JP2008126553A - Retractable ballpoint pen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retractable ball point pen capable of surely preventing a leakage out of ink from the distal end of a ballpoint pen tip. <P>SOLUTION: A refill 5 having a ballpoint pen tip 51 at the front end is accommodated in a shaft tube 2 movably in a fore and aft direction. A resilient body 3 biasing the refill 5 rearward is accommodated in the shaft tube 2. The retractable ballpoint pen has a retracting mechanism 4 making the ballpoint pen tip 51 retractable from the distal end hall 21 of the shaft tube 2. The ink 52 and following body 53 are accommodated in an ink accommodating portion 6 of the refill 5. A valve portion 8 is arranged in the ink feeding path in the refill 5. The valve portion 8 is opened and it makes possible to feed the ink to the distal end of the ball point pen tip 51 with a pen tip protruded. While the valve portion 8 is closed and it makes impossible to feed the ink to the distal end of the ballpoint pen tip 51 with the pen tip retracted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a retractable ballpoint pen. More specifically, the present invention relates to a retractable ballpoint pen having a retractable mechanism in which a refill is accommodated in a shaft cylinder so as to be movable in the front-rear direction, and a ballpoint pen tip of the refill can be protruded and retracted from a front end hole of the shaft cylinder.

Conventionally, in this kind of retractable ballpoint pen, Patent Document 1 discloses that the back end opening of the refill is sealed when the pen tip is in the storage position in order to prevent ink from leaking out of the pen tip when not in use. A structure is disclosed.

In Patent Document 2, a spring is inserted into a chip inner hole for the purpose of tightly bringing the tip ball into the inner edge of the ball holding portion of the chip and preventing direct current, reverse flow, and drying of the ink. A configuration is disclosed in which a push body that presses the tip ball and has an outer shaft portion that appropriately protrudes from the rear end of the ink containing tube presses the rear end of the spring.
JP 2004-82431 A Japanese Patent No. 3553699

However, since the retractable ballpoint pen of Patent Document 1 is configured to prevent air from being taken in from the rear end opening of the refill when not in use, when an impact such as a drop is applied in the pen tip immersion state, Ink movement cannot be sufficiently prevented, and the ink may move to the pen tip side and leak from the pen tip.

Further, the retractable ballpoint pen of Patent Document 2 is in a state where the tip ball is in close contact with the inner edge of the ball holding portion of the chip for a long period of time when the pen tip is immersed in the shaft cylinder. If this is maintained, the ball at the tip of the ball-point pen tip may fall off from the ball holding portion, which may cause ink leakage from the front end of the ball-point pen tip.

The present invention solves the above-described conventional problems, and an object of the present invention is to provide a retractable ballpoint pen that can reliably prevent leakage of ink from the front end of the ballpoint pen tip. In the present invention, the pen tip immersion state means a state in which the front end of the ballpoint pen tip is housed in the shaft tube. The pen tip protruding state refers to a state in which the front end of the ballpoint pen tip protrudes outside from the front end of the shaft cylinder.

<First invention>
In the first invention of the present application, a refill 5 having a ballpoint pen tip 51 at its front end is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, and the projectile 3 for urging the refill 5 rearward is disposed in the shaft cylinder 2. A retractable ballpoint pen that is housed in and includes a retractable mechanism 4 that allows the ballpoint pen tip 51 to be retracted and retracted from the front end hole 21 of the shaft cylinder 2, wherein the refill 5 holds the ball rotatably at the front end. A ballpoint pen tip 51 and an ink container 6 provided with the ballpoint pen tip 51 at the front end. In the ink container 6, the ink 52 is disposed at the rear end of the ink 52 and consumed by the ink 52. And a follower 53 that moves forward, and a valve portion 8 is provided in the ink supply path in the refill 5. When the pen tip protrudes, the valve portion 8 opens to supply ink to the front end of the ballpoint pen tip 51. But Becomes ability, whereas, in the pen tip retracted state, the valve unit 8 is closed, characterized in that the ink supply to the ballpoint pen tip 51 forward is disabled. (Corresponding to FIGS. 1 to 11)

In the retractable ballpoint pen 1 according to the first aspect of the present invention, the ink supply to the front end of the ballpoint pen tip 51 is blocked by the valve portion 8 in the pen tip immersing state. Even if stored for a long period of time, it is possible to reliably prevent ink from leaking from the front end of the ballpoint pen tip 51.

