JPH0423640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a writing portion of a writing member that effectively seals the writing portion when the writing portion is placed in a stored state. This invention can be applied to the writing parts of fountain pens, felt-tip pens, ball-point pens, etc., but especially when applied to writing instruments such as felt-tip pens and water-based ball-point pens, the volatile components in the ink evaporate to a small extent, making it impossible to write or when writing. It has the greatest effect in reducing blurring.

The applicant of this application accommodates a sliding cylinder in a main body so that it can move forward and backward, houses a sealing cylinder in the sliding cylinder, and swings around a point near the front end of the sealing cylinder as a fulcrum. Various applications have already been filed for writing instruments that are provided with a seal body that opens and closes the front end opening of the seal tube, and that accommodates a writing member within the seal tube so that it can be moved forward and backward (Utility Application No. 133783-1983). No., Special Application No. 57-233143, Jitsuganaki
No. 58-32280, patent application No. 58-81798). by the way,
When replacing these writing parts,
After removing the sliding tube and seal tube, replacing the writing member and reattaching the seal tube and sliding tube,
It required cumbersome operations. Furthermore, when the sliding tube is removed, the seal body is exposed near the front end of the seal tube, giving an unsightly impression, and when the user removes the seal tube, the seal body may be torn off or the seal body may be damaged. There was also a risk that the seal body could be damaged due to mischief. In addition, when covering the seal tube with the sliding tube from the front, it was necessary to take care to place the seal body in the specified position so as not to damage the seal body or cause the sliding tube to get caught on the seal body. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a writing instrument of this type in which the writing member can be easily replaced and the seal body at the front end of the seal cylinder is not exposed when the writing member is replaced.

Next, embodiments of the invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, and 1 is a front shaft. A sliding tube 2 is fitted inside the front shaft 1 from the front. The front end of the sliding tube 2 is formed into a tapered shape, and the front end is opened to form a front end opening 3.
It is said that Two slits 4, 4 are provided in the rear half of the sliding tube 2 in the axial direction from the rear.

A separate seal cylinder 5 is prepared. The front end portion of the seal cylinder 5 is a small diameter portion 6, and a front end opening 7 is formed at the front end of the small diameter portion 6. Two protrusions 8, 8 are provided at the rear end of the seal cylinder 5 facing outward. Then, while bringing those protrusions 8, 8 out of the sliding tube 2 through the slits 4, 4 of the sliding tube 2, fit the seal tube 5 inside the sliding tube 2, and insert the protrusions 8, 8 at the front end of the front shaft 1. It is press-fitted into the nearby inner surface and fixed.

A separate seal body 9 as shown in FIG. 2 is prepared, and the seal body 9 is made of an elastic material such as rubber. The seal body 9 has a structure in which a rear end of a tongue piece 11 bent into an L-shape is attached to one side of a ring-shaped attachment part 10, and a seal piece 12 is formed at the front end of the tongue piece 11. The upper surface of the seal piece 12 is hemispherical, and the lower surface is flat. and,
The attachment part 10 is fitted from the front of the small diameter part 6 of the seal cylinder 5, and is mounted against the stepped part of the small diameter part 6. The attachment portion 10 may be bonded or may simply be fitted into the small diameter portion 6 without bonding.

A retaining ring 13 is press-fitted and fixed on the inner surface near the rear end of the seal cylinder 5, a seal ring 14 is similarly press-fitted from behind the retaining ring 13, and another retaining ring 13 is press-fitted and fixed from behind. The seal ring 14 is made of an elastic material such as rubber, and has inward protrusions formed at its front end and rear end, respectively.

While applying the front end to the rear retaining ring 13 press-fitted into the rear end of the seal cylinder 5 and fixed, slide the sliding cylinder 2.
A spring 15 is fitted in the rear half of the spring 15. Then, a receiving ring 16 is press-fitted and fixed to the inner periphery of the rear end of the sliding tube 2, and the rear end of the spring 15 is received by the receiving ring 16.

