JP2023128627A - Retractable writing instrument - Google Patents

Abstract

To push out a lead by a rotation operation of a barrel or a tip side base part.SOLUTION: A retractable writing instrument includes: a tip side base part 10; and a barrel 20 which is rotatably connected to the rear side of the tip side base part 10 and in which a lead x is stored. The retractable writing instrument is configured to push out the lead x forward from the tip side base part 10 by rotation of the barrel 20 relative to the tip side base part 10. An outer periphery part of the tip side base part 10 is provided with an engaged part 11a for the rotational operation.SELECTED DRAWING: Figure 4

Description

The present invention relates to a drawing-out writing instrument in which a lead stored in a barrel is drawn out.

Conventionally, this type of invention has been proposed, for example, as described in Patent Document 1, a cylindrical cap part, a middle cylinder part connected to the rear side of the cap part, and a rear end side of the middle cylinder part. By rotating the rotating cylinder part, the internal rotating shaft is rotated and moved forward, and the core connected to the front end of the rotating shaft is connected to the core at the front end of the cap part. Some are made to protrude from the extrusion port.

Utility model registration No. 3101275

In the above-mentioned conventional technology, since the rotary cylinder part partially exposed on the rear side of the middle cylinder part (rear shaft) is rotated, it is difficult to grasp the rotary cylinder part during operation, making it difficult and difficult to operate. Ta.

In view of such problems, the present invention includes the following configuration.
It includes a tip side base, and a barrel that is rotatably connected to the rear side of the tip base and houses a core, and the core is moved to the tip base by rotation of the barrel opposite to the tip base. What is claimed is: 1. A drawing-out writing instrument, which is configured to be drawn out forward from the tip, and has an engaged portion for rotational operation provided on the outer circumferential portion of the tip side base.

Since the present invention is configured as described above, the core can be fed out by rotating the shaft tube or the tip side base, and the operability is good.

FIG. 2 is a longitudinal cross-sectional view showing an example of a writing instrument with a sharpener that includes a writing instrument and a sharpener. It is an exploded view of the writing section, each showing a longitudinal section. It is an exploded view of the sharpener part, each showing a longitudinal section. These are longitudinal cross-sectional views of the writing instrument, in which (a) is a state in which the lead does not protrude, (b) is a state in which the barrel is rotated and the lead is drawn out, and (c) is a state in which the barrel is rotated and the advancing/retracting member is moved. Indicates the state of movement to the forward limit position. In addition, in this figure, the hatched portion of the cross section indicates a stationary portion, and the hatched portion indicates a portion rotated or moved forward relative to the stationary portion. It is a longitudinal cross-sectional view showing a state in the middle of inserting the front end side portion of the writing instrument into the sharpener. It is a vertical cross-sectional view showing the front end side of the writing instrument and the sharpener, in which (a) shows a state in which the writing instrument with no protruding lead is fitted into the sharpener, and (b) shows a state in which the barrel is rotated to sharpen the lead. (c) shows a state in which the shaft cylinder is in contact with the regulating portion, and (c) shows a state in which the engaged portion is disengaged from the engaging portion by further rotating the shaft cylinder. In addition, in this figure, the hatched portion of the cross section indicates a stationary portion, and the hatched portion indicates a portion rotated or moved forward relative to the stationary portion.

This embodiment discloses the following features.
The first feature is that the drawing instrument is equipped with a dispensing base, and a barrel rotatably connected to the rear side of the distal base and housing a lead, and the dispensing writing instrument is provided with the dispensing base disposed opposite to the distal base. The core is moved forward from the distal base by rotation of the barrel, and an engaged portion for rotational operation is provided on the outer periphery of the distal base (see FIG. 4).

As a second feature, the engaged portion is formed in a concave shape with openings at the front and the outside in the radial direction (see FIGS. 1 and 2 to 6).

As a third feature, a spiral groove is integrally provided on the inner circumferential surface of the barrel in the front-rear direction, and a spiral groove is provided at the rear of the tip side base portion, and a spiral groove is provided on the inner peripheral surface of the barrel, and a spiral groove is provided at the rear of the tip side base portion. A core is integrally provided, the core is provided with a guide hole extending in the front-rear direction and passing through in the radial direction, and a core holding member is non-rotatably fitted on the rear end side of the core, The core holding member is inserted into the guide hole and fitted into the spiral groove (see FIGS. 1, 2, and 4).

As a fourth feature, the spiral groove is provided on the inner circumferential surface of a feed screw member fixed to the inner circumferential surface of the shaft cylinder (see FIG. 2).

