JPH03264397A - Push-out type writing utensil - Google Patents

Abstract

PURPOSE:To deliver a lead by the operation on this side while a main body is held by providing a means for automatically engaging a writing body with the main body when the writing body advances to a writable position and pushing a disengaging body in a diameter direction by the operation on this side to release the engagement. CONSTITUTION:When the flange 15a of a lead case 15 is allowed to advance while a main body is held in a writing body built-in state, the whole of an internal mechanism advances and an engaging piece 11e is fitted in a slit 2f when the rear end of the engaging piece 11e reaches the rear end of the slit 2f of the main body and the internal mechanism is engaged with the engaging part 3a of the main body through the engaging piece 11e at a writable position where the step part 8b of the front part of an internal cap 8 almost comes into contact with the step part 1b provided on the inner surface of the opening part 1a of a cap 1. When a lead is abraded by writing, a push-out piece 7 may be pushed forwardly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for making the tip writing part of a cursive body appear and disappear from an opening of the main body by manual operation, or when the cursive body is an internal mechanism of a mechanical pencil. This invention relates to a push-out writing instrument whose lead can be fed out by manual operation.

Therefore, the present invention can be widely used as a replacement for conventional writing instruments having knock-type, rotary-type, etc. tip writing mechanism and lead feeding mechanism.

[Conventional technology and its problems]

BACKGROUND ART Conventionally, writing instruments in which the tip writing part of a cursive body protrudes and retracts from an opening in a main body have been developed and become popular, such as those that knock the rear end and those that relatively rotate the front and rear parts of the main body.

In addition, there are mechanical pencils that can make the tip of the writing part appear and disappear and the lead can be fed out, such as so-called double-knock mechanical pencils that make the tip of the writing part come out and go with a large knock and feed out the lead with a small knock. A so-called rotary knock-type mechanical pencil has been developed and is commercially available, in which the front and rear parts are rotated relative to each other to cause the tip writing part to appear and retract, and the rear end is knocked to feed out the lead.

However, all of these devices are cumbersome to operate because, after holding the main body when writing, you have to switch hands and knock or rotate the device using both hands.

In addition, in the case of mechanical pencils, double-knock type mechanical pencils require careful handling to produce a large knock and a small knock, and there is also the problem that a large knock when built-in causes the lead to be drawn out unnecessarily. The rotary knock type is cumbersome because you have to operate both the rotation and the knock.

[Problem to be solved by the invention]

The present invention solves the problems of the above-mentioned conventional techniques, and makes it possible to make the tip writing part of the writing body appear and disappear from the opening of the main body, and when the writing body is an internal mechanism of a mechanical pencil, the lead can be repeated. An object of the present invention is to provide a push-out writing instrument that can be taken out by hand while holding the main body when writing.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has an opening (usually provided at the front end, but provided at both ends when a double-ended writing instrument such as a compound writing instrument or a two-color writing instrument is used) through which the tip writing part of the writing instrument appears. A main body having a main body, a writing body housed in the main body while being constantly biased in a backward (built-in) direction by a compression spring, a tension spring, etc., and the writing body (including a part of the writing body and a member that interlocks with the writing body) a push-out piece connected to the main body and placed within a range that can be operated with one finger (thumb or index finger) on the outside of the main body while holding the main body when writing; and as the push-out piece moves forward, the writing The writing body is characterized by being provided with a means for automatically locking the writing body to the main body when the body advances to a position where writing is possible, and releasing the lock by pushing a lock release body in the radial direction by manual operation. There is.

The cursive writing is based on the mechanical pencil's internal mechanism (generally referred to as the "structure", including the internal cap, lead holder,
Chucks, fasteners, fastener receivers, chuck springs,
(consisting of a core case, etc.), the force of the built-in spring that always urges the internal mechanism of the core in the backward direction is weaker than the force of the chuck spring, and the force of the chuck spring is determined by the relationship between the force of the built-in spring and the force described later. (must be stronger than the sum of the frictional force between the stopper and the main body), connects the rear part of the chuck (including the joint pipe and core case) and the extruded piece, and fastener receiver (interlocks with the fastener receiver). (including parts)
and the main body, and when the internal mechanism moves forward and automatically locks in the writable position, the stepped portion of the front part of the internal cap is on the inner surface of the opening of the main body. It is configured so that they almost touch each other.

