JPH03175094A - Writing instrument - Google Patents

Abstract

PURPOSE:To seal a writing liquid in a writing device hermetically and reduce a load acting upon the tip of a writing shaft when the shaft is fed out by installing a cylinder and a blocking element so that they attract each other magnetically and energizing the blocking element to a position where the cylinder attracts the cylinder, utilizing the elastic restoration force of a connecting member. CONSTITUTION:If a refill 14 is squeezed out from a tip direction by knocking operation, a blocking element 22 is pushed by the tip of the refill 14 and becomes upright, thus allowing the refill 14 to become ready for use. As the connecting part 242 of a connecting member 24 becomes deformed significantly, a load rests on a writing element 143 due to an elastic restoration force when the refill 14 is projected. However, the load is minimum and therefore the writing element 143 is protected against damage. After use, the refill 14 is returned to a storage position again by knocking operation. The blocking element 22 is returned to a position where it gets close to the tip surface of a cylinder 18 by the elastic restoration force of the connecting member 24, and is magnetically attracted by the cylinder 18. Then the blocking element 22 is closely fixed to the tip surface and its interior is sealed hermetically. The vapor supplied to an airtight chamber in the cylinder 18 from an ink occlusion element 145 is prevented from becoming dry.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to writing instruments including marking pens such as ballpoint pens, sign pens, plastic pens, paint markers, and even cosmetic applicators.

(Prior Art) In conventional writing instruments, the writing fluid is prevented from drying by sealing the tip with a cap when not in use. However, this kind of cap type has poor work efficiency,
In addition, there is a risk of losing the cap, so in recent years, writing instruments have been developed that eliminate the need for the cap by automatically closing the tip when not in use.

For example, Utility Model Publication No. 42-21538 and Utility Model Application Publication No. 62-
No. 87882 discloses a structure in which a cylindrical body made of a magnet is provided at the distal end portion of the main body, and the distal end of a writing shaft such as a fountain pen nib or a ballpoint pen refill emerges and retracts from a through hole of the cylindrical body toward the distal end. At the same time, when the tip of the writing shaft is sunk, a ball-shaped or plate-shaped blocking body is magnetically attracted to the tip side surface of the cylinder, so that the blocking body closes the through hole. What has been done is shown. According to this structure, even without using a cap etc.
The writing liquid inside the writing instrument is automatically sealed by the closing body.

In addition, Publication of Utility Model Publication No. 38-18620 and Publication of Utility Model Publication No. 41-1
Publication No. 3855 discloses a device in which the above-mentioned closure body and cylinder body are connected by an elastic member, and the closure body is pressed against the distal end surface of the cylinder body by the elastic force of the elastic member, and sealing is achieved by pressure contact between the two. It is shown.

[Problem to be solved by the invention]

The above-mentioned Utility Model Publication No. 42-21538 and Utility Model Application Publication No. 62-87
In the writing instrument described in Publication No. 882, the closing body is attracted to the cylinder only by the magnetic force of the cylinder, so when the tip of the writing shaft protrudes toward the tip, the closing body rises by more than 900 degrees. In some cases, such as when the writing shaft is pulled back to the storage position with the writing instrument facing downward, the closing body may not be able to return to the original closing position, resulting in incomplete sealing. In particular, when the writing shaft is extended with the tip of the writing instrument facing downward, there is a risk that the closing body separated from the barrel may block the opening at the tip of the writing instrument, which may prevent the tip of the writing shaft from protruding. If the tip of the writing shaft is forced to protrude, a large load will be applied to the tip, which may lead to damage.

On the other hand, Publication No. 38-18620 and Publication No. 41-1 of Utility Model
In the writing instrument of Publication No. 3855, the closing body is pressed against the cylindrical body by the elastic restoring force of the elastic member, so in order to completely seal the writing instrument, the elastic member must have a fairly strong elastic restoring force. required. Therefore, with this structure, there is a large resistance due to the elastic member when the tip of the writing shaft protrudes.
Further, this resistance increases as the elastic member becomes more deformed, and therefore a large load is applied to the tip of the writing instrument, resulting in the inconvenience of damaging the pen tip or the like. On the other hand, if the elastic return force is weak, the inside of the writing instrument will not be completely sealed, and the vapor pressure in the chamber where the tip of the writing shaft is stored will not be maintained well, resulting in evaporation from the tip of the writing shaft. This has the disadvantage of causing smearing and the like.