The writing member 17 is fitted from the rear inside the seal tube 5 and the sliding tube 2, and the front part of the writing member 17 is provided with an air hole 18, and furthermore, the front part of the writing member 17 is made into a small diameter part 19. A writing section 20 is formed at the front end of the section 19. And writing member 17
The rod 21 is connected to the rear of the writing member 17 by screwing the rear end into a large diameter portion formed at the front end of the rod 21.

Although a separate cam cylinder 22 is prepared, the cam cylinder 2
Two protrusions 23, 23 are formed in front of the protrusion 2 facing outward. A cam wall 24 is formed on the inner peripheral surface of the cam cylinder 22. The cam wall 24 is provided with an axial groove and an inclined locking edge at the front end. The rear end of the cam cylinder 22 is slightly constricted inward to form a stepped portion 25.

The push rod 26 is fitted into the cam cylinder 22 from the front, and the push rod 26 is pipe-shaped, and the front end is slightly enlarged so that the enlarged portion hits the stepped portion 25 of the cam cylinder 22. This prevents the push rod 26 from slipping out rearward. Then, several protrusions are formed in the enlarged part, and these protrusions form the cam wall 24 of the cam cylinder 22.
It is fitted in the groove. An inclined surface is formed at the front end of the push rod 26, and most of the push rod 26 projects rearward from the rear end opening of the cam cylinder 22.

The rear part of the rotary cam 27 is fitted inside near the front end of the push rod 26, and the rotary cam 2 is placed in front of the push rod 26.
7 is placed. Several protrusions are formed on the outer periphery of the rotating cam 27, and these protrusions are fitted into grooves in the cam wall 24 of the cam cylinder 22. The rear surface of the rotary cam 27 is formed with an inclined surface.

A spring 28 is fitted to the outer periphery of the rod 21 within the cam cylinder 22, and a receiving ring 29 is fitted and fixed to the front end of the cam cylinder 22 while pushing the front end of the spring 28. The rear end of the spring 28 is received by a ring fitted to the rear end of the rod 21.

A separate cylindrical body 30 is prepared, and the cylindrical body 30 has two slits 31, 31 in the axial direction from the rear.
is open. and the protrusion 23 of the cam cylinder 22,
23 into the slits 31, 31,
A cylindrical body 30 is fitted onto the outer periphery of the cam cylinder 22 from the front. At this time, the front end of the cylindrical body 30 is in contact with the receiving ring 16 fitted to the rear end of the sliding tube 2. Then, the protrusions 23, 23 of the cam cylinder 22,
After the separate rear shaft 32 is press-fitted into the inner surface of the rear shaft 32 from the front and fixed, the rear shaft 32 is screwed into the rear of the front shaft 1 to connect the front shaft 1 and the rear shaft 32. At this time, the rear portion of the cylindrical body 30 protrudes rearward from the rear end opening of the rear shaft 32, and a knob gap 33 is fitted into the protruding portion from the rear.

Although Fig. 1 shows the sealed state, the sliding tube 2
is the retaining ring 1 press-fitted and fixed to the rear end of the seal cylinder 5.
3 and the receiving ring 16, the hemispherical upper surface of the seal piece 12 of the seal body 9 attached to the front end of the seal cylinder 5 , the sliding tube 2 is prevented from retreating while being pressed against the inclined surface of the inner surface of the front end of the sliding tube 2, so that the seal piece 12 completely seals the front end opening 7 of the seal tube 5. There is. Even in the rear position, a seal ring 14 is attached to the inner surface near the rear end of the seal cylinder 5 and is sandwiched between the retaining rings 13, 13 so that it cannot move back and forth, sealing the space between it and the writing member 17. Therefore, the writing portion 20 and air hole 18 of the writing member 17 are completely sealed. At this time, the push rod 26 moves backward until the enlarged part near the front end touches the stepped part 25 of the cam cylinder 22, and protrudes rearward from the rear of the cam cylinder 22, and the rotating cam 2
7 is also retreated rearward within the cam wall 24 of the cam cylinder 22.

