JPH0337519B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a writing instrument that effectively seals the writing portion of a writing member when the writing portion 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 most effective when applied to writing implements such as felt-tip pens and water-based ballpoint pens.

The applicant of this application puts the writing portion of the writing member into the sealed state or into the writing state by knocking or rotating the seal cap, seal bulb, etc., into or out of the sealing position. Various applications have already been filed for devices that can be used to
No. 102238 (Unexamined Japanese Patent Publication No. 58-5299), Patent Application No. 1983-
No. 137779 (Japanese Unexamined Patent Publication No. 1983-39499), Utility Application No. 1983-
No. 167109 (Utility patent application No. 72089), Utility patent application No. 1987-
No. 167110 (Utility patent application No. 72088), Utility patent application No. 1987-
No. 52578 (Utility patent application No. 155278), Utility patent application No. 155278-
No. 55014 (Utility patent application No. 157682), Utility patent application No. 157682
No. 133784 (Utility Model No. 59-38084)). By the way, since these devices seal near the tip of the writing member, the air hole must be provided near the tip of the writing member. The drawback was that it was not possible to use a slightly modified version of the original, and a special writing member had to be manufactured.

An object of the present invention is to provide a writing implement of this kind that can utilize writing members that are generally sold.

Next, the configuration of the present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view showing a first embodiment of the invention. 1 is a cylindrical shaft tube. Shaft tube 1
A pair of legs 2, 2 are formed at two opposing positions toward the center at the rear end. The inner ends of the legs 2, 2 are attached to the outer periphery of the cylindrical body 3 near its front end.
The rear end of the cylindrical body 3 is slightly constricted inward to form a stepped portion 4. A cam wall 5 is formed on the inner peripheral surface of the cylindrical body 3. The cam wall 5 is provided with an axial groove and an inclined locking edge at the front end. Although the shaft tube 1, legs 2, 2, and cylindrical body 3 shown above are integrally molded, they may be molded separately and assembled by adhesion or the like.

A cylindrical push rod 6 is fitted inside the cylindrical body 3. The front end of the push rod 6 is slightly enlarged, and the enlarged portion hits the stepped portion 4 of the cylindrical body 3, so that the push rod 6 is expanded. prevents it from slipping out backwards. A number of protrusions are formed on the enlarged portion, and these protrusions are fitted into grooves in the cam wall 5 of the cylindrical body 3. An inclined surface is formed at the front end of the push rod 6, and most of the push rod 6 protrudes rearward from the rear end opening of the cylindrical body 3. A rotary cam 7 is disposed in front of the push rod 6, and a number of protrusions are formed on the outer periphery of the rotary cam 7, and these protrusions are fitted into grooves in the cam wall 5. Rotating cam 7
An inclined surface is formed on the rear surface. A hole is provided in the center of the rotary cam 7, and the rod 8 is connected to the front of the rotary cam 7 by fitting the rear portion of the rod 8 into the hole. These cam walls 5 and rotary cam 7 constitute a holding means for holding a writing member 10, which will be described later, in the forward position. A bushing 9 is attached to the inner periphery near the front end of the cylindrical body 3, and a spring S ₁ is installed between the bushing 9 and the rear end collar of the rod 8.
is fitted to urge Rod 8 etc. backwards.
This spring _S1 constitutes a second biasing means.

A separate writing member 10 is prepared. Furthermore, a connecting member 11 is prepared, and the first half of the connecting member 11 has a cylindrical shape with a large diameter, and the second half has a cylindrical shape with a small diameter. The writing member 10 is connected to the front of the rod 8 by detachably fitting the outer periphery of the rear end portion of the writing member 10 into the front half portion and fixing the rear end portion to the outer periphery of the front end portion of the rod 8. An air hole 12 is provided in the front part of the writing member 10.
Further, the front portion of the writing member 10 is a small diameter portion 13, and a writing portion 14 is formed at the front end of the small diameter portion 13. A packing 15 is provided on the front end surface of the bushing 9 and has a size such that its outer periphery comes into elastic pressure contact with the inner periphery of an inner cylinder 16, which will be described later. This packing 15 constitutes a second seal member.

