JP7162626B2 - Writing implement with erasing member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a writing instrument having an erasing member, and more particularly to a writing instrument having an erasing member that rubs and erases handwriting made of thermochromic ink.

2. Description of the Related Art It is well known that, like a pencil with an eraser, a handwriting drawn on a paper surface or the like with a writing instrument can be erased by an erasing member provided in the writing instrument. In particular, thermochromic writing instruments containing thermochromic ink are known to have a configuration in which an erasing member is provided with a friction body that rubs handwriting to generate frictional heat (for example, Patent Documents 1 and 2).

The thermochromic writing instrument described in Patent Document 1 has a clip-shaped friction body, and the friction body is attached to the writing instrument body by fitting the inner surface of the mounting hole provided in the friction body to the rear outer surface of the writing instrument body. It is detachable.

The thermochromic writing instrument described in Patent Document 2 has a separate friction body provided at the tip of the clip, and the clip itself is detachable from the writing instrument main body.

Japanese Unexamined Patent Application Publication No. 2011-230448 JP 2012-096388 A

Since the friction body of the thermochromic writing instrument described in Patent Documents 1 and 2 is positioned on the side surface of the writing instrument body when attached to the writing instrument body, the length of the writing instrument body itself is sufficient to prevent the frictional movement during rubbing. There is a risk of obstruction. That is, there is a possibility that the friction body cannot be arranged at a user's desired position during rubbing.

In addition, the clip-shaped friction body described in Patent Document 1 or the friction body provided in the clip described in Patent Document 2 can be easily attached to and detached from the main body of the writing instrument. may be lost. As a result, handwriting cannot be erased, and the function of a clip cannot be fulfilled, so that the writing instrument cannot be tightly held in a pocket, a notebook, or the like, and there is a risk that convenience will be significantly reduced.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a writing instrument having an erasing member that prevents the erasing member from being lost and that allows the position of the erasing member to be easily adjusted during an erasing operation.

According to the invention of claim 1, a writing instrument body, a plurality of writing refills containing thermochromic ink and housed in the writing instrument body, and a first eraser disposed at the rear end of the writing instrument body. and a crown portion disposed at the rear end of the main body of the writing instrument, the crown portion covering the rear end surface of the first erasing member, and the crown portion having a larger thickness than the first erasing member. a clip formed with a small through hole and rotatable around an axis perpendicular to the central axis of the writing instrument body; and a second erasing member provided on the outer surface of the clip, An erasing member is provided in engagement with a front end side of the clip for gripping an article and a rear end side of the clip, and a rotating shaft of the clip is arranged on the rear end side. of writing instruments are provided.

According to the invention of claim 2, in the invention of claim 1, the crown portion is fitted to the rear end of the writing instrument main body, and the crown portion and the first erasing member are separated from each other. A writing instrument is provided, characterized in that a space is formed therebetween.

According to the third aspect of the invention, there is provided a writing instrument according to the first or second aspect of the invention, wherein the second erasing member is detachable from the clip.

That is, according to the first or third aspect of the invention, the erasing member is prevented from being lost, and the position of the erasing member can be easily adjusted during the erasing operation. Also, when the erasing member wears out due to use, it can be replaced with a new one. Furthermore, when the clip is rotated, the erasing member is positioned farthest from the grip of the writing instrument, so that the user can comfortably write without contact between the handle and the erasing member. When erasing, the user can easily erase while holding the clip.

In addition, the first erasing member or the second erasing member may be made of a rubber elastic material capable of thermally discoloring the handwriting of the thermochromic ink by frictional heat generated when rubbed.

According to the inventions described in the respective claims, it is possible to prevent loss of the erasing member and to easily adjust the position of the erasing member during the erasing operation.

