CN111801226A - Propelling pencil - Google Patents

Abstract

A mechanical pencil is provided. The inner diameter of the cartridge tank is small, the cartridge can be smoothly supplied with the refill, and whether the refill is in a standby state or not and the consumption state of the refill can be easily confirmed from the outside. A display body (15) which is in contact with the rear end of a refill (9) stored in a refill tank (8) is arranged in a shaft cylinder in a manner of being capable of moving back and forth in the axis direction of a mechanical pencil (1), the display body which is in contact with the rear end of a spare refill (91) is moved forward by moving the last refill in the refill tank forward so as to follow the refill, and a window part (2b) which can see the moving state of the display body from the outside of the shaft cylinder is arranged in the shaft cylinder, and the display body comprises: a cartridge abutting section (15c) which is inserted into and removed from the cartridge case and abuts against the rear end of the cartridge housed in the cartridge case; and a display part (15b) which is arranged behind the refill abutting part, wherein when the axial direction of the mechanical pencil is vertical and the width of the display part when the front observation window part is arranged is X, and the width of the refill abutting part is Y, the X and the Y are in a relational expression of X > Y.

Description

Propelling pencil

Technical Field

The present invention relates to mechanical pencils.

Background

Conventionally, there has been known a mechanical pencil in which a lead tank is built in a shaft tube, a chuck (chuck) linked to the lead tank is provided in front of the lead tank, a lead is stored in the lead tank, and a user supplies a new lead to the lead tank when the lead in the lead tank is used up, while writing on a paper surface or the like in a state where the lead is projected from a front end opening of the shaft tube by pressing a rear end of the mechanical pencil.

In such a mechanical pencil, when the inner diameter of the lead container is large, it is difficult to smoothly supply the writing lead to the chuck, and therefore, the inner diameter of the lead container is often reduced.

On the contrary, when the inner diameter of the lead container is small, only a small amount of lead is stored in the lead container, and it is necessary to frequently replenish the lead in the lead container, but since it is impossible to externally confirm whether or not the spare lead is present in the lead container and the consumption state of the lead, there is a possibility that trouble occurs when the mechanical pencil is carried while the spare lead is not stored in the lead container, or trouble occurs when the lead is accidentally broken during use.

In view of the above problem, JPS61-78685U discloses a mechanical pencil in which a lead container for accommodating a lead is made transparent, and a part of the lead container is visible from the outside through a window provided in a barrel.

In the JPS61-78685U, the lead in the lead tank is directly seen from the window and confirmed, but the lead is generally thin in diameter and black in color, so that the presence or absence of the lead is not easily observed and is not easily confirmed.

Disclosure of Invention

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a mechanical pencil which includes: the inner diameter of the refill tank is small, the refill can be smoothly supplied to the cartridge, and whether the refill is in standby state or not and the consumption state of the refill can be easily seen from the outside.

In the present invention, in the case of the present invention,

"1. a mechanical pencil having: a shaft tube having a front end opening through which the refill protrudes and a rear end opening for replenishing the refill; the refill can is arranged in the shaft cylinder; a chuck located in front of the cartridge pot and linked with the cartridge pot; a cartridge spring for applying a force to the cartridge and the cartridge tank in a rearward direction; an accessory; an accessory holding member that is located behind the cartridge case and holds the accessory; and an operation portion which is located behind the accessory holding member and protrudes from the rear end opening portion of the barrel, and which is operated to advance the chuck in conjunction with the operation portion and feed out the writing lead, wherein a display body which is in contact with a rear end of the writing lead stored in the writing lead tank is disposed in the barrel so as to be movable back and forth in an axial direction of the mechanical pencil, the display body which is in contact with a rear end of a spare writing lead is moved forward along with the writing lead by moving the last writing lead in the writing lead tank forward, and the barrel is provided with a window portion through which a moving state of the display body can be visually confirmed from outside the barrel, the display body comprising: a cartridge abutting portion that is inserted into and removed from the cartridge tank and abuts against a rear end of the cartridge stored in the cartridge tank; and a display portion provided behind the lead abutting portion, wherein when the axial direction of the mechanical pencil is a vertical direction and the width of the display portion when the window portion is viewed from the front is X and the width of the lead abutting portion is Y, X and Y are in a relational expression of X > Y.

2. The mechanical pencil according to claim 1, wherein the display body is movably provided to the accessory holding member, the display body is located in the barrel and is movable forward and backward in the axial center direction in a state where the accessory holding member is attached to the barrel or the refill tank, and the display body is also pulled out from the barrel by detaching the accessory holding member from the barrel or the refill tank.

3. The mechanical pencil according to claim 1 or 2, wherein the window portion is obtained by forming a part of the barrel to be transparent or translucent.

4. The mechanical pencil according to any one of claims 1 to 3, wherein the display body is urged by an elastic member in a direction of the distal end opening of the barrel.

5. The mechanical pencil according to any one of claims 1 to 4, wherein the spare lead is capable of being retracted rearward from a state in which the lead abutment portion of the display body abuts against a rear end of the spare lead.

6. The mechanical pencil according to any one of claims 1 to 5, wherein a distal end of the writing lead abutting portion is located in the writing lead holder in a state where the display body is retracted to the maximum extent. ".

Effects of the invention

In the present invention, the following mechanical pencil is available: in a mechanical pencil in which a lead is fed out by operating an operating part protruding from a rear end opening of a barrel and a chuck cooperating with the operating part is advanced, whether or not a lead remains in a lead tank and a consumption state can be easily confirmed from the outside.

Drawings

Fig. 1 is a longitudinal sectional view showing a state in which a refill is provided in a refill tank in the mechanical pencil according to the present embodiment.

Fig. 2 is a cross-sectional view a1-a1 of the mechanical pencil of fig. 1.

Fig. 3 is a longitudinal sectional view showing a state in which a refill cartridge is not provided in the cartridge case in the mechanical pencil of fig. 1.

Fig. 4 is a cross-sectional view A3-A3 of the mechanical pencil of fig. 3.

Fig. 5 is a cross-sectional view B3-B3 of the mechanical pencil of fig. 3.

Fig. 6 is a longitudinal sectional view showing a state in which a writing lead is replenished to the mechanical pencil of fig. 1.

Fig. 7 is a longitudinal sectional view showing a state in which the eraser of the mechanical pencil of fig. 1 is used.

Fig. 8 is a longitudinal sectional view showing a modification of the mechanical pencil.

Fig. 9A is a partial longitudinal cross-sectional view showing another modification of the mechanical pencil.

Fig. 9B is a partial longitudinal cross-sectional view showing the operation of the mechanical pencil of fig. 9A.

Fig. 9C is a partial longitudinal cross-sectional view showing the operation of the mechanical pencil of fig. 9A.

Fig. 10A is a partial longitudinal cross-sectional view showing still another modification of the mechanical pencil.

Fig. 10B is a partial longitudinal cross-sectional view showing the operation of the mechanical pencil of fig. 10A.

Fig. 10C is a partial longitudinal cross-sectional view showing the operation of the mechanical pencil of fig. 10A.

Fig. 11A is a partial longitudinal cross-sectional view showing still another modification of the mechanical pencil.

Fig. 11B is a partial longitudinal cross-sectional view showing the operation of the mechanical pencil of fig. 11A.

Fig. 11C is a partial longitudinal cross-sectional view showing the operation of the mechanical pencil of fig. 11A.

Fig. 12 is a longitudinal sectional view showing still another modification of the mechanical pencil.

Fig. 13 is a longitudinal sectional view showing still another modification of the mechanical pencil.