In view of these circumstances, the present invention provides a writing instrument that can reliably seal the writing fluid inside the writing instrument when the writing shaft is stored, and that has a small load acting on the tip when the writing shaft is extended. The purpose is to

[Means to solve the problem]

The present invention provides a cylindrical body having a through hole in the axial direction of a writing instrument, a writing shaft inserted into the through hole of the cylindrical body so as to be able to protrude and retract from the distal end surface of the cylindrical body, and In a writing instrument equipped with a closing body formed in a shape to close a distal opening, at least the distal end portion of the cylindrical body and the closing body are formed of a magnetic material, and at least one of these is formed of a magnet, so that the other The closing body is configured such that the closing body is in a position where the closing body closes the opening on the distal side of the through hole of the cylinder body, and the opening on the distal side is opened to move the writing shaft toward the distal side. It is equipped with a connecting member that is connected to the cylindrical body so as to be movable between the protruding position and the cylindrical body, and that urges the closing body in a direction toward the cylindrical body to a position where the suction force of the cylindrical body is exerted. .

(Function) In the above configuration, first, when the writing shaft is housed in the cylinder, the closing body is magnetically attracted to the distal end surface of the cylinder, so that the closing body draws the writing shaft toward the distal end of the cylinder. The opening is closed and the seal is maintained.

By protruding the writing shaft toward the tip from this state, the closing body is pushed away from the cylindrical body by being pushed by the tip of the writing shaft.
The writing instrument becomes ready for writing. At this time, since the closing body is connected to the cylindrical body via the elastic member, it will not separate from the cylindrical body and fall to an inconvenient position. On the other hand, the connecting member only needs to have enough elasticity to urge the closing body to a position near the cylindrical body, and compared to a writing instrument in which the closing body is pressed against the cylindrical body by the elastic force of the connecting member, the writing shaft protrudes. The load placed on the tip of the writing shaft is small.

In addition, by storing the writing instrument in the cylinder from this state, the elastic restoring force of the elastic member returns the closing body to a position near the cylinder, and the suction force of the cylinder returns it to a position where it closes the opening on the distal end side. Fixed.

〔Example〕

A first embodiment of the present invention will be described based on FIGS. 1 to 4.

The writing instrument shown here includes a main body container 10 made of synthetic resin or the like, and a tip opening 1 on the front end side of the main body container 10.
2 is provided, and inside the main body container 10,
A refill (shaft i) 14 is housed so as to be movable in the axial direction. This refill 14 consists of a relatively small-diameter distal shaft 141 and a large-diameter tail-end shaft 142, and a writing body 143 is provided at the distal end of the distal shaft 141.

As shown in FIG. 2, the writing body 143 has an ink absorbing body housed in the tail end shaft 142 via a small diameter portion 144 extending coaxially with the tip end shaft 141.
145.

On the other hand, a cylindrical body 18 made of a magnetic material such as stainless steel is fitted and fixed at a position on the front end side of the main body container 10 . This cylindrical body 18 consists of a small diameter part 181 located at the tip side (upper side in FIGS. 1 to 3) and a large diameter part 182 located at the tail end, and the center A through hole 183 extending in the axial direction of the writing instrument is formed in the portion.

The distal end shaft 141 is inserted into the through hole 183 of the cylindrical body 18 so as to be retractable from the distal end surface (upper end surface in FIG. 1) of the cylindrical body 18, and an O-ring is attached to the inner surface of the solid body 18. A sealing member 16 made of the like is fixed, and the through hole 183 in the cylindrical body 18 is kept sealed by contact between the sealing member 16 and the distal end shaft 141.