1 is a front view of a writing instrument with an erasing member according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view taken along line AA of FIG. 1; FIG. (a) is a rear view of the clip base, and (b) is a cross-sectional view of the clip base taken along line BB in (a). (a) is a front view of the clip fixing body, and (b) is a cross-sectional view of the clip fixing body taken along line CC in (a). (a) is a front view of a leaf spring, and (b) is a cross-sectional view of the leaf spring taken along line DD in (a). 2 is a view showing a state in which the clip of the writing instrument shown in FIG. 1 is rotated 90 degrees; FIG. 2 is a view showing a state in which the clip of the writing instrument shown in FIG. 1 is rotated 180 degrees; FIG. Fig. 10 is a front view of a writing instrument with an erasing member according to a second embodiment of the present invention; FIG. 9 is a cross-sectional view taken along line EE of FIG. 8; Figure 9 is a perspective view of the erasing member shown in Figure 8; FIG. 10 is a front view of a writing instrument with an erasing member according to a third embodiment of the present invention; FIG. 12 is a cross-sectional view taken along line FF of FIG. 11; Figure 12 is a perspective view of the erasing member shown in Figure 11; FIG. 10 is a front view of a writing instrument with an erasing member according to a fourth embodiment of the present invention; FIG. 15 is a cross-sectional view taken along line GG of FIG. 14; (a) is a perspective view of the erasing member shown in FIG. 11, and (b) is a bottom view of the erasing member shown in FIG. 12 is a front view of a clip body of the writing instrument shown in FIG. 11; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding elements are provided with common reference numerals throughout the drawings.

FIG. 1 is a front view of a writing instrument 1 with an erasing member 50 according to a first embodiment of the invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

The writing instrument 1 has a clip 10 , a clip fixing body 20 , a leaf spring 30 and a writing instrument main body 40 . The writing instrument main body 40 has a tip 41 , a front barrel 42 having the tip 41 at its tip, a rear barrel 43 , and a crown portion 44 fitted to the rear end of the rear barrel 43 . The writing instrument 1 rotates the front barrel 42 and the rear barrel 43 relative to each other so that a writing refill (not shown) accommodated in the writing instrument main body 40 is inserted into an opening provided at the tip of the tip 41, that is, the writing tip. It is a rotating feeding type writing instrument that is fed out from 41a.

A plurality of writing refills can also be accommodated within the writing instrument body 40 . The writing refill includes a ballpoint pen containing thermochromic ink, a mechanical pencil containing a thermochromic core, a pencil holder, and the like. In this specification, in the axial direction of the writing instrument 1, the side of the writing tip 41a is defined as the "front" side, and the side opposite to the writing tip is defined as the "rear" side.

The clip 10 has a clip base 11 and a clip body 12 . The clip base 11 and the clip main body 12 are pivotally connected by a pin 13 , and a coil spring 14 is arranged between the clip base 11 and the clip main body 12 behind the connecting portion by the pin 13 . The coil spring 14 urges the clip body 12 in a direction away from the clip base 11 . As a result, the clip body 12 pivots about the pin 13 and the front end of the clip body 12 is biased against the clip base 11 . Therefore, an article such as paper can be held between the clip base 11 and the clip main body 12 .

The clip 10 in this embodiment is composed of a plurality of members such as the clip base 11, the clip main body 12, and the coil spring 14. The clip 10 is opened forward as a whole so as to clamp an article using members having elasticity. It may be formed as one part with a substantially U-shape.

In this embodiment, an erasing member 50 is provided at the tip of the clip body 12 by two-color molding. The erasing member 50 may be integrally formed by adhesion or the like other than two-color molding. As long as the erasing member 50 is provided on the outer surface of the clip body 12, half or all of the clip body 12 as well as the tip is formed of the erasing member 50. You may Similarly, an erasing member 50 may be provided at the rear end portion of the clip body 12 .

The writing instrument 1 is configured so that the clip 10 can rotate around a rotation axis R perpendicular to the central axis of the writing instrument main body 40 . This rotation mechanism will be described with reference to FIGS. 3 and 4. FIG.

3, (a) is a rear view of the clip base 11, and (b) is a cross-sectional view of the clip base 11 taken along line BB in (a). On the rear surface of the clip base portion 11 , that is, behind the surface facing the writing instrument body 40 , an insertion shaft 17 projecting perpendicularly to the rear surface of the clip base portion 11 is formed. A flange portion 16 is formed at the distal end portion of the insertion shaft 17 . The diameter of the flange portion 16 is formed larger than the diameter of the insertion shaft 17 . Furthermore, a plurality of radially extending projections 18 are formed on the rear surface of the clip base 11 at the base of the insertion shaft 17 and fitted with recesses 23 provided in the clip fixing body 20 described later. The protrusions 18 are formed evenly in the circumferential direction at intervals of 90 degrees.