To change from the sealed state to the writing state, the knock gap 33 is clicked. When the knock gap 33 is knocked, the spring 15 is compressed and the sliding tube 2 is moved forward via the cylindrical body 30 and the receiving ring 16. After the knock gap 33 hits the rear end of the push rod 26, the spring 15 and the spring 15 are pushed forward. While also compressing 28, press the push rod 26,
Writing member 17 via rotary cam 27 and rod 21
3, and the state shown in FIG. 3 is reached. At this time, there is a gap between the inner surface of the front end of the sliding tube 2 and the front end of the seal tube 5, and the seal body 9 extends forward by its own elasticity to open the front end opening 7 of the seal tube 5.
is opened.

After that, if the knocking is continued, the small diameter portion 19 of the writing member 17 will be inserted into the front end opening 7 of the seal tube 5.
It is in the state shown in FIG. 4, where it protrudes from. In addition,
During the process from the state shown in FIG. 1 to the state shown in FIG. 3 and then to the state shown in FIG. 4, the writing portion 20 of the writing member 17 does not come into contact with the seal body 9. In the state shown in FIG. 4, the rotary cam 27 is in a position slightly advanced from the front edge of the cam wall 24.

Here, when the push of the knob gap 33 is released, the sliding tube 2 etc. are pushed back by the spring 15, but the writing member 17 is pushed back by the spring 28 and rotates a little while moving back. Since it is prevented from retreating by being locked to the front edge of the wall 24, the front end portion of the writing member 17 protrudes from the front end opening 3 of the sliding tube 2, resulting in the writing state shown in FIG. 5. At this time, the inner surface of the front end of the sliding tube 2 comes into contact with the front end of the seal tube 5, and the sliding tube 2 and the like are prevented from retreating. Continue writing in this state. In the writing state, the writing pressure applied to the writing member 17 is applied to the rod 21, the rotating cam 27, and the cam cylinder 2.
The main body is supported through 2.

Conversely, to change from the writing state to the sealing state, the knock gap 33 is tapped in the state shown in FIG.
As the knob gap 33 moves forward, the push rod 26
When the rotating cam 27 reaches the state shown in FIG. 4, in which it is slightly advanced from the front edge of the cam wall 24, the push on the knock gap 33 is released, and the rotating cam 27 rotates a little and then moves forward. The cam wall 24 is pushed by the spring 28.
The writing member 17 and the rod 21 also move back, but when the step near the front end of the rod 21 hits the receiving ring 29, the writing member 17 and the rod 21 are prevented from moving back. At this time, the writing member 17 is completely housed inside the seal tube 5, the sliding tube 2, and the main body.

The forward and backward mechanism using the rotary cam, pusher, and cam cylinder described above is a well-known mechanism that is widely used as a forward and backward mechanism for knob-type writing instruments.

On the other hand, the sliding tube 2 is pushed back by the spring 15, but at this time, the seal piece 12 of the seal body 9 attached near the front end of the seal tube 5 slides due to the hemispherical surface on its upper surface. The front end opening 7 of the seal cylinder 5 slides along the inclined surface of the inner surface of the front end of the cylinder 2.
, and finally comes to the front position of the front end opening 7. When the sliding tube 2 continues to retreat, the inner surface of the front end of the sliding tube 2 presses the seal piece 12 against the front end of the seal tube 5 to close the front end opening 7, returning to the sealed state shown in FIG. 1.

In order to replace the writing member 17 in the above-mentioned device, the following procedure is performed. When the front shaft 1 is rotated and removed from the rear shaft 32, the sliding cylinder 2 and the seal cylinder 5 remain stuck in the front shaft 1, and the writing member 17 is exposed in front of the rear shaft 32. Here, writing member 1
7 is removed from the rod 21, and the rear end of a new writing member 17 is screwed into the front end of the rod 21 in its place. There is a sliding tube 2 and a seal tube 5 inside.
The front shaft 1 is placed over the writing member 17 from the front and screwed onto the front end of the rear shaft 23. The seal body 9 is not exposed when the writing member 17 is replaced.