Further, a compression spring 20 is provided between the tail end surface of the cylindrical body 18 and the tip end surface of the tail end side shaft 142 for urging the refill 14 toward the tail end side. The tail end portion of the refill 14 is connected to a knocking mechanism (not shown), and by the knocking operation, the tip of the refill 14 is retracted into the cylindrical body 18 as shown in FIG. and the refill 1 storage position as shown in the same figure (b).
The distal end portions of 4 are alternately locked at protruding positions that protrude outward from the distal end opening 12.

Further, in this writing instrument, a closing body 22 made of a magnet is connected to the distal end portion of the cylindrical body 18 via a connecting member 24 made of an elastic material such as rubber. This closure body 22
consists of a cylindrical upper part 221 and a lower part 222 that tapers downward from this upper part 221.
2 has a bottom shape larger than the through hole 183,
It is set so that the opening on the tip side of the through hole 183 can be completely closed. Further, a recess 223 is formed on the bottom surface, which substantially matches the through hole 183.

The connecting member 24 has a large-diameter cylindrical lower fitting part 241, and the connecting part 24 is formed on a part of the upper surface of this lower fitting part 241.
Small diameter cylindrical upper l1il through 2! The lower fitting portion 241 is connected to the small diameter portion 18 of the cylindrical body 18.
1 and the upper part 221 of the closure body 22 is fitted into the upper fitting part 243, so that the closure body 22 is fitted into the cylinder body 18.
is connected to.

As shown in FIG. 4, the connecting portion 242 includes an upwardly extending portion 244 extending upward from the upper end surface of the lower fitting portion 241;
Inner lower part 2 extending inward from the upper end of this upper extension part 244
45, and an upper fitting part 243 is connected to the inner end of this inner lower part 245. Further, a tapered surface is formed at a corner 246 which is a boundary between the upper extension part 244 and the inner lower part 245, and when the connecting part 242 bends and stretches at this corner 246, the closure body 22 Between the sealed position where the opening on the distal end side of the through hole 183 of the cylinder body 18 is closed, as shown in Figure (a), and the position where it is separated from the distal end surface of the cylinder body 18, as shown in Figure (b). can be moved. Further, the corner portion 246 is formed so that the angle formed by the upper extension portion 244 and the inner lower portion 245 is approximately a right angle when no external force is applied, and the elastic return force of the corner portion 246 causes the closure body 22 to be cylindrical. The position near the tip surface of the body 18, that is, the cylindrical body 1
8 in a direction toward the cylinder 18 to a position where it can be magnetically attracted.

On the other hand, as shown in FIG. 2, an air flow port 147 is provided in the side wall of the distal end of the distal end shaft 141 of the refill 14, which communicates between the inside and the outside, and the refill 14 is in the storage position shown in the figure. The storage space of the ink storage body 145 in the Ref beer 14 is sealed by the sealing member 16 and the closing body 22 via this air flow port 147 and the air passage 146 formed around the ink core 144. The closed chamber in the cylindrical body 18 is communicated with the closed chamber.

Next, the function of this writing instrument will be explained.

First, when the refill 14 is locked in the storage position as shown in FIG. 3(a), the closing body 22
The cylinder body 18 is fixed in a position where it closes the through hole 183 by being sucked by the cylinder body 18, thereby maintaining the sealing inside the through hole 183 in the cylinder body 18.

When the refill 14 is pushed toward the distal end by performing a knocking operation or the like from this state, the closing body 22 is pushed by the distal end of the refill 14 (writing body 143), so that it becomes an upright state as shown in FIG. 3(b). The reflex peel 14 itself is also locked at this protruding position and becomes ready for use. At this time, the connecting portion 242 of the connecting member 24 is
4 and the inner proof part 245 is greatly deformed from the natural state where it is approximately a right angle, the closing body 22 is urged to return to its original position by its elastic return force, and due to this urging force, the closing body 22 is urged to return to its original position. When protruding the refill 14, the cursive 14
3, but the elastic return force of the connecting member 24 is limited to the force that urges the closing body 22 to a position near the distal end surface of the cylindrical body 18. Therefore, the elastic returning force of the connecting member 24 does not occur as in the conventional case. Compared to a structure in which the closing body 22 is brought into pressure contact with the cylindrical body 18 by force, the above-mentioned load is small, and damage to the writing body 143 can be prevented.

