JP2021066138A - Writing instrument - Google Patents

Abstract

To enable a writing body to be protruded and retracted smoothly in a writing instrument which utilizes gravity to enable the writing body to be protruded and retracted.SOLUTION: A writing instrument 10 includes: a barrel 20; a writing body 16 disposed in the barrel 20; a lock member 80 which is disposed behind the writing body 16 in such a way so as to be movable in an axial direction da of the barrel 20; and a slide member 70 disposed between the writing body 16 and the lock member 80. When the lock member 80 is located in a first lock position, movement of the slide member 70 in the axial direction da is restricted. When the lock member 80 is located in a non-lock position at the rear side relative to the first lock position, the movement of the slide member 70 in the axial direction da is allowed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a writing instrument.

Conventionally, a writing instrument such as a ballpoint pen having a haunting type cursive has been used.

In Patent Document 1, an ink tube is housed in a shaft tube having a shaft hole for entering and exiting a secretary at the tip and a screw plug having a blind hole at the rear end, and a weight slidable in the ink tube. A writing tool in which a tube is loosely fitted and a writing portion moves in and out of a shaft hole by sliding a weight tube is disclosed. A ring is fitted or screwed to the outer periphery of the rear end of the ink tube. In this writing instrument, when the pen tip side is turned down, the ink tube moves to the pen tip side due to the weight of the weight tube, and the writing portion protrudes from the shaft hole. At this time, even if the writing part is pushed toward the rear end side by removing the ring from the blind hole, the ring comes into contact with the portion around the blind hole in the screw plug, so that the writing part is immersed in the barrel. Is hindered.

Jikkai Sho 49-113727

In a writing instrument that uses gravity to make the cursive appear and disappear, the cursive moves smoothly forward when the cursive is projected, and moves backward when the cursive is immersed. Is desired to be performed smoothly.

The present invention has been made in consideration of such a point, and an object of the present invention is to realize a smooth infestation motion of a cursive in a writing instrument in which a cursive is infested by using gravity.

The writing tool according to the present invention
Axial tube and
The cursive placed in the barrel and
A lock member arranged behind the cursive so as to be movable in the axial direction of the barrel,
A slide member arranged between the cursive and the lock member is provided.
When the lock member is located at the first lock position, the axial movement of the slide member is restricted, and when the lock member is located at a non-lock position behind the first lock position, the above. Axial movement of the slide member is allowed.

In the writing tool according to the present invention
The shaft cylinder has an engaging groove on the inner peripheral surface and has an engaging groove on the inner peripheral surface.
The engaging groove is connected to a first portion extending in the axial direction and a front end portion of the first portion, extends axially toward the front, and is arranged so as to be displaced in the circumferential direction with respect to the first portion. With the second part,
The lock member has a first protrusion that can move inside the first portion.
The slide member may have a second protruding portion that is movable inside the first portion and the second portion.

In the writing tool according to the present invention
When the lock member is located at the first lock position, the second protrusion may be located inside the second portion.

In the writing tool according to the present invention
The rear end portion of the second protruding portion has a first pressing surface that is inclined with respect to the axial direction and the circumferential direction.
The rear end portion of the second portion may have a first pressure receiving surface that is inclined in the same direction as the first pressing surface with respect to the axial direction and the circumferential direction.

In the writing tool according to the present invention
The front end portion of the second protruding portion has a first guided surface that is inclined with respect to the axial direction and the circumferential direction.
The front end portion of the first portion may have a first guide surface that is inclined in the same direction as the first guided surface with respect to the axial direction and the circumferential direction.

In the writing tool according to the present invention
The lock member has a first ridge extending axially in the front portion.
The slide member has a first concave groove extending in the axial direction on the inner peripheral surface.
When the lock member is located at the first lock position, at least a part of the first ridge is located in the first concave groove.
The first ridge does not have to be located in the first recessed groove when the locking member is located in the unlocked position.

In the writing tool according to the present invention
The first lock position may be the front end in the axially movable range of the lock member.

In the writing tool according to the present invention
A holding member located behind the lock member and holding the friction member is further provided.
When the lock member is located at the second lock position, the axial movement of the holding member is restricted, and when the lock member is located at the non-lock position on the front side of the second lock position, the holding member is held. Axial movement of the member may be allowed.

In the writing tool according to the present invention
The engaging groove has a third portion that is connected to the rear end portion of the first portion, extends in the axial direction toward the rear, and is arranged so as to be displaced in the circumferential direction with respect to the first portion. ,
The holding member may have a third protruding portion that is movable inside the first portion and the third portion.

In the writing tool according to the present invention
When the lock member is located at the second lock position, the third protrusion may be located inside the third portion.

In the writing tool according to the present invention
The front end portion of the third protruding portion has a second pressing surface inclined with respect to the axial direction and the circumferential direction.
The front end portion of the third portion may have a second pressure receiving surface that is inclined in the same direction as the second pressing surface with respect to the axial direction and the circumferential direction.

In the writing tool according to the present invention
The rear end portion of the third protruding portion has a second guided surface that is inclined with respect to the axial direction and the circumferential direction.
The rear end portion of the first portion may have a second guide surface that is inclined in the same direction as the second guided surface with respect to the axial direction and the circumferential direction.

In the writing tool according to the present invention
The locking member has a second ridge extending axially in the rear portion.
The holding member has a second concave groove extending in the axial direction on the inner peripheral surface.
When the lock member is located at the second lock position, at least a part of the second ridge is located in the second recessed groove.
The second ridge does not have to be located in the second recessed groove when the locking member is located in the unlocked position.

In the writing tool according to the present invention
The second lock position may be the rear end in the axially movable range of the lock member.

According to the present invention, in a writing instrument in which a cursive is infested by using gravity, a smooth infestation motion of the cursive can be realized.

