Retractable grip writing instrument

Abstract

To provide a writing instrument having a grip made of an elastic material attached to a gripping portion at a front end of a barrel of the writing instrument that is to be gripped by a user when writing with the writing instrument.SOLUTION: Provided is a retractable grip writing instrument including an inner body that is disposed inside a barrel in a radial direction so as to be movable back and forth which is the axial direction, has a pen tip at its tip, and moves forward within the barrel in a writing state so that the pen tip protrudes from the tip of the barrel, and moves backward within the barrel in the retracted state so that the pen tip is retracted into the barrel. When the inner body moves forward to enter the writing state, an outer peripheral surface of a grip portion which is an outer surface of a grip made of an elastic material in the radial direction, is exposed from an outer peripheral surface of the barrel which is an outer surface of the barrel in the radial direction of the grip portion at a front end of the barrel. When the inner body moves backward to enter the retracted state, the outer peripheral surface of the grip portion is recessed inward in the radial direction relative to the outer peripheral surface of the barrel.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a writing instrument having a grip made of an elastic material attached to a gripping portion at the front end of the barrel of the writing instrument, which is to be held by a user when writing with the writing instrument. [Background technology]

[0002] BACKGROUND ART Writing implements have been known in the art that have a grip made of an elastic material attached to a gripping portion at the front end of a barrel of the writing implement that is held by a user when writing with the writing implement.

[0003] For example, Patent Document 1 proposes a rubber grip structure in which a grip is formed with bulging portions that bulge radially by contracting in the axial direction of the barrel of a writing instrument, and which stably forms multiple bulging portions and stably changes the amount of bulging of the bulging portions, making it possible to adjust the hardness.

[0004] Patent Document 2 proposes a knock-type writing implement that is said to have a good gripping feel and improved anti-slip effect.

[0005] Patent Document 3 proposes a barrel of a writing implement that provides a good gripping feel and prevents the grip from rotating. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-155368 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-99915 [Patent Document 3] Japanese Patent Application Laid-Open No. 2009-45881 Summary of the Invention [Problem to be solved by the invention]

[0007] When a grip made of an elastic material is attached to the grip portion at the front end of the barrel of the writing instrument, which is held by the user when writing with the writing instrument, the grip made of an elastic material is exposed on the outer surface of the barrel at the grip portion.

[0008] Grips made of elastic material are generally less smooth than the materials that make up the barrel. Therefore, when a writing instrument with a grip made of elastic material exposed on the outer surface of the barrel at the gripping portion is inserted into a pocket or notebook, it can sometimes be difficult to insert the grip, requiring time and effort or forcing. Furthermore, when carrying the writing instrument in a pen case, adjacent writing instruments can rub against each other, causing the grip to become dirty. This tendency is particularly prevalent when the grip made of elastic material is a soft rubber-like grip.

[0009] Therefore, the object of this invention is to provide a writing instrument that can be easily attached to a pocket, notebook, etc. by reducing the resistance caused by the grip made of an elastic material being exposed at the gripping portion when attached to a pocket, notebook, etc., and that can reduce the amount of dirt on the grip even if the grip exposed at the gripping portion rubs against an adjacent writing instrument when carried in a pen case, etc. [Means for solving the problem]

[0010] The present invention, which solves the above-mentioned problems, can be exemplified as follows. [1] The pen is provided with an inner body that is disposed inside the barrel in the axial direction so as to be movable back and forth in the axial direction, has a pen tip at its tip, and in a writing state, moves forward inside the barrel to cause the pen tip to protrude from the tip of the barrel, and in a stored state, moves backward inside the barrel to store the pen tip inside the barrel, When the inner body moves forward to enter the writing state, an outer peripheral surface of the grip portion, which is the outer surface of the grip made of an elastic material in the axial direction, is exposed from an outer peripheral surface of the barrel, which is the outer surface of the barrel in the axial direction of the grip portion at the front end side of the barrel that is held by a user in the writing state, When the intermediate body moves in the rearward direction and assumes the stored state, the outer peripheral surface of the grip portion is recessed inward in the shaft radial direction relative to the outer peripheral surface of the barrel. A retractable grip writing instrument.

[0011] [2] a grip portion peripheral wall, which is a peripheral wall of the barrel that constitutes the grip portion, is provided with a grip entry / exit opening that penetrates the grip portion peripheral wall in the axial radial direction, The grip is recessed into the grip retraction opening in the stored state, and has a grip protrusion that protrudes outward from the grip retraction opening in the axial direction in the writing state, exposing the outer surface of the grip portion. [1] A grip retraction type writing instrument.

[0012] [3] The grip has an annular grip portion peripheral wall disposed inside the holding portion peripheral wall in the axial radial direction, The grip protrusion protrudes outward in the axial direction from the outer peripheral surface of the grip portion peripheral wall, which is the outer surface of the grip portion peripheral wall in the axial direction. [2] A grip retractable writing instrument.

[0013] [4] a plurality of the grip openings are formed at predetermined intervals in the axial direction and at predetermined intervals in the circumferential direction of the grip portion, The grip portion is cylindrical and extends in the axial direction, and the grip protrusions are formed on the outer peripheral surface of the grip portion peripheral wall at positions corresponding to the positions where the grip openings are formed in the grip portion peripheral wall [3].