Fig. 14A is a longitudinal sectional view showing a modification of the rear shaft of the mechanical pencil.

Fig. 14B is a cross-sectional view C-C of the rear axle of fig. 14A.

Fig. 15A is a longitudinal sectional view showing still another modification of the mechanical pencil.

Fig. 15B is a longitudinal sectional view showing the operation of the mechanical pencil of fig. 15A.

Detailed Description

The mechanical pencil 1 according to the present embodiment will be described in detail below with reference to the drawings.

Fig. 1 is a longitudinal sectional view showing a state in which a refill 91 is provided in a refill tank 8 in a mechanical pencil 1 of the present embodiment, fig. 2 is a transverse sectional view a1-a1 of the mechanical pencil 1 of fig. 1, fig. 3 is a longitudinal sectional view showing a state in which the refill 91 is not provided in the refill tank 8 in the mechanical pencil 1 of fig. 1, fig. 4 is a transverse sectional view A3-A3 of the mechanical pencil 1 of fig. 3, and fig. 5 is a transverse sectional view B3-B3 of the mechanical pencil 1 of fig. 3.

In the present specification, a direction in which the central axis of the mechanical pencil 1 extends (longitudinal direction, vertical direction in a vertical sectional view) is defined as an axial direction, a direction perpendicular to the axial direction is defined as a radial direction (diameter direction), and a circumferential direction around the central axis is defined as a circumferential direction. In addition, the side close to a surface to be written on, such as a paper surface, in writing along the axial direction is defined as a front side, and the side far from the surface to be written on is defined as a rear side. That is, the upper side in the vertical sectional view, i.e., the cap 5 side, is indicated as the rear, and the lower side in the vertical sectional view, i.e., the front end opening 3a side of the barrel is indicated as the front.

As shown in fig. 1, the mechanical pencil 1 of the present embodiment is configured such that a front opening 3 is provided in front of a cylindrical barrel main body 2, a rear shaft 4 is fitted into the rear of the barrel main body 2, the barrel is configured by the barrel main body 2, the front opening 3, and the rear shaft 4, and a substantially cylindrical cap 5 closed at a position closer to the rear end than a rear end opening 4a is projected.

In the cylinder main body 2, a substantially cylindrical accessory holding member 6 is inserted from the rear end opening 4a toward the front, the tip of the accessory holding member 6 is reduced in diameter to form a fitting portion 6a, and the fitting portion 8a is fitted into a fitting portion 8a, and the fitting portion 8a is provided at the rear end of a cartridge case 8 described later.

As shown in fig. 2, a plurality of engaging grooves 2a are formed in the inner peripheral surface of the rear portion of the shaft tube main body 2, a plurality of engaging projections 6b are formed in the outer peripheral surface of the accessory holding member 6, and the shaft tube main body 2 and the accessory holding member 6 are locked (rotation-restricted) by engaging the engaging grooves 2a with the engaging projections 6 b.

As shown in fig. 1, the rear end of the accessory holding member 6 is formed in a cylindrical shape, a cylindrical rubber 7 is fitted as an accessory, the cap 5 is detachably screwed, an external thread portion 6c is provided on the outer peripheral surface of the rear portion of the accessory holding member 6, the cap 5 having an internal thread portion 5a on the inner peripheral surface of the front portion is detachably screwed, and the rubber 7 is covered with the cap 5.

A cartridge tank 8 having an inner diameter of 2.2mm, which is formed of a polypropylene tube, is disposed inside the barrel body 2, a cartridge 9 and a spare cartridge 91 are housed in the cartridge tank 8, an engaging portion 8a is provided at a rear end opening of the cartridge tank 8, the engaging portion 6a provided at the tip of the accessory holder 6 is engaged, the tip of the cartridge tank 8 is inserted into a substantially cylindrical coupling 10, and a collet 11 made of brass is press-fitted and fixed to the tip opening of the cartridge tank 8.

The cartridge 11 is divided into a plurality of front parts, an annular fastener 12 is fitted to the outside of the cartridge head 11a, a cartridge spring 13 is fitted between a coupling 10 for receiving the rear end of the fastener 12 and the front end of the cartridge case 8, and the cartridge head 11a biased rearward by the cartridge spring 13 holds the refill 9.

The front opening 3 is formed in a pointed shape with both ends open, the lead 9 protrudes from the front opening 3a, a lead holder 14 for holding the lead 9 is disposed inside, a female screw portion 3b is provided on the inner peripheral surface of the rear portion, and the male screw portion 10a provided on the outer peripheral surface of the front portion of the coupling 10 is screwed.

The attachment holding member 6 is formed in a cylindrical shape with a depth of about 3/4 a from the front end to the entire length thereof, and has slits 6d extending in the axial direction formed in both side surfaces.

A substantially cylindrical display body 15 is disposed in the accessory holding member 6 so as to be movable forward and backward, a spring 16 is fitted between the accessory holding member 6 and the display body 15, the display body 15 is biased forward by the spring 16, protruding portions 15a are formed on both side surfaces of the rear portion of the display body 15, the protruding portions 15a are fitted into the slits 6d, and display portions 15b are provided on the side surfaces of the protruding portions 15 a.

The front portion of the display body 15 has a pen core contact portion 15c whose diameter is reduced from the tip to about 1/2 of the entire length, and the tip of the pen core contact portion 15c is inserted into the pen core can 8.

The cylindrical body 2 is molded from a transparent resin, and the window 2b is provided by color-printing the surface of the cylindrical body 2 other than the window 2 b.

(in FIGS. 1, 2, 3, and 4, the window portion 2b is shown by a broken line.)

As shown in fig. 2, 4 and 5, when the window portion 2b is viewed from the front, the width X of the display portion 15b of the display body 15 is 3mm, the width Y of the pen refill contact portion 15c of the display body 15 is 2mm, and the width X1 of the window portion 2b is 3 mm. Although not shown, the height of the window portion is 5 mm.

As shown in fig. 1, when the refill 91 is provided in the refill tank 8, the display portion 15b of the display body 15 is positioned rearward of the window portion 2b of the shaft body 2 by bringing the front end of the refill abutting portion 15c into abutment with the rear end of the refill 91 stored in the refill tank 8, and therefore the display portion 15b is not visible from the window portion 2b of the shaft body 2.

Further, the color of the display portion 15b and the color of the portion constituting the periphery of the window portion 2b are preferably different from each other. For example, when the display portion 15b has a dark color, the portion around the window portion 2b preferably has a light color. In particular, when the display portion 15b has a dark color, it is preferable that the display portion 15b be easily visible around the window portion 2b when the portion constituting the periphery of the window portion 2b has a color close to white.

When the lead 9 is consumed by writing, when the cap 5 is pressed forward of the mechanical pencil 1 against the elastic force of the collet spring 13, the attachment holding member 6 screwed into the cap 5 moves forward, the lead tank 8 fitted into the attachment holding member 6 moves forward, the collet 11 moves forward with the lead 9 fixed, the fastener 12 abuts against the inner surface of the front opening 3 and stops moving, the fastener 12 is disengaged from the collet head 11a, and the lead 9 is fed out while the collet head 11a is expanded.

Even if the cartridge head 11a expands, the pen core 9 is held by the pen core holder 14 and therefore does not fall from the distal end opening 3 a.

When the pressing of the cap 5 is stopped, the cartridge case 8 is moved backward by the elastic force of the cartridge spring 13, the cartridge 11 is moved backward, the fastener 12 abuts on the front end of the coupling member 10 to stop moving and is fitted to the cartridge head 11a, the cartridge head 11a is closed to fix the cartridge 9, and writing is performed.

