JP2019188817A - Writing instrument comprising erasing member - Google Patents

Abstract

To facilitate removal of a top crown for protecting an erasing member of a writing instrument comprising an erasing member, from a rear end part of a barrel of the writing instrument.SOLUTION: A writing instrument 1 comprising an erasing member comprises: an erasing member 7 capable of erasing a handwriting which is written on a paper surface, on an end part of a barrel; and a top crown 10 for covering and protecting the erasing member 7 on the end part of the barrel. On an inner peripheral face of the top crown 10, a protrusion 11 or a projection is provided. On a fitting part of the top crown 10 on the end part of the barrel, a protrusion or projection 11 is provided, and on an outer peripheral face of the top crown 10, plural rib-state projecting parts 14 parallel to a cross direction of the writing instrument, are provided. The top crown 10 is fitted to the barrel by getting over the projection or protrusion on the barrel side by the protrusion 11 or projection of the top crown. As the result, when removing the top crown 10 from the barrel, the top crown 10 can be gripped using the plural rib-state projecting parts 14 on the outer peripheral face of the top crown 10, so that, during use of the erasing member 7, the top crown 10 can be easily removed from the barrel.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a writing instrument with an erasing member including a protective member that protects an erasing member capable of erasing handwriting written on paper with a writing instrument.

  In recent years, writing tools such as ballpoint pens and color markers using thermochromic ink have become widespread. A friction body made of an elastic material is provided behind the shaft of the writing instrument using such a thermochromic ink (the pen tip side of the writing instrument is the front and the opposite side is the rear). The handwriting is erased by thermally discoloring the thermochromic ink by heat generated by rubbing the handwriting with a friction body. The handwriting here means both letters and pictures written on paper (see Daijirin third edition).

  In the writing instrument using such a thermochromic ink, since the friction body is provided in a state of being exposed behind the shaft tube, dust and dirt may adhere to the friction body when not in use. For this reason, when the handwriting is rubbed with a friction body to which dust or dirt adheres after writing, the dust or dirt may move to the paper and stain the paper.

  Therefore, Patent Document 1 discloses a thermochromic writing instrument in which a friction body is covered with a cover when not in use. In Patent Document 1, a male screw is formed around the rear end opening of the shaft cylinder of the writing instrument attached with the friction body exposed, and a female screw is formed on the inner peripheral surface of the opening of the cover that covers the friction body. Then, the cover is screwed into the rear end portion of the shaft cylinder to hide the friction body when not in use.

  And in patent document 1, in order that the cover screwed in the rear-end part of the shaft cylinder of a writing instrument may not remove from the rear-end part of a shaft cylinder, a cover is screwed in the rear-end part of a shaft cylinder. When the cover is placed on the friction body, the elastic force of the friction body acts on the screwed portion so that the bottom of the cover is pressed against the friction body. Further, in Patent Document 1, when a sponge is attached to the bottom of the cover or a brush is attached, and the cover is screwed into the shaft cylinder of the writing body, the elasticity of the sponge or brush is applied to the screwed portion. Also disclosed is a structure on which act.

  However, in the thermochromic writing instrument described in Patent Document 1, it is necessary to relatively rotate the cover and the rear end portion of the shaft cylinder many times before the cover is completely screwed to the rear end portion of the shaft cylinder. There is a problem that it takes time to attach the cover to the rear end of the shaft cylinder. In addition, since the relative rotational speed until the cover is completely attached to the rear end of the shaft cylinder is large, if the rotation is stopped halfway because it is considered that the installation has been completed, the cover and the rear end of the shaft cylinder There was also a problem that the screwing strength was small, and the cover was removed and the cover was lost.

  Therefore, the cover (hereinafter referred to as the crown) is provided with a protrusion in the inner peripheral direction, and a protrusion that engages with the protrusion on the crown is provided on the outer peripheral surface of the rear end portion of the shaft cylinder provided with the friction body. When the crown is attached to the shaft tube, the projection on the crown is over the ridge provided on the outer peripheral surface of the rear end of the shaft tube and is locked to the ridge so that the crown is attached to the shaft tube. Patent Document 2 discloses a structure for attaching to the rear end.

JP 2014-124810 A JP 2014-141077 A

  However, in the thermochromic writing instrument described in Patent Document 2, the protrusion provided on the inner peripheral surface on the top crown side is moved over the protrusion on the rear end side of the shaft cylinder so that the crown is positioned at the rear end of the shaft cylinder. Although there is no problem when the crown is attached, there is a problem that it is difficult to remove the crown from the rear end of the shaft tube when the crown is removed from the rear end of the shaft tube. This is easy to push in by pushing the end surface of the rear end of the crown when fitting the crown to the rear end of the barrel, but when removing the crown from the rear end of the barrel, This is because the crown can be easily grasped because it is removed by holding the crown.

  According to the present invention, a crown that is a protective member (cover) that protects an erasing member of a writing instrument with an erasing member can be easily attached to the rear end portion of the writing cylinder, and the rear end of the writing instrument can be easily It is an object to provide a writing instrument with an erasing member that can be removed from the section.

  According to one aspect of the present invention, an erasing member capable of erasing handwriting written on a paper surface is provided at the rear end portion of the shaft cylinder, and a crown that covers and protects the erasing member is attached to the rear end portion of the shaft cylinder. In the writing instrument with an erasing member, there is provided a writing instrument with an erasing member, characterized in that a protrusion for assisting the grasping of the crown is provided on the outer peripheral surface of the crown.

