JPH0259079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a writing instrument whose tip portion is almost completely sealed when the writing portion of the writing member is placed in a stored state. The present invention can be applied to writing implements such as fountain pens, felt-tip pens, and ballpoint pens, but is particularly effective when applied to writing implements such as felt-tip pens.

A writing instrument that has a good seal when the writing part of the writing member is in the stored state, for example, has a storage part inside the tip of the shaft of the writing instrument, and when the writing member is in the stored state, the writing member is closed. The applicant of this application filed a patent application in 1973 for a device in which the writing part of the writing part is stored in the storage part.
No. 122932 (Unexamined Japanese Patent Publication No. 1983-49123), Utility Application No. 1983-
No. 11902 (Utility patent application No. 115279) and Utility patent application No. 11527-
An application has already been filed as No. 64915 (Utility Model Application No. 165688, 1988). However, all of these devices use a cam mechanism, but using a cam mechanism inevitably complicates the mechanism and increases production costs. Further, there are also drawbacks such as the tip of the writing instrument becoming ungainly and the writing member having to have a special shape.

SUMMARY OF THE INVENTION An object of the present invention is to provide, at a low cost, a writing instrument that has a good seal when the writing part of the writing member is placed in a stored state.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to drawings in which it is applied to a felt-tip pen having an air hole at its tip.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, and 1 is a sliding tube. A through hole 2 is provided at the center of the front end of the sliding tube 1, through which the writing part of the writing member enters and exits. The front part of the sliding tube 1 and the rear of the through hole 2 are located from the rear position of the through hole 2 to the lower side (hereinafter, the upper circumferential direction of the writing instrument is referred to as upper and the lower circumferential direction is referred to as lower in the drawing). ), a storage chamber 3 having an approximately elliptical shape is continuously opened in the through hole 2 as shown in the figure. The structure at this point is clearly shown in FIG. 2, which is a cross-sectional view taken from FIG. A cap-shaped seal cap 4 is fitted into the storage chamber 3 with the opening of the recess facing rearward. The seal cap 4 has an outer diameter that is slightly larger than the diameter of the through hole 2, and has a seal cap 4 which has an outer diameter that is slightly larger than the diameter of the through hole 2, and has a space between the axis of the writing instrument in the storage chamber 3 and the side part of the writing instrument as shown in FIGS. 1 and 2. It moves up and down to prevent it from slipping out of the storage chamber 3. In addition, an air chamber is provided in the seal cap 4 to allow air inside the writing member to flow back through an air hole provided near the tip of the writing part 9 of the writing member 8 (see FIG. 10 and FIG. 1
1, 13 and 14). Therefore, the writing part 9 and the air hole near the tip of the writing part are sealed in the recess of this air chamber. When the seal cap 4 is at the uppermost position, it comes to the rear position of the through hole 2 and blocks the through hole 2.
Moreover, when it is in the lowest position, it is out of the rear position of the through hole 2 and the through hole 2 is completely opened. Then, there is a seal cap 4 in the storage chamber 3.
After fitting, a disk-shaped partition member 5 is fitted from the rear inside the sliding tube 1 and is press-fitted while blocking the storage chamber 3 and fixed to the sliding tube 1. The inner diameter of the tip of the hole 6 of the partition member 5 is slightly smaller than the outer diameter of the seal cap 4 to prevent the seal cap 4 from slipping out to the rear. A hole 6 in the center of the partition member 5 is opened so that the writing part of the writing member can enter and exit. At the rear end portion of the sliding tube 1, two slits 7, 7 are formed facing each other in the axial direction from the rear.

A writing member 8 is housed inside the sliding tube 1, and a writing portion 9 is provided at the front end of the writing member 8. A recess 10 is provided from the rear at the center of the rear end of the writing member 8.

A cylindrical writing instrument main body 11 (hereinafter also simply referred to as the main body (11)), which is the gripping part of the writing instrument, is fitted on the outer periphery of the sliding tube 1. Inside the main body 11, slightly behind,
A disk 13 is attached via two opposing legs 12, 12. Then, the legs 12, 12 are attached to the sliding tube 1.
The structure at this point is shown in FIG. 3, which is a cross-sectional view of FIG. 1. A protrusion 14 is formed in the center of the front surface of the disc 13 and faces forward, and the writing member 8 is attached to the main body 11 by fitting the recess 10 of the writing member 8 into this protrusion 14. Another protrusion 15 is formed at the center of the rear surface of the disc 13 toward the rear.

