JP4516646B2 - Writing instrument cap - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a writing instrument cap, and more particularly to a writing instrument cap comprising an inner cap, a middle cap, and an outer cap for reducing a pressure change inside the cap when the cap is attached and detached.
[0002]
[Prior art]
Conventionally, various problems have occurred with respect to pressure changes inside the cap when the cap is attached and detached. In particular, in writing instruments such as a sign pen and a ballpoint pen that have liquid ink having a comb-like ink supply member arranged at the rear, the comb-like ink supply tool is vulnerable to air compression and decompression, ink ejection, and leakage. It is the cause. In most cases, the cap is fitted into the pen tip in order to seal the pen tip. In order to seal the cap and the pen tip with this press fit, the pen tip and the cap must be attached. When pressed and press-fitted, since one of the caps is a closed end, the gas in the cap is compressed, and the pressure in the writing instrument and the cap is increased.
[0003]
Further, when the cap is removed, the pressure change in the cap is generated and removed as opposed to the compression at the time of mounting. Then, since the cap is removed from the writing instrument body, the volume in the cap increases, which suddenly reduces the pressure, sucks ink in the direction of the pen tip, and ejects ink and excessive ink to the pen core. The inflow causes ink bleed or ink droplets at the time of writing, resulting in soiling of the writing object.
[0004]
In order to prevent such a situation, Japanese Utility Model Publication No. 56-21584 (hereinafter referred to as (A)), Japanese Utility Model Application Publication No. 59-136708 (hereinafter referred to as (B)), Japanese Utility Model Application Publication No. 62-154848. No. (hereinafter referred to as (C)) and Japanese Utility Model Publication No. 6-45779 (hereinafter referred to as (D)). In addition, Japanese Laid-Open Patent Application No. 60-84544 (hereinafter referred to as (e)) and Japanese Patent Application Laid-Open No. 7-290882 (hereinafter referred to as (f)) are devised not considering the pressure when the cap is attached. .
[0005]
(A) has an outer cap and an inner cap, and an air circulation hole is provided on the side opposite to the opening end of the inner cap, and the air circulation hole is closed and opened by packing by sliding back and forth of the inner cap. Therefore, (a) uses a packing and therefore has a different configuration from the present invention. In addition, there is a problem with the durability of the packing due to the time and temperature. Furthermore, the number of parts increases and it becomes difficult to assemble.
[0006]
(B) is a liquid cosmetic applicator that presses against the center hole of the head to ensure airtightness, but keeps the main body airtight in the same direction as inserting and removing from the cap. The above-mentioned problem occurs as a result of sucking ink when the air is compressed or removed.
[0007]
(C) When the pen nib body is installed with two outward air passage tubes and an inward air passage tube on the side opposite to the opening end of the cap, compressed air from the outer air passage tube is sent to the outside. Extrude. Further, the space inside the cap is brought into the same state as the outside by sucking and exhausting air through the two air passage pipes depending on temperature and atmospheric pressure. Furthermore, when the cap is removed, the inward air passage tube acts to prevent pressure reduction due to suction of the space inside the cap, but it is not easy to provide a valve at the tip of such a cap. Not only is the top complicated, but it is difficult to design a small cap. This also increases costs.
[0008]
(D) closes the ventilation hole provided on the top surface of the cap with an elastic seal in accordance with the cap mounting operation of the writing instrument body, and the direction in which the elastic seal closes the ventilation hole and the direction in which the writing instrument body is inserted are the same. It is on a straight line. Therefore, since the writing tool body is inserted toward the cap after the vent hole is slightly blocked, the air in the cap is compressed. When removing the cap, first, the main body moves and then the packing is separated from the vent hole, so that air is slightly sucked. Therefore, even in the configuration (d), it is impossible to keep the air pressure inside the cap constant by attaching and detaching the cap, and it is obvious that the configuration is particularly different from the present invention.
[0009]
(E) prevents the drying of the nib by allowing the ink vapor to pass through the porous body in the upper part of the cap by penetrating a hole provided on the peripheral surface for preventing the drying. When the writing instrument body is not attached to the cap, the hole provided on the peripheral surface is closed to prevent evaporation of the ink impregnated in the porous body provided at the tip of the cap. Therefore, the present invention is different from the object and configuration.
