Writing instrument with malfunction prevention function

Abstract

A writing instrument with a malfunction prevention function is provided with: a cylindrical main body which is provided with a tapered part at the front end and a pressing part at the rear end, and which extends in the front-rear direction; and a clip part which is provided on the rear end side of the main body and which clips the main body against a locking object. A pressing operation is performed by applying a force in a forward direction, which is a direction from the rear end toward the front end, to the pressing part, and a writing front end protrudes from the opening of the tapered part in the forward direction and is held at a writing position, thereby being in a state in which writing can be performed. The purpose of the present invention is to prevent a writing tip from protruding from an opening of a tapered portion when a clip portion is clipped by a locking object and a force in a forward direction is imparted by carelessness toward a pressing portion. A writing instrument with a malfunction prevention function is provided with a pressing guard part at the rear end of the main body, and the pressing guard part prevents the pressing part from being imparted with an inadvertent force in the forward direction when the pressing part is to be imparted with the force in the forward direction.

Description

Technical Field

[0001] The present invention relates to a push-type writing instrument having a clip. In particular, the present invention relates to a writing instrument with a malfunction prevention function in which, when the clip is clipped to a fastening object such as a pocket or a notebook, even if a force for causing it to operate is accidentally applied to the push portion, the writing tip does not protrude from the front end of the barrel. Background Art

[0002] In a push-type writing instrument having a clip, when the clip is clipped to a fastening object such as a pocket or a notebook, if the push portion is accidentally pressed, the writing tip protrudes from the front end of the barrel, and various problems sometimes occur. If Figure 1 an example of a conventional general push-type writing instrument having a clip is shown in

[0003] The cylindrical main body 2 constituting the writing instrument 1 extends in the left-right direction, i.e., the longitudinal direction, in Figure 1 (a), Figure 1 (b), and has a tapered portion 3 at the front end ( Figure 1 the left end in (a)) and a clip portion 6 and a push portion 4 at the rear end ( Figure 1 the right end in (a)).

[0004] Hereinafter, in the present specification, the front end side of the cylindrical main body 2 constituting the writing instrument 1 is defined as the front side, the rear end side is defined as the rear side, the direction from the rear end side of the main body 2 toward the front end side is defined as the forward direction, and the direction from the front end side of the main body 2 toward the rear end side is defined as the backward direction for explanation.

[0005] Normally, as shown in Figure 1 (a), the writing tip 5 is sunk into the opening of the tapered portion 3 and is housed in the main body 2. If a push operation is performed, that is, a force in the forward direction as indicated by an arrow 10 in Figure 1 (b) is applied to the rear end face 4a of the push portion 4, the writing tip 5 protrudes from the opening of the tapered portion 3 and is held in the writing position, and a state in which writing can be performed is achieved ( Figure 1 (b)).

[0006] Figure 5 is a diagram for explaining an example of a malfunction occurring in the conventional general writing instrument 1 shown in Figure 1 , Figure 5 (a) is a partial main view showing a state in which the writing instrument 1 is attached to a pocket 40 of clothing.

[0007] When the writing instrument 1 is attached to the pocket 40, in Figure 1(a) The portion represented by L1 from the rear end of the clip 6 to the rear end of the push button portion 4 protrudes from the edge portion of the pocket 40 in the structure of the writing instrument 1. Figure 5 (a). Figure 5 (c) is a perspective view showing a state in which the conventional general writing instrument 1 shown in Figure 1 is attached to a notebook 41 or the like. Also in this case, in the structure of the writing instrument 1, the portion from the rear end of the clip 6 to the rear end of the push button portion 4 protrudes from the edge portion of the notebook 41.

[0008] Thus, in Figure 1 (a), a non - small (not short) portion represented by L1 protrudes from the edge portion of the pocket 40 and the edge portion of the notebook 41. Therefore, when the writing instrument 1 is attached to the pocket 40, the notebook 41, a document, etc. and carried or used, there is a case where an accidental push operation occurs.

