JP3650900B2 - Writing instrument caps - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cap such as a writing instrument. More specifically, the present invention relates to a writing instrument or the like cap in which an inner cap for airtightness is mounted inside the outer cap.
[0002]
[Prior art]
Conventionally, in this type of writing instrument cap, for example, Japanese Utility Model Laid-Open No. 56-11877 discloses a bottomed cylindrical core (corresponding to the inner cap of the present invention) provided with a flange at one end. The flange portion (corresponding to the second collar portion of the present invention) is exposed and inserted into a cylindrical cap body (corresponding to the outer cap of the present invention) with both ends opened, and further the cap body A writing instrument cap having a bullet support inserted therein is disclosed.
[0003]
Since the cap disclosed in the above publication (Japanese Utility Model Publication No. Sho 56-11877) engages the elastic support and the core into the cap body and is inserted as a unit, the core can be firmly fixed to the inner peripheral surface of the cap body. However, a separate member such as a bullet support is required, which is not suitable for an inexpensive writing instrument cap made of synthetic resin. In addition, a large pressure input is required to firmly fix the core, which makes installation work difficult.
[0004]
In recent years, many caps (so-called ventilation caps) have been proposed that do not suffocate even if an infant accidentally swallows them. For example, Japanese Utility Model Laid-Open No. 4-77490 discloses an outer cap that is open at both ends, and a writing instrument cap that has an inner cap attached to the outer cap, an annular convex portion on the inner peripheral surface of the outer cap, A structure in which an annular recess on the outer peripheral surface of the cap closing side is engaged is disclosed.
[0005]
The cap of the above publication (Japanese Utility Model Publication No. 4-77490) has a gap between the outer surface of the inner cap opening end and the inner surface of the outer cap. . In addition, in the cap of the above publication, the attachment location of the inner cap and the outer cap is only one location on the inner cap closing side composed of an annular convex portion and an annular concave portion. Therefore, the attached state of the inner cap becomes unstable with respect to the outer cap, and there is a risk of wobbling in the radial direction.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned conventional problems, facilitates the mounting operation of the inner cap to the outer cap, and makes the mounting state of the inner cap and the outer cap strong and does not wobble. An object of the present invention is to provide a cap such as a writing instrument having a simple structure in which the pen tip does not enter the gap between the inner cap and the outer cap. Moreover, it is going to provide the ventilation cap provided with the said structure. In the present invention, “front” indicates the cap closed end direction, and “rear” indicates the cap opening end direction.
[0007]
[Means for Solving the Problems]
(1) Overview The present invention is a cap 1 such as a writing instrument in which an inner cap 4 made of a synthetic resin having one end opened and the other end closed is mounted in a synthetic resin outer cap 2 having both ends opened. The first cap 5 is integrally provided on the outer surface of the opening end of the inner cap 4, and the locking projection 3 is integrally provided on the inner surface of the outer cap 2, and the first flange 5 and the locking projection 3, and the second cap 6 is integrally provided on the outer surface of the inner cap 4 on the closing side, and the second cap 6 is brought into contact with the front opening end of the outer cap 2. (Claim 1).
[0008]
According to the above configuration (Claim 1), the first flange 5 is integrally provided at the opening end of the inner cap 4 made of synthetic resin. At this time, it is easily elastically deformed radially inward. As a result, the first flange 5 can get over the locking projection 3 with a small pushing force, and the attachment work of the inner cap 4 into the outer cap 2 is facilitated. In addition, since the inner cap 4 is fixed to the inner wall of the outer cap 2 at two locations on the opening end and the closed side, the attached state of the inner cap 4 and the outer cap 2 can be strengthened. Further, by fitting the first flange 5 at the opening end of the inner cap 4 and the locking projection 3 of the outer cap 2, there is no gap between the opening end of the inner cap 4 and the inner surface of the outer cap 2. There is no risk of damaging the pen tip. In addition, the cap 1 having the above-described structure has a simple structure including only two members made of synthetic resin, that is, the inner cap 4 and the outer cap 2, and is coupled with the point that the mounting operation of the inner cap 4 is easy and relatively inexpensive. Can be manufactured.