[0010]
(F) is intended to protect the pen core when the cap is attached. Therefore, the inner cap moves when the writing instrument body is attached to the cap. However, since the inner cap has no air pressure adjustment structure, the inner cap is attached while the pressure of the inner cap is compressed. Therefore, the problem of the present invention is not a solved structure, and is completely different from the present invention.
[0011]
As described above, air compression in the cap when the writing instrument body and the cap are attached, and air decompression in the cap when the cap is removed, which are problems in the past, cause ink ejection and the pen core. Bleeding ink droplets are generated due to excessive inflow of ink, and the writing object is soiled.
[0012]
[Problems to be solved by the invention]
As described above, the pen tip provided at the tip of the writing instrument by compressing or depressurizing the air inside the cap, especially when preventing the drying of the pen core at the tip of the writing instrument, when the cap and the writing instrument main body are attached and detached. Ink flow into the ink is excessive, causing ink to splatter and squirt when the cap is removed, and to cause writing due to excessive ink at the time of writing and smearing of the writing object due to ink droplets.
[0013]
To solve this the problem, the writing instrument body without causing pressure increase in the cap which requires airtight when detaching the cap to the final state of the gas-tight seal, furthermore, the cap also when removing the cap A cap that does not depressurize the pressure is provided. In addition, a writing instrument designed for conventional caps that can be used to temporarily secure air circulation in the throat even when an infant accidentally swallows a cap, is easy to create on the mold, and has cost merit. A cap is provided.
[0014]
[Means for Solving the Problems]
A bottomed cylindrical outer cap with one open end or an outer cap with a head cap fixed to the upper open end, a middle cap disposed therein, and an inner cap disposed further inside A writing instrument cap provided,
The outer cap provided with an air circulation hole on the top surface and further provided with a support guide piece provided with a window on the top surface;
The inner cap provided with a support guide receiving portion provided with an air hole penetrating the outer peripheral surface and the inner peripheral surface on the peripheral surface, and further provided with a claw on the top surface;
A weakly elastic member is disposed between the window and the claw is inserted into the window, and the support guide receiving portion is slidably guided to elastically support the outer cap and the inner cap.
A writing instrument cap comprising: an inner cap having the same number of plug projections as the air holes on an inner peripheral surface, and a strong elastic member disposed between an upper end surface and the top surface of the outer cap.
[0015]
[0016]
【Example】
A first embodiment of the present invention will be described in more detail with reference to FIGS. 1, 2, 3, 4, 5, 6, and 7. FIG.
[0017]
Reference numeral 1 denotes an outer cap which has a bottomed cylindrical shape with one open end, and is provided with an air circulation hole 3 through which air can effectively flow between the outside air and the inside of the cap when the cap is swallowed. Yes. Further, a cylindrical support guide piece 2 on which the inner cap 5 can slide up and down is stretched on the bottomed side. A guide groove 4 is provided on the inner peripheral surface of the outer cap 1 so that the inner cap 5 can slide up and down. The guide groove 4 is provided at two locations as shown in the figure, but the number thereof is not limited. Further, although not shown in the figure, a protrusion for click fitting with the writing instrument body may be provided. By doing so, it is possible to increase the fit when the cap is attached to the main body. The support guide piece 2 has a cylindrical shape, but it is intended by the present invention whether it is a square shape or just a piece. At this time, the shape of the support guide receiving portion 7 provided in the inner cap 5 also corresponds to the support guide piece 2.
[0018]
As described above, reference numeral 5 denotes an inner cap, one of which has an open end and the other of which has a bottomed cylindrical shape, and an air hole 6 penetrating the outer peripheral surface and the inner peripheral surface is provided on the peripheral surface. Although two to four air holes 6 are provided in the figure, any number may be used as long as it is one or more. A support guide receiving portion 7 is provided above the inner cap 5. Further, an airtight ring 8 is provided at the open end, and is detachably airtightly fitted to the tip portion of the writing instrument body. The internal cap 5 top and a weak elastic member 9 on the bottom inner wall of the outer cap 1 to abut the support of the inner cap 5 is supported resiliently. Weak elastic member 9, a coil spring or leaf spring or the like, the shape and type does not matter as long as the resilient force is located resilient be supported.