[0009] If an accidental push operation is performed, since the writing tip 5 protrudes from the opening of the tapered portion 3 and is held in the writing position, there is a case where the inside of the pocket 40 is soiled by ink or the like. For example, if an accidental push operation is performed in the state where the writing instrument 1 is attached to the pocket 40 Figure 5 (a), then as shown in Figure 5 (b), the inside of the pocket 40 is soiled by the ink 50 of a ballpoint pen or the like. In addition, if an accidental push operation is performed in the state where the writing instrument 1 is attached to the notebook 41 Figure 5 (c), then as shown in Figure 5 (c), the notebook 41 is soiled by the ink 51 of a ballpoint pen or the like.

[0010] In a push - type writing instrument, as described above, by intentionally pushing the push button portion 4 as indicated by the arrow 10 in Figure 1 (b) to apply a force in the forward direction, a push operation is performed to cause the writing tip 5 to protrude from the opening of the tapered portion 3 and be held in the writing position, setting it to a state where writing can be performed.

[0011] In contrast, there is a case where the push button portion 4 is pushed in the direction indicated by the arrow 10 in Figure 1 (b) unintentionally, that is, a force in the forward direction is applied to the push button portion unintentionally (e.g., accidentally), causing the push button portion to act, the writing tip 5 to protrude from the opening of the tapered portion 3 and be held in the writing position, and becoming a state where writing can be performed.

[0012] Hereinafter, in this specification, a case where a force in the forward direction is accidentally, that is, unintentionally applied to the push button portion, the writing tip 5 protrudes from the opening of the tapered portion 3 and is held in the writing position, and becomes a state where writing can be performed, is referred to as a malfunction in a push - type writing instrument.

[0013] If a malfunction occurs, as described above, an undesirable situation occurs where the pocket 40 and the notebook 41 to which the writing instrument 1 is attached are soiled.

[0014] To prevent such an undesirable situation from occurring, a writing instrument with a malfunction prevention function has been proposed in the past. In the writing instrument with the malfunction prevention function, when a push-type writing instrument equipped with a clip is clipped to a locking object such as a pocket or a notebook with the clip, even if the push portion is accidentally pressed, the writing tip does not protrude from the front end of the barrel.

[0015] For example, in Patent Document 1, a push-type writing instrument equipped with a clip is disclosed. When the writing instrument is inserted into the pocket of a shirt or other clothing and carried, it is possible to prevent the situation where the push portion is accidentally pressed in the inserted state and the refill protrudes beyond the front end of the barrel, soiling the clothing with ink.

[0016] The applicant of the present application has also proposed a push-type writing instrument with a malfunction prevention function. In the push-type writing instrument equipped with a clip, regardless of the strength of the fabric of the pocket or the thickness of the notebook paper, even if the push portion is accidentally pressed while the writing instrument is locked to the pocket or the like by the clip, the writing body does not advance (Patent Document 2).

[0017] Prior Art Documents

[0018] Patent Documents

[0019] Patent Document 1: Japanese Patent Application Laid-Open No. 2008-168443

[0020] Patent Document 2: Japanese Patent No. 6881748 Summary of the Invention

[0021] Problems to be Solved by the Invention

[0022] The present invention relates to a push-type writing instrument, comprising: a cylindrical main body having a tapered portion at the front end and a push portion at the rear end, extending in the front-rear direction, i.e., the longitudinal direction; and a clip portion provided on the rear end side of the main body for clamping the main body to a locking object; and performing a pushing action by applying a force in the forward direction, i.e., from the rear end to the front end, to the push portion, and the writing tip protrudes from the opening of the tapered portion in the forward direction and is held in the writing position, so as to be in a state where writing can be performed.

[0023] An object of the present invention is to provide a writing instrument with a malfunction prevention function. In such a writing instrument, when the clip portion is clipped to a locking object, it is possible to prevent the writing tip from protruding from the opening of the conical portion due to accidentally applying a force in the advancing direction to the pressing portion.

[0024] Means for solving the problem

[0025] The present invention for solving the above problems can be exemplified as follows.

[0026] [1] A writing instrument with a malfunction prevention function, which is a push-type writing instrument, comprising: a cylindrical main body having a conical portion at the front end and a pressing portion at the rear end, extending in the front-rear direction; and a clip portion provided on the rear end side of the main body for clamping the main body to a locking object; by applying a force in the advancing direction from the rear end to the front end of the pressing portion, a pressing action is performed, and the writing tip protrudes from the opening of the conical portion in the advancing direction and is held in the writing position, so as to be in a state where writing can be performed; a pressing protection member portion is provided at the rear end of the main body, and when a force in the advancing direction is accidentally applied to the pressing portion, the pressing protection member portion prevents the accidental application of the force in the advancing direction to the pressing portion.