On the other hand, after use, the refill 14 is returned to the storage position by performing a knocking operation or the like again. As a result, the closing body 22 is first moved to the cylindrical body 1 by the elastic return force of the connecting member 24.
8, and is further magnetically attracted by this cylinder 18, so that the cylinder 18
is closely fixed to the distal end surface of the through hole 183 to close the distal opening of the through hole 183 and seal the inside thereof. Such sealing prevents the steam supplied from the ink storage body 145 to the closed chamber inside the cylinder 18 from drying.

As described above, according to this writing instrument, by magnetically adhering the closing body 22 to the cylindrical body 18, the inside of the through hole 183 in the cylindrical body 18 can be sealed, and the closing body 22 and the cylindrical body 18 can be sealed. By connecting these with the connecting member 24, the movement position of the closure body 22 can be appropriately regulated. In addition, since the elastic return force of the connecting member is relatively small, the load acting on the writing body 143 when the refill 14 is projected is small, so that damage to the writing body 143 and the like can be prevented.

Furthermore, as shown in this embodiment, a recess 223 is provided at an appropriate location of the closure body 22, and the writing body 143 is placed in the recess 223.
In this case, there is an advantage that writing liquid can be prevented from adhering to the sealing portion, that is, the peripheral edge of the recessed portion 223, and deterioration of the sealing effect.

Next, a second embodiment will be described based on FIG. 5 (a>(b)).

Here, a rigid ball made of a magnet is used as the closure body 22, and a tapered surface 184 (FIG. 5 (b)) is formed at the distal end side peripheral edge of the through hole 183 of the cylindrical body 18, and this tapered surface 184 and the closure By contacting the body 22, the inside of the through hole 183 of the cylindrical body 18 is sealed.As shown in this embodiment, in the present invention, the structure of the writing instrument can be used regardless of the shape of the closing body. It may be set appropriately depending on the situation.

Next, a third embodiment will be described based on FIGS. 6(a) and 7(b).

Here, the lower fitting portion 241 of the connecting member 24 in the second embodiment is formed into a cap shape having a top wall 247, and the lower fitting portion 241 is configured to cover the small diameter portion 181 of the cylindrical body 18. It is fitted. In addition, the ceiling wall 24
A through hole 248 that matches the through hole 183 of the cylindrical body 18 is formed in the center of the cylindrical body 18 , and the contact between the tapered surface formed at the peripheral edge of the through hole 248 and the closing body 22 causes the cylindrical body 18 to close. The inside of the through hole 183 is sealed.

According to such a structure, the closing body 22 is attracted to the cylindrical body 18 by the magnetic force transmitted through the top wall 247, and the cylindrical body 18 and the top wall 247 are brought into close contact with each other by this attraction force, so that the cylindrical body 1
The inside of the through hole 183 at 8 is sealed. As shown in this embodiment, the present invention does not care about the specific shape of the connecting member, and there is no particular need for direct contact between the closing body and the cylindrical body.

In particular, as in this embodiment, if the relatively flexible top wall 247 of the connecting member 24 and the closure body 22 are brought into contact with each other when the refill 14 is in the storage position, the sealing performance can be further improved. be. The wall thickness of the top wall 247 in this embodiment may be set to be thin enough to allow the magnetic force of the closure body 22 to reach the cylinder body 18.

Next, a fourth embodiment will be described based on FIGS. 8(a) and 9(b).

Here, the lower fitting part 241' of the connecting member 24 is formed into a rod shape or a plate shape, and is fitted between the outer wall of the small diameter part 181 of the cylinder 18 and the inner wall of the main body container 10, and the upper fitting part 241' 243 is formed in the shape of a shallow container with a bottom wall 249, and the disc-shaped closure body 22 is fitted into the upper fitting part 243 so as to be wrapped therein.