[0019]
Further, the same number of sliding grooves 16 as the stopper protrusions 12 are provided on the outer peripheral surface of the inner cap 5 so that the stopper protrusions 12 come into contact with and slide. The sliding groove 16 is provided with an air hole 6 on the upper side and a stopper 17 on the lower side to restrict the downward movement of the middle cap 10. The upper limit of the middle cap 10 can be limited so that the bottomed portion (the upper portion from the air hole 6) of the inner cap 5 has a large diameter. Further, by providing the sliding groove 16, the stopper protrusion 12 of the middle cap 10 is reliably guided to the air hole 6, and the stopper protrusion 12 and the air hole 6 are detachably and airtightly held.
[0020]
Reference numeral 10 denotes an intermediate cap, which has a cylindrical shape and is provided with the same number of plug protrusions 12 as the air holes 6 on the inner peripheral surface for closing the air holes 6 of the inner cap. It is provided in parallel to the axis. A strong elastic member 13 is brought into contact with the upper end of the middle cap 10 and is elastically supported downward. When the writing instrument main body is mounted, the opening end of the strong elastic member 13 is pressed by the pressing end 14 of the writing instrument main body. It is pushed forward against the force. On the outer peripheral surface of the middle cap 10 are provided guide grooves 4 provided on the inner peripheral surface of the outer cap 1 and guide ribs 15 that are slidable up and down.
[0021]
The guide groove 4 and the guide rib 15 are slidable in the same number. In this way, the middle cap 10 can stably slide up and down by the guide groove 4 and the guide rib 15. Since the guide groove 4 and the guide rib 15 are used as guide members, the present invention intends whether the guide groove 4 and the guide rib 15 are provided on either the middle cap 10 or the outer cap 1. Here, the shape and type of the strong elastic member 13 are not limited as long as the strong elastic member 13 has an elastic force such as a coil spring or a leaf spring like the weak elastic member 9 described above. However, the resilient force of the two of the resilient member, may be a relationship between the weak elastic member 9 <strong resilient member 13.
[0022]
Reference numeral 18 denotes a writing instrument body, and the tip of the writing instrument body is tapered so as to be kept airtight with the airtight ring 8. In addition, a pressing end 14 is provided in contact with the lower end surface of the middle cap 10 to press the middle cap 10 upward.
[0023]
In the embodiment of the present invention, air flow and operation when the cap is attached and detached will be described. When the writing instrument main body is removed, the air flow is such that the middle cap 10 is ejected downward by the strong elastic member 13, is located at the lowest point by the stopper 17, and the plug protrusion 12 is the air in the inner cap 5. It is located on the opening end side (downward position) of the outer cap 1 with respect to the hole 6. At this time, the inner cap 5 is also positioned at a position below the lowest point by the elastic force of the weak elastic member 9.
[0024]
Even if the infant accidentally swallows the cap in this state, the air circulation hole 3 is provided on the top surface of the outer cap 1, so that air passes through the air circulation hole 3 and further into the inner cap 5. Air flows between the air hole 6 provided, the outer wall surface of the middle cap 10 and the inner wall surface of the outer cap 1, and flows to the open end of the outer cap 1. Thus, it is possible to secure an air flow passage.
[0025]
When the cap of the present invention is mounted on the writing instrument body 18, first, the pressing end 14 of the writing instrument body 18 presses the lower end surface of the middle cap 10 upward against the elastic force of the strong elastic member 13. Keep it in position. The tip of the writing instrument body 12 to close the cap mounting completion pressed contact to the cap 5 in an airtight ring 8 is pushed upward against the elastic force of the weak spring member 9, the lower end of the supporting guide strip 2 And can slide upward until it comes into contact with the bottomed upper surface of the inner cap 5. And just before it becomes completely airtight at this time. Further, at this time, the internal space A of the inner cap 5 is compressed, but the air hole 6 is not yet closed, so the compressed air flows out from the air hole 6, and the air circulation hole 3 or the middle cap 10. It is discharged through the gap in the outer cap 1. The upper sliding restriction of the inner cap 5 can be restricted by the lower end of the support guide piece 2 and the bottomed upper surface of the inner cap 5, and the upper end of the support guide receiving portion 7 and the outer cap 1. It can be regulated by contacting the bottomed inner wall or the top wall of the head plug 19.