As a fifth feature, the feed screw member is configured in a cylindrical shape with one half and the other half separated in the radial direction, and the one half and the other half are members of the same shape, and are arranged in front and behind each other. are combined in such a way that they are reversed (see Figure 2).

A sixth feature is a reciprocating member that is inserted into the guide hole on the rear side of the core holding member and fits into the spiral groove, and an urging member that urges the retractable member rearwardly with respect to the core holding member. The advancing/retracting member is provided with a pushing part that is inserted into the core holding member from the rear side and approaches or contacts the rear end of the core, so that the core holding member and the advancing/retracting member move forward together. At this time, the core holding member became unable to move forward, and the reciprocating member further moved forward, so that the core was pushed forward by the pushing portion of the advancing retractable member (see FIG. 4).

As a seventh feature, when the reciprocating member advances to the front end side of the core, it is not engaged with the feed screw member (see FIG. 4).

<First embodiment>
Next, a specific embodiment having the above characteristics will be described in detail based on the drawings.
In this specification, the axial direction of the barrel means the direction in which the center line of the barrel extends, and the circumferential direction of the barrel means the direction around the center line of the barrel. Further, the term "front" refers to one side in the axial direction of the barrel, in which the front end of the refill protrudes, and the term "rear" refers to the opposite side to the one side.
Further, in this specification, the radial direction of the barrel means the diametric direction of the barrel perpendicular to the center line of the barrel. The outer side in the radial direction of the barrel means the direction away from the center of the barrel along the radial direction of the barrel, and the inner side in the radial direction of the barrel means the direction toward the center of the barrel along the radial direction of the barrel.

A writing instrument with a sharpener A shown in FIG. 1 includes a feeding writing instrument 1 that feeds out the internal lead x forward, and a lead sharpener 2 that sharpens the lead x that is fed out from the feeding writing instrument 1.

The core x is a relatively thick lead core. For example, a lead lead for colored pencils can be used as the lead x.

In the feeding writing instrument 1, the lead inside the barrel is fed forward from the front base by rotating the rear barrel facing the front base (see FIG. 4).
To explain in detail, this feeding writing instrument 1 has a tip base 10 exposed on the most distal side, and a shaft tube that is coaxially connected to the rear side of the tip base 10 and that houses a lead x. 20, a cylindrical feed screw member 30 that is fixed to the inner circumferential surface of the shaft cylinder 20 in a manner that cannot move forward or backward and cannot rotate; and a feed screw member 30 that is connected to the rear end side of the core It includes a core holding member 40 that moves forward and backward while meshing with each other, a moving member 50 that moves forward and backward while meshing with the spiral groove 30a on the rear side of the core holding member 40, and an urging member 60 that urges the moving member 50 backward (FIG. 1 and Figure 2).

The distal base 10 includes a rotary operating section 11 that protrudes forward from the distal base 10, and a core that protrudes rearward from the rear end of the rotary operating section 11 and continues in the front-rear direction over substantially the entire length within the shaft tube 20. 12 are integrated.

The rotation operation part 11 is a cylindrical member into which the core x is inserted so as to be movable forward and backward, and has an outer circumferential surface formed into a substantially conical shape whose diameter decreases toward the front. The rotation operation section 11 is fitted into the inner circumferential surface of the front end side of the shaft tube 20 so as to be rotatable but not capable of moving forward or backward.

An engaged portion 11a is provided on the outer peripheral surface of the rotational operation portion 11 for rotational operation using fingers of a hand, a jig, a core sharpener 2, etc. to be described later.
A plurality of engaged parts 11a are provided at intervals in the circumferential direction of the rotation operation part 11. Each engaged portion 11a is formed in a concave shape with an open front and radially outer side.

The core 12 is a long, substantially cylindrical member. In the figure, the guide holes 12a, 12b are elongated holes that radially penetrate the peripheral wall of the core 12 in the front-rear direction.

The guide holes 12a and 12b are provided so that the core holding member 40 and the reciprocating member 50 are inserted therethrough.

The shaft cylinder 20 is a long member with an open front end, covers the core 12 over its entire length in a cylindrical shape, and rotates coaxially with respect to the rear end side of the rotary operation section 11 .
The outer peripheral surface on the front end side and the outer peripheral surface on the rear end side of the shaft tube 20 are respectively formed so that a core sharpener 2, which will be described later, can be inserted into and removed from them.
The rib 21 in the barrel 20 fixes the feed screw member 30 to the barrel 20 in a non-rotatable manner.

The engagement recesses 22 and 24 are annular engagement recesses into which the protrusion 73 in the core sharpener 2 is removably fitted. In addition, in a state in which the protrusion 73 inside the lead sharpener 2 is fitted into the front engaging recess 22, the shaft cylinder 20 is rotatable relative to the main body case 70 of the lead sharpener 2.

