Knock-type writing instrument

Abstract

To prevent unintentional pressing of a knock button in a knock-type writing instrument.SOLUTION: The knock-type writing instrument includes: a barrel; a slit formed in the front of the barrel along a longitudinal direction; a refill housed in the barrel and having a writing tip; a knock rod for housing a rear part of the refill inside and having a knock button formed at its rear end; a locking protrusion protrusively provided on the front of the knock rod and movable in a direction while protruding outward from the slit; a clip pivotally supported at the rear end of the barrel so as to swing and always biased so that its tip part faces the slit and contacts the barrel; a ball part protrusively provided from the tip part of the clip toward the slit and contacting the barrel when the clip is biased; and a locking wall formed inside the ball part and abutting the locking protrusion when the ball part is in contact with the barrel. The abutment between the locking wall and the locking protrusion prevents the knock button from being pressed, and the swinging of the clip releases the abutment between the locking wall and the locking protrusion, allowing the knock button to be pressed.SELECTED DRAWING: Figure 7C

Description

[Technical Field]

[0001] The present disclosure relates to a knock-type writing instrument. [Background technology]

[0002] A variety of so-called knock-type writing implements have been provided in the past, in which a writing tip is protruded from the front end of the barrel by pressing a knock button protruding from the rear end of the barrel, and used for writing. Among such knock-type writing implements, various technologies have been proposed in which a clip provided on the barrel is used to maintain or release the protruding state of the writing tip, or both (for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 60-138783 [Patent Document 2] Japanese Patent Application Publication No. 8-258488 [Patent Document 3] Utility Model No. 3154090 Summary of the Invention [Problem to be solved by the invention]

[0004] When a knock-type writing instrument with a clip is clipped to the breast pocket of a shirt or jacket and stored, the knock button can be accidentally pressed, causing the protruding writing tip to soil the inside of the pocket. Also, small children can accidentally press the knock button, enabling writing, which can be used for graffiti.

[0005] The knock-type writing instrument of the present disclosure has an object to prevent the knock button from being unintentionally pressed. [Means for solving the problem]

[0006] A knock-type writing instrument according to a first aspect of the present disclosure comprises: A shaft cylinder and a slit formed on the front surface of the barrel along the longitudinal direction; a refill housed in the barrel and having a writing tip; a knock rod that accommodates the rear portion of the refill and has a knock button formed at its rear end; a locking projection provided on a front surface of the knock rod and movable in the front-rear direction within the slit; a clip that is pivotally supported on the rear end of the barrel so as to be able to swing, and whose tip end is always biased so as to contact the barrel while facing the slit; a ball portion that protrudes from the tip portion of the clip toward the slit and contacts the barrel when the clip is biased; a locking wall formed inside the ball portion and positioned in front of the locking projection when the ball portion is in contact with the barrel; When the locking protrusion is in contact with the rear end surface of the locking wall, the knock button is prevented from being pressed. The clip swings to release the engagement protrusion from the engagement wall, thereby allowing the knock button to be pressed.

[0007] A knock-type writing instrument according to a second aspect of the present disclosure has the same configuration as the first aspect, but also has: the clip includes a swinging member and a clip spring that biases the tip portion of the swinging member so as to contact the barrel; One of the clip-side connecting portion formed on the swing member and the barrel-side connecting portion formed on the barrel is configured as a support shaft, and the other is configured as a bearing hole, By receiving the support shaft in the bearing hole, the swinging member is swingably connected to the shaft cylinder, By setting the size of the bearing hole larger than that of the support shaft, the swinging member can swing relative to the barrel while being connected to the barrel, The support shaft abuts against the periphery of the bearing hole, thereby restricting the swinging of the swing member relative to the shaft cylinder.

[0008] It is preferable that the angle formed between the rear end face of the locking wall and the axial direction of the barrel is 45° to 100°.

