JP2006027063A - Double head writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double head writing utensil of a direct liquid type without the possibility that an ink outflow failure might occur, even in case the writing utensil is stored with any one of both pen points kept upward for a long time. <P>SOLUTION: This writing utensil is structured of a partition 3 formed inside a barrel 2 with both open ends and a first storage part 5A and a second storage part 5B not communicating with each other. Pen points 4A and 4B are fitted to the open ends of the first storage part 5A and the second storage part 5B respectively. In addition, an ink retaining member 6A connected with the pen point 4A at the open end is provided at least, at either of the first storage part 5A or the second storage part 5B. Further, an ink reservoir part 8A is provided behind the ink retaining part 6A. Besides, an ink 9A is directly reserved inside the ink reservoir part 8A and the rear end part of a guide core 7A is projected backward from the rear end of the ink retaining member 6A. When the pen point 4A forward of the ink retaining member 6A looks upward, the rear end part of the guide core 7A is kept in contact with the ink 9A inside the ink reservoir part 8A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a direct liquid type double-headed writing instrument. In the present invention, “front” refers to the first pen tip side in the first housing portion, refers to the second pen tip side in the second housing portion, and “rear” refers to The first storage section refers to the first ink storage section side, and the second storage section refers to the second ink storage section side.

  Conventionally, in this type of double-headed writing instrument, for example, Patent Document 1 discloses a writing instrument in which a nib unit having a direct liquid structure in which a nib, a nib holder, and an ink tank are fixed is detachably attached to both ends of the cylinder shaft. It is disclosed.

JP 2002-36786 A

  In the double-headed writing instrument of Patent Document 1, no consideration is given to the relationship between the rear end portion of the guide core protruding from the rear end of the ink retaining member and the ink liquid level. Therefore, when stored in the pen tip upward state for a long time, the ink in the pen tip drops back, or the capillary gap in the guide core is clogged by drying of the ink, and the pen tip on the side in the upward state There is a risk of ink outflow failure such as inability to write or handwriting blur.

  In the conventional double-headed writing instrument, when the nib on both sides is a direct liquid type provided with an ink retaining member, when storing the writing instrument in an upright state, one of the nibs is necessarily in an upward state. Thus, due to long-term storage in the pen tip upward state, ink outflow defects are likely to occur in the pen tip that is directed upward. Further, in the double-headed writing instrument, even when the pen point only on one side is a direct liquid type provided with an ink storage member, when storing the writing instrument in a standing state for a long period of time, in order to avoid the ink outflow defect, Care must be taken so that the pen tip side of the direct liquid type does not face upward.

  In the double-headed writing instrument of the above-mentioned Patent Document 1, when the ink remaining amount in the ink reservoir is reduced, the writing core is contacted with the ink in the ink reservoir when the writing instrument is used in a horizontal state or with the pen tip obliquely upward. The state becomes insufficient, and there is a possibility that ink outflow failure such as inability to write or fading will occur.

  The present invention solves the above-mentioned conventional problems, and even if any nib is stored upward for a long period of time, there is no risk of ink outflow failure and the remaining ink amount is reduced. In such a case, the present invention is intended to provide a double-headed writing instrument that does not cause ink outflow failure even when the writing instrument is used in a horizontal state or obliquely upwardly pointing the pen tip.

  The present invention is characterized by the following requirements (Claim 1) to (Claim 5).

(Claim 1) A partition is formed inside a shaft cylinder having both ends opened, and a first housing portion opened from one end of the shaft cylinder and a first opening opened from the other end of the shaft cylinder by the partition. 2 accommodating portions, the first accommodating portion and the second accommodating portion are not in communication with each other, and each of the opening end of the first accommodating portion and the opening end of the second accommodating portion is provided. A double-headed writing instrument provided with a pen tip, wherein at least one of the first storage portion and the second storage portion is provided with an ink reservoir member connected to the pen tip at the open end of the pen tip An ink reservoir is provided behind the ink reservoir, the ink is directly stored in the ink reservoir, and the ink reservoir temporarily ejects the overflow ink in response to the pressure increase in the ink reservoir. From the ink reservoir to the axial center of the ink reservoir. A guide core for supplying ink to the pen tip in front of the ink storage member is inserted, and the rear end portion of the guide core protrudes rearward from the rear end of the ink storage member. The double-headed writing instrument, wherein the rear end portion of the guide core and the ink in the ink reservoir are in contact with each other when the front pen tip is upward.

(Claim 2) A partition is formed inside the shaft cylinder having both ends open, and a first housing portion that opens from one end of the shaft cylinder and a first opening that opens from the other end of the shaft cylinder by the partition. 2 containing portions, the first containing portion and the second containing portion do not communicate with each other, a first nib is provided at the opening end of the first containing portion, A first ink reservoir member connected to the first pen tip is provided in an opening of the first storage portion behind the pen tip, and the first storage is provided behind the first ink reservoir member. A first ink reservoir is provided in the section, the first ink is directly stored in the first ink reservoir, and the first ink reservoir member responds to an increase in pressure in the first ink reservoir. The extra ink is temporarily retained, and the first ink reservoir is disposed on the shaft center of the first ink reservoir member. A first guide core for supplying the first ink is inserted, a rear end portion of the first guide core is protruded rearward from a rear end of the first ink reservoir member, and the second storage portion A second pen tip is provided at the opening end of the second ink tip, and a second ink reservoir member connected to the second pen tip is provided in the opening of the second storage portion behind the second pen tip, A second ink reservoir is provided in a second storage portion behind the second ink reservoir, and the second ink is directly stored in the second ink reservoir, and the second ink reservoir is stored. The member temporarily holds the overflow ink corresponding to the pressure increase in the second ink reservoir, and the second ink tip from the second ink reservoir to the shaft center of the second ink reservoir A second guide core for supplying the second ink is inserted into the rear end of the second guide core behind the rear end of the second ink reservoir member. The rear end of the first guide core and the first ink are in contact with each other when the first pen tip is upward, and the second guide core is in contact with the second pen tip upward. A double-headed writing instrument, wherein a rear end portion of the second ink and the second ink are in contact with each other.