[0014] [5] The grip portion peripheral wall has a grip operation recess curved outward in the axial radial direction on an inner circumferential wall surface of the grip portion that is on the inside in the axial radial direction, The inner main body has a grip push-up protrusion that protrudes outward in the axial radial direction, The grip push-up convex portion fits into the grip actuation recess in the stored state, and in the writing state, the outer surface of the grip push-up convex portion, which is the outer surface of the grip push-up convex portion in the axial diameter direction, abuts against the inner wall surface of the grip portion that is forward or rearward in the axial direction from the position where the grip actuation recess is formed on the inner wall surface of the grip portion. [3] or [4] A grip retractable writing instrument.

[0015] [6] The inner peripheral wall surface of the grip portion, against which the outer surface of the grip push-up convex portion abuts in the writing state, forms a grip actuation convex portion that protrudes inward in the axial direction from the inner peripheral wall surface of the grip portion [5].

[0016] [7] A grip retractable writing instrument [6] in which a grip portion inclined surface is formed from the rear end and / or front end in the axial direction of the inner peripheral wall surface of the grip actuation convex portion, which is the inner surface in the axial radial direction of the grip actuation convex portion, and extends obliquely outward in the axial radial direction. [Effects of the Invention]

[0017] According to this invention, when the writing instrument is attached to a pocket, notebook, etc., the resistance caused by the grip made of elastic material being exposed at the gripping portion is reduced, making it easy to attach, and when the writing instrument is carried in a pen case, etc., the grip exposed at the gripping portion is rubbed against an adjacent writing instrument, reducing the likelihood of the grip becoming dirty. [Brief explanation of the drawings]

[0018] [Figure 1]1(a) is a cross-sectional view illustrating the positional relationship of the internal structure in a storage state in which the nib is stored in the barrel, and FIG. 1(b) is a cross-sectional view illustrating the positional relationship in the axial direction between the outer surface of the grip at the grip portion of the barrel and the outer surface of the barrel in the state shown in FIG. 1(a). [Figure 2] In the writing instrument shown in Figure 1, (a) is a cross-sectional view explaining the positional relationship of the internal structure in the writing state where the pen tip protrudes from the end of the barrel, and (b) is a cross-sectional view explaining the positional relationship in the axial direction between the outer surface of the grip at the gripping portion of the barrel and the outer surface of the barrel in the state shown in Figure 2(a). [Figure 3] 1(a) is a cross-sectional view with some parts omitted to illustrate the positional relationship between the grip actuation recess, grip actuation protrusion, and grip portion inclined surface extending obliquely from the axial rear end and / or front end of the grip actuation protrusion inner wall surface of the grip portion constituting the grip in the stored state of FIG. 1(a), and the grip push-up protrusion provided on the inner main body; (b) is a cross-sectional view with some parts omitted to illustrate the positional relationship between the grip actuation recess, grip actuation protrusion, and grip portion inclined surface and the grip push-up protrusion in the state in which the inner main body starts to move forward from the state shown in FIG. 1(a) to the state shown in FIG. 2(a); and (c) is a cross-sectional view with some parts omitted to illustrate the positional relationship between the grip actuation recess, grip actuation protrusion, and grip portion inclined surface and the grip push-up protrusion in the writing state of FIG. 2(a). [Figure 4] 2A, 2B, and 2C are diagrams illustrating an example of the rear end side of the main body where the clip on the main body of the writing instrument shown in FIG. 1 is disposed, where FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a cross-sectional view. [Figure 5] 5A and 5B are diagrams illustrating an example of a main body joint that connects the upper and lower main bodies that make up the barrel of the writing instrument shown in FIG. 1, where (a) is a front view, (b) is an enlarged view of a portion of FIG. 5A, (c) is a plan view, and (d) is a cross-sectional view. [Figure 6] 2A to 2C are diagrams illustrating an example of the lower part of the main body constituting the barrel of the writing implement shown in FIG. 1, where (a) is a perspective view, (b) is a plan view, and (c) is a cross-sectional view. [Figure 7] FIG. 2 is a perspective view illustrating an example of an inner main body in the writing instrument shown in FIG. [Figure 8] 8 is a front view illustrating an example of the structure of a sharpening mechanism formed by the inner main body shown in FIG. 7 and used in the writing implement shown in FIG. 1. [Figure 9] 2A to 2C are diagrams showing an example of a grip of the writing implement shown in FIG. 1, in which (a) is a perspective view, (b) is a front view, and (c) is a cross-sectional view. [Figure 10] 2(a) is a front view showing the appearance of the writing instrument shown in FIG. 1 in the stored state shown in FIG. 1(a), and FIG. 2(b) is a front view showing the appearance of the writing instrument shown in FIG. 1 in the writing state shown in FIG. 2(a). [Figure 11] 2(a) is a perspective view showing the appearance of the writing instrument shown in FIG. 1 in the stored state shown in FIG. 1(a), and FIG. 2(b) is a perspective view showing the appearance of the writing instrument shown in FIG. 1 in the writing state shown in FIG. 2(a). [Figure 12] 10A and 10B are diagrams showing an example of a retractable grip writing instrument according to another embodiment of the present invention, in which (a) is a cross-sectional view illustrating the positional relationship of the internal structure in a storage state in which the nib is stored within the barrel, and (b) is a cross-sectional view illustrating the positional relationship of the internal structure in a writing state in which the nib protrudes from the tip of the barrel. [Figure 13] (a) is a cross-sectional view with some parts omitted to explain the positional relationship between the grip actuation recess, the grip actuation protrusion, the grip portion inclined surface, and the grip push-up protrusion in the stored state of Figure 12(a); (b) is a cross-sectional view with some parts omitted to explain the positional relationship between the grip actuation recess, the grip actuation protrusion, the grip portion inclined surface, and the grip push-up protrusion in the writing state of Figure 12(a). [Figure 14] 1A and 1B are diagrams illustrating the state in which a writing instrument according to one embodiment of the present invention is attached to a pocket, where (a) is a diagram illustrating the state in which it is about to be attached to the pocket, and (b) is a diagram illustrating the state in which it has been attached to the pocket. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0020] In this specification, the side of the tip of the barrel from which the pen tip protrudes for writing is referred to as the "tip," and the side opposite the "tip" is referred to as the "rear," the direction from the rear side to the tip side is referred to as the forward direction, the direction from the tip side to the rear side is referred to as the reverse direction, and the front and rear directions corresponding to the forward and reverse directions are referred to as the front-rear direction or axial direction.