<Second invention>
According to a second invention of the present application, in the first invention, the valve portion 8 is fixed to the inner wall of the ink containing portion 6, the valve seat 81 is disposed in front of the valve seat 81, and the valve seat 81 A valve body 82 that can be closely attached to the valve body 82. The valve body 9 is accommodated in the refill 5 in front of the valve body 82, and the valve body 9 urges the valve body 82 backward. A retracting mechanism 4 having a pressing portion 41 capable of pressing the refill 5 forward is provided in the shaft cylinder 2 behind the refill 5, and the valve body 82 and the pressing portion 41 are interposed between the valve body 82 and the pressing portion 41. A rod-shaped portion 83 that connects the pressing portion 41 is provided, the contact wall portion 22 is provided on the inner wall of the shaft cylinder 2, and the valve element 82 and the valve seat 81 are separated from each other in the protruding state of the pen tip. When the part 8 is opened and the pen tip is in the immersive state, the valve element 82 and the valve seat 81 are in close contact with each other. As well as chains, the contact wall 22, characterized by comprising regulating the rearward movement of the contact and refill 5 and refill 5. (Corresponding to FIGS. 1 to 5)

In the retractable ballpoint pen 1 according to the second aspect of the present invention, the contact wall portion 22 of the inner wall of the shaft tube 2 is in contact with the refill 5 in the pen tip immersion state, and the rearward movement of the refill 5 is restricted. Due to the rearward urging of the body 9, a strong close contact state between the valve body 82 and the valve seat 81 is obtained, and as a result, the valve portion 8 can be reliably closed in the pen tip immersion state.

<Third invention>
According to a third invention of the present application, in the first invention, the side wall of the ink containing portion 6 behind the ball-point pen tip 51 is provided with a stretchable wall portion 7 that can be stretched in the front-rear direction, and the ink in front of the stretchable wall portion 7 is provided. The inner wall of the storage portion 6 and the inner wall of the ink storage portion 6 behind the stretchable wall portion 7 are connected by a connecting portion 65 b, and the valve portion 8 of the ink storage portion 6 in front of the stretchable wall portion 7 is connected. A valve seat 81 fixed to the inner wall and a valve body 82 disposed rearward of the valve seat 81 and capable of being in close contact with the valve seat 81 are provided in the refill 5 behind the valve body 82. The rear end of the valve bullet member 9 is locked to the inner wall of the ink containing portion 6 behind the telescopic wall portion 7, and the front end of the valve bullet member 9 contacts the valve body 82. The valve body 82 is urged forward, and an inner step 73 is provided on the inner wall of the intermediate portion of the telescopic wall portion 7. The valve body 82 urged forward by the valve projecting body 9 is locked to the portion 73, and the stretchable wall portion 7 in front of the inner stepped portion 73 is defined as a first stretchable wall portion 71. The stretchable wall portion 7 behind the inner stepped portion 73 is a second stretchable wall portion 72, and an outer stepped portion 74 is provided on the outer wall between the first stretchable wall portion 71 and the second stretchable wall portion 72, An abutting wall portion 22 is provided on the inner wall of the shaft cylinder 2, and in the pen tip protruding state, the abutting wall portion 22 and the outer stepped portion 74 abut, the first telescopic wall portion 71 extends and When the second telescopic wall portion 72 contracts, the valve body 82 and the valve seat 81 are separated from each other, the valve portion 8 is opened, and the abutting wall portion 22 and the The outer stepped portion 74 is separated, the first stretchable wall portion 71 contracts and the second stretchable wall portion 72 extends, The body 82 and the valve seat 81 is close, the valve unit 8 is characterized by being closed. (Corresponding to FIGS. 6 to 11)

In the retractable ballpoint pen 1 according to the third aspect of the invention, since the valve element 82 is urged forward by the valve projectile 9, when an impact such as a drop is applied in the pen tip immersion state and the pen tip downward state Since the valve body 82 is further tightly brought into close contact with the valve seat 81 by the ink in the ink containing portion 6, there is no possibility that the valve portion 8 is opened. As a result, the valve portion 8 can be reliably closed in the pen tip immersion state.

The retractable ballpoint pen of the present invention can reliably prevent ink leakage from the front end of the ballpoint pen tip.