(Claim 3) The partition wall extends in the axial direction, one end of the partition wall is connected to the axial cylinder side wall in the vicinity of the first ink reservoir member, and the other end of the partition wall is a second ink reservoir. The double-headed writing instrument according to claim 2, wherein the double-headed writing instrument is connected to a shaft cylinder side wall near the member.

(Claim 4) The partition wall includes a central wall portion extending in the axial direction, a first bottom wall portion connecting one end of the central wall portion and a shaft cylinder side wall in the vicinity of the first ink reservoir member, A second bottom wall portion connecting the other end of the central wall portion and the shaft cylinder side wall in the vicinity of the second ink reservoir member; and after the first bottom wall portion and the first ink reservoir member A first concave space is formed by the end surface, a rear end portion of the first guide core is positioned in the first concave space, and the second bottom wall portion and the second ink reservoir member The double-headed writing instrument according to claim 3, wherein a second concave space is formed by the rear end surface, and a rear end portion of the second guide core is positioned in the second concave space.

(Claim 5) A first rib extending in the axial direction is formed on the inner surface or the first bottom wall portion of the axial tube side wall constituting the first concave space, and the first rib and the first guide are formed. A second rib extending in the axial direction is formed on the inner surface of the axial tube side wall or the second bottom wall portion forming the second concave space, with a gap having a capillary force formed between the outer peripheral surface of the rear end portion of the core. The double-headed writing instrument according to claim 4, wherein a gap having a capillary force is formed between the second rib and the outer peripheral surface of the rear end portion of the second guide core.

  According to the first aspect, even if the direct liquid type nib side is stored upward for a long period of time, there is no possibility that an ink outflow defect occurs on the direct liquid type nib side. In addition, when the pen tip on only one side is a direct liquid type with an ink storage member, when storing a double-headed writing instrument in a standing state for a long period of time, the direct liquid type pen tip side should not be in an upward state. There is no need to pay attention to.

  According to the second aspect, even if the first or second nib is stored in an upward direction for a long period of time, there is no risk of ink outflow failure.

  According to claim 3, even if writing is used in a horizontal state when the remaining amount of ink in the first or second ink reservoir is low, the ink in the first or second ink reservoir is the first or second. The ink is held in the vicinity of the rear end of the second ink reservoir member, the contact state between the rear end of the first or second guide core and the ink is maintained, and the occurrence of ink outflow failure can be suppressed.

  According to claim 4, the ink in the first or second ink reservoir can be used even if writing is performed with the pen tip obliquely upward when the remaining amount of ink in the first or second ink reservoir is low. Is held in the concave space near the rear end of the first or second ink reservoir member, the contact state between the rear end of the first or second guide core and the ink is maintained, and ink outflow failure occurs. Can be suppressed.

  According to the fifth aspect, even when the remaining amount of ink in the first or second ink reservoir is further reduced, the ink can be sufficiently supplied to the rear end portion of the guide core. The ink can be written until the remaining amount of ink in the ink reservoir is exhausted.

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

  In the double-headed writing instrument 1 according to the first embodiment of the present invention, a partition wall 3 is formed inside a shaft cylinder 2 that opens at both ends, and the partition wall 3 opens inside the shaft cylinder 2 from one end of the shaft cylinder 2. A first housing portion 5A and a second housing portion 5B that opens from the other end of the shaft cylinder 2 are provided, and the first housing portion 5A and the second housing portion 5B are configured not to communicate with each other. A double-headed writing instrument 1 having pen tips 4A and 4B at the opening end of the first receiving portion 5A and the opening end of the second receiving portion 5B, respectively, and at least the first receiving portion 5A or the second Ink storage members 6A and 6B connected to the pen tips 4A and 4B at the open ends are provided in either one of the storage portions 5B at the rear of the pen tips 4A and 4B, and the ink storage members 6A and 6B Ink reservoirs 8A and 8B are provided at the rear, and ink is stored in the ink reservoirs 8A and 8B. A and 9B are directly stored, and the ink storage members 6A and 6B temporarily hold the overflow ink corresponding to the pressure increase in the ink storage portions 8A and 8B, and the ink storage members 6A and 6B. Guide cores 7A and 7B for supplying ink 9A and 9B from the ink storage portions 8A and 8B to the pen tips 4A and 4B in front of the ink storage members 6A and 6B are inserted into the shaft centers, and the guide core 7A is inserted. , 7B is projected rearward from the rear ends of the ink reservoir members 6A, 6B, and when the pen nibs 4A, 4B in front of the ink reservoir members 6A, 6B are upward, the guide cores 7A, 7B The back end portion of the ink and the inks 9A and 9B in the ink storage portions 8A and 8B are in contact with each other (claim 1).

  The double-headed writing instrument 1 having the above-described configuration (claim 1) has the induction core 7A even if the pen tip side provided with the direct liquid type ink supply means including the ink retaining members 6A and 6B is stored in an upward state for a long time. , 7B are in contact with the ink in the ink reservoirs 8A, 8B (ie, the rear ends of the guide cores 7A, 7B are located below the liquid level of the inks 9A, 9B). , 4B can be prevented from dropping back and the crevice gaps in the guide cores 7A, 7B being clogged due to drying. Ink spillage is maintained. Further, in the double-headed writing instrument 1 having the above-described configuration (claim 1), when only one of the shaft cylinders 2 is a direct liquid type provided with the ink storage members 6A and 6B, the user stands the double-headed writing instrument in a standing state. When storing for a long period of time, it is not necessary to take care that the direct liquid type nib side does not face upward in order to avoid the dropback and clogging.

  In the double-headed writing instrument 1 having the above-described configuration (claim 1), the direct liquid type ink supply means is provided at least on one side of the shaft tube 2. In that case, the other side of the barrel 2 is a direct liquid type having the same ink retaining member as above, and a batting type (a type in which ink impregnated in an ink occlusion body made of a fiber processed body or the like is supplied to the pen tip). And a direct filling type (a type in which the rear end surface of the ink filled in the ink containing tube advances as the ink is consumed).