[0009]
(2) Large diameter portion, small diameter portion Further, in the above-described configuration (Claim 1), the large diameter portion 7 is provided on the closed side of the outer surface of the inner cap 4 between the first collar portion 5 and the second collar portion 6, It is preferable that the small diameter portion 8 is provided on the opening side, and the large diameter portion 7 is fitted to the inner surface of the outer cap 2 (Claim 2). That is, in addition to the over-fitting of the first flange 5 and the locking projection 3, the inner cap with respect to the outer cap 2 is configured by fitting the large-diameter portion 7 of the inner cap 4 with the inner surface of the outer cap 2. The mounting state in the radial direction of 4 is further stabilized, and rattling or the like does not occur.
[0010]
(3) Ventilation cap In the cap of the above configuration (Claims 1 and 2), when the ventilation cap does not suffocate even if an infant swallows it by mistake, the outer surface of the small diameter portion 8 of the inner cap 4 and the inner surface of the outer cap 2 And an annular seal portion 82 that is airtightly fitted to the writing instrument main body is provided on the inner surface of the small diameter portion 8, and the annular wall is provided on the peripheral wall of the small diameter portion 8 behind the seal portion 82. A configuration in which a horizontal hole 81 that allows the space 9 to communicate with the inside of the cap is provided, and a vertical hole 71 that allows the annular space 9 to communicate with the outside is provided in the large-diameter portion 7 (Claim 3) is effective. It is.
[0011]
According to the configuration (Claim 3), the operational effects of Claims 1 and 2 (the operation of attaching the inner cap 4 to the outer cap 2 is facilitated, and the mounting state of the inner cap 4 and the outer cap 2 is wobbled. In addition, it is possible to easily obtain a ventilation cap provided with a simple structure in which the pen tip does not enter the gap between the inner cap 4 and the outer cap 2.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[0013]
Embodiments of the present invention will be described with reference to the drawings.
[0014]
1 to 7 show an embodiment of the present invention and a cap 1 such as a writing instrument. FIG. 1 is a longitudinal sectional view of a cap according to the present invention (a two-dot chain line indicates a writing instrument body). 2 to 4 sequentially show the AA line sectional view, the BB line sectional view, and the CC line sectional view of FIG. FIG. 5 is an external view showing the display unit 84 on the top surface of the cap of FIG. FIG. 6 is a half vertical sectional view showing a state before the inner cap 4 is attached. FIG. 7 is an explanatory diagram illustrating a process in which the inner cap 4 is attached.
[0015]
(The entire)
The cap 1 has a configuration in which an inner cap 4 for keeping airtightness is mounted inside the outer cap 2 from the front end opening of the outer cap 2. The outer cap 2 is a cylindrical body opened at both ends made of polypropylene resin injection molding, while the inner cap 4 is a bottomed cylindrical body made of polybutylene terephthalate resin injection molding.
[0016]
(Outer cap)
A locking projection 3 is integrally provided at an intermediate portion of the inner peripheral surface of the outer cap 2. The locking projection 3 has a tapered surface 31 formed on the front surface thereof so that the first flange portion 5 can smoothly ride over, and is perpendicular to the rear surface so that the front surface of the first flange portion 5 can be securely engaged. A surface is formed. In addition, although the said latching convex part 3 is cyclic | annular here, the some protrusion disperse | distributed by the circumferential shape may be sufficient.
[0017]
(Inner cap)
The inner cap 4 has a first flange 5 integrally formed in an annular shape on the outer peripheral surface of the opening end, and a second flange 6 is integrally formed in an annular shape on the outer peripheral surface of the closed end. It is preferable in terms of strength that the collar is a continuous ring. However, in addition to this, it may be discontinuous with notches, or a configuration in which a plurality of protrusions are distributed in a ring shape.
[0018]
(First part)
The outer diameter of the first flange 5 is such that the outer diameter of the locking projection 3 and the locking of the locking projection 3 are such that the first flange 5 can be fitted over the locking projection 3 (after being fitted over). It is set larger than the inner diameter of the inner peripheral surface of the outer cap 2 behind the convex portion 3. As a result, after the first collar portion 5 gets over the locking projection 3, its outer surface is brought into close contact with the inner peripheral surface of the outer cap 2, and at the same time, its front surface is engaged with the rear surface of the locking projection 3 in the front-rear direction. Combined.