Although one embodiment of the present invention has been shown above, the embodiment of the present invention is not limited to the above embodiment. For example, as the sliding tube 2, the slit 4,
4 is shown as a long one, but it may be short enough to cover the front part of the seal cylinder 5 and can be linked with the rear knob member by using a connecting pipe. The number of slits in the sliding tube 2 may be three, which is the same number as the protrusions 8 at the rear end of the sealing tube 5.

Although a knob gap 33 is shown as the knob member, the shape, structure, etc. of the knob member may be arbitrary. It may be of a so-called cap-knock type that is placed over the rear shaft 32 from behind.

The shape, structure, etc. of the seal body 9 are also arbitrary. Although the seal body 9 is shown to be made of an elastic material, the material of the seal body 9 is arbitrary. A sealing material made of an elastic material may be attached to the back surface of the sealing piece 12 to seal between it and the front end of the sealing cylinder 5. An elastic material may be placed at the front end of the seal tube 5, or the seal tube 5 itself may be made of an elastic material.
As the seal piece 12 is divided into two or more pieces,
The seal piece 12 is opened in a double-door shape, etc., and the seal cylinder 5 is opened.
The front end opening 7 may be opened.
The seal body 9 is shown in which a tongue piece 11 is interposed between the attachment part 10 and the seal piece 12, but if there is a tongue piece 11, the tip of the tongue piece 11 will be removed when changing from the writing state to the sealing state. The seal piece 12 located at is well guided by the inclined surface on the inner surface of the front end of the sliding tube 2
It is guided to a position in front of the front end opening 7 of the seal cylinder 5. However, the tongue piece 11 is not necessarily necessary. Further, when the tongue piece 11 is provided, its length may be arbitrary.

The attachment means and attachment location of the seal body 9 are also arbitrary. Although the seal body 9 is shown attached to the front end of the seal tube 5, the seal body 9 may be attached to the sliding tube 2 side. In any case, while swinging about one point, the seal piece 12 moves toward the front end opening 7 of the seal cylinder 5.
It may be installed so that it can be opened and closed. Although the seal piece 12 is shown as being attached so as to swing in the front-rear direction, it may be attached so as to swing in the left-right direction or the like.

The front end opening 7 of the seal cylinder 5 serves as the seal body 9.
Although an example is shown in which the front end opening 7 is biased in the direction of opening, it may be biased in the direction of closing the front end opening 7, or it may not be biased at all.
When biased in the closing direction or when no bias is applied, the front end of the writing member 17 moves forward while repelling the seal piece 12 when changing from the sealed state to the writing state, so the seal A groove or the like into which the front end of the writing member 17 fits is provided on the rear surface of the piece 12, and when the writing member 17 moves forward, the writing portion 20 at the front end of the writing member 17 fits into the groove or the like, causing the front end of the writing member 17 to tilt. The writing part 20 may be devised so that it moves forward while repelling the seal piece 12 with the writing part 20 so that the writing part 20 does not come into contact with the seal piece 12. If the writing part 20 can come into contact with the seal piece 12, such a device is not necessary.

When biasing the seal body 9, in addition to using its own elasticity, it is also possible to use a spring, a magnet, or the like. Some or all of the sliding tube 2, seal tube 5, seal piece 12, etc. are made of magnets or magnetic materials, and when the sliding tube 2 moves forward, the seal piece 12 is attracted by magnetic force and swung forward. It is also possible to open the front end opening 7 of the seal cylinder 5 by moving the seal cylinder 5.

Although the sealing at the rear position is performed by the seal ring 14 attached to the inner surface of the seal cylinder 5, the seal ring 14 may be cylindrical with a protrusion on the center inner surface, or may be an O-ring. It may be made into a shape, and its shape and structure are arbitrary. Alternatively, it may be attached to the writing member 17 side. The seal cylinder 5 may be made of an elastic material and a protrusion may be formed on the inner surface of the seal cylinder 5. In any case, the sealing means in the rear position are also optional.

Although a gap is shown between the rear end of the push rod 26 and the knock cap 33 in the sealed state, this gap may not be left.

The present invention has the following excellent effects.