FIG. 1 is a view for explaining an embodiment according to the present invention, and is a vertical cross-sectional view showing a writing tool incorporating a locking mechanism in an immersive state. FIG. 2 is a vertical cross-sectional view showing the writing tool of FIG. 1 in a protruding state. FIG. 3A is a cross-sectional view corresponding to line IIIA-IIIA of FIG. FIG. 3B is a cross-sectional view corresponding to the line IIIB-IIIB of FIG. FIG. 4A is an exploded view of a part of the writing instrument. FIG. 4B is a diagram corresponding to FIG. 4A, in which each component is cut along a plane including the central axis of the writing instrument. FIG. 5A shows the positional relationship between the engaging groove of the axle cylinder and the first protruding portion of the locking member, the second protruding portion of the slide member, and the second protruding portion of the holding member when the locked member is in the unlocked position. It is a figure which shows. FIG. 5B shows the positional relationship between the first protrusion of the lock member, the first concave groove of the slide member, and the second concave groove of the holding member when the lock member is in the unlocked position, corresponding to FIG. 5A. It is a figure which shows. FIG. 6A is a diagram showing the positional relationship between the engaging groove and the first protruding portion, the second protruding portion, and the third protruding portion when the locked member is in the unlocked position. FIG. 6B is a diagram showing the positional relationship between the first ridge, the first concave groove, and the second concave groove when the lock member is in the unlocked position, corresponding to FIG. 6A. FIG. 7A is a diagram showing the positional relationship between the engaging groove and the first protruding portion, the second protruding portion, and the third protruding portion when the lock member is in the first lock position. FIG. 7B is a diagram showing the positional relationship between the first ridge, the first concave groove, and the second concave groove when the lock member is in the first lock position, corresponding to FIG. 7A. FIG. 8 is a vertical cross-sectional view showing the writing tool with the rear end portion facing down. FIG. 9A is a diagram showing the positional relationship between the engaging groove of the shaft cylinder, the first protruding portion of the lock member, and the second protruding portion of the holding member when the locked member is in the unlocked position. FIG. 9B is a diagram showing the positional relationship between the ridge of the lock member and the concave groove of the holding member when the lock member is in the unlocked position, corresponding to FIG. 5A. FIG. 10A is a diagram showing the positional relationship between the engaging groove and the first protruding portion and the second protruding portion when the locked member is in the unlocked position. FIG. 10B is a diagram showing a positional relationship between the ridge and the concave groove when the lock member is in the unlocked position, corresponding to FIG. 10A. FIG. 11A is a diagram showing the positional relationship between the engaging groove and the first protruding portion and the second protruding portion when the lock member is in the locked position. FIG. 11B is a diagram showing a positional relationship between the ridge and the concave groove when the lock member is in the locked position, corresponding to FIG. 11A.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

In addition, as used in the present specification, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle that specify the shape and geometric conditions and their degrees are strictly used. Without being bound by meaning, we will interpret it including the range in which similar functions can be expected.

In the present specification, the direction in which the central axis A of the writing tool extends (longitudinal direction, vertical direction in the longitudinal sectional view) is the axial direction da, the direction orthogonal to the axial direction da is the radial direction dr, and the direction around the central axis A is along the circumference. Let the circumferential direction be the circumferential direction dc. Further, along the axial direction da, the side close to the writing surface such as a paper surface is the front side when writing, and the side away from the writing surface is the rear side. That is, the pen tip side is the front side, and the side opposite to the pen tip is the rear side.

FIG. 1 is a view for explaining an embodiment according to the present invention, and is a vertical cross-sectional view showing a writing tool 10 incorporating a lock mechanism 60 in an immersive state, and FIG. 2 is a projection of the writing tool 10 of FIG. It is a vertical cross-sectional view which shows in a state.

In this embodiment, an example in which the writing tool 10 is a ballpoint pen will be described. The writing instrument 10 regulates the movement of the cursive 20, the cursive 16 for forming the handwriting, the friction member 15 for rubbing the handwriting, and the axial da of the cursive 16 in the protruding state of the cursive 16. It includes a lock mechanism 60. In the present embodiment, the lock mechanism 60 also has a function of restricting the movement of the friction member 15 in the axial direction when rubbing the handwriting.

The axle cylinder 20 includes a front shaft 30, a rear shaft 40 connected to the front shaft 30, a front middle cylinder 46 arranged inside the rear region of the rear shaft 40, and inside and front of the rear region of the rear shaft 40. It is possible to regulate the movement of the cursive 16 in the axial direction by contacting the rear middle cylinder 48 arranged behind the middle cylinder 46, the rear end cap 47 arranged behind the rear shaft 40, and the cursive 16. The piece member 22 and the like are included. The front shaft 30 has an opening 32 provided at the front end from which the writing portion 17 of the cursive 16 can project, a clip 34 provided on the outer surface of the front region, and a male screw portion provided on the outer surface of the rear region. It has 36 and a hole 38 capable of receiving the elastic piece 24 described later of the piece member 22. The rear shaft 40 has a female screw portion 42 provided on the inner surface of the front region. On the inner peripheral surfaces of the inner cylinders 46 and 48, the movement of the cursive body 16 in the axial direction da is restricted in the protruding state of the cursive body 16 in cooperation with the slide member 70 and the lock member 80 described later, and the writing body 16 is held. An engaging groove 50 is provided to regulate the movement of the friction member 15 in the axial direction when the cursive is rubbed in cooperation with the member 90 and the lock member 80. The details of the engaging groove 50 will be described later. By screwing the male screw portion 36 of the front shaft 30 and the female screw portion 42 of the rear shaft 40, the front shaft 30 and the rear shaft 40 are coupled to each other. The rear end cap 47 has an inwardly projecting portion 49 projecting inward in the radial direction dr at the rear end, and an opening through which the friction member 15 can project inside the radial direction dr of the inwardly projecting portion 49. The portion 44 is formed. The inwardly projecting portion 49 is a retaining member that prevents the middle cylinders 46 and 48 from being disengaged rearward from the engaging groove 50 and also prevents the lock member 80 and the holding member 90 from being disengaged rearward from the engaging groove 50. Has a function. The shape and dimensions of the inwardly protruding portion 49 (the shape and dimensions of the opening 44) are such that the second protruding portion 91, which will be described later, of the holding member 90 does not come off from the engaging groove 50 rearward.

The cursive 16 is housed in the barrel 20 so as to appear and disappear. The cursive 16 has an ink, an accommodating cylinder for accommodating the ink, and a writing portion 17 provided at the front end portion. As the ink, ink that can be used for a ballpoint pen can be used without particular limitation. As an example, a thermochromic ink can be used as the ink. The thermochromic ink may be a reversible thermochromic ink. The reversible heat-discoloring ink is a heat-decoloring type that changes from a color-developed state to a decolored state by heating and changes from a decolorized state to a color-developed state by cooling. Various reversible thermochromic inks, such as a heat-developing type that changes from a color-developed state to a decolored state, or a color memory-retaining type that exhibits a specific color in a specific temperature range and changes the color depending on the temperature, can be used alone or. It may be used in combination.