A knock cap 16 is attached to the rear end of the sliding tube 1 from behind.
(Note that a reinforcing ring may be fitted to the inner surface of the rear end of the sliding tube 1 to reinforce the portion where the slits 7, 7 are provided.) And the main body 11
A spring S1 is fitted between the disc 13 and the lock cap ₁₆ to urge the sliding tube 1 and the like backward against the main body 11. A ring 17 is fitted around the inner periphery of the rear end of the main body 11, and the knock cap 16 is designed to move back and forth within the ring 17.

In Fig. 1, the seal cap 4 is connected to the sliding tube 1.
The writing member 8 is located at the axial center of the writing instrument at the rear of the through-hole 2 to close the through-hole 2, and the writing part 9 of the writing member 8 is shown to be stuck in the recess of the seal cap 4. This state is the storage state of the writing section 9, and when this writing instrument is not in use, it is kept in this storage state. The sealed state of the writing part 9 is maintained by a spring.
The seal cap 4 is held against the writing part 9 by the force of _S1 . When entering the writing state, first, as shown in Figure 4,
When you click the lock cap 16, the spring
While compressing S ₁ , the lock cap 16 and the sliding tube 1 move forward together with the seal cap 4, and when the seal cap 4 moves forward to the point where it is pushed by the partition material 5 and comes off the writing part 9 of the writing member 8, the seal cap 4 falls under its own weight from the axis of the writing instrument to the side of the writing instrument within the storage chamber 3, thereby unblocking the through hole 2 of the sliding tube 1. When you stop pressing the knob cap 16 at this point, the knob cap 16 and the sliding tube 1 move back due to the force of the spring _S1 , and the writing part 9 of the writing member 8 protrudes from the through hole 2 of the sliding tube 1, and the fifth The writing state will be as shown in the figure. Write in this writing state.

Next, when you want to put it in the working state, first flip it upside down so that the top of the main body 11 is now facing down and the bottom of the main body 11 is now facing up, resulting in the state shown in FIG. 6. When the knock cap 16 is clicked at this point, the sliding tube 1 moves forward and seals the seal cap 4.
When the seal cap 4 comes to a position in front of the writing section 9, the seal cap 4 falls within the storage chamber 3 and comes to a position where it closes the through hole 2 of the sliding tube 1, resulting in the state shown in FIG. When the push on the knob cap 16 is released, the sliding tube 1 retreats due to the force of the spring _S1 , and the seal cap 4 also retreats, causing the writing portion 9 of the writing member 8 to be covered with the writing portion 9 and the area near the writing tip. The air holes are sealed and the state shown in FIG. 8 is achieved.

Next, a second embodiment of the present invention will be explained with reference to FIG. While the storage chamber 3 of the first embodiment has a substantially oval shape, the storage chamber 3 of the second embodiment has a funnel shape. In this way, when the storage chamber 3 is turned upward, the seal cap 4 will fall to the rear position of the through hole 2 even if the position is not determined very accurately.

Next, a third embodiment of the present invention will be explained with reference to FIG. The storage chamber 3 of the third embodiment has a funnel shape when viewed in the front-rear direction. Similarly, this is a contrivance to make it easier for the seal cap 4 to fall to the rear position of the through hole 2.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 11 and 12. The storage chamber 3 of the fourth embodiment is elongated in the vertical direction, and the seal cap 4 has an oval cap-shaped support 18.
It is installed close to the upper end of the . A hole 19 having a size matching the through hole 2 is formed at the lower end of the support 18 . In this way, the seal cap 4
movement becomes smoother.

Next, a fifth embodiment of the present invention will be explained with reference to FIG. The storage chamber 3 of the fifth embodiment is formed to be inclined in the front-rear direction. By doing this, when you knock the writing instrument with its front end facing upward, the seal cap 4 will fall to the rear position of the through hole 2, and conversely, when you knock it with its front end facing downward, it will fall to the rear position of the through hole 2. come off from That is, the seal cap 4 can be moved by knocking the front end of the writing instrument downward or upward.

Next, a sixth embodiment of the present invention will be described with reference to FIG. 14. The storage chamber 3 of the sixth embodiment is the fifth embodiment.
The slope is opposite to that of the storage chamber 3 in the embodiment. The operation of the sixth embodiment is therefore opposite to that of the fifth embodiment.

