitting structure (Claim 1), the force required for the over-fitting of the cross-fitting fitting portion A is set larger than the force required for the sliding contact fitting of the sliding contact fitting portion B. Thus, it is possible to reliably prevent the cap from being incompletely fitted.

  On the other hand, if the force required for the crossover fitting of the crossover fitting portion A is set to be smaller than the force required for the sliding contact fitting of the sliding contact fitting portion B, the cap 1 is used as a writing instrument. When mounting on the main body 2, a large force required for fitting of the sliding contact fitting part B is applied between the start of the fitting of the crossover fitting part A and the end of the fitting. Further, there is a risk that the cap 1 is interrupted in the middle of the crossover fitting portion A and the cap fitting is incomplete.

  The crossover fitting portion A includes an inward projection A1 on the inner surface of the cap 1 and an outward projection A2 on the outer surface of the writing instrument body 2 that can be fitted over the inward projection A1. The sliding contact fitting portion B includes a smooth surface on at least one of the inner surface of the cap 1 and the outer surface of the writing instrument body 2. The force required for the over-fitting of the over-fitting fitting portion A and the force required for the sliding-contact fitting of the sliding contact fitting portion B are measured independently so that there is no mutual influence.

  [2] In the cap fitting structure (Claim 1), the sliding contact fitting portion B is airtightly fitted, and the sliding contact stroke is set to 0.1 mm to 0.5 mm (Claim 2). Is preferred.

  In the cap fitting structure (Claim 2), the sliding contact fitting portion B is airtightly fitted, that is, the sliding contact fitting portion B having a fitting stroke shorter than the fitting stroke of the overriding fitting portion A. The airtight fitting is advantageous in preventing the pressurization and decompression of the air in the cap 1 when the cap is attached and detached. In addition, by setting the sliding contact stroke to an appropriate extremely short range of 0.1 mm to 0.5 mm, it is possible to further prevent the pressurization and decompression of the air in the cap 1 when the cap is attached and detached. Get a good airtight fit.

  If the sliding contact stroke is less than 0.1 mm, sufficient airtight fitting cannot be performed, and it is difficult to sufficiently seal the pen tip 4. In addition, when the sliding stroke exceeds 0.5 mm, the pressurization and decompression of the air in the cap 1 when the cap is attached / detached becomes large, and ink leakage from the pen tip 4 side is caused by repeating the attachment / detachment of the cap. May occur.

  [3] In the cap fitting structure (Claim 2), the sliding contact fitting portion B that is airtightly fitted is arranged in front of the overpass fitting portion A, and the sliding contact fitting portion B of the cap 1 It is preferable that an air hole communicating with the inside of the cap 1 and the outside air is provided in the side wall between the ride-over fitting portion A (Claim 3).

  In the cap fitting structure (Claim 3), when the cap 1 is attached vigorously, the pressurized air in the cap 1 is quickly released to the outside through the air holes, while the cap 1 is vigorously removed. When it is removed, air is taken into the cap 1 through the air hole, and the reduced pressure state in the cap 1 can be quickly eliminated.

  When the air hole is not present, the cap 1 is vigorously attached, so that the air in the cap 1 is separated by the side wall of the cap 1 on the crossover fitting portion A before the sliding contact fitting portion B starts to be fitted. May be pressurized, and the pressurized air may enter the writing instrument body 2. Further, when the air hole is not present, if the cap 1 is vigorously removed, the air in the cap 1 is depressurized by the side wall of the cap 1 on the overriding fitting portion A side, and the ink in the writing instrument main body 2 is discharged from the air port 21 to the outside. There is a risk of pulling out.

  [4] In the cap fitting structure (Claim 2), the sliding contact fitting portion B that is airtightly fitted is disposed in front of the getting over fitting portion A, and the getting over fitting portion A of the cap 1 or the writing instrument body It is preferable that an air passage is provided in the overriding fitting portion A in the axial direction (Claim 4).

  In the cap fitting structure (Claim 4), when the cap 1 is vigorously attached, the pressurized air in the cap 1 is quickly released from the opening of the cap 1 through the air passage. When the cap 1 is vigorously removed, air is taken into the cap 1 from the opening of the cap 1 through the air passage, and the reduced pressure state in the cap 1 can be quickly eliminated.

  When the air passage does not exist, the cap 1 is vigorously attached, so that the air in the cap 1 is separated by the side wall of the cap 1 on the overriding fitting portion A before the sliding contact fitting portion B starts to be fitted. May be pressurized, and the pressurized air may enter the writing instrument body 2. Further, when the air passage is not present, if the cap 1 is vigorously removed, the air in the cap 1 is depressurized by the side wall of the cap 1 on the crossover fitting portion A side, and the ink in the writing instrument main body 2 is discharged from the air port 21 to the outside. There is a risk of pulling out.