3A is a cross-sectional view corresponding to the line IIIA-IIIA of FIG. 1, and FIG. 3B is a cross-sectional view corresponding to the line IIIB-IIIB of FIG. The piece member 22 includes an elastic piece 24 having an abutting portion 26 that abuts on the cursive 16 arranged in the barrel 20. The piece member 22 can rotate with respect to the barrel 20 by a predetermined angle along the circumferential direction dc. In particular, when the piece member 22 is rotated to one side of the circumferential direction dc, as shown in FIG. 3A, the piece member 22 is in a restricted state of restricting the movement of the cursive body 16 in the axial direction da, and is rotated to the other side of the circumferential direction dc. Then, as shown in FIG. 3B, the cursive 16 is in an unregulated state that allows the movement of the cursive body 16 in the axial direction. In the example shown in FIGS. 3A and 3B, the piece member 22 has two elastic pieces 24 arranged at an angle of 180 degrees in the circumferential direction dc. Not limited to this, the piece member 22 may have one elastic piece 24 or three or more elastic pieces 24. When the piece member 22 has a plurality of elastic pieces 24, it is preferable that the piece members 22 are arranged at equal angles with each other in the circumferential direction dc. In the state before assembling to the writing instrument 10, the distance between the two abutting portions 26 facing each other is preferably smaller than the outer diameter of the accommodating cylinder of the cursive body 16. When the piece member 22 has three or more elastic pieces 24, the diameter of the circle inscribed in the plurality of abutting portions 26 is the outer diameter of the accommodating cylinder of the cursive 16 in the state before assembling to the writing tool 10. Is preferably smaller than. As a result, the contact portion 26 is pressed against the cursive body 16 in the regulated state shown in FIG. 3A, and is appropriate for restricting the movement of the cursive body 16 in the axial direction between the contact portion 26 and the cursive body 16. Friction force can be generated.

Since the writing instrument 10 has such a piece member 22, the movement of the cursive body 16 is restricted in an immersive state, so that the writing unit 17 unintentionally protrudes when the writing instrument 10 is carried. Can be prevented. Further, by restricting the movement of the cursive 16 in the protruding state, for example, when writing on a writing surface (wall surface or the like) extending in the vertical direction, the cursive does not immerse even if the writing portion 17 is turned upward. Can be done.

Next, the locking mechanism 60 of the writing tool 10 will be described with reference to FIGS. 4A and 4B. FIG. 4A is an exploded view of a part of the writing tool 10, and FIG. 4B is a view showing each part cut along a plane including the central axis A of the writing tool 10.

The lock mechanism 60 includes an engaging groove 50 provided in the middle cylinders 46 and 48, a slide member 70, a lock member 80, and a holding member 90.

The engaging groove 50 has a function of guiding the movement of the slide member 70, the lock member 80, and the holding member 90. In particular, the engaging groove 50 slides in cooperation with the first protruding portion 82 described later of the lock member 80, the second protruding portion 71 described later of the slide member 70, and the third protruding portion 91 described later of the holding member 90. Guides the movement of the member 70, the lock member 80, and the holding member 90. As shown in FIG. 5A, the engagement groove 50 is connected to the first portion 51 extending in the axial direction da and the front end portion of the first portion 51 and extends forward in the axial direction da, and the first portion is formed. The second portion 52, which is arranged so as to be offset in the circumferential direction dc with respect to the portion 51, is connected to the rear end portion of the first portion 51 and extends in the axial direction da toward the rear, and is circumferential with respect to the first portion 51. It has a third portion 53, which is arranged so as to be offset in the direction dc. In particular, in the illustrated example, the third portion 53 is arranged so as to be offset from the first portion 51 in the circumferential direction dc on the side opposite to the second portion 52.

The front end of the first portion 51 has a first guide surface 54 that guides the second protrusion 71 of the slide member 70, and the rear end of the first portion 51 has a third protrusion 91 of the holding member 90. It has a second guide surface 55 for guiding. The first guide surface 54 is inclined in the same direction as the first guided surface 75 of the slide member 70, which will be described later, with respect to the axial direction da and the circumferential direction dc. The inclination angle of the first guide surface 54 with respect to the axial direction da is preferably 30 degrees or more and 60 degrees or less. The second guide surface 55 is inclined in the same direction as the second guided surface 95 of the holding member 90, which will be described later, with respect to the axial direction da and the circumferential direction dc. The inclination angle of the second guide surface 55 with respect to the axial direction da is preferably 30 degrees or more and 60 degrees or less.

The rear end portion of the second portion 52 has a first pressure receiving surface 56 that is inclined in the same direction as the first pressing surface 73 of the second protruding portion 71 of the slide member 70 with respect to the axial direction da and the circumferential direction dc. The inclination angle of the first pressure receiving surface 56 with respect to the axial direction da is preferably 30 degrees or more and 60 degrees or less. The front end portion of the third portion 53 has a second pressure receiving surface 57 inclined in the same direction as the second pressing surface 93 of the third protruding portion 91 of the holding member 90 with respect to the axial direction da and the circumferential direction dc. The inclination angle of the second pressure receiving surface 57 with respect to the axial direction da is preferably 30 degrees or more and 60 degrees or less.

The radial depth of the first portion 51 of the front middle cylinder 46 from the central axis A is larger than the radial depth of the first portion 51 of the rear middle cylinder 48 from the central axis A. Therefore, a step portion 58 is formed between the first portion 51 of the front middle cylinder 46 and the first portion 51 of the rear middle cylinder 48.

The lock member 80 is arranged in the barrel 20 so as to be movable in the axial direction da. In particular, the lock member 80 is movable between the first locked position and the unlocked position, which will be described later, and is movable between the second locked position and the unlocked position, which will be described later. The lock member 80 has a first protruding portion 82 that can move in the engaging groove 50 on the outer peripheral surface of the front region thereof. In particular, the first protrusion 82 is movable along the axial da in the inside of the first portion 51 of the engagement groove 50. A plurality of first ridges 84 extending in the axial direction da are provided on the outer peripheral surface of the front region of the lock member 80. Further, a plurality of second ridges 86 extending in the axial direction da are provided on the outer peripheral surface of the rear region of the lock member 80.

The slide member 70 is located in front of the lock member 80. The slide member 70 has a plurality of second protruding portions 71 that can move in the engaging groove 50 on the outer peripheral surface of the rear end portion. In particular, the second protruding portion 71 is movable inside the first portion 51 and the second portion 52 of the engaging groove 50. The rear end portion of the second protruding portion 71 has a first pressing surface 73 that is inclined with respect to the axial direction da and the circumferential direction dc. The first pressing surface 73 presses the first pressure receiving surface 56 of the engaging groove 50 by the action of a force that pushes the cursive 16 backward when writing in the protruding state of the cursive 16. The inclination angle of the first pressing surface 73 with respect to the axial direction da is preferably 30 degrees or more and 60 degrees or less. Further, the difference between the inclination angle of the first pressing surface 73 with respect to the axial direction da and the inclination angle of the first pressure receiving surface 56 of the engaging groove 50 with respect to the axial direction da is preferably 15 degrees or less. The front end portion of the second protruding portion 71 has a first guided surface 75 that is inclined with respect to the axial direction da and the circumferential direction dc. When the user holds the writing instrument 10 so that the writing unit 17 faces downward during writing, the slide member 70 moves forward along the axial direction da by the action of gravity. After that, the first guided surface 75 is guided along the first guide surface 54 of the engaging groove 50, so that the slide member 70 further moves forward along the axial direction da and also in the circumferential direction dc. Rotate. The inclination angle of the first guided surface 75 with respect to the axial direction da is preferably 30 degrees or more and 60 degrees or less.