[0021] The retractable-grip writing instrument 1 (Figs. 1 to 11) and 61 (Figs. 12 and 13) of the present invention comprises an inner body 3 disposed inside the barrel in the radial direction so as to be movable back and forth in the axial direction. The inner body 3 has a pen tip 8, 8a at its tip. In the writing state, the inner body 3 moves forward within the barrel, causing the pen tip 8, 8a to protrude from the tip of the barrel (Figs. 2(a) and 12(b)). In the stored state, the inner body 3 moves backward within the barrel, causing the pen tip 8, 8a to be stored within the barrel (Figs. 1(a) and 12(a)).

[0022] Hereinafter, the retractable grip writing implements 1 and 61 may be simply referred to as writing implement 1 and writing implement 61.

[0023] In the writing instruments 1, 61 of the present invention, when the inner body 3 moves forward and enters the writing state as shown in Figures 2(a) and 12(b), the outer surface of the grip portion, which is the outer surface of the grip 5 made of elastic material in the axial direction, is exposed from the outer surface of the barrel, which is the outer surface of the barrel in the axial direction at the gripping portion at the front end of the barrel that is held by the user in the writing state (Figures 2(a) and 12(b)).

[0024] Furthermore, in the writing instruments 1, 61 of the present invention, when the inner body 3 moves backward and assumes the stored state as shown in Figures 1(a) and 12(a), the outer surface of the grip portion sinks inward in the axial direction relative to the outer surface of the barrel (Figures 1(a) and 12(a)).

[0025] In the case of conventional writing instruments in which a grip made of elastic material is attached to the grip portion at the front end of the barrel that is held by the user when writing, the outer surface of the grip made of elastic material is exposed to the outer surface of the barrel at the grip portion not only in the writing state described above but also in the storage state described above.

[0026] As a result, when attaching such conventional writing instruments to a pocket or notebook, etc., it can be difficult to attach due to the resistance caused by the elastic grip being exposed at the gripping portion, and when carrying the instrument in a pen case, etc., the outer surface of the grip exposed at the gripping portion rubs against adjacent writing instruments, causing the grip to become dirty, etc., causing other problems.

[0027] As described above, in the retractable grip writing instruments 1, 61 of the present invention, the outer peripheral surface of the grip 5 can be exposed radially outward from the grip portion by moving the inner body 3 forward within the barrel to make the nib 8, 8a protrude from the tip of the barrel and enter the writing state (FIGS. 2(a) and 12(b)). This allows the conventional functions expected from a grip made of an elastic material attached to the grip portion, such as improved gripping feel and anti-slip effect, to be achieved.

[0028] On the other hand, in the storage state (Figs. 1(a), 12(a)) in which the inner body 3 is moved backward within the barrel to store the nibs 8, 8a within the barrel, the grip 5 can be stored radially inward of the gripping portion.

[0029] This makes it possible to eliminate the above-mentioned problems that occur in conventional writing implements in which a grip made of an elastic material is attached to the gripping portion.

[0030] The inner body 3 is arranged inside the barrel in the axial direction so as to be movable back and forth in the axial direction, and has a pen tip 8, 8a at its tip.In the writing state, it moves forward inside the barrel, causing the pen tip 8, 8a to protrude from the tip of the barrel, and in the stored state, it moves backward inside the barrel, causing the pen tip 8, 8a to be stored inside the barrel.The mechanism, structure, and pen tip extension mechanism that move the inner body 3 forward and backward in this way are conventionally known.

[0031] The present invention can also employ mechanisms, structures, and pen tip extension mechanisms that have been conventionally employed.