Next, a seventh embodiment of the present invention will be described with reference to FIG. 15. The embodiments described so far have been of the lock type, but in the seventh embodiment, the writing member 8 can be put into the writing state or into the storage state by pulling and releasing the writing member 8 using both hands. I have to. That is, the connecting piece 20 is screwed and attached to the rear end of the writing member 8, and the connecting piece 2
The rear end of the cylindrical body 21 is fitted onto the outer periphery of the front end of the cylinder. The cylindrical body 21 is not very long, and a collar 22 is formed at its front end, and the collar 22 and the main body 1
A spring S 2 is fitted between the spring S ₂ and a stepped portion formed on the inner periphery near the rear end of the main body 11 to urge the cylindrical body 21 and the like forward with respect to the main body 11 . A protrusion 23 is formed on the outer periphery of the connecting piece 20, and a recess 24 is formed on the inner periphery near the rear end of the main body 11.
In the writing state in which the ridge 23 and the dent 24 are moved forward, the protrusion 23 wraps around the depression ₂₄ to support the pressure of the writing. 24 can also be omitted). Note that the base 25 is connected to the front of the main body 11 by screwing, and the structure formed at the front end portion of the sliding tube 1 in the first embodiment is replaced by the base 25.
is formed. Further, a cap-shaped outer cylinder 26 is attached to the rear end of the connecting piece 20. In this seventh embodiment, the main body 1 is
1 and grip the outer cylinder 26 with the other hand and pull the outer cylinder 26, the writing member 8 moves relatively backward and the seal cap 4 becomes movable. In addition,
In the first embodiment, the main body 11 and the writing member 8 are integrated, and the sliding tube 1 is movable relative to them, but in the seventh embodiment, the writing member 11 is relative to the main body 11. 8 is moved.

Next, an eighth embodiment of the present invention will be explained with reference to FIG. The eighth embodiment is a rotational version of the seventh embodiment. That is, in the seventh embodiment, a protrusion 27 is formed on the outer periphery of the main body 11, and a cam wall 28 made of large and small waveforms is formed on the inner periphery of the outer cylinder 26. Outer cylinder 2 with respect to main body 11
6, the protrusion 27 traces the cam surface of the cam wall 28 due to the force of the spring _S2 . When the protrusion 27 is at the bottom of a small wave on the cam surface, it is in a sealing state, and when it is at the bottom of a large wave, it is in a writing state.

Next, a ninth embodiment of the present invention will be described with reference to FIG. 17. A connecting piece 29 is screwed into the rear of the writing member 8, and the rear end of the main body 11 is screwed into the connecting piece 29. A cylindrical body 30 is fitted near the front end of the main body 11, and the cylindrical body 30 protrudes forward from the main body 11. A collar 31 is formed on the outer periphery of the rear end of the cylindrical body 30, and a spring _S3 is fitted between the flange 31 and a step formed on the inner periphery of the front end of the main body 11 to bias the cylindrical body 30 rearward. I'm letting you do it. A partition member 5 is attached to the front end of the cylindrical body 30, and a cap 25 is attached to the front of the partition member 5. A through hole 2 and a storage chamber 3 are provided in the cap 25, and a seal cap 4 is fitted inside the storage chamber 3.

FIG. 17 shows the storage state in which the seal cap 4 seals the writing part 9 of the writing member 8, but the cap 25, cylindrical body 30, etc. are urged backward by the force of the spring _S3 . , the seal cap 4 completely seals the writing portion 9 of the writing member 8. It should be noted that the operations for returning to the writing state and the operations for returning to the storage state are clear from the above description, and will therefore not be described here. In this ninth embodiment, the writing state or the sealing state is achieved by moving the cap 25 forward or backward. In addition,
If a cap is integrally provided on the outer periphery of the cap 25 and the rear end of the cap slides over the front part of the main body 11, the cylindrical body 30 is not visible from the outside during sealing, so that the appearance is improved. However, in this case, when you write while holding the cap, the pressure of the writing is supported by the spring _S3 , so if the cap and main body 11 are provided with protrusions and depressions, respectively, as in the seventh embodiment, good.