In addition, when the cursive writing is a ballpoint pen refill (regardless of shape and size, oil-based or water-based), a member that interlocks with the refill (which may be integrated with the refill or separate) and the The locking and locking means is provided between the interlocking member and the main body.

Furthermore, the locking and locking release means may be arranged on the cursive side (
A locking piece (including one that opens with its own blade) that is always urged to open outward is provided on the internal mechanism of a mechanical pencil (such as a fastener holder in a mechanical pencil or an interlocking member in a ballpoint pen), and a locking piece that engages with the locking piece is provided on the main body side. A locking portion that fits is provided, and the locking is automatically performed when the two engage, and the locking is released by pushing the locking release body provided on the main body side in the radial direction with one finger. It consists of

[For production]

By having the present invention configured as described above, when writing, while holding the main body, one finger (thumb or index finger) is moved (retracted) to a position where the push-out piece can be pushed out.
Next, when the extruded piece is moved forward, since the extruded piece is connected to the writing body, the writing body also moves forward as the extruded piece moves forward. In addition, since a locking piece is provided on the writing body side that is always biased to open outward, the locking piece moves forward as the extrusion piece and the writing body move forward while elastically contacting the inner surface of the main body. When the tip writing part 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 part provided on the main body.

When the writing body is an internal mechanism of a mechanical pencil, the force of the chuck spring is stronger than the sum of the force of the built-in splinter and the frictional resistance force between the locking piece and the inner surface of the main body, so the chuck spring does not contract and the built-in spring The internal mechanism moves forward by contracting only that part.

Then, a locking piece provided on the fastener receiver or a member interlocking with the fastener receiver engages with a locking portion provided on the main body, and the internal mechanism is automatically locked in the writable position. When writing in this state, the pressure of the pen is received by the main body via the fastener holder, and the lead does not slip inside the chuck.

When the core protruding from the tip of the internal mouthpiece is worn out and it is desired to feed it out, the push-out piece in the forward position can be pushed further forward. Since the extrusion piece is connected to the rear part of the chuck, and the internal mouthpiece cannot move forward because the stepped part of the front part substantially contacts the inner surface of the opening of the main body, the chuck moves forward by compressing the chuck spring. In other words, the extruded piece is pushed out against the force of the chuck spring, but
The chuck spring is as strong as that of a normal knock-type mechanical pencil (mechanical pencils that receive pressure from the lead case have a stronger chuck spring to prevent the lead from slipping), so the extrusion The force for pushing out the pieces does not need to be so strong.

The above-mentioned action in which the lead is drawn out when the push-out piece is further pushed out when the internal mechanism of the mechanical pencil is in the forward writing position is the same as the action in which the lead is drawn out when the rear end of a knock-type mechanical pencil is knocked. Since it is the same as , the explanation will be omitted.

When the writing body is locked in the writable position, the unlocking body provided on the main body is slightly raised from the outer circumferential surface of the main body. Simply move your body with one finger and push in the radial direction. The engagement between the locking piece and the locking portion is disengaged, and the writing body moves backward by the force of the built-in spring. The force of the built-in spring is weak enough to keep the writing body in the built-in state, that is, to the extent that the tip writing part does not stick out from the opening of the main body even when you run with it or run down the stairs. It's good, so the impact when the cursive character retreats is not strong. The cursive font may stop when a part of it hits a step inside the main body, or it stops when it hits the leg of an extruded piece or the rear end of a slit in the main body, or the rear end of a member that interlocks with the cursive font stops when it hits a step inside the main body. It may hit the inner surface and stop, resulting in a built-in state.