4, (a) is a front view of the clip fixing body 20, and (b) is a sectional view of the clip fixing body 20 taken along the line CC in (a). The clip fixing body 20 is a ring-shaped member attached to the rear barrel 43 by making the outer diameter of the rear barrel 43 the inner diameter. The clip base 11 is rotatably connected to the clip fixing body 20 , thereby rotatably connecting the clip 10 to the writing instrument main body 40 .

A clip support box 21 is formed on one side of the clip fixing body 20 . A leaf spring receiving space 21a is formed inside the clip support box 21, and an insertion hole 22, a recess 23, and a stopper portion 24 are formed on the outer surface of the clip support box 21. As shown in FIG. As will be described later, the leaf spring 30 is inserted into the leaf spring receiving space 21 a , and the insertion shaft 17 and the flange portion 16 of the clip base 11 are inserted into the insertion hole 22 .

More specifically, a plurality of radially extending recesses 23 are provided around the insertion hole 22, and the recesses 23 are evenly formed at intervals of 45 degrees in the circumferential direction. The space between the adjacent recesses 23 is convex, and when the clip 10 rotates, the protrusions 18 provided on the clip body 12 are disengaged from the fitting recesses 23 and ride on the adjacent protrusions. At this time, the movement of the clip body 12 in the front-rear direction is restricted by the stopper portion 24 provided in the recess 23 in the front-rear direction. In addition, this stopper part 24 may be one of the front and the rear.

A rear bearing receiving space 21b is formed inside the clip fixing body 20, and a fitting portion 25 for the rear shaft 43 is formed in this space. The clip fixture 20 is fixed to the rear shaft 43 by fitting the fitting portion 25 to the rear portion of the rear shaft 43 .

In addition to the erasing member 50 provided on the clip 10 , a further erasing member 60 may be arranged in the housing 26 behind the clip fixture 20 .

5A is a front view of the leaf spring 30, and FIG. 5B is a cross-sectional view of the leaf spring 30 taken along line DD of FIG. 5A. A plate spring 30 made of an elastic member is formed with a plate spring slit 31 having an open portion 35 with one end opened at the center thereof. A concave surface 34 and a convex surface 33 are formed along the direction of the leaf spring slit 31 . Concave surfaces 34 are formed on both sides of convex surface 33 . Furthermore, a retaining portion 32 is formed at a position opposite to the opening portion 35 . The plate spring 30 can be prevented from coming off by bringing the rear end face of the retaining portion 32 into contact with another member. In this embodiment, as shown in FIG. 2, the plate spring 30 is prevented from coming off by contacting the rear shaft 43 .

Next, a method for assembling the writing instrument 1 will be described. First, the flange portion 16 provided on the rear surface of the clip base portion 11 of the clip 10 and the insertion shaft 17 are inserted through the insertion hole 22 of the clip fixing body 20 . Next, the leaf spring 30 is inserted into the leaf spring receiving space 21a between the flange portion 16 and the clip fixing body 20, with the convex surface 33 side of the leaf spring 30 directed toward the flange portion 16 side. At this time, the insertion shaft 17 is passed through the plate spring slit 31 from the open portion 35 side of the plate spring slit 31 of the plate spring 30 . In this state, the retaining portion 32 of the leaf spring 30 and the rear shaft 43 are in contact with each other, so that the leaf spring 30 is prevented from coming off.

Further, since the leaf spring 30 has the convex surface 33 and the concave surface 34 , it generates a biasing force that resists the force in the direction in which the clip 10 is pulled out of the clip fixing body 20 . That is, when a force acts on the clip 10 in a direction to remove it from the clip fixing body 20, the convex surface 33 and the concave surface 34 of the leaf spring 30 are deformed so that the irregularities are eliminated, but an elastic force is generated to restore the deformation. do. This elastic force acts on the flange portion 16 penetrating the leaf spring 30 through the leaf spring slit 31 , resulting in an urging force that resists the force in the direction in which the clip 10 is removed from the clip fixing body 20 .