The feed screw member 30 is configured in a cylindrical shape with one half 31 and the other half 32 separated in the radial direction.
The one-half portion 31 is an elongated member having an arc-shaped cross section continuous in the front-rear direction, and has a spiral groove 30a on the inner circumferential surface.
The other half 32 is a common part having the same shape as the one half 31, and has a spiral groove 30a on its inner peripheral surface.

The one half part 31 and the other half part 32 are opposed to each other with the rib 21 mentioned above in between, and are combined in the radial direction so that the front and back are reversed, and are integrated with the shaft cylinder 20, so that the inner circumferential surface thereof , a spiral groove 30a is formed.

The marks 31b and 32b are for distinguishing between the one half 31 and the other half 32 in the front-rear direction. According to the illustrated example, these marks 31b and 32b are notches provided at each end of the one half 31 and the other half 32, but as other examples, they may be protrusions, printed marks, etc. It is also possible.

The core holding member 40 is a long cylindrical member. The front end of the core holding member 40 is pressed against the rear end of the core x to hold the core x non-rotatably.
The core holding member 40 is inserted into the guide holes 12a, 12b of the core 12 and screwed into the helical groove 30a on the outer circumferential surface of the core holding member 40, respectively.

The reciprocating member 50 is a shaft-shaped member that is inserted into the core holding member 40 from the rear side, and has a pushing portion on its front end that approaches or contacts the rear end of the core x fitted into the lead holding member 40. It has 51.
Further, a screw engagement portion 52 is provided on the rear end side of the reciprocating member 50 so as to be inserted into the guide hole 12a of the core 12 and screwed into the spiral groove 30a.

Further, the biasing member 60 is a compression coil spring according to the illustrated example, and is attached to the reciprocating member 50 in an annular manner and inserted into the core holding member 40 . This biasing member 60 biases the reciprocating member 50 rearward with respect to the core holding member 40.

Next, the configuration of the core sharpener 2 will be explained.
The lead sharpener 2 constitutes a cap that is removably attached to the front end side of the feeding writing instrument 1.
To explain in detail, this lead sharpener 2 includes a cylindrical main body case 70 that can be fitted onto the front end side of the feeding writing instrument 1, and a closing member 80 attached to a lead sharpening outlet 71 at the front end of the main body case 70. , a cutting blade unit 90 fixed in the main body case 70 on the rear side of the closing member 80 , an elastic insertion part 100 that covers the rear end opening of the cutting blade unit 90 , and a front and rear part on the rear side of the elastic insertion part 100 . It includes a movable but non-rotatable receiving part 110 and a biasing member 120 that urges the receiving part 110 rearward with respect to the cutting blade unit 90 and the elastic insertion part 100 (see FIGS. 1 and 3).

The main body case 70 has an opening at the front end as a core removal port 71, and an opening at the rear end as an insertion port 72 for the feeding writing instrument 1 (see FIG. 3).
The inner circumferential surface of the main body case 70 near the insertion port 72 is removably and rotatably fitted to the outer circumferential surface of the front end side of the shaft tube 20.

The core sharpener 2 can be mounted on the front end side of the shaft tube 20 by making the protrusion 73 go over the engagement recess 22, and can be attached to the rear end side of the shaft tube 20 by making the protrusion 73 go over the engagement recess 24. It can also be installed.

The annular inclined surface 74 is formed in a tapered shape in contact with the inclined surface on the front end side of the shaft tube 20 to restrict forward movement of the shaft tube 20 with respect to the main body case 70.
The guide portion 75 protrudes from the inner circumferential surface of the main body case 70 and extends in the front-rear direction, and fixes the cutting blade unit 90 non-rotatably, and makes the receiving portion 110 movable back and forth but non-rotatable.
The annular projection 76 restricts forward movement of the receiving portion 110.

The closing member 80 includes a cylindrical portion 81 that is fitted and fixed to the cored discharge port 71 of the main body case 70, a substantially disc-shaped lid portion 82 that releasably closes the opening of the cylindrical portion 81, and a lid portion 82 of the lid portion 82. The connecting portion 83 connects the outer peripheral side to the cylindrical portion 81 (see FIG. 3).
According to this closing member 80, the lid part 82 rotates so as to bend the connecting part 83.

The cutting blade unit 90 is integrally composed of a cutting blade 91 that cuts the core x that is fed out from the drawing writing instrument 1 and rotates, and a support base 92 that supports this cutting blade (see FIG. 3).