Next, a state in which the mechanical pencil 1 according to the present embodiment does not have the spare lead 91 will be described in detail with reference to fig. 3, 4, and 5.

When the writing is performed to use up the refill 9 held by the cartridge head 11a, the last spare refill 91 stored in the refill tank 8 falls into the cartridge 11 by its own weight, and the display member 15 abutting the rear end of the spare refill 91 moves forward following the spare refill 91, whereby the display portion 15b of the display member 15 can be viewed from the window 2b of the cylinder main body 2.

At this time, the inner diameter of the cartridge 8 is small, and therefore, the supply of the pen core to the cartridge 11 is smooth.

Even if the mechanical pencil 1 is held with the distal end opening 3a facing upward, the display body 15 is urged forward by the spring 16 and therefore does not move backward, and the display of the window 2b is maintained in a state where the refill tank 8 does not have the refill 91. In addition, the spring 16 may be omitted. In this case, when the distal end opening 3a is directed downward without the refill 91, the display body 15 moves forward by its own weight. On the other hand, when the front end opening 3a is directed upward, the display body 15 moves backward by its own weight. Even in this case, the presence or absence of the refill 91 can be checked with the distal end opening 3a facing downward.

Next, a state in which the writing lead 9 is replenished to the mechanical pencil 1 according to the present embodiment will be described in detail with reference to fig. 6.

When the cap 5 is pulled rearward by holding the barrel main body 2 with one hand and holding the cap 5 with the other hand, the cap 5 is screwed with the female screw portion 5a on the inner peripheral surface of the front portion thereof into the male screw portion 6c on the outer peripheral surface of the rear portion of the accessory holding member 6, and therefore, even if a force in the axial direction is applied, the accessory holding member 6 is not detached from the accessory holding member 6, and therefore, the accessory holding member 6 is pulled rearward together with the cap 5, the fitting portion 6a at the front end of the accessory holding member 6 is detached from the fitting portion 8a at the rear end of the refill tank 8, and the cap 5 and the accessory holding member 6 with the rubber 7 fitted therein are pulled out of the mechanical pencil 1 in a coupled state and are opened from the rear end opening portion 4 a.

At this time, although the display body 15 moves forward due to its own weight and the elastic force of the spring 16, the protruding portions 15a provided on both side surfaces of the rear portion of the display body 15 are fitted into the slits 6d provided on both side surfaces of the accessory holding member, and therefore, the protruding portions 15a abut against the tip ends of the slits 6d, and the display body 15 is prevented from falling off the accessory holding member 6, and the display body 15 is also pulled out from the mechanical pencil 1.

When the lead 9 is dropped into the mechanical pencil 1 through the rear end opening 4a, the lead 9 is accommodated in the lead container 8.

When the shaft tube main body 2 is held by one hand and the cap 5 is held by the other hand and the accessory holding member 6 and the display body 15 connected to the cap 5 are inserted into the mechanical pencil 1 from the rear end opening 4a, the fitting portion 6a formed at the tip of the accessory holding member 6 is fitted into the fitting portion 8a provided at the rear end of the pencil lead tank 8, and the refill 9 is completely refilled into the pencil lead tank 8.

Next, the state of using the eraser 7 of the mechanical pencil 1 according to the present embodiment will be described in detail with reference to fig. 2 and 7.

When the cap 5 is rotated counterclockwise as viewed from the rear side while holding the barrel body 2 with one hand and the cap 5 with the other hand, a counterclockwise force is also applied to the accessory holding member 6 screwed with the cap 5 as viewed from the rear, however, since the plurality of engaging projections 6b formed on the outer peripheral surface of the accessory holding member 6 are engaged with the plurality of engaging grooves 2a formed on the inner peripheral surface of the rear portion of the cylinder main body 2, the number of engaging grooves 2a, even if a force in the circumferential direction is applied, the accessory holding member 6 does not rotate relative to the barrel main body 2, and therefore, only the cap 5 rotates, thus, the male screw portion 6c provided on the outer peripheral surface of the rear portion of the accessory holding member 6 is disengaged from the female screw portion 5a provided on the inner peripheral surface of the cap 5, and the rubber 7 fitted into the accessory holding member 6 is exposed and usable.

In the present embodiment, the following mechanical pencil was obtained: the width of the display portion 15b can be increased without increasing the inner diameter of the cartridge tank 8, and whether or not the refill 91 is stored in the cartridge tank 8 and the status of consumption can be easily checked from the window portion 2b by viewing the moving state of the display body 15 through the window portion 2b, thereby making it possible to smoothly supply the refill to the cartridge 11.

Further, the cap 5, the eraser 7, the accessory holding member 6, and the display body 15 can be removed from the mechanical pencil 1 and the rear end opening 4a can be opened only by pulling the cap 5 rearward in the axial direction with respect to the mechanical pencil 1, so that the cap 5, the accessory holding member 6 with the eraser 7 inserted therein, and the display body 15 are not easily lost and the refill 9 can be easily refilled without the need of a double step of removing the cap 5 from the mechanical pencil 1 and placing it on a desk and then removing the accessory holding member 6 with the eraser 7 inserted therein and placing it on a desk.

Further, the eraser 7 can be exposed only by rotating the cap 5 in the circumferential direction with respect to the mechanical pencil 1, and the portion of the mechanical pencil 1 to be gripped is not changed at the time of use of the eraser 7 and at the time of replenishment of the writing lead 9.

In the present embodiment, the following mechanical pencil 1 can be obtained: the display body 15 abutting against the rear end of the refill 9 housed in the refill tank 8 is disposed in the shaft cylinder so as to be movable back and forth in the axial direction, and by moving the last refill 9 in the refill tank 8 forward, the display body 15 abutting against the rear end of the spare refill 91 moves forward following the spare refill 91, and the shaft cylinder is provided with a window portion 2b through which the moving state of the display body 15 can be seen from the outside of the shaft cylinder, and the display body 15 includes: a cartridge abutting portion 15c that is inserted into and removed from the cartridge tank 8 and abuts against the rear end of the cartridge 9 housed in the cartridge tank 8; and a display part 15b provided behind the cartridge abutting part 15c, wherein when the width of the display part 15b is X and the width of the cartridge abutting part 15c is Y when the window part 2b is viewed from the front, X and Y are in a relational expression of X > Y, and the display body 15 moves forward following the cartridge 9 when the last cartridge 9 in the cartridge tank 8 enters the cartridge 11, and the moving state of the display body 15 can be viewed from the window part 2b, and the width of the display part 15b can be increased without increasing the inner diameter of the cartridge tank 8, so that the cartridge supply to the cartridge 11 is smooth, and whether the spare cartridge 91 and the cartridge 9 are consumed in the cartridge tank 8 can be easily seen from the outside.

When the plurality of writing cores 9 including the spare writing core 91 are provided in the writing core tank 8, the tip of the spare writing core 91 abuts against the rear end of the chuck 11 by its own weight, and the tip of the writing core abutting portion 15c of the display body 15 abuts against the rear end of the spare writing core 91 by its own weight, whereby the display body 15 does not move forward.

On the other hand, when the cartridge is empty of the refill 9 held therein and the spare refill 91 in the refill tank 8 becomes the last refill 9, the rear end of the spare refill 91 moves forward when the last refill 9 enters the cartridge by its own weight, and the indicator 15 abutting the rear end of the last refill 9 moves forward following the refill 9 by its own weight.

Since the moving state of the display body 15 can be seen from the outside, the presence or absence of the refill 91 in the refill tank 8 and the consumption state can be easily checked.