[0009] A knock-type writing instrument according to a third aspect of the present disclosure has the configuration of any one of the first to third aspects, and further comprises: a front barrel that is screwed onto the front end of the barrel; a connecting portion protruding forward from a tip portion of the barrel; a male thread portion formed on an outer peripheral surface of the connection portion; a female screw portion formed on an inner peripheral surface of the front barrel and threadedly engaged with the male screw portion; a rear step formed on a tip end surface of the connection portion; a front step formed on the tip side of the female screw portion of the front barrel and engaging with the rear step; Further provided are:

[0010] A knock-type writing instrument according to a fourth aspect of the present disclosure has the same configuration as the fourth aspect, but further comprises: Further provided is a grip portion that covers the outer peripheral surface of the tip end side of the barrel, a leading edge of the grip portion is formed as an annular portion that annularly covers a rear end portion of the connection portion; When the front barrel is screwed onto the connecting portion, the annular portion is sandwiched between the front barrel and the barrel tube. [Effects of the Invention]

[0011] The configuration of the knock-type writing instrument of the present disclosure makes it possible to prevent the knock button from being pressed unintentionally. [Brief explanation of the drawings]

[0012] [Figure 1A] 1 is a front view of a knock-type writing instrument according to a first embodiment in a non-writing state; [Figure 1B] FIG. 1B is a side view of the knock-type writing instrument of FIG. 1A. [Figure 1C]FIG. 2 is a cross-sectional view of FIG. 1A. [Figure 1D] FIG. 1D is a partially enlarged view of FIG. 1C. [Figure 2] 1 is a front perspective view showing an assembly diagram of a knock-type writing instrument according to a first embodiment. FIG. [Figure 3A] FIG. [Figure 3B] FIG. [Figure 3C] FIG. 2 is a front perspective view of the tip portion of the barrel. [Figure 3D] FIG. 3B is a cross-sectional view taken along line III-III of FIG. 3A. [Figure 4A] FIG. 2 is a front perspective view of the front barrel. [Figure 4B] FIG. [Figure 4C] FIG. [Figure 4D] FIG. [Figure 4E] FIG. 1 is a bottom view of the front barrel. [Figure 4F] 4D is a cross-sectional view of FIG. 4C taken along line IV-IV. [Figure 5A] FIG. [Figure 5B] FIG. [Figure 5C] FIG. [Figure 5D] FIG. 5C is a cross-sectional view of FIG. 5B. [Figure 6A] FIG. [Figure 6B] FIG. [Figure 6C] FIG. [Figure 6D] FIG. [Figure 6E] 6A and 6C. FIG. [Figure 7A] 1 is a front view showing a state in which a knock button is pressed in a non-writing state in a knock-type writing instrument according to a first embodiment. FIG. [Figure 7B] The state of FIG. 7A is shown in side view. [Figure 7C]7B is a cross-sectional view taken along line VII-VII of FIG. 7A. [Figure 7D] FIG. 7D is a partially enlarged view of FIG. 7C. [Figure 8A] 1 is a front view showing a state in which the clip is swung in the knock-type writing instrument of the first embodiment. FIG. [Figure 8B] The state of FIG. 8A is shown in side view. [Figure 8C] FIG. 8B is a cross-sectional view taken along line VIII-VIII in FIG. 8A. [Figure 9A] 1 is a front view showing a state in which a knock button is pressed in a writing state in a knock-type writing instrument according to a first embodiment. FIG. [Figure 9B] The state of FIG. 9A is shown in side view. [Figure 9C] 9B is a cross-sectional view taken along line IX-IX of FIG. 9A. [Figure 10A] FIG. 10 is a front view of a knock-type writing instrument according to a second embodiment, showing a state in which the knock button is pressed in a non-writing state. [Figure 10B] The state of FIG. 10A is shown in a side view. [Figure 10C] 10B is a cross-sectional view taken along the line XX in FIG. 10A. [Figure 10D] FIG. 10D is a partially enlarged view of FIG. 10C. [Figure 11] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the present disclosure will be described below. Note that reference numerals commonly used in multiple drawings indicate common components or parts even if no specific explanation is given for each drawing. Furthermore, the dimensions and proportions of each part shown in the drawings do not necessarily correspond to the dimensions and proportions of the actual product. Furthermore, the dimensional relationships and proportions between the drawings may differ.

[0014] In addition, in this disclosure, the side of the applicator where the writing tip is located is referred to as the "tip," the direction toward the tip is referred to as the "forward," the opposite side is referred to as the "rear end," and the direction toward the rear end is referred to as the "rear."