  Examples of the nibs 4A and 4B include a fiber processed body, a porous body, a brush body, an extruded body of a synthetic resin, a ballpoint pen tip, a fountain pen-shaped metal plate pen body, and the like. Examples of the induction core include a synthetic resin extrusion-molded body and a fiber resin processed body. Further, the guide core may also serve as a pen tip. The partition wall 3 may have any configuration as long as the inside of the shaft cylinder 2 is separated from the first housing portion 5A and the second housing portion 5B in a non-communication state. For example, the inner wall of the shaft tube 2 Or a separate member attached to the inner surface of the shaft tube 2.

  The double-headed writing instrument 1 according to the second embodiment of the present invention forms a partition wall 3 in a shaft cylinder 2 that opens at both ends, and the partition wall 3 opens into the shaft cylinder 2 from one end of the shaft cylinder 2. A first housing portion 5A and a second housing portion 5B that opens from the other end of the shaft cylinder 2 are provided, and the first housing portion 5A and the second housing portion 5B are configured not to communicate with each other. A first nib 4A is provided at the opening end of the first accommodating portion 5A, and is connected to the first nib 4A in the opening of the first accommodating portion 5A behind the first nib 4A. The first ink reservoir member 6A is provided, the first ink reservoir 8A is provided in the first storage portion 5A behind the first ink reservoir member 6A, and the first ink reservoir 8A is provided. The first ink 9A is directly stored in the first ink storage member 6A, and the first ink storage member 6A is stored in the first ink storage portion 8A. The overflow ink corresponding to the force increase is temporarily held, and the first ink 9A is supplied from the first ink reservoir 8A to the first nib 4A on the axis of the first ink reservoir 6A. The first guide core 7A to be inserted is inserted, the rear end portion of the first guide core 7A protrudes rearward from the rear end of the first ink reservoir member 6A, and the opening of the second storage portion 5B A second pen tip 4B is provided at the end, and a second ink reservoir member 6B connected to the second pen tip 4B in the opening of the second storage portion 5B behind the second pen tip 4B. A second ink storage portion 8B is provided in the second storage portion 5B behind the second ink storage member 6B, and the second ink 9B is directly placed in the second ink storage portion 8B. The second ink storage member 6B is stored and overflowed ink in response to an increase in pressure in the second ink storage portion 8B. A second guide core 7B that temporarily holds and supplies the second ink 9B from the second ink reservoir 8B to the second pen tip 4B is provided on the axis of the second ink reservoir member 6B. The rear end portion of the second guide core 7B protrudes rearward from the rear end of the second ink retaining member 6B, and when the first pen tip 4A is upward, the first guide core 7A is inserted. The rear end portion of the second guide core 7B is in contact with the second ink 9B when the second pen tip 4B is upward. (Claim 2).

  In the double-headed writing instrument 1 having the above-described configuration (claim 2), when the first nib 4A is stored for a long time in the upward state, the rear end portion of the first guide core 7A and the first ink 9A are in contact with each other. (That is, the rear end of the first guide core 7A is located below the liquid surface of the first ink 9A), thereby avoiding clogging due to dropback or drying in the first nib 4A. Ink penetrating failure can be prevented in the first nib 4A. Similarly, the double-headed writing instrument 1 having the above-described configuration (Claim 2), when the second nib 4B is stored in an upward state for a long time, the rear end portion of the second guide core 7B, the second ink 9B, Is in a contact state (that is, the rear end of the second guide core 7B is located below the liquid surface of the second ink 9B), and clogging due to dropback or drying in the second nib 4B. Can be avoided and ink outflow failure can be prevented in the second nib 4B.

  The first nib 4A and the second nib 4B are, for example, a fiber processed body, a porous body, a brush, a synthetic resin extrusion, a ballpoint pen tip, a fountain pen-shaped metal plate pen, and the like. Is mentioned. Examples of the first guide core 7A and the second guide core 7B include an extruded product of synthetic resin and a resin processed product of fiber. The first guide core 7A and the second guide core 7B may also serve as a pen tip. The partition wall 3 may have any configuration as long as the inside of the shaft cylinder 2 is separated from the first housing portion 5A and the second housing portion 5B in a non-communication state. For example, the inner wall of the shaft tube 2 Or a separate member attached to the inner surface of the shaft tube 2.

  The double-headed writing instrument 1 according to claim 2, wherein the partition wall 3 extends in the axial direction, one end of the partition wall 3 is connected to the side wall of the shaft cylinder 2 in the vicinity of the first ink storage member 6A, and the partition wall 3 is preferably connected to the side wall of the shaft cylinder 2 in the vicinity of the second ink reservoir member 6B.

  When the remaining amount of the first ink 9A in the first ink reservoir 8A is reduced, the double-headed writing instrument 1 having the above configuration (Claim 3) uses the first nib 4A side in the horizontal state for writing. Even so, if the connecting portion between one end of the partition wall 3 and the side wall of the shaft cylinder 2 in the vicinity of the first ink reservoir member 6A is set to the lower side, the first ink remaining in the first ink reservoir 8A is reduced to the first level. The ink storage member 6A moves to the vicinity of the rear end of the first ink lead member 7A, the contact state between the rear end portion of the first guide core 7A and the first ink 9A is maintained, and the occurrence of ink outflow defects can be suppressed (FIG. 4). Similarly, the double-headed writing instrument 1 having the above configuration (Claim 3) has the second pen tip 4B side in a horizontal state when the remaining amount of the second ink 9B in the second ink reservoir 8B decreases. If the connecting portion between the other end of the partition wall 3 and the side wall of the shaft cylinder 2 in the vicinity of the second ink reservoir member 6B is set to the lower side, the second remaining in the second ink reservoir 8B is reduced. Ink moves to the vicinity of the rear end of the second ink reservoir member 6B, the contact state between the rear end of the second guide core 7B and the second ink 9B is maintained, and the occurrence of defective ink outflow is suppressed. Can do.