In addition, when the writing body is a refill for a ballpoint pen, it is only necessary to move the tip of the writing part forward to a writable position, and there is no need to configure the push-out piece so that it can move forward.

Moreover, it is not always necessary to press the unlocking body in the radial direction with a finger, and the push-out piece may be retreated and sunk (pushed in the radial direction).

〔Example〕

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

1 to 7 are diagrams showing a first embodiment of the present invention,
The cursive writing is the internal mechanism of a mechanical pencil.

FIG. 1 is a front view when the writing body is in the built-in state, FIG. 2 is a side sectional view in the state shown in FIG. 1, and FIG. 3 is a side sectional view when the writing body is in the writable position.

In the figure, 1 is a base having an opening 1a at its front end. A stepped portion 1b is provided on the inner surface of the opening portion 1a, so that a stepped portion of an internal cap, which will be described later, comes into contact with it. Also,
A slight horizontal part is provided at the rear end of the tapered part, and the rear part (to the right in the figure) is a horizontal small diameter part, and a male thread is cut in this part. The cap 1 is made of metal, synthetic resin, or the like.

Reference numeral 2 denotes a front shaft cylinder, and a female thread is cut on the inner surface of the front end portion. Furthermore, the inner surface of the rear end portion has a large diameter. Front shaft cylinder 2
has a circular cross section, but the portion where the extruded piece described below moves back and forth is a recess 2a, and the recess 2a is a horizontal surface. Furthermore, a slit 2b is provided approximately at the center of the recess 2a, through which the foot of an extruded piece to be described later passes. An unlocking body 2C having a width slightly narrower than the width of the recess 2a is connected to the rear portion of the recess 2a. The unlocking body 2c is provided so as to be swingable in the radial direction, and has a substantially circular projection 2d at the rear end. Since the front barrel 2 is a part to be held by the fingers when writing, most of the outer surface (excluding the recess 2a) is provided with knurling 2e for holding the fingers. A --shaped slit 2f is cut in the front shaft cylinder 2 behind the portion that serves as the front fulcrum of the unlocking body 2c, all the way to the rear end. Note that the rear end of the unlocking body 2C is connected to the front shaft cylinder 2.
It is slightly shorter than the rear end.

FIG. 6 shows a structure in which the male screw at the rear end of the base 1 described above is screwed into the female screw at the front end of the front shaft cylinder 2.

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

The small diameter portion of the front end portion of the rear shaft tube 3 is press-fitted into the large diameter portion of the inner surface of the rear end portion of the front shaft tube 2 described above so that the slit coincides with the slit 2f of the front shaft tube 2. The base 1, the front barrel 2, and the rear barrel 3 form the main body.

Next, a long oval extruded piece 7 is prepared, but the extruded piece 7
is provided with a knurling 7a on the top surface for finger rest.

Further, a leg 7b is vertically provided approximately at the center of the extruded piece 7, and a donut-shaped receiving portion 7c is provided on the leg 7b. These three parts are integrally molded, and the state seen from the front is shown in FIG.

Next, the internal mechanism of a mechanical pencil, which is a cursive writing instrument, will be explained.

Reference numeral 8 denotes an internal cap, and the small diameter portion 8a at the tip is similar to the cap l described above.
The opening 1a is made to appear and disappear.

A step portion 8b is provided at the rear end of the small diameter portion 8a, and the portion behind the step portion 8b is tapered and the rear end is a horizontal portion.

A female thread is cut on the inner surface of this horizontal part. Further, a core pipe 9 is press-fitted into the small-diameter tip portion 8a of the internal cap 8. Behind it, a lead holder 10 that is made of an elastic material such as rubber and that always holds the lead with a certain amount of force is attached to the internal cap 8.
It is press-fitted from the rear.

