JP3139002B2 - Extruded writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a hand-operated operation in which a tip writing portion of a writing body is made to protrude and retract from an opening of a main body, or when the writing body is an internal mechanism of a mechanical pencil, The present invention relates to an extruding writing instrument that allows a lead to be drawn out by hand.

Therefore, the present invention can be widely used as an alternative to a conventional writing implement having a tip writing portion retracting mechanism such as a knock type or a rotary type, and a lead-out mechanism.

[Conventional technology and its problems]

2. Description of the Related Art Conventionally, as a writing instrument for causing a tip writing portion of a writing body to protrude and retract from an opening of a main body, one that knocks a rear end and one that relatively rotates a front portion and a rear portion of a main body have been developed and spread.

In addition, as a mechanical pencil, the tip writing part can be moved in and out, and the lead can be drawn out.As a mechanical pencil, a so-called double knock type mechanical pencil that draws out the tip writing part with a large knock and draws out the lead with a small knock. A so-called rotary-knock mechanical pencil has been developed and commercially available, in which the front and rear portions are rotated relative to each other so that the tip writing portion protrudes and retracts, and the rear end is knocked out to extend the lead.

However, all of these operations are troublesome because after holding the main body at the time of writing, the user has to change his / her fingers to knock or rotate with both hands. Further, in the case of a mechanical pencil, the double knock type has a problem that it requires extra effort to make a large knock and a small knock, and an extra core is extended by a large knock when it is built in. The rotary knock type is bothersome because both rotation and knock must be performed.

[Problems to be solved by the invention]

The present invention solves the above-mentioned problems of the prior art, and allows the tip writing portion of the cursive to be protruded and retracted from the opening of the main body, and also allows the core to be rotated when the cursive is an internal mechanism of the mechanical pencil. It is another object of the present invention to provide an extruding writing instrument which can be put out by hand while holding the main body at the time of writing.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention provides an opening (usually provided at the front end, but provided at both ends when a double-headed writing instrument such as a composite writing instrument or a two-color writing instrument) where the tip writing section of the cursive body appears and disappears. A writing body, a writing body (including a part of the writing body and a member interlocked with the writing body) which is always accommodated in the body by being urged in a retreating (built-in) direction by a compression spring or a tension spring or the like; And an extruded piece arranged in front of the main body which can be operated by one finger (thumb or forefinger) outside of the main body while holding the main body at the time of writing, and When the cursive body advances to a writable position, the cursive body is automatically locked to the main body, and the locking release body disposed in front of the main body, which can be operated with one finger at hand, is radially moved. Pressing and releasing means It is characterized.

The cursive body is an internal mechanism of the mechanical pencil (generally referred to as a "structure", which includes an internal base, a core holder, a chuck, a fastener, a fastener receiver, a chuck spring, a core case, and the like). In such a case, the force of the built-in spring that constantly urges the internal mechanism in the backward direction is weaker than the force of the chuck spring (the force of the chuck spring is the force of the built-in spring and the friction force between the locking piece and the main body described later). It must be stronger than the sum), the rear part of the chuck (including the joint pipe and the core case) and the extruded piece are connected, and a fastener receiver (including a member interlocking with the fastener receiver) and the main body are provided. The locking and unlocking means are provided, and when the internal mechanism advances and is automatically locked at the writable position, the step portion of the front portion of the internal base abuts or slightly contacts the inner surface of the opening of the main body. Gap To configured to be positioned with a.

When the writing body is a ballpoint pen refill (regardless of shape, size, oiliness, or water), a member (which may be integral with or separate from the refill) interlocking with the refill is used. An extruded piece is connected, and the interlocking member and the main body are provided with the locking and unlocking means.

Further, the locking and unlocking means is provided on the side of the writing body (a fastener receiver in an internal mechanism of the mechanical pencil,
An interlocking member of a ball-point pen) is provided with a locking piece that is always urged to open outward (including one that opens by itself), and a locking portion that engages with the locking piece is provided on the main body side. In this case, the locking is automatically performed, and the unlocking body provided on the main body side is pressed in the radial direction with one finger by hand to release the locking.