[0032] Therefore, in the following, we will only provide a rough illustration of the above-mentioned mechanism, structure, and pen tip extension mechanism, and will instead provide a detailed description of one embodiment of the mechanism and structure unique to the present invention, in which when the inner body 3 moves forward to enter the writing state, the outer surface of the grip portion of the grip made of elastic material is exposed from the outer surface of the barrel in the gripping section, and when the inner body 3 moves backward to enter the stored state, the outer surface of the grip portion is recessed inward in the axial direction relative to the outer surface of the barrel.

[0033] 1 to 11 illustrate one embodiment of the present invention relating to a mechanical pencil employing a knock-type feeding mechanism.

[0034] The barrel of the writing implement 1, which extends in the axial direction, is configured by connecting an upper body 2 and a lower body 4 via a body joint 16 (FIG. 1(a)).

[0035] In the illustrated embodiment, as shown in Figure 5, the main body joint 16 is a cylindrical body having an annular rib 16b for fixing the upper main body on the rear end side of the center (right side of Figure 5(a)) and an annular rib 16a for fixing the lower main body on the front end side of the center (left side of Figure 5(a)) (Figures 5(a) and (b)). On the outer periphery of the peripheral wall on the front end side, a plurality of axially extending lower main body positioning ribs 16c are formed at predetermined intervals in the circumferential direction (Figure 5(c)). Furthermore, on the outer periphery of the peripheral wall on the rear end side, axially extending upper main body positioning grooves 16d and 16e are formed (Figures 5(d) and (e)).

[0036] As shown in Figure 4, the upper main body 2 is provided with a clip 18 on the outer side in the axial direction of the rear end side. The clip 18 is provided with a clip ball 18a at the front end that protrudes inward in the axial direction. A claw stopper 19 is provided on the peripheral wall of the upper main body 2 facing the clip 18, which engages with a locking claw 21 of the intermediate main body 3 (described later) to prevent the intermediate main body 3 from moving backward.

[0037] The upper body 2 and the lower body 4 are connected via a body joint 16, and the inner body 3 is accommodated inside the axial diameter of the barrel so as to be movable in the front-rear direction.

[0038] As shown in Figure 7, the inner body 3 has a cylindrical elastic piece 20 at its rear end, which is equipped with an inner body rotation prevention groove 32 extending in the axial direction, and a locking claw 21 is provided at the rear end of the elastic piece 20, which protrudes outward in the axial direction.

[0039] Additionally, a grip push-up protrusion that protrudes outward in the axial direction is provided on the tip side of the inner main body 3. As will be described later, the grip push-up protrusion provided on the inner main body 3 is a part that exposes the outer surface of the grip portion of the grip from the outer surface of the barrel at the grip portion when the inner main body 3 moves back and forth inside the portion that constitutes the grip portion of the lower main body 4 that constitutes the barrel, exposing the outer surface of the grip portion of the grip from the outer surface of the barrel at the grip portion, and also serves to retract the outer surface of the grip portion inward in the axial direction from the outer surface of the barrel.

[0040] In the illustrated embodiment, two grip push-up protrusions 31a, 31b are formed at a predetermined distance in the axial direction on the tip side of the inner main body 3, which is located at a position corresponding to the part that forms the gripping portion of the lower main body 4 that forms the barrel.

[0041] An actuation spring 17 (Fig. 1(a)) extending in the front-to-rear direction is disposed between the spring receiving portion 33 of the intermediate body 3 and the spring receiving portion 16f (Fig. 5(d)) of the main body joint 16. The actuation spring 17 constantly applies a biasing force in the rearward direction to the intermediate body 3.

[0042] When the eraser cover 24 housing the eraser 23 is knocked in the direction indicated by arrow 100 (Fig. 2(a)), the inner body 3 moves forward against the biasing force of the operating spring 17, and then the locking pawl 21 is locked by the pawl stopper 19, as shown in Fig. 2(a). This stops the inner body 3 from moving backward due to the biasing force of the operating spring 17, and the writing state shown in Fig. 2(a) is maintained.

[0043] In the state shown in Figure 2(a), the clip ball 18a provided at the tip of the clip 18 is pushed inward in the axial direction, thereby releasing the engagement between the locking claw 21 and the claw stopper 19, and the inner body 3 moves backward due to the biasing force of the operating spring 17, returning to the stored state shown in Figure 1(a).

[0044] A core tank 14 is housed inside the inner body 3 in the axial direction, and extends in the axial direction and houses a core 15 therein.

[0045] The forward movement of the inner body 3 due to the above-mentioned knocking action causes the nib 8 disposed at the tip of the inner body 3 to protrude through the tip opening of the taper 6 disposed at the tip of the lower body 4, resulting in the writing state shown in Figure 2(a), and the backward movement of the inner body 3 due to the pressing action of the clip ball 18a of the clip 18 causes the nib 8 to retract through the tip opening of the taper 6, resulting in the stored state shown in Figure 1(a).Conventional known mechanisms, structures, and nib extension mechanisms can be used.In the illustrated embodiment, which is a mechanical pencil that employs a knock-type extension mechanism, in addition to the above-mentioned structure and mechanisms, a mechanical joint 13, a mechanical spring 12, a clutch 11, a chuck 10, a lead breaker 9, and an inner taper 7 are disposed on the front end sides of the inner body 3 and the lead tank 14.