Next, a fastener receiver 11 is prepared, and a male thread is cut on the outer periphery of the tip portion of the fastener receiver 11. The rear end portion of the male screw has a large diameter portion, and a flange portion 11a is provided on the outer periphery of the front end of the large diameter portion. Further, a protruding edge 11b is provided on the circumference of the center portion of the dowel. This protruding edge 11b prevents the fastener described later from retreating, and at the same time serves as a spring stop. Press fit the cylindrical body 11c into the fastener receiver 11,
The front end of the cylindrical body 11c is in contact with the flange 11a. The cylindrical body 11c is provided with a single slit lid, and this slit 11d is also similar to the slit 2b of the front shaft cylinder 2 described above.
Similarly, the legs 7b of the extruded piece 7 are made to pass through.

Further, the cylindrical body 11c is provided with a locking piece lie behind the slit lid. This locking piece lie is made of a molded product integral with the cylindrical body 11c so as to always open outward (see FIG. 5). A projection I on the outer surface of the rear end of the locking piece 11e
ff is provided, but the rear end of the projection 11f is slightly shorter than the rear end of the cylindrical body 11c.

Next, in the front part of the protrusion 11b in the fastener receiver ll,
Fit the fastener 12 and chuck 13. The fastener 12 is
It is loosely fitted so as to slide between the stepped portion 8C on the inner surface of the internal cap 8 and the protrusion 11b. Also, chuck 13 is divided into three parts,
The head, such as the splitter, has an expanding force, and is designed to clamp and release the core 14 by engaging and disengaging the fastener 12 (Figures 2 and 3 show the state in which the core is clamped). , FIG. 4 shows the state in which the core is released). A lead case 15 is connected to the rear of the chuck 13, and a spare lead is placed inside the lead case 15. The front end of the inner surface of the lead case is tapered and serves as a lead guide for feeding the leads in the lead case 15 into the chuck 13 one by one. A collar portion 15a is also provided on the outer periphery of the front end of the core case 15.

The front end surface of the core case 15 and the protruding edge 1 on the inner circumference of the fastener receiver 11
A chuck spring 16 is interposed between 1b.

The internal mechanism of the mechanical pencil is constructed as described above, and in its natural state, as shown in FIGS. 2 and 3, the chuck 13 is fitted with the fastener 12 by the chuck spring 16 to clamp the lead.

Next, a male thread is cut on the outer periphery of the rear end of the core case 15, and after the built-in spring 17 is fitted into the core case 15, a ring 18 with a female thread is screwed into the female thread at the rear end of the core case 15. The built-in spring 17 is provided in a slightly compressed state, with its front end hitting the spring stopper 3b in the rear shaft cylinder 3, and its rear end hitting the ring 18.

The force of the built-in spring 17 is made weaker than the force of the chuck spring 16 described above.

Next, assembly will be explained.

First, the slit 2f of the front barrel 2 and the slit at the front end of the rear barrel 3 are aligned, and the rear barrel 3 is fixed to the front barrel 2 by press fitting, adhesive, 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 and the slit 11d of the cylindrical body 11c are aligned. In this state,
The extruded piece 7, the foot 7b, and the receiver are made by integrally forming the part 7C, so that the part 7C of the receiver is parallel to the slit 2b of the front shaft cylinder 2 (at this time, the extruded piece 7 is perpendicular to the slit 2b). state), into the slit 2b and slit lid.

The receiver is inserted into the extruded piece 7 after the part 7c has entered the cylindrical body 11c.
When is rotated by 90 degrees, the state shown in FIG. 7 is obtained (the extruded piece 7 is housed in a parallel state within the recess 2a).

Next, the fastener receiver II, the fastener 12, the chuck 13,
The assembled chuck spring 6 and core case 5 are inserted from the front of the donut-shaped receiver part 7c, and the fastener receiver 11 is press-fitted into the front part of the cylindrical body 11c.

Next, the built-in spring 17 is dropped into the rear shaft cylinder 3 from the rear of the core case 15, and the ring 18 is screwed onto the rear end of the core case 15 while the built-in spring 17 is slightly compressed.