  The protrusion can be a rib-like protrusion formed in a plurality of strips in the axial direction of the outer peripheral surface. Moreover, a protrusion part can be made into the clip formed in the outer peripheral surface of a crown. Furthermore, there is a refill for writing containing thermochromic ink inside the shaft tube, and the handwriting written by the refill can be thermally discolored by frictional heat generated when it is rubbed by the erasing member.

And the following aspects can be considered as a mechanism which attaches a crown to the rear-end part of a shaft cylinder.
(A) The first protrusion is provided on the inner peripheral surface of the crown, the second protrusion is provided on the outer peripheral surface of the rear end portion of the shaft cylinder, and the first protrusion overcomes the second protrusion. A mode in which the crown is attached to the rear end of the shaft tube.
(B) A protrusion is provided on the inner peripheral surface of the crown, a plurality of protrusions are provided on the outer peripheral surface of the rear end portion of the shaft cylinder, and the protrusion extends over the protrusion and the crown is attached to the rear end portion of the shaft cylinder. Aspect.
(C) A plurality of protrusions are provided on the inner peripheral surface of the crown, a protrusion is provided on the outer peripheral surface of the rear end portion of the shaft cylinder, and the protrusion climbs over the protrusion and the crown is attached to the rear end portion of the shaft cylinder. Aspect.
(D) A protrusion is provided on the inner peripheral surface of the crown, a circumferential groove is provided on the outer peripheral surface of the rear end portion of the shaft cylinder, the protrusion is fitted into the circumferential groove, and the crown is the rear end of the shaft cylinder. The aspect attached to a part.
(E) A circumferential groove is provided on the inner peripheral surface of the crown, a protrusion is provided on the outer peripheral surface of the rear end portion of the shaft cylinder, and the protrusion is fitted into the circumferential groove so that the crown is the rear end of the shaft cylinder. The aspect attached to a part.

Further, when the erasing member-attached writing instrument is a knocking-type writing instrument, the knocking-type writing instrument can have the following modes.
(1) A knock type that includes a shaft tube, a crown, and a knock bar to which the crown is attached, and can be switched between a writing state and a non-writing state by performing a knocking operation that presses the crown forward. A writing instrument.
(2) A knock clock member disposed in front of the knock bar and movable in the longitudinal direction in the shaft cylinder by gravity; and a locking portion provided on the inner surface of the shaft cylinder and locked with the knock clock member. An aspect of the knock type writing instrument that is provided and that when the front end of the shaft tube is directed upward, the knocking member is moved backward to be locked with the locking portion, and the forward movement of the operation portion is prevented.

  According to the writing instrument with an erasing member of the present invention, the crown that is protected at the erasing member and attached to the rear end portion of the shaft tube of the writing tool can be easily removed from the rear end portion of the shaft tube of the writing tool.

(A) is a front view of the writing instrument with an erasing member of the first embodiment of the present invention in a non-writing state, (b) is a longitudinal sectional view of the writing instrument with an erasing member shown in (a), and (c) is (b). It is the elements on larger scale which expanded the back side of the writing instrument with an erasing member shown in FIG. (A) is a front view showing a state in which the crown is removed from the writing instrument with an erasing member shown in FIG. 1 (a), and (b) is a drawing of the crown from the writing instrument with an erasing member shown in FIG. 1 (b). FIG. 4C is a partially enlarged cross-sectional view showing a state in which the crown is removed from the state shown in FIG. BRIEF DESCRIPTION OF THE DRAWINGS The structure of the crown of the 1st Example used for the writing instrument with the erasing member of 1st form of this invention is shown, (a) is the perspective view which looked at the crown from the knock stick insertion side, (b) is A perspective view of the crown from the rear side, (c) is a front view of the crown, (d) is a left side view of the crown, (e) is a right side view of the crown, and (f) is a crown view of the crown. It is sectional drawing of an axial direction. BRIEF DESCRIPTION OF THE DRAWINGS It shows the structure of the knock stick of 1st Example used for the writing instrument with the erasing member of 1st form of this invention, (a) is the perspective view which looked at the knock stick from the front end side of the writing instrument, (b). (C) is a front view of the knock bar, (d) is a left side view of the knock bar, (e) is a right side view of the knock bar, and (f) is a view of the knock bar. It is sectional drawing of an axial direction. (A) is a perspective view showing the operation of attaching the crown shown in FIG. 3 to the knock bar from the rear end side of the writing instrument including the knock bar shown in FIG. 4, and (b) from the state shown in (a). It is a perspective view which shows the state in which the crown was attached to the knock stick. The combination which can be used of the rear end part of the knock stick of the 1st-3rd Example used for the writing instrument with the erasing member of the 1st form of this invention, and the crown of the 1st-3rd Example attached to this It is explanatory drawing which shows. It shows the structure of the crown of the fourth embodiment used in the writing instrument with an erasing member of the first embodiment of the present invention, (a) is a perspective view of the crown from the knock bar insertion side, (b) is (C) is a front view of the crown, (d) is a left side view of the crown, (e) is a right side view of the crown, and (f) is (d). It is sectional drawing in the AA of the crown shown in FIG. (A) is a front view in a writing state of the writing instrument with an erasing member of the second embodiment of the present invention, (b) is a longitudinal sectional view of the writing instrument with an erasing member shown in (a), and (c) is in (b). It is the partial expanded sectional view which expanded the back side of the writing instrument with an erasing member shown. (A) is a front view showing a state in which the crown is removed when the writing instrument with an erasing member shown in FIG. 8 (a) is in a non-writing state, and (b) is a writing instrument with an erasing member shown in FIG. 8 (b). FIG. 9 is a longitudinal sectional view showing a state where the crown is removed when is in a non-writing state, and FIG. 9C is a partially enlarged sectional view showing a state where the crown is removed from the state shown in FIG. The structure of the crown of the 5th Example used for the writing instrument with the erasing member of the 2nd form of this invention is shown, (a) is a top view of a crown, (b) is a base side of a clip. (C) is a front view of the crown, (d) is a left side view of the crown, (e) is a right side view of the crown, and (f) is a perspective view of the crown from the tip side of the clip. The perspective view seen, (g) is a sectional view in the axial direction of the crown. (A) shows the structure of the erasing member side knock bar of the knock bar of the fourth embodiment used in the writing instrument with the erasing member of the second mode of the present invention, and (a) shows the erasing member side knock bar. The perspective view seen from the front end side of a writing instrument, (b) is the perspective view which looked at the erasing member side knock bar from the back side, (c) is the front view of the erasing member side knock bar, (d) is the erasing member side knock bar (E) is a right side view of the erasing member side knock bar, (f) is a front view of the erasing member side knock bar of the fifth embodiment, and (g) is an axial direction of the erasing member side knock bar. It is sectional drawing. (A) is a front view showing how the erasing member side knock bar shown in FIG. 11 is coupled to the cam side knock bar of the knock bar of the fourth embodiment, (b) is a sectional view of (a), (c) ) Is a front view showing a state where the erasing member side knock bar is coupled to the cam side knock bar. (A) is a perspective view showing the operation of attaching the crown shown in FIG. 10 to the knock bar from the rear end side of the writing instrument with an erasing member provided with the knock bar shown in FIG. 12 (c). It is a perspective view which shows the state from which the crown was attached to the knock stick from the state shown to a). (A) is a cross-sectional view of the crown of the sixth embodiment used for the writing instrument with the erasing member of the second form, (b) is a cross-section of the crown of the seventh embodiment used for the writing instrument with the erasing member of the second form. FIG. It is a front view of the crown of the 8th example used for a writing instrument with an erasing member of the 2nd form.