[0027] [2] The writing instrument with a malfunction prevention function according to [1], wherein the pressing protection member portion has a protection member portion on the rear side of the rear end face of the pressing portion, and the protection member portion covers at least a part of the rear end face of the pressing portion, that is, the rear end face of the pressing portion, when observing the writing instrument with a malfunction prevention function in the advancing direction from the rear side of the writing instrument with a malfunction prevention function, and is fixedly provided relative to the rear end position of the main body.

[0028] [3] The writing instrument with a malfunction prevention function according to [2], wherein the pressing protection member portion has a protection member support portion extending from the rear end of the main body in the retreat direction, that is, from the front end to the rear end, and the protection member portion is supported by the protection member support portion at the rear end of the protection member support portion, that is, the rear end of the protection member support portion.

[0029] [4] The writing instrument with a malfunction prevention function according to [3], wherein the protection member support portion is integrally formed with the main body or is formed separately from the main body.

[0030] [5] The writing instrument with a malfunction prevention function according to [3], wherein the main body has a tail plug at the rear end, and the protection member support portion is integrally formed with the tail plug or is formed separately from the tail plug.

[0031] [6] The writing instrument with a malfunction prevention function as described in [2] or [3], wherein the protective member portion covers a part of the periphery of the rear end surface of the pressing portion from the rear side, and is arc-shaped when observing the writing instrument with a malfunction prevention function in the forward direction from the rear side of the writing instrument with a malfunction prevention function.

[0032] [7] The writing instrument with a malfunction prevention function as described in [2] or [3], wherein the protective member portion is constituted by a plate-like body parallel to the rear end surface of the pressing portion.

[0033] [8] The writing instrument with a malfunction prevention function as described in any one of [3] to [7], wherein the clip portion is supported by the protective member support portion.

[0034] [9] The writing instrument with a malfunction prevention function as described in [8], wherein the position in the front-rear direction of the rear end of the clip portion, that is, the rear end of the clip portion, is substantially the same as the position in the front-rear direction of the protective member portion.

[0035] Advantages of the Invention

[0036] According to the present invention, it is possible to provide a writing instrument with a malfunction prevention function that can prevent the writing tip from protruding from the opening of the tapered portion due to accidentally applying a force in the forward direction to the pressing portion when the clip portion is clipped to an object to be locked. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a view showing a conventional general push-type writing instrument having a clip, Figure 1 (a) is a front view, Figure 1 (b) is a front view showing the state where the pressing portion is pressed.

[0038] Figure 2 is a view showing an example of a writing instrument according to an embodiment of the present invention, Figure 2 (a) is a perspective view, Figure 2 (b) is a top view, Figure 2 (c) is a front view, Figure 2 (d) is a right side view.

[0039] Figure 3 is a Figure 2 partial cutaway view of the writing instrument shown in the figure, Figure 3 (a) is a partial cutaway view of the state where the pressing portion is not pressed, Figure 3 (b) is a partial cutaway view of the state where the pressing portion is pressed, Figure 3 (c) is an explanation of Figure 3 (a) partial cutaway view of the state of the pressing portion in which a part is omitted.

[0040] Figure 4 It is a diagram showing the mechanism for preventing malfunction of the writing instrument illustrated by Figure 2 The diagram shows the mechanism for preventing malfunction of the writing instrument illustrated by Figure 4 (a) is a front view showing that when a force in the forward direction is applied to the pressing part, the pressing protection member prevents the application of this force. Figure 4 (b) is a front view showing that by avoiding the pressing protection member and applying a force in the forward direction to the pressing part, the pressing part can be pressed. Figure 4 (c) is a front view showing the state after pressing following Figure 4 the state illustrated in (b), which becomes a state where writing is possible.