The radial height of the second protrusion 71 from the central axis A is larger than the radial depth of the first portion 51 of the rear middle cylinder 48 from the central axis A, and the first portion 51 of the front middle cylinder 46. It is smaller than the radial depth from the central axis A of. As a result, the second protruding portion 71 can move in the first portion 51 of the front middle cylinder 46 in the axial direction da, but cannot enter the first portion 51 of the rear middle cylinder 48.

The slide member 70 has an opening 76 at the front end. Further, on the inner peripheral surface of the slide member 70, a plurality of first concave grooves 77 extending in the axial direction da and opening toward the rear side are provided. The inner diameter of the opening 76 is larger than the outer diameter of the protrusion of the first protrusion 84 of the lock member 80. Therefore, the first ridge 84 can enter the inside of the slide member 70 through the opening 76 of the slide member 70. The inner diameter of the groove portion of the slide member 70 in the region having the first concave groove 77 is larger than the outer diameter of the protrusion portion in the region of the lock member 80 having the first protrusion 84. Further, the inner diameter of the slide member 70 other than the groove portion in the region having the first concave groove 77 is smaller than the outer diameter of the protrusion portion in the region having the first protrusion 84 of the lock member 80, and the lock member 80 is the first. It is larger than the outer diameter other than the protrusion in the region having one protrusion 84. As a result, depending on the relative position (relative angle) of the locking member 80 and the slide member 70 in the circumferential direction dc, at least a part of the front side of the first ridge 84 can or cannot enter the first concave groove 77. There are cases. In particular, in the present embodiment, when the lock member 80 is located at the first lock position, at least a part of the first ridge 84 is located in the first concave groove 77 of the slide member 70, and the lock member 80 is located. When located in the unlocked position, the first ridge 84 is not located in the first recess 77.

The holding member 90 is located behind the lock member 80 and has a function of holding the friction member. The holding member 90 has a plurality of third protruding portions 91 that can move in the engaging groove 50 of the shaft cylinder 20 on the outer peripheral surface of the front end portion thereof. In particular, the third protrusion 91 is movable inside the first portion 51 and the third portion 53 of the engagement groove 50. The front end portion of the third protruding portion 91 has a second pressing surface 93 that is inclined with respect to the axial direction da and the circumferential direction dc. The second pressing surface 93 is the second pressing surface 57 of the engaging groove 50 due to the action of a force that pushes the friction member 15 forward when the friction member 15 fixed to the holding member 90 rubs the handwriting. Press. The inclination angle of the second pressing surface 93 with respect to the axial direction da is preferably 30 degrees or more and 60 degrees or less. Further, the difference between the inclination angle of the second pressing surface 93 with respect to the axial direction da and the inclination angle of the second pressure receiving surface 57 of the engaging groove 50 with respect to the axial direction da is preferably 15 degrees or less. The rear end of the third protrusion 91 has a second guided surface 95 that is inclined with respect to the axial da and the circumferential dc. When the user holds the writing tool 10 so that the friction member 15 faces downward when rubbing the handwriting, the holding member 90 moves backward along the axial direction da by the action of gravity. After that, the second guided surface 95 is guided along the second guide surface 55 of the engaging groove 50, so that the holding member 90 further moves rearward along the axial direction da and also in the circumferential direction dc. Rotate. The inclination angle of the second guided surface 95 with respect to the axial direction da is preferably 30 degrees or more and 60 degrees or less.

The holding member 90 has an opening 96 at the front end. Further, on the inner peripheral surface of the holding member 90, a plurality of second concave grooves 97 extending in the axial direction da and opening toward the front side are provided. The inner diameter of the opening 96 is larger than the outer diameter of the protrusion of the second protrusion 86 of the lock member 80. Therefore, the second ridge 86 can enter the inside of the holding member 90 through the opening 96 of the holding member 90. The inner diameter of the groove portion of the holding member 90 in the region having the second concave groove 97 is larger than the outer diameter of the protrusion portion in the region of the lock member 80 having the second ridge 86. Further, the inner diameter of the holding member 90 other than the groove portion in the region having the second concave groove 97 is smaller than the outer diameter of the protrusion portion in the region having the second ridge 86 of the lock member 80, and the lock member 80 is the first. It is larger than the outer diameter other than the protrusion in the region having the two protrusions 86. As a result, depending on the relative position (relative angle) of the locking member 80 and the holding member 90 in the circumferential direction dc, at least a part of the rear side of the second ridge 86 can or cannot enter the second concave groove 97. There are cases. In particular, in the present embodiment, when the lock member 80 is located at the second lock position, at least a part of the second ridge 86 is located in the second concave groove 97 of the holding member 90, and the lock member 80 is located. When located in the unlocked position, the second ridge 86 is not located in the second recess 97. Further, a holding portion 99 for holding the friction member 15 is formed on the inner peripheral surface of the rear region of the holding member 90. The friction member 15 is held so as not to rotate and to move back and forth with respect to the holding portion 99 of the holding member 90.

The friction member 15 is a member for rubbing handwriting with ink. When the ink is a heat-discolorable ink, the friction member 15 has a function of rubbing the writing surface of paper or the like on which the handwriting is formed and heating the ink forming the handwriting by frictional heat. In this case, the friction member 15 can be formed from, for example, an elastic material, and can be fixed to the holding portion 99 of the holding member 90 by press fitting, engaging, screwing, fitting, bonding, two-color molding, or the like. When the ink is an ink that does not have thermal discoloration, the friction member 15 is, for example, a member that scrapes off the handwriting by rubbing the writing surface such as paper on which the handwriting is formed, for example, a sand eraser. , May be.

As shown in FIGS. 1 and 2, in the writing tool 10 of the present embodiment, when the friction member 15 is directed upward, the rear end of the friction member 15 is a shaft cylinder 20 regardless of whether it is in a protruding state or an immersed state. It does not protrude rearward from the rear end of (rear end cap 47). In other words, the rear end of the friction member 15 coincides with the rear end of the shaft cylinder 20 or is located in front of the rear end of the shaft cylinder 20 at a position along the axial direction da. This makes it possible to prevent the friction member 15 from becoming dirty or damaged.

Next, the haunting motion of the cursive 16 in the writing instrument 10 will be described. The writing tool 10 is configured to be able to alternately switch between the immersive state shown in FIG. 1 and the protruding state shown in FIG. In the example shown in FIG. 1, the movement of the cursive body 16 in the axial direction da is restricted by the piece member 22 in the immersive state. Specifically, as shown in FIG. 3A, the abutting portion 26 of the elastic piece 24 of the piece member 22 abuts on the cursive 16 via the hole 38 of the barrel 20 (front shaft 30). The frictional force acting between the abutting portion 26 and the cursive 16 restricts the movement of the cursive 16 in the axial direction.

