JP2016016581A - Retractable writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retractable writing instrument capable of easily changing a state, and excellent in an appearance, when switching to a storage state from a writable state.SOLUTION: In a writable state, a fixing engaging part 68 of a connection part 22 is engaged with a fixed side engaging part 45 of a fixing part 21, and when switching to a storage state from the writable state, an operation engaging part 30 moves along an inclined plane 83 of an operation side engaging part 70 by moving an operation part 20 in the axial direction of a barrel 2, and the connection part 22 is also elastically deformed in response to the movement of the operation engaging part 30 and the operation side engaging part 70, and the fixing engaging part 68 of the connection part 22 moves in the separating direction to the fixed side engaging part 45 of the fixing part 21, so that an engaging state is released.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a writing instrument such as a marker or a ballpoint pen. In particular, the present invention relates to a retractable writing instrument.

2. Description of the Related Art Conventionally, there are known retractable writing instruments in which a pen tip protrudes from and into a shaft cylinder.
Among the retractable writing instruments, there is a slide-type writing instrument that has an operation piece on the outer peripheral surface of the shaft cylinder, and slides the operation piece in the axial direction of the shaft cylinder, thereby causing the pen tip to protrude from the shaft cylinder. (For example, patent document 1).

The slide-type writing instrument described in Patent Document 1 has an operation piece connected to a pen tip and a movable piece cut and raised from a shaft cylinder, and the operation piece engages with the movable piece, so that the pen The tip is held in a protruding posture protruding from the shaft tube. In addition, the sliding writing instrument described in Patent Document 1 has a structure in which the pen tip is held in the storage posture stored in the shaft cylinder by releasing the engagement state between the operation piece and the movable piece. Yes.
That is, in the sliding writing instrument described in Patent Document 1, writing is possible with the pen tip in the protruding posture, and adhesion to clothes or the like with the pen tip can be prevented in the retracted posture.

Japanese Patent No. 5323619

However, in the retractable writing instrument described in Patent Document 1, the user operates the movable piece in order to release the engagement between the operation piece and the movable piece when the posture is changed from the protruding posture to the storage posture. There is a need to. Therefore, the user needs to change the retractable writing instrument from the grip at the time of writing in order to change the posture.
Moreover, as for the retractable writing instrument of patent document 1, the above-mentioned movable piece is formed by raising and raising from a shaft cylinder. For this reason, when the movable piece is largely raised, the movable piece protrudes from the shaft tube, and the appearance is poor. Further, when writing, a finger or the like is easily caught on the movable piece, and the user may feel the movable piece in the way.
On the other hand, when the movable piece is cut and raised, the operation piece cannot be sufficiently engaged, and the engaged state may be released during writing. In addition, there is a problem that it is difficult for the user to press the movable piece with a finger and the engagement state is difficult to be released.
As described above, the retractable writing instrument described in Patent Literature 1 may feel troublesome for the user, and there is room for improvement.

  Then, this invention makes it a subject to change the state easily when switching from a writable state to an accommodation state, and to make it a subject to provide the retractable writing instrument excellent in the external appearance.

  In order to solve the above-described problem, the invention according to claim 1 is directed to a shaft tube gripped by a user, an operation unit operated by the user, a fixing unit integrated with the shaft tube, and a writing unit directly. Or it is a retractable writing instrument having a connecting part connected through another member, and by operating the operation part, the writing part in which a part of the writing part protrudes from the shaft tube, and the whole writing part is In the retractable writing instrument that can be switched between the housed state housed in the shaft tube, the operation part has an operation side engagement part, and the fixing part has a fixed side engagement part. The connection portion includes an operation engagement portion engageable with the operation side engagement portion, and a fixing engagement portion engageable with the fixed side engagement portion, and the operation side engagement portion Alternatively, at least one of the operation engaging portions has a first inclined surface that is inclined with respect to the axial direction. The fixed engaging portion is engaged with the fixed-side engaging portion of the fixed portion, and when the writing portion is switched from the writable state to the retracted state, the operating portion is moved in the axial direction of the shaft cylinder, The operation side engagement portion moves relative to the operation engagement portion along the first inclined surface, and the connection portion further includes the operation side engagement portion and the operation engagement portion. As the joint portion moves, it moves and / or elastically deforms, and the fixing engaging portion of the connecting portion moves in a direction away from the fixing side engaging portion of the fixing portion, so that the fixing engagement portion is moved. The retractable writing instrument, wherein the engagement state between the joint portion and the fixed side engaging portion is released.

  Here, “the operation side engagement portion moves relative to the operation engagement portion” means that the relative positional relationship of the operation side engagement portion with respect to the operation engagement portion is changed. The actual movement may be either one of the operation side engagement part and the operation engagement part, or both may move.