The material of the display 15 in the present embodiment is not particularly limited, and various materials such as resin and metal can be selected, and the shape of the display 15 is also not particularly limited, and various shapes such as a cylindrical shape and a prismatic shape can be selected.

For example, when a plurality of refills 9 including the spare refill 91 are stored in the refill tank 8, it is preferable that the display member 15 is in contact with the rear end of the spare refill 91 to make the display portion 15b visible through the window 2b white in this state, the display member 15 in contact with the rear end of the last refill 9 is moved forward following the refill 9 by moving the last refill 9 in the refill tank 8 forward, and the display portion 15b visible through the window 2b is red in this state, whereby whether or not the spare refill 91 is present in the refill tank 8 can be easily confirmed from the outside by changing the color of the window 2b from white to red.

Further, by printing characters or engraving symbols on the display portion 15b of the display body 15, it is possible to easily confirm whether or not the refill 91 is present in the refill tank 8 from the outside by changing the pattern of the window portion 2 b.

Further, a configuration may be adopted in which, when a plurality of refills 9 including the spare refill 91 are stored in the refill tank 8, the display member 15 abuts on the rear end of the spare refill 91, the display portion 15b is not visible from the window portion 2b in this state, and the display member 15 abutting on the rear end of the last refill 9 is moved forward following the refill 9 by moving the last refill 9 in the refill tank 8 forward, so that the display portion 15b can be seen from the window portion 2b in this state, and by forming such a configuration, the display portion 15b can be seen from the window portion 2b, whereby it is also possible to easily see from the outside whether or not the spare refill 91 is present in the refill tank 8, or conversely, a configuration may be adopted in which, when a plurality of refills 9 including the spare refill 91 are stored in the refill tank 8, the display portion 15b can be seen from the window portion 2b, by configuring as above so that the display portion 15b cannot be seen from the window portion 2b in a state where the display body 15 is moved forward, it is possible to easily confirm whether or not the refill 91 is present in the refill tank 8 from the outside by the fact that the display portion 15b cannot be seen from the window portion 2 b.

Further, by adopting a configuration in which the width of the display portion 15b that can be viewed from the window portion 2b in a state in which the last refill 9 in the refill tank 8 moves forward and the display body 15 moves forward following the refill 9 is wider than the width of the display portion 15b that can be viewed from the window portion 2b in a state in which a plurality of refills 9 including the spare refill 91 are stored in the refill tank 8, or by adopting a reverse configuration, it is possible to easily confirm from the outside whether or not the spare refill 91 is present in the refill tank 8 by changing the width of the display portion 15b that can be viewed from the window portion 2 b.

The shape of the display portion 15b that can be viewed through the window portion 2b may be changed depending on whether or not the refill 91 is present in the refill tank 8.

Further, since the tip of the display body 15 may be configured to abut not only the rear end of the spare lead 91 stored in the lead tank 8 but also the rear end of the lead 9 inserted into the cartridge 11, and the display body 15 continuously moves forward as the lead 9 in use is consumed, for example, the surface of the display portion 15b is colored in a progressive manner in which the color tone or the shade of the color changes continuously from the front toward the rear, and the remaining amount of the lead 9 in use can be continuously checked from the change in the color tone or the shade of the color on the surface of the display portion 15b that can be observed from the window portion 2 b.

The width of the display portion 15b indicates the length of the display portion 15b in the direction (radial direction) perpendicular to the axial direction of the mechanical pencil 1 when the axial direction of the mechanical pencil 1 is set to be vertical and the window portion 2b is viewed from the front, and indicates the diameter if the display portion 15b is cylindrical or cylindrical.

In the present embodiment, a vibration-type mechanical pencil is obtained in which the following lead feeding structure is mounted: since the inner diameter of the lead tank 8 does not need to be increased even if the width of the display portion 15b is increased, a gap can be provided between the barrel and the lead tank 8 without increasing the thickness of the barrel, the weight member can be disposed in the gap so as to be movable forward and backward in the axial direction of the mechanical pencil 1, and the lead 9 can be fed out from the front end opening of the barrel by advancing the chuck 11 by the weight member which advances by swinging the barrel forward and backward.

Further, since it is not necessary to thicken a portion of the barrel which is gripped by a hand during writing, even a user with a small hand can easily write. The width X of the display portion 15b is preferably 2mm or more and 5mm or less from the viewpoint of easy visibility and easy arrangement in the barrel, and the width Y of the lead abutting portion 15c is preferably 1mm or more and 4mm or less from the viewpoint of being inserted into and removed from the lead tank 8 having a small inner diameter and smoothly supplying the lead to the cartridge 11, and the difference between X and Y is preferably 1mm or more.

In addition, from the viewpoint of the moving state of the display 15 and the easy visibility of the display unit 15b, the width X1 of the window 2b is preferably 2mm or more, and the length of the window 2b is preferably 3mm or more.

The method of disposing the display member 15 in the present embodiment is not particularly limited as long as the display member 15 is disposed so as to be movable back and forth in the axial direction of the mechanical pencil 1, but the display member 15 may be movably disposed in the accessory holding member 6.

For example, the rubber holding member in which the rubber 7 is fitted at the rear end is used as the accessory holding member 6, the display body 15 is movably provided in front of the rubber holding member, the display body 15 can be positioned in the lead tank 8 in a state in which the rubber holding member is fitted at the rear end of the lead tank 8 and can be moved forward and backward in the axial direction, and not only can the display body 15 be moved forward in accordance with the presence or absence of the spare lead 91 stored in the lead tank 8 to easily confirm the presence or absence of the remaining lead from the window portion 2b, but also the rubber holding member and the display body 15 can be removed together from the mechanical pencil 1 by a one-time operation of holding the shaft cylinder with one hand, holding the rubber holding member with the other hand, and pulling the rubber holding member rearward in the axial direction, and therefore, it is possible to reduce the need to remove the cap 5 and the rubber holding member from the mechanical pencil main body and then remove the display body 15 from the lead tank 8 Time for refill replenishment.

Further, when the cap 5 covering the eraser 7 is attached to the eraser holder, the attaching/detaching direction of the eraser holder to/from the shaft tube or the lead tank 8 and the attaching/detaching direction of the cap 5 to/from the eraser holder can be made different from each other, whereby the time and effort required for refill replenishment can be further reduced.

For example, the rubber holding member is attached to and detached from the lead container 8 by pressing forward or pulling backward in the axial direction of the mechanical pencil 1, the attachment or detachment of the cap 5 to the eraser holding member is performed by a clockwise or counterclockwise rotating operation of the mechanical pencil 1 in the circumferential direction, thus, the cap 5, the rubber 7, the rubber holding member, and the display body 15 can be removed together from the mechanical pencil 1 by a one-time operation of holding the barrel with one hand, holding the cap 5 with the other hand, and pulling the cap 5 toward the rear in the axial direction to replenish the writing lead 9, the cap 5 can be detached from the eraser holder to expose the eraser 7 for use by a one-time operation of holding the barrel with one hand and holding the cap 5 with the other hand and rotating the cap 5 in the circumferential direction, the portion of the mechanical pencil 1 to be gripped is not changed at the time of replenishing the lead 9 and at the time of using the eraser 7.

The window portion 2b in the present embodiment may be any window portion as long as the inside of the shaft tube can be seen from the outside.

The window portion 2b may be provided by opening a hole communicating the inside and the outside of the shaft tube, or the window portion 2b may be provided by forming a part of the shaft tube to be transparent or translucent.