(Operation)

According to the present invention, as described above, one finger (thumb or index finger) is shifted (retracted) to a position where the extruded piece can be extruded while holding the main body during writing, and then the extruded piece is moved. When the extruded piece is advanced, the extruded piece is connected to the cursive body, so that the cursive body also advances with the advance of the extruded piece. Further, since the writing piece is provided with a locking piece that is always urged to open outward, the locking piece is pushed forward while elastically contacting the inner surface of the main body, and moves forward as the writing piece advances. When the tip writing portion of the writing body advances to a writable position protruding from the opening of the main body, the locking piece is automatically locked by engaging with the locking portion provided on the main body.

When cursive is the internal mechanism of a mechanical pencil,
Since the force of the chuck spring is stronger than the sum of the force of the built-in spring and the frictional resistance between the locking piece and the inner surface of the main body, the chuck spring shrinks the built-in spring reservoir without shrinking, and the internal mechanism moves forward. Then, the fastening piece provided on the fastener receiver or a member interlocked with the fastener receiver is engaged with the locking part provided on the main body, and the internal mechanism is automatically locked at the writable position. When writing is performed in this state, the writing pressure is received by the main body via the fastener receiver, and there is no occurrence of slippage in the chuck.

When the core projecting from the tip of the inner die is worn and the core is to be fed, the pushing piece in the advanced position may be pushed further forward. Since the extruded piece is connected to the rear portion of the chuck, and the inner die cannot be advanced because the step portion of the front portion is almost in contact with the inner surface of the opening of the main body, the chuck retracts the chuck spring and advances. In other words, the extruded piece is pushed out against the force of the chuck spring. However, the chuck spring has the same strength as that of a normal knock type mechanical pencil. The force of the chuck spring is increased to prevent the core from slipping), and the force for pushing out the extruded piece does not need to be so strong.

When the internal mechanism of the mechanical pencil moves forward and is at the writable position, the core is extended when the extruded piece is further pushed out. The core is extended when the rear end of the mechanical pencil is knocked. Is the same as
Description is omitted.

When the cursive body is locked at the writable position, the unlocking body provided on the main body is slightly raised from the outer peripheral surface of the main body. All you have to do is move one finger and push the body in the radial direction. The engagement between the locking piece and the locking portion is released, and the writing body is retracted by the force of the built-in spring. The force of the built-in spring is a weak force that only keeps the cursive body in a built-in state, that is, the tip writing part does not come out of the opening of the main body even if you carry it and run down the stairs. The impact of cursive retreat is not so strong. Cursive, part of it hits the step in the main body and stops, the foot of the extruded piece hits the rear end of the slit provided in the main body, the rear end of the member that works with the cursive is the rear end of the main body. It hits the inner surface and stops, and it is in a built-in state.

When the cursive is a ballpoint pen refill,
What is necessary is just to advance the tip writing part to the writable position, and it is not necessary to configure so that the extruded piece can be further advanced.

The pushing of the unlocking member in the radial direction does not necessarily have to be performed with a finger, and the extruded piece may be retracted and sunk (pushed in the radial direction).

〔Example〕

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

FIGS. 1 to 7 show a first embodiment of the present invention, in which a cursive body is an internal mechanism of a mechanical pencil.

FIG. 1 is a front view when the cursive is in a built-in state, FIG.
FIG. 3 is a side cross-sectional view in the state of FIG. 1, and FIG. 3 is a side cross-sectional view when the cursive body is at a writable position.