According to the configuration of the present invention, in the writable state, the fixing engaging portion of the connecting portion is engaged with the fixing side engaging portion of the fixing portion. That is, in the writable state, the connection portion and the fixing portion are integrated by the engagement relationship between the fixing engaging portion and the fixing side engaging portion. Therefore, the positional relationship between the fixed part integrated with the shaft cylinder and the connecting part connected to the writing part directly or via another member is fixed, and the writing part can be maintained in a writable state protruding from the shaft cylinder. .
Further, when switching from the writable state to the retracted state, the operation side engagement portion is moved relative to the operation engagement portion along the first inclined surface by moving the operation portion in the axial direction of the shaft tube. Move on. That is, the first inclined surface is formed in one of the operation side engaging portion or the operation engaging portion, and the other operation side engaging portion or the operation engaging portion relatively moves along the first inclined surface. .
Then, the connecting portion moves and / or elastically deforms along with the relative movement, and the fixing engaging portion moves in a direction away from the fixing side engaging portion. And the fixed engagement portion are released.
In other words, since the engagement state between the fixing engagement portion and the fixed-side engagement portion is released along with a series of operations in which the user operates the operation portion, the operation is performed when switching from the writable state to the retracted state. All that is required is the operation unit. Therefore, compared with the conventional case, the user can easily operate, and is less likely to get in the way when writing. In addition, since the operation unit is operated, there is no need to provide a movable piece or the like on the shaft cylinder as in Patent Document 1, and the appearance type writing instrument having an excellent appearance as compared with the prior art is obtained.

  The invention according to claim 2 is characterized in that the operation engaging portion and the fixing engagement portion are arranged at a predetermined interval in the axial direction of the shaft tube. It is a haunting type writing instrument.

  According to the configuration of the present invention, the distance between the operation engagement portion that receives the force from the operation side engagement portion of the operation portion and the fixation engagement portion that engages with the fixation side engagement portion of the fixation portion is increased. Therefore, the connection part receives a force from the operation side engagement part, and a part of the connection part is easily bent, and the fixing engagement part is easy to move in a direction away from the fixed side engagement part. Therefore, it is easy to release the engaged state by operating the operation unit, and smooth switching between the writable state and the stored state is possible.

  According to a third aspect of the present invention, the operation portion includes a slide engagement portion at a position separated in the axial direction of the shaft cylinder with respect to the operation side engagement portion, and the connection portion includes the storage portion. In the state, it has a connection side engagement portion that can be engaged with the slide engagement portion, and when switching from the housed state to the writing enabled state, by moving the operation portion in the axial direction of the shaft cylinder, The operation portion is configured such that the slide engagement portion engages with the connection side engagement portion and moves integrally with the connection portion. The movement of the connection portion and the slide engagement portion causes the fixed side engagement. The retractable writing instrument according to claim 1 or 2, wherein the joint portion and the fixing engaging portion are engaged with each other.

According to the configuration of the present invention, when switching from the stored state to the writable state, the operating portion moves integrally with the connecting portion by engaging the slide engaging portion with the connecting side engaging portion. In conjunction with the movement, the fixed side engaging portion and the fixing engaging portion engage with each other. That is, in conjunction with the operation of the operation unit, the storage state is switched to the writable state, so that it is possible to easily change from the stored state to the writable state.
Therefore, since the state can be switched by operating the operation unit at the time of switching, there is no need for the user to change the state. Therefore, the writing part can be taken in and out by sliding the operation part with the fingertip without holding it.

  In the above-described invention, when switching from the stored state to the writable state, the operation portion moves integrally with the connection portion by the sliding engagement portion coming into contact with a part of the connection side engagement portion. The fixed side engaging portion and the fixing engaging portion may be engaged with each other as the connecting portion and the sliding engaging portion move.

  According to a fourth aspect of the present invention, at least one of the fixed side engaging portion and the fixing engaging portion has a second inclined surface inclined with respect to the axial direction, and switches from the stored state to the writable state. In this case, by moving the operation portion in the axial direction of the shaft cylinder, the fixing engagement portion moves relative to the fixed-side engagement portion along the second inclined surface, A part of the connecting portion is elastically deformed so that the fixing engaging portion is separated from the fixing side engaging portion, and the fixing engaging portion and the fixing side are further restored by the restoring force of the connecting portion accompanying the elastic deformation. The retractable writing instrument according to any one of claims 1 to 3, wherein the engaging portion is in an engaged state.

  According to the configuration of the present invention, when switching from the stored state to the writable state, the fixing engaging portion and the fixed side engaging portion are engaged with each other in conjunction with the operation of the operation portion, and the writing is enabled. Since it is fixed, it is possible to easily change from the stored state to the writable state.

  According to a fifth aspect of the present invention, each of the operating side engaging portion and the operating engaging portion has a first inclined surface that is inclined with respect to the axial direction of the shaft cylinder, and is changed from a writable state to a stored state. When switching, the first inclined surface of the operating side engaging portion and the first inclined surface of the operating engaging portion are abutted, and a part of the axial pressing force applied to the operating portion is applied to the connecting portion. 5. A part of the connecting portion is elastically deformed so that the fixing engaging portion is separated from the fixing side engaging portion by the transmitted pressing force. It is a haunting type writing instrument described in.

  According to the configuration of the present invention, the first inclined surfaces of the operating side engaging portion and the operating engaging portion are brought into contact with each other, and the fixing engaging portion is fixed to the fixed side engagement by a part of the pressing force applied to the operating portion. Separate from the joint. Therefore, the state change from the writable state to the stored state becomes smoother.

  According to a sixth aspect of the present invention, when switching from the writable state to the retracted state, the first inclined surface of the operation side engaging portion and the first inclined surface of the operation engaging portion are abutted, and the operation side 6. The retractable writing instrument according to claim 5, wherein a gap is formed between the first inclined surface of the engaging portion and the first inclined surface of the operating engaging portion.

  According to the configuration of the present invention, since the gap is formed, it is possible to suppress the frictional resistance between the first inclined surfaces of the operation side engagement portion and the operation engagement portion, and the operation can be performed more smoothly. .