  The partition wall 3 extends in the axial direction as a whole, and one end and the other end only need to be in a position separated in the axial direction. For example, the partition wall 3 may extend in a direction inclined with respect to the axis. It may be configured to extend in parallel to the axis, or a combination of the two configurations.

  Further, in the third aspect, the partition wall 3 connects the central wall portion 31 extending in the axial direction, one end of the central wall portion 31 and the side wall of the shaft cylinder 2 in the vicinity of the first ink reservoir member 6A. 1 and the second bottom wall portion 33 connecting the other end of the central wall portion 31 and the side wall of the shaft cylinder 2 in the vicinity of the second ink reservoir member 6B. A first concave space 10A is formed by the bottom wall portion 32 and the rear end surface of the first ink reservoir member 6A, and the rear end portion of the first guide core 7A is positioned in the first concave space 10A. The second bottom wall 33 and the rear end surface of the second ink reservoir member 6B form a second concave space 10B, and the second guide core 7B is formed in the second concave space 10B. It is preferable that the rear end portion is positioned (Claim 4).

  When the remaining amount of the first ink 9A in the first ink reservoir 8A is reduced, the double-headed writing instrument 1 having the above configuration (Claim 4) has the pen nib obliquely upward and the first nib 4A side. Even if writing is used, if the first concave space 10A is set to the lower side, the remaining little first ink in the first ink reservoir 8A is held in the first concave space 10A, and the first guide core 7A The contact state between the rear end portion and the first ink 9A is maintained, and the occurrence of ink outflow defects can be suppressed. Similarly, the double-headed writing instrument 1 having the above configuration (Claim 4) has the second pen tip obliquely upward when the remaining amount of the second ink 9B in the second ink reservoir 8B is reduced. Even if the 4B side is used for writing, if the second concave space 10B is set to the lower side, the remaining second ink in the second ink reservoir 8B is held in the second concave space 10B, and the second guide The contact state between the rear end portion of the core 7B and the second ink 9B is maintained, and the occurrence of ink outflow defects can be suppressed.

  In the said Claim 4, the 1st rib 11A extended in an axial direction is formed in the axial cylinder 2 side wall inner surface or the 1st bottom wall part 32 which comprises the said 1st recessed space 10A, The said 1st rib 11A A gap 12A having a capillary force is formed between the first guide core 7A and the outer peripheral surface of the rear end of the first guide core 7A, and the inner surface of the side wall of the shaft cylinder 2 or the second bottom wall portion constituting the second concave space 10B. A second rib 11B extending in the axial direction is formed in 33, and a gap 12B having a capillary force is formed between the second rib 11B and the outer peripheral surface of the rear end portion of the second guide core 7B. (Claim 5) is preferable.

  Even if the remaining amount of the first ink 9A in the first ink reservoir 8A is further reduced, the double-headed writing instrument 1 having the above configuration (Claim 5) has the first rib 11A and the first rib 11A. The first ink 9A can be supplied to the rear end portion of the first guide core 7A by the gap 12A having a capillary force formed between the outer peripheral surface of the rear end portion of the guide core 7A, and ink outflow failure occurs. Without using, the first ink 9A in the first ink reservoir 8A can be used up to the end. Similarly, the double-headed writing instrument 1 having the above-described configuration (Claim 5) has the second rib 11B and the above-described one even when the remaining amount of the second ink 9B in the second ink reservoir 8B is further reduced. The second ink 9B can be supplied to the rear end portion of the second guide core 7B by the gap 12B having a capillary force formed between the outer peripheral surface of the rear end portion of the second guide core 7B and the ink outflow. The second ink 9B in the second ink reservoir 8B can be used up to the end without causing a defect.

1 to 4 show a first embodiment of the present invention.
The double-headed writing instrument 1 of the present embodiment includes a shaft cylinder 2 having a first nib 4A at one end and a second nib 4B at the other end.

-Shaft cylinder The said shaft cylinder 2 is a cylindrical body by which both ends were opened. The shaft cylinder 2 is obtained by injection molding of a transparent synthetic resin (that is, a transparent or translucent synthetic resin). A partition wall 3 is integrally formed on the inner surface of the shaft tube 2. By the partition wall 3, a first housing portion 5 </ b> A that opens from one end of the shaft tube 2 and a second housing portion 5 </ b> B that opens from the other end of the shaft tube 2 are formed inside the shaft tube 2. The partition 3 prevents the first storage portion 5A and the second storage portion 5B from communicating with each other and prevents ink from flowing through each other. Examples of the transparent or translucent synthetic resin include polypropylene. In the present embodiment, the transparent or semi-transparent synthetic resin is a colorless or non-colored transparent synthetic resin so that the ink color in the shaft tube 2 is easily visible.

Partition Wall The partition wall 3 includes a central wall portion 31 that extends substantially parallel to the axis, and a first bottom wall portion 32 and a second bottom wall that are inclined with respect to the axial line extending from both ends of the central wall portion 31. Part 33. The first bottom wall portion 32 is integrally connected to the inner surface of the side wall of the shaft cylinder 2 in the vicinity of the first ink reservoir member 6A, and the second bottom wall portion 33 is in the vicinity of the second ink reservoir member 6B. The shaft cylinder 2 is integrally connected to the inner surface of the side wall. By the partition wall 3, the first ink storage portion 8 </ b> A and the second ink storage portion 8 </ b> B are formed in a two-layered state overlapping in the radial direction via the partition wall 3.

First storage portion The first storage portion 5A includes a first large-diameter portion 51A having a circular cross section that opens forward, and a cross-section that is connected to the rear of the first large-diameter portion 51A. It consists of a semicircular first small diameter portion 52A. The first ink retaining member 6A is fitted into the first large diameter portion 51A. A space formed by the first large-diameter portion 51A and the first small-diameter portion 52A behind the first ink reservoir member 6A (that is, the first large-diameter portion 51A and the first small-diameter portion 52A behind the first ink reservoir member 6A). ) Is formed with the first ink reservoir 8A.