In particular, when the window portion 2b is provided by forming a part of the shaft tube to be transparent or translucent, it is preferable that dust, or the like does not enter the shaft tube or the cartridge tank 8 from the outside and prevent the forward and backward movement of the display body 15, and the display portion 15b is not difficult to be viewed due to dirt, scratch, or the like.

The window portion 2b may be provided by forming the shaft tube of a transparent or translucent material and applying color printing or coating to the surface of the shaft tube other than the window portion 2b, or the window portion 2b may be provided by attaching a colored film to the surface of the shaft tube other than the window portion 2 b.

The window portion 2b may be provided by forming the entire shaft tube of an opaque material and fitting a transparent body with a portion corresponding to the window portion 2b being opened, or the window portion 2b may be provided by forming the entire shaft tube of an opaque material and forming the window portion 2b of a transparent material by two-color molding, insert molding, or the like.

Further, the window portion 2b can be formed as a lens, and the moving state of the display body 15 based on whether or not the refill 91 exists in the refill tank 8 can be observed more easily.

The structure in which the display body 15 of the present embodiment is disposed so as to be able to move forward and backward in the axial direction of the mechanical pencil 1 by abutting the rear end of the refill 9 housed in the refill tank 8 is not particularly limited, but it is preferable to dispose a coil spring (spring 16) inside the shaft tube, fixedly attach one end of the coil spring to the accessory holding member 6, fixedly attach the other end of the coil spring to the display body 15, and urge the display body 15 forward.

This is because, even when the mechanical pencil 1 having no spare writing lead 91 in the writing lead tank 8 is held with the distal end opening portion of the barrel upward when the coil spring is provided, for example, the display body 15 is urged forward by the coil spring, and therefore the display body 15 does not retreat due to its own weight, and therefore, the display of the window portion 2b can be maintained in a state where the display body 15 has moved forward, that is, in a state where the spare writing lead 91 is not provided in the writing lead tank 8, and whether or not the spare writing lead 91 and the consumption state of the writing lead 9 are present in the writing lead tank 8 can be easily confirmed from the outside.

The material of the lead tank 8 of the present embodiment is not particularly limited, and various materials such as resin and metal can be selected, but it is preferable to subject the inner wall surface thereof to silicone treatment.

By performing the silicone treatment, even when the display body 15 comes into contact with the inner wall surface of the pen core container 8, smooth forward and backward movement of the display body 15 is not hindered.

Further, the inner wall surface of the refill tank 8 is less likely to be stained by the friction between the rear end portion of the spare refill 91 and the inner wall surface of the refill tank 8, and even when powder of the refill 9 is generated, the inner wall surface of the refill tank 8 is less likely to be stained by the adhesion of the powder of the refill 9.

The shape of the lead tank 8 in the present embodiment is not particularly limited, and various shapes such as a cylindrical shape can be selected, but it is preferable to provide a diameter-enlarged portion that enlarges the inner diameter at the rear portion of the lead tank 8.

By providing the enlarged diameter portion, the tip of the enlarged diameter portion can be a refill receiving portion, and the rear end portion of the spare refill 91 can be separated from the inner wall surface of the enlarged diameter portion in a state where a plurality of refills including the spare refill 91 are accommodated in the refill tank 8.

Further, by providing the enlarged diameter portion, when the refill 9 is refilled from the rear end opening portion of the barrel to the refill tank 8, the refill 9 can be refilled more easily than in the case where the rear end of the refill tank 8 is originally the inlet of the refill 9.

Further, even when the mechanical pencil 1 is carried with the spare lead 91 stored in the lead tank 8 and vibration is applied thereto or when an impact due to dropping or the like is applied to the mechanical pencil 1, the inner wall surface of the lead tank 8 is less likely to be stained by friction between the rear end portion of the spare lead 91 and the inner wall surface of the lead tank 8, and the movement state of the rear end portion of the lead 9 and/or the display 15 is more likely to be confirmed through the lead tank 8 and the window portion 2 b.

Further, since the powder of the refill 9 generated by the friction between the rear end portion of the spare refill 91 and the inner wall surface of the refill tank 8 is reduced, the inner wall surface of the refill tank 8 is less likely to be stained by the adhesion of the powder of the refill 9, and the movement state of the rear end portion of the refill 9 and/or the display body 15 is more likely to be confirmed through the refill tank 8 and the window portion 2 b.

Further, the cartridge is less likely to be jammed by powder of the pen core 9 entering the cartridge 11.

Further, in a state where the spare cartridge 91 is housed in the cartridge case 8, when the length from the rear end of the spare cartridge 91 to the cartridge support portion at the front end of the enlarged diameter portion is L and the angle formed by the horizontal plane passing through the cartridge support portion and the spare cartridge 91 is θ, and when the cartridge case 8 and the enlarged diameter portion are formed so that the difference between the inner diameter of the cartridge case 8 and the inner diameter of the enlarged diameter portion becomes 2Lcos θ or more, even when the spare cartridge 91 is tilted in the cartridge case 8, the rear end of the spare cartridge 91 can be constantly separated from the inner wall surface of the enlarged diameter portion, and therefore, the contact between the rear end portion of the cartridge 9 and the cartridge case 8 can be effectively suppressed.

As accessories of the present embodiment, in addition to the eraser 7 for correcting mischaracters, a ballpoint pen, a marker pen, a correction tape, a touch pen for a smartphone or a tablet terminal, and the like can be used as appropriate.

Further, it is also possible to use, as the pen core 9, a solid pen core containing a reversible thermochromic microcapsular pigment material and capable of forming writing having a reversible thermochromic property by writing, and as accessories, a friction member capable of changing or fading the color of the writing formed by the solid pen core by frictional heat with the paper surface.

In addition, various modifications can be made to the above-described embodiments. Hereinafter, modifications will be described with reference to the drawings as appropriate. In the following description and the drawings used in the following description, the same reference numerals as those used for corresponding portions in the above-described embodiment are used for portions that can be configured in the same manner as in the above-described embodiment, and redundant description is omitted.

Fig. 8 is a longitudinal sectional view showing a modification of the mechanical pencil 1. In the illustrated mechanical pencil 1, the barrel has: a front shaft 21 disposed between the shaft tube main body 2 and the front opening 3; and an inner shaft 22 disposed inside the front shaft 21, the shaft tube body 2, and the rear shaft 4. The front axle 21 has a substantially cylindrical shape as a whole. An external thread portion 21a is provided on the front outer side of the front axle 21, and an internal thread portion 21b is provided on the rear inner side of the front axle 21. The front shaft 21 is attached to the front port 3 by screwing the external thread portion 21a of the front shaft 21 into the internal thread portion 3b of the front port 3. The inner shaft 22 has a substantially cylindrical shape as a whole. An external thread portion 22a is provided on the front outer side of the inner shaft 22, and an engaging projection 22b is provided on the rear outer side of the inner shaft 22. The external thread portion 22a of the inner shaft 22 is screwed into the internal thread portion 21b of the front shaft 21, whereby the inner shaft 22 is attached to the front shaft 21. The inner shaft 22 is attached to the rear shaft 4 by engaging the engagement projection 22b of the inner shaft 22 with the engagement hole 4b provided in the rear shaft 4.

The inner shaft 22 has a window portion 22 c. The window 22c is a portion through which the user can see the display portion 15b of the display body 15 through the window 22 c. In the present modification, the window portion 22c is configured as a through hole that penetrates the inner shaft 22 from the inner surface to the outer surface, but is not limited to this, and the window portion 22c may be configured as a transparent portion of the inner shaft 22 or may be configured to insert another transparent member into a through hole provided in the inner shaft 22. At least a portion of the cylindrical main body 2 located radially outward of the window portion 22c is formed of a transparent member. Thereby, the user can see the window portion 22c of the inner shaft 22 through the transparent member. In addition, "transparent" in the present specification includes not only colorless transparency but also colored transparency.