  The invention according to claim 7 is characterized in that an angle of the first inclined surface of the operation side engaging portion with respect to the axial direction is different from an angle of the first inclined surface of the operating engaging portion with respect to the axial direction. The retractable writing instrument according to claim 5 or 6.

  According to the configuration of the present invention, the first inclined surfaces of the operation side engagement portion and the operation engagement portion are less likely to be in surface contact with each other and more easily move.

  Invention of Claim 8 has a core member provided with the said writing part, and the said core member is rod shape, The edge part is connected with the said connection part, The said operation part and connection part Are formed along the outer peripheral surface of the core member, The retractable writing instrument according to any one of claims 1 to 7.

  According to the structure of this invention, since it engages with the outer peripheral surface of a core member, it is possible to enlarge the space which installs a core member, and a thick core member can be used. Therefore, for example, in the case of a ballpoint pen, a core member having a large amount of ink can be used.

  According to the retractable writing instrument of the present invention, the state can be easily changed when switching from the writable state to the retracted state, and the appearance is superior to the conventional one.

It is a perspective view of the retractable writing instrument which concerns on 1st Embodiment of this invention. It is a disassembled perspective view of the retractable writing instrument of FIG. It is explanatory drawing of the retractable writing instrument of FIG. 1, (a) is sectional drawing in a writing-ready state, (b) is sectional drawing in an accommodation state. It is a disassembled perspective view of the axial cylinder of FIG. It is a disassembled perspective view of the principal part of the retractable writing instrument of FIG. FIG. 6 is a perspective view of an operation unit viewed from a direction different from that in FIG. 5. It is a side view of the operation part of FIG. FIG. 6 is a perspective view of a fixing unit in FIG. 5. It is a side view of the fixing | fixed part of FIG. It is a side view of the connection part of FIG. It is the side view which permeate | transmitted and showed the axial cylinder at the time of switching from the accommodation state of the retractable writing instrument of FIG. 1 to a writable state, (a) represents a stowed state, (b) changed from a stowed state to a writable state. This represents a process of changing, and (c) represents a writable state. It is the side view which permeate | transmitted and showed the axial cylinder at the time of switching from the writable state writing instrument of FIG. 1 to a storage state, (a) represents a writable state, (b), (c) is writable The process of changing from the state to the storage state is shown, and (d) shows the storage state.

  Hereinafter, embodiments of the present invention will be described in detail. In the following description, the front-rear relationship will be described with the pen tip side as the front side and the pen shaft side as the rear side.

  The retractable writing instrument 1 of the first embodiment is specifically a slide-type ballpoint pen, and as shown in FIGS. 1 and 2, a shaft cylinder 2, a core member 3, an elastic member 4, and an operation unit. 20, a fixed portion 21, and a connecting portion 22.

Further, in the retractable writing instrument 1, the core member 3 moves along the axial direction L of the shaft tube 2 when the user operates the operation unit 20, and the front end portion of the core member 3 as shown in FIG. The pen tip 7 (writing portion) provided on the inner and outer sides of the shaft cylinder 2 is projected and retracted.
That is, the retractable writing instrument 1 is in a writable state (protruding posture) in which a part of the pen tip 7 shown in FIG. 3A protrudes from the shaft cylinder 2 and the entire pen tip 7 shown in FIG. Can be switched between the storage state (storage posture) stored in the shaft cylinder 2.

The shaft cylinder 2 is a part that is mainly gripped by the user during writing, and has an opening 8 through which the pen tip 7 can pass as shown in FIG.
The shaft cylinder 2 is formed by a front end forming part 10, a main body cylinder part 11, and an end face forming part 9.

  The front end forming portion 10 is a portion called a so-called tip plug, and the outer shape is a portion having a substantially truncated cone shape. That is, the outer peripheral surface of the front end forming portion 10 is tapered from the rear side to the front end portion, and the opening 8 is located at the apex (front end surface).

The front end forming portion 10 has a fixing connection portion 14 that can be connected to the fixing portion 21.
The fixing connection portion 14 is a portion that can be connected to the front cylindrical portion 40 (see FIG. 5) of the fixing portion 21. Specifically, the fixing connecting portion 14 can be fitted on the outside of the front cylindrical portion 40 of the fixing portion 21. It is a part.

The main body cylinder portion 11 is a long cylindrical body as shown in FIG. 4, and has an operation hole 13 which is provided on the outer peripheral surface thereof and penetrates in the axial direction L in the member thickness direction.
The “intermediate part” here refers to a part other than the end part. That is, it is a portion corresponding to the middle of the main body cylinder portion 11.
The operation hole 13 has an approximately rectangular opening shape, and its long side faces the axial direction L. That is, it can be said that the operation hole 13 is a through groove extending in the longitudinal direction.
The operation hole 13 is formed in the vicinity of the front end portion of the main body cylinder portion 11 in the axial direction L.
The length in the axial direction L of the operation hole 13 is longer than the length in the axial direction L of the pressing portion 25 of the operation portion 20 shown in FIG.
The width of the operation hole 13 is approximately the same as the width of the pressing portion 25 of the operation unit 20.

  The end surface forming part 9 is a part that forms the rear end face of the main body cylinder part 11 and is a part that closes the internal space of the main body cylinder part 11.