In the figure, reference numeral 1 denotes a base provided with an opening 1a at the front end. A step portion 1b is provided on the inner surface of the opening portion 1a so that a step portion of an internal base described later comes into contact with the step portion 1b. Further, a slight horizontal portion is provided at the rear end of the tapered portion, and a rear portion (right side in the figure) is a horizontal small diameter portion, and this portion is externally threaded. The base 1 is made of metal, synthetic resin, or the like. Reference numeral 2 denotes a front barrel, which has an internal thread on the inner surface of the front end portion. The inner surface of the rear end portion has a large diameter. Although the front barrel 2 has a circular cross section, a portion where an extruded piece described later moves forward and backward is a concave portion 2a, and the concave portion 2a is a horizontal surface. In addition, a slit 2b through which a foot of an extruded piece described later passes is provided at a substantially central portion of the concave portion 2a. An unlocking member 2c having a width slightly smaller than the width of the concave portion 2a is continuously provided at a rear portion of the concave portion 2a. The unlocking member 2c is provided so as to be swingable in the radial direction, and has a substantially circular protrusion 2d at the rear end. Since the front barrel 2 is a part to be held by a finger at the time of writing, a knurling 2e for fingerholding is provided on most of the outer surface (excluding the concave portion 2a). A single slit 2f is cut to the rear end of the front barrel 2 behind the portion serving as the front fulcrum of the unlocking body 2c. The rear end of the unlocking body 2c is slightly shorter than the rear end of the front barrel 2.

FIG. 6 shows a male screw at the rear end portion of the base 1 and a female screw at the front end portion of the front barrel 2 screwed together.

Next, a rear barrel 3 is prepared. The front end of the rear barrel 3 has a small diameter portion, and a single slit is cut in this portion. The rear end of the slit is an engaging portion 3a. Also,
A spring stopper 3b is provided on the inner periphery of the front part. The rear end has an opening, and an eraser 5 with a cleaner pin 4 inserted.
Is fitted. A clip 6 is integrally provided on the rear portion (see FIG. 1).

The small diameter portion of the front end portion of the rear barrel 3 is press-fitted into the large diameter portion of the inner surface of the rear end portion of the front barrel 2 so that the slits coincide with the slits 2f of the front barrel 2. The main body is formed by the base 1, the front barrel 2, and the rear barrel 3.

Next, an elongated elliptical extruded piece 7 is prepared, and the extruded piece 7 is provided with a knurling 7a for fingerholding on the top surface.
Also, a foot 7b is provided vertically at almost the center of the extruded piece 7,
A donut-shaped receiving portion 7c is provided on the foot 7b. These three members are formed as an integral molded product, and FIG. 7 shows a state viewed from the front.

Next, an internal mechanism of the mechanical pencil which is a cursive type will be described.

Reference numeral 8 denotes an inner base, and the tip small diameter portion 8a has the base 1 described above.
In the opening 1a. A step portion 8b is provided at the rear end of the small diameter portion 8a, and a tapered conical portion is provided rearward from the step portion 8b, and a straight cylindrical portion is provided at the rear end. An internal thread is cut into the inner surface of the straight cylindrical portion at the rear end. The core pipe 9 is press-fitted into the small-diameter portion 8a at the tip of the inner base 8. Behind it, a core holder 10 made of an elastic body such as rubber and always holding the core with a certain force.
Is press-fitted from behind the inner base 8.

Next, the fastener receiver 11 is prepared, and an external thread is cut on the outer periphery of the distal end portion of the fastener receiver 11. The large-diameter portion extends from the rear end of the male screw to the rear, and a flange 11a is provided on the outer periphery of the front end of the large-diameter portion. Also, at the center of the circumference,
1b is provided. The protruding edge 11b serves to prevent retraction of a fastener to be described later and also serves as a spring stop.
The cylindrical body 11c is press-fitted into the fastener receiver 11, and the front end of the cylindrical body 11c contacts the flange 11a. One slit on the cylindrical body 11c
Although the slit 11d is provided, the slit 11d also allows the foot 7b of the pushing piece 7 to pass therethrough, similarly to the slit 2b of the front barrel 2 described above. The cylindrical body 11c is provided with a locking piece 11e behind the slit 11d. The locking piece 11e is made of a molded product integral with the cylindrical body 11c so as to always open outward (see FIG. 5), and a projection 11f is formed on the outer surface of the rear end of the locking piece 11e.
However, the rear end of the projection 11f is slightly shorter than the rear end of the cylindrical body 11c.