In the mechanical pencil 1 of the present modification, the window portion 22c can be formed by the through hole, and therefore, the confirmation performance for confirming the display body 15 through the window portion 22c can be improved. Further, since the window portion 22c is covered with the cylindrical body 2, foreign matter such as dust can be prevented from entering the interior through the window portion 22 c.

In the mechanical pencil 1 according to the present modification, the outer surface of the inner shaft 22 can be decorated to provide a decorative portion. In this case, since the decorative portion of the inner shaft 22 is covered by the shaft body 2, the decorative portion can be prevented from being scratched by the hand of the user or an external member, thereby preventing the decorative portion from being worn.

Fig. 9A to 9C are longitudinal sectional views showing still another modification of the mechanical pencil 1. In fig. 9A to 9C, the broken line indicates the position in the axial direction of the tip of the lead abutting portion 15C in fig. 9A.

When the refill 91 is provided in the refill tank 8, as shown in fig. 9A, the tip of the refill contact portion 15c of the display body 15 comes into contact with the rear end of the refill 91. When the lead 9 is consumed and the remaining length of the lead 9 is reduced, the rear end of the lead 9 is positioned forward of the rear end of the chuck 11 in a state where the front end of the lead 9 protrudes forward from the front end opening 3a of the front opening 3. At this time, as shown in fig. 9B, the tip of the refill 91 may enter the cartridge 11. In this case, the writing lead 9 and the spare writing lead 91 are aligned linearly in the axial direction. At this time, the indicator 15 is located at a position advanced forward from the position shown in fig. 9A by an amount corresponding to the amount by which the spare cartridge 91 is advanced.

In this state, when the refill 9 is retracted to store the refill 9, the spare refill 91 is also pushed by the refill 9 to be retracted. In the present modification, as shown in fig. 9C, the display body 15 is configured to be capable of being retracted rearward from a position (position shown in fig. 9A) at which the lead abutting portion 15C abuts against the rear end of the spare lead 91. Therefore, when the refill 91 is pushed by the refill 9 and retreated, the indicator 15 can be retreated together with the refill 91. This allows the spare cartridge 91 to be retracted rearward from a state where the cartridge contact portion 15c of the display body 15 is in contact with the rear end of the spare cartridge 91. Preferably, the display body 15 is configured to be capable of retreating rearward by 0.5mm or more from the position where the lead abutting portion 15c abuts against the rear end of the spare lead 91. More preferably, the display body 15 is configured to be capable of retreating backward by 2mm or more from the position where the lead abutting portion 15c abuts the rear end of the spare lead 91. The position where the lead abutting portion 15c abuts the rear end of the spare lead 91 is defined as follows: in a state where the leading end of the refill 91 is not located behind the refill 9 in the axial direction, in other words, in a state where the leading end of the refill 91 is located radially outward of the trailing end of the refill 9, the refill abutting portion 15c is located at the forefront and the refill abutting portion 15c abuts against the trailing end of the refill 91.

Fig. 10A to 10C are longitudinal sectional views showing still another modification of the mechanical pencil 1. In fig. 10A to 10C, the dotted line indicates the position in the axial direction of the tip of the lead abutting portion 15C in fig. 10A.

In the example shown in fig. 10A to 10C, a relief portion 15d is formed at the tip of the lead abutting portion 15C of the display body 15. In the illustrated example, the relief portion 15d is formed of a recessed portion 15e, and the recessed portion 15e is recessed rearward from the distal end surface of the lead abutting portion 15 c. The depth of the recess 15e in the axial direction is preferably 2mm or more.

When the refill 91 is provided in the refill tank 8, as shown in fig. 10A, the tip of the refill contact portion 15c of the display body 15 comes into contact with the rear end of the refill 91. When the remaining length of the pen core 9 decreases, the rear end of the pen core 9 is located forward of the rear end of the cartridge 11, and as shown in fig. 10B, the front end of the refill 91 may enter the cartridge 11, as in the modification described with reference to fig. 9A to 9C.

In this state, when the refill 9 is retracted to store the refill 9, the spare refill 91 is also pushed by the refill 9 to be retracted. In the present modification, a recess 15e is formed at the tip of the lead abutting portion 15c of the display body 15. Therefore, the rear end of the spare lead 91 can enter the recess 15e and retreat in the axial direction. This allows the spare cartridge 91 to be retracted rearward from a state where the cartridge contact portion 15c of the display body 15 is in contact with the rear end of the spare cartridge 91. In particular, when the depth of the recess 15e in the axial direction is 0.5mm or more, the spare pen core 91 can be retracted rearward by 0.5mm or more from a state where the pen core contact portion 15c of the display body 15 is in contact with the rear end of the spare pen core 91, which is preferable. Further, when the depth of the recess 15e in the axial direction is 2mm or more, the spare lead 91 can be retracted rearward by 2mm or more from a state where the lead abutting portion 15c of the display body 15 abuts against the rear end of the spare lead 91, and therefore, it is more preferable.

Fig. 11A to 11C are longitudinal sectional views showing still another modification of the mechanical pencil 1. In fig. 11A to 11C, the dotted line indicates the position in the axial direction of the tip of the lead abutting portion 15C in fig. 11A.

In the example shown in fig. 11A to 11C, a relief portion 15d is formed at the tip of the lead abutting portion 15C of the display body 15. In the illustrated example, the relief portion 15d includes a slope 15f, and the slope 15f is provided at the tip of the lead abutment portion 15 c. The inclined surface 15f is inclined with respect to both the axial direction and the radial direction. The distance along the axial direction between the point located at the forefront and the point located at the rearmost of the inclined surfaces 15f is preferably 2mm or more.

When the refill 91 is provided in the refill tank 8, as shown in fig. 11A, the tip of the refill contact portion 15c of the display body 15 comes into contact with the rear end of the refill 91. When the remaining length of the refill 9 decreases, the rear end of the refill 9 is positioned forward of the rear end of the cartridge 11, and as shown in fig. 11B, the front end of the refill 91 may enter the cartridge 11, as in the modification described with reference to fig. 9A to 9C.

In this state, when the refill 9 is retracted to store the refill 9, the spare refill 91 is also pushed by the refill 9 to be retracted. In the present modification, a slope 15f is formed at the tip of the lead abutting portion 15c of the display body 15. Therefore, the rear end of the refill 91 can retreat along the slope 15 f. This allows the spare cartridge 91 to be retracted rearward from a state where the cartridge contact portion 15c of the display body 15 is in contact with the rear end of the spare cartridge 91. In particular, when the distance along the axial direction between the point located at the forefront and the point located at the rearmost in the inclined surface 15f is 0.5mm or more, the spare pen core 91 can be retracted rearward by 0.5mm or more from the state where the pen core contact portion 15c of the display body 15 is in contact with the rear end of the spare pen core 91, which is preferable. Further, when the distance along the axial direction between the point located at the forefront and the point located at the rearmost in the inclined surface 15f is 2mm or more, the refill 91 can be retracted rearward by 2mm or more from the state where the refill contact portion 15c of the display body 15 is in contact with the rear end of the refill 91, which is more preferable.