When the user rotates the piece member 22 in the circumferential direction dc by a predetermined angle, particularly clockwise in FIG. 3A, the elastic piece 24 rides on the barrel 20 as shown in FIG. 3B. As a result, the elastic piece 24 is deformed so that the contact portion 26 moves toward the outside of the radial direction dr. Therefore, the contact portion 26 is separated from the cursive body 16, and the frictional force acting between the contact portion 26 and the cursive body 16 is released. As a result, when the front of the writing instrument 10 faces downward, the cursive 16 moves forward due to the action of gravity.

Next, an example of the locking operation of the slide member 70 in the writing tool 10 will be described. In the present embodiment, when the lock member 80 is positioned at the first lock position, the movement of the slide member 70 in the axial direction da is restricted, and the lock member 80 is positioned at a non-lock position behind the first lock position. When doing so, the movement of the slide member 70 in the axial direction da is allowed. In other words, the position of the lock member 80 when the movement of the slide member 70 in the axial direction da is restricted is the non-locking position, and the lock member 80 when the movement of the slide member 70 in the axial direction da is permitted. It can be said that the position of is the unlocked position.

This locking operation will be described in detail with reference to FIGS. 5A to 7B. FIG. 5A shows the engagement groove 50, the first protrusion 82 of the lock member 80, the second protrusion 71 of the slide member 70, and the third protrusion 91 of the holding member 90 when the lock member 80 is in the unlocked position. FIG. 5B is a diagram showing a positional relationship between the first protrusion 84 of the lock member 80, the first concave groove 77 of the slide member 70, and the second concave groove 97 of the holding member 90. Is. FIG. 6A is a diagram showing the positional relationship between the engaging groove 50 and the first protruding portion 82, the second protruding portion 71, and the third protruding portion 91 when the locking member 80 is in the unlocked position, and is FIG. 6B. Is a diagram showing the positional relationship between the first protrusion 84, the first concave groove 77, and the second concave groove 97. FIG. 7A is a diagram showing the positional relationship between the engaging groove 50 and the first protruding portion 82, the second protruding portion 71, and the third protruding portion 91 when the lock member 80 is in the first lock position. FIG. 7B is a diagram showing the positional relationship between the first protrusion 84, the first concave groove 77, and the second concave groove 97. 5A to 7B are views of the engaging groove 50, the first protruding portion 82, the second protruding portion 71, and the third protruding portion 91 as viewed from the outside of the barrel 20.

As shown in FIG. 5A, when the lock member 80 is in the unlocked position, the first protrusion 82 of the lock member 80 and the second protrusion 71 of the slide member 70 are both engaged grooves 50. It is located in the first part 51 of. Further, as shown in FIG. 5B, the first ridge 84 of the lock member 80 and the first concave groove 77 of the slide member 70 are positioned so as to be offset from each other in the circumferential direction dc, and the first ridge 84 does not enter the first concave groove 77. In the state shown in FIGS. 5A and 5B, the movement of the slide member 70 in the axial direction da is permitted.

When the lock member 80 and the slide member 70 move further forward along the first portion 51 of the engagement groove 50 due to the action of gravity, the second protrusion 71 of the slide member 70 moves forward as shown in FIG. 6A. It reaches the front end of the first portion 51 of the engagement groove 50. As shown in FIG. 6B, the first ridge 84 of the lock member 80 and the first concave groove 77 of the slide member 70 are positioned so as to be offset from each other in the circumferential direction dc, and the first ridge 84 is located. , Does not enter the first concave groove 77. In the state shown in FIGS. 6A and 6B, the movement of the slide member 70 in the axial direction da is permitted. Therefore, it can be said that the lock member 80 is in the unlocked position even in the state shown in FIGS. 6A and 6B.

In the state shown in FIG. 6A, the slide member 70 further moves forward in the axial direction da due to the action of gravity. Here, the second protruding portion 71 of the slide member 70 has a first guided surface 75 inclined with respect to the axial direction da and the circumferential direction dc at the front end portion thereof. Further, the first portion 51 of the engaging groove 50 has a first guide surface 54 for guiding the second protruding portion 71 at the front end portion thereof. In particular, in the illustrated example, the first guide surface 54 is inclined in the same direction as the first guided surface 75 of the slide member 70 with respect to the axial direction da and the circumferential direction dc. As a result, the first guided surface 75 of the second protruding portion 71 is guided along the first guide surface 54 of the engaging groove 50. The slide member 70 further moves forward along the axial da and also rotates in the circumferential direction dc (around the central axis A), whereby the second protrusion 71 becomes the second portion 52 of the engagement groove 50. It will be located (see FIG. 7A).

As the slide member 70 rotates in the circumferential direction dc, as shown in FIG. 7B, the position of the circumferential dc between the first ridge 84 of the lock member 80 and the first concave groove 77 of the slide member 70 is set. Consistent. That is, the first ridge 84 and the first concave groove 77 are arranged along the axial direction da so as to be in a straight line. As a result, the first ridge 84 can enter the first concave groove 77, and the front end (front tip) of the first ridge 84 hits the front end (front innermost part) of the first concave groove 77. Until it comes into contact, the lock member 80 moves forward by the action of gravity and is located at the first lock position. In the illustrated example, when the front end of the first ridge 84 abuts on the front end of the first recess 77, the lock member 80 does not move further forward. That is, the lock member 80 is located at the front end in the movable range of the axial da of the lock member 80 in a state where the front end of the first ridge 84 is in contact with the front end of the first concave groove 77.

When the first ridge 84 enters the first concave groove 77, the rotation of the slide member 70 in the circumferential direction dc is restricted. Therefore, even if the cursive 16 is pressed backward, the movement of the second protruding portion 71 of the slide member 70 from the second portion 52 of the engaging groove 50 to the first portion 51 is also restricted. In this case, the second pressing surface 93 of the second protruding portion 71 presses the first pressure receiving surface 56 of the second portion 52 of the engaging groove 50 by the force of pressing the cursive 16 backward. Then, the first pressure receiving surface 56 supports the second pressing surface 93, so that the cursive body 16 is restricted from moving backward along the axial direction da. Not only the position where the front end of the first ridge 84 abuts on the front end of the first concave groove 77, but also at least a part of the first ridge 84 is located in the first concave groove 77, whereby the slide member 70 If the rotation of the dc in the circumferential direction is restricted and the forward movement of the cursive 16 along the axial direction da is restricted, it can be said that the lock member 80 is located at the first lock position.

In the state shown in FIGS. 7A and 7B, the movement of the cursive 16 in the axial direction da is restricted. Therefore, even if the writing portion 17 of the writing body 16 is pressed against the writing surface such as paper when writing, the writing body 16 is suppressed from moving into the barrel 20, so that writing can be easily performed. Can be done.