The core member 3 is a so-called refill, and extends in a rod shape in a predetermined direction (front-rear direction). As shown in FIG. 2, the core member 3 is formed of an ink containing portion 15 and a pen tip 7 (writing portion).
The ink storage portion 15 is a cylindrical portion and can store ink therein. The ink containing portion 15 has an elastic fixing portion 16 capable of fixing the elastic member 4 to the front end portion (the pen tip 7 side).
The elastic fixing portion 16 is a portion where the elastic member 4 can be attached to the outer peripheral surface thereof, and is a portion whose diameter is reduced compared to other portions of the ink containing portion 15.
The pen tip 7 is a part where the ink stored in the ink storage unit 15 can be applied to a writing object such as paper.
The ink container 15 and the pen tip 7 are integrally connected in the axial direction L.

The elastic member 4 is a known compression coil spring, and is a member that exerts an elastic restoring force in a direction opposite to the compression direction by being compressed.
The free height (length in the axial direction) of the elastic member 4 is larger than the length in the axial direction L of the elastic fixing portion 16 as shown in FIG. 2, and the base of the elastic fixing portion 16 in the axial direction L is further increased. It is larger than the length from the end to the tip of the pen tip 7.

  The operation unit 20 is a part operated by the user, and includes a pressing unit 25 and a covering unit 26 as shown in FIGS. 5, 6, and 7.

The pressing unit 25 is a part that is pressed by a finger or the like when the user performs a switching operation.
The pressing portion 25 has a tile shape and has a shape obtained by curving a plate-like body.
The thickness of the pressing part 25 is approximately the same as the thickness of the main body cylinder part 11 of the shaft cylinder 2. In other words, the thickness of the pressing portion 25 is substantially the same as the depth of the operation hole 13 of the main body cylinder portion 11.

As shown in FIG. 3, the covering portion 26 is a portion that covers a part of the outer peripheral surface of the core member 3, and has a shape in which a plate-like body thinner than the pressing portion 25 is curved.
As shown in FIGS. 6 and 7, the covering portion 26 includes a main body portion 29, an operation side engaging portion 30, and slide engaging portions 31 and 32.

  The main body 29 is an arc-shaped portion whose central axis extends in the front-rear direction, and has a shape along the outer peripheral surface of the ink containing portion 15 of the core member 3.

The operation side engagement portion 30 is a portion that can be engaged with the operation engagement portion 70 of the connection portion 22 shown in FIG. 5, and is a locking piece that protrudes from the main body portion 29 in the circumferential direction.
The operation side engaging portion 30 has a substantially trapezoidal shape when viewed from the side, and one side thereof is connected to the main body portion 29 and the inclined surface is formed forward.
That is, the operation side engagement part 30 has the front wall part 33 which forms the end surface of the front side of the axial direction L, and the rear wall part 34 which forms the end surface of the rear side like the enlarged view of FIG. Yes.

The front wall portion 33 is a wall surface erected in the circumferential direction from the rear end portion of the main body portion 29. Specifically, the front wall portion 33 is a wall portion that stands upright from the main body portion 29.
The front wall portion 33 is flush with the front end surface of the main body portion 29 in the circumferential direction.

The rear wall portion 34 is a wall surface that is erected from the main body portion 29 and forms a side opposite to the front wall portion 33. The rear wall 34 has an inclined surface 35 (first inclined surface) inclined at a predetermined angle from the main body 29 at least partially. In the present embodiment, the entire rear wall 34 is an inclined surface 35.
That is, the distal end surface of the operation side engaging portion 30 in the protruding direction has a length in the axial direction L that is smaller than the proximal end surface.

The inclined surface 35 is inclined with respect to the main body portion 29. That is, the surface direction of the inclined surface 35 can be decomposed into an axial direction component and a circumferential direction component perpendicular to the axial direction.
The inclination angle θ1 from the main body 29 of the inclined surface 35 is preferably 30 degrees or more and 60 degrees or less.

As shown in FIG. 6, the sliding engagement portions 31 and 32 are locking pieces that protrude from both end portions in the circumferential direction of the main body portion 29, and are rectangular portions in side view.
The long sides of the slide engaging portions 31 and 32 are connected to the main body portion 29 and are located from the rear end portion of the main body portion 29 to the intermediate portion.

From another viewpoint, the covering portion 26 has notches 27 and 28. The notches 27 and 28 are notches in which both end portions in the circumferential direction of the covering portion 26 are notched.
One notch portion 27 is a notch that is notched from the intermediate portion to the vicinity of the front end portion, and has a trapezoidal shape in side view.
The other cutout portion 28 is a cutout cut out from an intermediate portion to a front end portion, and has a rectangular shape in a side view.

Here, the positional relationship of each part of the operation unit 20 will be described. The vicinity of the rear end of the pressing unit 25 and the vicinity of the front end of the main body 29 overlap in the thickness direction (radial direction).
That is, a part of the main body 29 is located inside the pressing part 25, and the operation side engaging part 30 is located in the overlapping region.
The overlapping width of the pressing portion 25 and the main body portion 29 is longer than the length of the operation side engaging portion 30 in the axial direction L. The overlapping width of the pressing portion 25 and the main body portion 29 is preferably 1/6 to 1/3 of the length of the pressing portion 25 in the axial direction L.
The operation side engaging portion 30 is erected in a direction away from the pressing portion 25.

As shown in FIG. 8, the fixing portion 21 is a cylindrical portion, and the core member 3 can be inserted through the fixing portion 21.
As shown in FIGS. 8 and 9, the fixing portion 21 has a front side cylinder part 40 and a rear side cylinder part 41 having a diameter larger than that of the front side cylinder part 40.
The front side cylinder part 40 is a cylindrical part, and is a part where the fixing connection part 14 (see FIG. 4) of the shaft cylinder 2 can be externally fitted to the outer peripheral surface thereof. That is, the fixing portion 21 can be integrated with the shaft tube 2 by inserting the front side cylinder portion 40 into the fixing connection portion 14.