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

  FIG. 1 (a) shows a non-writing state in which the crown 10 of the first embodiment is attached to the writing instrument 1 with an erasing member according to the first embodiment of the present invention, as seen from the front. ) Shows a longitudinal section of the erasing member-equipped writing instrument 1 shown in FIG. As shown to Fig.1 (a), the writing instrument 1 with an erasing member of 1st form is a knock type writing instrument, the clip 9 is provided in the main-body part, and the crown 10 is provided in the opposite side to the writing side. Yes. In the following description, the writing side will be referred to as the front or front side, and the opposite side of the writing side will be referred to as the rear or rear side. Further, the erasing member-equipped writing instrument 1 is hereinafter also referred to as a knock-type writing instrument 1. The knock type writing instrument 1 includes an inner cylinder 8 having a shaft cylinder including a front shaft 2, a rear shaft 3, and a clip 9.

  Moreover, as shown in FIG.1 (b), inside the front axis | shaft 2, the rear axis | shaft 3, and the inner cylinder 8 of the knock type writing instrument 1, the refill 5 which is a writing body provided with the writing part 5a at one end, and the refill There are a spring 6 for urging the rear 5 and a knock mechanism 50 disposed at the rear end (rear end) of the rear shaft 3. The refill 5 contains, for example, a thermochromic ink that changes color due to frictional heat when rubbed with an erasing member, which will be described later, or ink that can be peeled off from the paper surface by an erasing member, which will be described later. To do.

  The knock mechanism 50 includes a knock bar 30 connected to the crown 10 and a rotor 60 provided between the knock bar 30 and the refill 5. The front side of the front shaft 2 is formed in a tapered shape, and a through hole 2a for projecting the writing portion 5a of the refill 5 is formed at the front end portion (front end portion). When a knocking operation for pressing the crown 10 is performed, the writing state in which the writing portion 5a of the refill 5 protrudes from the through hole 2a and the writing portion 5a are accommodated inside the through hole 2a by the knock rod 30 and the rotor 60. Become non-written.

  Further, an erasing member 7 is attached to the rear end (rear end) of the knock bar 30. The erasing member 7 can be attached to the knock bar 30 by fitting (press-fit), adhesion, two-color molding, or the like. The crown 10 is attached to the rear end portion of the knock bar 30 so as to cover the erasing member 7. The rear side of the front shaft 2 is inserted and screwed into the front end portion of the rear shaft 3. The inner cylinder 8 may be formed integrally with the rear shaft 3, and the front shaft 2 and the rear shaft 3 may also be formed integrally. In addition, a knock clock member 4 is disposed in front of the knock mechanism 50, that is, in front of the knock bar 30 in the shaft cylinder.

  The knock clock member 4 is movable in the front-rear direction in the rear shaft 3 by gravity, and when the writing portion 5a faces downward and the knock clock member 4 moves in the rear shaft 3 toward the front shaft 2, the knock mechanism The knock operation by the canopy 10 is made possible without acting on 50. On the other hand, when the erasing member 7 faces downward and the knocking member 4 moves to the rotor 60 side in the rear shaft 3, it acts on the knocking mechanism 50 so that the knocking operation with the crown 10 cannot be performed. This is because when the crown 10 is removed and the erasing member 7 is used to erase the handwriting on the paper, the erasing member 7 should be fixed to the main body.