[0041] Figure 5 It is a diagram showing the situation where malfunction occurs in a Figure 1 conventional general writing instrument illustrated by Figure 5 (a) is a partial front view showing the state where a conventional general writing instrument is attached in a pocket of clothing. Figure 5 (b) is a partial front view showing the defective condition that occurs when malfunction occurs in the state illustrated in Figure 5 (a). Figure 5 (c) is a perspective view showing the defective condition that occurs when malfunction occurs when a Figure 1 conventional general writing instrument illustrated by

[0042] Figure 6 It is a diagram showing the mechanism by which the writing instrument of the present invention can prevent malfunction. Figure 6 (a) is a partial front view showing the situation where the writing instrument of the present invention is attached in a pocket of clothing. Figure 6 (b) is a partial perspective view showing the situation where the writing instrument of the present invention is attached to a notebook or the like.

[0043] Figure 7 It is a diagram showing an example of the tapered portion adopted in the Figure 2 writing instrument of the present invention illustrated by Figure 7 (a) is a front view. Figure 7 (b) is a perspective view.

[0044] Figure 8 It is a diagram showing an example of the main body adopted in the Figure 2 writing instrument of the present invention illustrated by Figure 8 (a) is a top view. Figure 8 (b) is a front view. Figure 8 (c) is a left side view. Figure 8 (d) is a right side view. Figure 8 (e) is a partial cross-sectional view.Figure 8 (f) is a cross-sectional view with a part of the push protection part omitted, Figure 8 (g) is a perspective view, Figure 8 (h) is a perspective view observed from another direction.

[0045] Figure 9 It is a diagram for explaining an example of the push part adopted in the writing instrument of the present invention illustrated in Figure 2 (a) is a front view, Figure 9 (a) is a front view, Figure 9 (b) is a cross-sectional view with a part omitted, Figure 9 (c) is a perspective view.

[0046] Figure 10 It is a diagram for explaining an example of the rotor adopted in the writing instrument of the present invention illustrated in Figure 2 (a) is a front view, Figure 10 (a) is a front view, Figure 10 (b) is a cross-sectional view with a part omitted, Figure 10 (c) is a perspective view.

[0047] Figure 11 It is a diagram showing a writing instrument related to another embodiment of the present invention, Figure 11 (a) is a front view, Figure 11 (b) is a cross-sectional view with a part omitted.

[0048] Figure 12 It is a diagram showing a writing instrument related to yet another embodiment of the present invention, Figure 12 (a) is a perspective view of the main body, Figure 12 (b) is a perspective view of the main body observed from a direction different from Figure 12 (a), Figure 12 (c) is a perspective view of the writing instrument. Specific Embodiment

[0049] Refer to Figure 2 , Figure 3 An example of a writing instrument 11 with a malfunction prevention function according to an embodiment of the present invention will be described. In addition, hereinafter, there are cases where the writing instrument 11 with a malfunction prevention function is simply referred to as "writing instrument 11" in this specification.

[0050] The writing instrument 11 of this embodiment includes a main body 12 and a clip part 16 ( Figure 2 ). The main body 12 is cylindrical and extends in the front-rear direction, having a tapered part 13 at the front end ( Figure 2 the left end of (b)) and a push part 14 at the rear end ( Figure 2 the right end of (b)). The clip part 16 is provided on the rear end side of the main body 12 and is used with Figure 1 ,Figure 5 Similar to the clip portion 6 in the conventional writing instrument 1 described above, it functions to clip the main body 12 to a clamping object such as a pocket or a notebook.

[0051] The writing instrument 11 of the present embodiment is used in the same way as Figure 1 the conventional writing instrument 1 described above. As shown by the arrow 10 in Figure 3 (b), it performs a pressing action by applying a force in the forward direction, i.e., from the rear end towards the front end, to the pressing portion 14. As shown in Figure 3 (b), it is a push-type writing instrument in which the writing tip protrudes from the opening of the tapered portion 13 in the forward direction and is held in the writing position, enabling writing.

[0052] The writing instrument 11 of the present embodiment is characterized in that a pressing protection portion 17 is provided at the rear end of the main body 12. When an inadvertent, i.e., unintentional, force in the forward direction is applied to the pressing portion 14, the pressing protection portion 17 prevents such an inadvertent forward force from being applied to the pressing portion 14.