  The rear side cylinder part 41 is a part connected to the rear end part of the front side cylinder part 40, and as shown in FIG. 8, a notch part 43, a fixed side engagement part 45, And has a recess 46.

The notch 43 is a notch that is notched forward from the rear end of the rear cylinder portion 41.
The notch 43 cuts out about 2/5 of the entire circumference in the circumferential direction of the rear side cylinder part 41, and also in the axial direction L, from the rear end part of the rear side cylinder part 41 to the rear side cylinder part 41. Notch about 1/3 of the total length.
The cut-out portion 43 is a substantially rectangular cut-out when viewed from the side, and the protruding portion 61 (see FIG. 5) of the connection portion 22 can enter the cut-out.

The fixed side engaging portion 45 is an engaging piece that can be engaged with the fixing engaging portion 68 (see FIG. 5) of the connecting portion 22.
As shown in FIG. 9, the fixed side engaging portion 45 is formed in the rear end portion of the rear side cylinder portion 41 inside the notch portion 43.
The fixed-side engagement portion 45 is a locking piece that protrudes in the circumferential direction from the peripheral edge portion 44 that forms one edge in the circumferential direction of the cutout portion 43 toward the center of the cutout portion 43.
Specifically, the fixed-side engaging portion 45 has a substantially trapezoidal shape when viewed from the side as shown in the enlarged view of FIG. 9, one side of which is connected to the peripheral portion 44, and the inclined surface is formed rearward. Has been.
That is, the fixed-side engaging portion 45 has a front wall portion 47 that forms a front edge in the axial direction and a rear wall portion 48 that forms a rear edge.

The front wall portion 47 is a wall surface erected in the circumferential direction from the peripheral edge portion 44. Specifically, the front wall portion 47 is a wall portion vertically upright from the peripheral edge portion 44.
The rear wall portion 48 is a wall surface erected from the peripheral edge portion 44. The rear wall 48 has an inclined surface 50 (second inclined surface) inclined at a predetermined angle from the peripheral edge 44 at least partially. In the present embodiment, the entire rear wall 48 is an inclined surface 50.
That is, the distal end surface in the protruding direction of the fixed engagement portion 45 has a length in the axial direction L that is smaller than the base end surface.

The inclined surface 50 is inclined obliquely with respect to the peripheral edge portion 44. That is, the surface direction of the inclined surface 50 can be decomposed into an axial component and a circumferential component perpendicular to the axial direction.
The inclination angle θ2 from the peripheral portion 44 of the inclined surface 50 is preferably 30 degrees or more and 60 degrees or less.

As shown in FIG. 8, the recessed portion 46 is a portion that is recessed with respect to the other portion of the rear side cylinder portion 41, and a portion that regulates the moving direction of the operation portion 20 by fitting the pressing portion 25 of the operation portion 20. It is.
The concave portion 46 has a shape along the inner peripheral surface of the pressing portion 25 and extends in the axial direction L as shown in FIG. That is, the recess 46 can restrict the movement of the pressing portion 25 only in the axial direction L.

  As shown in FIG. 5, the connecting portion 22 includes a holding portion 60 and a protruding portion 61 that protrudes from the holding portion 60 in the axial direction.

The holding part 60 is a substantially semi-cylindrical part, into which the core member 3 can be inserted.
As shown in FIG. 5, the holding part 60 has a side surface forming part 62 that covers the side surface of the core member 3 and a rear surface forming part 63 that covers the rear end part of the core member 3.
The side surface forming portion 62 is formed of a front side surface portion 56 (connection side engaging portion), an intermediate side surface portion 57, and a rear side surface portion 58 in order from the front side in the axial direction L as shown in FIG. .
As shown in FIG. 5, the front side surface portion 56, the intermediate side surface portion 57, and the rear side surface portion 58 all have a substantially semicircular arc shape, and the internal space communicates in the axial direction.
The length of the arc of the intermediate side surface portion 57 sandwiched between the front side surface portion 56 and the rear side surface portion 58 (the length of the outer peripheral surface in the circumferential direction) is the front side surface portion 56 and the rear side surface located in front and rear thereof. The length of the arc of the portion 58 is short. That is, the peripheral end surface of the intermediate side surface portion 57 is recessed as compared with the peripheral end surfaces of the front side surface portion 56 and the rear side surface portion 58.
That is, on the front side of the intermediate side surface portion 57, the peripheral end surface (circumferential end surface) of the intermediate side surface portion 57 is stepped with the peripheral end surface of the front side surface portion 56 via the rear end surface of the front side surface portion 56. It is continuous. On the rear side of the intermediate side surface portion 57, the peripheral end surface of the intermediate side surface portion 57 is continuous with the peripheral end surface of the rear side surface portion 58 via the front end surface of the rear side surface portion 58.

From another point of view, the side surface forming portion 62 has notches 65 and 66 formed at portions corresponding to the intermediate side surface portion 57.
The notch portions 65 and 66 are intermediate portions in the axial direction of the side surface forming portion 62 and are portions where the peripheral end surface is notched. The notches 65 and 66 are rectangular notches, and their long sides extend in the axial direction.
The axial lengths of the notches 65 and 66 are larger than the axial lengths of the slide engaging portions 31 and 32 of the operation unit 20.