  Note that the switching of the writing state and the non-writing state of the knock type writing instrument 1 by the knock mechanism 50 when the crown 10 is pressed and the operation / non-operation of the rotor by the movement of the knocking member 4 are directly described in the present invention. No further explanation is given here.

  FIG.1 (c) shows the rear side of the knock type writing instrument 1 shown in FIG.1 (b) partially expanded. An erasing member mounting hole 37 is provided at the rear end portion of the knock bar 30, and the erasing member 7 is provided in the erasing member mounting hole 37 by fitting, press-fitting, or bonding. Further, the erasing member 7 can be provided on the knock bar 30 by two-color molding or the like. And the crown 10 which covers the erasing member 7 is attached to the rear-end part of the knock stick 30 so that attachment or detachment is possible.

  2A shows a state in which the crown 10 has been removed from the knock type writing instrument 1 shown in FIG. 1A, and FIG. 2B shows the knock type writing instrument shown in FIG. 2A. 1 shows a longitudinal section. 2C shows a state in which the crown 10 is removed from the rear end portion of the knock bar 30 from the state shown in FIG. When the crown 10 is removed, the erasing member 7 is exposed. Here, the structure of the first embodiment of the crown 10 used in the knock type writing instrument 1 of the first form and the structure of the knock bar 30 will be described with reference to FIGS.

  FIG. 3A shows the crown 10 of the first embodiment as viewed from the insertion side (front) of the knock bar, and FIG. 3B shows the crown 10 shown in FIG. Is seen from. 3C is a view of the crown 10 shown in FIG. 3A viewed from the front, and FIG. 3D is the left side of the crown 10 shown in FIG. FIG. 3E is a right side view of the crown 10. Further, FIG. 3F shows a cross section of the crown 10 in the axial direction.

  The crown 10 of the first embodiment is provided with a bottom surface 15 at one end of a cylindrical tube. Protrusions 11 are provided at predetermined equal intervals on the inner peripheral surface near the opening 16. It is. In the first embodiment, the number of protrusions 11 is four, but the number of protrusions 11 is not particularly limited. However, when attaching the crown 10 to the knock bar, it is desirable to provide the projections 11 at equal intervals so that they can be attached with a uniform pushing force. As can be seen from FIG. 3D, the height of the protrusion 11 from the inner peripheral surface of the crown 10 is very small. The outer shape of the protrusion 11 is oval or elliptical. Although the top surface of the projection 11 of this embodiment is planar, it may be raised in a dome shape.

  On the other hand, a plurality of rib-like protrusions 14 parallel to the axis of the crown 10 are provided on the outer peripheral surface of the crown 10. The projecting portions 14 are provided on the outer peripheral surface of the crown 10 so as to project radially from the axis of the crown 10 at equal intervals. The projecting portions 14 are tapered portions 14a on the side where the bottom surface 15 of the crown 10 is present. Thus, the height from the outer peripheral surface of the crown 10 is gradually reduced. And the outer peripheral surface of the canopy 10 between the projecting portion 14 and the projecting portion 14 is a groove 13 that connects the canopy 10 in the front-rear direction, and this becomes an airway at the time of accidental ingestion of the canopy 10, No vent hole is provided in the bottom surface 15 of the crown of the first embodiment.

  4A shows the knock bar 30 of the first embodiment provided with the erasing member 7 in the knock mechanism 50 of the knock type writing instrument 1 shown in FIGS. 1B and 2B. . 4B is a view of the knock bar 30 shown in FIG. 4A viewed from the opposite side, and FIG. 4C is a front view of the knock bar 30 shown in FIG. Is seen from. 4D shows the knock bar 30 shown in FIG. 4C viewed from the left side, and FIG. 4E viewed from the right side. Furthermore, FIG.4 (f) has shown the cross section of the axial direction of the knock stick 30 shown in FIG.4 (c).

  The knock bar 30 of the first embodiment has a large-diameter portion 33 that is connected to the rotor of the knock mechanism, and a small-diameter portion 34 that is an attachment portion of the crown 10 adjacent to the large-diameter portion 33. On the rotor side (front side) of the large-diameter portion 33, there is a protrusion on the outer peripheral surface, a cam is formed at the front end portion, and there is a communication hole 39 that communicates with an erasing member mounting hole 37 described later. Since protrusions and cams are not directly related to the present invention, their description is omitted here.

  The small diameter portion 34 has a slightly smaller diameter than the large diameter portion 33. As shown in FIG. 4 (f), an erasing member mounting hole 37 for holding the erasing member 7 is provided inside a part of the large diameter portion 33 and the small diameter portion 34, and this erasing member mounting hole. An erasing member 7 is attached to 37. As described above, the erasing member 7 is fitted, press-fit, or bonded to the erasing member mounting hole 37 as a separate part, or is provided by two-color molding together with the large diameter portion 33 and the small diameter portion 34. The diameter of the erasing member 7 is smaller than the inner diameter of the crown 10 described with reference to FIG.

  Further, an annular protrusion 32 is provided on the outer peripheral surface of the small diameter portion 34. The height of the ridge 32 from the outer peripheral surface of the small diameter portion 34 is very small, and the distance between the ridge 32 and the large diameter portion 33 is the opening 16 of the crown 10 shown in FIG. Is equal to the distance from the end of the protrusion 11 on the bottom surface 15 side. For this reason, when the crown 10 is attached to the knock bar 30, the protrusion 11 gets over the protrusion 32, and the protrusion 11 is locked by the protrusion 32 as shown in FIG.