Further, in the state shown in FIGS. 7A and 7B, the rotation of the cursive 16 in the circumferential direction dc is also restricted. Therefore, it is also possible to prevent the cursive 16 from rotating in the circumferential direction when writing, so that writing can be performed more easily.

It should be noted that writing does not necessarily have to be performed in a state where the central axis A of the writing tool 10 is parallel to the vertical direction as shown in FIG. As an example, when the writing instrument 10 is held so that the writing unit 17 is located downward and the central axis A extends in a direction having an angle of 0 degrees or more and 60 degrees or less with respect to the vertical direction, the lock member The writing instrument 10 may be configured so that the 80 can be moved to the first lock position. For example, by adjusting the material or dimensions of the lock member 80, the slide member 70, and the middle cylinders 46, 48, the roughness of the surface, etc., the lock member 80 is locked when the central axis A is within a desired angle range with respect to the vertical direction. The member 80 can be made movable to the first lock position.

Next, an example of the locking operation of the friction member 15 and the holding member 90 in the writing tool 10 will be described. FIG. 8 is a vertical cross-sectional view showing the writing tool 10 with the rear end portion facing down.

When rubbing the handwriting, as shown in FIG. 8, the writing instrument 10 is inverted so that the friction member 15 of the writing instrument 10 comes into contact with the writing surface such as paper. In particular, the writing tool 10 is held so that the friction member 15 faces downward. When the piece member 22 is in the unregulated state, the lock member 80 moves rearward due to the action of gravity. Along with this, the first ridge 84 of the lock member 80 comes out of the first concave groove 77 of the slide member 70. As a result, the slide member 70 can rotate in the circumferential direction dc. At this time, the first pressing surface 73 of the second protruding portion 71 is guided along the first pressure receiving surface 56 of the second portion 52 of the engaging groove 50 by the own weight of the slide member 70, and the slide member 70 is moved in the circumferential direction dc. The second protrusion 71 rotates and moves into the first portion 51 of the engaging groove 50. The cursive 16, slide member 70, and lock member 80 move further rearward due to their own weight. Therefore, the restriction on the movement of the writing body 16 and the slide member 70 in the axial direction is released only by reversing the writing instrument 10 so that the writing unit 17 faces upward. When the piece member 22 is in the restricted state, the restriction on the movement of the slide member 70 in the axial direction is released, but the cursive body 16 is restricted by the piece member 22 in the movement in the axial direction. Do not move backwards. Further, as shown in FIG. 8, when the friction member 15 is turned downward, the lock member 80, the holding member 90, and the friction member 15 move backward due to the action of gravity. In the present embodiment, when the lock member 80 is located at the second lock position, the movement of the holding member 90 in the axial direction da is restricted, and the lock member 80 is located at the non-lock position on the front side of the second lock position. Occasionally, axial da movement of the holding member 90 is allowed. In other words, the position of the lock member 80 when the movement of the holding member 90 in the axial direction da is restricted is the second lock position, and the lock member when the movement of the holding member 90 in the axial direction da is permitted. It can be said that the position of 80 is the unlocked position.

This locking operation will be described in detail with reference to FIGS. 9A to 11B. FIG. 9A shows the engagement groove 50 of the barrel 20 and the first protrusion 82 of the lock member 80, the second protrusion 71 of the slide member 70, and the holding member 90 when the lock member 80 is in the unlocked position. 3 It is a figure which shows the positional relationship with the protrusion 91, and FIG. 9B shows the position of the 2nd ridge 86 of a lock member 80, the 1st concave groove 77 of a slide member 70, and the 2nd concave groove 97 of a holding member 90. It is a figure which shows the relationship. FIG. 10A is a diagram showing the positional relationship between the engaging groove 50 and the first protrusion 82 and the third protrusion 91 when the lock member 80 is in the unlocked position, and FIG. 10B is a diagram showing the positional relationship between the engagement groove 50 and the second protrusion 91. It is a figure which shows the positional relationship between 86, the 1st concave groove 77, and the 2nd concave groove 97. FIG. 11A is a diagram showing the positional relationship between the engaging groove 50 and the first protrusion 82 and the third protrusion 91 when the lock member 80 is in the second lock position, and FIG. 11B is a diagram showing the positional relationship between the engagement groove 50 and the third protrusion 91. It is a figure which shows the positional relationship between the Article 86, the 1st concave groove 77, and the 2nd concave groove 97. 9A to 11B are views of the engaging groove 50, the first protruding portion 82, and the third protruding portion 91 as viewed from the outside of the barrel 20.

As shown in FIG. 9A, when the lock member 80 is in the unlocked position, the first protrusion 82 of the lock member 80 and the third protrusion 91 of the holding member 90 are both engaged grooves 50. It is located in the first part 51 of. Further, as shown in FIG. 9B, the second ridge 86 of the lock member 80 and the second concave groove 97 of the holding member 90 are positioned so as to be offset from each other in the circumferential direction dc, and the second ridge 86 does not enter the second concave groove 97. In the state shown in FIGS. 9A and 9B, the movement of the holding member 90 in the axial direction da is permitted.

When the locking member 80 and the holding member 90 move further rearward along the first portion 51 of the engaging groove 50 due to the action of gravity, the third protruding portion 91 of the holding member 90 moves as shown in FIG. 10A. It reaches the rear end of the first portion 51 of the engagement groove 50. As shown in FIG. 10B, the second ridge 86 of the lock member 80 and the second concave groove 97 of the holding member 90 are positioned so as to be offset from each other in the circumferential direction dc, and the second ridge 86 is located. , Do not enter the second concave groove 97. In the state shown in FIGS. 10A and 10B, the movement of the holding member 90 in the axial direction da is permitted. Therefore, it can be said that the lock member 80 is in the unlocked position even in the state shown in FIGS. 10A and 10B.

In the present embodiment, a step portion 58 is formed between the first portion 51 of the front middle cylinder 46 and the first portion 51 of the rear middle cylinder 48. Further, the radial height of the second protruding portion 71 of the slide member 70 from the central axis A is larger than the radial depth of the first portion 51 of the rear middle cylinder 48 from the central axis A, and the front middle cylinder 48. It is smaller than the radial depth from the central axis A of the first portion 51 in 46. Therefore, the second protruding portion 71 can move in the axial direction da in the first portion 51 of the front middle cylinder 46, but cannot enter the first portion 51 of the rear middle cylinder 48. As a result, the slide member 70 stops in a state where the second protruding portion 71 is in contact with the step portion 58.