[0053] Except for this point, it can adopt the same form as the Figure 1 structure, configuration, and mechanism of the conventionally known push-type writing instrument exemplified above. Here, the conventionally known push-type writing instrument includes: a cylindrical main body 2 having a tapered portion 3 at the front end and a pressing portion 4 at the rear end and extending in the front-rear direction; and a clip portion 6 provided on the rear end side of the main body 2 for clamping the main body 2 to a clamping object. By applying a force in the Figure 1 (b) as indicated by the arrow 10, i.e., in the forward direction from the rear end towards the front end, a pressing action is performed, and the writing tip 5 protrudes from the opening of the tapered portion 3 in the forward direction and is held in the writing position to enable writing.

[0054] For example, the writing instrument 11 of the present embodiment can be applied as a writing body to a liquid marker, a mechanical pencil, or other appropriate forms. In Figure 2 、 Figure 3 , it is described as an example in the form of having a ballpoint pen refill 19 as a writing body.

[0055] The cylindrical main body 12 constituting the writing instrument 11 extends in the left-right direction, i.e., the longitudinal direction, in Figure 2 (b), Figure 2 (c), Figure 3 (a), Figure 3 (b). It has a tapered portion 13 at the front end ( Figure 2 the left end of (b)) and a pressing portion 14 is provided at the rear end of the main body 12 ( Figure 2 the right end of (b)).

[0056] In the illustrated embodiment, the main body 12 has the following structure: on the inner peripheral wall at its front end, there is a threaded portion 12a for mounting the tapered portion Figure 8 (e), and the tapered portion 13 has a threaded portion 13a Figure 7 (a), and they are mounted between the two.

[0057] Inside the main body 12, as Figure 3 shown in the figure, the refill 19 can be retracted and extended, that is, it can be accommodated so as to be movable in the forward direction and the backward direction.

[0058] The refill 19 is biased in the backward direction by a spring 20 Figure 3 .

[0059] As a mechanism for moving the writing body such as the refill 19 forward by pressing the pressing portion 14 as indicated by the arrow 10 in Figure 3 (b) and extracting it, various conventionally known mechanisms can be adopted. They are well-known mechanisms, and detailed illustrations and descriptions are omitted.

[0060] In the present embodiment, an example of a case where a sampling rotary cam type extraction mechanism is schematically illustrated is shown. The cylindrical main body 12, as Figure 8 (e) shows, has a plurality of main body cam portions 12b provided on the inner peripheral wall at the rear end side at regular intervals in the circumferential direction. The cylindrical pressing portion 14 fitted inside the rear end of the main body 12, as Figure 9 shown, has a plurality of positioning convex portions 14a provided on the outer peripheral wall at the front end side at regular intervals in the circumferential direction, and a cam portion 14b at the front end of the cylindrical portion. In addition, the cylindrical rotor 21 fitted inside the pressing portion 14, as Figure 10 shown, has a plurality of cam portions 21a provided on the outer peripheral wall at the front end side at regular intervals in the circumferential direction, and a refill receiving portion 21b formed to project radially inward at the rear end.

[0061] By pressing the pressing portion 14 as indicated by the arrow 10 in Figure 3 (b), the refill 19 moves forward against the biasing force of the spring 20, and the writing tip 15 provided at the front end of the refill 19 projects from the opening of the tapered portion 13 and is held in the writing position Figure 3 (b). If the refill 19 retreats from the writing position, that is, the forward position shown in Figure 3 (b) by the biasing force of the spring 20 and returns to the Figure 3 retreat position shown in (a), the writing tip 15 sinks into the opening of the tapered portion 13 and is accommodated inside the main body 12 Figure 2 , Figure 3 (a).

[0062] Hereinafter, the structure and configuration in which the writing instrument 11 of the present embodiment is characterized by having a push protection part 17 provided at the rear end of the main body 12 will be mainly described. When an accidental or unintended forward force is applied to the push part 14, the push protection part 17 prevents the accidental forward force from being applied to the push part 14.

[0063] The push protection part 17 includes protection parts 18a and 18c ( Figure 2 , Figure 3 , Figure 11 , Figure 12 ). The protection parts 18a and 18c are fixedly provided at positions behind the rear end face 14a of the push part with respect to the rear end position of the main body 12 ( Figure 2 , Figure 3 , Figure 11 , Figure 12 ). In addition, the protection parts 18a and 18c are configured to cover at least a part of the rear end face of the push part 14, that is, the rear end face 14a of the push part, when the writing instrument 11 is viewed from the rear side in the forward direction ( Figure 2 (d), Figure 12 (c)).

