JP2607229Y2 - Writing implement - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to the improvement of writing instruments,
In particular, the present invention relates to a writing implement that is capable of preventing the phenomenon of ink accumulation on a pen body in a writing implement using low-viscosity ink.

In a writing implement of the ink supply system, when the pressure in the ink storage cylinder is reduced due to the consumption of ink for writing or the like, air is automatically supplied to the ink storage cylinder in accordance with the consumption of ink. What has been proposed in recent years has been proposed so that writing can be continued.
Even if the ink inside the ink container rises due to the temperature rise during writing and the excess ink flows out of the ink container during writing, the excessive amount of ink that has flowed out is temporarily stored in the pen core. As the pressure in the ink storage cylinder decreases to the normal pressure, the excess ink temporarily stored in the pen core is automatically returned to the ink storage cylinder. ing.

[0003] However, this writing instrument sometimes hinders ink supply or backflow into the ink storage cylinder in response to pressure changes in the ink storage cylinder caused by various causes. In particular, in writing instruments such as marker pens, felt pens, and felt pens that use low-viscosity ink, ink that is excessively discharged due to an increase in pressure in the ink storage cylinder caused by a rise in temperature or the like stays in the pen core. When the pen body is excessively supplied without being supplied, the pen body has a phenomenon of first accumulation. This stagnant phenomenon not only hinders a good writing condition, but also, in extreme cases, causes the ink to drop. Also,
Even if the pressure in the ink container drops to the normal pressure, the excess ink temporarily staying in the pen core remains without flowing back into the ink container, which adversely affects subsequent writing And the writing implement itself may be adversely affected. The present invention has been completed in order to solve the above-mentioned problems, and its purpose is to exactly prevent pressure accumulation in the ink storage cylinder and prevent the ink accumulation phenomenon in the pen body. It is another object of the present invention to provide a writing implement which can keep a pen body in a state where good writing can always be performed.

In order to achieve the above object, according to the present invention, a front barrel, an ink storage barrel supported at a rear end portion of the front barrel, and a substantially cylindrical shape inside the front barrel are provided. A substantially cylindrical pen body holding member disposed via the pen core, and an ink guide core extending rearward along the central axis of the pen body holding member and having a rear end portion facing the ink storage cylinder; A pen body supported by the tip of the pen body holding member in contact with the tip of the ink guide core, and the pen body holding member is formed with an ink retaining portion.

[0005] In the invention according to the second aspect, the ink retaining portion is formed on at least one of the portion of the pen body holding member closer to the ink storage cylinder or the pen body.
According to the third aspect of the present invention, the ink retaining portion is formed in an axial slit shape on the outer peripheral surface of the pen body holding member. In the invention according to claim 4, the ink retaining portion is configured as a space defined by a rib extending in the axial direction on the outer periphery of the pen body holding member. In the invention according to claim 5, the pen body holding member has an ink through hole formed at a substantially middle portion in the longitudinal direction, and the pen core has an air vent groove and the air vent groove near the ink storage cylinder. And an ink retaining portion formed in a portion of the pen body holding member near the ink storage cylinder communicates with the ink through hole of the pen body holding member and the air vent groove of the pen core. are doing. In the device according to claim 6,
An ink retaining portion formed at a portion of the pen body holding member near the pen body is formed on the inner peripheral surface of the pen body holding member.

[0006]

According to the present invention, even if the pressure inside the ink container increases due to a rise in temperature during writing or the like and the ink excessively flows out of the ink container, the excessively flowing ink is used as a pen body holding member. Since the ink can be temporarily stored in the ink retaining portion provided in the pen body, it is possible to reliably prevent the ink accumulation phenomenon in the pen body. Also, as the pressure increased in the ink container decreases to the normal pressure, the temporarily stored excess ink can be reliably returned to the ink container. It is possible to prevent the ink accumulation phenomenon and keep the pen body in a state where good writing can always be performed. Therefore, according to the present invention, it is possible to reliably prevent the phenomenon of first-hand accumulation in the pen body in accordance with the pressure state in the ink storage cylinder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a writing instrument according to the present invention will be described below with reference to the drawings. The writing instrument according to the present invention includes a rear barrel 70, a front barrel 20 having a rear end fitted to the front end of the rear barrel 70, and a rear barrel supported by the rear end of the front barrel 20. An ink storage tube 80 built in the shaft tube 70;
0, a substantially cylindrical pen body holding member 50 disposed via a substantially cylindrical pen core 30, and a rear end portion 60 b extending rearward along a central axis of the pen body holding member 50 to form an ink storage cylinder. 80
An ink guide wick 60 facing the inside;
And the pen body 40 held at the tip of the pen body holding member 50 in contact with the tip 60a of the pen.