In the state shown in FIG. 10A, the holding member 90 further moves rearward in the axial direction da due to the action of gravity. Here, the third protruding portion 91 of the holding member 90 has a second guided surface 95 inclined with respect to the axial direction da and the circumferential direction dc at the rear end portion. Further, the first portion 51 of the engaging groove 50 has a second guide surface 55 for guiding the third protruding portion 91 at the rear end portion. In particular, in the illustrated example, the second guide surface 55 is inclined in the same direction as the second guided surface 95 of the holding member 90 with respect to the axial direction da and the circumferential direction dc. As a result, the second guided surface 95 of the third protrusion 91 is guided along the second guide surface 55 of the engaging groove 50. The holding member 90 further moves rearward along the axial direction da and also rotates in the circumferential direction dc (around the central axis A), whereby the third protrusion 91 becomes the third portion 53 of the engagement groove 50. It will be located (see FIG. 11A).

As the holding member 90 rotates in the circumferential direction dc, as shown in FIG. 11B, the position of the circumferential dc between the second ridge 86 of the lock member 80 and the second concave groove 97 of the holding member 90 is set. Consistent. That is, the second ridge 86 and the second concave groove 97 are arranged along the axial direction da so as to be in a straight line. As a result, the second ridge 86 can enter the second concave groove 97, and the rear end (rear tip) of the second ridge 86 is the rear end (rear innermost part) of the second concave groove 97. The lock member 80 moves rearward due to the action of gravity until it comes into contact with the second lock position. In the illustrated example, when the rear end of the second ridge 86 abuts on the rear end of the second recess 97, the lock member 80 does not move further rearward. That is, the lock member 80 is located at the rear end in the movable range of the axial da of the lock member 80 in a state where the rear end of the second ridge 86 is in contact with the rear end of the second concave groove 97.

When the second ridge 86 enters the second concave groove 97, the rotation of the holding member 90 in the circumferential direction dc is restricted. Therefore, even if the friction member 15 and the holding member 90 are pressed forward, it is also restricted that the third protruding portion 91 of the holding member 90 moves from the third portion 53 of the engaging groove 50 to the first portion 51. To. In this case, the second pressing surface 93 of the third protruding portion 91 presses the second pressure receiving surface 57 of the third portion 53 of the engaging groove 50 by the force of pressing the friction member 15 and the holding member 90 forward. .. Then, by supporting the second pressing surface 93 by the second pressure receiving surface 57, the forward movement of the friction member 15 and the holding member 90 along the axial direction da is restricted. Not only the position where the rear end of the second ridge 86 abuts on the rear end of the second concave groove 97, but also at least a part of the second ridge 86 is located in the second concave groove 97 and is held by this. If the rotation of the circumferential dc of the member 90 is restricted and the forward movement of the friction member 15 and the holding member 90 along the axial da is restricted, the lock member 80 is positioned at the second lock position. I can say.

In the state shown in FIGS. 11A and 11B, the movement of the friction member 15 and the holding member 90 in the axial direction da is restricted. Therefore, even if the friction member 15 is pressed against the writing surface such as paper in order to rub the handwriting with the friction member 15, the friction member 15 is suppressed from moving into the barrel 20, so that the friction of the handwriting Can be easily performed.

Further, in the state shown in FIGS. 11A and 11B, the rotation of the friction member 15 and the holding member 90 in the circumferential direction dc is also restricted. Therefore, when the handwriting is rubbed, the friction member 15 is also suppressed from rotating in the circumferential direction, so that the handwriting can be rubbed more easily.

When the writing tool 10 is inverted so that the friction member 15 faces upward (the writing unit 17 faces downward) from the state shown in FIG. 8, when the piece member 22 is in the unregulated state, it locks. The member 80 moves forward by the action of gravity. Along with this, the second ridge 86 of the lock member 80 comes out of the second concave groove 97 of the holding member 90. As a result, the holding member 90 can rotate in the circumferential direction dc. At this time, the second pressing surface 93 of the third protruding portion 91 is guided along the second pressure receiving surface 57 of the third portion 53 of the engaging groove 50 by the own weight of the holding member 90, and the holding member 90 is moved in the circumferential direction dc. The third protrusion 91 rotates and moves into the first portion 51 of the engaging groove 50. The friction member 15, the holding member 90, and the lock member 80 move further forward by their own weight. Therefore, the restriction on the movement of the friction member 15 and the holding member 90 in the axial direction is released only by reversing the writing tool 10 so that the friction member 15 faces upward.

It should be noted that the friction of the handwriting does not necessarily have to be performed in a state where the central axis A of the writing tool 10 is parallel to the vertical direction as shown in FIG. As an example, when the friction member 15 is located below and the writing tool 10 is held so that the central axis A extends in a direction having an angle of 0 degrees or more and 60 degrees or less with respect to the vertical direction, the lock member The writing tool 10 may be configured so that the 80 can be moved to the second lock position. For example, by adjusting the material or dimensions of the lock member 80, the holding member 90, and the friction member 15, the roughness of the surface, etc., the lock member 80 when the central axis A is within a desired angle range with respect to the vertical direction. Can be made movable to the second lock position.

It is possible to make various changes to the above-described embodiment.

In the above-described embodiment, an example in which a plurality of first ridges 84 are provided on the outer peripheral surface of the lock member 80 and a plurality of first concave grooves 77 are provided on the inner peripheral surface of the slide member 70 has been described. The location where the 1 ridge and the 1st concave groove are formed is not limited to this. For example, a plurality of first concave grooves may be provided on the outer peripheral surface of the lock member 80, and a plurality of first ridges may be provided on the inner peripheral surface of the slide member 70. Also in this case, as described in the above-described embodiment, when the lock member 80 is located in the unlocked position, the position of the first concave groove and the position of the first ridge are displaced in the circumferential direction dc. When the lock member 80 is located at the lock position, it is preferable that the position of the first concave groove and the position of the first ridge coincide with the circumferential direction dc.

Similarly, in the above-described embodiment, an example in which a plurality of second ridges 86 are provided on the outer peripheral surface of the lock member 80 and a plurality of second concave grooves 97 are provided on the inner peripheral surface of the holding member 90 has been described. However, the location where the second ridge and the second groove are formed is not limited to this. For example, a plurality of second concave grooves may be provided on the outer peripheral surface of the lock member 80, and a plurality of second ridges may be provided on the inner peripheral surface of the holding member 90. Also in this case, as described in the first embodiment, when the lock member 80 is located in the unlocked position, the position of the second concave groove and the position of the second ridge are displaced in the circumferential direction dc. When the lock member 80 is located at the lock position, it is preferable that the position of the second concave groove and the position of the second ridge coincide with the circumferential direction dc.

Further, in the above-described embodiment, an example in which the engaging groove 50 is provided on the inner peripheral surface of the shaft cylinder 20 (middle cylinders 46 and 48) and the second protruding portion 71 is provided on the slide member 70 has been described. The location where the engaging groove and the second protrusion are formed is not limited to this. For example, an engaging groove may be provided on the outer peripheral surface of the slide member 70, and a second protruding portion may be provided on the inner peripheral surface of the barrel 20.

