JP2020073346A - Writing instrument having erasing member - Google Patents

Abstract

To provide a writing instrument having an erasing member that prevents loss of the erasing member and makes it easier to adjust the position of the erasing member during an erasure operation.SOLUTION: A writing instrument 1 includes: a writing instrument body 40; a clip 10 rotatable around an axis R perpendicular to a central axis of the writing instrument body; and an erasing member 50 disposed on an external surface of the clip. The writing instrument 1 is a thermochromic writing instrument storing thermochromic ink. The erasing member 50 is formed of a rubber elastic material that allows a handwriting of the thermochromic ink to be thermally discolored by frictional heat generated upon scratching.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing instrument provided with an erasing member, and more particularly to a writing instrument provided with an erasing member that rubs and erases a handwriting of thermochromic ink.

  It is well known that, like a pencil with an eraser, a handwriting drawn on a paper surface by a writing instrument can be erased by an erasing member provided in the writing instrument. In particular, a thermochromic writing instrument containing a thermochromic ink is known to have a configuration including a friction body that scrapes a handwriting to generate frictional heat as an erasing member (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. In contrast, it is removable.

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

JP, 2011-230448, A JP, 2012-096388, A

  The friction body of the thermochromic writing instrument described in Patent Documents 1 and 2 is located on the side surface of the writing instrument body when attached to the writing instrument body, so that the length of the writing instrument body itself is May hinder. That is, at the time of rubbing, there is a possibility that the friction body cannot be arranged at the position desired by the user.

  Further, the clip-shaped friction body described in Patent Document 1 or the friction body provided in the clip described in Patent Document 2 is easily detachable from the writing instrument main body, and therefore is unintentionally detached. May be lost. As a result, not only the handwriting cannot be erased, but also the function of the clip cannot be fulfilled, so that the writing instrument cannot be held in a pocket, a notebook or the like, and the convenience may be significantly reduced.

  Therefore, an object of the present invention is to provide a writing instrument that includes an erasing member that can prevent the erasing member from being lost and that can easily adjust the position of the erasing member during an erasing operation.

  According to the invention of claim 1, a writing instrument main body, a plurality of writing refills containing thermochromic ink and contained in the writing instrument main body, and a first erasing arranged at a rear end of the writing instrument main body. A member and a crown portion arranged at the rear end of the writing instrument main body, the crown portion covering the rear end surface of the first erasing member, and the crown portion being more than the first erasing member. A clip having a small through hole formed therein, rotatable about an axis perpendicular to a central axis of the writing instrument main body; and a second erasing member provided on an 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 rotation shaft of the clip is arranged at a rear end side thereof. Writing instruments are provided.

  According to a second aspect of the present invention, in the first aspect of the invention, the crown portion is fitted to the rear end of the writing instrument body, and the crown portion and the first erasing member are formed. Provided is a writing instrument characterized in that a space is formed therebetween.

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

  That is, in the invention described in claim 1 or 3, loss of the erasing member can be prevented, and the position of the erasing member during the erasing operation can be easily adjusted. Also, when the erasing member is worn out by use, it can be replaced with a new one. Furthermore, when the clip is rotated, the erasing member is located at the position farthest from the grip of the writing instrument, so that the user's hand and the erasing member can be comfortably written without contact. When erasing, the clip can be easily erased while holding the clip.

  The first erasing member or the second erasing member may be made of a rubber elastic material capable of thermally changing the handwriting of the thermochromic ink by frictional heat generated when rubbing.

  According to the invention described in each claim, there is a common effect that the loss of the erasing member is prevented and the position of the erasing member during the erasing operation can be easily adjusted.

1 is a front view of a writing instrument provided with an erasing member according to a first embodiment of the present invention. It is sectional drawing in line AA of FIG. (A) is a rear view of the clip base, (b) is a cross-sectional view of the clip base taken along line BB of (a). (A) is a front view of a clip fixing body, (b) is a sectional view of the clip fixing body along line C-C of (a). (A) is a front view of a leaf spring, (b) is a sectional view of the leaf spring taken along the line DD of (a). It is a figure which shows the state which rotated the clip of the writing instrument shown in FIG. 1 by 90 degrees. It is a figure which shows the state which rotated the clip of the writing instrument shown in FIG. 1 180 degrees. It is a front view of a writing instrument provided with an erasing member according to a second embodiment of the present invention. 9 is a cross-sectional view taken along the line EE in FIG. 8. 9 is a perspective view of the erasing member shown in FIG. 8. FIG. It is a front view of a writing instrument provided with an erasing member according to a third embodiment of the present invention. It is sectional drawing in line FF of FIG. FIG. 12 is a perspective view of the erasing member shown in FIG. 11. It is a front view of a writing instrument provided with an erasing member according to a fourth embodiment of the present invention. It is sectional drawing in line GG of FIG. 11A is a perspective view of the erasing member shown in FIG. 11, and FIG. 11B is a bottom view of the erasing member shown in FIG. 11. FIG. 12 is a front view of a clip body of the writing instrument shown in FIG. 11.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are designated by common reference numerals throughout the drawings.