In the example shown in fig. 11A to 11C, when the refill 9 in use is retracted and stored in a state where the tip of the spare refill 91 enters the cartridge 11, and the spare refill 91 is also pushed by the refill 9 and retracted, the position of the spare refill 91 is displaced in the radial direction from the axis of the refill 9 (on the center axis of the mechanical pencil 1), whereby the state where the spare refill 91 is located behind the refill 9 and the spare refill 91 are aligned in the axial direction can be eliminated. Therefore, the backup pen core 91 can be prevented from being pressed by the pen core 9 and broken due to the hindrance of the retraction of the pen core 9.

As still another modification of the modifications described with reference to fig. 9A to 11C, at least the cartridge abutting portion 15C of the display body 15 may be formed of a material having flexibility or an elastic member such as a spring. In this case, when the refill 9 in use is retracted and stored in a state where the leading end of the refill 91 enters the cartridge 11, and the refill 91 is also pushed by the refill 9 to retract, the refill contact portion 15c is deformed, and the trailing end of the refill 91 can retract. This allows the spare cartridge 91 to be retracted rearward from a state where the cartridge contact portion 15c of the display body 15 is in contact with the rear end of the spare cartridge 91. In particular, the material forming the refill abutting portion 15c and the shape of the refill abutting portion 15c are preferably selected so that the spare refill 91 can be retracted rearward by 0.5mm or more from a state in which the refill abutting portion 15c of the display body 15 abuts against the rear end of the spare refill 91. Further, the material forming the refill abutting portion 15c and the shape of the refill abutting portion 15c are more preferably selected so that the spare refill 91 can be retracted rearward by 2mm or more from a state where the refill abutting portion 15c of the display body 15 abuts against the rear end of the spare refill 91.

In each of the modifications described with reference to fig. 9A to 11C and the further modification of each of the above modifications, the refill 91 is set to be able to retreat rearward from a state in which the refill abutting portion 15C of the display body 15 abuts against the rear end of the refill 91. This allows the spare cartridge 91 to be retracted rearward from a state where the cartridge contact portion 15c of the display body 15 is in contact with the rear end of the spare cartridge 91. Therefore, the backup pen core 91 is positioned behind the pen core 9, and hence the backup pen core 9 is prevented from being retracted and the backup pen core 91 is prevented from being pressed by the pen core 9 and broken. Preferably, the spare lead 91 can be retracted rearward by 0.5mm or more from a state where the lead abutting portion 15c of the display body 15 abuts against the rear end of the spare lead 91. More preferably, the spare lead 91 can be retracted rearward by 2mm or more from a state where the lead abutting portion 15c of the display body 15 abuts the rear end of the spare lead 91. In this case, it is possible to more effectively prevent the backup pen core 91 from being positioned behind the pen core 9 and interfering with the retraction of the pen core 9 and the backup pen core 91 from being pressed by the pen core 9 and broken.

Fig. 12 is a longitudinal sectional view showing still another modification of the mechanical pencil 1. In fig. 12, the mechanical pencil 1 is shown with the distal end opening 3a facing upward. In the illustrated example, the spring 16 is omitted as compared with the embodiment described with reference to fig. 1. In other words, the mechanical pencil 1 shown in fig. 12 does not have the spring 16. In this case, the display body 15 is retracted by its own weight in a state where the front end opening 3a is directed upward. In the mechanical pencil 1 of the present modification, the distal end of the lead abutting portion 15c of the display body 15 is positioned in the lead tank 8 in a state where the display body 15 is retracted to the maximum extent. That is, the tip of the pen core contact portion 15c does not come off from the pen core can 8 regardless of the position where the display body 15 is disposed. Such a configuration is realized by appropriately setting the axial length of the refill abutting portion 15 c.

Dust may be generated in the cartridge tank 8 by scraping the cartridge 9 or the spare cartridge 91. According to the mechanical pencil 1 of the present modification, even in a state where the distal end opening 3a is directed upward and the display body 15 is retracted to the maximum extent, such leakage of dust from the lead reservoir 8 can be suppressed. Therefore, the mechanical pencil 1 can be prevented from being soiled with dust.

Fig. 13 is a longitudinal sectional view showing still another modification of the mechanical pencil 1. In the illustrated mechanical pencil 1, the barrel body 2 includes a1 st portion 2c and a 2 nd portion 2f disposed rearward of the 1 st portion 2c, and the 1 st portion 2c and the 2 nd portion 2f are configured to be detachable from each other. The 1 st portion 2c and the 2 nd portion 2f each have a substantially cylindrical shape as a whole. An external thread part 2d is provided on the front outer side of the 1 st part 2c, and a fitting part 2e is provided on the rear outer side of the 1 st part 2 c. The male screw portion 2d of the 1 st portion 2c is screwed into the female screw portion 3b of the front port 3, whereby the 1 st portion 2c is attached to the front port 3. A fitting portion 2g is provided on the front inner side of the 2 nd portion 2f, and an engaging portion 2h is provided on the rear inner side of the 2 nd portion 2 f. The 2 nd portion 2f is attached to the rear shaft 4 by engaging the engaging portion 2h of the 2 nd portion 2f with an engaging portion 4c provided on the front outer side of the rear shaft 4. The fitting portion 2e of the 1 st part 2c and the fitting portion 2g of the 2 nd part 2f are detachably fitted to each other. Thereby, the 1 st part 2c and the 2 nd part 2f are assembled with each other. With such a configuration, the mechanical pencil 1 according to the present modification can be divided into the front portion 1a and the rear portion 1b between the fitting portion 2e of the 1 st segment 2c and the fitting portion 2g of the 2 nd segment 2 f. In a state where the mechanical pencil 1 is divided into the front portion 1a and the rear portion 1b, the lead tank 8 opens rearward in the front portion 1 a.

The accessory holding member 6 extends in the axial direction through the rear shaft 4 and the inside of the 2 nd part 2f of the cylinder main body 2, and the front end of the accessory holding member 6 protrudes forward from the front end of the 2 nd part 2 f. The engaging projection 6e is provided on the outer surface of the accessory holding member 6, and the engaging projection 6e engages with the front end of the rear shaft 4, whereby the accessory holding member 6 can be prevented from being detached rearward from the rear shaft 4 and the cylinder main body 2. In the illustrated example, the tip of the accessory holding member 6 abuts the rear end of the refill can 8 in a state where the fitting portion 2e of the 1 st part 2c and the fitting portion 2g of the 2 nd part 2f of the barrel main body 2 are fitted to each other, that is, in a state where the front part 1a and the rear part 1b of the mechanical pencil 1 are assembled to each other.

The length of the refill abutting portion 15c of the display body 15 in the axial direction is set as follows: in a state where the indicator 15 is positioned at the forefront, the tip of the pen refill contact portion 15c of the indicator 15 does not protrude forward from the tip of the accessory holding member 6. In particular, in the example shown in fig. 13, in a state where the display body 15 is positioned at the forefront, the tip of the pen refill contact portion 15c of the display body 15 and the tip of the accessory holding member 6 are positioned at substantially the same position in the axial direction.

In the present modification, when the refill 9 (spare refill 91) is refilled into the refill tank 8, the mechanical pencil 1 is first divided into the front part 1a and the rear part 1b by separating the fitting part 2e of the 1 st part 2c and the fitting part 2g of the 2 nd part 2f of the shaft tube main body 2. Thereby, in the front portion 1a, the cartridge case 8 is opened rearward. Next, the refill 9 (spare refill 91) is inserted into the refill tank 8. Then, the front part 1a and the rear part 1b are assembled to each other by fitting the fitting portion 2e of the 1 st part 2c and the fitting portion 2g of the 2 nd part 2f of the shaft tube main body 2 to each other.