A cylindrical inner cylinder 16 is prepared, but the inner cylinder 16
The rear end is removably fitted into the front part of the cylindrical body 3. The vicinity of the front end of the cylinder 16 is a small diameter portion 17, and the tip of the small diameter portion 17 is a tip opening 18. As shown in FIG. 2, which is an enlarged exploded perspective view, a pair of protrusions 19, 19 are formed near the tip of the small diameter portion 17, and the protrusions 19, 19 have small holes 20, 20, respectively.
is open. A separate seal body 21 constituting the first seal member is prepared, and the seal body 21 is approximately disk-shaped and has a size that closes the tip opening 18 of the inner cylinder 16. The front surface of the seal body 21 is formed into a curved surface, and the seal material 22 is laminated on the rear surface. A pair of protrusions 23, 23 are also formed on the seal body 21, and small holes 24, 24 are formed in the protrusions 23, 23, respectively. A spring 25 is fitted between the protruding pieces 19 of the inner cylinder 16, and the protruding piece 1
9, 19 between the protrusions 23, 23 of the seal body 21, one pin 26 is inserted between the protrusions 19, 19, 2.
When the seal body 21 is attached near the tip of the inner cylinder 16 by passing it through the small holes 20, 20, 24, 24 of No. 3, 23 and the spring 25, the state shown in FIG. 3 is obtained. At this time, the spring 25 applies a force in a direction to slightly open the seal body 21. When the seal body 21 is rotated in the vertical direction, the seal material 22 closes and seals the tip opening 18 of the inner cylinder 16.

Similarly, a cylindrical sliding tube 27 is prepared,
Slits 28, 28 are cut from the rear at two opposing positions in the rear part of the sliding tube 27, and the sliding tube 27 is fitted between the shaft tube 1 and the inner tube 16, and the legs 2, 2 are attached. The rear portion of the sliding tube 27 is made to protrude rearward from the rear end opening of the shaft tube 1 while passing through the slits 28, 28. Then, a spring _S2 is fitted between the sliding tube 27 and the cylinder 3, its front end is brought into contact with the legs 2, 2, and a lock cap 29 is fitted to the rear end of the sliding tube 27 to lock the spring _S2 . . Sprink S ₂
serves to bias the sliding tube 27 rearward, and constitutes a first biasing member. When the cap 30 is screwed and attached to the front end of the sliding tube 27, the structure shown in FIG. 1 is completed. The cap 30 is formed into a tapered shape, with a tip opening 31 formed at the tip and an inclined surface 32 on the inner surface.
is formed.

Although FIG. 1 shows the sealed state, the sliding tube 27 is pushed back by the spring S ₂ and the inclined surface 32 on the inner surface of the cap 30 is pushing the seal body 21 backward, so that the sealing material 22 closes and seals the tip opening 18 of the inner cylinder 16. and,
Since the packing 15 seals between the rear portion of the inner cylinder 16 and the rear end of the writing member 10, both the writing portion 14 and the air hole 12 of the writing member 10 are in a sealed state. Note that at this time, the push rod 6 is retreating rearward, and the rotary cam 7 is also retreating rearward within the cam wall 5.

To change from the sealed state to the writing state, the knock cap 29 can be knocked. When the knock cap 29 is clicked, the sliding tube 27 and the cap 30 move forward while compressing the spring _S2 .
When the cap 30 moves forward, the seal body 21, which is released from the push from the front, rotates forward by the force of the spring 25 and opens the tip opening 18 of the inner cylinder 16.