[0015] (1) First embodiment (1-1) Overall structure 1A to 1D show the appearance of a knock-type writing instrument 10 according to a first embodiment of the present disclosure, in a front view (FIG. 1A), a side view (FIG. 1B), a cross-sectional view taken along line II of FIG. 1A (FIG. 1C), and a partially enlarged view (FIG. 1D) of FIG. 1C. FIG. 2 shows a front perspective view of an assembly diagram of the knock-type writing instrument 10 of FIGS. 1A to 1C.

[0016] 1A and 1B, the knock-type writing instrument 10 of this embodiment has an exterior comprising a barrel 20, a front barrel 30, a clip 40, a knock button 71, and a grip portion 12. That is, the front barrel 30 is attached to the front end of the barrel 20, the knock button 71 protrudes from the rear end of the barrel 20, the clip 40 is attached to the rear end of the barrel 20, and the grip portion 12 is formed on the outer periphery of the front end portion of the barrel 20. The clip 40 is journaled on a support shaft 25 formed on the barrel 20 side and is able to swing along a bearing hole 55, which is an elongated hole that curves slightly rearward.

[0017] As shown in FIGS. 1C and 2, the knock-type writing instrument 10 of this embodiment is composed of a barrel 20, a front barrel 30, a clip 40, a knock rod 70, and a refill 80. As described above, the barrel 20 has a grip portion 12 formed around the outer periphery of the tip portion, and a longitudinal slit 27 formed slightly rearward in the middle portion of the front surface. Furthermore, a pair of support shafts 25 are formed on both sides of a connecting portion 21 extending from the front rear end of the barrel 20, serving as barrel-side connecting portions. The front barrel 30 is tapered overall. The rear end portion of the knock rod 70 forms a knock button 71. A locking projection 74 projects from the front surface of the knock rod 70, approximately one-quarter of the way from the tip. This locking projection 74 projects outward from the slit 27 of the barrel 20 (FIG. 1C). 1C, a knock spring 11 is interposed between a support step 28 formed in the internal space of barrel 20 and the tip of a knock rod 70 housed in barrel 20. The structures of barrel 20, front barrel 30, and knock rod 70 will be described in detail below.

[0018] The clip 40 is pivotally supported at the rear end of the barrel 20 and is constantly biased so that its tip portion faces the slit 27 and contacts the barrel 20. The clip 40 includes a swinging member 50 and a clip spring 60. The swinging member 50 is formed with a pair of bearing holes 55 as clip-side connecting portions. A locking wall 52 is formed on the inner tip side of the swinging member 50 (FIG. 1C). The structure of the swinging member 50 will be described in detail later. The clip spring 60 is configured as a leaf spring made of a long metal plate that is bent significantly at one location and bent slightly at another location. A base portion 61 and an intermediate portion 63 are located via a bent portion 62, which is a significantly bent portion, and a contact portion 64, which is a slightly bent portion, is located between the intermediate portion 63 and an end portion 65. 1C, the base portion 61 (see FIG. 2) is inserted into the barrel-side spring bearing 26 (see FIG. 3D) of the barrel 20, the end portion 65 is inserted into the tip end side on the back side of the oscillating member 50, and the contact portion 64 contacts the middle part on the back side of the oscillating member 50. The clip spring 60 biases the tip end portion of the oscillating member 50 so that it contacts the side surface of the barrel 20.

[0019] The refill 80 is housed in the barrel 20, and has a structure in which a ballpoint pen tip 83 serving as a writing tip is attached to the tip of an ink reservoir 81. Ink 82 (FIG. 1C) is housed inside the ink reservoir 81. The ballpoint pen tip 83 has a structure in which a metal writing ball 85 is held at the tip of a metal holder 84. Note that in this embodiment, the refill 80 is formed as a ballpoint pen refill, but it may also be formed as a refill for a marker pen, mechanical pencil, or other writing implement.