(First embodiment)
FIG. 1 shows a first embodiment of the present invention.

  The cap 1 is obtained by injection molding of a synthetic resin. The cap 1 is connected by a bottomed cylindrical inner cylinder portion 11 whose front end is closed and rear end is opened, and an outer peripheral surface of the inner cylinder portion 11 and a plurality of connecting ribs 13 extending in a plurality of axial directions. The cylindrical outer tube portion 12 is open at both ends.

  The rear end opening of the inner cylinder portion 11 projects rearward from the rear end of the connecting rib 13. An annular seal portion B1 made of an annular smooth surface is integrally formed on the outer peripheral surface of the rear end opening of the inner cylinder portion 11.

  An air passage extending in the axial direction is provided between each of the connecting ribs 13, and the rear end of the air passage is formed between the outer peripheral surface of the rear end portion of the inner tube portion 11 and the inner peripheral surface of the outer tube portion 12. It communicates with the annular gap between them. In the present embodiment, six connecting ribs 13 are provided at regular intervals, thereby forming six air passages. The outer cylindrical portion connecting side of the rear end portion of the connecting rib 13 extends rearward from the inner cylindrical portion connecting side and is positioned slightly forward of the annular seal portion B1 (open end portion of the inner cylindrical portion 11). is doing. The outer tube portion connection side of the rear end portion of the connecting rib 13 serves as a contact wall portion with the front end portion of the shaft tube 3 when the cap is mounted. Since the inner cylinder part connection side of the rear end part of the connecting rib 13 is located sufficiently forward of the opening end part of the inner cylinder part 11, the annular seal part B1 on the outer peripheral surface of the inner cylinder part 11 and the shaft cylinder 3 are arranged. When the annular airtight part B2 on the inner peripheral surface is fitted, the elastic deformation of the annular seal part B1 inward in the radial direction can be facilitated.

  An annular inward projection A1 is integrally formed on the inner peripheral surface of the outer cylinder portion 12 slightly behind the annular seal portion B1. The inward projection A1 gets over and fits with the outward projection A2 of the shaft tube 3 when the cap is mounted.

  The writing instrument main body 2 includes a bottomed cylindrical shaft cylinder 3 whose front end is opened, an ink storage member 5 including a plurality of comb teeth 51 fitted into the front end opening of the shaft cylinder 3, and the ink storage A pen tip 4 held at the front end of the member 5 via a pen tip holding cylinder 41 and an ink guide core 6 connected to the pen tip 4 and inserted into the axial hole of the ink reservoir member 5 are provided. . An air port 21 is opened at the front end of the shaft tube 3.

  The shaft cylinder 3 is obtained by injection molding of synthetic resin. An ink tank 7 for directly storing ink is formed behind the ink storage member 5 in the shaft cylinder 3. An annular recess that opens forward is formed in the front end opening of the shaft tube 3. The annular recess exposes the inner peripheral surface of the front end opening of the shaft tube 3, and an annular airtight portion B2 made of an annular smooth surface is integrally formed on the inner peripheral surface of the front end opening of the shaft tube 3. . The annular airtight part B2 may be an annular protrusion.

  An annular outward projection A2 is integrally formed on the outer peripheral surface of the shaft cylinder 3 slightly behind the annular airtight portion B2. When the cap is mounted, the outward projection A2 gets over and fits with the inward projection A1 of the outer cylinder portion 12. In addition, you may comprise by the some point protrusion which disperse | distributed either one of the said inward protrusion A1 or the said outward protrusion A2 in the periphery.

  An annular retaining protrusion 31 is integrally formed on the inner peripheral surface of the shaft cylinder 3 behind the outward protrusion A2. The retaining protrusion 31 is fitted over and fitted with a supporting comb tooth having an outer diameter larger than that of the other comb teeth of the ink retaining member 5 to prevent the ink retaining member 5 from falling off. Since the front end portion of the shaft tube 3 in front of the retaining protrusion 31 (that is, the front end portion of the shaft tube 3 including the annular airtight portion B2 and the outward projection A2) is in a non-contact state with the ink reservoir member 5, ink The fitting of the retaining member 5 does not affect the inner diameter of the annular airtight portion B2 and the outer diameter of the outward projection A2.

  On the outer surface of the shaft cylinder 3 behind the outward projection A2, a steady-state projection 32 made up of a plurality of dot-like projections distributed in a circumferential manner is integrally formed. The anti-rest protrusion 32 is pressed against the inner surface of the opening of the cap 1 when the cap is mounted. Thereby, wobbling in the radial direction of the opening of the cap 1 is prevented, and the sealing performance between the annular airtight portion B2 and the annular seal portion B1 is further improved.