[0046] These structures and mechanisms are well known in the art. Although the illustrations show the case of a knock-type mechanical pencil, the system in which the inner body 3, which has the nib 8 at its tip, moves back and forth within the barrel to make the nib 8 appear and disappear from the tip opening of the barrel, which is made up of the lower body 4 and the upper body 3, each having a taper 6 at its tip, depending on whether the writing state or the storage state is being used, can be realized by a well-known structure or mechanism, such as a rotary cam system.

[0047] The writing instrument 1 of the present invention is characterized in that when the inner body 3 moves forward to enter the writing state, the outer surface of the grip portion, which is the outer surface of the grip 5 made of elastic material in the axial direction, is exposed from the outer surface of the barrel, which is the outer surface in the axial direction of the barrel at the grip portion at the front end of the barrel that the user holds in the writing state (Fig. 2(a)), and when the inner body 3 moves backward to enter the stored state, the outer surface of the grip portion is recessed inward in the axial direction from the outer surface of the barrel (Fig. 1(a)). This point will be explained in detail below.

[0048] Figure 6 is a diagram illustrating an example of the lower body 4 constituting the barrel of the writing instrument 1 shown in Figure 1. In the embodiment shown in Figure 6, the lower body 4 is cylindrical and has a tapered mounting screw portion 42 on the outer periphery of the tip and an annular rib 44 on the inner periphery of the rear end for fixing the body joint.

[0049] In the part of the lower body 4 corresponding to the grip portion at the front end of the barrel that is held by the user when writing with the writing instrument 1 shown in Figure 1, as shown in Figure 6, grip entry and exit openings 41a, 41b, 41c, 41d, ... are formed in the grip portion peripheral wall, which is the peripheral wall of the barrel that constitutes the grip portion, and which penetrate the grip portion peripheral wall in the axial direction.

[0050] In the illustrated embodiment, the grip inlet / outlet openings 41a, 41b, 41c, 41d, the grip inlet / outlet openings 41e, 41f, 41g, 41h, and the grip inlet / outlet openings 41i, 41j, 41k, 41l are all formed with a predetermined distance between them in the axial direction.

[0051] In addition, the grip intrusion / removal openings 41a, 41e, 41i, etc., the grip intrusion / removal openings 41b, 41f, 41j, etc., the grip intrusion / removal openings 41c, 41g, 41k, etc., and the grip intrusion / removal openings 41d, 41h, 41l, etc. are all formed at predetermined intervals between each other in the circumferential direction of the gripping portion.

[0052] In this way, in the illustrated embodiment, a plurality of grip entry and exit openings 41 are formed in the peripheral wall of the grip portion, penetrating the peripheral wall of the grip portion in the axial direction at a predetermined interval between each other in the axial direction of the grip portion, and at a predetermined interval between each other in the circumferential direction of the grip portion.

[0053] Hereinafter, in this specification and drawings, the grip insertion / removal openings 41a, 41b, 41c, 41d, . . . may be collectively referred to as grip insertion / removal openings 41.

[0054] On the other hand, the grip 5 is recessed in the grip intrusion / retraction opening 41 in the storage state (Fig. 1(a)), and has a grip protrusion that protrudes outward in the axial direction from the grip intrusion / retraction opening 41 in the writing state (Fig. 2(a)), exposing the outer peripheral surface of the grip portion.

[0055] Fig. 9 is a diagram showing an example of the grip 5 made of an elastic material for the writing instrument 1 shown in Fig. 1. It has been known for some time that a grip made of an elastic material is attached to the grip portion at the front end of the barrel of the writing instrument, which is to be held by the user when writing with the writing instrument. Like such conventionally known grips, the grip 5 can be made from various known elastic materials, such as soft rubber.

[0056] The grip 5 in the embodiment shown in Figure 9 is cylindrical and extends in the axial direction, with a positioning groove 56 extending in the axial direction formed in the large diameter portion on the rear end side, and the front end side of the large diameter portion serving as a grip stopper 53.

[0057] The grip 5 of the embodiment shown in FIG. 9 is provided with an annular grip portion peripheral wall 54 extending in the axial direction on the front end side of the large diameter portion.

[0058] As described above, the grip protrusion, which is recessed in the grip intrusion / retraction opening 41 in the storage state (Figure 1(a)) and protrudes outward in the axial radial direction from the grip intrusion / retraction opening 41 in the writing state (Figure 2(a)) to expose the outer peripheral surface of the grip portion, is structured to protrude outward in the axial radial direction from the outer peripheral surface of the grip portion peripheral wall, which is the outer surface in the axial radial direction of the annular grip portion peripheral wall 54.

[0059] In the writing instrument 1 shown in Figure 1, the grip portion peripheral wall 54 is arranged inside in the axial diameter direction of the grip portion peripheral wall of the barrel of the writing instrument 1, i.e., inside in the axial diameter direction of the grip portion peripheral wall of the main body lower part 4 that forms the grip portion.