[0019]
(2nd butt)
The outer diameter of the second flange portion 6 is set to be larger than the inner diameter of the front opening end of the outer cap 2 so that the rear surface thereof can come into contact with the front opening end surface (front end edge) of the outer cap 2. The Further, the second collar portion 6 only needs to be disposed on the closed side of the inner cap 4, and in addition to being provided at the closed end of the inner cap 4 of the present embodiment, the closed end (display portion 84) of the inner cap 4. ) May be provided behind the opening side.
[0020]
(Prevents damage to the nib)
A tapered surface 51 is formed on the inner peripheral surface of the opening end of the inner cap 4 (that is, the inner peripheral surface of the first flange 5), and the thickness of the opening end surface is thin. Further, the outer peripheral surface of the first flange portion 5 is in close contact with the inner peripheral surface of the outer cap 2 without a gap. Therefore, the user does not accidentally hit the pen tip against the inner cap 4 opening end surface or into the gap between the inner cap 4 opening end outer peripheral surface and the outer cap 2 inner peripheral surface. Does not damage the pen tip when worn.
[0021]
In addition, in this embodiment, the guide protrusion 21 is provided in an annular shape on the inner surface of the outer cap 2 in front of the locking projection 3 (in front of the first flange 5). The rear surface of the guide projection 21 is a tapered surface that guides the inserted pen tip while abutting the pen tip inward in the radial direction. The pen tip can be properly maintained over a long period of time without fear of hitting the pen tip against the opening end.
[0022]
(Large diameter part, small diameter part)
Between the first flange portion 5 and the second flange portion 6 of the inner cap 4 peripheral wall, a small diameter portion 8 that is not in contact with the inner surface of the outer cap 2 and a large diameter portion 7 that is fitted to the inner surface of the outer cap 2 are formed. Has been. The small-diameter portion 8 has a smaller diameter than the inner diameter of the outer cap 2 and is attached to the inner surface of the outer cap 2 in a non-contact state. Therefore, an annular space 9 is formed between the outer surface of the small diameter portion 8 and the inner surface of the outer cap 2. The large-diameter portion 7 has a cylindrical body provided with the second flange portion 6 at the front end of the outer peripheral surface thereof, and is provided on the outer peripheral surface of the closed end of the inner cap 4 from the rear end of the inner peripheral surface of the cylindrical body. In this configuration, the four connecting portions 73 are integrally connected.
[0023]
(Ventilation passage)
On the inner surface of the small diameter portion 8, an annular protrusion (that is, a seal portion 82) that is airtightly fitted to the writing instrument body is integrally formed. Further, two lateral holes 81 are provided at opposing positions on the peripheral wall of the small diameter portion 8 at the rear of the seal portion 82 and in front of the first flange portion 5. The large diameter portion 7 is provided with a vertical hole 71 extending in the axial direction. The vertical hole 71 includes a front annular hole (see FIG. 4) and four holes (see FIG. 2) divided by four connecting portions 73 at the rear end. The annular hole 9 communicates with the outside air in front of the cap 1 through the vertical hole 71, and the annular space 9 communicates with the inside of the inner cap 8 through the lateral hole 81. Thereby, an axial air passage is secured.
[0024]
(Non-rotating engagement)
On the outer peripheral surface (two locations at opposite positions) of the large-diameter portion 7 of the inner cap 4, uneven grooves 72 made of axial grooves or ribs are disposed. On the other hand, on the entire circumference of the inner peripheral surface of the front opening of the outer cap 2, there are provided the concave and convex strips 22 in the axial direction that mesh with the concave and convex strips 72 of the inner cap 4 (FIGS. 4, 6, and 7). reference). The engagement of the concave and convex strips 22 and 72 prevents the inner cap 4 from rotating relative to the outer cap 2. That is, when removing the cap 1 from the writing instrument main body, in addition to the pulling operation in the front-rear direction, the inner cap 4 together with the outer cap 2 can be rotated (twisted) with respect to the writing instrument main body. The fitting can be released with a relatively small force.