In the writing instrument according to the present invention, the knock member is clicked to change from the sealed state to the writing state. When the knocking member is clicked, the sliding tube 2 moves forward, releasing the pressure on the sealing body 9 that has blocked and sealed the front end opening 7 of the sealing tube 5. For this reason, the seal body 9 is in a state where it can swing about one point, allowing the writing member 17 to move forward. At this time, the front end of the writing member 17 that has been advanced by the notch of the knocking member protrudes from the opening 7 of the seal tube 5, and the writing member 17 is locked in the forward position as it is, and then when the sliding tube 2 retreats, the writing portion 20 protrudes from the front end of the sliding tube 2 to be in a writing state.

Next, when the knocking member is clicked, the writing member 17, which has been locked in the forward position, is released from the lock, and the writing member 17 is in a retractable state, and is moved back by the spring 28 and the seal cylinder 5
stored inside. Subsequently, when the sliding tube 2 is pushed back by the spring 15, the inner surface of the front end of the sliding tube 2 presses the seal body 9 against the front end of the seal tube 5, closing the front end opening 7 and sealing it. Furthermore, since sealing means for sealing between the writing member 17 and the seal tube 5 is provided even at the rear position, the writing portion 20 of the writing member 17 and the air hole 18 are completely sealed by these sealing means. state.

The operation is really simple, as all you have to do is click the knob member to change it to the writing state or the sealing state. The sealing in the sealed state is performed automatically and completely. Moreover, since the space in the sealed area is reduced, volatile components in the ink are less likely to volatilize, which reduces the possibility of writing becoming impossible or blurring when writing.

The writing member 17 is replaced as follows. If the front shaft 1 is removed, the sliding tube 2 and seal tube 5 will also come off together with the front shaft 1, and the writing member 17 will be exposed with its rear end held on the rear shaft 32 side, so the writing member 17 was replaced in that state. After that, cover the front axle 1 side again and integrate it with the rear axle 32 side. In other words, replacement is easy because it is only necessary to remove the front shaft 1 side, replace the writing member 17, and reattach the front shaft 1 side. Moreover, since the seal body 9 is always inside the sliding tube 2 and not exposed during replacement, there is no risk of the seal body 9 being exposed and causing unsightly appearance or damage to the seal body 9.

[Brief explanation of drawings]

1, 3, 4, and 5 are sectional views showing the operation of one embodiment of the present invention, and FIG. 2 is a perspective view showing the main parts of the embodiment. 1...Front shaft, 2...Sliding tube, 3...Front end opening, 5...Seal tube, 7...Front end opening, 9...
Seal body, 14... Seal ring, 15... Spring, 17... Writing member, 20... Writing portion, 2
1... Rod, 22... Cam cylinder, 24... Cam wall, 26... Push rod, 27... Rotating cam, 28...
...spring, 32...rear shaft, 33...notch cap.

Claims (1)

[Claims] 1 Inside the main body composed of the front shaft 1 and the rear shaft 32,
A sliding tube 2 having a front end opening 3 formed at the front end is accommodated so that it can move forward and backward, and the sliding tube 2 is biased backward by a spring 15. A knob member is provided at the rear of the sliding tube 2. Connecting the knob member to the rear shaft 3
2 so that it can be clicked from the outside, and inside the sliding tube 2 there is a front end opening 7 at the front end and a projection 8 at the rear end.
The seal cylinder 5 is fixedly attached to the front shaft 1 side by the protrusion 8, and the front shaft 1,
The sliding tube 2 and the sealing tube 5 are constructed so that they cannot be separated, and the writing member 17, which has a writing portion 20 formed at its tip, can move forward and backward within the sealing tube 5, and is urged rearward by a spring 28. A cylindrical body 3 that is held on a shaft 32 and that compresses the spring 15 to advance the sliding cylinder 2 when the knocking member is knocked between the writing member 17 and the knocking member.
0, and a cam cylinder 22, a push rod 26, and a rotary cam 27 for compressing the spring 28 to advance the writing member 17 and lock it at the forward position, and a A writing instrument that is provided with a seal body 9 that opens and closes a front end opening 7 while swinging about a point, and a sealing means that seals between the seal cylinder 5 side and the writing member 17 side at a rear position.