<First Embodiment>
A first embodiment of the retractable ballpoint pen 1 of the present invention is shown in FIGS.
The retractable ballpoint pen 1 according to the present embodiment includes a refill 5 having a ballpoint pen tip 51 at a front end, a shaft cylinder 2 that houses the refill 5 therein, and a projectile 3 that biases the refill 5 backward. And a retracting mechanism 4 for moving the refill 5 forward and backward.

The shaft tube 2 has a front end hole 21 at the front end. Through the front end hole 21, the front end of the ballpoint pen tip 51 protrudes outside and is immersed therein. An abutting wall portion 22 that can abut against the outer wall of the refill 5 (specifically, the rear end of the refill 5) is formed on the rear inner wall of the shaft cylinder 2. Here, the contact wall portion 22 is formed of a rib extending in the axial direction. In addition, a rear end hole is formed at the rear end of the shaft cylinder 2, and the operation portion 42 of the retracting mechanism 4 projects outside from the rear end hole.

The shaft cylinder 2 includes a cylindrical front shaft 23 and a cylindrical rear shaft 24 connected to the rear end portion of the front shaft 23 by screwing. The front end hole 21 is formed at the front end of the front shaft 23. The abutting wall portion 22 is formed on the inner wall of the rear shaft 24, and a rear end hole is formed at the rear end of the rear shaft 24.

An elastic body 3 (specifically, a compression coil spring) is accommodated in the shaft cylinder 2. The front end of the projectile 3 is locked to the inner wall of the shaft tube 2 (specifically, the front end inner wall behind the front end hole 21 of the shaft tube 2). The rear end of the projectile 3 is locked to a step 54 on the outer surface of the refill 5. The refill 5 is constantly urged backward by the bullet 3.

The in / out mechanism 4 is a knock type in which the refill 5 is advanced by pushing forward the operating portion 42 that protrudes from the rear end, and the pen tip protrudes. In addition to this, the in / out mechanism 4 may be a rotary type in which the pen tip is in / out by rotating the operation unit 42 or the shaft tube 2. The intruding mechanism 4 has at least a pressing portion 41 that presses the refill 5 forward. The pressing portion 41 can come into contact with the rear end of the refill 5.

The refill 5 includes a ball-point pen tip 51 and an ink container 6 provided with the ball-point pen tip 51 at the front end. The ink storage unit 6 includes a pen tip holding cylinder 62 to which the rear end of the ballpoint pen tip 51 is fixed, and an ink storage cylinder 61 to which the rear end of the pen tip holding cylinder 62 is fixed. In the ink containing portion 6, an ink 52 (specifically, a low-viscosity water-based ink, a water-based gel ink, or a low-viscosity oil-based ink) is disposed at the rear end of the ink 52 and is consumed as the ink 52 is consumed. A follower 53 (specifically, a high-viscosity fluid) that moves forward is accommodated. A rear end of the ink containing cylinder 61 is opened, and a tail plug 55 made of a cylinder having inner holes penetrating in the front and rear is fixed thereto.

A valve portion 8 including a valve seat 81 and a valve body 82 is accommodated in the front portion of the ink accommodating portion 6. A valve seat 81 formed of an annular protrusion is formed on the inner wall of the ink containing portion 6 (specifically, the inner wall of the pen tip holding cylinder 62). A valve element 82 that can be brought into close contact with the valve seat 81 is accommodated and disposed in the ink accommodating portion 6 (specifically, in the pen tip holding cylinder 62) in front of the valve seat 81. In the ink containing portion 6 in front of the valve body 82 (specifically, in the pen tip holding cylinder 62 and in the ballpoint pen tip 51), a valve elastic body 9 (specifically, a compression coil spring) is accommodated. The

A rod-like portion 83 is accommodated in the ink containing portion 6, and the front end of the rod-like portion 83 is connected to the valve body 82 (specifically, the front end of the rod-like portion 83 and the valve body 82 are integrally connected). And the rear end of the rod-like portion 83 is brought into contact with the pressing portion 41 of the retracting mechanism 4. The rod-like portion 83 penetrates the inside of the valve seat 81 and the inside of the follower 53, and is disposed in the ink.

A ball is rotatably held at the front end of the ballpoint pen tip 51. On the inner wall of the ball-point pen tip 51, the front end of the valve bullet member 9 is locked.

In the present embodiment, the rear end opening of the ink containing portion 6 is configured to be opened and vented to the outside in the pen tip protruding state. Thereby, the space in the ink containing part 6 behind the follower 53 and the outside can be ventilated through the rear end opening of the ink containing part 6.