Next, the fastener 12 and the chuck 13 are fitted into a portion of the fastener receiver 11 forward of the protruding edge 11b. The fastener 12 is loosely fitted to slide between the step 8c on the inner surface of the inner base 8 and the protruding edge 11b. In addition, the chuck 13 has a splitting or splitting head having an expanding force.
2 and 3 (FIGS. 2 and 3 show a state where the lead is held, and FIG. 4 shows a state where the lead is released). A lead case 15 is connected to the rear of the chuck 13, and a spare lead is placed in the lead case 15. The front end of the inner surface of the lead case is formed in a tapered shape, and serves as a lead guide for feeding the leads in the lead case 15 one by one into the chuck 13. A collar 15a is also provided on the outer periphery of the front end of the core case 15.
Is provided. A chuck spring 16 is interposed between the front end surface of the lead case 15 and the protruding edge 11b on the inner periphery of the fastener receiver 11.

The internal mechanism of the mechanical pencil is constructed as described above. In a natural state, the chuck 13 is fitted to the fastener 12 by the chuck spring 16 and clamps the core as shown in FIGS.

Next, a male screw is cut on the outer periphery of the rear end of the core case 15, and a built-in spring 17 is fitted into the core case 15, and then a ring 18 with a female screw is screwed into the male screw at the rear end of the core case 15. The built-in spring 17 is provided in a state where a front end thereof is in contact with a spring stopper 3b in the rear barrel 3 and a rear end thereof is slightly compressed in contact with the ring 18. The force of the built-in spring 17 is smaller than the force of the chuck spring 16 described above.

 Next, assembly will be described.

First, the slit 2f of the front barrel 2 is aligned with the slit at the front end of the rear barrel 3, and the rear barrel 3 is press-fitted into the front barrel 2 and fixed by bonding or the like. Next, the cylindrical body 11c is inserted from the front of the front barrel 2 and the slit 2b of the front barrel 2 is aligned with the slit 11d of the cylindrical body 11c. In this state, the extruded piece 7, the foot 7b and the receiving portion 7c are integrally formed, and the receiving portion 7c
Is parallel to the slit 2b of the front barrel 2 (at this time, the extruded piece 7 is orthogonal to the slit 2b).
2b, put in the slit 11d. When the extruded piece 7 is rotated by 90 degrees after the receiving portion 7c has entered the cylindrical body 11c, the state shown in FIG. 7 is obtained (the extruded piece 7 is accommodated in a parallel state in the recess 2a).

Next, the assembled fastener receiver 11, fastener 12, chuck 13, chuck spring 16, and lead case 15 are inserted from the front of the donut-shaped receiving portion 7c, and the fastener receiver 11 is positioned in front of the cylindrical body 11c. Press into part. Next, the internal spring 17 is dropped into the rear barrel 3 from behind the lead case 15, and the ring 18 is attached to the lead case 15 with the built-in spring 17 slightly contracted.
Screw on the back end. Eraser 5 with cleaner pin 4
To the rear end of the rear barrel 3. Next, the inner base 8 having the core pipe 9 and the core holder 10 is screwed into the fastener receiver 11. Finally, when the base 1 is screwed into the front barrel 2, the first
The assembly shown in FIG. 2 is assembled.

 The operation of the first embodiment is as follows.

1 and 2, holding the main body in the cursive state shown in FIG.
When one finger (for example, thumb) is moved backward as it is to advance the pushing piece 7, the flange 15a of the lead case 15 is advanced through the foot 7b and the receiving part 7c. At this time, the force of the chuck spring 16 is greater than the sum of the force of the built-in spring 17 and the frictional force of the protrusion 11f elastically contacting the inner surface of the rear barrel 3, so that the chuck spring 16 does not shrink. By retracting the built-in spring 17, the entire internal mechanism moves forward. Then, when the rear end of the locking piece 11e reaches the rear end of the slit 2f of the main body, the locking piece 11e fits into the slit 2f, and is in the state shown in FIG. That is, a step portion in the front part of the inner base 8
8b is substantially in contact with the step 1b on the inner surface of the opening 1a of the base 1, that is, in a writable position in which the contact or a slight gap is provided. It is locked to the engaging portion 3a.