[0020] (1-2) Shaft cylinder 20 3A to 3D show the barrel 20 used in the knock-type writing instrument 10 of this embodiment in a front view (FIG. 3A), a side view (FIG. 3B), a front perspective view of the tip portion (FIG. 3C), and a cross-sectional view taken along line III-III in FIG. 3A. The barrel 20 is formed by two-color molding of a relatively hard synthetic resin such as polycarbonate that forms the main body, and a relatively soft synthetic resin such as elastomer that forms the grip portion 12.

[0021] A smaller-diameter connecting portion 21 protrudes forward from the tip portion of barrel 20. A male thread portion 22 is formed on the outer peripheral surface of connecting portion 21. The tip surface of connecting portion 21 is formed as a helical surface, and a step formed at the tip is a rear step 23. The outer peripheral surface at the tip side of barrel 20 is covered with grip portion 12, which is formed from a synthetic resin material different from that of the main body portion of barrel 20. The tip edge of grip portion 12 is formed as an annular portion 13 that annularly covers the rear end portion of connecting portion 21 (Fig. 3C).

[0022] A slit 27 is formed along the longitudinal direction at a slightly rearward intermediate portion of the front of the barrel 20. A pair of connecting portions 21 are erected from the front of the rear end of the barrel 20, and each of them has A pair of support shafts 25 protrude laterally as barrel-side connecting portions. Note that, instead of the support shafts 25 of this embodiment, bearing holes 55 provided in the swinging member 50 may be provided as barrel-side connecting portions in this embodiment. Also, a barrel-side spring retainer 26 (FIG. 3D), which is a hole with a closed tip, is formed in the middle of the connecting portion 21. As shown in FIG. 1C, an end portion 65 (see FIG. 2) of a clip spring 60 is inserted into this barrel-side spring retainer 26.

[0023] (1-3) Front axis 30 Figures 4A to 4F show the tip barrel 30 used in the knock-type writing instrument 10 of this embodiment in a front oblique view (Figure 4A), a rear oblique view (Figure 4B), a front view (Figure 4C), a plan view (Figure 4D), a bottom view (Figure 4E), and a cross-sectional view taken along line IV-IV of Figure 4C.

[0024] Front barrel 30 has an overall tapered, generally truncated cone shape with both ends open, and is composed of a relatively large-diameter rearward covering portion 31 and a relatively small-diameter, tapered portion 34 with a step in between. A tip opening 35 is formed at the tip of tapered portion 34. A female thread portion 32 (FIGS. 4B, 4F) is formed on the inner circumferential surface of covering portion 31. Female thread portion 32 threadably engages with male thread portion 22 of connecting portion 21 of barrel tube 20, thereby threadably attaching front barrel 30 to the tip of barrel 20. A step is formed on the tip side of female thread portion 32, and this step is front step 33 (FIG. 4B) that engages with the aforementioned rear step 23 (FIG. 3C). The internal space of front barrel 30 tapers in steps, and a plurality of ribs 36 are evenly distributed radially around the inner periphery of tapered portion 34 (FIGS. 4B, 4D, 4F). These ribs 36 position the tip portion of refill 80 (see FIG. 1C). When front barrel 30 is screwed into connecting portion 21, the screwing stops when rear step 23 abuts front step 33. At the same time, annular portion 13 (FIG. 3C) described above is sandwiched between front barrel 30 and barrel tube 20, preventing loosening between front barrel 30 and barrel tube 20 (see FIG. 1D).

[0025] (1-4) Knock stick 70 5A to 5D show a knock bar 70 used in the knock-type writing instrument 10 of this embodiment in a front perspective view (FIG. 5A), a front view (FIG. 5B), a side view (FIG. 5C), and a VV cross-sectional view (FIG. 5D) of FIG. 5B.

[0026] The knock rod 70 has a generally cylindrical shape with a closed rear end. The rear end of the knock rod 70 is formed in a generally hemispherical shape, and the area near this rear end forms a knock button 71 that protrudes from the rear end of the barrel 20. The internal space of the knock button 71 forms a storage compartment 72 that stores the rear portion of the refill 80 (FIG. 5D). A locking projection 74 protrudes from the front of the knock rod 70, approximately one-quarter of the way from the tip. The locking projection 74 is movable back and forth within the slit 27 (see FIG. 8C). In addition, a window 73, which is a single elongated hole extending along the longitudinal direction, is formed on both side surfaces of the knock rod 70. Through this window 73, the remaining amount of ink 82 (see FIG. 1C) inside the ink containing tube 81 housed inside can be visually confirmed.