  The rear surface forming portion 63 is a disk-shaped portion, and stands upright in the radial direction from the rear end portion of the rear side surface portion 58.

The overhang portion 61 is a portion that is continuous with a part of the front end portion of the front side surface portion 56 and overhangs forward, and is a locking piece that extends in the axial direction.
As illustrated in FIG. 10, the overhang portion 61 includes an overhang main body 67, a fixing engagement portion 68, and an operation engagement portion 70.
The overhanging body 67 is a substantially long plate-like portion extending in the axial direction L from the front end portion of the front side surface portion 56, and the inner peripheral surface and outer peripheral surface thereof are the inner peripheral surface and outer periphery of the front side surface portion 56. Each surface is flush with each other.

The fixing engaging portion 68 is a locking piece protruding in the circumferential direction from the front end portion of the overhanging main body 67.
The fixing engaging portion 68 is a substantially trapezoidal portion, and a slope is formed forward.
That is, as shown in the enlarged view of FIG. 10, the fixing engagement portion 68 includes a front wall portion 71 that forms a front end surface in the axial direction L, and a rear wall portion 72 that forms a rear end surface. Yes.

The front wall portion 71 is a wall surface erected from the overhanging main body 67. The front wall 71 has an inclined surface 75 (second inclined surface) inclined at a predetermined angle from the overhanging body 67 at least partially. In the present embodiment, the entire front wall 71 is an inclined surface 75.
That is, the distal end surface in the protruding direction of the fixing engagement portion 68 has a smaller length in the axial direction L than the proximal end surface.

The inclined surface 75 is inclined obliquely with respect to the longitudinal direction of the overhanging main body 67. That is, the surface direction of the inclined surface 75 can be decomposed into an axial direction component and a circumferential direction component perpendicular to the axial direction.
It is preferable that the inclination angle θ3 of the inclined surface 75 with respect to the overhanging body 67 shown in FIG.
The inclination angle θ3 of the inclined surface 75 of the fixing engaging portion 68 is preferably substantially the same as the inclination angle θ2 (see FIG. 9) of the inclined surface 50 of the fixed-side engaging portion 45.
Here, “substantially the same level” means being in the range of plus or minus 2 degrees.

The rear wall portion 72 is a wall surface erected in the circumferential direction from the overhanging main body 67 and forms a side opposite to the front wall portion 71.
Specifically, the rear wall portion 72 is a wall portion that stands upright from the overhanging main body 67.

As shown in FIG. 10, the operation engaging portion 70 is a substantially trapezoidal portion, and protrudes in the circumferential direction from the peripheral end surface on the rear side of the overhanging main body 67.
As shown in the enlarged view of FIG. 10, the operation engaging portion 70 includes a front wall portion 81 that is an end surface on the front side, and a peripheral wall portion 82 that is continuous with the peripheral end portion of the front side surface portion 56.
The front wall portion 81 has an inclined surface 83 (first inclined surface) that is partially or entirely inclined.
The inclined surface 83 is inclined obliquely with respect to the overhanging main body 67 and the peripheral wall portion 82. That is, the surface direction of the inclined surface 83 can be decomposed into an axial component and a circumferential component.
The inclination angle θ4 of the inclined surface 83 with respect to the overhanging body 67 is preferably 20 degrees or more and less than 60 degrees.
The inclination angle θ4 of the inclined surface 83 of the operation engaging portion 70 is different from the inclination angle θ1 (see FIG. 7) of the inclined surface 35 of the operation side engaging portion 30. Specifically, the inclination angle θ4 is smaller than the inclination angle θ1.

  Then, the positional relationship of each member of the retractable writing instrument 1 in the housed state will be described.

As shown in FIG. 3B, the elastic member 4 has an elastic fixing portion 16 of the ink containing portion 15 inserted therein. That is, the rear end portion of the elastic member 4 is wound around the pen tip 7 and the elastic fixing portion 16, and the elastic member 4 is in a natural state or slightly contracted.
The elastic member 4 is located inside the front end forming portion 10, and the front end thereof is in contact with the front end forming portion 10.
The operation unit 20, the fixing unit 21, and the connection unit 22 are assembled so as to cover the outer peripheral surface of the core member 3.
The rear surface forming portion 63 of the connecting portion 22 is covered behind the ink containing portion 15 of the core member 3, and the side surface forming portion 62 covers most of the longitudinal direction of the ink containing portion 15.
In the side surface forming part 62, the covering part 26 of the operation part 20 is located at a position facing the radial direction across the core member 3. That is, the side surface forming portion 62 and the covering portion 26 are continuous in the circumferential direction around the core member 3.
The pressing part 25 of the operation part 20 is fitted in the concave part 46 of the fixing part 21.

As shown in FIG. 11A, the slide engaging portions 31 and 32 are positioned inside the notches 65 and 66, and the front end surfaces of the slide engaging portions 31 and 32 are front side surface portions. 56 (connection side engagement portion) is in contact with the rear end surface, and the operation portion 20 and the connection portion 22 are engaged with each other.
The fixing engaging portion 68 and the fixing side engaging portion 45 are arranged at positions separated in the axial direction as shown in FIG. The inclined surface 83 of the operation engagement portion 70 and the inclined surface 35 of the operation side engagement portion 30 face each other with a predetermined interval.