The writing instrument 1 assembled as described above can rotate the clip 10 with respect to the writing instrument main body 40 . The rotation of the clip 10 is performed around the axis of the insertion shaft 17 of the clip base 11 , that is, around the rotation axis R perpendicular to the central axis of the writing instrument main body 40 . When the clip 10 is rotated, as described above, the projection 18 formed on the back surface of the clip base 11 and the recess 23 formed on the clip fixing body 20 are disengaged from each other against the biasing force of the leaf spring 30 . , will be able to rotate freely. When the clip 10 rotates by a predetermined angle, the protrusions 18 of the clip base 11 are engaged with different recesses 23 by the biasing force of the plate spring 30, and the rotation of the clip stops.

6 is a diagram showing a state in which the clip of the writing instrument 1 shown in FIG. 1 is rotated by 90 degrees, and FIG. 7 shows a state in which the clip of the writing instrument 1 shown in FIG. 1 is rotated by 180 degrees. It is a diagram. As a matter of course, the circumferential arrangement intervals between the plurality of protrusions 18 of the clip base 11 and the plurality of recesses 23 of the clip support box 21 may be different from the above-described embodiment.

The writing refill of the writing instrument 1 in this embodiment contains thermochromic ink. Thermochromic ink maintains a predetermined color (first color) at room temperature (eg, 25° C.) and changes to another color (second color) when heated to a predetermined temperature (eg, 60° C.). It is an ink that returns to its original color (first color) when cooled to a predetermined temperature (for example, −5° C.). In the writing instrument 1 using the thermochromic ink, the second color is made colorless, and the drawing line drawn with the first color (for example, red) is heated to become colorless. . Therefore, in the embodiment, the erasing member 50 as a friction body rubs against the paper surface or the like on which the drawn line is written to generate frictional heat, thereby making the drawn line colorless, that is, erasing it. It should be noted that, as a matter of course, the second color may be colored other than colorless.

As a material for forming the erasing member 50 as a friction body, rubber materials such as silicone rubber, nitrile rubber, ethylene propylene rubber, and ethylene propylene diene rubber, and thermoplastic elastomers such as styrene elastomers, olefin elastomers, and polyester elastomers are used. Examples include elastic materials, mixtures of two or more rubber elastic materials, mixtures of rubber elastic materials and synthetic resins, commercially available erasers, and the like.

Materials for forming the clip base 11, the clip main body 12, and the clip fixing body 20 include synthetic resins such as polycarbonate and acrylonitrile-butadiene-styrene.

The term "erasing" in the present invention refers to sucking or scraping off drawn lines, characters, etc., with an erasing member 50 such as an eraser, in addition to the case of using the thermochromic ink. Therefore, the above-described and following embodiments of the present invention are applicable to any writing instrument that erases a drawn line using the erasing member 50 .

According to the writing instrument 1 of the present embodiment, the clip main body 12 and the erasing member 50 are integrated, and the clip main body 12 is connected to the clip base 11 by the pin 13, so that the erasing member 50 is not lost. has the advantage of preventing Further, since the clip 10 is rotatable with respect to the writing instrument main body 40, there is an advantage that the position of the erasing member 50 can be easily adjusted during the erasing operation. Furthermore, when the clip 10 is rotated, the erasing member 50 is positioned farthest from the grip of the writing instrument, so that the user can comfortably write without contact between the handle and the erasing member 50. and can be easily erased while holding the clip 10 at the time of erasing.

8 is a front view of a writing instrument 100 with an erasing member 150 according to a second embodiment of the invention, FIG. 9 is a cross-sectional view taken along line EE of FIG. 8, and FIG. Fig. 2 is a perspective view of the erasing member 150 shown; The writing instrument 100 has a clip 110 , a clip fixing body 20 , a leaf spring 30 and a writing instrument main body 40 . The writing instrument 100 differs from the writing instrument 1 provided with the erasing member 50 according to the first embodiment only in the shape of the clip body and the shape of the erasing member, and both are identical in other respects.