The pen core 30 is inserted concentrically into the barrel barrel 20, and the outer periphery of the pen core 30 is formed in a comb shape or a spiral shape. A liquid groove 32 and an air groove 33 extending in the axial direction are provided on the outer periphery of the pen core 30. Further, the pen core 30 has an air vent groove 35, a ventilation hole 36 provided near the ink storage cylinder 80 of the air vent groove 35, and an ink through hole provided at a substantially intermediate portion in the longitudinal direction of the pen core 30. 37
And A substantially cylindrical pen body holding member 50 passes through the substantially cylindrical pen core 30 in the axial direction. Screw portions 50a and 30a that are screwed to each other are formed on the outer periphery of the rear end of the pen body holding member 50 and the inner periphery of the rear end of the pen core 30, respectively. A step 30b is formed on the inner periphery of a portion near the tip of the pen core 30, and the inside diameter of the tip of the pen core 30 is enlarged from the step 30b. Further, a step 50b is also formed on the outer periphery of the substantially middle portion of the pen body holding member 50,
The outer diameter of the pen body holding member 50 is increased toward the distal end portion from the step 50b. When the pen body holding member 50 is connected to the pen core 30 by screwing the screw part 50a of the pen body holding member 50 to the screw part 30a of the pen core 30, the step part 50b of the pen body holding member 50
Is configured to closely contact the step portion 30b of the pen core 30. Also, between the outer periphery of the enlarged tip portion of the pen body holding member 50 and the inner periphery of the enlarged tip portion of the pen core 30,
An annular ventilation space 31 is provided. The rear end of the front barrel 20 fitted into the front end of the rear barrel 70 has a rear barrel 7
A boss portion 34 is provided which protrudes into the inside. The ink storage cylinder 80 incorporated in the rear barrel 70 is supported by the boss 34 by fitting the tip of the ink storage barrel 80 to the boss 34 of the front barrel 20.

The pen body holding member 50 is formed in a substantially cylindrical shape as described above, and the central cylindrical hole extending in the axial direction has a large-diameter front side hole and a continuous rearward from the front side hole. A rear hole 52 having a small diameter is provided. The rear hole 52 is aligned with a hole of the boss 34 of the front barrel 20. The pen body 40 is supported by the pen body holding member 50 by inserting the base of the pen body 40 into the front hole of the pen body holding member 50. An ink guide core 60 is inserted into the rear side hole 52 of the pen body holding member 50, and the ink guide core 60 extends rearward and penetrates the boss portion 34 of the front barrel 20.
As described above, it faces the ink container 80. Also,
The tip of the ink guide core 60 is in contact with the base of the pen body 40 supported by the tip of the pen body holding member 50.

At least one of the portion of the pen body holding member 50 near the ink storage cylinder 80 and the portion near the pen body 40 is provided with an ink retaining portion. In the illustrated embodiment, ink retaining portions Ta and Tb are provided at a portion of the pen body holding member 50 near the pen body 40 and a portion of the pen body holding member 50 near the ink storage cylinder 80, respectively. Pen body 4
The ink stagnation portion Ta provided at the portion close to zero is formed on the inner peripheral surface of the pen body holding member 50, while the ink storage tube 8 is formed.
The ink stagnation portion Tb provided near the zero portion is formed on the outer peripheral surface of the pen body holding member 50. In the illustrated embodiment, the ink retaining portions Ta and Tb are formed as slits extending in the axial direction. However, the present invention is not limited thereto. For example, ribs extending in the axial direction of the pen body holding member 50 may be used. May be a space defined by Further, a plurality of ink retaining portions Ta and Tb may be provided on the inner peripheral surface and the outer peripheral surface of the pen body holding member 50, respectively.

An ink retaining portion Tb provided in a portion of the pen body holding member 50 near the ink storage cylinder 80 has an ink through hole 51 provided in an intermediate portion in the longitudinal direction of the pen body holding member 50 and a pen core. A vent hole 36 formed in a portion of the air vent groove 35 provided in the nozzle 30 near the ink storage cylinder 80;
Similarly, it is communicated with an ink through hole 37 provided in the pen core 30.