Second storage portion The second storage portion 5B includes a second large-diameter portion 51B having a circular cross section that opens forward, and a cross-section that is connected to the rear of the second large-diameter portion 51B. It consists of a semicircular second small diameter portion 52B. The second ink reservoir member 6B is fitted into the second large diameter portion 51B. A space formed of the second large-diameter portion 51B and the second small-diameter portion 52B behind the second ink reservoir member 6B (ie, the second large-diameter portion 51B and the second small-diameter portion 52B behind the second ink reservoir member 6B). ) Is formed with the second ink reservoir 8B.

First ink reservoir member The first ink reservoir member 6A is a member that temporarily holds overflow ink in response to an increase in pressure in the first ink reservoir 8A. In this embodiment, It is an injection-molded body of a synthetic resin (for example, ABS resin) provided with a plurality of disk-like comb teeth. A first nib 4A is attached to the front end of the first ink reservoir member 6A. A shaft hole is formed through the shaft center of the first ink reservoir member 6A, and the first guide core 7A is inserted into the shaft hole. The front end of the first guide core 7A protrudes forward from the front end of the first ink retaining member 6A to become the first pen tip 4A, and the rear end of the first guide core 7A is the first ink. It protrudes backward from the rear end of the retaining member 6A.

First guide core The first guide core 7A may be any of a fiber processed body, a porous body, and a synthetic resin extruded body having a capillary passage in the axial direction. The core portion 71A is made of an extruded product of a soft synthetic resin such as polyester elastomer, and the outer skin portion 72A is made of a hard synthetic resin such as polyacetal resin that covers the outer periphery of the core portion 71A. The front end portion of the first guide core 7A has a core portion 71A and an outer skin portion 72A ground in a brush shape, the capillary passage of the core portion 71A is exposed to the outside, and becomes a brush pen tip.

  On the other hand, at the rear end portion of the first guide core 7A, the core portion 71A and the outer skin portion 72A are ground, and the capillary passage of the core portion 71A is exposed radially outward. When the first nib 4A is in the upward state (see FIG. 1), the rear end portion of the first guide core 7A is immersed in the first ink 9A, and the rear end of the first guide core 7A is the first end. The rear end portion of the first guide core 7A and the first ink 9A are in contact with each other. The axial distance between the rear end of the first guide core 7A and the liquid surface of the first ink 9A is that sufficient ink can be supplied to the first guide core 7A even when the pen tip is upward. 0.5 mm or more (preferably 1 mm or more) is effective.

  When the first nib 4A is in the upward state (see FIG. 1), the second nib 4B side in the downward state is also on the rear end portion of the second guide core 7B and the second ink 9B. Will be in contact.

Second ink reservoir member The second ink reservoir member 6B is a member that temporarily holds overflow ink in response to a pressure increase in the second ink reservoir 8B. In this embodiment, It is an injection-molded body of a synthetic resin (for example, ABS resin) provided with a plurality of disk-like comb teeth. A second pen tip 4B is attached to the front end of the second ink reservoir member 6B. A shaft hole is formed through the shaft center of the second ink reservoir member 6B, and a second guide core 7B is inserted into the shaft hole. The front end of the second guide core 7B protrudes forward from the front end of the second ink reservoir member 6B to become the second pen tip 4B, and the rear end of the second guide core 7B is the second ink. It protrudes backward from the rear end of the retaining member 6B.

Second guide core The second guide core 7B may be any of a fiber processed body, a porous body, and a synthetic resin extruded body having a capillary passage in the axial direction. And a core portion 71B made of an extruded product of a soft synthetic resin such as polyester elastomer, and an outer skin portion 72B made of a hard synthetic resin such as polyacetal resin covering the outer periphery of the core portion 71B. The front end portion of the second guide core 7B has the core portion 71B and the outer skin portion 72B ground in a brush shape, and the capillary passage of the core portion 71B is exposed to the outside to become a brush pen tip.

  On the other hand, at the rear end portion of the second induction core 7B, the core portion 71B and the outer skin portion 72B are ground, and the capillary passage of the core portion 71B is exposed radially outward. When the second nib 4B is in the upward state (see FIG. 3), the rear end portion of the second guide core 7B is immersed in the second ink 9B, and the rear end of the second guide core 7B is the second end. The rear end portion of the second guide core 7B and the second ink 9B are in contact with each other.

  The axial distance between the rear end of the second guide core 7B and the liquid level of the second ink 9B is such that sufficient ink can be supplied to the second guide core 7B even when the pen tip is upward. 0.5 mm or more (preferably 1 mm or more) is effective.

  When the second pen tip 4B is in the upward state (see FIG. 3), the first pen tip 4A side in the downward state is also connected to the rear end portion of the first guide core 7A and the first ink 9A. Will be in contact.

First concave space Due to the first bottom wall portion 32, the rear end surface of the first ink storage member 6A, and the shaft cylinder 2 side wall therebetween, the first concave space 10A having a concave longitudinal section is formed. It is formed. A rear end portion of the first guide core 7A is located in the first concave space 10A. Further, the rear end of the first guide core 7 </ b> A is positioned behind the front end of the inclined first bottom wall portion 32 and ahead of the rear end of the inclined first bottom wall portion 32. Thereby, the rear end of the first guide core 7A and the first bottom wall portion 32 are brought close to each other, and the rearward protrusion amount of the rear end portion of the first ink guide core 7A can be set as long as possible.

  When the remaining amount of the first ink 9A in the first ink reservoir 8A is reduced, the double-headed writing instrument 1 is placed in a horizontal state (see FIG. 4) or the first nib 4A is inclined upward. If the first concave space 10A is on the lower side, the first ink 9A can be held in the first concave space 10A, and the rear end of the first ink 9A and the first guide core 7A The first ink 9A can be supplied to the capillary passage of the first guide core 7A, and the writing can be used without ink outflow failure.