[0027] (1-5) Swinging member 50 Figures 6A to 6E show the swinging member 50 used in the knock-type writing instrument 10 of this embodiment in a front view (Figure 6A), a side view (Figure 6B), a rear view (Figure 6C), a rear perspective view (Figure 6D), and a cross-sectional view (Figure 6E) taken along line VI-VI of Figures 6A and 6C.

[0028] The oscillating member 50 has a long, plate-like shape with a tapered tip and a generally circular rear end when viewed from the front ( FIG. 6A ). Both sides of the oscillating member 50 are formed as a pair of plates that protrude inward, with a recessed middle. The leading ends of the pair of plates form a ball portion 51, and the rear ends form a sliding portion 54. A pair of bearing holes 55 are formed in the sliding portion 54 as a clip-side connecting portion. Note that, instead of the bearing holes 55 of this embodiment, the clip-side connecting portion may be a support shaft 25 provided in the barrel 20. In other words, either the clip-side connecting portion formed in the oscillating member 50 or the barrel-side connecting portion formed in the barrel 20 is configured as the support shaft 25, and the other is configured as the bearing hole 55. The bearing holes 55 receive the aforementioned support shaft 25 (see FIG. 1B ) therein, thereby connecting the oscillating member 50 to the barrel 20 in a manner that allows the oscillating member 50 to oscillate. Furthermore, the bearing hole 55 is set to be larger than the support shaft 25, so that the oscillating member 50 can oscillate relative to the shaft tube 20 while remaining connected to the shaft tube 20. Furthermore, the support shaft 25 abuts against the periphery of the bearing hole 55, thereby restricting the oscillating member 50 from oscillating relative to the shaft tube 20 (see FIG. 1B).

[0029] A ball portion 51 protrudes from the tip of the swinging member 50 of the clip 40 toward the slit 27 (FIG. 1C) (FIGS. 6B, 6D, and 6E). When the clip 40 is biased by the clip spring 60 and comes into contact with the barrel 20, the ball portion 51 sandwiches a cloth or the like between the ball portion 51 and the surface of the barrel 20 when the knock-type writing instrument 10 is attached to a pocket or the like. A plate-shaped locking wall 52 is formed on the inside of the ball portion 51, connecting both side surfaces of the ball portion 51 (FIGS. 6C, 6D, and 6E). When the ball portion 51 is in contact with the barrel 20, the locking wall 52 is located in front of the locking protrusion 74 (FIG. 1C). The rear end of the front of the swinging member 50 serves as an operating portion 53 that is pressed down when the clip 40 is operated.

[0030] Figures 7A to 7D show the state in which the knock button 71 is pressed in a non-writing state in the knock-type writing instrument 10 of this embodiment, using a front view (Figure 7A), a side view (Figure 7B), a cross-sectional view (Figure 7C) taken along line VII-VII of Figure 7A, and an enlarged view (Figure 7D) of a portion of Figure 7C.

[0031] 1A to 1C, the locking protrusion 74 of the knock bar 70 is in contact with the rear end surface of the locking wall 52 of the clip 40 as shown in Figures 7C and 7D, and therefore the locking protrusion 74 cannot move forward. This prevents the knock button 71 from being pressed, and prevents the ballpoint pen tip 83 serving as the writing tip from unintentionally protruding from the tip opening 35 (Figures 7A to 7C).

[0032] In this embodiment, when the rear end surface of the locking wall 52 and the front end surface of the locking projection 74 are in contact with substantially the same plane, the angle θ ( FIG. 7D ) formed between the rear end surface of the locking wall 52 and the axial direction of the barrel 20 is set to 45° to 100°, preferably 75° to 100°, and more preferably 90° to 100°. The relationship between the angle θ and the load required to forcibly press the knock button 71 (hereinafter referred to as the "knock load" in units of N) is shown in Table 1 below. When the angle θ is 45° or greater, the knock load is 3.5 N or greater, which generally prevents the knock button 71 from being unintentionally pressed. More preferably, when the angle θ is 75° or greater, the knock load exceeds 7 N, and when the angle θ is 90° or greater, the knock load is 31 N or greater. In either case, such knock loads do not occur in practice. In Table 1 below, when the angle θ is 0°, it means the knock load when no locking wall is provided on the clip 40. When the angle θ is greater than 100° and not listed in Table 1 below, the knock load will further increase. Therefore, the angle θ in Fig. 7D may be between 100° and 180°.