Writing is performed in this state, and when the core protruding from the tip of the core pipe 9 is worn, the extruded piece 7 is further moved in the state of FIG.
Press forward. The step 8b of the internal base 8 immediately contacts the step 1b on the inner surface of the opening 1a of the base 1, and the internal base 8,
The fastener receiver 11 and the cylindrical body 11c cannot advance. Then, the chuck spring 16 is contracted (the internal spring is also contracted at the same time), and the lead case 15 and the chuck 13 are moved forward. Since the chuck 13 and the fastener 12 are fitted and the wick 14 is moved forward by the distance 1 shown in FIG. 3, the wick is extended by a length 1 from the tip of the wick pipe 9 as shown in FIG. And then the chuck
13 comes out of the fastener 12 and expands to release the pinching of the core. Then, when the pushing of the pushing piece 7 is released, the chuck 13 and the fastener 12 are retracted by the force of the chuck spring 16 and are fitted again to clamp the core 14 (to be in a writable state).

The function of feeding out a fixed length lead every time the lead case advances is the same as that of a normal knock type mechanical pencil.

After the writing, the core pipe 9 protruding from the opening of the base 1 and the small-diameter portion 8a of the tip of the inner base 8 can be retracted into the main body with one finger by hand at the state shown in FIG. What is necessary is just to push the projection 2d at the rear end of the unlocking body 2c in the radial direction. Since the rear end of the unlocking body 2c presses the projection 11f of the locking piece 11e, the engaging portion 3a
The locking piece 11e is released by the force of the built-in spring 17 and returns to the state shown in FIG.

Next, a second embodiment of the present invention will be described with reference to FIGS. The cursive type of the second embodiment is a ballpoint pen refill.

In the drawings, the same reference numerals as those described in the respective drawings of the first embodiment indicate the same or similar parts.

FIG. 8 is a cross-sectional view when the cursive is in a built-in state, and FIG. 9 is a cross-sectional view when the cursive is in a writable position.

In the figure, reference numeral 1 denotes a base provided with an opening 1a at the front end. The rear part (right side in the figure) from the tapered conical part is a straight cylindrical part, and the inner surface thereof is internally threaded. Reference numeral 22 denotes a shaft cylinder having an external thread cut on the outer periphery of the small diameter portion at the tip. Although the barrel 22 has a circular cross section,
The portion where the pushing piece 7 moves back and forth is a concave portion 22a, and the concave portion 22a is a horizontal plane. Almost in the center of the recess 22a,
A slit 22b through which the foot 7b of the extruded piece 7 passes is provided. An unlocking member 22c having a width slightly smaller than the width of the concave portion 22a is provided at a rear portion of the concave portion 22a so as to be swingable in the radial direction. The unlocking body 22c is a thin molded product, and sinks in the radial direction only by applying a light force. A slit 22g having the same width as the concave portion 22a is provided also in this sinking portion, and the rear end of the slit is
2h. At the rear end of the unlocking body 22c, a raised portion 22d having a rounded front and rear is formed, and a projection 22i is formed on the back surface thereof.
Is provided. A knurling 22e for fingerholding is provided on a portion of the barrel 22 which is held by a finger during writing, except for the concave portion 22a. An internal thread near the rear end opening of the barrel 22 is threaded, and the male thread of the tail plug 19 with clip is threaded.

 The main body is formed by the base 1, the barrel 22, and the tail plug 19.

Next, an extruded piece 7 provided with a knurl 7a on the top surface, a foot 7b of the extruded piece, and a receiving portion 7c are prepared. However, these are the same as in the first embodiment, and the description is omitted.

Next, a refill case 20 is prepared. Refill case 20
Has a cylindrical shape, and the opening at the front end is slightly trumpet-shaped so that the rear end of the refill does not support it. Further, a flange 20a is provided on the outer periphery of the front portion, and the flange 20a is received by the receiving portion 7c. Notch in front of refill case 20
20b is provided, and a locking piece 20c formed so as to always open outward is integrally attached to the cutout portion 20b. Locking piece 20c
The rear end has a rounded protruding portion 20d. FIG. 10 shows the front part of the refill case.

Next, the refill 21 is prepared, and the built-in spring 17 is arranged between the step in the front part of the refill 21 and the step in the front part of the base 1.

 The assembly of the above writing implement is as follows.