-Action The action of the retractable ballpoint pen 1 of the present embodiment will be described.
1 and 4 show the state at the time of writing. In this state, the rear end of the refill 5 comes into contact with the pressing portion 41 of the retracting mechanism 4, the rearward movement of the refill 5 is restricted, and the valve portion 8 is in an open state.
FIG. 2 shows a state between writing and non-writing. In this state, the rear end of the refill 5 abuts against the abutting wall portion 22 of the inner wall of the shaft tube 2, the rearward movement of the refill 5 is restricted, and the valve portion 8 is in an open state.
3 and 5 show the state when not writing. In this state, the rear end of the refill 5 abuts against the abutting wall portion 22 of the inner wall of the shaft tube 2, the rearward movement of the refill 5 is restricted, and the valve portion 8 is closed.

When the retracting mechanism 4 is operated in order to shift the pen tip protruding operation from the non-writing state (see FIG. 3) to the writing state (see FIG. 1), first the rearward biasing of the valve bullet 9 is performed. Against this, the pressing part 41 moves forward. Thereby, the pressing part 41 contacts the rear end of the refill 5, the valve body 82 and the valve seat 81 are separated, the close contact between the valve body 82 and the valve seat 81 is released, and the valve part 8 is opened. (See FIG. 2). Further, when the pressing portion 41 is advanced against the rear urging of the projectile 3, the front end of the ballpoint pen tip 51 is completely protruded from the front end of the barrel 2 (pen tip protruding state) (see FIG. 3). ). Then, the penetrating mechanism 4 maintains the pen tip protruding state, and the ink behind the valve portion 8 is supplied to the ball-point pen tip 51 through the valve portion 8 in the open state so that writing can be performed.

When the retracting mechanism 4 is operated in order to shift the pen tip immersion operation writing state (see FIG. 1) to the non-writing state (see FIG. 3), The refill 5 moves backward. As a result, the rear end of the refill 5 comes into contact with the contact wall portion 22, the rearward movement of the refill 5 is restricted, and the front end of the ballpoint pen tip 51 is completely accommodated in the shaft cylinder 2 (pen nib immersion state) ( (See FIG. 2). Further, the valve element 82 is moved rearward by the rearward urging of the valve bullet member 9, the valve element 82 and the valve seat 81 are brought into close contact with each other, and the valve portion 8 is closed (see FIG. 3). As a result, the ink behind the valve unit 8 cannot be supplied to the ballpoint pen tip 51, and ink leakage from the front end of the ballpoint pen tip 51 can be prevented.

<Second Embodiment>
A second embodiment of the retractable ballpoint pen 1 of the present invention is shown in FIGS.
The retractable ballpoint pen 1 of the present embodiment includes a refill 5 having a ballpoint pen tip 51 at a front end, a shaft cylinder 2 that accommodates the refill 5 therein, and a projectile 3 that urges the refill 5 backward. And a retracting mechanism 4 for moving the refill 5 forward and backward.

The shaft tube 2 has a front end hole 21 at the front end. Through the front end hole 21, the front end of the ballpoint pen tip 51 protrudes outside and is immersed therein. An abutting wall portion 22 that can abut against the outer wall of the refill 5 (specifically, the outer stepped portion 74 of the refill 5) is formed on the inner wall of the front portion of the shaft cylinder 2. A rear end hole is formed at the rear end of the shaft cylinder 2, and the operation portion 42 of the projecting mechanism 4 projects from the rear end hole to the outside.

The shaft cylinder 2 includes a cylindrical front shaft 23 and a cylindrical rear shaft 24 connected to the rear end portion of the front shaft 23 by screwing. The front end hole 21 is formed at the front end of the front shaft 23, and the contact wall portion 22 is formed on the inner wall of the front shaft 23. A rear end hole is formed at the rear end of the rear shaft 24.

An elastic body 3 (specifically, a compression coil spring) is accommodated in the shaft cylinder 2. The front end of the elastic body 3 is locked to the inner wall of the shaft tube 2 (specifically, the abutting wall portion 22 behind the front end hole 21 of the shaft tube 2). The rear end of the projectile 3 is locked to a step 54 on the outer surface of the refill 5. The refill 5 is constantly urged backward by the bullet 3.

The in / out mechanism 4 is a knock type in which the refill 5 is advanced by pushing forward the operating portion 42 that protrudes from the rear end, and the pen tip protrudes. In addition to this, the in / out mechanism 4 may be a rotary type in which the pen tip is in / out by rotating the operation unit 42 or the shaft tube 2.