Fit the eraser 5 with the cleaner pin 4 inserted into the rear end of the rear barrel 3. Next, the internal cap 8 having the core pipe 9 and the core holder 10 is screwed into the fastener receiver 11. Finally, when the base l is screwed onto the front shaft cylinder 2, the state shown in FIGS. 1 and 2 is assembled.

The operation of the first embodiment is as follows.

If you hold the main body with the writing body built in as shown in FIGS. 1 and 2 and move one finger (for example, your thumb) backward to advance the push-out piece 7, the foot 7b and the receiver will move through the part 7c. The collar portion 15a of the core case 15 is moved forward. At this time, the force of the chuck spring 16 is stronger 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 the chuck spring 16 does not contract. The built-in spring 17 is compressed to move the entire internal mechanism forward. When the rear end of the locking piece 11e reaches the rear end of the slit 2f of the main body, the locking piece Lie moves into the slit 2f.
It will fit inside f, resulting in the state shown in Fig. 3. That is, at the writable position where the stepped portion 8b of the front portion of the internal cap 8 almost contacts the stepped portion 1b on the inner surface of the opening 1a of the cap 1, the internal mechanism is engaged with the engaging portion 3a of the main body via the locking piece 11e. to lock.

If you write in this state and the lead protruding from the tip of the lead pipe 9 wears out, you can push the push-out piece 7 further forward in the state shown in FIG. The step 8b of the internal cap 8 immediately contacts the step 8b on the inner surface of the opening 1a of the cap 1, and the internal cap 8, fastener receiver 11°, and cylindrical body 11c cannot move forward. Then, the chuck spring 16 is compressed (the built-in spring is also compressed at the same time), and the core case 15 and chuck 13 move forward. The distance l shown in FIG.
are fitted and move forward while holding the core 14, so the core is let out by a length l from the tip of the core pipe 9, as shown in FIG. Expand and release the core. When the push-out piece 7 is released, the chuck 13 and the fastener 12 are retracted by the force of the chuck spring 16, and are fitted together again to clamp the lead 14 (ready for writing).

The action of drawing out a fixed length of lead each time the lead case moves forward is the same as that of a normal knock-type mechanical pencil.

After writing, in order to retract the core pipe 9 protruding from the opening of the cap I and the small diameter portion 8a at the tip of the internal cap 8 into the main body, use one finger to pull the core pipe 9 protruding from the opening of the cap I in the state shown in FIG. It is sufficient to push the protrusion 2d at the rear end of the unlocking body 2c in the radial direction. The rear end of the locking release body 2c presses the protrusion 11f of the locking piece 11e, so that it is unlatched from the engaging part 3a, and the locking piece lie retreats by the force of the built-in spring 17, returning to the state shown in FIG. 2. .

Next, a second embodiment of the present invention will be described with reference to FIGS. 8 to 11. The cursive font of the second embodiment is used as a refill for a ballpoint pen.

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

Figure 8 is a cross-sectional view of the cursive font when it is in the built-in state;
The figure is a cross-sectional view when the cursive body is in a writable position.

In the figure, l is a cap and has an opening 1a at its front end. Further, the rear part (to the right in the figure) of the tapered part is a horizontal part, and a female thread is cut on the inner surface of the horizontal part. 22
is a shaft cylinder, and a male thread is cut on the outer periphery of the small diameter portion at the tip. Although the shaft cylinder 22 has a circular cross section, the portion where the extrusion piece 7 moves back and forth is a recess 22a, and the recess 22a is a horizontal surface.