As described above, the ink retaining portion Tb provided at the portion of the pen body holding member 50 near the ink storage cylinder 80 is provided.
Communicates with the air hole 36 provided in the air vent groove 35 of the pen core 30 near the ink storage cylinder 80, so that the ink is quickly circulated to the comb-shaped portion of the pen core 30 and the ink accumulation portion While it can temporarily stay in Tb,
When the pressure in the ink storage tube 80 decreases, the ink temporarily stored in the ink storage unit Tb can be sequentially returned to the ink storage tube 80 by the capillary action exerted stepwise by the above-described units.

Reference numeral 55 in the drawing denotes a pen body holding member 5.
0 shows an annular convex portion provided on the outer periphery of the pen body holding member 50 adjacent to a portion of the screw portion 50a provided at the rear end of the pen body 40 near the pen body 40. The annular convex portion 55 is in close contact with the inner peripheral surface of the pen core 30 and the pen body holding member 50.
This function prevents excess ink from flowing out to the pen core 30 side by capillary action from the screw portion of the screw portion 50a of the pen core 30 and the screw portion 30a of the pen core 30.

Further, reference numeral 10 in the drawing denotes a pen body 40.
5 shows a cap fitted on the front barrel 20 in order to prevent evaporation of ink from the periphery thereof. Cap 40
Are a cap body having a substantially U-shaped vertical cross section, a pen body covering cup 11 provided concentrically and integrally inside the closed end of the cap body, and a blocking member arranged to be able to advance and retreat inside the cap body. And a cylindrical body 12. A spring receiving portion 13 is formed on the outer periphery of the blocking cylinder 12, and a coil spring 15 is disposed between the spring receiving portion 13 and a closed end of the cap body. The body 12 is constantly urged toward the opening end of the cap body.

An engaging projection 10a is formed on the inner peripheral surface near the opening end of the cap body, and an engaging projection 20a is also provided on the outer peripheral surface near the base of the front barrel 20 in connection therewith. . Thereby, when the cap body is fitted on the front barrel 20, the locking projection 10a of the cap 10
0, so that the cap 10 is resiliently engaged with the locking projection 20a.
It is possible to surely fit the positioning to zero. A stopper 10b is integrally formed on the inner peripheral surface of a substantially central portion of the cap body in the axial direction. Further, a plurality of ventilation holes 17 are formed at the closed end of the cap body so as to surround the pen body covering cup 11.

The shut-off cylinder 12 is a cup 1 of the shut-off cylinder 12.
A first seal portion 12a provided at one end, and a second seal portion 12 provided at an opposite end of the shut-off cylinder 12.
b. In addition, a projection 14 is provided on the outer peripheral surface of a portion near the second seal portion 12b of the blocking cylinder 12. In the illustrated embodiment, the seal portions 12a, 12a
b is formed in a substantially beak shape with a sharply pointed tip. When the cap body is fitted and moved onto the tip barrel 20, the pen core 3
0 pushes against the sharp tip of the second seal portion 12b while repelling the blocking cylinder 12 to the back of the cap body against the resilience of the coil spring 15 so that the first seal portion 1
The sharp tip of 2a comes into contact with the opening-side end surface of the pen body covering cup 11. In the process, cap 10
The cap 10 does not come off from the front barrel 20 because the locking projection 10a of the first member gets over the locking projection 20a of the front barrel 20 and resiliently engages with the locking projection 20a.
In this state, the first seal 1
The sharp tip of 2 a is in contact with the opening end face of the pen body covering cup 11, and the sharp tip of the second seal portion 12 b of the blocking cylinder 12 is maintained in contact with the tip face of the pen core 30. Therefore, the pen body 40 and its surroundings, including the ventilation space 31 between the pen body holding member 50 and the pen core 30, are completely sealed in the blocking cylinder 12. Therefore, evaporation of the ink from the pen body 40 and its surroundings and the ventilation space 31 can be reliably prevented. When the cap main body is detached from the front barrel 20, the resilient force of the coil spring 15 causes the blocking cylinder 12 to resiliently move toward the opening end of the cap main body. By contacting the stopper 10b, the blocking cylinder 12 is locked in the cap main body without jumping out of the cap main body. The blocking cylinder 12 is a coil spring 1
5, when the first seal portion 12a is resiliently moved toward the opening end of the cap main body by the distance from the opening side end surface of the pen body covering cup 11,
The inside of the cap 2 communicates with the vent hole 17 of the cap body, and as a result, a vent path penetrating the entire cap 10 is formed.

