JPH0226707Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a writing instrument that effectively seals the writing part of the writing member when the writing part is placed in the stored state. This invention can be applied to writing instruments such as fountain pens, felt-tip pens, and ballpoint pens, but it is particularly effective when applied to writing instruments such as felt-tip pens and water-based ballpoint pens.

The applicant of this application places the writing portion of the writing member in the sealed state or in the writing state by knocking or rotating the seal cap, seal ball, etc., into or out of the sealing position. Various applications have already been filed to make this possible. (Unexamined Japanese Patent Publications No. 58-5299, No. 39499, No. 72089, No. 72089, No. 72089, No. 72089, No. 58
−72088, Utility Model No. 155278, Utility Model Kai No. 1987-
No. 157682). By the way, these things are mainly
Since the seal is performed near the tip of the writing member, an air hole must be provided near the tip of the writing member. Therefore, general writing members on the market cannot be used, and a special writing member is required. There was a risk that we would have to go to the trouble of producing one. In addition, with the above-mentioned writing instruments, it is necessary to point the writing instrument upward or downward in order to place or remove the seal body, such as the seal cap or seal bulb, into the seal position. It had the disadvantage of being directional.

The purpose of this invention is to provide a writing instrument that can be manufactured at low cost by using a commercially available writing member and eliminates the above-mentioned drawbacks.

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

FIG. 1 is a sectional view showing a first embodiment of this invention. 1 is a shaft cylinder, and the shaft cylinder 1 has a cylindrical shape. A cylindrical body 2 having a similar cylindrical shape is prepared, but legs 3, 3 are integrally formed at two positions facing each other on the outer periphery of the cylindrical body 2. By cutting grooves in the axial direction from the rear at two opposing positions on the inner periphery near the rear end of the shaft cylinder 1, and press-fitting the legs 3, 3 into these grooves, the inner rear end of the shaft cylinder 1 is cut. A cylindrical body 2 is attached nearby via legs 3, 3. Note that this cylindrical body 2 may be integrally molded with the shaft tube 1. A cam wall 4 is formed on the rear inner peripheral surface of the cylindrical body 2. The cam wall 4 is provided with an axial groove and an inclined locking edge at the front end. A rotary cam 5 is fitted within the cam wall 4, and a protrusion is formed on the outer periphery of the rotary cam 5, and the protrusion is fitted into a groove in the cam wall 4. And rotating cam 5
The rear surface has a sloped surface. A push rod 6 is arranged behind the rotating cam 5. 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 2. Also,
The rear end of the cylindrical body 2 is squeezed to prevent the push rod 6 from slipping out rearward.

A bushing 7 is attached to the front end of the cylindrical body 2, and a packing 8 made of an elastic material is glued and attached to the front surface of the bushing 7. Then, the rod 9 is fitted into the center hole of the packing 8 and the bushing 7, and the rear end of the rod 9 is fitted into the center hole of the rotating cam 5, so that the rod 9 is received by the rotating cam 5. A mounting piece 10 is attached to the front end of the rod 9.

A separate writing member 11 is prepared, and a recess is formed at the rear end of the writing member 11. By pushing the mounting piece 10 into the recess, the writing member 11 is placed in front of the rod 9 via the mounting piece 10. is installed. A stepped portion 12 and an air hole 13 are formed near the front of the writing member 11. Further, the front portion of the writing member 11 is a small diameter portion 14, and a writing portion 15 is formed at the front end of the small diameter portion 14.