A slit 22b, through which the leg 7b of the extrusion piece 7 passes, is provided approximately in the center of the recess 22a. An unlocking body 22c having a width slightly narrower than the width of the recess 22a is provided at the rear part of the recess 22a.
is provided to be swingable in the radial direction. Lock release body 22c
is a thin-walled molded product, and it will sink in the radial direction just by applying a light force. A slit 22g having the same width as the recessed part 22a is also provided in this sunken part, and the rear end of the slit is connected to the engaging part 22h.
It is said that At the rear end of the unlocking body 22c, a raised part 22d having a rounded shape at the front and rear is formed, and a protrusion 22i is provided on the back surface of the raised part 22d. The part of the barrel 22 that is held by the fingers during writing is provided with a knurling 22e for holding the fingers, except for the recess 22a. A female thread is cut on the inner periphery of the shaft cylinder 22 near the rear end opening, into which a male thread of the tail plug 19 with a clip is screwed.

The base 1, the shaft tube 22, and the tail plug 19 form a main body.

Next, prepare the extruded piece 7 with the knurling 7a on the top surface, the legs 7b of the extruded piece, and the receiver part 7c.
Since it is similar to the embodiment, the explanation will be omitted.

Next, a refill case 20 is prepared. refill case 2
0 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 collar 22a is provided on the outer periphery of the front part, and this collar 20a is attached to the receiving part 7.
I am trying to make sure that C receives it.

A notch 20b is provided in the front part of the refill case 20,
A locking piece 20c molded so as to open outward at all times is integrally attached to this notch 20b. The rear end of the locking piece 20c has a rounded protrusion @20d in the front and rear. The front part of this refill case is shown in FIG.

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

The above writing instrument is assembled as follows.

First, the tail plug 19 is screwed onto the rear end of the shaft cylinder 22. Next, in the same manner as in the first embodiment, the extruded piece 7, the leg 7b, and the receiver part 7C.
pass through the slit 22b of the shaft cylinder, and the receiver connects the part 7c to the shaft cylinder 2.
Put it within 2. Next, the refill case 20 is inserted through the front end opening of the shaft tube 22, and the collar 20a is received by the receiving part 7C. At this time, since the protrusion 20d of the locking piece 20c is rounded at the upper rear end, the donut-shaped receiver extends inside the portion 7c.
It passes through with the locking piece 20c 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 shaft cylinder 22. The assembly is now complete, and the state shown in FIG. 8 can be obtained. In addition, when the push-out piece 7 is pulled in the backward direction with a finger in the state shown in FIG. 8, the unlocking body 22c and the raised portion 22d sink in the radial direction until the foot 7b hits the rear end of the slit 22b, or the push-out piece 7 is pushed out. The push-out piece can be retracted until the rear end of the piece 7 hits the engaging portion 22h.

Next, the effect will be explained.

In the refill built-in state shown in FIG. 8, when the push-out piece 7 is pushed forward by hand operation, the foot 7b and the receiver are 7C1 and the collar 20a1.
The refill 21 advances through the refill case 20 to the writable position shown in FIG. 9 while compressing the built-in spring 17. At this time, the locking piece 20c also moves forward together with the refill case 20, with the protrusion 20d elastically contacting the inner surface of the shaft tube 22, and the rear end of the locking piece 20C becomes a sleeve) 22g.
The locking piece 20C engages and locks the engaging portion 22h.

Writing is done in this state, and when the writing is finished, the push-out piece 7 is moved back to - by hand operation. The rear portion of the push-out piece 7 pushes the unlocking body 22c in the radial direction via the raised portion 22d, so that the lock is released from the state shown in FIG. Both move back and return to the built-in state shown in FIG.

Although the above two embodiments have been described, the present invention is not limited to these embodiments. For example, in a case where the writing body is an internal mechanism of a mechanical pencil, the front barrel 2 and the rear barrel 3 may be integrally molded. How to install the locking release bodies 2c, 22c and the locking pieces 20c
You can set it up as you like. Extrusion piece 7, leg 7b, receiver part 7
The shape and installation of C may be arbitrary. In addition, integration of parts and design changes are free.

〔Effect of the invention〕

As explained above, according to the present invention, the following effects are achieved.

(i) While holding the main body, the writing tip can be moved in and out of the opening of the main body by hand operation with one finger, and when the writing body is an internal mechanism of a mechanical pencil, the lead can be extended. It is easy to use because it can be done by hand.