  The ink storage member 5 is obtained by injection molding of a synthetic resin. The ink storage member 5 includes a plurality of disc-shaped comb teeth 51 and ink storage grooves 52 formed between the comb teeth 51. The ink reservoir member 5 is a member that temporarily holds overflow ink from the ink tank 7 as the pressure in the ink tank 7 increases.

  In this embodiment, the climbing stroke L1 of the climbing fitting portion A (that is, the axial movement length from when the outward projection A2 and the inward projection A1 start to ride over to when the ride over fitting ends) is 1 .1mm is set. The sliding contact stroke L2 of the sliding contact fitting portion B (that is, the axial movement length from the start to the end of the annular seal portion B1 and the annular airtight portion B2) is set to 0.25 mm. Has been.

  In the present embodiment, the force required for the over-fitting of the over-fitting fitting portion A is set to 1.2 kg. The force required for sliding contact fitting of the sliding contact fitting portion B is set to 0.3 kg.

(Second embodiment)
FIG. 2 shows a second embodiment of the present invention.

  The cap 1 is obtained by injection molding of a synthetic resin. The cap 1 is connected by a bottomed cylindrical inner cylinder portion 11 whose front end is closed and rear end is opened, and an outer peripheral surface of the inner cylinder portion 11 and a plurality of connecting ribs 13 extending in a plurality of axial directions. And a cylindrical outer cylinder portion 12 having both ends opened.

  An annular seal portion B1 made of an annular smooth surface is integrally formed on the inner peripheral surface of the rear end opening of the inner cylinder portion 11. The annular seal portion B1 is fitted in sliding contact with the annular airtight portion B2 on the outer surface of the shaft tube 3.

  An annular inward projection A <b> 1 is integrally formed on the inner surface of the outer cylinder portion 12. The inward projection A1 gets over and fits with the outward projection A2 of the shaft tube 3 when the cap is mounted.

  An air passage extending in the axial direction is provided between each of the connecting ribs 13. When the cap is attached, the rear end of the connecting rib 13 is brought into contact with the front end of the shaft tube 3.

  As in the first embodiment, the writing instrument main body 2 includes a bottomed cylindrical shaft cylinder 3 having an open front end and a plurality of comb teeth 51 fitted into the front end opening of the shaft cylinder 3. A pen tip 4 held at the front end of the ink reservoir member 5 via a pen tip holding cylinder 41, and an ink connected to the pen tip 4 and inserted into the axial hole of the ink reservoir member 5 An induction core 6 is provided. An air port 21 is opened at the front end of the pen tip holding cylinder 41.

  An annular outward projection A2 is integrally formed on the outer peripheral surface of the front end opening of the shaft tube 3. When the cap is mounted, the outward projection A2 gets over and fits with the inward projection A1 of the outer cylinder portion 12. In addition, you may comprise by the some point protrusion which disperse | distributed either one of the said inward protrusion A1 or the said outward protrusion A2 in the periphery.

  On the outer surface of the pen tip holding cylinder 41, an annular airtight portion B2 made of an annular smooth surface is integrally formed. When the cap is attached, the annular airtight part B2 is slidably fitted to the annular seal part B1. The annular airtight part B2 may be an annular protrusion.

  In this embodiment, the climbing stroke L1 of the climbing fitting portion A (that is, the axial movement length from when the outward projection A2 and the inward projection A1 start to ride over to when the ride over fitting ends) is 1 .1mm is set. The sliding contact stroke L2 of the sliding contact fitting portion B (that is, the axial movement length from the start to the end of the annular seal portion B1 and the annular airtight portion B2) is set to 0.25 mm. Has been.

  In the present embodiment, the force required for the over-fitting of the over-fitting fitting portion A is set to 1.2 kg. The force required for sliding contact fitting of the sliding contact fitting portion B is set to 0.4 kg.

  Since the other configuration of this embodiment is the same as that of the first embodiment, the description thereof is omitted.

(Third embodiment)
FIG. 3 shows a third embodiment of the present invention.

  The cap 1 is obtained by injection molding of a synthetic resin. The cap 1 is composed of a cylindrical body with a bottom having a front end closed and a rear end opened. The cap body includes a small-diameter portion 14 and a large-diameter portion 15 connected to the rear of the small-diameter portion 14.

  The rear end portion of the small-diameter portion 14 of the cap body has a step shape, and an annular seal portion B1 made of an annular smooth surface is formed on the inner surface thereof. A plurality of contact ribs 16 extending in the axial direction are formed on the inner surface of the small diameter portion 14. The rear end of the contact rib 16 contacts the front end of the shaft tube 3.