The refill 5 includes a ball-point pen tip 51 and an ink container 6 provided with the ball-point pen tip 51 at the front end. The ink container 6 includes a pen tip holding cylinder 62 to which the rear end of the ballpoint pen tip 51 is fixed, an extendable cylinder 63 to which the rear end of the pen tip holding cylinder 62 is fixed, and a rear end of the extendable cylinder 63. The connection cylinder 64 is fixed, and the ink storage cylinder 61 is fixed to the rear end of the connection cylinder 64.

Ink wall 6 inner wall (specifically, pen point holding cylinder 62 inner wall) in front of the telescopic wall 7, and ink container 6 inner wall (specifically, connection cylinder 64 inner wall) behind the telescopic wall 7 Are coupled by a rod-shaped coupling body 65. The connecting body 65 includes a plurality of (specifically, four) ribs 65a in the axial direction at the front end. A disc-shaped valve seat 81 having a plurality of (specifically, four) valve holes is integrally formed at the rear end of the rib 65a of the connecting body 65. A rod-like connecting portion 65 b is formed behind the valve seat 81. The rear end of the rod-like connecting portion 65b is fixed to a support wall portion 64a formed integrally with the inner wall of the connection tube 64. The support wall portion 64a is connected to the inner wall of the connection tube 64 by a plurality of (specifically, four) ribs.

A valve body 82 is accommodated in the telescopic cylinder 63 so as to be movable in the front-rear direction. The valve body 82 has a central hole in the axial direction, a seal portion that can be in close contact with the valve seat 81 at the front end, and a spring that includes a plurality (specifically, four) radial protrusions at the rear end. Receiving portion 82a. The connecting portion 65b is loosely inserted into the center hole. A valve resilient body 9 (specifically, a compression coil spring) is accommodated in the telescopic cylinder 63 behind the valve body 82. The front end of the valve bullet member 9 abuts on the spring receiving portion 82a, and the rear end of the valve bullet member 9 abuts on a support wall portion 64a formed integrally with the inner wall of the connection tube 64. Is done. The valve element 82 is biased forward by the valve bullet 9.

The telescopic cylinder 63 includes a front end cylinder part fixed to the outer wall of the pen tip holding cylinder 62, a rear end cylinder part fixed to the outer wall of the connection cylinder 64 part, and the front end cylinder part and the rear end cylinder part. It consists of the expansion-contraction wall part 7 (specifically a bellows-like side wall) formed in between. On the outer wall between the telescopic wall portion 7 and the rear end wall portion, a step portion 54 is formed on which the rear end of the elastic body 3 can be locked.

An inner stepped portion 73 is formed at an intermediate portion of the telescopic wall portion 7 so that the valve body 82 biased forward can be locked. The stretchable wall portion 7 includes a first stretchable wall portion 71 in front of the inner stepped portion 73 and a second stretchable wall portion 72 in the rear of the inner stepped portion 73. The outer diameter of the second telescopic wall portion 72 is set larger than the outer diameter of the first telescopic wall portion 71. An outer stepped portion 74 is formed on the outer wall between the first stretchable wall portion 71 and the second stretchable wall portion 7. When the pen tip protrudes, the outer stepped portion 74 comes into contact with the contact wall portion 22 of the inner wall of the shaft tube 2.

In the ink containing portion 6, an ink 52 (specifically, a low-viscosity water-based ink, a water-based gel ink, or a low-viscosity oil-based ink) is disposed at the rear end of the ink 52 and is consumed as the ink 52 is consumed. A follower 53 (specifically, a high-viscosity fluid) that moves forward is accommodated. A rear end of the ink containing cylinder 61 is opened, and a tail plug 55 made of a cylinder having inner holes penetrating in the front and rear is fixed thereto.

A ball is rotatably held at the front end of the ballpoint pen tip 51.

In the present embodiment, the rear end opening of the ink containing portion 6 is configured to be opened and vented to the outside in the pen tip protruding state. Thereby, the space in the ink containing part 6 behind the follower 53 and the outside can be ventilated through the rear end opening of the ink containing part 6.