Next, a tenth embodiment of the present invention will be explained with reference to FIGS. 18 to 22. The main body of the tenth embodiment consists of a front shaft 32 and a rear shaft 33 connected to the rear of the front shaft 32 by screwing. A sliding tube 1 is fitted inside the main body, and a writing member 8 is fitted inside the sliding tube 1. A cylindrical knob member 34 is connected to the rear of the sliding tube 1, and two slits 35, 3 are provided at the front of the knob member 34 to face each other.
5 is opened in the axial direction. As in the first embodiment, a protrusion 14 formed at the front of the disc 13
The rear end of the writing member 8 is screwed in, and the two legs 12, 12 formed on the outer periphery of the disc 13 are passed through the slits 35, 35 of the knob member 34, respectively. It has a structure in which a ring-shaped part is integrally formed on the outer periphery of the legs 12, 12, and the ring-shaped part is sandwiched between a front shaft 32 and a rear shaft 33. A rear end ring 36 is screwed into the inner periphery of the rear end of the rear shaft 33 to prevent the knob member 34 and the like from slipping out rearward. A spring S4 is fitted between the disk 13 and the knob member ₃₄ to bias the knob member 34 and the like rearward.

The tip of the sliding tube 1 is shaped like a cone, and a partition material 5 is fitted into the tip from the rear.
A conical storage chamber 3 is located further forward. There is also a conical seal cap 4 inside the storage chamber 3.
However, in the sealed state shown in FIG. 18, the seal cap 4 is sealed against the writing portion 9 of the writing member 8. seal cap 4
An O-ring 37 is fitted inside to complete the seal. Further, an air chamber (indentation) is provided in the seal cap 4 through which air flows back through the writing part tip hole 39. The tip portion of the seal cap 4 protrudes from the tip opening of the sliding tube 1.

To go from the sealed state to the writing state, first, with the writing instrument in a horizontal or nearly horizontal state, knock the knock member 34, and the sliding tube 1 will move forward.
The seal cap 4 remains in the writing part 9 of the writing member 8, and the rear end of the seal cap 4 is in the state shown in FIG. 19 in contact with the partition material 5.
When the sliding tube 1 moves further forward, the seal cap 4
falls out of the writing section 9 and is deposited in the lower part of the storage chamber 3, as shown in FIG. At this time, the seal cap 4 is completely out of the front position of the writing member 8, so if you stop locking the knob member 34 at this point, the knob member 34 and the sliding tube 1 will move back due to the force of the spring _S4 , allowing you to write. The portion 9 protrudes from the tip of the sliding tube 1, resulting in the writing state shown in FIG. 21. To return from the writing state to the sealed state, point the tip of the writing instrument downward and knock the knock member 34. When the sliding tube 1 moves forward and the writing part 9 reaches a position where it does not obstruct the forward movement of the seal cap 4, The seal cap 4 slides down the conical wall of the storage chamber 3,
The tip thereof protrudes from the tip opening of the sliding tube 1 and the second
The state shown in Figure 2 will be obtained. At this point, when the knocking of the knocking member 34 is stopped, the sliding tube 1 and the seal cap 4 retreat, and the seal cap 4 is placed in the writing portion 9 of the writing member 8, returning to the state shown in FIG. 18.

The features of the tenth embodiment are as follows. When changing from the sealed state to the writing state, the writing instrument should be held horizontally or nearly horizontally and the knob member 34
There is no need to distinguish between the upper and lower parts of the writing instrument. On the other hand, when changing from the writing state to the sealed state, it is only necessary to knock the knocking member 34 while pointing the tip of the writing instrument downward, which is extremely convenient compared to the embodiment shown above. Moreover, it is easy to make the tip of the writing instrument into a sharp shape, and therefore there is no need to make the thin part of the writing member 8, which corresponds to the neck, particularly long.

Next, an eleventh embodiment of the present invention will be explained with reference to FIG. 23. The eleventh embodiment is the tenth embodiment in which the storage chamber 3 is slightly modified. FIG. 23 is a partially cutaway perspective view of the tip of the sliding tube 1. At the same time as the storage chamber 3 is made conical, several guide grooves 38 are cut out in an arc shape on the inner surface of the tip of the sliding tube 1. or is forming. The guide groove 38 is deep at the rear and becomes shallower toward the front. In the writing state, the seal cap 4 fits snugly into one of the guide grooves 38, and the writing instrument is held in the sealed state. When the sliding tube 1 is moved forward with the tip facing down,
The seal cap 4 is guided by the guide groove 38 and protrudes from the opening at the tip of the sliding tube 1.

Next, a twelfth embodiment and a thirteenth embodiment of the present invention will be explained with reference to FIGS. 24 and 25. The shape of the seal cap 4 and the structure of the tip of the sliding tube 1 may be as shown in FIGS. 24 and 25.