  A plurality of fitting ribs 17 extending in the axial direction are integrally formed on the inner surface of the large-diameter portion 15 of the cap body. The fitting rib 17 includes an inward projection A1 at an intermediate portion thereof. An air passage is formed between the fitting ribs 17. The inward projection A1 gets over and fits with the outward projection A2 of the shaft tube 3 when the cap is mounted.

  As in the first embodiment, the writing instrument main body 2 includes a bottomed cylindrical shaft cylinder 3 having an open front end and a plurality of comb teeth 51 fitted into the front end opening of the shaft cylinder 3. A pen tip 4 held at the front end of the ink reservoir member 5 via a pen tip holding cylinder 41, and an ink connected to the pen tip 4 and inserted into the axial hole of the ink reservoir member 5 An induction core 6 is provided. An air port 21 is opened at the front end of the shaft tube 3.

  An annular airtight portion B2 made of an annular smooth surface is integrally formed on the outer peripheral surface of the front end opening of the shaft tube 3. The annular airtight part B2 may be an annular protrusion. When the cap is mounted, the annular airtight portion B2 is fitted in sliding contact with the annular seal portion B1, and the inside of the cap 1 is brought into an airtight state.

  An annular outward projection A2 is integrally formed on the outer peripheral surface of the shaft tube 3 behind the annular airtight part B2. When the cap is mounted, the outward projection A2 gets over and fits with the inward projection A1 of the outer cylinder portion 12. Note that either the inward projection A1 or the outward projection A2 may be constituted by a plurality of dot-like projections dispersed in a circumferential shape.

  In this embodiment, the climbing stroke L1 of the climbing fitting portion A (that is, the axial movement length from when the outward projection A2 and the inward projection A1 start to ride over to when the ride over fitting ends) is 1 .3mm is set. The sliding contact stroke L2 of the sliding contact fitting portion B (that is, the axial movement length from the start to the end of the annular seal portion B1 and the annular airtight portion B2) is set to 0.25 mm. Has been.

  In the present embodiment, the force required for the over-fitting of the over-fitting fitting portion A is set to 1.0 kg. The force required for sliding contact fitting of the sliding contact fitting portion B is set to 0.4 kg.

  Since the other configuration of this embodiment is the same as that of the first embodiment, the description thereof is omitted.

1 is a longitudinal sectional view of a first embodiment of the present invention. It is a longitudinal cross-sectional view of the second embodiment of the present invention. It is a longitudinal cross-sectional view of the third embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cap 11 Inner cylinder part 12 Outer cylinder part 13 Connecting rib 14 Small diameter part 15 Large diameter part 16 Contact rib 17 Fitting rib 2 Writing tool main body 21 Air port 3 Shaft cylinder 31 Retaining protrusion 32 Stabilizing protrusion 4 Pen tip 41 Pen Tip retaining cylinder 5 Ink retaining member 51 Comb tooth 52 Ink retaining groove 6 Ink guide core 7 Ink tank A Overcoming fitting part A1 Inward protrusion A2 Outward protrusion B Sliding contact fitting part B1 Annular seal part B2 Annular airtight part L1 Stroke L2 Sliding stroke

Claims (4)

  There are provided fitting portions in which the outer surface on the pen tip side of the writing instrument main body and the inner surface of the cap are detachably fitted at two positions spaced in the front-rear direction, and the two fitting portions cross over and slide into contact with the fitting portion. A cap that includes a fitting portion, and has a jumping stroke from the start of fitting of the overpass fitting portion to completion of fitting over a sliding stroke from the start of fitting of the sliding contact fitting portion to completion of fitting. A cap having a fitting structure, wherein a force required for the over-fitting of the cross-fitting fitting portion is set larger than a force required for the sliding-contact fitting of the sliding contact fitting portion. Mating structure.   The cap fitting structure according to claim 1, wherein the sliding contact fitting portion is airtightly fitted and the sliding contact stroke is set to 0.1 mm to 0.5 mm.   The sliding contact fitting portion for airtight fitting is disposed in front of the crossover fitting portion, and the side wall between the sliding contact fitting portion and the crossover fitting portion of the cap communicates with the air inside and outside the cap. The cap fitting structure according to claim 2, wherein a passage is provided therethrough.   3. The sliding contact fitting portion for airtight fitting is disposed in front of the crossover fitting portion, and an air passage is provided in the axial direction in the crossover fitting portion of the cap or the crossover fitting portion of the writing instrument body. Cap fitting structure.

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