(ii) Since the main body receives the pressure of the pen when writing, in the case of a mechanical pencil, the lead does not slip even if the force of the chuck spring is not particularly strong. In addition, since the force of the chuck spring is not particularly strong, the force for pushing the extrusion piece when feeding out the core can be reduced.

(in) Since there are not many parts and it is easy to assemble, it can be provided at low cost.

[Brief explanation of drawings]

1 to 7 show a first embodiment of the push-out writing instrument of the present invention, in which FIG. 1 is a front view showing the built-in state of the writing body, FIG. 2 is a side sectional view thereof, and FIG. 4 is a side sectional view showing the state in which the writing body is locked in the writable position, FIG. 4 is a side sectional view showing the state when the lead is drawn out and the chuck releases the grip of the lead, and FIGS. 5 and 6 7 is an enlarged perspective view of the main part, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 1, FIGS. 8 to 11 show the second embodiment, and FIG. FIG. 9 is a cross-sectional view showing a writable state; FIG.
11 are enlarged perspective views of main parts. l...cap, 1a...opening, lb...step, 2
...Front shaft cylinder, 2a...Concave portion, 2b...Slit, 2C...Latch release body, 2d...Protrusion, 2e...
Knurling, 2f...slit, 3...rear shaft cylinder,
3a...engaging portion, 3b...spring stop, 4...
・Cleaner pin, 5... Eraser, 6... Clip, 7... Extruded piece, 7a... Knurling, 7b...
・Foot, 7c...Bake is part, 8...Internal cap, 8a...
・Tip small diameter part, 8b...stepped part, 8c...inner step part, 9...core pipe, 10...core holder, 11...
Fastener receiver, lla...flange, llb...flange, l
lc...cylindrical body, lid...slit, 11e...
・Locking piece, llf...Protrusion, 12...Fastener, 13
...Chuck, 14... Core, 15... Core case,
15a... Flange portion, 16... Chuck spring, 1
7...Built-in spring, 18...Ring, 19...
・Tail plug, 20... Refill case, 20a... Tsuba,
20b... Notch, 20c... Locking piece, 20d...
・Protrusion, 21... Refill, 22... Shaft cylinder, 22a
... recess, 22b... slit, 22c... lock release body, 22d... raised portion, 22e... knurling, 22g... slit, 22h... engaging portion, 22i
···protrusion.

Claims (1)

[Scope of Claims] 1. A main body having an opening through which a writing part at the tip of the writing body appears, a writing body housed in the main body while being constantly biased in a backward direction, connected to the writing body, and A push-out piece is placed within a range that can be operated with one finger on the outside of the main body while holding the main body during writing, and when the writing body advances to a writable position as the push-out piece moves forward. A push-out type writing instrument, characterized in that it is provided with means for automatically locking the body to the main body, and releasing the lock by pushing the lock release body in the radial direction by manual operation. 2. The cursive writing is an internal mechanism of a mechanical pencil,
The force of the built-in spring that always urges the internal mechanism in the backward direction is made weaker than the force of the chuck spring, and the rear part of the chuck and the push-out piece are connected, and the locking and A lock release means is provided, and when the internal mechanism moves forward and automatically locks in the writable position, the stepped portion of the front portion of the internal cap substantially contacts the inner surface of the opening of the main body. Claim 1
The push-out writing instrument described. 3. The writing body is a refill for a ballpoint pen, a member that interlocks with the refill and the extrusion piece are connected, and the locking and unlatching means is provided between the interlocking member and the main body. The push-out writing instrument according to claim 1, wherein: 4. The locking and locking release means is on the cursive side,
A locking piece that is always urged to open outward is provided, a locking portion that engages with the locking piece is provided on the main body side, and locking is automatically performed by engagement of both, and the main body side 4. The push-out type writing instrument according to claim 1, wherein the push-out writing instrument is configured to release the lock by manually pushing the lock release body provided in the holder in the radial direction with one finger.