A cylindrical inner cylinder 16 is prepared, but the inner cylinder 16
A step portion is formed near the front end of the step portion, and a small diameter portion 17 is formed in front of the step portion. The tip of the small diameter portion 17 forms a tip opening 18. A seal body 20 is attached to the front end of the small diameter portion 17 via a hinge 19.
The details of this part are clearly shown in FIG.
When no force is applied to the seal body 20, the seal body 20 is in an open state as shown in FIG. A sealing material 21 is adhered to the rear surface of the sealing body 20, and when the sealing body 20 is rotated vertically, the sealing body 21 closes and seals the tip opening 18 of the small diameter portion 17 of the inner cylinder 16. That's how I do it. Then, a spring S ₁ is fitted to the outer periphery of the front part of the writing member 11 while the writing member 11 is positioned between the step 12 of the writing member 11 and the step near the front end of the inner cylinder 16, and the inner cylinder 16 is inserted from the front of the writing member 11. The rear end portion of the inner cylinder 16 is fitted onto the outer periphery of the front portion of the cylindrical body 2. At this time, the outer circumference of packing 8 is
Closely adheres to the inner circumference of 6.

Similarly, a cylindrical sliding tube 22 is prepared,
The vicinity of the front end of the sliding tube 22 is formed into a tapered shape, the inner surface of the vicinity is formed into an inclined surface 23, and a tip opening 24 is formed at the tip. Then, from the rear, slits 25 are formed at two opposing positions on the rear part of the sliding tube 22.
25, fit the sliding tube 22 between the shaft tube 1 and the inner tube 16, and fit the legs 3, 3 through the slits 2.
5, 25, the rear portion of the sliding tube 22 is made to protrude rearward from the rear end opening of the shaft tube 1. Then, by screwing the knock cap 26 into the rear end of the sliding tube 22 while positioning the spring _S2 between the legs 3, 3 and the knock cap 26, the structure shown in FIG. 1 is completed.

Although FIG. 1 shows the sealed state, the sliding tube 22 is pushed back by the spring _S2 , and the sliding tube 22
Since the inner surface of the front end part of
It is blocked and sealed. And, since the rear part of the inner cylinder 16 is sealed by the packing 8,
The writing member 11 is in a sealed state. Note that at this time, the rotary cam 5 is retreating backward within the cam wall 4.

To change from the sealed state to the writing state, the knock cap 26 can be knocked. When the knock cap 26 is clicked, the sliding tube 22 moves forward while compressing the spring _S2 , and at this time, the seal body 20, which is released from the push from the front, rotates slightly forward. Then, the lock cap 26 is placed on the push rod 6.
After it hits, the push rod 6 is pushed forward, and the push rod 6 advances the rotary cam 5, and the writing member 11 is also moved forward via the rod ₉ while compressing the spring S1. When the rear end of the push rod 6 is advanced to the point where it is aligned with the rear end of the cylindrical body 2, the rotary cam 5 is in a position slightly advanced from the front edge of the cam wall 4, as shown in FIG. 11 small diameter portion 14
protrudes from the tip opening 18 of the inner cylinder 16. When the push on the knob cap 26 is released in this state, the sliding tube 22 is pushed back by the spring S ₂ , but the rotating cam 5 of the writing member 11 rotates slightly and is locked to the front edge of the cam wall 4 . Since the writing member 11 is prevented from retreating by
The distal end portion protrudes from the distal end opening 24 of the sliding tube 22, resulting in the writing state shown in FIG. and,
Continue writing in this writing state.

To change from the writing state to the sealed state, the knock cap 26 is tapped in the state shown in FIG. As the lock cap 26 moves forward, it pushes the rear end of the push rod 6 that was slightly protruding toward the rear of the cylindrical body 2, and moves the push rod 6 forward until its rear end is aligned with the rear end of the cylindrical body 2. The state shown in the figure will be reached. At this time, the sliding tube 22 moves forward and the tip of the writing member 11 is completely housed in the sliding tube 22, and the rotating cam 5 is at a position slightly advanced from the front edge of the cam wall 4. . When the push on the knob cap 26 is released, the writing member 11, rod 9, rotary cam 5, etc. are pushed back by the spring _S1 , and when the rear end of the writing member 11 hits the packing 8, their retreat is stopped. However, at this time, the writing member 11 is completely housed within the inner cylinder 16. On the other hand, the sliding tube 22 and the like are also moved back by the spring S ₂ , but when the sliding tube 22 retreats, the inclined surface 23 on the inner surface of the front end pushes the sealing body 20 and pushes the sealing material 21 to the tip of the inner tube 16 . The tip is pressed to close the tip opening 18 and return to the sealed state shown in FIG.