Second concave space Similarly, the second concave space 10B is formed by the second bottom wall portion 33, the rear end surface of the second ink reservoir member 6B, and the shaft cylinder 2 side wall therebetween. Is done. A rear end portion of the second guide core 7B is located in the second concave space 10B. Further, the rear end of the second guide core 7 </ b> B is positioned behind the front end of the inclined second bottom wall portion 33 and ahead of the rear end of the inclined second bottom wall portion 33. Thereby, the rear end of the second guide core 7B and the second bottom wall 33 are brought close to each other, and the rearward protrusion amount of the rear end of the second ink guide core 7B can be set as long as possible.

  When the remaining amount of the second ink 9B in the second ink reservoir 8B decreases, the second concave shape can be obtained even when the double-headed writing instrument 1 is placed in a horizontal state or the second nib 4B is inclined upward. If the space 10B is on the lower side, the second ink 9B can be held in the second concave space 10B, and the contact state between the second ink 9B and the rear end portion of the second guide core 7B. Is maintained, the second ink 9B can be supplied to the capillary passage of the second guide core 7B, and writing can be used without ink outflow failure.

Ink In this embodiment, the first ink reservoir 8A is filled with the black (black) first ink 9A, and the second ink reservoir 8B is filled with the gray (light ink) first ink. Second ink 9B is filled. As a result, a direct liquid type double-headed brush pen for Keigo is obtained.

5 to 8 show a second embodiment of the present invention.
The double-headed writing instrument 1 of the present embodiment includes a shaft cylinder 2 having a first nib 4A at one end and a second nib 4B at the other end.

-Shaft cylinder The said shaft cylinder 2 is a cylindrical body by which both ends were opened. The shaft cylinder 2 is obtained by injection molding of a transparent synthetic resin (that is, a transparent or translucent synthetic resin). A partition wall 3 is integrally formed on the inner surface of the shaft tube 2. By the partition wall 3, a first housing portion 5 </ b> A that opens from one end of the shaft tube 2 and a second housing portion 5 </ b> B that opens from the other end of the shaft tube 2 are formed inside the shaft tube 2. The partition 3 prevents the first storage portion 5A and the second storage portion 5B from communicating with each other and prevents ink from flowing through each other. Examples of the transparent or translucent synthetic resin include polypropylene. In the present embodiment, the transparent or semi-transparent synthetic resin is a colorless or non-colored transparent synthetic resin so that the ink color in the shaft tube 2 is easily visible.

Partition Wall The partition wall 3 includes a central wall portion 31 that extends substantially parallel to the axis, and a first bottom wall portion 32 and a second bottom wall that are inclined with respect to the axial line extending from both ends of the central wall portion 31. Part 33. The first bottom wall portion 32 is integrally connected to the inner surface of the side wall of the shaft cylinder 2 in the vicinity of the first ink reservoir member 6A, and the second bottom wall portion 33 is in the vicinity of the second ink reservoir member 6B. The shaft cylinder 2 is integrally connected to the inner surface of the side wall. By the partition wall 3, the first ink storage portion 8 </ b> A and the second ink storage portion 8 </ b> B are formed in a two-layered state overlapping in the radial direction via the partition wall 3.

First storage portion The first storage portion 5A includes a first large-diameter portion 51A having a circular cross section that opens forward, and a cross-section that is connected to the rear of the first large-diameter portion 51A. It consists of a semicircular first small diameter portion 52A. The first ink retaining member 6A is fitted into the first large diameter portion 51A. A space formed by the first large-diameter portion 51A and the first small-diameter portion 52A behind the first ink reservoir member 6A (that is, the first large-diameter portion 51A and the first small-diameter portion 52A behind the first ink reservoir member 6A). ) Is formed with the first ink reservoir 8A.

Second storage portion The second storage portion 5B includes a second large-diameter portion 51B having a circular cross section that opens forward, and a cross-section that is connected to the rear of the second large-diameter portion 51B. It consists of a semicircular second small diameter portion 52B. The second ink reservoir member 6B is fitted into the second large diameter portion 51B. A space formed of the second large-diameter portion 51B and the second small-diameter portion 52B behind the second ink reservoir member 6B (ie, the second large-diameter portion 51B and the second small-diameter portion 52B behind the second ink reservoir member 6B). ) Is formed with the second ink reservoir 8B.

First ink reservoir member The first ink reservoir member 6A is a member that temporarily holds overflow ink in response to an increase in pressure in the first ink reservoir 8A. In this embodiment, It is an injection-molded body of a synthetic resin (for example, ABS resin) provided with a plurality of disk-like comb teeth. A first nib 4A is attached to the front end of the first ink reservoir member 6A. A shaft hole is formed through the shaft center of the first ink reservoir member 6A, and the first guide core 7A is inserted into the shaft hole. The front end of the first guide core 7A protrudes forward from the front end of the first ink retaining member 6A to become the first pen tip 4A, and the rear end of the first guide core 7A is the first ink. It protrudes backward from the rear end of the retaining member 6A.

First guide core The first guide core 7A may be any of a fiber processed body, a porous body, and a synthetic resin extruded body having a capillary passage in the axial direction. The core portion 71A is made of an extruded product of a soft synthetic resin such as polyester elastomer, and the outer skin portion 72A is made of a hard synthetic resin such as polyacetal resin that covers the outer periphery of the core portion 71A. The front end portion of the first guide core 7A has a core portion 71A and an outer skin portion 72A ground in a brush shape, the capillary passage of the core portion 71A is exposed to the outside, and becomes a brush pen tip.

  On the other hand, at the rear end portion of the first guide core 7A, the core portion 71A and the outer skin portion 72A are ground, and the capillary passage of the core portion 71A is exposed radially outward. When the first nib 4A is in the upward state (see FIG. 1), the rear end portion of the first guide core 7A is immersed in the first ink 9A, and the rear end of the first guide core 7A is the first end. The rear end portion of the first guide core 7A and the first ink 9A are in contact with each other. The axial distance between the rear end of the first guide core 7A and the liquid surface of the first ink 9A is that sufficient ink can be supplied to the first guide core 7A even when the pen tip is upward. 0.5 mm or more (preferably 1 mm or more) is effective.