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

  The writing instrument 1 includes a clip 10, a clip fixing body 20, a leaf spring 30, and a writing instrument body 40. The writing instrument main body 40 has a front opening 41, a front shaft 42 having the front opening 41 at its tip, a rear shaft 43, and a crown portion 44 fitted to the rear end of the rear shaft 43. The writing instrument 1 has a writing refill (not shown) housed in the writing instrument body 40 by rotating the front shaft 42 and the rear shaft 43 relative to each other. It is a rotary feeding type writing instrument fed from 41a.

  Further, a plurality of writing refills can be accommodated in the writing instrument main body 40. Examples of the writing refill include a ballpoint pen containing a thermochromic ink, a mechanical pencil containing a thermochromic core, and a pencil holder. In the present specification, in the axial direction of the writing instrument 1, the writing tip portion 41a side is defined as the “front” side, and the side opposite to the writing tip portion 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 disposed between the clip base 11 and the clip main body 12 rearward of the connecting portion by the pin 13. The coil spring 14 biases the clip body 12 in a direction away from the clip base 11. As a result, the clip body 12 pivots around 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 body 12.

  The clip 10 in the present embodiment is composed of a plurality of members such as the clip base 11, the clip body 12, and the coil spring 14, but is opened forward as a whole so as to sandwich an article using an elastic member. It may be formed as one component having a substantially U shape.

  In the present embodiment, the 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 the two-color molding. As long as it is provided on the outer surface of the clip body 12, not only the tip but also half or all of the clip body 12 is formed by the erasing member 50. You may. Similarly, the erasing member 50 may be provided at the rear end portion of the clip body 12.

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

  3A is a rear view of the clip base 11, and FIG. 3B is a cross-sectional view of the clip base 11 taken along the line BB of FIG. An insertion shaft 17 that projects perpendicularly to the back surface of the clip base 11 is formed on the back surface of the clip base 11, that is, behind the surface facing the writing instrument body 40. A flange portion 16 is formed at the tip of the insertion shaft 17. The diameter of the flange portion 16 is formed larger than the diameter of the insertion shaft 17. Further, on the back surface of the clip base portion 11, which is the root of the insertion shaft 17, are formed a plurality of convex portions 18 that extend in the radial direction and fit into concave portions 23 provided in a clip fixing body 20 described later. The convex portions 18 are evenly formed in the circumferential direction at intervals of 90 degrees.

  4A is a front view of the clip fixing body 20, and FIG. 4B is a cross-sectional view of the clip fixing body 20 taken along the line C-C in FIG. 4A. The clip fixing body 20 is a ring-shaped member that is attached to the rear shaft 43 by setting the outer diameter dimension of the rear shaft 43 to the inner diameter dimension. The clip base 11 is rotatably connected to the clip fixing body 20, and thereby the clip 10 is rotatably connected to the writing instrument body 40.

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

  More specifically, a plurality of recesses 23 extending in the radial direction are provided around the insertion hole 22, and the recesses 23 are evenly formed in the circumferential direction at intervals of 45 degrees. The space between the adjacent concave portions 23 is convex, and when the clip 10 rotates, the convex portion 18 provided on the clip body 12 disengages from the fitted concave portion 23 and rides on the adjacent convex portion. 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 front-rear direction of the recess 23. It should be noted that the stopper portion 24 may be one of the front and rear.

  A rear bearing receiving space 21b is formed inside the clip fixing body 20, and a fitting portion 25 with the rear shaft 43 is formed in this space. By fitting the fitting portion 25 with the rear portion of the rear shaft 43, the clip fixing body 20 is fixed to 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 storage portion 26 behind the clip fixing body 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 D-D of FIG. The leaf spring 30 made of an elastic member has a leaf spring slit 31 formed at the center thereof with an open portion 35 having one end opened. Further, a concave surface 34 and a convex surface 33 are formed along the direction of the leaf spring slit 31. The concave surface 34 is formed on both sides of the convex surface 33. Further, a retaining portion 32 is formed at a position opposite to the opening portion 35. The leaf spring 30 can be prevented from coming off by bringing the rear end surface of the coming-off preventing portion 32 into contact with another member. In the present embodiment, the leaf spring 30 is prevented from coming off by abutting against the rear shaft 43 as shown in FIG.