When the knock cap 29 is knocked, the writing member 10 is simultaneously advanced by the push rod 6, the rotary cam 7, the rod 8, etc., and after passing through the state shown in FIG. 4, the writing member 10 is moved forward as shown in FIG. , the small diameter portion 13 of the writing member 10 is in a state protruding from the tip opening 18 of the inner cylinder 16. At this time, the rotary cam 7 is also moving forward while compressing the spring _S1 , and is at a position slightly advanced from the front edge of the cam wall 5. Then, when the push on the lock cap 29 is released in the state shown in _FIG .
In this case, the rotary cam 7 is pushed back by the spring S ₁ and rotates a little while retreating, and is stopped by the front edge of the cam wall 5, thereby preventing the tip of the writing member 10 from touching the base 30. The pen protrudes from the opening 31 at the tip and enters the writing state shown in FIG. Continue writing in this writing state.

Conversely, to change from the writing state to the sealing state, the knock cap 29 is knocked in the state shown in FIG.
As the knock cap 29 moves forward, the rotary cam 7 is moved forward a little via the push rod 6. Rotating cam 7
When the push of the lock cap 29 is released when the rotary cam 7 reaches the state shown in FIG. 5 in which it is slightly advanced from the front edge of the cam wall 5, the rotary cam 7 rotates a little, and then is pushed back inside the cam wall 5 by the spring _s1 . , the writing member 10 also moves backward and is prevented from moving back when the rear end of the connecting member 11 hits the packing 15 attached to the front end of the bushing 9. At this time, the writing member 10 is completely stored in the inner cylinder 16. It is now in a state of disrepair.

At the same time, the sliding tube 27 and the like are pushed back by the spring S ₂ , but when the cap 30 retreats, the inclined surface 32 on its inner surface pushes the seal body 21 and presses the sealing material 22 against the tip of the inner periphery 16 to open the tip. The portion 18 is closed to return to the sealed state shown in FIG.

Next, a second embodiment of the present invention will be explained with reference to FIG. In the first embodiment, when the knock cap 29 is knocked, the sliding tube 27 and the writing member 1 are
0 moves forward at the same time, but the second
In the embodiment, there is a slight gap between the rear end of the push rod 6 and the knock cap 29 in the sealed state, so that when the knock cap 29 is knocked, the sliding tube 27 etc. move forward first, and the knock cap 29 moves forward from the push rod. 6 and then the writing member 10
We are also trying to move forward together. Even in this case, the same operation as in the first embodiment can be achieved. In the second embodiment, the writing member 10 can be placed in advance by the distance in front of the writing member 10 in the first embodiment.

Next, a third embodiment of the present invention will be explained with reference to FIG. In the third embodiment, a through hole 33 is formed in the center of the knock cap 29, and the push rod 6 is made slightly longer so that the push rod 6 projects rearward through the through hole 33 of the knock cap 29 in a sealed state. In the sealed state, the distance between the tip of the writing member 10 and the sealing material 22 is made longer than the length of the push rod 6 projecting rearward from the knock cap 29. To change from the sealed state to the writing state, first move the writing member 10 forward by knocking the push rod 6, and after the rear end of the push rod 6 and the rear end of the knock cap 29 are aligned, push the push rod 6 and the knock cap 29 together. The writing member 10 and the sliding tube 27 are moved forward together. Even if you do this,
The same operation as the first embodiment and the second embodiment can be performed.

Next, a fourth embodiment of the present invention will be explained with reference to FIG. In the fourth embodiment, the seal body 21 is integrally formed at the tip of the inner cylinder 16 with a hinge 34 interposed therebetween.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. 10 and 11. In the fifth embodiment, the seal body 21 and the ring 35 are integrally molded from an elastic material via a hinge 34, and the ring 35 is integrally formed with an elastic material.
5 is fitted into the small diameter portion 17 of the inner cylinder 16, and a retaining ring 36 is fitted around the outer periphery of the ring 35 for installation.

Next, a sixth embodiment of the present invention will be explained with reference to FIGS. 12 and 13. In the sixth embodiment, the seal body 21 is divided into two parts at the center so that the seal body 21 opens in a double door shape.