  When the first nib 4A is in the upward state (see FIG. 1), the second nib 4B side in the downward state is also on the rear end portion of the second guide core 7B and the second ink 9B. Will be in contact.

Second ink reservoir member The second ink reservoir member 6B is a member that temporarily holds overflow ink in response to a pressure increase in the second ink reservoir 8B. In this embodiment, It is an injection-molded body of a synthetic resin (for example, ABS resin) provided with a plurality of disk-like comb teeth. A second pen tip 4B is attached to the front end of the second ink reservoir member 6B. A shaft hole is formed through the shaft center of the second ink reservoir member 6B, and a second guide core 7B is inserted into the shaft hole. The front end of the second guide core 7B protrudes forward from the front end of the second ink reservoir member 6B to become the second pen tip 4B, and the rear end of the second guide core 7B is the second ink. It protrudes backward from the rear end of the retaining member 6B.

Second guide core The second guide core 7B may be any of a fiber processed body, a porous body, and a synthetic resin extruded body having a capillary passage in the axial direction. And a core portion 71B made of an extruded product of a soft synthetic resin such as polyester elastomer, and an outer skin portion 72B made of a hard synthetic resin such as polyacetal resin covering the outer periphery of the core portion 71B. The front end portion of the second guide core 7B has the core portion 71B and the outer skin portion 72B ground in a brush shape, and the capillary passage of the core portion 71B is exposed to the outside to become a brush pen tip.

  On the other hand, at the rear end portion of the second induction core 7B, the core portion 71B and the outer skin portion 72B are ground, and the capillary passage of the core portion 71B is exposed radially outward. When the second nib 4B is in the upward state (see FIG. 3), the rear end portion of the second guide core 7B is immersed in the second ink 9B, and the rear end of the second guide core 7B is the second end. The rear end portion of the second guide core 7B and the second ink 9B are in contact with each other.

  The axial distance between the rear end of the second guide core 7B and the liquid level of the second ink 9B is such that sufficient ink can be supplied to the second guide core 7B even when the pen tip is upward. 0.5 mm or more (preferably 1 mm or more) is effective.

  When the second pen tip 4B is in the upward state (see FIG. 3), the first pen tip 4A side in the downward state is also connected to the rear end portion of the first guide core 7A and the first ink 9A. Will be in contact.

First concave space Due to the first bottom wall portion 32, the rear end surface of the first ink storage member 6A, and the shaft cylinder 2 side wall therebetween, the first concave space 10A having a concave longitudinal section is formed. It is formed. A rear end portion of the first guide core 7A is located in the first concave space 10A. Further, the rear end of the first guide core 7 </ b> A is positioned behind the front end of the inclined first bottom wall portion 32 and ahead of the rear end of the inclined first bottom wall portion 32. Thereby, the rear end of the first guide core 7A and the first bottom wall portion 32 are brought close to each other, and the rearward protrusion amount of the rear end portion of the first ink guide core 7A can be set as long as possible.

  When the remaining amount of the first ink 9A in the first ink reservoir 8A decreases, the double-headed writing instrument 1 is placed in a horizontal state (see FIG. 8) or the first nib 4A is inclined upward. If the first concave space 10A is on the lower side, the first ink 9A can be held in the first concave space 10A, and the rear end of the first ink 9A and the first guide core 7A The first ink 9A can be supplied to the capillary passage of the first guide core 7A, and the writing can be used without ink outflow failure.

Second concave space Similarly, the second concave space 10B is formed by the second bottom wall portion 33, the rear end surface of the second ink reservoir member 6B, and the shaft cylinder 2 side wall therebetween. Is done. A rear end portion of the second guide core 7B is located in the second concave space 10B. Further, the rear end of the second guide core 7 </ b> B is positioned behind the front end of the inclined second bottom wall portion 33 and ahead of the rear end of the inclined second bottom wall portion 33. Thereby, the rear end of the second guide core 7B and the second bottom wall 33 are brought close to each other, and the rearward protrusion amount of the rear end of the second ink guide core 7B can be set as long as possible.

  When the remaining amount of the second ink 9B in the second ink reservoir 8B decreases, the second concave shape can be obtained even when the double-headed writing instrument 1 is placed in a horizontal state or the second nib 4B is inclined upward. If the space 10B is on the lower side, the second ink 9B can be held in the second concave space 10B, and the contact state between the second ink 9B and the rear end portion of the second guide core 7B. Is maintained, the second ink 9B can be supplied to the capillary passage of the second guide core 7B, and writing can be used without ink outflow failure.

-1st rib The 1st rib 11A extended in an axial direction is integrally formed in the axial cylinder 2 side wall inner surface and the 1st bottom wall part 32 which comprise 10 A of said 1st recessed spaces. A gap 12A having a capillary force is formed between the first rib 11A and the outer peripheral surface of the rear end portion of the first guide core 7A. Even when the remaining amount of the first ink 9A in the first ink reservoir 8A decreases due to the gap 12A, the ink can be reliably supplied to the rear end portion of the first guide core 7A. As a result, the first ink 9A in the first ink reservoir 8A can be exhausted.

-2nd rib Similarly, the 2nd rib 11B extended in an axial direction is integrally formed in the axial cylinder 2 side wall inner surface and the 2nd bottom wall part 33 which comprise the said 2nd recessed space 10B. A gap 12B having a capillary force is formed between the second rib 11B and the outer peripheral surface of the rear end portion of the first guide core 7A. Even when the remaining amount of the second ink 9B in the second ink reservoir 8B decreases due to the gap 12B, the ink can be reliably supplied to the rear end portion of the second guide core 7B. As a result, the first ink 9B in the second ink reservoir 8B can be exhausted.