First, the tail plug 19 is screwed into the rear end of the barrel 22. Next, the first
In the same manner as in the embodiment, the extruded piece 7, the foot 7b, and the receiving portion 7c are passed through the slit 22b of the barrel, and the receiving portion 7c is put into the barrel 22. Next, the refill case 20 is inserted from the front end opening of the shaft cylinder 22, and the flange 20a is received by the receiving portion 7c. At this time, since the protrusion 20d of the locking piece 20c is rounded at the upper rear end, the locking piece 20c passes through the inside of the donut-shaped receiving portion 7c in a state where it is sunk in the radial direction. Next, the refill 21 is housed in the refill case 20, and finally the base 1 with the spring 17 is screwed into the front end of the barrel 22. This completes the assembly, and the state shown in FIG. 8 is obtained. In the state shown in FIG. 8, when the pushing piece 7 is pulled in the retreating direction by a finger, the unlocking member 22c and the raised portion 22d are formed.
Is pushed out in the radial direction, and the extruded piece can retreat until the foot 7b hits the rear end of the slit 22b or the rear end of the extruded piece 7 hits the engaging portion 22h.

 Next, the operation will be described.

When the push-out piece 7 is pushed forward by the hand operation in the state of the built-in refill shown in FIG. 8, the refill 21 is moved through the built-in spring 17 via the foot 7b, the receiving portion 7c, the flange 20a and the refill case 20.
While retracting, is advanced to the writable position shown in FIG. At this time, together with the refill case 20, the locking piece 20c also has the protrusion 20d.
Moves forward while elastically contacting the inner surface of the barrel 22, and the locking piece
Since the rear end of 20c enters the slit 22g, the engaging piece 20c engages with the engaging portion 22h and locks.

Writing is performed in this state, and when the writing is completed, the extruded pieces 7 are retracted by a manual operation. Since the rear portion of the pushing piece 7 pushes the unlocking body 22c in the radial direction through the raised portion 22d, the locking is released from the state shown in FIG.
Refill case 20 and refill 21 both receded due to
Return to the built-in state in the figure.

Although two embodiments have been described above, the present invention is not limited to these embodiments. For example, in a case where the cursive body is an internal mechanism of a mechanical pencil, the front barrel 2 and the rear barrel 3 may be a barrel integrally formed.
The method of providing the unlocking members 2c and 22c and the method of providing the locking pieces 11e and 20c are optional. The shapes and mounting methods of the extruded piece 7, the foot 7b, and the receiving portion 7c may be arbitrary. In addition, integration of parts and design changes are free.

〔The invention's effect〕

As described above, according to the present invention, the following effects can be obtained.

(I) The tip of the writing body is connected to the writing body which is always biased in the retreating direction and accommodated in the body having an opening through which the tip writing part of the writing body appears and disappears. An extruding piece disposed in front of the main body which can be operated by a finger, and the cursive body is automatically locked to the main body when the cursive body advances to a writable position with the advancement of the extruding piece; Means for pushing the unlocking body disposed in front of the main body, which can be operated by one finger at hand, in the radial direction to release the main body. The tip writing section can be protruded and retracted from the opening of the main body, and when the writing body is an internal mechanism of the mechanical pencil, the lead can be pulled out by hand operation, so that use is simple.

(Ii) Since the main body receives the writing pressure during writing, in the case of a mechanical pencil, center slip does not occur even if the force of the chuck spring is not particularly increased. In addition, since the force of the chuck spring is not particularly strong, the force for pushing the extruded piece at the time of core feeding is small.

(Iii) Since the number of parts is small and assembly is easy, it can be provided at low cost.