[0033] [Table 1]

[0034] 8A to 8C show a state in which the clip is swung in the knock-type writing instrument 10 of this embodiment, in a front view (FIG. 8A), a side view (FIG. 8B), and a cross-sectional view (FIG. 8C) taken along line VIII-VIII of FIG. 8A.

[0035] 1A to 1C, when operating portion 53 of swinging member 50 of clip 40 is pressed down, clip 40 swings outward about support shaft 25 as shown in FIGS. 8A to 8C. This releases the abutment between the rear end surface of locking wall 52 and locking protrusion 74, making knock button 71 pressable.

[0036] 9A to 9C show the state in which the knock button 71 is pressed in the writing state in the knock-type writing instrument 10 of this embodiment, in a front view (FIG. 9A), a side view (FIG. 9B), and a cross-sectional view (FIG. 9C) taken along line IX-IX of FIG. 9A.

[0037] 8A to 8C, when knock button 71 is pressed against the biasing force of knock spring 11, ballpoint pen tip 83, serving as the writing tip, protrudes from tip opening 35, as shown in FIGS. 9A to 9C. When operating portion 53 of clip 40 is released from the depressed state, the tip of clip 40 is again biased toward barrel tube 20 and comes into contact with barrel tube 20. At the same time, knock bar 70 moves rearward due to the biasing force of knock spring 11, but locking protrusion 74 abuts against the tip surface of locking wall 52, preventing knock bar 70 from moving further backward. In this state, writing with knock-type writing instrument 10 is possible.

[0038] 9A to 9C, pressing down operating portion 53 of clip 40 again releases locking protrusion 74 from locking wall 52, and knock bar 70 moves rearward due to the biasing force of knock spring 11. This causes ballpoint pen tip 83, which serves as the writing tip, to retract into the front barrel, returning to the non-writing state shown in FIGS. 1A to 1C.

[0039] (2) Second embodiment Figures 10A to 10D show the state in which the knock button 71 is pressed in a non-writing state in a knock-type writing instrument 10 of the second embodiment of the present disclosure, in the form of a front view (Figure 10A), a side view (Figure 10B), a cross-sectional view along line XX of Figure 10A (Figure 10C), and an enlarged partial view of Figure 10C (Figure 10D).

[0040] The structure of the knock-type writing instrument 10 of this embodiment is the same as that of the knock-type writing instrument 10 of the first embodiment, except that a rear projection 52A is provided on the locking wall 52 and a front projection 74A is provided on the locking projection 74. That is, a front projection 74A that protrudes forward is provided from the tip end surface of the locking projection 74 (FIGS. 10C and 10D).

[0041] 11 is a side cross-sectional view of the swinging member 50 used in the knock-type writing instrument 10 of this embodiment. A rear projection 52A is provided on the rear end surface of the locking wall 52, projecting rearward.

[0042] 10A to 10C show a state in which knock button 71 is pressed in knock-type writing instrument 10 in a non-writing state. In this state, as shown in Fig. 10D, rear projection 52A of locking wall 52 abuts against the tip surface of locking projection 74, and at the same time, the front projection of locking projection 74 abuts against the rear end surface of locking wall 52, preventing locking projection 74 from moving further forward. This prevents knock button 71 from being pressed, preventing ballpoint pen tip 83, serving as the writing tip, from unintentionally protruding from tip opening 35 (Figs. 10A to 10C).

[0043] 10A to 10C, pressing the operating unit 53 to swing the clip 40 as shown in Figures 8A to 8C will press the knock button 71 and place the knock-type writing instrument 10 in the writing state, as in the first embodiment. Then, as shown in Figures 9A to 9C, pressing the operating unit 53 again in the writing state will return the writing state, also as in the first embodiment.