[0064] In Figure 2 , Figure 3 the illustrated form, the protection part 18a is configured to cover about half of the circular rear end face 14a of the push part when the writing instrument 11 is viewed from the rear side in the forward direction ( Figure 2 (d)).

[0065] In this case, the protection part 18a can be formed as a plate-like body parallel to the rear end face 14a of the push part as illustrated in Figure 3 (a), Figure 3 (b), Figure 11 (b).

[0066] In Figure 12 the illustrated form, the protection part 18c is an arc-shaped structure that covers a part of the periphery of the circular rear end face 14a of the push part when the writing instrument 11b is viewed from the rear side in the forward direction ( Figure 12 (c)).

[0067] Regardless of the structure, when an accidental forward force is applied to the push part 14, the protection parts 18a and 18c of the push protection part 17 prevent the above-mentioned force from being applied to the push part 14.

[0068] Regarding this, for the embodiments of Figure 2 , Figure 3 , refer to Figure 4A description will be given. When a forward force indicated by the arrow 10 is to be applied to the pressing portion 14 for a pressing operation, the finger 30 of a person abuts against the protection member 18a of the pressing protection member portion 17 provided on the rear side of the rear end surface 14a of the pressing portion. Here, since the protection member 18a is fixedly provided at the rear end position of the main body 12, the finger 30 cannot apply a forward force indicated by the arrow 10 to the rear end surface 14a of the pressing portion ( Figure 4 (a)).

[0069] Therefore, when a forward force is accidentally applied to the pressing portion 14, the above-mentioned force is prevented from being applied to the pressing portion 14 by the protection member 18a of the pressing protection member portion 17.

[0070] So, when the writing instrument 11 of this embodiment is attached to the pocket 40 or the notebook 41 as Figure 6 shown in the figure, it is possible to prevent malfunctions from occurring, such as the occurrence of problems as in the case of the conventional writing instrument 1 described Figure 4 .

[0071] On the other hand, when a forward force indicated by the arrow 10 is to be applied to the pressing portion 14 for a pressing operation, the finger 30 avoids the protection member 18a of the pressing protection member portion 17 so that the finger 30 does not abut against the protection member 18a, and a forward force indicated by the arrow 10 is applied to the rear end surface 14a of the pressing portion with the finger 30 ( Figure 4 (b)). If this is done, similar to the case of using the conventional writing instrument 1 described Figure 1 , the writing tip 15 protrudes from the opening of the tapered portion 13 in the forward direction and is held in the writing position, and a state where writing can be performed is achieved ( Figure 4 (c)).

[0072] This situation is the same in the case of the writing instrument 11a shown in Figure 11 and the writing instrument 11b shown in Figure 12 . The writing instrument 11b shown in Figure 12 has an arc-shaped structure in which the protection member 18c covers a part of the periphery of the circular rear end surface 14a of the pressing portion when the writing instrument 11b is viewed in the forward direction from the rear side of the writing instrument 11b.

[0073] Figure 12 The differences between the writing instrument 11b shown in Figure 2 and Figure 3 the writing instrument 11 shown in Figure 2 are as follows. In Figure 3In the illustrated writing instrument 11, the shape of the protection member portion 18a is flat plate-shaped, and is configured to cover about half of the rear end surface 14a of the push button portion which will be circular when the writing instrument 11 is viewed in the forward direction from the rear side of the writing instrument 11. In Figure 12 In the illustrated writing instrument 11b, the protection member portion 18c has an arc-shaped configuration that covers a part of the periphery of the rear end surface 14a of the push button portion which will be circular when the writing instrument 11b is viewed in the forward direction from the rear side of the writing instrument 11b. Since only this point is different, regarding Figure 12 the illustrated writing instrument 11b, the description of parts other than the shape and structure of the protection member portion 18c is omitted.

[0074] In Figure 2 、 Figure 3 the illustrated form, the protection member portion 18a has a configuration that covers about half of the rear end surface 14a of the push button portion which will be circular when the writing instrument 11 is viewed in the forward direction from the rear side of the writing instrument 11. As described above, the protection member portion 18a is a member that prevents an accidental force in the forward direction from being applied to the push button portion 14 when an accidental force in the forward direction is inadvertently applied to the push button portion 14. Further, when a force in the forward direction indicated by the arrow 10 is to be applied to the push button portion 14 in order to perform a pushing operation, the protection member portion 18a is avoided so that the human finger 30 does not come into contact with the protection member portion 18a, and a force in the forward direction indicated by the arrow 10 is applied to the rear end surface 14a of the push button portion by the finger 30 ( Figure 4 (b)).