  Next, the change operation and the positional relationship when the user operates the operation unit 20 to change from the stored state to the writable state will be described.

  The user presses the pressing portion 25 of the operation unit 20 and slides the operation unit 20 toward the front side.

At this time, first, the front end surfaces of the slide engaging portions 31 and 32 abut against the rear end surface of the front side surface portion 56 and engage with each other, as shown in FIG. The connection part 22 moves together and moves forward. Further, since the pressing portion 25 of the operation unit 20 is fitted in the concave portion 46 of the fixed portion 21, the movement of the operation unit 20 is restricted in the axial direction.
Thereafter, the inclined surface 50 of the fixed side engaging portion 45 of the fixing portion 21 and the inclined surface 75 of the fixing engaging portion 68 of the connecting portion 22 come into contact with each other.
Further, as shown in FIG. 11B, a part of the inclined surface 50 of the fixed side engaging portion 45 and the inclined surface 75 of the fixing engaging portion 68 are brought into contact with each other and moved while coming into contact with each other. At this time, a part of the pressing force transmitted to the operation unit 20 is transmitted to the connecting portion 22, and the protruding main body 67 of the connecting portion 22 is elastically deformed in a direction away from the fixed portion 21 by the transmitted pressing force. The fixing engaging portion 68 gets over the fixing side engaging portion 45. Then, as shown in FIG. 11C, the front wall portion 47 of the fixed side engaging portion 45 and the rear wall portion 72 of the fixing engaging portion 68 are engaged, and the fixed side engaging portion 45 and the fixing engagement portion are engaged. The joining part 68 will be in an engagement state.

Further, the core member 3 is pushed forward against the elastic restoring force of the elastic member 4 by being pressed against the front surface of the rear surface forming portion 63, and the pen tip 7 of the core member 3 protrudes from the shaft tube 2 to be in a writable state. .
At this time, the elastic member 4 is in a compressed state.

  Then, the case where it switches from a writable state to an accommodation state is demonstrated.

  The user presses the pressing portion 25 of the operation unit 20 backward, and slides the operation unit 20.

At this time, as shown in FIG. 12A, the fixing portion 21 and the connecting portion 22 are engaged with the fixing side engaging portion 45 and the fixing engaging portion 68, so that the operating portion 20 is connected to the connecting portion 22. On the other hand, it moves relatively backwards.
After that, as shown in FIG. 12B, when the inclined surface 35 of the operating side engaging portion 30 of the operating portion 20 contacts the inclined surface 83 of the operating engaging portion 70 of the connecting portion 22, the operating side engaging portion 30. Since the inclination angle of the inclined surface 35 and the inclined surface 83 of the operation engaging portion 70 is different, a gap is formed between the inclined surface 35 of the operation side engaging portion 30 and the inclined surface 83 of the operation engaging portion 70. ing. Therefore, the inclined surface 83 of the operation engaging portion 70 is pressed by the inclined surface 35 of the operation side engaging portion 30, and the protruding body 67 of the connecting portion 22 is elastically deformed and fixed as shown in FIG. The engagement relationship between the fixed-side engaging portion 45 of the portion 21 and the fixing engaging portion 68 of the connecting portion 22 is released.
Further, when the operation unit 20 moves rearward, the connection unit 22 moves rearward through the core member 3 by the restoring force of the elastic member 4 as shown in FIG. While the rear end surface of the portion 56 comes into contact with the front end surfaces of the slide engaging portions 31 and 32 again, the operation portion 20 and the connection portion 22 are integrally moved in a direction away from the fixed portion 21 (rearward). .

  At this time, since the connecting portion 22 moves rearward in the axial direction, the core member 3 moves rearward due to the elastic restoring force of the elastic member 4, and the pen tip 7 of the core member 3 moves inside the shaft cylinder 2. The storage state is stored.

  According to the retractable writing instrument 1 of the present embodiment, the state can be switched between the writable state and the retracted state simply by pressing the pressing portion 25 of the operation unit 20. It is possible to change the state without changing the expression writing instrument 1.

  In the retractable writing instrument 1 of the present embodiment, the outer peripheral surface of the pressing portion 25 of the operation unit 20 and the outer peripheral surface of the main body cylindrical portion 11 of the shaft tube 2 are substantially flush. Therefore, when the user writes, even if the main body cylinder part 11 of the shaft cylinder 2 is gripped, the pressing part 25 is unlikely to get in the way.

  In the retractable writing instrument 1 of the present embodiment, the state can be switched between the writable state and the stored state using the engagement relationship in the axial direction. Therefore, even when the user writes, even if the shaft cylinder 11 is gripped, the engagement is difficult to be released. Therefore, it is possible to prevent the writing state from being suddenly switched to the storing state during writing.

  In the retractable writing instrument 1 of the present embodiment, the state can be switched between the writable state and the stored state by the engagement relationship around the core member 3, so that the ink storage portion 15 of the core member 3 can be changed. The capacity can be increased.

  In the above-described embodiment, the operation side engagement portion 30 of the operation portion 20 and the operation engagement portion 70 of the connection portion 22 both have inclined surfaces, but the present invention is not limited to this. The configuration may be such that only one of the operation side engaging portion 30 and the operation engaging portion 70 has an inclined surface.

  In the above-described embodiment, the operation part 20, the fixing part 21, and the connection part 22 are engaged in the circumferential direction on the outer periphery of the core member 3, but the present invention is not limited to this, and the diameter It may be configured to connect in a direction.