  FIG. 5 (a) shows an operation of attaching the crown 10 shown in FIG. 3 to the knock bar 30 from the rear end side of the knock type writing instrument 1 including the knock bar 30 shown in FIG. The knocking rod 30 is attached to the knocking writing instrument 1 in a state where the distal end portion of the small diameter portion 34 and the erasing member 7 protrude from the opening 8a at the rear end portion of the inner cylinder 8 of the knocking writing instrument 1. When the crown 10 is attached to the rear end side of the knock type writing instrument 1, the crown 10 is put on the erasing member 7 and inserted into the inner cylinder 8 from the opening 8a. Then, the protrusion 11 provided on the inner peripheral surface of the crown 10 is attached to the knock bar 30 over the protrusion 32 of the small diameter portion 34.

  FIG. 5 (b) shows a state in which the crown 10 is inserted into the inner cylinder 8 of the knock type writing instrument 1 and attached to the knock bar 30 from the state shown in FIG. 5 (a). In this state, as shown in FIG. 1 (c), the protrusion 11 provided on the canopy 10 gets over the protrusion 32, and on the outer peripheral surface of the small diameter portion 34 between the protrusion 32 and the large diameter portion 33. The protrusion 11 and the protrusion 32 are engaged. As a result, the crown 10 attached to the knock bar 30 from the rear end portion of the knock type writing instrument 1 is difficult to come off. Since the crown 13 has the grooves 13 and the protrusions 14, the crown 10 can be easily grasped and the crown 10 can be easily detached from the knock bar 30. The number of the protrusions 14 and the depth and shape of the groove 13 are not particularly limited as long as the crown 10 inserted into the knock bar 30 can be easily removed. Therefore, for example, when the crown 10 is made of metal, the outer surface of the crown 10 may be knurled or satin-finished.

  The crown 10 of the first embodiment is provided with protrusions 11 on the inner peripheral surface thereof, and the knock bar 30 of the first embodiment is provided with an annular protrusion 32 on the outer peripheral surface of the small diameter portion 34. It was. The crown 10 of the first embodiment is shown in cross section in the uppermost right view of FIG. 6, and the knock bar 30 of the first embodiment is shown in the uppermost left view of FIG. Only shown.

  On the other hand, with respect to the crown, the crown 10A of the second embodiment shown in cross section in the right diagram in the center of FIG. 6 and the crown 10B of the third embodiment shown in cross section in the bottom right diagram of FIG. Is possible. The crown 10A of the second embodiment is provided with an annular protrusion 12 on the inner peripheral surface instead of a protrusion. The crown 10B of the third embodiment has an annular groove 18 provided on the inner peripheral surface. The position of the annular groove 18 is closer to the bottom surface 15 side than the position of the projection 11 in the crown 10 of the first embodiment, and is a position for receiving the protrusion 32 when coupled with the knock bar 30 of the first embodiment.

  As for the knock bar, the knock bar 30A of the second embodiment whose rear end is shown in the left side of the center of FIG. 6 and the third embodiment of which the rear end is shown in the lower left side of FIG. No knock bar 30B is possible. The knock bar 30A of the second embodiment includes protrusions 31 provided on the outer peripheral surface of the small diameter portion 34 at predetermined intervals instead of the protrusions. The knock bar 30B of the third embodiment is provided with an annular groove 38 on the outer peripheral surface of the small diameter portion 34 for receiving the projection 11 of the crown 10 of the first embodiment or the protrusion 12 of the crown 10A of the second embodiment. is there. For this reason, the position of the annular groove 38 is closer to the large diameter portion 33 than the position from the large diameter portion 33 of the protrusion 32 in the knock bar 30 of the first embodiment.

  FIG. 6 shows the crown 10 of the first embodiment, the crown 10A of the second embodiment and the crown 10B of the third embodiment, the knock rod 30 of the first embodiment, and the knock rod 30A of the second embodiment. The possible combinations of the knock bars 30B of the third embodiment are indicated by arrows. The crown 10 of the first embodiment can be combined with the knock bars 30 and 30B of the first and third embodiments. The crown 10A of the second embodiment can be combined with all of the knock bars 30, 30A, 30B of the first to third embodiments. Furthermore, the crown 10B of the third embodiment can be combined with the knock bars 30, 30A of the first and second embodiments.

  FIGS. 7A to 7F show the structure of the crown 10C of the fourth embodiment used in the knock type writing instrument 1 according to the first embodiment of the present invention, and FIGS. 3A to 3F. The drawing in the same state as the crown 10 of the first embodiment shown in FIG. The crown 10C of the fourth embodiment is different from the crown 10 of the first embodiment only in that a vent hole 17 for securing a ventilation amount is provided by the bottom surface 15. In the crown 10C of the fourth embodiment, the vent hole 17 is an arc-shaped long hole and two holes are provided. However, the shape and number of the vent holes 17 are not particularly limited, and the ventilation amount may be increased.

  FIG. 8A is a front view of the writing instrument 1A of the second embodiment of the present invention in which the crown 20 of the fifth embodiment is attached and is in a writing state, and FIG. The longitudinal cross-section of the knock type writing instrument 1A shown to Fig.8 (a) is shown. FIG. 9 (a) is a front view of the knocking writing instrument 1A shown in FIG. 8 (a) in a non-writing state with the crown 20 removed, and FIG. 9 (b) is a view of FIG. The longitudinal cross section of the knock type writing instrument 1A shown to (a) is shown. Further, FIG. 8C shows the rear end portion of FIG. 8B partially enlarged, and FIG. 9C shows the rear end portion of the knock type writing instrument 1A shown in FIG. 9B. A partially enlarged view is shown.