[0075] Therefore, it is not necessary for the protection member portion 18a to cover a large area of the rear end surface 14a of the push button portion, and the area covered by the protection member portion 18a of the rear end surface 14a of the push button portion is as Figure 2 、 Figure 3 illustrated, and a configuration that covers at most about half of the rear end surface 14a of the push button portion is sufficient. Further, from this viewpoint, as Figure 12 illustrated, the protection member portion 18c can be formed into an arc-shaped configuration that covers a part of the periphery of the rear end surface 14a of the push button portion from the rear side, when the writing instrument 11b is viewed in the forward direction from the rear side of the writing instrument 11b.

[0076] In the illustrated embodiment, the push protection member portion 17 includes a protection member support portion 18 ([[]] Figure 2 、 Figure 3 、 Figure 11 ) that extends from the rear end of the main body 12 in the direction from the front end to the rear end, that is, the retraction direction, and a protection member support portion 18b ( Figure 12 ).

[0077] Moreover, the above-described protection member portions 18a and 18c are configured to be supported by the protection member support portions 18 and 18b at the rear ends of the protection member support portions 18 and 18b, that is, at the rear ends of the protection member support portions. Figure 2 , Figure 3 , Figure 11 , Figure 12 ).

[0078] Accordingly, the protection member portions 18a and 18c are configured to be fixedly provided at positions behind the rear end surface 14a of the pressing portion and relative to the rear end position of the main body 12.

[0079] As shown in the figure, the protection member support portions 18 and 18b can be integrally formed with the main body 12. In addition, although not shown, the protection member support portions 18 and 18b can be formed separately from the main body 12, and the protection member support portions 18 and 18b of the pressing protection member portion 17 formed separately from the main body 12 can be attached to the rear end of the main body 12.

[0080] In addition, as in Figure 11 the writing instrument 11a of the illustrated embodiment, the main body 12 can be configured to include a tail plug 22 at the rear end, and the protection member support portion 18 is integrally formed with the tail plug 22. In this case, the protection member support portion 18 and the tail plug 22 can also be formed separately, and the protection member support portion 18 can be attached to the tail plug 22. Figure 11 The illustrated writing instrument 11a is the same as the writing instrument 11 described using Figure 2 , Figure 3 except that the protection member support portion 18 is attached to the tail plug 22, so its description is omitted.

[0081] In the above-described embodiment, the protection member support portion 18 ( Figure 2 , Figure 3 ), the protection member support portion 18b ( Figure 12 ) both cover a part of the outer peripheral surface of the cylindrical pressing portion 14 in the circumferential direction from the outside. The pressing portion 14 slides in the front-rear direction along the inner side wall surfaces of the protection member support portions 18 and 18b.

[0082] In the illustrated embodiment, in Figure 2 (c), the length of the protection member support portion 18 indicated by L3 in the front-rear direction is substantially the same as the length of the pressing portion 14 extending in the rearward direction from the rear end of the main body 12, and the front surfaces of the protection member portions 18a and 18c are in contact with the rear end surface 14a of the pressing portion ( Figure 3 (a), Figure 11 (b), Figure 12 (c)).

[0083] As described above, as long as the protection member portions 18a and 18c that are fixedly provided at the rear end position of the main body 12 and are located on the rear side of the rear end surface 14a of the pressing portion cover at least a part of the rear end surface 14a of the pressing portion when the writing instrument 11 is viewed in the forward direction from the rear side of the writing instrument 11. Therefore, it is also possible to form a structure in which the length of the protection member support portion 18 in the front-rear direction is larger than that shown in the drawing, and there is a space in the front-rear direction between the front surface of the protection member portions 18a and 18c and the rear end surface 14a of the pressing portion.

[0084] In the writing instruments 11, 11a, and 11b of the present embodiment shown in the above drawings, as shown in the drawings, a structure in which the clip portion 16 is supported by the protection member support portion 18 can be formed. In this case, the clip portion 16 can be formed integrally with the protection member support portion 18 that constitutes the pressing protection member portion 17, or can be formed separately.