The cutting blade 91 is a long member having a cutting edge capable of cutting the core x, and is made of metal, ceramic, or the like.
This cutting blade 91 is fixed to a support base 92 with the cutting edge inclined so as to approach the center of the core x as it goes forward. This fixing means can be formed by fitting, adhesion, screwing, insert molding, or the like.

The support base 92 includes an insertion opening 92a into which the lead x is inserted, a lead holding portion 92b that slides on the outer peripheral surface of the lead x that rotates while being cut by the cutting blade 91, and a lead x that moves forward while being cut by the cutting blade 91. It integrally includes a regulating portion 92c that receives core chips from the front side and restricts the advance of the core x, and a discharge path 92d that discharges core chips cut by the cutting blade 91 to the front.
This support base 92 is fixed in a position midway in the front-rear direction inside the main body case 70 so as to be immovable back and forth and unrotatable, so as to secure a core storage chamber 70a on the front side of the cutting blade 91. The core storage chamber 70a is a space between the closed lid part 82 and the cutting blade 91, and stores the core waste scraped by the cutting blade 91.

The insertion port 92a is an opening large enough to allow the core x to be inserted loosely therein. An elastic insertion portion 100, which will be described later, is attached to this insertion port 92a.

The lead holding portion 92b is formed in an inclined shape that approaches the center of the lead x as it goes forward.

The regulating portion 92c has a receiving surface that abuts substantially perpendicularly to the tip of the core x to be shaved by the cutting blade 91 (see FIG. 5).

The elastic insertion portion 100 is made of an elastic material such as rubber or elastomer resin, and is attached to cover the rear end side of the cutting blade unit 90.
Further, the elastic insertion portion 100 is integrally provided with a circular flat elastic membrane 101 having a notch 101a.

The cut 101a is formed in, for example, a slit shape, a cross shape, or a radial shape, and when the core x is inserted, it elastically expands and passes through the core x. In addition, when the core x retreats and separates, it is elastically restored and the penetrating portion is closed to prevent chips from the core x from leaking backward.

The receiving part 110 is a substantially cylindrical member that can move forward and backward by a predetermined amount, and moves forward in response to receiving the distal base part 10 inserted into the main body case 70 (see FIG. 6(c)).
A groove-shaped guided portion (not shown) is provided on the outer circumferential portion of the receiving portion 110 over the entire length in the front-rear direction and fits into the guide portion 75 on the inner circumferential surface of the main body case 70.

A tapered annular inclined surface 111 that fits into the distal base 10 is formed on the inner circumferential surface of the receiving section 110 . An engaging portion 111a that is non-rotatably fitted is provided.

The biasing member 120 is configured such that when the distal base portion 10 rotates while the engaging portion 111a and the engaged portion 11a are engaged, the engaging portion 111a pushes the receiving portion 110 through sliding contact with the engaged portion 11a. The biasing force is appropriately set so as to move it forward and separate it from the engaged portion 11a.

Next, the effects of the feeding writing instrument 1 and the lead sharpener 2 having the above configuration will be explained in detail.
First, the operation of feeding out the lead x by operating the feeding writing instrument 1 alone will be explained along FIGS. 4(a) to 4(c).

In the initial state shown in FIG. 4(a), the distal end of the lead x is located inside the distal base 10, and the lead holding member 40 and the reciprocating member 50 are arranged in the helical direction of the feed screw member 30 at the rear end within the distal base 10. It is screwed into the groove 30a.

In the above initial state, when the barrel 20 is rotated in one direction with the distal base 10 fixed unrotatably, the feed screw member 30 also rotates integrally with the barrel 20, causing the inner surface of the feed screw member 30 to rotate. The spiral groove 30a is in sliding contact with the core holding member 40 and the advancing/retracting member 50.
Therefore, the core holding member 40 and the reciprocating member 50 move forward along the guide holes 12a, 12b, and the lead x also moves forward and protrudes from the distal base 10 (see FIG. 4(b)).

After that, when the shaft tube 20 is further rotated in the one direction, the core holding member 40 and the reciprocating member 50 are also moved further forward. Then, the core holding member 40 comes forward from the spiral groove 30a and comes into contact with the rotational operation part 11, making it impossible to move forward, and only the advance/retreat member 50 moves forward against the biasing force of the biasing member 60 (FIG. 4(c) )reference).
When the reciprocating member 50 advances to the front end side of the feed screw member 30, it is not engaged with the spiral groove 30a of the feed screw member 30, so it does not move forward even if the shaft cylinder 20 is rotated in the one direction. . Therefore, damage to the threaded engagement portion 52 due to excessive rotation of the shaft tube 20 can be prevented.