Next, a seventh embodiment of the present invention will be described with reference to FIG. 14. In the first embodiment, in the writing state, the cap 30 hits the seal body 21 and the seal body 2
1 is in contact with the writing member 10. That is, the seal body 21 constitutes a locking means for holding the sliding tube 27 at an intermediate position, and the sliding tube 27 and the like are moved back by the seal body 2.
This means that the writing member 10 is blocking the writing via 1. In the seventh embodiment, the inner edge of the tip opening 31 of the cap 30 is connected to the small diameter portion 13 of the writing member 10.
The writing member 1
0 directly supports the sliding tube 27 and the like.

Next, an eighth embodiment of the present invention will be explained with reference to FIG. 15. In the first embodiment, the sliding tube 27
A spring S ₂ that urges the rearward force of
S ₂ is housed inside the push rod 6 so that it is not visible.

Next, a ninth embodiment of the present invention will be described with reference to FIG. 16. In the ninth embodiment, the push rod 6
and the knock cap 29 are integrally molded.

Next, a tenth embodiment of the present invention will be explained with reference to FIG. 17. In the tenth embodiment, the knock cap 29 is made somewhat long so that the slits 28, 28 of the sliding tube 27 are completely hidden.

Next, an eleventh embodiment of the present invention will be explained with reference to FIG. In the eleventh embodiment, a spring _S1 for biasing the writing member 10 rearward is fitted between a step near the front end of the inner cylinder 16 and a step at the front portion of the writing member 10. In addition, the writing member 10
Form a depression at the rear end of the
By pushing the mounting piece 46 fitted onto the front end of the rod 8, the mounting piece 46 can be attached to the front of the rod 8.
The writing member 10 is removably attached via.

Next, a twelfth embodiment of the present invention will be explained with reference to FIG. In the twelfth embodiment, the sliding tube 2
Long slits 28, 28 are inserted from the front of 7, and the sliding tube 27 is inserted from the rear for assembly. A ring 47 is fitted on the inner periphery of the front end of the sliding tube 27 for reinforcement. The ring 47 may be fitted onto the inner periphery of the cap 30 to reinforce the bending of the sliding tube 27 in the inner radial direction.

Although a number of embodiments of this invention have been shown above, the embodiments of this invention are not limited to the above embodiments.

For example, in the first embodiment, the rear seal is performed by the packing 15, but the bushing 9 is made of an elastic material without using the packing 15, and the bushing 9 constitutes the second sealing member.
This also allows for sealing. Also, inner cylinder 1
A seal ring (not shown) that slides into contact with the writing member 10 near its rear end may be provided on the inner circumferential surface of the writing member 6, thereby forming a second seal member. Further, in the first embodiment and the like, the sealing material 22 is provided on the back surface of the sealing body 21, but the sealing material 22 may be omitted by making the sealing body 21 from an elastic material. Instead of using the sealing material 22, a seal ring or the like made of an elastic material may be attached to the tip of the cylinder 16, or the inner cylinder 16 itself may be formed of an elastic material. It is convenient to make the tip of the sliding tube 27 transparent so that the internal operation can be confirmed.

As is clear from the above, in the writing instrument according to the present invention, in order to change from the sealed state to the writing state, for example, the knock cap provided on the sliding barrel is knocked, and the sliding barrel or writing member is moved forward. All you have to do is That is, when the sliding tube moves forward against the first biasing member, the pressing force of the first biasing member on the first sealing member is released, and the first sealing member rotates and presses the inner cylinder. The tip opening is open. Then, the writing member moves forward against the second biasing member, and the writing portion thereof protrudes from the tip opening of the inner cylinder, and the writing member is held at the forward position by the holding means. Thereafter, when the sliding tube retreats from the forward position due to the biasing force of the first biasing member, the sliding tube is prevented from returning at the intermediate position by the locking means,
The writing part protrudes from the tip of the sliding tube to be in a writing state.