  In the above-described embodiment, the overhanging main body 67 of the connecting portion 22 is elastically deformed in conjunction with the pressing operation to the pressing portion 25, thereby fixing the fixing side engaging portion 45 of the fixing portion 21 and the connecting portion 22. Although the engagement state of the engagement portion 68 is released, the present invention is not limited to this, and the engagement portion is released by moving relative to the fixed portion 21. Also good.

  In the above-described embodiment, the end surface forming portion 9 and the main body cylinder portion 11 are integrally formed. However, the present invention is not limited to this, and the end surface forming portion 9 is easy to process. And the main body cylinder portion 11 may be formed separately and engaged with each other. That is, the end surface forming portion 9 may function as a tail plug.

DESCRIPTION OF SYMBOLS 1 Retractable writing instrument 2 Shaft cylinder 3 Core member 7 Pen tip (writing part)
DESCRIPTION OF SYMBOLS 20 Operation part 21 Fixed part 22 Connection part 30 Operation side engaging part 31, 32 Engaging part for slide 35 Inclined surface (1st inclined surface)
45 Fixed engagement portion 50 Inclined surface (second inclined surface)
56 Front side surface portion (connection side engagement portion)
65, 66 Notch (connection side engagement part)
68 engaging portion for fixing 70 engaging portion for operation 75 inclined surface (second inclined surface)
83 Inclined surface (first inclined surface)

Claims (8)

A telescoping type having a shaft cylinder gripped by the user, an operation unit operated by the user, a fixing unit integrated with the shaft cylinder, and a connection unit connected to the writing unit directly or via another member A writing instrument,
By operating the operation unit, it is possible to switch between a writing state in which a part of the writing unit protrudes from the shaft tube and a storage state in which the entire writing unit is stored inside the shaft tube. In the formula writing instrument,
The operation part has an operation side engagement part,
The fixed part has a fixed side engaging part,
The connection portion has an operation engagement portion engageable with the operation side engagement portion, and a fixing engagement portion engageable with the fixed side engagement portion,
At least one of the operation side engagement portion or the operation engagement portion has a first inclined surface inclined with respect to the axial direction,
In the writable state, the fixing engaging portion of the connecting portion is engaged with the fixing side engaging portion of the fixing portion,
When switching from the writable state to the retracted state, the operation portion is moved along the first inclined surface with respect to the operation engagement portion by moving the operation portion in the axial direction of the shaft tube. Are relatively moving,
Furthermore, the connecting portion moves and / or elastically deforms as the operating side engaging portion and the operating engaging portion move, and the fixing engaging portion of the connecting portion is fixed to the fixing side of the fixing portion. A retractable writing instrument, wherein the engagement state between the fixing engaging portion and the fixing side engaging portion is released by moving in a direction away from the joint portion.   2. The retractable writing instrument according to claim 1, wherein the operation engaging portion and the fixing engagement portion are arranged at a predetermined interval in an axial direction of the shaft cylinder. The operation portion has a slide engagement portion at a position away from the operation side engagement portion in the axial direction of the shaft cylinder,
The connection portion has a connection-side engagement portion that can be engaged with the slide engagement portion in the storage state;
When switching from the retracted state to the writable state, the operating portion is moved in the axial direction of the shaft cylinder, so that the operating engagement portion engages with the connection side engaging portion and the connection portion engages. Move together with the
The retractable writing instrument according to claim 1 or 2, wherein the fixed side engaging portion and the fixing engaging portion are engaged with each other with the movement of the connecting portion and the sliding engaging portion. At least one of the fixed side engaging portion and the fixing engaging portion has a second inclined surface inclined with respect to the axial direction,
When switching from the stored state to the writable state, the fixing portion is moved along the second inclined surface with respect to the fixed side engaging portion by moving the operation portion in the axial direction of the shaft cylinder. Part of the connecting part is elastically deformed such that the fixing engaging part is separated from the fixed side engaging part, and further, due to the restoring force of the connecting part accompanying the elastic deformation, The retractable writing instrument according to any one of claims 1 to 3, wherein the fixing engaging portion and the fixing side engaging portion are in an engaged state. The operation side engagement portion and the operation engagement portion each have a first inclined surface that is inclined with respect to the axial direction of the shaft tube,
When switching from the writable state to the retracted state, the first inclined surface of the operating side engaging portion and the first inclined surface of the operating engaging portion are brought into contact with each other, and the axial pressing force applied to the operating portion is reduced. The portion is transmitted to the connecting portion, and a part of the connecting portion is elastically deformed by the transmitted pressing force so that the fixing engaging portion is separated from the fixed-side engaging portion. Item 5. An intrusive writing instrument according to any one of Items 1 to 4.   When switching from the writable state to the retracted state, the first inclined surface of the operating side engaging portion and the first inclined surface of the operating engaging portion are abutted, and the first inclined surface of the operating side engaging portion is The retractable writing instrument according to claim 5, wherein a gap is formed between the first inclined surface of the operation engaging portion.   The angle of the 1st inclined surface of the said operation side engaging part with respect to an axial direction differs from the angle of the 1st inclined surface of the said engaging part for operation with respect to an axial direction, The Claim 5 or 6 characterized by the above-mentioned. Invitation writing instrument. Having a core member with the writing part;
The core member is rod-shaped, and an end thereof is connected to the connection portion,
The said operation part and a connection part are formed along the outer peripheral surface of the said core member, The retractable writing instrument in any one of Claims 1-7 characterized by the above-mentioned.

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