According to such a structure, the closing body 22 is attracted to the solid body 18 by the magnetic force transmitted through the bottom wall 249 of the connecting member 24, and this attractive force causes the distal end surface of the cylindrical body 18 and the bottom wall 249 of the connecting member 24 to connect. The contact creates a seal. In this case as well, the thickness of the bottom wall 249 may be set to be thin enough to allow the magnetic force of the closure body 22 to reach the cylindrical body 18 .

Next, a fifth embodiment will be described based on FIGS. 10(a) and (b).

Here, the disc-shaped closing body 23 and the connecting member 24 similar to the above embodiment are integrally formed by a rubber magnet, and the main body of the cylindrical body 18 is made of a non-magnetic material such as synthetic resin or rubber. has been done. A suction member 25 made of a magnetic material such as stainless steel and having a through hole in the center is fitted into the inner wall of the main body of the cylinder 18, and the suction member 25 and the main body constitute the entire cylinder 18. has been done. and,
The suction member 25 is configured to suction the closure body 23 with the thin-walled cylindrical body 18 interposed therebetween.

Further, in this embodiment, the main body container 10 as shown in the previous embodiments is omitted, and the side surface of the cylindrical body 18 is directly exposed to the outside of the writing instrument. The cylindrical distal end body 2 is attached to the stepped portion 186.
6 is fitted.

As shown in this embodiment, the writing instrument according to the present invention is limited to one in which the closing body and the connecting member are separate bodies.

First, even if the two are integrated, the same effects as in the above embodiment can be obtained.

Next, a sixth embodiment will be described based on FIGS. 11(a) and (b).

Here, the main body of the cylindrical body 18 is formed of a non-magnetic material such as synthetic resin or rubber, and a suction member 25 similar to that of the above-mentioned embodiment is fixed to the upper end thereof. Similar to the embodiment, the closure body 22 fitted to the connecting member 24 is designed to be sucked. Also,
A seal portion 185 that comes into contact with the refill 14 is integrally formed on the inner wall surface of the main body of the cylinder 18 .

As shown in this sixth embodiment and the fifth embodiment, in the present invention, the entire cylindrical body 18 does not need to be made of a magnetic material, and at least the distal end portion thereof, that is, the portion that contacts the closure body is made of magnetic material. It is sufficient if it is made of any material. In addition to the writing instrument of the above embodiment, for example, a suction member having a cross-sectional shape substantially equal to that of the main body of the cylindrical body 18 may be fixed to the distal end surface of the main body using an adhesive or the like.

Note that the present invention is not limited to the above-described embodiments, and may take the following embodiments as examples.

(1) In the above embodiment, the entire cylindrical body 18 or its distal end portion is made of a magnetic material, and the closing body 22 (23>) is made of a magnet. It may be configured with a magnet, or the attraction member 25 may be configured with a magnet in FIGS. 10 and 11. When the attraction member 25 is configured with a magnet in the structure shown in FIG. The closing body 23 and the connecting member 24 may be integrally formed using a rubber magnet, or may be formed from rubber or the like containing magnetic material powder in a fractional state, instead of using a rubber magnet, to obtain the same effect as described above. is obtained.

Furthermore, both at least the distal end portion of the cylindrical body and the closure body may be constructed of magnets. In this case, the magnetic poles of the mutually contacting portions may be arranged to be different from each other.

(2) As shown in the first embodiment, the direct cylinder 18
When the and closure body 22 are brought into contact with each other, the sealing effect can be enhanced by applying a sealing agent such as vaseline, glue, lease, liquid paraffin, etc. to the mutually contacting portion (sealing portion) between the two.

(3) In the present invention, regardless of the specific material of the elastic material constituting the connecting member, any member may be used as long as it is elastically deformable to the extent that the closure body can move significantly.

However, in order to reduce the load acting on the writing body 143 when the refill 14 protrudes, it is preferable to use a member with as small an elastic modulus as possible.