[0060] In the illustrated embodiment, the grip portion peripheral wall 54 extends in the axial direction over the length indicated by the symbol L, and the annular grip portion peripheral wall 54, which is arranged inside in the axial radial direction of the grip portion peripheral wall of the main body lower part 4 that forms the grip portion, is cylindrical and has a predetermined length in the axial direction, i.e., the length indicated by the symbol L.

[0061] As described above, the grip entry and exit openings 41 formed in the gripping portion peripheral wall, which is the peripheral wall of the barrel that constitutes the gripping portion, penetrate the gripping portion peripheral wall in the axial direction, and are formed in multiple numbers with a predetermined distance between them in the axial direction, and multiple numbers with a predetermined distance between them in the circumferential direction of the gripping portion.

[0062] In the present invention, as described above, the grip protrusion provided on the grip 5 is recessed in the grip intrusion / retraction opening 41 in the storage state (Fig. 1(a)), and protrudes outward in the axial direction from the grip intrusion / retraction opening 41 to expose the outer peripheral surface of the grip portion in the writing state (Fig. 2(a)).

[0063] Therefore, the above-mentioned grip protrusions provided on the grip 5 are formed in multiple numbers on the outer surface of the grip portion peripheral wall at positions corresponding to the positions where multiple grip intrusion / retraction openings 41 are formed on the grip portion peripheral wall.

[0064] In the illustrated embodiment, grip protrusions 51a, 51b, 51c, 51d and grip protrusions 51e, 51f, 51g, 51h and grip protrusions 51i, 51j, 51k, 51l are formed on the outer peripheral surface of the grip portion peripheral wall, which is the outer surface in the axial direction of the cylindrical grip portion peripheral wall 54 corresponding to the positions where grip intrusion / retraction openings 41a, -, 41d, grip intrusion / retraction openings 41e, -, 41h, and grip intrusion / retraction openings 41i, -, 41l are formed on the lower main body 4, with a predetermined distance between them in the axial direction.

[0065] In addition, grip protrusions 51a, 51e, 51i, etc., grip protrusions 51b, 51f, 51j, etc., grip protrusions 51c, 51g, 51k, etc., and grip protrusions 51d, 51h, 51l, etc. are all formed at predetermined intervals between each other in the circumferential direction of the cylindrical grip portion peripheral wall 54.

[0066] Hereinafter, in this specification and drawings, the grip protrusions 51a, 51b, 51c, 51d, . . . may be collectively referred to as grip protrusions 51.

[0067] In the illustrated embodiment, the cylindrical grip portion peripheral wall 54 is provided with a grip actuation recess that curves outward in the axial direction on the grip portion inner peripheral wall surface that is on the inside in the axial direction.

[0068] In the illustrated embodiment, a grip actuation recess 52a that curves outward in the axial direction is formed between the positions where grip protrusions 51b and 51c are formed on the outer peripheral surface of the grip portion peripheral wall 54, which is the outer radial surface of the grip portion peripheral wall 54, i.e., between the positions where grip protrusions 51j and 51k are formed on the outer peripheral surface of the grip portion peripheral wall 54. The grip actuation recess 52a is an annular groove formed on the inner peripheral surface of the cylindrical grip portion peripheral wall 54 (FIGS. 9(b) and 9(c)).

[0069] In addition, the grip portion inner wall surface, which is the inner surface in the axial radial direction of the cylindrical grip portion peripheral wall 54, is provided with a grip operation convex portion that protrudes inward in the axial radial direction from the grip portion inner wall surface.

[0070] In the illustrated embodiment, grip actuation protrusions 55a and 55b are formed axially in front and behind the position where grip actuation recess 52a is formed on the inner peripheral surface of grip portion peripheral wall 54. Grip actuation protrusions 55a and 55b are annular ridges formed on the inner peripheral surface of cylindrical grip portion peripheral wall 54, and in the illustrated embodiment, grip actuation protrusions 55a and 55b are flat surfaces that extend a predetermined length in the axial direction and are parallel to the grip portion inner peripheral wall surface ( FIG. 9(c) ).

[0071] In addition, grip portion inclined surfaces 56a, 56b, 56c, and 56d are formed from the rear end and / or front end in the axial direction of the inner peripheral wall surface of the grip operation protrusions 55a and 55b, which are the inner surfaces in the axial radial direction of the grip operation protrusions, and extend obliquely outward in the axial radial direction.

[0072] In the illustrated embodiment, the grip actuation protrusion 55a has a grip portion inclined surface 56a at the axial rear end of the inner peripheral wall surface of the grip actuation protrusion. The grip actuation protrusion 55b has a grip portion inclined surface 56b at the axial front end of the inner peripheral wall surface of the grip actuation protrusion, and a grip portion inclined surface 56c at the axial rear end of the inner peripheral wall surface of the grip actuation protrusion (FIG. 9(c)).