Next, a second embodiment of this invention will be explained with reference to FIGS. 6 and 7. FIG. 6 is an exploded perspective view showing a modification of the method of attaching the seal body 20 to the inner cylinder 16, and FIG. 7 is an assembled view of the structure shown in FIG. 6. Two projecting pieces 27, 27 are provided near the front end of the inner cylinder 16.
, and a small hole 2 is formed in each of the projecting pieces 27, 27.
8,28 are provided. Projecting pieces 29, 29 are also formed on the seal body 20, and small holes 30, 30 are provided in the projecting pieces 29, 29, respectively. A spring 31 is fitted between the protruding pieces 27 and 27 of the inner cylinder 16, and the protruding piece 2
7, 27 between the protrusions 29, 29 of the seal body 20, one pin 32 is inserted between the protrusions 27, 27, 2.
The seal body 2 is attached to the inner cylinder 16 by passing it through the small holes 28, 28, 30, 30 of 9, 29 and the spring 31.
When 0 is installed, the state shown in FIG. 7 will be obtained. At this time, the spring 31 applies a force in the direction in which the seal body 20 opens.

Next, a third embodiment of this invention will be explained with reference to FIGS. 8 and 9. In the third embodiment, the sealing body 20 effectively closes the tip opening 18 of the inner cylinder 16 when changing from the writing state to the sealing state. That is, the seal body 2
0 is formed into a hemispherical shape, and when the sliding tube 22 retreats, the hemisphere of the seal body 20 collides with the inclined surface 23 at the inner tip of the sliding tube 22, and then the inclined surface 23 gradually approaches. As the hemisphere slides on the surface of the inclined surface 23, it gradually closes the tip opening 18 of the inner cylinder 16, resulting in the state shown in FIG. 9.

Next, a fourth embodiment of this invention will be explained with reference to FIGS. 10 and 11. In the fourth embodiment, as shown in FIGS. 10 and 11, the seal body 20 is divided into two at the center, and the seal bodies 20, 20 open in a double-fold shape in the writing state. , is the same as the first embodiment.

Next, a fifth embodiment of this invention will be explained with reference to FIG. In this embodiment, the writing member 1
The sealing means on the rear side of 1 is slightly different from the first embodiment, and sealing is performed between the mounting piece 10 and the inner cylinder 16 by packing 8.

Next, a sixth embodiment of this invention will be explained with reference to FIG. In the first embodiment, the spring S ₁ that biases the writing member 11 backward is arranged in the front, but in the sixth embodiment, the cylindrical body 2
A spring _S1 is placed between a bush 7 and a rod 9 attached near the front end of the spring.

Although several embodiments of this invention have been shown above, the embodiments of this invention are not limited to the above embodiments. For example, although an embodiment of a knob-type writing instrument has been shown, this invention can be applied to a rotating type of writing instrument. Although a cam mechanism is shown as a mechanism for locking the writing member 11 in the forward position or retracting it in the retracted position, a screw feeding mechanism or the like may also be employed. The rear end of the push rod 6 connected to the rear of the writing member 11 and the knock cap 2 at the rear end of the sliding tube 22 in the sealed state.
6, so that when the sliding tube 22 moves forward, the writing member 11 moves forward slightly behind the forward movement of the sliding tube 22. There are many other possible mechanisms for moving the writing member 11 forward. In the first embodiment and the like, the rear seal is performed by the packing 8, but the bushing 7 may be made of an elastic material and sealed by the bushing 7 without using the packing 8. Further, in the first embodiment and the like, the sealing material 21 is adhered to the back surface of the sealing body 20, but the sealing material 21 may be omitted by making the sealing body 20 from an elastic material. A seal ring or the like made of an elastic material may be attached to the tip of the inner cylinder 16 without using the sealing material 21, or the inner cylinder 16 itself may be formed of an elastic material. Alternatively, an O-ring may be attached to the inner circumferential surface of the inner cylinder 16, and the O-ring may be brought into sliding contact with the outer circumferential surface of the large diameter portion of the writing member 11 to perform rear sealing.