The preferred configuration in this case is
The shaft cylinder has a sliding groove extending in the axial direction on the inner peripheral surface.
The slide member has an engaging groove on the outer peripheral surface and has an engaging groove on the outer peripheral surface.
The engaging groove is connected to a first portion extending in the axial direction and a front end portion of the first portion, extends axially toward the front, and is arranged so as to be displaced in the circumferential direction with respect to the first portion. With the second part,
The lock member has a first protrusion that can move inside the sliding groove.
The barrel has a second protruding portion on its inner peripheral surface that is movable inside the first portion and the second portion.

Similarly, in the above-described embodiment, an example in which the engaging groove 50 is provided on the inner peripheral surface of the shaft cylinder 20 (middle cylinders 46 and 48) and the third protruding portion 91 is provided on the holding member 90 has been described. , The place where the engaging groove and the third protrusion are formed is not limited to this. For example, an engaging groove may be provided on the outer peripheral surface of the holding member 90, and a third protruding portion may be provided on the inner peripheral surface of the barrel 20.

The preferred configuration in this case is
The shaft cylinder has a sliding groove extending in the axial direction on the inner peripheral surface.
The holding member has an engaging groove on the outer peripheral surface and has an engaging groove on the outer peripheral surface.
The engaging groove is connected to a first portion extending in the axial direction and a front end portion of the first portion, extends axially toward the front, and is arranged so as to be displaced in the circumferential direction with respect to the first portion. With the third part,
The lock member has a first protrusion that can move inside the sliding groove.
The barrel has a third protruding portion on its inner peripheral surface that is movable inside the first portion and the second portion.

10 Writing implements 15 Friction member 16 Cursive 17 Writing part 19 Rear end 20 Shaft cylinder 22 Piece member 24 Elastic piece 26 Contact part 30 Front shaft 32 Opening 34 Clip 36 Male screw part 38 Hole 40 Rear shaft 42 Female screw part 44 Opening 46 Front middle cylinder 47 Rear end cap 48 Rear middle cylinder 49 Inward protrusion 49
50 Engagement groove 51 First part 52 Second part 53 Third part 54 First guide surface 55 Second guide surface 56 First pressure receiving surface 57 Second pressure receiving surface 58 Step 60 Lock mechanism 70 Slide member 71 Second protrusion 73 First pressing surface 75 First guided surface 76 Opening 77 First concave groove 80 Lock member 82 First protruding portion 84 First protrusion 86 Second protrusion 90 Holding member 91 Third protruding portion 93 Second pressing surface 95 Second guided surface 96 Opening 97 Second concave groove 99 Holding part

Claims (15)

Axial tube and
The cursive placed in the barrel and
A lock member arranged behind the cursive so as to be movable in the axial direction of the barrel,
A slide member arranged between the cursive and the lock member is provided.
When the lock member is located at the first lock position, the axial movement of the slide member is restricted, and when the lock member is located at a non-lock position behind the first lock position, the above. A writing tool that allows the sliding member to move in the axial direction. The shaft cylinder has an engaging groove on the inner peripheral surface and has an engaging groove on the inner peripheral surface.
The engaging groove is connected to a first portion extending in the axial direction and a front end portion of the first portion, extends axially toward the front, and is arranged so as to be displaced in the circumferential direction with respect to the first portion. With the second part,
The lock member has a first protrusion that can move inside the first portion.
The writing tool according to claim 1, wherein the slide member has a second protruding portion that can move inside the first portion and the second portion. The writing tool according to claim 2, wherein when the lock member is located at the first lock position, the second protrusion is located inside the second portion. The rear end portion of the second protruding portion has a first pressing surface that is inclined with respect to the axial direction and the circumferential direction.
The writing tool according to claim 2 or 3, wherein the rear end portion of the second portion has a first pressure receiving surface that is inclined in the same direction as the first pressing surface with respect to the axial direction and the circumferential direction. The front end portion of the second protruding portion has a first guided surface that is inclined with respect to the axial direction and the circumferential direction.
The writing tool according to any one of claims 2 to 4, wherein the front end portion of the first portion has a first guide surface that is inclined in the same direction as the first guided surface with respect to the axial direction and the circumferential direction. .. The lock member has a first ridge extending axially in the front portion.
The slide member has a first concave groove extending in the axial direction on the inner peripheral surface.
When the lock member is located at the first lock position, at least a part of the first ridge is located in the first concave groove.
The writing tool according to any one of claims 1 to 5, wherein the first ridge is not located in the first concave groove when the locking member is located in the unlocked position. The writing tool according to any one of claims 1 to 6, wherein the first lock position is a front end in an axially movable range of the lock member. A holding member located behind the lock member and holding the friction member is further provided.
When the lock member is located at the second lock position, the axial movement of the holding member is restricted, and when the lock member is located at the non-lock position on the front side of the second lock position, the holding member is held. The writing tool according to any one of claims 1, 6 and 7, wherein the member is allowed to move in the axial direction. A holding member located behind the lock member and holding the friction member is further provided.
When the lock member is located at the second lock position, the axial movement of the holding member is restricted, and when the lock member is located at the non-lock position on the front side of the second lock position, the holding member is held. The writing tool according to any one of claims 2 to 5, wherein the member is allowed to move in the axial direction. The engaging groove has a third portion that is connected to the rear end portion of the first portion, extends in the axial direction toward the rear, and is arranged so as to be displaced in the circumferential direction with respect to the first portion. ,
The writing tool according to claim 9, wherein the holding member has a third protruding portion that can move inside the first portion and the third portion. The writing tool according to claim 10, wherein when the lock member is located at the second lock position, the third protrusion is located inside the third portion. The front end portion of the third protruding portion has a second pressing surface inclined with respect to the axial direction and the circumferential direction.
The writing tool according to any one of claims 9 to 11, wherein the front end portion of the third portion has a second pressure receiving surface that is inclined in the same direction as the second pressing surface with respect to the axial direction and the circumferential direction. The rear end portion of the third protruding portion has a second guided surface that is inclined with respect to the axial direction and the circumferential direction.
The method according to any one of claims 9 to 12, wherein the rear end portion of the first portion has a second guide surface that is inclined in the same direction as the second guided surface with respect to the axial direction and the circumferential direction. Writing utensils. The locking member has a second ridge extending axially in the rear portion.
The holding member has a second concave groove extending in the axial direction on the inner peripheral surface.
When the lock member is located at the second lock position, at least a part of the second ridge is located in the second recessed groove.
The writing tool according to any one of claims 9 to 13, wherein the second ridge is not located in the second recessed groove when the locking member is located in the unlocked position. The writing tool according to any one of claims 8 to 13, wherein the second lock position is a rear end in an axially movable range of the lock member.

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