In the embodiment shown above, if the part where the seal cap 4 is provided is made transparent, it is possible to check the movement of the seal cap 4 and whether or not the writing part 9 is firmly attached to the seal cap 4.
It is convenient because you can see it from the outside. Also, in the sealed state, the tip of the seal cap 4 is connected to the through hole 2.
If the seal cap 4 is made to protrude more, the seal cap 4 may be colored to make it more noticeable when the seal is being sealed.

As is clear from the above, in the writing instrument according to the present invention, the seal cap 4 stored in the storage chamber 3 comes to the position of the through hole 2 due to its own weight and seals the writing part 9 of the writing member 8. Alternatively, the writing part 9 is allowed to move forward by moving out of the position of the through hole 2 due to its own weight, and is made to protrude from the through hole 2 to enter the writing state. It is extremely convenient because the sealed state or the writing state can be set simply by moving the writing member 8 forward or backward relative to each other. In addition, since the air hole is provided near the tip of the writing part and the air hole and the writing part are fitted into the small capacity recess of the seal cap 4 and sealed, the writing liquid of the writing instrument is removed from the air hole and the writing part. It is preferable because the amount of evaporation is small. Furthermore,
Since the structure is simple, it can be manufactured at low cost. The shape of the writing instrument as a whole and the writing member 8 does not need to be unique.

[Brief explanation of drawings]

1, 4, 5, 6, 7 and 8 are longitudinal cross-sectional views for explaining the operation of the first embodiment of the present invention, and FIGS. 2 and 3 are respectively 1 - sectional view and - sectional view, No. 9
10, 11, 13, and 14 show the main parts of the second embodiment, third embodiment, fourth embodiment, fifth embodiment, and sixth embodiment of the present invention, respectively. The sectional view shown in Figure 12 is XII of Figure 11.
-XII sectional view, FIG. 15, FIG. 17, and FIG. 18 are longitudinal sectional views showing the seventh embodiment, ninth embodiment, and tenth embodiment of this invention, respectively, and FIG. Developed view of main parts of embodiment, No. 19
20, 21, and 22 are longitudinal cross-sectional views of essential parts, respectively, for explaining the operation of the tenth embodiment, and FIG. 23 is a partial cross-sectional perspective view of the essential parts of the eleventh embodiment of the present invention. 24 and 25 are cross-sectional views of essential parts of the twelfth and thirteenth embodiments of the present invention, respectively. 1: Sliding tube, 2: Through hole, 3: Storage chamber, 4: Seal cap, 5 : partition material, 8: writing member,
9: writing part, 11: writing instrument body, 25: cap.

Claims (1)

[Scope of Claims] 1. The writing member 8 is housed in the cylindrical sliding tube 1 or the writing instrument body 11 so that at least the tip of the writing instrument at the tip of the sliding tube 1 or the writing instrument body 11 and the writing member 8 are The sliding tube 1 or the writing instrument main body 11 is formed so as to be relatively movable forward or backward, and the sliding tube 1 or the writing instrument main body 11 is pressed and biased rearward with respect to the writing member 8 by a spring, and the tip of the writing instrument has a A through hole 2 is opened so that the writing part 9 at the tip of the writing member 8 can protrude,
A storage chamber 3 for movably storing the seal cap 4 is provided in the through-hole 2 and has a recess of a small capacity that allows the air inside the writing member 8 to circulate through an air hole provided near the tip of the writing part 9. A partition member 5 is provided at the rear side to be continuous with the through hole 2, and at the rear of the storage chamber 3, an opening for entering and exiting a writing member is provided in the center.
The seal cap 4 is stored in the storage chamber 3 so as to be movable under its own weight between the writing instrument shaft center and the side parts of the writing instrument on its side, and the writing member 8 is placed against the tip of the writing instrument. When the writing part 9 is moved backwards against the spring to the rear of the partition member 5, the seal cap 4 is moved freely by its own weight to the writing instrument shaft center of the storage chamber 3, and the recess of the seal cap 4 is used to write. The seal cap 4 is formed so that it can be pushed elastically into the portion 9 via a spring and fitted, or the seal cap 4 is movable by its own weight to the side portion of the writing instrument in the storage chamber 3, and the writing portion 9 is inserted through the storage chamber 3. A writing instrument characterized by being formed so as to be able to protrude freely from a through hole 2 at the tip of the writing instrument.