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

  Further, since the leaf spring 30 has the shapes of the convex surface 33 and the concave surface 34, it exerts an urging force against the force in the direction in which the clip 10 comes off the clip fixing body 20. That is, when a force is applied to the clip 10 in the direction of coming out of the clip fixing body 20, the leaf spring 30 is deformed so as to eliminate the unevenness of the convex surface 33 and the concave surface 34, but an elastic force for returning it is generated. To do. This elastic force acts on the flange portion 16 penetrating the leaf spring 30 through the leaf spring slit 31, and as a result, an urging force that resists the force in the direction in which the clip 10 comes off the clip fixing body 20 is generated.

  The writing instrument 1 assembled as described above can rotate the clip 10 with respect to the writing instrument body 40. The clip 10 is rotated about the axis of the insertion shaft 17 of the clip base 11, that is, about the rotation axis R perpendicular to the central axis of the writing instrument body 40. When the clip 10 is rotated, as described above, the fitting between the convex portion 18 formed on the back surface of the clip base 11 and the concave portion 23 formed on the clip fixing body 20 is released 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 convex portion 18 of the clip base 11 fits into the different concave portion 23 due to the biasing force of the leaf spring 30, and the rotation of the clip is stopped.

  FIG. 6 is a view showing a state where the clip of the writing instrument 1 shown in FIG. 1 is rotated by 90 degrees, and FIG. 7 is a state where the clip of the writing instrument 1 shown in FIG. 1 is rotated by 180 degrees. It is a figure. As a matter of course, the arrangement intervals in the circumferential direction of 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 those in the above-described embodiments.

  The writing refill of the writing instrument 1 in the present embodiment contains thermochromic ink. Thermochromic ink is a color that maintains a predetermined color (first color) at room temperature (for example, 25 ° C.) and changes to another color (second color) when heated to a predetermined temperature (for example, 60 ° C.). After that, when cooled to a predetermined temperature (for example, −5 ° C.), the ink has a property of returning to the original color (first color) again. In the writing instrument 1 using the thermochromic ink, the second color is made colorless, and the drawing line drawn in the first color (for example, red) is heated to make it colorless, which is referred to as “erasing” here. .. Therefore, in the embodiment, the erasing member 50 as a friction body rubs against the paper surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line to colorless, that is, erasing. Of course, the second color may be a color other than colorless.

  As a material for forming the erasing member 50 as a friction body, a rubber material such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber, or a rubber such as styrene elastomer, olefin elastomer, polyester elastomer or the like thermoplastic elastomer. 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.

  As a material for forming the clip base portion 11, the clip body 12, and the clip fixing body 20, synthetic resins such as polycarbonate, acrylonitrile-butadiene-styrene, etc. may be mentioned.

  The term "erasing" in the present invention means that the drawn lines, characters and the like written on the ink are adsorbed or scraped off by an erasing member 50 such as an eraser other than when the thermochromic ink is used. Therefore, the above-described embodiment and the following embodiments of the present invention can be applied to any writing tool that erases a drawn line using the erasing member 50.

  According to the writing instrument 1 of this embodiment, since the clip body 12 and the erasing member 50 are integrated and the clip body 12 is connected to the clip base 11 by the pin 13, the erasing member 50 is lost. Has the advantage of being prevented. 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 during the erasing operation can be easily adjusted. Further, when the clip 10 is rotated, the erasing member 50 is located at a position farthest from the grip of the writing instrument, so that the user's handle and the erasing member 50 do not come into contact with each other, and writing can be performed comfortably. In addition, the clip 10 can be easily erased while gripping it when erasing.

  8 is a front view of the writing instrument 100 including the erasing member 150 according to the second embodiment of the present invention, FIG. 9 is a sectional view taken along line EE of FIG. 8, and FIG. 10 is shown in FIG. 6 is a perspective view of the eraser member 150 shown. FIG. The writing instrument 100 includes a clip 110, a clip fixing body 20, a leaf spring 30, and a writing instrument body 40. The writing instrument 100 differs from the writing instrument 1 including 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 the other points are the same.

  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 connecting shaft 153 connecting the erasing portion 151 and the locking flange portion 152, and these are integrally formed. The erasing member 150 is attached to the clip body 112 by pressing the locking flange portion 152 into the through hole 112a from the outer surface side of the clip body 112. The axial length of the connecting shaft 153 is set to be equal to the thickness of the clip body 112, so that the erasing member 150 is 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. Although the erasing portion 151 of the erasing member 150 according to the present embodiment has a hemispherical shape, it may have any other shape. Further, 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 when the erasing member 150 is worn by use, it can be replaced with a new one. ..