  The structure of the main body of the knock type writing instrument 1A of the second form is the same as that of the knock type writing instrument 1 of the first form, and the main body includes a front shaft 2, a rear shaft 3, and an inner cylinder 8. The knocking writing instrument 1 is also the same as the knocking writing instrument 1 in that the front shaft 2, the rear shaft 3, and the inner cylinder 8 of the knocking writing instrument 1 </ b> A have a refill 5, a spring 6, and a knock mechanism 50. The knock mechanism 50 includes a knock bar 40 and a rotor 60 provided between the knock bar 40 and the refill 5. The rotor 60 is the same as the knock type writing instrument 1, but the structure of the knock bar 40 is knocked. It differs from the structure of the knock bar 30 of the formula writing instrument 1. The structure of the knock bar 40 will be described later.

  The front side of the front shaft 2 is formed in a tapered shape, and a through hole 2a for projecting the writing part 5a of the refill 5 is formed at the front end part (front end part) as in the knock type writing instrument 1. is there. Even in the knock type writing instrument 1A of the second form, when a knocking operation for pressing the crown 20 is performed, a writing state in which the writing portion 5a of the refill 5 protrudes from the through hole 2a by the knock rod 40 and the rotor 60 (FIG. 8 ( a) and (b)), and the writing part 5a is in a non-writing state (FIGS. 9A and 9B) accommodated inside the through hole 2a. The function of the knock clock member 4 disposed in front of the knock bar 40 is the same as that of the knock clock member 4 in the knock type writing instrument 1 of the first embodiment, and is not directly related to the present invention. The description of is omitted.

  The second form of the knock type writing instrument 1A is different from the first form of the knock type writing instrument 1 in that the clip 9 is provided on the outer peripheral surface 21 of the crown 20 and the knock bar 40 is connected to the cam side knock bar 41. The point is that the erasing member side knock bar 42 is divided. The knock bar 40 is usually integrated, but the erasing member side knock bar 42 can be separated from the cam side knock bar 41. As shown in FIGS. 8C and 9C, the cam side knock bar 41 is coupled to the rotor 60, and the erasing member 7 is inserted into the erasing member mounting hole 47 provided in the erasing member side knock bar 42. Is attached.

  The crown 20 of the fifth embodiment is attached to the erasing member side knock bar 42. The erasing member 7 is attached to the erasing member side knock bar 42 by adhesion, but the erasing member 7 can be provided on the erasing member side knock bar 42 by two-color molding or the like. The connecting portion between the cam side knock bar 41 and the erasing member side knock bar 42 is exposed to the outside from the opening 8a of the inner cylinder 8 even when the knock type writing instrument 1A is in a writing state. Here, the crown 20 and the knock bar 40 will be described with reference to FIGS. 10 to 13.

  10 (a) to 10 (f) are views of the crown 20 of the fifth embodiment used in the knock type writing instrument 1A of the second form of the present invention as seen from various directions. ) Shows a cross section of the crown 20 in the axial direction. The crown 20 covers the erasing member attached to the end of the knock bar to protect it from debris and hand dust, and can be removed from the knock bar when the erasing member is used. The clip 9 is attached to the outer peripheral surface of the crown 20, but there are no protrusions on the inner peripheral surface 22 of the crown 20, and the inner diameter of the inner peripheral surface 22 is slightly from the bottom surface 26 toward the opening 27. It is getting bigger.

  11 (a) to 11 (e) are views of the erasing member side knock bar 42 of the knock bar 40 of the fourth embodiment used in the knock type writing instrument 1A of the second mode of the present invention as seen from various directions. FIG. 11G shows a cross section of the erasing member side knock bar 42 in the axial direction. The erasing member side knock bar 42 includes a coupling portion 43 coupled to the cam side knock rod 41, an erasing member retaining portion 44 that retains the erasing member 7, and a flange portion provided between the coupling portion 43 and the erasing member retaining portion 44. There are 45. Two annular coupling ridges 46 are provided on the outer peripheral surface of the coupling portion 43, and an annular engagement ridge 48 is also provided on the outer circumferential surface of the erasing member holding portion 44. The engaging protrusion 48 has a height that is slightly raised from the outer peripheral surface.

  In the fourth embodiment, the erasing member side knock bar 42 is provided with an annular engaging protrusion 48, but the engaging protrusion 48 is an engaging protrusion 48A arranged in an annular shape as shown in FIG. The erasing member side knock bar 42A of the fifth embodiment is also possible. The erasing member holding portion 44 has an erasing member mounting hole 47, and the erasing member 7 is mounted in the erasing member mounting hole 47. The erasing member 7 can be bonded to the erasing member mounting hole 47 as a separate member, or can be formed together with the erasing member holding portion 44 by two-color molding.

  FIG. 12A shows the erasing member side knock bar 42 of the fourth embodiment explained in FIG. 11 together with the cam side knock bar 41, and FIG. 12B shows the cam shown in FIG. The cross section of the side knock bar 41 and the erasing member side knock bar 42 is shown. The cam side knock bar 41 is provided with a communication hole 39 for receiving the coupling part 43 of the erasing member side knock bar 42, and the outer peripheral surface of the coupling part 43 of the erasure member side knock bar 42 is formed on the inner peripheral surface of the communication hole 39. Two coupling ridges 49 for locking the two coupling ridges 46 provided on the surface are provided. When the erasing member side knock bar 42 is coupled to the cam side knock bar 41, a knock bar 40 as shown in FIG. 12C is formed.