As only the advancing/retracting member 50 moves forward, the core x is pushed by the pushing part 51 at the tip of the advancing/retracting member 50, and most of the core x is largely exposed forward from the distal base 10.
Therefore, for example, a user or the like can easily remove the core x for replacement or the like.

In addition, if the shaft tube 20 is rotated in the opposite direction with a new lead inserted into the distal base 10 and fitted into the lead holding member 40, the reciprocating member 50 and the lead holding member 40 can be moved in a manner opposite to that described above. This allows you to move backwards.

The operation of inserting the feeding writing instrument 1 into the lead sharpener 2 and feeding out the lead x to sharpen it will be explained along FIG. 6.
In the initial state shown in FIG. 6(a), the dispensing writing instrument 1 with the lead x retracted is inserted into the lead sharpener 2, and the engaged portion 11a on the dispensing writing instrument 1 side is engaged with the lead sharpener 2 side. It is in a state where it is fitted into the portion 111a.

In this initial state, when the barrel 20 is rotated in one direction, the tip x moves forward due to the spiral groove 30a that rotates integrally with the barrel 20 without rotating the tip base 10, and comes into contact with the cutting blade 91. come into contact with

If the barrel 20 continues to rotate, the distal base 10 and the core x will rotate integrally with the barrel 20, and the engaging portion 111a will slide into the receiving portion 110 through sliding contact with the engaged portion 11a. It is moved forward and separated from the engaged portion 11a. Therefore, the core x is cut by the cutting blade 91.

Therefore, according to the feeding writing instrument 1 and the lead sharpener 2 configured as described above, the lead x can be fed out and sharpened by a simple operation.

Further, the present invention is not limited to the embodiments described above, and can be modified as appropriate without changing the gist of the present invention.

1: Feeding writing instrument 2: Lead sharpener 10: Tip side base 11: Rotating operation part 11a: Engaged part 12: Core 12a, 12b: Guide hole 20: Shaft cylinder 30: Feed screw member 30a: Spiral groove 31: One half 32: Other half 40: Core holding member 50: Advance/retreat member 51: Pushing portion 52: Screw engaging portion 60: Biasing member 70: Main body case 70a: Core core storage chamber 71: Core core discharge port 82: Lid part 90: Sharpening blade unit 91: Sharpening blade 92a: Insertion port 92b: Lead holding part 92c: Regulation part 100: Elastic insertion part 110: Receiving part 111a: Engagement part 120: Biasing member A: Writing instrument with sharpener x :core

Claims (7)

It includes a tip side base, and a barrel that is rotatably connected to the rear side of the tip base and houses a core, and the core is moved to the tip base by rotation of the barrel opposite to the tip base. What is claimed is: 1. A drawing-out writing instrument, which is configured to be drawn out forward from the tip, and has an engaged portion for rotational operation provided on the outer circumferential portion of the tip side base. 2. The feeding writing instrument according to claim 1, wherein the engaged portion is formed in a concave shape with an open front and radially outer side. A spiral groove is integrally provided on the inner circumferential surface of the shaft cylinder in the front-rear direction,
A core that continues in the front-rear direction within the shaft cylinder is integrally provided at the rear of the tip side base, and a guide hole that extends in the front-rear direction and penetrates in the radial direction is provided in the core,
A core holding member is non-rotatably fitted to the rear end side of the core,
3. The feeding writing instrument according to claim 1, wherein the lead holding member is inserted into the guide hole and fitted into the spiral groove. 4. The feeding writing instrument according to claim 3, wherein the spiral groove is provided on the inner circumferential surface of a feed screw member fixed to the inner circumferential surface of the barrel. The feed screw member is configured in a cylindrical shape with one half and the other half separated in the radial direction,
5. The feeding writing instrument according to claim 4, wherein the one half part and the other half part are members of the same shape, and are assembled so that the front and back are reversed. a reciprocating member inserted into the guide hole on the rear side of the core holding member and fitting into the spiral groove; and an urging member that urges the retractable member rearward with respect to the core holding member;
The reciprocating member is provided with a pushing part that is inserted into the core holding member from the rear side and approaches or contacts the rear end of the core,
When the core holding member and the reciprocating member move forward together, the core holding member becomes unable to move forward, the retracting member moves further forward, and the pushing portion of the advancing retractable member causes the core to move forward. The feeding writing instrument according to any one of claims 3 to 5, characterized in that it is adapted to be pushed and moved. 7. The feeding writing instrument according to claim 6, wherein the reciprocating member is not engaged with the feed screw member when the reciprocating member advances to the front end side of the core.

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