Incidentally, the pen core 30 and the pen body covering cup 1
1 is preferably made of an elastic material such as synthetic rubber or polyethylene from the viewpoint of improving the sealing effect. Further, in the illustrated embodiment, the screw portions 30a and 50a are formed on the inner peripheral surface of the rear end of the pen core 30 and the outer peripheral surface of the rear end of the pen body holding member 50, respectively. .

In the writing implement according to the present invention configured as described above, the ink in the ink storage cylinder 80 is supplied to the pen body 40 via the ink guide core 60. The annular ventilation space 31 provided between the pen body holding member 50 and the pen core 30 can prevent the pressure inside the ink storage cylinder 80 from being reduced due to the consumption of ink, and can also change the air pressure and increase the temperature. Therefore, it is possible to prevent an increase in the pressure in the ingi storage cylinder 80 due to the above, so that the ink supply to the pen body 40 can be appropriately performed. Further, even if the ink excessively flows out due to an increase in the pressure in the ink storage cylinder 80, the excessively flowing out ink can be temporarily stored in the ink retaining portions Ta and Tb provided in the pen body holding member 50. Therefore, the ink stagnation phenomenon in the pen body 40 can be reliably prevented. Further, as the pressure increased in the ink container 80 decreases to the normal pressure, the temporarily accumulated excess ink can be surely returned to the ink container 80. In this case, the pen body 40 can be kept in a state where the ink accumulation phenomenon can be prevented and good writing can always be performed.

[0019]

As described above, in the writing implement according to the present invention, even if the ink in the ink storage cylinder excessively flows out of the ink storage cylinder due to an increase in the pressure inside the ink storage cylinder due to a rise in temperature during writing or the like, the excess The ink that has flowed out can be sufficiently stored in the ink retaining section provided in the pen body holding member, so that the ink accumulation phenomenon in the pen body can be reliably prevented. Also, as the pressure increased in the ink container decreases to the normal pressure, the temporarily stored excess ink can be surely returned to the ink container. To prevent the ink accumulation phenomenon
The pen body can be kept in a state where good writing can always be performed. Therefore, according to the present invention, it is possible to provide a writing instrument which can accurately prevent the ink accumulation phenomenon in the pen body in accordance with the pressure state in the ink storage cylinder.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of a writing instrument according to the present invention.

[Explanation of symbols]

 Reference Signs 20 tip barrel 30 pen core 40 pen body 50 pen body holding member 60 ink guide core 80 ink storage barrel Ta, Tb ink retention section

Claims (6)

(57) [Scope of request for utility model registration] 1. A front barrel, an ink storage barrel supported at a rear end of the front barrel, and a substantially cylindrical pen disposed in the front barrel via a substantially cylindrical pen core. A body holding member, an ink guide wick extending rearward along the central axis of the pen body holding member, and a rear end facing the inside of the ink storage cylinder, and in contact with the tip of the ink guide wick. A writing implement comprising: a pen body supported at a tip end of the pen body holding member; and an ink retaining section formed in the pen body holding member. 2. The writing instrument according to claim 1, wherein the ink retaining portion is formed at least in a portion of the pen body holding member near the ink storage cylinder or a portion near the pen body. 3. The writing implement according to claim 1, wherein the ink retaining section is formed in an axial slit shape on an outer peripheral surface of the pen body holding member. 4. The writing instrument according to claim 1, wherein the ink retaining section is formed as a space defined by an axially extending rib on an outer periphery of the pen body holding member. 5. The pen body holding member has an ink penetrating hole formed at a substantially middle portion in the longitudinal direction, and the pen core is formed in an air vent groove and a portion of the air vent groove near the ink storage cylinder. A penetrating hole, and the ink retaining portion formed in a portion of the pen body holding member near the ink storage cylinder communicates with the ink through hole of the pen body holding member and the air vent groove of the pen core. 3. The method according to claim 2, wherein
Writing instrument described in. 6. The pen body holding member according to claim 2, wherein the ink retaining portion formed at a portion of the pen body holding member near the pen body is formed on an inner peripheral surface of the pen body holding member. Writing implement.