  FIG. 13 (a) shows the operation of attaching the crown 20 shown in FIG. 10 to the knock bar 40 from the rear end side of the knock type writing instrument 1A including the knock bar 40 shown in FIG. 12 (c). is there. The knock bar 40 is a knock type in a state in which the erasing member side knock bar 42 provided with the cam side knock bar 41 and the erasing member 7 protrudes from the opening 8a at the rear end portion of the inner cylinder 8 of the knock type writing instrument 1A. It is attached to the writing instrument 1A. When the crown 20 is attached to the rear end side of the knock type writing instrument 1A, the crown 20 is put on the erasing member 7 and attached to the erasing member side knock bar 42. Thereby, the taper-shaped inner peripheral surface of the crown 20 is frictionally coupled to the engaging protrusion 48 formed on the outer peripheral surface of the erasing member holding portion 44 of the erasing member side knock bar 42 to be erased member side knock bar 42. Attached to.

  FIG. 13B shows a state in which the crown 20 is attached to the knock bar 40 from the state shown in FIG. In this state, as shown in FIG. 8C, the inner peripheral surface of the crown 20 is frictionally coupled to the engaging protrusion 48 formed on the outer peripheral surface of the erasing member holding portion 44 of the erasing member side knock bar 42. The erasing member side knock bar 42 is engaged. Since the clip 9 is provided in the crown 20, the crown 20 can be easily attached to and detached from the erasing member side knock bar 42 using the clip 9. Further, the erasing member 7 can be used by removing the erasing member side knock bar 42 from the cam side knock bar 41.

  Fig.14 (a) shows the cross section of the crown 20A of the 6th Example used for the knock type writing instrument 1A of a 2nd form. In the crown 20 of the fifth embodiment, no protrusion is provided on the inner peripheral surface of the crown 20, but on the inner peripheral surface 22 of the crown 20 A of the sixth embodiment, in the vicinity of the opening 27. A protrusion 23 that slightly protrudes from the inner peripheral surface 22 is provided. When the crown 20A of the sixth embodiment is attached to the erasing member side knock bar 42, the ridge 23 is located between the engaging ridge 48 and the flange portion 45 of the erasing member holding portion 44 shown in FIG. Since it fits into the portion, the engagement strength between the crown 20A and the erasing member side knock bar 42 can be increased. However, since the engagement between the protrusion 23 and the engagement protrusion 48 of the erasing member holding portion 44 is not so strong, if the clip 9 provided on the crown 20A is used, the erasing member side knock bar 42 is used. It is possible to easily attach and detach the crown 20A.

  FIG. 14B shows a cross section of the crown 20B of the seventh embodiment used in the knock type writing instrument 1A of the second form. In the crown 20 of the fifth embodiment, no protrusion is provided on the inner peripheral surface of the crown 20, but on the inner peripheral surface 22 of the crown 20 B of the seventh embodiment, in the vicinity of the opening 27. A protrusion 24 that slightly protrudes from the inner peripheral surface 22 is provided. When the crown 20B of the seventh embodiment is attached to the erasing member side knock bar 42, the protrusion 24 is a portion between the engaging protrusion 48 and the flange portion 45 of the erasing member holding portion 44 shown in FIG. Therefore, the engagement strength between the crown 20B and the erasing member side knock bar 42 can be increased. However, since the engagement between the protrusion 24 and the engaging protrusion 48 of the erasing member holding portion 44 is not so strong, if the clip 9 provided on the crown 20B is utilized, The crown 20B can be easily attached and detached.

  FIG. 15 shows the crown 20C of the eighth embodiment used for the knock type writing instrument 1A of the second form. The crown 20C of the eighth embodiment has the crowns 10, 10A, 10B and 10C of the first to fourth embodiments on the portion of the outer peripheral surface 21 of the crown 20 of the fifth embodiment where the clip 9 is not provided. Similarly, a plurality of rib-like protrusions 25 parallel to the axis of the crown 20C are provided. The protrusions 25 may be provided in a radially spaced manner centered on the axis of the crown 20C at a portion where the clip 9 on the outer peripheral surface of the crown 20C is not provided. A tapered portion 25a is provided on the side of the protruding portion 25 where the bottom surface 26 of the crown 20C is present. Since the protrusion 25 is provided on the outer peripheral surface 21 of the crown 20C, the crown 20C can be easily gripped, and the crown 20C and the erasing member side knock bar 42 can be more easily attached and detached. The shape and number of the protrusions 25 are not particularly limited as long as the crown 20C can be easily grasped. Therefore, for example, when the crown 20C is made of metal, the outer surface of the crown 20C may be knurled.

  As described above, in the knock type writing instrument of the present invention, the erasing member 7 is covered with the crown 10, 10A, 10B, 10C, 20, 20A, 20B or 20C except when in use. It is possible to prevent the member 7 from being soiled. The crown 10, 10A, 10B, 10C, 20, 20A, 20B or 20C can be easily attached to the knock bar, and the crown attached to the knock bar can be easily removed from the knock bar. Can do.

  In the embodiment described above, thermochromic ink is accommodated in the refill which is a cursive. In this case, the knock-type writing instrument is a thermochromic writing instrument, and the erasing member is formed of a member that generates frictional heat with the paper surface when the paper surface is rubbed, and the handwriting of the knock-type writing tool is generated by the generated frictional heat. The heat can be discolored. As the writing body, a ballpoint pen containing a thermochromic ink, a mechanical pencil containing a thermochromic core, a pencil holder, or the like can be considered. In addition, a knocking writing instrument in which an eraser erasable ink that can be erased with an eraser is accommodated in the refill is possible. In this case, a member that is worn when the ink is peeled off from the paper surface is selected as the erasing member, similarly to the eraser.