According to the mechanical pencil 1 of the present modification, even if the mechanical pencil 1 is divided into the front portion 1a and the rear portion 1b when the refill 9 (spare refill 91) is refilled into the refill tank 8, the tip of the refill contact portion 15c of the display body 15 does not protrude forward from the tip of the attachment holding member 6. Thus, when the refill 9 (the spare refill 91) is refilled into the refill tank 8, the refill abutting portion 15c is not exposed to the outside, and the refill abutting portion 15c, which is a relatively thin member, can be prevented from being bent or broken by coming into contact with another member. Further, when the refill 9 (spare refill 91) is replenished into the refill tank 8, the attachment holding member 6 does not need to be removed from the shaft, and therefore, the attachment holding member 6 removed from the shaft can be prevented from being damaged or lost.

Fig. 14A is a longitudinal sectional view showing a modification of the rear shaft 4 of the mechanical pencil 1, and fig. 14B is a transverse sectional view corresponding to the line C-C in fig. 14A, showing the rear shaft 4 in a state where the accessory holding member 6 is inserted into the rear shaft 4. The inner surface of the rear shaft 4 of the present modification is formed with: a cam portion 4d including a cam slope spirally extending in the axial direction and the circumferential direction along the inner surface; and an engagement groove 4e extending in the axial direction. In the illustrated example, two cam portions 4d are provided at 180 degrees apart in the circumferential direction, and two engagement grooves 4e are provided at 180 degrees apart in the circumferential direction. One cam portion 4d includes: a1 st cam slope 4d1 that is inclined to one side in the circumferential direction with respect to the axial direction and faces rearward; and a 2 nd cam slope 4d2 that is inclined rearward toward the other circumferential side with respect to the axial direction. The accessory holding member 6 has two engaging projections 6b spaced 180 degrees apart in the circumferential direction.

In the present modification, when the accessory holding member 6 is inserted into the rear axle 4 from behind, each engagement protrusion 6b of the accessory holding member 6 abuts against the 1 st cam inclined surface 4d1 or the 2 nd cam inclined surface 4d2 of the cam portion 4d and is guided toward each engagement groove 4 e. Therefore, even if the accessory holding member 6 is inserted into the rear shaft 4 without accurately aligning the engaging projections 6b with the engaging grooves 4e, the engaging projections 6b are smoothly engaged with the engaging grooves 4 e. Therefore, the attachment/detachment easiness of the accessory holding member 6 to/from the shaft tube is improved.

Fig. 15A and 15B are longitudinal sectional views showing still another modification of the mechanical pencil 1. In the present modification, a convex portion 6f is provided on the rear outer surface of the fitting portion 6a of the accessory holding member 6. The projection 6f is formed annularly along the circumferential direction. The outer diameter of the projection 6f is slightly larger than the minimum inner diameter (inner diameter of the front portion) of the rear shaft 4. Thus, when a large force is applied to the accessory holding member 6 in the axial direction by the user's operation, the projection 6f can pass through the minimum inner diameter portion (front portion) of the rear shaft 4, but when a relatively small force of the degree of the self weight of the cap 5, the accessory holding member 6, and the rubber 7 is applied, the projection cannot pass through the minimum inner diameter portion of the rear shaft 4. In a state where the fitting portion 6a of the accessory holding member 6 is completely inserted into the fitting portion 8a of the cartridge case 8 (see fig. 15A), the distance between the protruding portion 6f and the tip of the rear shaft 4 in the axial direction is longer than the length of the fitting portion 6a in the axial direction.

According to the mechanical pencil 1, even when the fitting portion 6a of the accessory holding member 6 and the fitting portion 8a of the lead can 8 are disengaged from each other by an impact such as dropping (see fig. 15B), the accessory holding member 6 can be prevented from being detached from the barrel. This prevents the spare cartridge 91 of the cartridge tank 8 from overflowing out of the cartridge tank 8. Further, the accessory holding member 6 detached from the shaft can be prevented from being lost.

In the modification described with reference to fig. 15A and 15B, a mark may be provided on the outer surface of the accessory holding member 6, and the mark may be invisible to the user in a state where the fitting portion 6a of the accessory holding member 6 is completely inserted into the fitting portion 8a of the cartridge case 8, and may be visible to the user in a state where the fitting portion 6a and the fitting portion 8a are not completely fitted. In this case, the user can see the indicator to recognize that the attachment of the accessory holding member 6 to the shaft tube is insufficient. The specific form of the mark portion is not particularly limited, but the mark portion may be formed as, for example, a linear projection, a linear recess, or a linear printed portion extending in the circumferential direction.

As another modification, the front surface and/or the back surface of the window portion 2b may have a polyhedral shape. For example, the front surface and/or the back surface of the window portion 2b may have a diamond-cut shape. This improves the appearance of the indicator 15, and makes it easy to see whether or not the refill 91 is present in the refill tank 8.

As still another modification, the display member 15 may be visible through the window 2b when the refill 91 is provided in the refill tank 8, and the inner wall surface of the refill tank 8 or the inner wall surface of the shaft may be visible through the window 2b when the refill 91 is not provided. In this case, it is preferable that the color of the inner wall surface of the cartridge case 8 or the inner wall surface of the shaft cylinder is made different from the display portion 15b of the display body 15 so as to be visually recognizable.

Claims (6)

1. A mechanical pencil having:

a shaft tube having a front end opening through which the refill protrudes and a rear end opening for replenishing the refill;

the refill can is arranged in the shaft cylinder;

a chuck located in front of the cartridge pot and linked with the cartridge pot;

a cartridge spring for applying a force to the cartridge and the cartridge tank in a rearward direction;

an accessory;

an accessory holding member that is located behind the cartridge case and holds the accessory; and

an operation portion located behind the accessory holding member and protruding from the rear end opening of the shaft tube,

the cartridge linked with the operation part is advanced by operating the operation part to feed out the pen core,

it is characterized in that the preparation method is characterized in that,

a display body which is in contact with a rear end of the refill housed in the refill tank is disposed in the barrel so as to be movable back and forth in an axial direction of the mechanical pencil, the display body which is in contact with a rear end of a spare refill is moved forward following the refill by moving the last refill in the refill tank forward, and the barrel is provided with a window portion through which a moving state of the display body can be visually confirmed from outside the barrel, the display body comprising: a cartridge abutting portion that is inserted into and removed from the cartridge tank and abuts against a rear end of the cartridge stored in the cartridge tank; and a display portion provided behind the lead abutting portion, wherein when the axial direction of the mechanical pencil is a vertical direction and the width of the display portion when the window portion is viewed from the front is X and the width of the lead abutting portion is Y, X and Y are in a relational expression of X > Y.

2. The mechanical pencil of claim 1,

the display body is movably provided to the accessory holding member, is positioned in the shaft tube and is movable forward and backward in the axial direction in a state where the accessory holding member is attached to the shaft tube or the cartridge case, and is also pulled out from the shaft tube by detaching the accessory holding member from the shaft tube or the cartridge case.

3. The mechanical pencil according to claim 1 or 2,

the window portion is obtained by forming a part of the shaft tube to be transparent or translucent.

4. The mechanical pencil according to any one of claims 1 to 3, wherein,

the display body is urged by an elastic member in the direction of the distal end opening of the shaft tube.

5. The mechanical pencil according to any one of claims 1 to 4, wherein,

the spare cartridge is capable of being retracted rearward from a state in which the cartridge abutting portion of the display body abuts against a rear end of the spare cartridge.

6. The mechanical pencil according to any one of claims 1 to 5, wherein,

when the display body is retracted to the maximum, the tip of the cartridge abutting portion is located in the cartridge tank.

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