[0026]
Further, when the writing instrument body 18 is inserted into the cap, the lower opening end of the middle cap 10 is pressed forward, and the airtight ring 8 and the writing instrument body 18 are securely kept airtight. The upward sliding movement of the cap 5 stops, and the air hole 6 is closed while the plug projection 12 is completely airtight. Since the air hole 6 and the plug protrusion 12 allow air to flow and discharge until just before the cap mounting position, the compressed air is completely discharged out of the inner cap 5 and in a stable state without compressed air. The inside of the cap can be maintained. This is because the member that is airtight with the writing instrument body 18 is not collinear with the axis, that is, is provided in a parallel line with respect to the axis.
[0027]
The state of removing the cap from the writing instrument body 18 moves downward because the middle cap 10 is in contact with the pressing end 14 of the writing instrument body 18 by the elastic member 13 simultaneously with the movement of pulling out the writing instrument body 18. Then, the sealing of the plug projection 12 and the air hole 6 is released simultaneously with the downward movement of the writing instrument body, and air flows into the internal space A from the outside of the inner cap 5 . Thus, since the air hole 6 and the plug projection 12 are released at the same time as the internal space A of the inner cap 5 changes, the internal space A is not decompressed. This is because the relationship of the resilient force of the weak elastic member 9 and the strength resilient member 13 is a strong resilient member 13> a little less than resilient member 9.
[0028]
Accordingly, since ink is not sucked out due to reduced pressure, excessive ink inflow to the ink supply tool and the pen core does not occur, so that ink droplets and ink are not ejected. Further, when the cap is removed from the writing instrument body 18, the stopper projection 12 of the middle cap 10 is locked to the stopper 17, and at the same time, the support guide receiving portion 7 is slidably supported by the support guide piece 2, and the inner cap 5 is also moved downward. Be positioned.
[0029]
Furthermore, even if the infant has swallowed the cap of the present invention, the air trajectory can be temporarily secured. Regarding the material, the outer cap 1, the middle cap 10, and the inner cap 5 can be selected from a thermoplastic resin and a thermosetting resin, but the inner cap 5 is made of a softer material than the outer cap 1 and the middle cap 10. It is good.
[0030]
As the second embodiment of the present invention, the upper portion of the outer cap 111 can be provided as the head plug 19. Reference numeral 19 denotes a head plug, which is fixed so as not to drop off, such as click fitting (not shown) with the upper opening end of the outer cap 111. Several air flow holes 3 are provided on the outer end of the support guide piece 222 at the upper end of the head plug 19, and the support guide piece 222 is integrally extended below the support guide piece 222. Are provided with at least one pair of opposed windows 20. At least one pair of support guide receiving portions 777 facing each other is provided on the upper portion of the inner cap 555, and claws 21 are provided on the inner wall surface of the support guide receiving portion 777. 21 is locked so that it can slide up and down. Here, the same number of windows 20 and claws 21 are provided.
[0031]
Also, the window 20 to the weak resilient inner member 9 by respective contact with the upper surface of the inner bottom side of the inner top panel and the support induction receiving portion 777 of the support guide strip 222 cap before mounting the pawl 21 555 I support the bullet. Thus Atamasen 19 and the inner cap 555, and cap assembly and easy to handle in the present invention by an intermediate part assembled weak elastic member 9. Other than the above, the constituent members are the same as those of the first embodiment.