[0085] As described above, the advantage of forming a structure in which the clip portion 16 is supported by the protection member support portion 18 is particularly achieved when the position of the rear end of the clip portion 16 in the front-rear direction, that is, the position of the rear end of the clip portion, is substantially the same as the position of the protection member portions 18a and 18c in the front-rear direction ( Figure 3 (a), Figure 11 (b), Figure 12 (c)).

[0086] As shown in the drawings, if the position of the rear end of the clip portion 16 in the front-rear direction, that is, the position of the rear end of the clip portion, is substantially the same as the position of the protection member portions 18a and 18c in the front-rear direction, then when the writing instrument 11 is attached to the pocket 40 or the like, the portion indicated by L2 in Figure 2 (c) is the size (length) protruding from the edge portion of the pocket 40 and the edge portion of the notebook 41 ( Figure 6 ).

[0087] Since, as described above, the position of the rear end of the clip portion 16 in the front-rear direction, that is, the position of the rear end of the clip portion, is substantially the same as the position of the protection member portions 18a and 18c in the front-rear direction, the length of the portion indicated by L2 is very small (short) as shown in Figure 2 (c), Figure 6 as shown in the drawings.

[0088] Therefore, if such a structure is adopted, when the writing instrument 11 is attached to the pocket 40, the notebook 41, the document, etc. and carried or used, the protrusion is less, and malfunctions, dropping, etc. can be reduced, which is advantageous.

[0089] The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above embodiments, and various modifications can be made within the technical scope defined by the claims.

Claims

1. A writing instrument with a malfunction prevention function, which is a push-type writing instrument and includes: a cylindrical main body having a conical portion at the front end and a push portion at the rear end, extending in the front-rear direction; and a clip portion provided on the rear end side of the main body to clip the main body to a locking object. By applying a force in the forward direction, i.e., from the rear end toward the front end, to the push portion, a pressing action is performed, and the writing tip protrudes from the opening of the conical portion in the forward direction and is held in the writing position, enabling a writing state. It is characterized in that a push protection member portion is provided at the rear end of the main body, and when an accidental force in the forward direction is applied to the push portion, the push protection member portion prevents the accidental force in the forward direction from being applied to the push portion.

2. The writing instrument with a malfunction prevention function according to claim 1, characterized in that the push protection member portion has a protection member portion at the rear side of the rear end face of the push portion. When observing the writing instrument with a malfunction prevention function in the forward direction from the rear side of the writing instrument with a malfunction prevention function, the protection member portion covers at least a part of the rear end face of the push portion, i.e., the rear end face of the push portion, and is fixedly provided relative to the rear end position of the main body.

3. The writing instrument with a malfunction prevention function according to claim 2, characterized in that the push protection member portion has a protection member support portion extending from the rear end of the main body in the backward direction, i.e., from the front end toward the rear end, and the protection member portion is supported by the protection member support portion at the rear end of the protection member support portion, i.e., the rear end of the protection member support portion.

4. The writing instrument with a malfunction prevention function according to claim 3, characterized in that the protection member support portion is integrally formed with the main body or is formed separately from the main body.

5. The writing instrument with a malfunction prevention function according to claim 3, characterized in that the main body has a tail plug at the rear end, and the protection member support portion is integrally formed with the tail plug or is formed separately from the tail plug.

6. The writing instrument with a malfunction prevention function according to claim 2 or 3, characterized in that the protection member portion covers a part of the periphery of the rear end face of the push portion from the rear side, and is arc-shaped when observing the writing instrument with a malfunction prevention function in the forward direction from the rear side of the writing instrument with a malfunction prevention function.

7. The writing instrument with a malfunction prevention function according to claim 2 or 3, characterized in that the protection member portion is composed of a plate-like body parallel to the rear end face of the push portion.

8. The writing instrument with a malfunction prevention function according to claim 3, characterized in that the clip portion is supported by the protection member support portion.

9. The writing instrument with a malfunction prevention function according to claim 8, characterized in that the position of the rear end of the clip portion, i.e., the rear end of the clip portion, in the front-rear direction is substantially the same as the position of the protection member portion in the front-rear direction.

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