Next, when the holding means for the writing member is released, the writing member retreats and is housed in the inner cylinder, and then the first The first sealing member is rotated by the urging force of the urging member to seal the tip opening of the inner cylinder. Furthermore, since a second seal member is provided at the rear position as well, which seals between the writing member and the inner periphery, both the writing portion and the air hole of the writing member are sealed.

Therefore, according to the present invention, (a) the operation is very simple since all that is required is to move the sliding tube and the writing member forward and backward in order to enter the writing state or the sealed state; It is.

(b) Sealing of the tip opening of the inner cylinder by the first sealing member is performed via the sliding cylinder by the urging force of the first urging member, and by the forward movement of the sliding cylinder,
Since the structure is such that the seal of the first seal member is released and writing is possible using the writing member, the writing part of the writing member does not come into contact with the first seal member, and unreasonable force is applied to both. There is no staining of the seal member or damage to the writing section.

(c) Since the seal in the sealed state is achieved by the first seal member provided at the tip of the inner cylinder and the second seal member located behind the air hole formed in the writing member, It can be sealed regardless of the position of the air hole in the writing member, and generally commercially available writing members can be used.

[Brief explanation of the drawing]

1, 4, 5 and 6 are sectional views showing the operation of the first embodiment of the present invention, FIG. 2 is an exploded perspective view showing essential parts of the first embodiment, and FIG. The figure is an assembled perspective view of what is shown in Fig. 2, Fig. 7 is a sectional view of the second embodiment, Fig. 8 is a sectional view of the third embodiment, and Fig. 9 shows main parts of the fourth embodiment. A perspective view, FIG. 10 is a perspective view showing the main part of the fifth embodiment, FIG. 11 is a sectional view showing the main part of the fifth embodiment, and FIGS. 12 and 13 respectively show the operation of the sixth embodiment. 14 and 15 are cross-sectional views of main parts showing
16, 17, and 18 are the seventh embodiment, the eighth embodiment, the ninth embodiment, and the seventh embodiment, respectively.
FIG. 19 is a cross-sectional view showing essential parts of the tenth embodiment and the eleventh embodiment, and FIG. 19 is a cross-sectional view of the twelfth embodiment. DESCRIPTION OF SYMBOLS 1... Axis cylinder, 10... Writing member, 14... Writing part, 15... Packing, 16... Inner cylinder, 18...
...Tip opening, 21...Seal body, 27...Sliding tube.

Claims (1)

[Scope of Claims] 1 a: a shaft cylinder 1; b: a sliding cylinder 27 accommodated in the shaft cylinder 1 so as to be slidable between forward and backward positions along its axis; and c: this sliding cylinder. a first biasing member S ₂ that constantly biases the movable barrel 27 against the shaft barrel 1 toward the retracted position;
and d an inner cylinder 16 housed in the sliding cylinder 27 and having a tip opening 18 formed at its tip and connected to the shaft cylinder 1; , a writing member 10 which is housed so as to be movable between a forward position protruding from a tip opening 18 of the inner tube 16 and a retreated position housed within the inner tube 16, and having a writing portion 14 formed at its tip; , f a second biasing member S ₁ interposed between the writing member 10 and the barrel 1 and constantly biasing the writing member 10 toward the retracted position; g a rocker at the tip of the inner barrel 16; When the sliding tube 27 and the writing member 10 are in the retracted position, the sliding tube 27 is moved freely and biased in the opening direction, and when the sliding tube 27 and the writing member 10 are in the retreated position, the sliding tube 27 is moved by the biasing force of the first biasing member _S2. a first sealing member 21 that seals the tip opening 18 of the inner tube 16; a second sealing member 1 that seals between
5 and i When the sliding tube 27 and the writing member 10 move to the forward position against the first and second biasing members S ₂ and S ₁ , respectively, only the writing member 10 is moved to the forward position. a holding means for holding the sliding tube 27 at an intermediate position where the writing member 10 protrudes from the sliding tube 27 when the sliding tube 27 returns to the retracted position; A writing instrument comprising: a locking means for preventing the above-mentioned.