The clip 110 has a clip base 11 and a clip body 112 . A through hole 112a is formed at the tip of the clip body 112, and an erasing member 150 is attached to the through hole 112a.

The erasing member 150 has an erasing portion 151, a locking flange portion 152, and a connection shaft 153 connecting the erasing portion 151 and the locking flange portion 152, which are integrally formed. The erasing member 150 is attached to the clip body 112 by press-fitting the locking flange portion 152 into the through hole 112 a from the outer surface side of the clip body 112 . The axial length of the connecting shaft 153 is set equal to the thickness of the clip body 112, so that the erasing member 150 can be attached to the clip body 112 without loosening.

The materials of the erasing member 150 and the clip body 112 are the same as those of the erasing member 50 and the clip body 12 according to the first embodiment, respectively. The erasing portion 151 of the erasing member 150 according to the present embodiment has a hemispherical shape, but may have any other shape. Also, the erasing portion 151, the locking flange portion 152, and the connecting shaft 153 may be formed as separate members.

According to the writing instrument 100 of the present embodiment, in addition to the advantages obtained by the writing instrument 1 of the first embodiment described above, there is a further advantage that the erasing member 150 can be replaced with a new one when it wears out due to use. .

11 is a front view of a writing instrument 200 with an erasing member 250 according to a third embodiment of the invention, FIG. 12 is a cross-sectional view taken along line FF of FIG. 11, and FIG. Fig. 12 is a perspective view of the erasing member 250 shown; The writing instrument 200 has a clip 210 , a clip fixing body 20 , a leaf spring 30 and a writing instrument main body 40 . The writing instrument 200 differs from the writing instrument 1 having the erasing member 50 according to the first embodiment only in the shape of the clip body and the shape of the erasing member, and both are identical in other respects.

The clip 210 has a clip base 11 and a clip body 212 . A separate erasing member 250 is attached to the outer surface of the clip body 212 to cover the entirety thereof. The erasing member 250 is an elongated member having a first locking claw portion 250a and a second locking claw portion 250b at both ends. The erasing member 250 is attached to the clip body 212 by engaging the front and rear end portions of the clip body 212 with the first locking claw portion 250a and the second locking claw portion 250b.

The materials of the erasing member 250 and the clip body 212 are the same as those of the erasing member 50 and the clip body 12 according to the first embodiment, respectively. Although the overall shape of the erasing member 250 according to this embodiment is rectangular, it may be formed in other shapes such as a curved shape.

According to the writing instrument 200 of the present embodiment, in addition to the advantages obtained by the writing instrument 1 of the first embodiment described above, there is a further advantage that the erasing member 250 can be replaced with a new one when it wears out due to use. .

14 is a front view of a writing instrument 300 having an erasing member 350 according to a fourth embodiment of the present invention, FIG. 15 is a cross-sectional view taken along line GG of FIG. 14, and FIG. 16 is (a). 11 is a perspective view of the erasing member 350 shown in FIG. 11, (b) is a bottom view of the erasing member 350 shown in FIG. 11, and FIG. 17 is a clip body of the writing instrument 300 shown in FIG. 312 is a front view of FIG.

The writing instrument 300 has a clip 310 , a clip fixing body 20 , a leaf spring 30 and a writing instrument main body 40 . The writing instrument 300 differs from the writing instrument 1 having the erasing member 50 according to the first embodiment only in the shape of the clip body and the shape of the erasing member, and both are the same in other respects.

Clip 310 has clip base 11 and clip body 312 . A key-shaped through-hole 312a is formed in the clip body 312, and an erasing member 350 is attached to the key-shaped through-hole 312a. As will be described later, the key-shaped through hole 312a has an axially asymmetric shape that allows passage of the engaging flange portion 352 and the connecting shaft 353 only when the erasing member 350 is attached in a predetermined posture.

The erasing member 350 has an erasing portion 351, a locking flange portion 352, and a connection shaft 353 connecting the erasing portion 351 and the locking flange portion 352, which are integrally formed. The erasing portion 351 has a flat top portion 351a, two curved surface portions 351b, which are convex side surfaces arranged opposite to each other, and a ridgeline portion 351c smoothly connecting the curved surface portions 351b.