-Action The action of the retractable ballpoint pen 1 of the present embodiment will be described.
6, 9 and 10 show the state at the time of writing. In this state, the pen tip is in a state of projecting outside from the front end hole 21 of the shaft tube 2, the contact wall portion 22 and the outer stepped portion 74 are in contact, and the valve portion 8 is in an open state.
FIG. 7 shows a state between writing and non-writing. In this state, the pen tip is slightly immersed in the shaft cylinder 2, the contact wall portion 22 and the outer stepped portion 74 are in contact, and the valve portion 8 is in a closed state.
8 and 11 show the state when not writing. In this state, the pen tip is completely immersed in the shaft cylinder 2, the contact between the contact wall portion 22 and the outer stepped portion 74 is released, and the valve portion 8 is closed.

-When the retracting mechanism 4 is operated in order to shift from the pen tip protruding operation non-writing state (see FIG. 8) to the writing state (see FIG. 6), first, it resists the rear urging of the projectile 3 Then, the refill 5 moves forward. As a result, the outer stepped portion 74 of the telescopic wall portion 7 and the abutting wall portion 22 of the inner wall of the shaft cylinder 2 abut, and the front end of the ballpoint pen tip 51 slightly protrudes to the outside (see FIG. 7). Further, when the pressing portion 41 is advanced against the rear urging of the projectile 3, the outer stepped portion 74 of the telescopic wall portion 7 is pressed rearward by the abutting wall portion 22 of the inner wall of the shaft tube 2. Thereby, the first elastic wall portion 71 extends in the front-rear direction, the second elastic wall portion 72 contracts in the front-rear direction, and the valve body 82 locked to the inner stepped portion 73 of the elastic wall portion 7 includes: It is pushed backward against the forward biasing of the valve bullet 9. Thereby, the close contact between the valve body 82 and the valve seat 81 is released, and the valve portion 8 is opened. At the same time, the front end of the ballpoint pen tip 51 protrudes to the outside (see FIG. 6). Then, the penetrating mechanism 4 maintains the pen tip protruding state, and the ink behind the valve portion 8 is supplied to the ball-point pen tip 51 through the valve portion 8 in the open state so that writing can be performed.

-When the retracting mechanism 4 is operated in order to shift from the pen tip immersion operation writing state (see FIG. 6) to the non-writing state (see FIG. 8), The refill 5 moves backward. As a result, the front end of the ball-point pen tip 51 is slightly immersed, and the pressing force of the abutting wall portion 22 of the inner wall of the shaft tube 2 against the outer stepped portion 74 of the telescopic wall portion 7 is weakened. By urging, the first stretchable wall portion 71 contracts in the front-rear direction, and the second stretchable wall portion 72 extends in the front-rear direction. Along with this, the valve body 82 locked to the inner stepped portion 73 of the telescopic wall portion 7 moves forward, the valve body 82 and the valve seat 81 come into close contact with each other, and the valve portion 8 is closed (see FIG. 7). . Further, the refill 5 is moved rearward by the rear urging of the projectile 3, and the front end of the ballpoint pen tip 51 is completely immersed in the shaft cylinder 2 (see FIG. 8). In a state where the valve portion 8 is closed, the ink behind the valve portion 8 cannot be supplied to the ballpoint pen tip 51, and ink leakage from the front end of the ballpoint pen tip 51 can be prevented.

In the first embodiment and the second embodiment of the present invention, the ball at the front end of the ball-point pen tip 51 is urged forward by a projectile or the like, and the front edge of the front end of the ball-point pen tip 51 is not written. It is also possible to add a configuration in which the ball is in close contact with the ball.

It is a longitudinal cross-sectional view which shows the state at the time of writing of 1st Embodiment of the retractable ball-point pen of this invention. It is a longitudinal cross-sectional view which shows the state between the time of writing and the time of non-writing of the retractable ball-point pen of FIG. It is a longitudinal cross-sectional view which shows the state at the time of non-writing of the retractable ball-point pen of FIG. It is a principal part expanded longitudinal cross-sectional view of FIG. FIG. 4 is an enlarged vertical cross-sectional view of a main part of FIG. 3. It is a longitudinal cross-sectional view which shows the state at the time of writing of 2nd Embodiment of the retractable ball-point pen of this invention. It is a longitudinal cross-sectional view which shows the state between the time of writing and the time of non-writing of the retractable ball-point pen of FIG. It is a longitudinal cross-sectional view which shows the state at the time of non-writing of the retractable ball-point pen of FIG. FIG. 7 is an enlarged vertical cross-sectional view of a main part of FIG. 6. 9A is a cross-sectional view taken along line AA in FIG. 9, FIG. 9B is a cross-sectional view taken along line BB in FIG. 9, FIG. 9C is a cross-sectional view taken along line CC in FIG. FIG. It is a principal part expanded longitudinal cross-sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Retractable ball-point pen 2 Shaft cylinder 21 Front end hole 22 Abutting wall part 23 Front shaft 24 Rear shaft 3 Ejection body 41 Intrusion mechanism 41 Press part 42 Operation part 5 Refill 51 Ball-point pen tip 52 Ink 53 Follow-up body 54 Step part 55 Tail plug 6 Ink Storage Unit 61 Ink Storage Tube 62 Pen Tip Holding Tube 63 Telescopic Tube 64 Connection Tube 64a Support Wall Portion 65 Linking Body 65a Rib 65b Connection Portion 7 Telescopic Wall Portion 71 First Telescopic Wall Portion 72 Second Telescopic Wall Portion 73 Inner step portion 74 Outer step portion 8 Valve portion 81 Valve seat 82 Valve body 82a Spring receiving portion 83 Rod-like portion 9 Bullet for valve