  11 is a front view of a writing instrument 200 including an erasing member 250 according to the third embodiment of the present invention, FIG. 12 is a cross-sectional view taken along line FF of FIG. 11, and FIG. 13 is shown in FIG. 4 is a perspective view of the eraser member 250 shown. FIG. The writing instrument 200 includes a clip 210, a clip fixing body 20, a leaf spring 30, and a writing instrument body 40. The writing instrument 200 differs from the writing instrument 1 including 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 the other points are the same.

  The clip 210 has a clip base 11 and a clip body 212. On the outer surface of the clip body 212, a separate erasing member 250 that covers the entire body is attached. 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 first locking claw portion 250a and the second locking claw portion 250b with the front and rear ends of the clip body 212.

  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 entire shape of the erasing member 250 according to the present 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 when the erasing member 250 is worn by use, it can be replaced with a new one. ..

  FIG. 14 is a front view of a writing instrument 300 including an erasing member 350 according to the 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. 11. It is a front view of 312.

  The writing instrument 300 includes a clip 310, a clip fixing body 20, a leaf spring 30, and a writing instrument body 40. The writing instrument 300 differs from the writing instrument 1 including 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 the other points are the same.

  The clip 310 has a clip base 11 and a 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 the locking flange portion 352 and the connecting shaft 353 to pass 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 connecting shaft 353 connecting the erasing portion 351 and the locking flange portion 352, and these are integrally formed. The erasing portion 351 has two curved surface portions 351b, which are convex side surfaces arranged to face the flat top portion 351a, and a ridge portion 351c that smoothly connects 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 to be larger than the diameter of the connecting shaft 353. The shape and size of the engagement flange portion 352 of the erasing member 350 and the connection shaft 353 projected in the axial direction of the connection shaft 353 are determined so as to be included in the key-shaped through hole 312a of the clip body 312. Further, the locking flange portion 352 is arranged such that its longitudinal direction is perpendicular to the longitudinal direction of the erasing member 350.

  The erasing member 350 presses the erasing portion 351 in a state where the longitudinal direction of the erasing portion 351 is perpendicular to the longitudinal direction of the clip body 312, thereby inserting the locking flange portion 352 and the connecting shaft 353 into the key-shaped through hole 312a. Can be attached to the clip body 312. Then, the erasing member 350 is rotated 90 degrees to complete the attachment. The axial length of the connecting shaft 353 is set to be equal to the thickness of the clip body 312, so that the erasing member 350 is 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 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 the present embodiment may have any other shape. Further, the erasing portion 351, the locking flange portion 352, and the connecting shaft 353 may be formed as separate members.

  According to the writing instrument 300 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 when the erasing member 350 is worn by use, it can be replaced with a new one. .. Further, since the clip body 312 has the key-shaped through hole 312a, there is an advantage that the erasing member 350 is hard to come off easily. Further, since the erasing member 350 has the top portion 351a, the curved surface portion 351b, and the ridge portion 351c, there is also an advantage that the user can freely select the portion to be rubbed according to the area and shape to be erased. ..

1 Writing Tool 10 Clip 20 Clip Fixing Body 30 Leaf Spring 40 Writing Tool Main Body 50 Erasing Member R Rotation Axis

Claims (2)

Writing instrument body, a plurality of writing refills containing thermochromic ink and accommodated in the writing instrument body, a clip fixing body arranged at a rear end of the writing instrument body, and a storage section behind the clip fixing body. A first erasing member disposed on the above, and a crown portion fitted to the rear end of the clip fixing body,
The crown portion covers a rear end surface of the first erasing member, and a through hole smaller than the first erasing member is formed in the crown portion;
A space is formed between the crown portion and the first erasing member,
The first erasing member is made of a rubber elastic material capable of thermally discoloring the handwriting of the thermochromic ink by frictional heat generated when rubbing.
Further comprising a clip, and a second erasing member provided on the outer surface of the clip and having a shape different from the first erasing member,
The clip has a clip base portion, a clip body, and a coil spring for urging the clip body so that an article can be held between the clip base portion and the clip body,
The rotary feeding type writing instrument, wherein the clip base is rotatably connected to the clip fixed body. A plurality of the through holes are formed in the crown portion,
The second erasing member is attachable to and detachable from the clip, and the clip has a key-like through hole, and the second erasing member can be inserted into the key-like through hole. The rotary feeding type writing instrument according to claim 1, wherein the writing instrument has a flange portion and a connecting shaft.

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