[0025]
(Internal cap installation process)
An enormous portion 83 is annularly formed in the small diameter portion 8 of the inner cap 4 (FIGS. 6 and 7). The enormous portion 83 functions as an insertion guide for the inner cap 4. That is, in the process of mounting the inner cap 4 in the outer cap 2, when the inner cap 4 is inserted from the opening end side of the outer cap 2 in order from the opening end side, the inner cap 4 large diameter portion 7 and the outer cap 4 Before the two inner surfaces are fitted, the enormous portion 83 is slid against the inner surface of the outer cap 2 (FIG. 7), so that the inner cap 4 can be smoothly inserted from the first flange portion 5 to the large diameter portion 7 without being caught. it can. Accordingly, in the actual assembly process, the inner cap 4 is inserted into the front opening of the outer cap 2 by its own weight only by inserting the inner cap 4 from the front opening of the outer cap 2 in the upward state (that is, the inner cap 4 is in an inner state). The fitting ready state between the large-diameter portion 7 of the cap 4 and the inner surface of the outer cap 2 is immediately possible. The enlarging portion 83 has an outer diameter smaller than that of the large-diameter portion 7, and is held in a non-contact state with the outer cap 2 in order to form the annular space 9 for ventilation.
[0026]
(Display section)
Further, the outer surface of the closed end of the inner cap 4 has a flat shape, and a display portion 84 (here, symbol F indicating the pen tip shape) indicating the pen tip shape, the pen tip size, the ink color, and the like is provided. It has been.
[0027]
(Applicable writing instruments, etc.)
The cap of the present invention can be applied to, for example, a writing instrument such as a marking pen, a sign pen, a ballpoint pen, a pipe pen, and a fountain pen, or an applicator such as a correction liquid, a cosmetic liquid, and an adhesive.
[0028]
【The invention's effect】
The present invention makes it easy to attach the inner cap to the outer cap and at the same time makes the attachment state of the inner cap and the outer cap strong and does not wobble. It is possible to provide a cap such as a writing instrument having a simple structure that does not enter the gap between the inner cap and the outer cap. Moreover, the cap provided with the said structure can be easily used as a ventilation cap.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
4 is a cross-sectional view taken along the line CC in FIG. 1. FIG.
FIG. 5 is an external view showing a cap top portion of FIG. 1;
6 is a half vertical cross-sectional view showing a state before the inner cap of FIG. 1 is attached. FIG.
7 is an explanatory view showing a process of attaching the inner cap of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cap 2 Outer cap 21 Guide protrusion 22 Concavity and convexity 3 Locking convex part 31 Tapered surface 4 Inner cap 5 First collar part 51 Tapered surface 6 Second collar part 7 Large diameter part 71 Vertical hole 72 Concavity and convexity 73 Linking part 8 Small diameter Part 81 side hole 82 seal part 83 enormous part 84 display part 9 annular space

Claims (3)

A cap for a writing instrument or the like having a synthetic resin inner cap (4) having one end opened and the other end closed in a synthetic resin outer cap (2) having both ends opened, the inner cap A first flange (5) is integrally provided on the outer surface of the open end of (4), and a locking projection (3) is integrally provided on the inner surface of the outer cap (2), and the first flange (5) and The engagement protrusion (3) is passed over and fitted, and a second flange (6) is integrally provided on the outer surface of the inner cap (4) on the closing side, and the second flange (6) is provided. A cap for a writing instrument or the like, wherein the cap is brought into contact with the front opening end of the outer cap (2). A large diameter part (7) is provided on the closed side of the outer surface of the inner cap (4) between the first collar part (5) and the second collar part (6), and a small diameter part (8) is provided on the opening side. A cap for a writing instrument or the like according to claim 1, wherein the diameter portion (7) is fitted to the inner surface of the outer cap (2). An annular space (9) is provided between the outer surface of the small diameter portion (8) and the inner surface of the outer cap (2), and an annular seal portion (82) is provided on the inner surface of the small diameter portion (8) for airtight fitting with the writing instrument body. Furthermore, a lateral hole (81) for communicating the annular space (9) and the inside of the cap (1) is provided through the peripheral wall of the small diameter portion (8) behind the seal portion (82), and the large diameter portion A cap for a writing instrument or the like according to claim 2, wherein a vertical hole (71) is provided through (7) for communicating the annular space (9) with the outside.

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