As is clear from the above, in the writing instrument according to this invention, the sliding tube 22 is moved forward in order to change from the sealed state to the writing state. The sliding tube 22 moves forward first, and the seal body 20 that was blocking the tip opening 18 of the inner tube 16 is removed from the tip opening 18. Then, a little later, the writing member 11 moves forward and the writing part 15 closes. When the sliding tube 22 protrudes from the tip opening 18 of the inner tube 16 and then retreats, the writing portion 1
5 protrudes from the tip opening 24 of the sliding tube 22 and enters the writing state. Next, when the sliding tube 22 is moved forward and then moved backward, the writing member 11 moves back and is housed in the inner tube 16, and then the sliding tube 22 that retreats pushes the seal body 20 and pushes the tip of the inner tube 16. The opening 18 is closed and sealed, resulting in a sealed state.
To change to writing state or sticker state,
The operation is really simple since it is only necessary to move the sliding tube 22 forward and backward. Since the seal in the sealed state is performed between the position of the tip opening 18 of the inner cylinder 16 and the rear position of the air hole 13 of the writing member 11, commercially available products and other writing members 11 can be securely sealed. It can be stored in a sealed state, and there are no restrictions on the sealing direction.

[Brief explanation of drawings]

1, 3, 4 and 5 are sectional views showing the operation of the first embodiment of this invention, FIG. 2 is a perspective view showing the main parts of the first embodiment, and FIG. 6 7 is an exploded perspective view of the main parts of the second embodiment, FIG. 7 is a perspective view showing the assembled state of the one shown in FIG. 6, and FIGS. 8 and 9 are sectional views of the main parts showing the operation of the third embodiment, respectively. , Figures 10 and 11 are the fourth
FIGS. 12 and 13 are sectional views of essential parts showing the operation of the embodiment, and FIGS. 12 and 13 are sectional views of essential parts showing the fifth embodiment and the sixth embodiment, respectively. DESCRIPTION OF SYMBOLS 1... Axis cylinder, 11... Writing member, 15... Writing part, 16... Inner cylinder, 18... Tip opening, 20...
...Seal body, 22...Sliding tube.

Claims (1)

[Claims for Utility Model Registration] A sliding tube 22 is accommodated in the shaft tube 1 so as to be slidable back and forth along the shaft tube 1, and a tip opening 18 is formed at the tip of the slide tube 22. The inner tube 16 is housed, a commercially available product having a writing member 15 formed at the tip thereof, and other writing members 11 are housed in the inner tube 16, and further between the sliding tube 22, the shaft tube 1, and the writing member 11. A predetermined interval is provided so that when the sliding cylinder 22 moves forward, the writing member 11 is advanced slightly behind the forward movement of the sliding cylinder 22, and a hinge is attached to the opening 18 of the inner cylinder 16 inside near the tip of the sliding cylinder 22. A seal body 20 that opens and closes in a shape is attached, and a sealing means is provided at the rear of the air hole 13 of the writing member 11 between the inner cylinder 16 and the writing member 11, so that when the sliding cylinder 22 moves forward, the seal body 20 opens and closes in a hinge shape. The writing part 15 at the tip of the writing member 11 can be freely protruded outward from the tip of the sliding tube 22 by opening the seal body 20, and when the sliding tube 22 is retracted the most, the inner surface of the front end of the sliding tube 22 is formed. The hinge-shaped seal body 20 is attached to the inner cylinder 1 by
6. A writing instrument characterized in that the writing instrument is formed so as to be pressed against the tip opening 18 of the inner cylinder 16 to close the opening 18 of the inner cylinder 16.