  Here, the thermochromic ink means that a predetermined color (first color) is maintained at room temperature (for example, 25 ° C.), and when the temperature is raised to a predetermined temperature (for example, 65 ° C.), another color (second color) is obtained. The ink has a property of returning to the original color (first color) when cooled to a predetermined temperature (for example, −10 ° C.). In the writing instrument 1 using the thermochromic ink, making the second color colorless and raising the temperature of the stroke drawn with the first color (for example, red) to make it colorless is referred to as “erasing” here. Therefore, the friction surface as an erasing member rubs against the writing 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.

  Further, in a writing instrument that uses a refill containing an eraser erasable ink that can be erased with an eraser, the eraser erasable ink is composed of water and non-thermoplastic colored resin particles having an average particle diameter of 1.0 to 15 μm. On the other hand, it is necessary to contain at least 3 to 30% by weight and 0.1 to 15% by weight of non-colored particles.

  The colored resin particles used in the aqueous ink of the present invention are made of colored resin particles, are non-thermoplastic, and have an average particle diameter of 1.0 to 15 μm. For example, resin particles Colored resin particles in which a colorant made of pigment is dispersed, colored resin particles in which the surface of the resin particle is coated with a colorant made of pigment, colored resin particles in which a colorant made of dye is dyed on the resin particle, etc. Is mentioned.

  In this example, if the colored resin particles are non-thermoplastic and satisfy the above average particle diameter, the structure (with hollow structure, without hollow structure (solid)), shape (spherical, polygonal, flat) Is not particularly limited, but preferably has a glass transition point of 150 ° C. or higher and a thermal decomposition temperature from the viewpoint of exhibiting excellent eraser erasability, writing property, and stability over time as an ink. In addition, particles having an intramolecular cross-link having a melt flow index value of less than 0.1 are not sticky, and spherical colored resin fine particles having an average particle size of 1.0 to 15 μm Use is desirable.

  Rubber materials such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber, and other rubber elastic materials such as thermoplastic elastomers such as styrene elastomer, olefin elastomer, and polyester elastomer Examples thereof include a mixture of the above rubber elastic materials, a mixture of a rubber elastic material and a synthetic resin, and a commercially available eraser.

  When the erasing member is a thermochromic writing instrument, it is formed from a mixture of a polypropylene resin and a styrene thermoplastic elastomer or a mixture of a polypropylene resin and a polypropylene thermoplastic elastomer, and the blending ratio thereof is 1: 1 by weight. ~ 1: 4, does not contain abrasives, plasticizers and fillers, is made of a material having a durometer hardness A specified in JIS K6251 of 70 ° to 100 °, and a pencil specified in JIS S 6050-2002 It is formed from a low-abrasion elastic material that does not contain a plasticizer that has a drawn line erasing ability (erasure rate) of 70% or less. As a result, the erasing member is effective because it is less likely to be erased when scraped and has excellent thermal discoloration.

  Note that “erasing” in the present invention means that the drawn strokes, characters, etc. are adsorbed or scraped off by an erasing portion such as an eraser, in addition to the case where the thermochromic ink is used. Furthermore, a configuration may be employed in which an erasing member and a crown are provided at the rear end portion of the capacitive touch pen by imparting electrical conductivity to the pressure-sensitive touch pen or the shaft tube. Therefore, this invention is applicable also to the arbitrary stationery provided with the erasing member which can erase the drawn line (handwriting) written by the writing implement.

1, 1A Writing instrument with erasing member (knock type writing instrument)
7 Erasing member 8 Inner cylinder 9 Clip 10, 10A, 10B, 10C, 20, 20A, 20B, 20C Crown crown 11, 24, 31 Projection 12, 23, 32 Projection 13 Groove 14, 25 Projection 30, 30A, 30B 40 knock bar 41 cam side knock bar 42 erasing member side knock bar

Claims (2)

An erasing member capable of erasing handwriting written on paper is provided at the rear end portion of the shaft tube, and a crown that covers and protects the erasing member is attached to the rear end portion of the shaft tube, and the crown is knocked. The pen tip of the refill is made to appear and disappear from the tip of the shaft tube, and there is a refill for writing containing thermochromic ink inside the shaft tube, and the handwriting written by the refill is the erasing member In a writing instrument with a knocking type erasing member that can be thermally discolored by frictional heat generated when rubbing by
The erasing member is fitted in a knock bar located on the most rear end side of a knock mechanism that is provided in a shaft cylinder of the writing instrument and causes the pen tip of the refill to move in and out by knocking the crown. Connected by
The knock bar is provided with a split portion, and is formed so as to be split into the erasing member side knock bar and the pen tip side knock bar,
The crown can be attached to and detached from the erasing member side knock bar by forming a clip on its outer peripheral surface,
The split portion of the erasing member side knock bar and the nib side knock bar is exposed to the outside from the rear end of the shaft tube even when the knock type writing instrument is in a writing state, and the erasing member side knock bar is A writing instrument with an erasing member, which can be divided from a nib-side knock bar.   2. The writing instrument with an erasing member according to claim 1, wherein a plurality of rib-shaped protrusions formed in the axial direction are formed on a portion excluding the clip on the outer peripheral surface of the crown. .

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