[0032]
The order of assembly of components used in the second embodiment of the present invention, the inner cap 555 and Atamasen 19 weak elastic member 9 is abutment support, as the window 20 and the pawl 21 are engaged with each other Assemble. The intermediate member assembled in this way is fitted and fixed to a click fitting portion (not shown in the drawing) provided at the upper opening end of the outer cap 111. Next, the strong bullet member 13 is disposed between the outer cap 111 and the inner cap 555, one end of the strong bullet member 13 is abutted and supported on the top wall of the head plug, and the other end is fixed to the middle cap 10. The middle cap 10 is elastically supported by abutting and supporting the upper end of the inner cap 10.
[0033]
Then, the cap projection 12 and the sliding groove 16 are aligned, the middle cap 10 is pushed against the resilient force of the strong resilient member 13, and the middle cap 10 is pushed until the stopper projection 12 gets over the stopper 17. This completes the assembly of the middle cap 10. This completes it. The material of the parts used in the first and second embodiments of the present invention is that the inner cap 10 having the plug protrusion 12 and the inner cap 5 having the air holes 6 are either softer than the other. For example, selection from thermoplastic resins such as polypropylene, acrylic and polyethylene, and thermosetting resins is free.
[0034]
Thus, since the pressure change of the internal space A does not occur, excessive supply of ink from the ink chamber behind the writing instrument body to the ink occlusion body or the comb-like ink supply tool is prevented. Therefore, when the cap and the writing instrument body are attached and detached from the past, the pen core at the tip of the writing instrument, particularly the pen core at the tip of the writing instrument, is prevented from drying and the air in the cap is compressed or decompressed to the pen tip provided at the tip of the writing instrument. It is possible to prevent ink from splashing and ejecting when removing the cap by excessive ink inflow, and bleeding due to excess ink during writing and smearing of the writing object due to ink droplets. Further, the assembled intermediate assembly is convenient to handle and easy to assemble.
[0035]
【effect】
Since it is such a structure, when attaching a writing instrument main body to a cap, the pressure increase in a cap which requires airtightness does not arise to the final state of airtight maintenance, and also the pressure in a cap is reduced when removing a cap. This eliminates the excessive inflow of the ink into the pen core and the ink supply tool, and enables a cap for a writing tool that does not generate ink droplets. Furthermore, since the elastic member is provided in double, the sliding of the inner cap 5 and the sliding of the middle cap 10 can be easily controlled. A cap for writing instruments that is designed for conventional caps and that can provide a cap that can temporarily secure air circulation in the throat even when an infant accidentally swallows the cap, making it easy to assemble and mold on the mold, and has a cost advantage Is possible.
[0036]
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of the embodiment of the present invention when the cap is mounted. FIG. 2 is a schematic cross-sectional view of the embodiment of the present invention when the cap is detached. FIG. Sectional view [Fig. 4] Bottom view of cap of embodiment of the present invention [Fig. 5] Top view of cap of embodiment of the present invention [Fig. 6] Exploded view of cap of embodiment of the present invention [Fig. 7] Implementation of the present invention Sectional view when cap is removed with head cap 19 on outer cap of example
1: the outer cap 2: the supporting guide strip 3: air circulation holes 4: guide grooves 5: inner cap 6: air vent 7: support induction receiving portion 8: airtight ring 9: Weak elastic member 10: Medium Cap 12: stopper protrusion 13: Strongly resilient member 14: Pressing end 15: Guide rib 16: Sliding groove 17: Stopper 18: Writing instrument body 19: Head plug 20: Window 21: Nail

Claims (1)

A bottomed cylindrical outer cap with one open end or an outer cap with a head cap fixed to the upper open end, a middle cap disposed therein, and an inner cap disposed further inside A writing instrument cap provided,
  The outer cap provided with an air circulation hole on the top surface and further provided with a support guide piece provided with a window on the top surface;
  The inner cap provided with an air hole penetrating the outer peripheral surface and the inner peripheral surface on the peripheral surface, and further provided with a support guide receiving portion provided with a claw on the top surface;
  A weakly elastic member is disposed between the window and the claw is inserted into the window, and the support guide receiving portion is slidably guided to elastically support the outer cap and the inner cap.
  A writing instrument cap comprising: an inner cap having the same number of plug projections as the air holes on an inner peripheral surface, and a strong elastic member disposed between an upper end surface and the top surface of the outer cap.

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