[0073] The above-mentioned grip actuation recess 52a, grip actuation protrusions 55a, 55b, and grip portion inclined surfaces 56a, 56b, 56c, and 56d formed on the grip portion inner peripheral wall surface, which is the inside in the axial direction of the cylindrical grip portion peripheral wall 54 of the grip 5, cooperate with two grip push-up protrusions 31a, 31b that the inner main body 3 has at its tip end, spaced a predetermined distance apart in the axial direction, to expose the grip portion outer peripheral surface of the grip 5 from the outer peripheral surface of the barrel at the grip portion when the inner main body 3 moves back and forth inside the part that forms the grip portion of the main body lower part 4 that forms the barrel. This can be explained as follows with reference to Figures 1 to 3.

[0074] 1(a) and 3(a), the grip push-up protrusion 31a at the front in the axial direction of the inner body 3 is fitted into the grip actuation recess 52a. In the illustrated embodiment, the inner body 3 has two grip push-up protrusions 31a and 31b spaced a predetermined distance apart in the axial direction, one grip actuation recess 52a is formed on the inner peripheral wall surface of the grip portion peripheral wall 54, and the grip push-up protrusion 31b at the rear in the axial direction of the inner body 3 abuts against the grip portion inclined surface 56d.

[0075] Due to this arrangement, the grip protrusion 51 protruding outward in the axial direction from the grip portion outer wall surface of the grip portion peripheral wall 54 is recessed into the grip intrusion / retraction opening 41, and the grip portion outer surface is not exposed from the outer surface of the barrel in the gripping portion (Figure 1(b)).

[0076] When the pen is knocked as shown by the arrow 100 in Figs. 2(a) and 3(b) to change from the stored state shown in Figs. 1(a) and 3(a) to the writing state shown in Figs. 2(a) and 3(c), the inner body 3 starts to move forward (Fig. 3(b)).

[0077] When the writing state shown in Figures 2(a) and 3(c) is reached by the forward movement of the inner body 3, the outer surface of the grip push-up convexities, which is the outer surface of the grip push-up convexities 32a, 32b in the axial radial direction, abuts against the inner wall surface of the grip portion that is forward or rearward in the axial direction from the position where the grip actuation recess 52a is formed on the inner wall surface of the grip portion.

[0078] This causes the cylindrical grip portion peripheral wall 54 to be pushed outward in the axial direction, causing the grip protrusion 51 to protrude outward in the axial direction from the grip intrusion / retraction opening 41, exposing the outer peripheral surface of the grip portion (Figures 2(a) and 3(c)).

[0079] In the illustrated embodiment, as the inner body 3 moves forward, the grip push-up convex portion 32a abuts the outer surface of the grip push-up convex portion, which is the outer surface of the grip push-up convex portion 32a in the axial radial direction, against the inner wall surface of the grip portion that is axially forward of the position where the grip actuation recess 52a is formed on the inner wall surface of the grip portion.

[0080] In addition, as the inner body 3 moves forward, the grip push-up convex portion 32b abuts the outer surface of the grip push-up convex portion, which is the outer surface of the grip push-up convex portion 32b in the axial radial direction, against the inner wall surface of the grip portion that is axially rearward of the position where the grip actuation recess 52a is formed on the inner wall surface of the grip portion.

[0081] In the illustrated embodiment, the grip portion inner wall surface axially forward of the position where the grip actuation recess 52a is formed on the grip portion inner wall surface forms a grip actuation protrusion 55a with a flat inner surface that protrudes inward in the axial direction from the grip portion inner wall surface, which is the axially inner surface of the cylindrical grip portion peripheral wall 54. Furthermore, the grip portion inner wall surface axially rearward of the position where the grip actuation recess 52a is formed on the grip portion inner wall surface forms a grip actuation protrusion 55b with a flat inner surface that protrudes inward in the axial direction from the grip portion inner wall surface, which is the axially inner surface of the cylindrical grip portion peripheral wall 54.

[0082] As described above, as the inner body 3 moves forward, the outer surfaces of the grip push-up protrusions 32a, 32b, which are the outer surfaces in the axial direction of the grip push-up protrusions, come into contact with the inner wall surface of the grip portion that is axially forward or backward from the position where the grip actuation recess 52a is formed on the inner wall surface of the grip portion, so that the cylindrical grip portion peripheral wall 54 is pushed outward in the axial direction, and the grip protrusion 51 protrudes outward in the axial direction from the grip intrusion / retraction opening 41, exposing the outer peripheral surface of the grip portion (Figures 2(a) and 3(c)).

[0083] As shown in the figure, the inner wall surface of the grip portion axially forward or rearward of the position where the grip actuation recess 52a is formed on the inner wall surface of the grip portion is formed as flat grip actuation protrusions 55a, 55b, which more reliably allows the lip protrusion 51 to protrude outward in the axial direction from the grip intrusion / retraction opening 41, exposing the outer surface of the grip portion.