Ink In this embodiment, the first ink reservoir 8A is filled with the black (black) first ink 9A, and the second ink reservoir 8B is gray (light ink). Second ink 9B is filled. As a result, a direct liquid type double-headed brush pen for Keigo is obtained.

It is a longitudinal cross-sectional view which shows the upward state of the 1st nib of 1st Example of this invention. It is an AA line expanded sectional view of FIG. It is a longitudinal cross-sectional view which shows the upward state of the 2nd nib of the said 1st Example. It is a longitudinal cross-sectional view which shows the 1st pen tip side of the horizontal state of the said 1st Example. It is a longitudinal cross-sectional view which shows the upward state of the 1st nib of 2nd Example of this invention. FIG. 6 is an enlarged sectional view taken along line BB in FIG. 5. FIG. 6 is an enlarged sectional view taken along the line CC of FIG. 5. It is a longitudinal cross-sectional view which shows the 1st pen tip side of the horizontal state of the said 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Double-headed writing instrument 2 Shaft cylinder 3 Partition 31 Central wall part 32 1st bottom wall part 33 2nd bottom wall part 4A 1st nib 5A 1st accommodating part 51A 1st large diameter part 52A 1st Small diameter portion 6A First ink reservoir member 7A First guide core 71A Core portion 72A Outer skin portion 8A First ink reservoir portion 9A First ink 10A First concave space 11A First rib 12A Gap 4B Second Pen tip 5B second storage portion 51B second large diameter portion 52B second small diameter portion 6B second ink reservoir member 7B second guide core 71B core portion 72B outer skin portion 8B second ink reservoir portion 9B Second ink 10B Second concave space 11B Second rib 12B Gap

Claims (5)

A partition is formed inside the shaft cylinder that is open at both ends, a first housing part that opens from one end of the shaft cylinder inside the shaft cylinder by the partition, and a second housing part that opens from the other end of the shaft cylinder; The first housing portion and the second housing portion are not in communication with each other, and a pen tip is provided at each of the opening end of the first housing portion and the opening end of the second housing portion. A double-headed writing instrument,
At least one of the first storage portion and the second storage portion is provided with an ink reservoir member connected to the pen tip of the open end behind the pen tip, and the ink reservoir member is disposed behind the ink reservoir member. A storage portion, and the ink is stored directly in the ink storage portion; the ink storage member temporarily holds the overflow ink in response to a pressure increase in the ink storage portion; and the shaft of the ink storage member A guide core that supplies ink from the ink reservoir to the pen tip in front of the ink reservoir member is inserted into the core, and the rear end portion of the guide core protrudes rearward from the rear end of the ink reservoir member. The double-headed writing instrument, wherein the rear end portion of the guide core and the ink in the ink reservoir portion are in contact with each other when the pen tip in front of the ink reservoir member is upward. A partition is formed inside the shaft cylinder that is open at both ends, a first housing part that opens from one end of the shaft cylinder inside the shaft cylinder by the partition, and a second housing part that opens from the other end of the shaft cylinder; Provided that the first housing portion and the second housing portion do not communicate with each other,
A first ink that is provided with a first nib at an opening end of the first accommodating portion and is connected to the first nib in an opening portion of the first accommodating portion behind the first nib. A reservoir member is provided, a first ink reservoir is provided in a first housing portion behind the first ink reservoir member, and the first ink is directly stored in the first ink reservoir, The first ink reservoir member temporarily holds the overflow ink corresponding to the pressure increase in the first ink reservoir, and the first ink reservoir is disposed at the axial center of the first ink reservoir member. A first guide core for supplying the first ink to the first nib is inserted, and the rear end portion of the first guide core is protruded rearward from the rear end of the first ink reservoir member. ,
A second pen tip is provided at the opening end of the second storage portion, and the second ink is connected to the second pen tip in the opening portion of the second storage portion behind the second pen tip. A reservoir member is provided, a second ink reservoir is provided in the second storage portion behind the second ink reservoir member, and the second ink is directly stored in the second ink reservoir, The second ink reservoir member temporarily holds the overflow ink in response to the pressure increase in the second ink reservoir, and the second ink reservoir is disposed on the axis of the second ink reservoir member. A second guide core for supplying the second ink to the second pen tip is inserted, and the rear end portion of the second guide core is protruded rearward from the rear end of the second ink reservoir member. ,
The rear end of the first guide core and the first ink are in contact with each other when the first nib is upward, and the rear end of the second guide core is when the second nib is upward. A double-headed writing instrument, wherein the part and the second ink are in contact with each other. The partition wall extends in the axial direction, one end of the partition wall is connected to a shaft cylinder side wall near the first ink reservoir member, and the other end of the partition wall is connected to the shaft cylinder near the second ink reservoir member. The double-headed writing instrument according to claim 2, which is connected to a side wall. The partition wall includes a central wall portion that extends in the axial direction, a first bottom wall portion that connects one end of the central wall portion to the axial cylinder side wall in the vicinity of the first ink reservoir member, and other than the central wall portion. A second bottom wall portion connecting the end and the shaft cylinder side wall in the vicinity of the second ink reservoir member;
A first concave space is formed by the first bottom wall portion and the rear end surface of the first ink reservoir member, and the rear end portion of the first guide core is positioned in the first concave space. A second concave space is formed by the second bottom wall portion and the rear end surface of the second ink reservoir member, and the rear end portion of the second guide core is positioned in the second concave space. The double-headed writing instrument according to claim 3. A first rib extending in the axial direction is formed on the inner surface of the axial tube side wall or the first bottom wall portion constituting the first concave space, and the rear end portion of the first rib and the first guide core is formed. Form a gap with capillary force between the outer peripheral surface,
A second rib extending in the axial direction is formed on the inner surface or the second bottom wall portion of the axial tube side wall constituting the second concave space, and the rear end portion of the second rib and the second guide core is formed. The double-headed writing instrument according to claim 4, wherein a gap having a capillary force is formed between the outer peripheral surface and the outer peripheral surface.

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