[Brief description of the drawings]

FIGS. 1 to 7 show a first embodiment of an extruded writing instrument according to the present invention. FIG. 1 is a front view showing a built-in writing body, FIG. 2 is a side sectional view thereof, and FIG. FIG. 4 is a side sectional view showing a state where the writing body is locked at a writable position, FIG. 4 is a side sectional view showing a state where the lead is extended and the chuck releases the clamping of the lead, and FIGS. 7 is an enlarged perspective view of a main part, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 2, FIGS. 8 to 11 show a second embodiment, and FIG. FIG. 9 is a sectional view showing a writable state, and FIG.
FIG. 11 is an enlarged perspective view of a main part. DESCRIPTION OF SYMBOLS 1 ... Base, 1a ... Opening, 1b ... Step, 2 ... Front barrel, 2a ... Depression, 2b ... Slit, 2c ... Unlocking body,
2d: Projection, 2e: Knurl, 2f: Slit, 3 ...
... rear barrel, 3a ... engaging part, 3b ... spring stop, 4
… Cleaner pin, 5… Eraser, 6… Clip,
7 ... Extruded piece, 7a ... Knurl, 7b ... Feet, 7c ...
Receiving part, 8 ... Internal cap, 8a ... Tip small diameter part, 8b ... Step, 8c ... Inner step, 9 ... Core pipe, 10 ... Core holder, 11 ... Fastener receiver, 11a …… Flange, 11b …… Protrusion, 11
c ... cylindrical body, 11d ... slit, 11e ... locking piece, 11f ...
... Projection, 12 ... Fastener, 13 ... Chuck, 14 ... Core, 15
... Core case, 15a ... Flange, 16 ... Chuck spring, 17 ... Built-in spring, 18 ... Ring, 19 ... Tail plug, 20 ... Refill case, 20a ... Flange, 20b ... Notch , 20c… Locking piece, 20d… Protrusion, 21… Refill, 22
…… Shaft barrel, 22a… Recess, 22b …… Slit, 22c
... Slits, 22h ... Engagement parts, 22i ... Projections.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B43K 24/04 B43K 21/16

Claims (4)

(57) [Claims] 1. A body having an opening through which a tip writing portion of a writing body protrudes and retracts, a writing body which is always urged and retracted in the main body in a retreating direction, and which is connected to the writing body and which is connected to the writing body during writing. An extruding piece disposed in front of the main body that can be operated by one finger outside the main body while holding the main body, and the cursive body is moved forward to a writable position with the advancement of the extruding piece. Means for automatically locking to the main body, and radially pressing and releasing an unlocking body disposed in front of the main body which can be operated with one finger at hand. Writing instrument. 2. A body having an opening through which a tip writing portion of a writing body protrudes and retracts, a writing body which is always urged and retracted in the main body in a retreating direction, and which is connected to the writing body and which is connected to the writing body during writing. An extruding piece arranged within a range that can be operated by one finger outside the main body while holding the main body, and the cursive body is advanced when the cursive body advances to a writable position as the extruding piece advances. Means for automatically locking to the main body, and releasing the lock by pushing the unlocking body in the radial direction by a manual operation, wherein the writing body is an internal mechanism of the mechanical pencil, and the internal mechanism is always retracted. The force of the built-in spring biased in the direction is made weaker than the force of the chuck spring, the rear portion of the chuck is connected to the pushing piece, and the locking and unlocking means is provided between the fastener receiver and the main body. , The internal mechanism moves forward When automatically engaged allowing position,
An extrusion-type writing instrument, wherein a step portion of a front portion of an inner base is configured to be abutted on or slightly spaced from an inner surface of an opening of the main body. 3. A writing body which has an opening through which a tip writing portion of a writing body protrudes and retracts, a writing body which is always urged and retracted in the main body in a retreating direction, and which is connected to the writing body, and which is connected to the writing body during writing. An extruding piece arranged within a range that can be operated by one finger outside the main body while holding the main body, and the cursive body is advanced when the cursive body advances to a writable position as the extruding piece advances. Means for automatically locking to the main body, and pressing the unlocking body in the radial direction to release the locking by a manual operation, wherein the writing body is a ballpoint pen refill, and a member interlocked with the refill; An extrusion-type writing instrument, wherein an extruding piece is connected, and the interlocking member and the main body are provided with the locking and unlocking means. 4. The locking and unlocking means is provided with a locking piece urged to always open outward on the writing body side, and a locking piece engaged with the locking piece on the main body side. A locking portion is automatically provided by the engagement of the two, and the unlocking body provided on the main body side is configured to be released by pushing the unlocking body in the radial direction with one finger at hand. Claims 1, 2, 3
The extrusion-type writing instrument according to any one of the above.