[0084] Furthermore, as described above, grip portion inclined surfaces 56a, 56b, 56c, 56d are formed extending obliquely outward in the axial direction from the rear end and / or front end in the axial direction of the inner peripheral wall surface of the grip actuation protrusions, which is the inner surface in the axial radial direction of the grip actuation protrusions 55a, 55b. Therefore, when the grip push-up protrusion 31a of the inner main body 3 is fitted into the grip actuation recess 52a, as in the stored state shown in Figures 1(a) and 3(a), and the inner main body 3 begins to move forward as shown in Figure 3(b), or when the grip push-up protrusion 31a attempts to fit into the grip actuation recess 52a due to backward movement of the inner main body 3 (not shown), the operation can be carried out smoothly.

[0085] FIG. 14 is a diagram illustrating the state in which the writing instrument 1 according to the present embodiment described above is attached to the pocket 101. When inserting the writing instrument 1 into the pocket 101, the writing instrument is inserted from the tip side where the grip is attached, so the presence of a grip often makes insertion difficult. In the present invention, in the stored state shown in FIGS. 1(a), 10(a), and 11(a), the outer circumferential surface of the grip 5 in the axial direction is not exposed to the outside in the axial direction from the outer circumferential wall surface of the barrel. This makes it easier to insert the writing instrument into the pocket 101.

[0086] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and can be modified in various ways within the technical scope grasped from the description of the claims.

[0087] For example, the knock mechanism has been described above as an example of a method for extending a sharpening mechanism, but any method, such as a rotating cam, that can move the inner main body toward the tip may be used.

[0088] Also, for example, it can be designed as a ballpoint pen as shown in FIGS.

[0089] Figures 12 and 13 show a rotating cam type ballpoint pen 61, in which the upper body 2 is provided with an upper body cam portion 28 at the rear end where the knock cam 26 is provided, and a rotor 25 is provided, and a refill 27 is provided radially inside the middle body 3 with a pen tip 8a at the tip, except that the basic configuration and structure are the same as those of the above-mentioned embodiment, so parts that are common to those explained in the above-mentioned embodiment are given the same symbols and their explanations will be omitted.

Claims

1. The pen is provided with an inner body that is disposed inside the barrel in the axial direction so as to be movable back and forth in the axial direction, has a pen tip at its tip, and in a writing state, moves forward inside the barrel to cause the pen tip to protrude from the tip of the barrel, and in a stored state, moves backward inside the barrel to store the pen tip inside the barrel, When the inner body moves forward to enter the writing state, an outer peripheral surface of the grip portion, which is the outer surface of the grip made of an elastic material in the axial direction, is exposed from an outer peripheral surface of the barrel, which is the outer surface of the barrel in the axial direction of the grip portion at the front end side of the barrel that is held by a user in the writing state, When the intermediate body moves in the rearward direction and assumes the stored state, the outer peripheral surface of the grip portion is recessed inward in the shaft radial direction relative to the outer peripheral surface of the barrel. A retractable grip writing instrument.

2. a grip portion peripheral wall, which is a peripheral wall of the barrel that constitutes the grip portion, is provided with a grip entry / exit opening that penetrates the grip portion peripheral wall in the axial radial direction, The grip is recessed in the grip inlet / outlet opening in the stored state, and has a grip protrusion that protrudes outward in the axial direction from the grip inlet / outlet opening in the writing state to expose the outer peripheral surface of the grip portion.

2. The retractable grip writing implement according to claim 1.

3. The grip has an annular grip portion peripheral wall disposed inside the holding portion peripheral wall in the axial radial direction, The grip protrusions protrude outward in the axial direction from an outer peripheral surface of the grip portion peripheral wall, which is the outer surface of the grip portion peripheral wall in the axial direction.

3. The retractable grip writing implement according to claim 2.

4. a plurality of the grip openings are formed at predetermined intervals in the axial direction and at predetermined intervals in the circumferential direction of the grip portion, The grip portion has a cylindrical shape extending in the axial direction, and the grip protrusions are formed on the outer peripheral surface of the grip portion peripheral wall at positions corresponding to the positions where the grip openings are formed in the grip portion peripheral wall.

4. The retractable grip writing implement according to claim 3.

5. The grip portion peripheral wall has a grip operation recess curved outward in the axial radial direction on an inner circumferential wall surface of the grip portion that is on the inside in the axial radial direction, The inner main body has a grip push-up protrusion that protrudes outward in the axial radial direction, In the stored state, the grip push-up convex portion fits into the grip actuation recess, and in the writing state, an outer surface of the grip push-up convex portion, which is an outer surface of the grip push-up convex portion in the axial radial direction, abuts against the inner peripheral wall surface of the grip portion that is forward or rearward in the axial direction from a position where the grip actuation recess is formed on the inner peripheral wall surface of the grip portion.

5. The retractable grip writing implement according to claim 3 or 4.

6. The inner peripheral wall surface of the grip portion, with which the outer surface of the grip push-up protrusion abuts in the writing state, forms a grip actuation protrusion that protrudes inward in the axial direction from the inner peripheral wall surface of the grip portion.

6. The retractable grip writing implement according to claim 5.

7. A grip retractable writing instrument as described in claim 6, wherein a grip portion inclined surface is formed from the rear end and / or front end in the axial direction of the inner peripheral wall surface of the grip actuation convex portion, which is the inner surface in the axial radial direction of the grip actuation convex portion, and extends obliquely outward in the axial radial direction.

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