[0044] In this manner, in this embodiment, the front protrusion 74A and the rear protrusion 52A are provided, so that the knock button 71 can be prevented from being unintentionally pressed when not in writing, even when the angle θ shown in FIG. 10D exceeds 100°. Here, when the angle θ is 180°, the locking wall 52 has a hook shape in the cross section shown in FIG. 10D. Therefore, it is possible to more effectively prevent the knock button from being unintentionally pressed, provided that the components are not destroyed. [Industrial Applicability]

[0045] The technology of the present disclosure can be used in writing instruments such as ballpoint pens, marking pens, and mechanical pencils, which have a writing tip that appears and disappears when clicked. [Explanation of symbols]

[0046] 10 Writing implement 11 Knock spring 12 Grip part 13 Annular section 20 shaft cylinder 21 connection portion 22 male thread portion 23 rear step 24 mounting portion 25 support shaft (shaft tube side connection portion) 26 Axle tube side spring holder 27 Slit 28 Support step 30 front barrel 31 coating portion 32 female screw portion 33 Front step 34 Tapered portion 35 Tip opening 36 Ribs 40 clips 50 swinging member 51 ball portion 52 locking wall 52A Rear protrusion 53 Operating part 54 Sliding part 55 Bearing hole (clip side connection part) 56 Clip side spring holder 60 clip spring 61 base 62 bent portion 63 Middle part 64 Contact part 65 End part 70 Knock rod 71 Knock button 72 Storage section 73 Window 74 Locking protrusion 74A Front protrusion 80 Refill 81 Ink reservoir 82 Ink 83 Ballpoint pen tip (writing tip) 84 Holder 85 Writing Ball

Claims

1. A shaft cylinder and a slit formed on the front surface of the barrel along the longitudinal direction; a refill housed in the barrel and having a writing tip; a knock rod that accommodates the rear portion of the refill and has a knock button formed at its rear end; a locking projection provided on a front surface of the knock rod and movable in the front-rear direction within the slit; a clip that is pivotally supported on the rear end of the barrel so as to be able to swing, and whose tip end is always biased so as to contact the barrel while facing the slit; a ball portion that protrudes from the tip portion of the clip toward the slit and contacts the barrel when the clip is biased; a locking wall formed inside the ball portion and positioned in front of the locking projection when the ball portion is in contact with the barrel; When the locking protrusion is in contact with the rear end surface of the locking wall, the knock button is prevented from being pressed. The knock-type writing implement has a structure in which the locking projection is released from contact with the locking wall by swinging the clip, thereby making it possible to press the knock button.

2. the clip includes a swinging member and a clip spring that biases the tip portion of the swinging member so as to contact the barrel; One of the clip-side connecting portion formed on the swing member and the barrel-side connecting portion formed on the barrel is configured as a support shaft, and the other is configured as a bearing hole, By receiving the support shaft in the bearing hole, the swinging member is swingably connected to the shaft cylinder, By setting the size of the bearing hole larger than that of the support shaft, the swinging member can swing relative to the barrel while being connected to the barrel, 2. The knock-type writing implement according to claim 1, wherein the support shaft abuts against the periphery of the bearing hole, thereby restricting the swinging of the swinging member relative to the barrel.

3. a front barrel that is screwed onto the front end of the barrel; a connecting portion protruding forward from a tip portion of the barrel; a male thread portion formed on an outer peripheral surface of the connection portion; a female screw portion formed on an inner peripheral surface of the front barrel and threadedly engaged with the male screw portion; a rear step formed on a tip end surface of the connection portion; a front step formed on the tip side of the female screw portion of the front barrel and engaging with the rear step; The knock-type writing instrument according to claim 1 or 2, further comprising:

4. Further provided is a grip portion that covers the outer peripheral surface of the tip end side of the barrel, a leading edge of the grip portion is formed as an annular portion that annularly covers a rear end portion of the connection portion; The knock-type writing instrument according to claim 3 , wherein when the front barrel is screwed onto the connecting portion, the annular portion is sandwiched between the front barrel and the barrel tube.

Images