Claims (3)

A refill provided with a ballpoint pen tip at the front end is accommodated in the shaft cylinder so as to be movable in the front-rear direction, and a projectile for urging the refill rearward is accommodated in the shaft cylinder. A retractable ballpoint pen having a retractable mechanism that allows the chip to be retractable, wherein the refill comprises a ballpoint pen tip that rotatably holds the ball at the front end, and an ink containing portion that includes the ballpoint pen tip at the front end. The ink container contains ink and a follower disposed at the rear end of the ink and advanced as the ink is consumed. A valve is provided in the ink supply path in the refill. In the protruding state, the valve portion is opened, and ink can be supplied to the front end of the ballpoint pen tip. On the other hand, in the pen tip immersion state, the valve portion is closed, and the ink is supplied to the front end of the ballpoint pen tip. · The retractable ballpoint pen, characterized in that the supply becomes impossible. The valve portion includes a valve seat fixed to the inner wall of the ink containing portion, and a valve body disposed in front of the valve seat and capable of being in close contact with the valve seat. The projectile body is accommodated, the valve projectile body urges the valve body rearward, and a retracting mechanism having a pressing portion capable of pressing the refill forward is provided in the shaft cylinder behind the refill, Between the valve body and the pressing part, a rod-shaped part for connecting the valve body and the pressing part is provided, and an abutting wall part is provided on the inner wall of the shaft tube. The valve seat is separated, the valve portion is opened, and the valve body and the valve seat are in close contact with each other in a pen nib immersion state, the valve portion is closed, and the contact wall portion is a refill. The retractable ballpoint pen according to claim 1, wherein the pendulum is in contact with the refill and restricts rearward movement of the refill. Provided on the side wall of the ink containing part behind the ball-point pen tip is an extendable wall part that can be expanded and contracted in the front-rear direction, an inner wall of the ink containing part in front of the elastic wall part, and an inner wall of the ink containing part behind the elastic wall part, Are connected by a connecting portion, and the valve portion is fixed to the inner wall of the ink containing portion in front of the telescopic wall portion, and the valve body is arranged behind the valve seat and can be in close contact with the valve seat The valve bullet is accommodated in the refill behind the valve body, and the rear end of the valve bullet is locked to the inner wall of the ink containing portion behind the telescopic wall portion, The front end of the elastic body is in contact with the valve body and urges the valve body forward, an inner step is provided on the inner wall of the intermediate portion of the telescopic wall, and the valve elastic body is provided on the inner step. The valve body urged forward by is locked, the stretchable wall portion in front of the inner stepped portion is the first stretchable wall portion, The telescopic wall portion behind the side step portion is used as a second telescopic wall portion, an outer step portion is provided on the outer wall between the first telescopic wall portion and the second telescopic wall portion, and the inner wall of the shaft cylinder is provided. A contact wall portion is provided, and the contact wall portion and the outer stepped portion are in contact with each other in the protruding state of the pen tip, the first stretchable wall portion is extended, and the second stretchable wall portion is contracted. Thus, the valve body and the valve seat are separated from each other, the valve portion is opened, and the abutment wall portion and the outer stepped portion are separated from each other in the pen tip immersion state, and the first telescopic wall portion is 2. The retractable ballpoint pen according to claim 1, wherein the valve body and the valve seat are brought into close contact with each other and the valve portion is closed by the contraction and the extension of the second telescopic wall portion.

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