The connecting shaft 353 has a circular cross-sectional shape, while the locking flange portion 352 has a substantially rectangular cross-sectional shape. The length of the long side of the locking flange portion 352 is formed larger than the diameter of the connection shaft 353 . The shape and size of the locking flange portion 352 and the connection shaft 353 of the erasing member 350 projected in the axial direction of the connection shaft 353 are determined so as to be included in the key-shaped through hole 312 a of the clip body 312 . The locking flange portion 352 is arranged so that its longitudinal direction is perpendicular to the longitudinal direction of the erasing member 350 .

The erasing member 350 inserts the locking flange portion 352 and the connection shaft 353 into the key-shaped through hole 312a by pressing the erasing portion 351 in a state in which the longitudinal direction thereof is perpendicular to the longitudinal direction of the clip body 312. can be attached to the clip body 312 . The installation is then completed by rotating the erasing member 350 90 degrees. The axial length of the connecting shaft 353 is set equal to the thickness of the clip body 312, so that the erasing member 350 can be attached to the clip body 312 without loosening. As a matter of course, the cross-sectional shapes of the locking flange portion 352 and the connecting shaft 353 facing the key-shaped through hole 312a may be different shapes as long as the same purpose can be achieved.

The materials of the erasing member 350 and the clip body 312 are the same as those of the erasing member 50 and the clip body 12 according to the first embodiment, respectively. The erasing portion 351 of the erasing member 350 according to this embodiment may have any other shape. Also, the erasing portion 351, the locking flange portion 352, and the connection shaft 353 may be formed as separate members.

According to the writing instrument 300 of this embodiment, in addition to the advantages obtained by the writing instrument 1 of the first embodiment described above, there is a further advantage that the erasing member 350 can be replaced with a new one when it wears out due to use. . Moreover, since the clip main body 312 has the key-shaped through hole 312a, there is an advantage that the erasing member 350 does not easily come off. Furthermore, since the erasing member 350 has the top portion 351a, the curved surface portion 351b, and the ridgeline portion 351c, there is also the advantage that the user can freely select the portion to be rubbed according to the area and shape to be erased. .

1 writing instrument 10 clip 20 clip fixing body 30 plate spring 40 writing instrument main body 50 erasing member R rotation axis

Claims (2)

a writing instrument body, a plurality of writing refills containing thermochromic ink and housed in the writing instrument body, a clip arranged in the writing instrument body, a first erasing member arranged behind the clip; a second erasing member provided on the outer surface of the clip;
The first erasing member and the second erasing member are made of a rubber elastic material capable of thermally discoloring the handwriting of the thermochromic ink by frictional heat generated when rubbed,
The second erasing member is detachable from the clip, the clip is formed with a key-shaped through-hole, and the second erasing member is a connecting shaft that can be inserted into the key-shaped through-hole. and a locking flange portion , and the key-shaped through hole is shaped to allow passage of the connection shaft and the locking flange portion only when the second erasing member is attached in a predetermined posture. The shape and size of the key-shaped through-hole are determined so as to correspond to the shape and size of the connection shaft and the locking flange projected in the axial direction of the connection shaft. Retractable writing instrument. a writing instrument body, a plurality of writing refills containing thermochromic ink and housed in the writing instrument body, a clip arranged in the writing instrument body, a first erasing member arranged behind the clip; a second erasing member provided on the outer surface of the clip;
The first erasing member and the second erasing member are made of a rubber elastic material capable of thermally discoloring the handwriting of the thermochromic ink by frictional heat generated when rubbed,
The second erasing member is provided with a first engaging portion and a second engaging portion, and by engaging the first engaging portion and the second engaging portion with the clip, the second erasing member is a member attached to the clip;
The second erasing member is an elongated member having a first locking claw portion and a second locking claw portion at both ends ,
A retractable writing instrument , wherein the second erasing member is attached by engaging the first locking claw portion and the second locking claw portion with front and rear end portions of the clip. .

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