(4) Although FIG. 2 above shows a case in which writing fluid is stored in the ink storage body 145 in the reflex beer 14, the present invention is not limited to this, and writing fluid is stored inside the writing shaft, such as in a fountain pen. It can also be applied to so-called free ink type writing instruments that directly store ink.

(5) The writing instrument of the present invention is not limited to a narrow concept such as a ballpoint pen or a paint marker, but can be used to apply a desired writing fluid to a desired location, such as glue, an applicator for applying correction fluid, or a makeup tool. It can be widely applied including tools.

〔Effect of the invention〕

As described above, the present invention configures the cylinder and the closing body so that they are magnetically attracted to each other, and also connects them with a connecting member made of an elastic material, and uses the elastic restoring force of this connecting member to cause the closing body to By magnetically attracting the closing body to the position where the suction force of the cylinder reaches, it is possible to securely seal the inside of the writing instrument, and the writing shaft When the closing body is moved from the protruding position to the storage position, the elastic force of the connecting member allows the closing body to be reliably moved to a position where the closing body is sucked into the cylindrical body. Moreover, when the writing shaft is moved from the storage position to the protruding position, the connecting member only needs to have an elastic return force sufficient to urge the closing body to the above-mentioned position. Compared to a structure in which the writing shaft is brought into pressure contact with the cylindrical body, there is an effect that the load acting on the tip of the writing shaft when it is projected can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of a writing instrument according to the first embodiment of the present invention, Fig. 2 is a cross-sectional view showing the internal structure of the refill in the same writing instrument, and Fig. 3 (a) shows the storage position of the writing shaft in the writing instrument. A cross-sectional view showing a state in which the writing instrument is in a state where the writing shaft is in a protruding position;
FIG. 4 is a cutaway perspective view of a connecting member attached to the same writing instrument, FIG. FIG. 6(a) is a sectional view showing the writing instrument in which the writing shaft is in the protruding position; FIG.
) is a cross-sectional view showing the writing shaft in the protruding position in the same writing instrument, FIG. 7 is a broken perspective view of a connecting member attached to the same writing instrument, and FIG. FIG. 9(b) is a sectional view showing the writing instrument in a state where the writing shaft is in the protruding position; FIG. 10(a) is a sectional view showing the writing instrument in the fifth embodiment with the writing shaft in the storage position, FIG. 10(b) is a sectional view showing the writing instrument in the protruding position, and FIG. Figure (a) is a cross-sectional view showing the writing instrument in the sixth embodiment, with the writing shaft in the retracted position, and Figure (b) is a cross-sectional view showing the writing implement in the writing implement, with the writing shaft in the protruding position. 14... Refill (writing shaft), 145... Ink storage body (writing fluid storage part), 146... Air passage, 14
7... Air flow port, 18... Cylindrical body, 183... Through hole, 22.23... Closure body, 24... Connection member,
25...Suction member.

Claims (1)

[Scope of Claims] 1. A cylindrical body having a through hole in the axial direction of the writing instrument, a writing shaft inserted into the through hole of the cylindrical body so as to be retractable in the distal direction from the distal end surface of the cylindrical body, and the aforementioned cylindrical body. and a closing body formed in a shape to close a distal opening of a through hole, wherein at least the distal end portion of the cylinder and the closing body are formed of a magnetic material, and at least one of these is formed of a magnet. The closing body is made of an elastic material so that the closing body closes the tip end opening of the through hole of the cylindrical body, and the writing shaft is opened by opening the tip opening. A connecting member is connected to the cylindrical body so as to be movable between a position where the closing body is protruded toward the distal end side, and a connecting member that biases the closing body in a direction toward the cylindrical body to a position where the suction force of the cylindrical body is applied. A writing instrument characterized by: 2. A writing fluid reservoir is provided in the writing shaft, and a passage is provided in the writing shaft that communicates the writing fluid reservoir with the cylindrical body while the tip of the writing shaft is housed in the cylindrical body. The writing instrument according to claim 1, characterized in that: