Writing instrument

Abstract

To provide a writing utensil which has a simple structure and can repeat the projection and retraction of a writing part.SOLUTION: The writing utensil is provided with a barrel 2, a writing member 3 having a writing part 31 at the front in the axial direction, a connecting part 4, and an operating part 5, the barrel 2 has a slit 27, and the connecting part 4 has a coupling part 42 inserted into the slit 27. The connecting part 42 has a rotation center part 43, the operating part 5 is disposed on the outer surface of the barrel 2, one end of the operating part 5 is rotatably connected to the rotation center part 43, and the other end of the operating part 5 is locked to a locking part provided on the barrel 2, so that the writing part 31 is in a retracted state, and the other end of the operating part 5 is rotated in one direction to release the locking, so that the writing part 31 can protrude.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a writing instrument, and more particularly to a writing instrument with a retractable pen tip. [Background technology]

[0002] Patent Document 1 discloses a writing implement having a barrel with an open end, a cartridge disposed inside the barrel and having a pen tip, an arm attached to the barrel so as to be able to pivot freely, a cap attached to the arm and closing the open end of the barrel, and a gear disposed inside the barrel and connected to the arm. In the writing implement described above, the gear is linked to the opening and closing operation (rotating operation) of the cap, and the gear is linked to the forward and backward movement of the cartridge, so that the pen tip can be freely retracted and protruded.

[0003] Patent Document 2 discloses a writing aid that includes a writing implement holder that grips the barrel and a finger holder that can freely hold a person's fingers, in order to reduce fatigue caused by writing for long periods of time and to assist people with weak writing pressure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5497649 [Patent Document 2] Utility Model Registration No. 3147361 Summary of the Invention [Problem to be solved by the invention]

[0005] The technology disclosed in Patent Document 1 has a structure in which a gear is arranged inside the barrel, which results in a large number of parts and a complex internal structure of the barrel. Furthermore, because the gear must be rotated to extend the pen tip, it is difficult to extend the pen tip quickly. It is also difficult to extend the pen tip with one hand.

[0006] The technology disclosed in Patent Document 2 is difficult to manufacture, and since the parts are separate from the barrel, there is a risk of the parts being lost.

[0007] The present invention aims to solve the above-mentioned problems of the prior art by providing a writing instrument that has a simple structure yet allows the writing part to be repeatedly extended and retracted. It also aims to provide a writing instrument that allows the pen tip to be extended quickly and can be operated with one hand. It also aims to provide a writing instrument that is free from the risk of losing parts, reduces fatigue caused by long periods of writing, and assists people with weak writing pressure. [Means for solving the problem]

[0008] The first invention of the present application comprises a cylindrical barrel having an opening that opens to the front, a writing member that can move axially inside the barrel and has a writing portion at the axial front, a connecting portion, and an operating portion, wherein the barrel has a slit that penetrates radially inward and outward, the connecting portion holds the writing member and is arranged in a state where it can move back and forth inside the barrel, the connecting portion protrudes radially outward and has a connecting portion that is inserted into the slit, the connecting portion has a rotation center, the operating portion is arranged on the outer surface of the barrel, one end of the operating portion is connected to the rotation center so as to be rotatable around a rotation axis that is perpendicular to the axis, and the other end of the operating portion is engaged with an engaging portion provided on the barrel, thereby placing the writing portion in a retracted state, and the writing portion can be protruded by rotating the other end of the operating portion in one direction to release the engagement.

[0009] The writing implement of the first invention has a simple structure that allows the writing part to be repeatedly extended and retracted, and the retracted state can be easily maintained.

[0010] The second invention of the present application is a writing instrument according to the first invention, wherein the rear end of the barrel has an inclined surface that approaches the axis as it moves axially rearward, and when transitioning from the protruding state to the retracted state, the other end of the operating part slides up the inclined surface, rotates in the other direction, and then retracts, so that the other end of the operating part engages with the engaging part.

[0011] In the writing implement of the second invention, the other end of the operating part can be easily locked to the rear end of the barrel by utilizing the inclined surface of the barrel.

[0012] The third invention of the present application is a writing instrument according to the second invention, wherein an elastic member is disposed inside the barrel and axially rearward of the writing member to bias the writing member forward in the axial direction, and when the writing member is in a sunk state, the writing member protrudes from the opening by releasing the lock of the operating unit.

[0013] The writing implement of the third invention can quickly protrude the writing part by utilizing the resilience of the elastic member, and can also protrude the writing part with one hand.

[0014] The fourth invention of the present application is a writing instrument according to any one of the first to third inventions, wherein the operating portion comprises an operating shaft and a finger support portion, one end of the operating shaft is rotatably connected to the rotation center, and the other end of the operating shaft is connected to the finger support portion, and in a protruding state, the finger support portion is positioned forward, and when the user is holding the writing instrument, the finger support portion is capable of supporting the user's finger.

[0015] The writing implement of the fourth invention has no risk of losing parts, and can reduce fatigue caused by writing for long periods of time and assist people with weak writing pressure.

[0016] The fifth invention of the present application comprises a cylindrical barrel having an opening that opens to the front, a writing instrument that is movable axially inside the barrel and has a writing part at the front of the axial direction, a connecting part, and an operating part, wherein the barrel has a slit that penetrates radially inward and outward, the connecting part holds the writing instrument and is arranged in a state where it can move back and forth inside the barrel, the connecting part protrudes radially outward and has a connecting part that is inserted into the slit, the connecting part has a rotation center, the operating part is arranged on the outer surface of the barrel, one end of the operating part is connected to the rotation center so as to be rotatable around a rotation axis that is perpendicular to the axis, and when the writing instrument is immersed inside the barrel, the other end of the operating part is located rearward, and when the writing part is protruding from inside the barrel, the other end of the operating part is located forward.

[0017] The writing implement of the fifth invention has a simple structure and allows the writing part to be repeatedly extended and retracted.

[0018] The sixth invention of the present application is a writing instrument according to the fifth invention, in which an elastic member that urges the writing member axially forward is arranged inside the barrel and axially rearward of the writing member.

[0019] The writing implement of the sixth invention can quickly protrude the writing part by utilizing the resilience of the elastic member, and can also protrude the writing part with one hand. [Effects of the Invention]

[0020] The present invention provides a writing instrument that has a simple structure yet allows the writing part to be repeatedly extended and retracted. It also provides a writing instrument that allows the pen tip to be extended quickly and with one hand. It also provides a writing instrument that is free from the risk of losing parts, reduces fatigue caused by long periods of writing, and assists people with weak writing pressure. [Brief explanation of the drawings]

[0021] [Figure 1] 1A and 1B are a front view and a front longitudinal cross-sectional view, respectively, of a writing implement in an immersed state according to a first embodiment of the present invention; [Figure 2] 1 is a perspective view of a writing implement in an immersion state according to a first embodiment of the present invention; [Figure 3] 1A and 1B are a front view and a front longitudinal cross-sectional view, respectively, of a writing implement in a protruding state according to a first embodiment of the present invention; [Figure 4] 1 is a perspective view of a writing implement in a protruding state according to a first embodiment of the present invention; [Figure 5] 1A is a side view, FIG. 1B is a front longitudinal sectional view, FIG. 1C is a plan view, and FIG. 1D is a perspective view of a barrel according to a first embodiment of the present invention. [Figure 6] 1A is a front view of a connection part according to a first embodiment of the present invention, FIG. 1B is a cross-sectional view taken along line AA, and FIG. 1C is a perspective view. [Figure 7] 1A is a front view, FIG. 1B is a front longitudinal sectional view, and FIG. 1C is a perspective view of an operating section according to a first embodiment of the present invention. [Figure 8] 1 is a front vertical cross-sectional view of a writing implement according to a first embodiment of the present invention, during transition from an immersion state to a writing state. [Figure 9] 1 is a front vertical cross-sectional view of a writing implement according to a first embodiment of the present invention, during transition from a writing state to an immersion state. [Figure 10] 1 is a diagram showing a state in which the writing instrument of the present invention is used. DETAILED DESCRIPTION OF THE INVENTION

[0022] The definitions of directions and the like used in this embodiment will be described below. In the writing instrument 1, the direction in which the axis (central axis or axial line) of the barrel 2 extends is referred to as the axial direction or axial direction, the direction perpendicular to the axial direction is referred to as the radial direction, and the direction along the circumference around the axis is referred to as the circumferential direction. The side from which the writing part 31 protrudes is referred to as the front or upper side, and the side opposite the writing part 31 is referred to as the rear or lower side. Accordingly, the direction parallel to the axial direction is sometimes referred to as the front-to-rear direction. When the writing part 31 of the writing member 3 is immersed inside the barrel 2, it is referred to as the immersed state or non-writing state, and when the writing part 31 protrudes from the barrel 2, it is referred to as the protruding state or writing state. Additionally, the perpendicular line perpendicular to the axis is referred to as the axis of rotation.

[0023] First Embodiment A first embodiment of the present invention is shown in Figures 1 to 10. A writing instrument 1 of this embodiment has a barrel 2, a writing member 3, a connecting portion 4, and an operating portion 5.

[0024] ·Shaft cylinder 2 The barrel 2 of this embodiment has a writing member 3 and a portion of the connecting portion 4 therein. Alternatively, the barrel 2 may have an elastic member 6 therein. The barrel 2 may be made of resin, particularly polycarbonate or polypropylene, from the viewpoint of cost efficiency, or wood or metal (e.g., stainless steel) from the viewpoint of appearance. The barrel 2 may be made of two or more cylindrical bodies from the viewpoint of ease of assembly. In this embodiment, the barrel 2 is made of two parts, a front barrel 21 and a rear barrel 22, from the viewpoint of ease of assembly. In this embodiment, the front barrel 21 and the rear barrel 22 are removably fixed by a surface fit. Alternatively, they may be removably fixed by a screw fit or a jump fit.

[0025] Front barrel 21 is generally cylindrical in shape, with opening 29 at the front, through which writing part 31 protrudes. Rear barrel 22 is generally cylindrical in shape with a bottom, with slit 27 penetrating radially inward and outward, and a barrel top surface at the rear that engages finger support part 52 of operating unit 5 (see FIG. 5). Rear barrel 22 may also have first elastic member support part 26 that supports elastic member 6 inside rear barrel 22. In this embodiment, first elastic member support part 26 is a cylinder with a column inside, and elastic member 6 is supported by the cylindrical inner surface and cylindrical outer surface while its radial movement is restricted.

[0026] The slit 27 is a hole that penetrates the rear axle 22 radially inward and outward. The slit 27 is located forward of the rear axle 22 and opens forward. The connecting portion 42, described below, is inserted into the slit 27 through its opening, facilitating assembly of the rear axle 22 and the connection portion 4. The rear end of the slit 27 is provided with an abutment surface that restricts rearward movement of the connecting portion 42. The circumferential width of the slit 27 is preferably at least slightly greater than the circumferential thickness of the connecting portion 42. This allows the connecting portion 42 and the connection portion 4 to slide in the fore-and-aft direction without rattle. It is sufficient for the rear axle 22 to have at least one slit 27. A configuration with one slit 27 facilitates the production of mold components for injection molding. Alternatively, the rear axle 22 may have two slits 27. A configuration with two slits 27 allows the connecting portion 42 and the connection portion 4 to slide in the fore-and-aft direction more smoothly.

[0027] The barrel top surface is a top surface that seals off the rear of rear barrel 22. The barrel top surface has inclined surface portion 23, horizontal surface portion 24, and first locking portion 25. Sloped surface portion 23 is a flat surface that approaches the axis as it moves axially rearward. In other words, inclined surface portion 23 is a flat surface that is inclined in the direction in which the operating part rotates. In this embodiment, in a plan view of rear barrel 22 (see Figure 5(C)), slit 27 and inclined surface portion 23 are located at the same position in the circumferential direction. Additionally, in a vertical cross section of writing instrument 1, the axis and inclined surface portion 23 intersect at an angle of approximately 40 degrees. This inclined surface portion 23 functions as a guide for operating part 5 when transitioning from the extended state to the retracted state. Horizontal surface portion 24 is a flat surface that is perpendicular to the axis. Horizontal surface portion 24 has first locking portion 25. First locking portion 25 is, for example, a convex portion that protrudes axially rearward. In the immersed state, the horizontal surface portion 24, particularly the first locking portion 25, restricts the finger support portion 52 from moving axially forward and from rotating in one direction about the rotation axis. The first locking portion 25 is preferably disposed in a position facing the inclined surface portion 23 with respect to the axis in a plan view. This effectively restricts the movement of the finger support portion 52. In this embodiment, the first locking portion 25 has one protrusion protruding axially rearward, but it may have multiple protrusions. This reliably restricts the movement of the finger support portion 52. In this embodiment, the first locking portion is provided on the barrel, but it may also be provided on the finger support portion.

[0028] The rear barrel 22 may have an operating shaft housing 28, which is a groove having a bottom recessed radially inward on the outer surface of the rear barrel 22. The operating shaft housing 28 is located at the same circumferential position as the slit 27 in a plan view of the barrel tube 2. The circumferential width of the operating shaft housing 28 is preferably formed slightly larger than the circumferential width of the operating shaft 51. Furthermore, the depth of the groove in the operating shaft housing 28 is preferably formed slightly larger than the radial width of the operating shaft 51. This allows the operating shaft 51 to be housed in the operating shaft housing 28 when the operating shaft 51 is located rearward of the connecting portion 42. In other words, when the writing instrument 1 is in a retracted state, the operating shaft 51 is housed in the operating shaft housing 28. This allows the writing instrument 1 in a retracted state to be transported without becoming bulky. In this embodiment, the front end face of the operating shaft housing 28 is located axially forward of the rear end face of the slit 27. When the connecting portion 42 and the operating shaft 51 are connected, the front end face of the operating shaft storage portion 28 abuts against one end of the operating shaft 51, restricting the operating portion 5 and the connecting portion 4 from moving forward and preventing the connecting portion 4 from falling off forward from the rear axle 22.

[0029] Writing material 3 The writing member 3 comprises a writing portion 31 and an ink reservoir 32. The writing portion 31 comes into contact with the paper surface and transfers ink to the paper surface. The writing portion 31 is a ballpoint pen tip or a fiber tip used in marking pens. The ink reservoir 32 contains the ink to be supplied to the writing portion 31. The ink reservoir 32 is preferably substantially cylindrical and made of synthetic resin or metal. Examples of inks contained in the ink reservoir 32 include water-based ink, oil-based ink, and reversible thermochromic ink.

[0030] Connection 4 The connecting part 4 comprises a substantially cylindrical main body 41 and a connecting part 42 that protrudes radially outward from the main body 41 (see FIG. 6). The inside of the main body 41 of the connecting part 4 holds the writing member 3. In this embodiment, the inner surface of the main body 41 has multiple inner ribs 46 that protrude radially inward. These inner ribs 46 secure the writing member 3 while aligning the writing member 3 and the barrel 2 coaxially. The main body 41 of the connecting part 4 may be a substantially cylindrical shape with a top surface at the rear and a bottom. This allows the inner top surface of the connecting part 4 to abut against the rear end surface of the writing member 3, reliably restricting rearward movement of the writing member 3.

[0031] From the viewpoint of cost, it is preferable to select a resin, particularly polycarbonate, polypropylene, polyacetal, or the like, as the material for the connection portion 4 of this embodiment.

[0032] The connecting portion 42 is a single plate-like protrusion that protrudes radially outward and has a thickness in the circumferential direction. The connecting portion 42 includes a rotation center portion 43, and the rotation center portion 43 and one end of the operating shaft 51 are rotatably connected about the rotation axis. The rotation center portion 43 and the operating shaft 51 can be rotatably connected, for example, by providing a cylindrical protrusion on one end and a hole on the other end, or by providing holes on both ends and inserting a cylindrical pin into the holes. In this embodiment, the rotation center portion is a single hole that penetrates circumferentially. The connecting portion 42 is inserted into the slit 27 of the rear axle 22 and slides in the front-to-rear direction. The connecting portion 42 may be configured to have two or more plate-like protrusions spaced a short distance apart in the circumferential direction. This allows the connecting portion 42 to be connected while more strongly restricting the circumferential movement of the operating portion 5. Alternatively, the connecting portion 42 may be configured to have two plate-like protrusions positioned opposite each other along the axis in a plan view. Furthermore, the coupling part 42 may have a notch into which one end of the operating shaft 51 is inserted. This allows the connecting part 4 to slide more smoothly in the front-rear direction.

[0033] The outer surface of the connection portion 4 may be provided with at least one outer rib 47, which is a rib that protrudes radially outward. In the cross section of the connection portion 4, the diameter of the circumscribing circle of the outer rib 47 is slightly smaller than the inscribing circle of the inner surface of the rear axle 22. This allows the connection portion 4 to slide smoothly without wobbling when sliding in the front-to-rear direction inside the barrel 2. In addition, a second elastic member support portion 44 for supporting the elastic member 6 may be provided on the outer surface of the top surface behind the connection portion 4. In this embodiment, the second elastic member support portion 44 is a substantially cylindrical protrusion. This allows the elastic member 6 to be held by the first elastic member support portion 26 and the second elastic member support portion 44 of the barrel 2, enabling more reliable and quick protrusion operation.

[0034] ·Operation unit 5 The operating unit 5 has an operating shaft 51 and a finger support portion 52 (see FIG. 7). From the viewpoint of cost, the operating unit 5 is preferably formed from resin. The operating unit 5 may be formed from the same material, may be formed by two-color molding using different materials, or may be formed by assembling separate parts.

[0035] The operating shaft 51 is, for example, a rectangular prism extending in the axial direction. Other shapes include a cylindrical shape and a polygonal prism. The material of the operating shaft 51 is preferably selected from, for example, polycarbonate, polypropylene, or polyacetal. One end of the operating shaft 51 is rotatably connected to the rotation center of the connecting portion 42, and the other end is connected to the finger support portion 52. The one end of the operating shaft 51 may have any shape that allows it to be rotatably connected to the connecting portion 42. In this embodiment, the one end of the operating shaft 51 has a notch that is approximately U-shaped in side view and a hole that penetrates in a direction perpendicular to the axis. The connecting portion 42 is inserted into the notch of the operating shaft 51, and the central axis of the rotation center portion 43 and the central axis of the through-hole are aligned on the same line. The operating shaft 51 and the rotation center portion 43 are rotatably connected to each other by a cylindrical pin. Alternatively, the operating shaft 51 may have multiple notches. This allows the connection to be made while more strongly restricting the circumferential movement of the operating part 5. In addition to the above-described configuration, one end of the operating shaft 51 may be inserted into a notch in the connecting part 42.

[0036] In the protruding state, the finger support portion 52 is positioned axially forward of the connecting portion 42, specifically, approximately in the middle of the front barrel 21. The finger support portion 52 may have any shape that makes it easy to grip the writing instrument 1. In this embodiment, the finger support portion 52 has a bottomed cylindrical shape with an open end connected to the operating shaft 51. The material for the finger support portion 52 is preferably selected from, for example, polypropylene, polyacetal, or elastomer. It is also possible to form the exterior of the finger support portion 52 from polypropylene and then insert an elastic material such as elastomer inside to gently protect the fingers. Alternatively, the finger support portion 52 may have a solid shape whose radial outer surface supports the fingers. The outer diameter of the finger support portion 52 is preferably approximately the same as the outer diameter of the barrel 2. This allows the writing instrument 1 to be carried compactly in the retracted state. Furthermore, in the retracted state, the outlines of the barrel 2 and the finger support portion 52 coincide, achieving a simple appearance. In this case, the outer diameter of the finger support portion 52 and the outer diameter of the barrel 2 are preferably set to φ12 mm to φ22 mm, and more preferably φ15 mm to φ20 mm. Similarly, the inner diameter of the finger support portion 52 is preferably φ10 mm to 20 mm, and more preferably φ13 mm to φ18 mm. In other words, it is preferable that the size be such that the user's index finger can be inserted inside the finger support portion. This is effective in further reducing fatigue during writing and assisting people with weak writing pressure.

[0037] Elastic member 6 The writing instrument 1 of this embodiment may have an elastic member 6 disposed inside the barrel 2 and axially rearward of the writing member 3, which urges the writing member 3 axially forward. In this embodiment, the elastic member 6 is a coil spring, supported by the first elastic member support portion 26 and the second elastic member support portion 44, and urges the connecting portion 4 and the writing member 3 forward. Additionally, in the immersed state, the elastic member 6 indirectly urges the finger support portion 52 forward. This more firmly maintains the engagement between the finger support portion 52 and the first engagement portion 25, eliminating the risk of the engagement being unintentionally released.

[0038] The process of transitioning from an immersive state to a protrusive state The process by which the writing part 31 transitions from a retracted state to a protruding state will be described. When the writing part 31 is retracted (see FIG. 1), the writing member 3 and the connecting part 4 are arranged at the rear inside the barrel 2. The operating shaft 51 is located rearward of the connecting part 42 and is arranged inside the operating shaft storage part 28. In other words, the operating shaft 51 is arranged in a state that is approximately parallel to the axial direction. The finger support part 52 is located rearward of the connecting part 42 and is engaged at the rear of the barrel 2 by the horizontal surface part 24 of the rear barrel 22 and the first engaging part 25. In detail, the inner surface of the opening of the finger support part 52 and the first engaging part 25 are engaged. If the configuration includes an elastic member 6, the elastic member 6 is arranged inside the barrel 2 in an axially compressed state.

[0039] First, a force is applied to rotate the finger support portion 52 in one direction (e.g., counterclockwise) around the rotation axis, thereby releasing the engagement between the finger support portion 52 and the first locking portion 25. In a configuration without the elastic member 6, a force is applied to rotate the finger support portion 52 in one direction and a force is applied to move it forward in the axial direction. In a configuration with the elastic member 6, the writing element 3 and the connection portion 4 automatically and quickly move forward due to the restoring force of the elastic member 6 as soon as the engagement between the finger support portion 52 and the first locking portion 25 is released. Figure 8 shows the state in the middle of transitioning from the retracted state to the extended state. The operating shaft 51 rotates around the rotation center 43, and the operating shaft 51 becomes approximately perpendicular to the axial direction. At this time, the finger support portion 52 is furthest away from the barrel 2. If the finger support portion 52 is further advanced and rotated from Figure 8, it will stop in the state shown in Figure 3. Specifically, the operating shaft 51 abuts against the front end surface of the operating shaft storage portion 28, ending its forward axial movement. Furthermore, rotation about the rotation axis is terminated when the outer surface of the operating shaft 51 abuts against the outer surface of the barrel 2. At this time, the operating shaft 51 and the finger support portion 52 are positioned forward of the connecting portion 42. The operating shaft 51 is again approximately parallel to the axial direction.

[0040] How to use writing implement 1 The user writes by pressing the writing instrument 1 against the paper surface and bringing the writing part 31 into contact with the paper surface. In the writing state of this embodiment, the finger support part 52 is positioned forward with the rear open. The user can insert their index finger into the opening of the finger support part 52 and hold the writing instrument 1 with the thumb, index finger, and middle finger (Figure 10). By using the finger support part 52, the position of the index finger is less likely to shift, making it possible to hold the writing instrument 1 firmly. In addition, the diameter of the writing instrument 1 is increased by the amount of the finger support part 52 compared to the outer surface of the writing instrument 1, making it easier to hold.

[0041] When the writing instrument 1 is used in the above-described state, a force is applied to the finger support portion 52 in the forward axial direction, allowing the writing portion 31 to be constantly maintained in a protruding state. Furthermore, if the elastic member 6 is disposed behind the writing element 3, when the writing element 31 is pressed against the paper surface, the elastic member 6 is compressed slightly by the repulsive force from the paper surface, allowing the writing element 3 to move slightly back and forth. This makes it easy to draw lines with varying thickness.

[0042] The writing instrument 1 may be provided with a second locking portion 45 on the inner circumferential front surface of the notch at one end of the operating shaft 51, and a third locking portion 53 on the front end surface of the connecting portion 42. In this way, in the protruding state, the second locking portion 45 and the third locking portion 53 are locked together, thereby preventing the operating shaft 51 and the finger support portion 52 from unintentionally rotating in the other direction (for example, clockwise). In this embodiment, the second locking portion 45 is a protrusion that protrudes forward from the inner circumferential front surface of the notch, and the third locking portion 53 is a protrusion that protrudes forward from the front end surface of the connecting portion 42, and the second locking portion 45 and the third locking portion 53 are locked together by a jump-over fit.

[0043] The process of transitioning from a protruding state to an immersed state The process by which the writing part 31 transitions from the protruding state to the retracted state will be described below. First, when the writing part 31 is in the retracted state (see FIG. 3), a force is applied to rotate the finger support part 52 in the other direction (for example, clockwise) relative to the rotation axis, and a force is applied to move it rearward in the axial direction, thereby moving the other end of the operating shaft 51 and the finger support part 52 rearward. If the elastic member 6 is configured to be disposed inside the barrel 2, the finger support part 52 is moved axially rearward against the resilient force of the elastic member 6.

[0044] As the other end of the operating shaft 51 and the finger support portion 52 continue to move, the finger support portion comes into contact with the inclined surface, as shown in FIG. 9. From this state, by continuing to rotate the finger support portion 52, the finger support portion 52 moves, sliding up the inclined surface 23 of the rear axle 22. This facilitates the movement of the finger support portion 52 toward the rear of the barrel 2. More specifically, the user does not need to intentionally apply force axially rearward to the operating unit 5; simply by continuing to rotate the operating unit 5, the finger support portion 52 automatically moves rearward in the barrel 2, facilitating the immersion operation. By continuing to rotate the finger support portion even after it has reached the top of the inclined surface 23, the finger support portion 52 is locked at the rear of the barrel 2 by the horizontal surface 24 and the first locking portion 25 of the rear axle 22 (see FIG. 1).

[0045] The writing implement of this embodiment comprises a cylindrical barrel 2 having an opening that opens forward, a writing member 3 that is movable axially inside the barrel 2 and has a writing part 31 at the axial front, a connecting part 4, and an operating part 5, the barrel 2 having a slit 27 that penetrates radially inward and outward, the connecting part 4 holds the writing member 3 and is disposed inside the barrel 2 in a state that allows it to move back and forth in the longitudinal direction, the connecting part 4 protruding radially outward and inserted into the slit 27 The operating unit 5 has a connecting portion 42 through which the writing unit 31 is inserted, the connecting portion 42 having a rotation center portion 43, the operating unit 5 is disposed on the outer surface of the barrel 2, one end of the operating unit 5 is connected to the rotation center portion 43 so as to be rotatable around a rotation axis that is perpendicular to the axis, the other end of the operating unit 5 is engaged with an engaging portion provided on the barrel 2, thereby placing the writing unit 31 in a retracted state, and by rotating the other end of the operating unit 5 in one direction to release the engagement, the writing unit 31 can be extended. This allows the writing instrument 1 to have a simple structure that allows the writing unit 31 to repeatedly extend and retract. Furthermore, the retracted state can be easily maintained.

[0046] In the writing implement of the present invention, the rear end of the barrel 2 has an inclined surface that approaches the axis toward the rear in the axial direction, and when transitioning from the extended state to the retracted state, the other end of the operating part 5 slides up the inclined surface, rotates in the other direction, and then retracts, and the other end of the operating part 5 is locked with the locking part. As a result, by utilizing the inclined surface of the barrel 2, the other end of the operating part 5 can be easily locked with the rear end of the barrel 2.

[0047] In the writing instrument of this embodiment, an elastic member 6 that urges the writing member 3 axially forward is disposed inside the barrel 2 and axially rearward of the writing member 3. When the writing part 31 is in a retracted state, the writing part 31 protrudes from the opening by releasing the lock of the operating part 5. This allows the writing part 31 to be protruded quickly by utilizing the resilience of the elastic member 6. Furthermore, the writing part 31 can be protruded with one hand.

[0048] In the writing instrument of this embodiment, the operating unit 5 includes an operating shaft 51 and a finger support portion 52, one end of the operating shaft 51 is rotatably connected to the rotation center portion 43, and the other end of the operating shaft 51 is connected to the finger support portion 52, and in the protruding state, the finger support portion 52 is located forward and can support the user's fingers when the user is holding the writing instrument. This eliminates the risk of losing parts, and makes it possible to reduce fatigue caused by long periods of writing and to assist people with weak writing pressure.

[0049] The writing implement of this embodiment comprises a cylindrical barrel 2 having an opening 29 that opens forward, a writing member 3 that is movable axially inside the barrel 2 and has a writing part 31 at the axial front, a connecting part 4, and an operating part 5, the barrel 2 having a slit 27 that penetrates radially inward and outward, the connecting part 4 holds the writing member 3 and is disposed inside the barrel 2 in a state that allows it to move back and forth, the connecting part 4 protruding radially outward and inserted into the slit 27. The requirements are that the writing instrument 1 has a connecting part 42 through which the writing part 31 is passed, the connecting part 42 having a rotation center part 43, the operating part 5 is disposed on the outer surface of the barrel 2, one end of the operating part 5 is connected to the rotation center part 43 so as to be rotatable around a rotation axis that is a perpendicular line perpendicular to the axis, and when the writing instrument is retracted inside the barrel 2, the other end of the operating part 5 is located rearward, and when the writing part 31 is protruding from inside the barrel 2, the other end of the operating part 5 is located forward. This allows the writing instrument 1 to have a simple structure and repeatedly have the writing part 31 protrude and retract.

[0050] In the writing instrument of this embodiment, an elastic member 6 that urges the writing member 3 axially forward is disposed inside the barrel 2 and axially rearward of the writing member 3. This allows the writing part 31 to be quickly protruded by utilizing the resilience of the elastic member 6. Furthermore, the writing part 31 can be protruded with one hand. [Explanation of symbols]

[0051] 1 writing implements 2 shaft cylinder 21 Front axle 22 rear axle 23 Slope 24 Horizontal part 25 First locking portion 26 First elastic member support portion 27 Slit 28 Operating shaft storage section 29 Opening 3 Writing materials 31 Writing section 32 Ink reservoir 4 Connection 41 Main body 42 Connecting part 43 Rotation center 44 second elastic member support portion 45 Second locking portion 46 Inner rib 47 outer rib 5 Control section 51 Operation axis 52 Finger support part 53 Third locking portion 6 Elastic member

Claims

1. The writing implement comprises a cylindrical barrel having an opening at the front, a writing member that is movable in the axial direction inside the barrel and has a writing part at the axial front, a connecting part, and an operating part; The barrel has a slit penetrating radially inward and outward, the connecting portion holds the writing member and is arranged in a state in which it can move back and forth inside the barrel; The connection portion has a coupling portion that protrudes radially outward and is inserted into the slit, The connecting portion has a pivot center, The operating portion is disposed on an outer surface of the barrel, One end of the operation unit is connected to the rotation center so as to be rotatable about a rotation axis that is a perpendicular line orthogonal to the axis, The other end of the operating part is engaged with a locking part provided on the barrel, so that the writing part is in a immersed state. The writing implement is characterized in that the writing part can be protruded by rotating the other end of the operating part in one direction to release the lock.

2. The rear end of the barrel has an inclined surface that approaches the axis center as it extends axially rearward, When the protruding state is shifted to the retracted state, the other end of the operating part rotates to the other side while sliding up the inclined surface and retreats, 2. The writing implement according to claim 1, wherein the other end of the operating portion is locked to the locking portion.

3. The writing instrument described in claim 2, characterized in that an elastic member that urges the writing member axially forward is arranged inside the barrel and axially rearward of the writing member, and when the writing part is in a immersed state, the operating part is released from its engagement, causing the writing part to protrude from the opening.

4. the operation unit includes an operation shaft and a finger support portion, A writing instrument as described in any one of claims 1 to 3, characterized in that one end of the operating shaft is rotatably connected to the rotation center, and the other end of the operating shaft is connected to the finger support portion, and in the protruding state, the finger support portion is positioned forward, and when the user is holding the writing instrument, the finger support portion can support the user's finger.

5. The writing implement comprises a cylindrical barrel having an opening at the front, a writing member that is movable in the axial direction inside the barrel and has a writing part at the axial front, a connecting part, and an operating part; The barrel has a slit penetrating radially inward and outward, the connecting portion holds the writing member and is arranged in a state in which it can move back and forth inside the barrel; The connection portion has a coupling portion that protrudes radially outward and is inserted into the slit, The connecting portion has a pivot center, The operating portion is disposed on an outer surface of the barrel, One end of the operation unit is connected to the rotation center so as to be rotatable about a rotation axis that is a perpendicular line orthogonal to the axis, When the writing instrument is immersed in the barrel, the other end of the operating part is located rearward, When the writing part is protruding from the barrel, the other end of the operating part is located forward. A writing instrument characterized by:

6. 6. The writing implement according to claim 5, wherein an elastic member is disposed inside the barrel and axially rearward of the writing member, for urging the writing member axially forward.

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