JP4145124B2 - Knock-type writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a knock type writing instrument having a feeding mechanism by a rotating cam that causes a writing tip portion of a writing body to protrude and retract from a tip opening portion of a shaft cylinder by pressing a knocking body to rotate the rotating cam.
[0002]
[Prior art]
[Patent Document 1]
"Japanese Patent Laid-Open No. 10-264585"
[Patent Document 2]
"Japanese Patent Laid-Open No. 10-278482"
[Patent Document 3]
"Japanese Patent Laid-Open No. 11-76361"
[Patent Document 2]
"JP 2000-127777"
[0003]
Conventionally, a knocking type writing instrument with a rotating cam provided with a feeding mechanism that causes the writing tip of the writing body to protrude and retract from the tip opening of the shaft cylinder by the action of the rotation of the rotating cam by pressing the knocking body is well known. Are known.
[0004]
Such a rotating cam mechanism is a mechanism that causes the writing tip of the writing body to protrude and retract from the tip opening of the shaft cylinder by engaging the protrusion of the rotating cam with the cam groove. Specifically, as shown in FIG. In addition, the cam groove K has a plurality of grooves (valley grooves T and recessed grooves M) having different lengths in the axial direction, and peaks (T1, T2) formed between the individual grooves are It has an inclined surface. When the knock body is pressed and the protruding portion 9a of the rotating cam is positioned in a trough T (short groove) formed by the step portion of the peak portion T1 and the peak portion T2, the writing tip portion of the cursive body protrudes and further knocks When the body is pressed, the projecting portion 9a moves over the mountain portion T2 and moves to the recessed groove M (long groove) along the inclined surface. In the state where the protrusion of the rotating cam is positioned in the recessed groove M, the writing tip of the writing body is immersed.
[0005]
By the way, when the knock type writing instrument is sandwiched between cloths such as pockets in a state where the writing tip of the writing body protrudes, the writing body particularly has a viscosity of 3000 mPa · s or less at 25 ° C. with water-based ink having low viscosity. In the case of a ballpoint pen refill containing oil-based ink or ink with shear thinning viscosity, there is a problem that the ink soaks into the fabric of the pocket and becomes dirty, and a release mechanism is provided in addition to the knocking body pressing operation. Therefore, a knock-type writing instrument that can easily immerse the writing tip is desired.
[0006]
In particular, it is preferable to provide a so-called safety mechanism in which the writing tip portion is immersed when a clip is attached to a pocket or the like, and many knock-type writing tools having a rotating cam equipped with such a safety mechanism have been proposed. The locking portion formed on the side is locked to the locking portion formed on the ball portion of the clip, and the locking state of the locking portion is released by the separation operation from the side surface of the shaft cylinder when the clip is clamped in the pocket. There is a known structure in which the rotating cam is retracted by an urging force of an elastic body or the like, and the writing body is also retracted in conjunction with the retraction of the rotating cam, so that the writing tip is immersed in the shaft cylinder. .
[0007]
[Problems to be solved by the invention]
However, the structure in which the engaging portion formed on the side surface of the rotating cam is engaged with the stopping portion formed on the ball portion of the clip has a problem in that it greatly affects the operation feeling when the knock body is pressed.
[0008]
Further, in Japanese Patent Laid-Open No. 2000-79789 “Knock-type writing instrument”, a cam cylinder having a locking projection that moves forward in conjunction with a pressing operation of the knock body and having a cam groove formed on the inner wall is attached to form a clip. A knock-type writing instrument is disclosed in which the knocking body is pushed and operated by pushing and pressing the knocking body while the locking protrusion is locked to the locking step.
[0009]
However, although the conventional “knock-type writing instrument” has little effect on the operation feeling when the knock body is pressed, once the locking projection locked to the clip is released, the knock body is once pressed to engage. After locking the locking projection on the stop portion, the writing tip of the writing body can be made to appear and disappear by pressing the knock body again.
[0010]
An object of the present invention is to provide a knock type writing instrument having a rotating cam that has a good operation feeling due to the pressing operation of the knock body and can be easily moved in and out in view of the above-described conventional problems. It is an object of the present invention to provide a knock type writing instrument having a safety mechanism that does not contaminate clothing even when the clip member is attached to clothing such as a pocket with the writing tip of the writing body protruding.
[0011]
[Means for Solving the Problems]
The present invention consists of a trough formed in a shaft cylinder, which is formed by forming two stepped portions adjacent to each other and forming a stepped portion, and a recessed groove that is longer in the axial direction than the trough. A cam groove in which a plurality of grooves having different lengths in the axial direction are alternately provided, a knock body provided with a cam portion at an end portion on the writing body side, and a pressing portion at the other end, and the knock body A rotating cam having a protrusion engaging with the cam groove, which moves back and forth while rotating along the cam groove by a pressing operation to the knock body, and a coil spring is attached to the rear end of the shaft cylinder. In a knock type writing instrument having a retracting mechanism by a rotating cam composed of a writing body that is biased and abutted against the rotating cam, a rotation stopper provided on the knock body is slidable on the shaft tube, and rotatably engaged to the rear of the rotating cam, the barrel rear end by the elastic member The cam groove forming member is disposed so as to be movable forward and backward by being biased in the direction, and the valley groove is formed by a first peak formed in the shaft cylinder and a second peak formed in the cam groove forming member. And a locking portion formed on the cam groove forming member is locked to a release member integrated with or attached to the shaft cylinder to restrict the back-and-forth movement of the cam groove forming member. When the locking portion is released from the release member in a state where the protrusion is locked, the elastic member causes the cam groove forming member to disappear until the second peak portion forms a valley groove. A second tip formed on the cam groove forming member is moved in the rear end direction of the shaft tube, and the writing tip is immersed , and the knock member is pressed in a state where the locking of the locking portion is released from the release member. And the release member and the locking portion are locked to move the cam. It regulates the longitudinal movement of the forming member to form a valley groove.
[0012]
Further, the release member is a clip member integrally or attached to a rear end of the shaft cylinder, the locking portion is locked to a locked portion formed on a ball portion of the clip member, and a writing tip portion is a tip end of the shaft tube. When the clip is clamped in a pocket or the like with the protruding portion of the rotating cam locked in the valley groove, the ball portion of the clip member is separated from the shaft tube by the pocket fabric or the like, and the locking And a safety mechanism for immersing the writing tip part by releasing the locking of the part and the locked part.
[0013]
In addition, the method of engaging the locking portion of the cam groove forming member with the release member in the present invention is not particularly limited, and has been conventionally known, such as by uneven engagement or engagement between a protrusion and a protrusion. A method of releasing the locking by the applied pressing or separation can be appropriately selected and used.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In addition, the same number is attached | subjected about the same member and the same component in drawing.
A knock type writing instrument 1 shown in FIGS. 1 to 11 has a structure in which a shaft cylinder is screwed between a front shaft 2 and a rear shaft 3 and a crown 6 is attached to a rear end portion of the rear shaft. A ballpoint pen refill using a ballpoint pen tip is accommodated in the writing front end portion 12 by being biased by the coil spring 13 in the direction of the rear end 6a of the head crown 6. The force of the coil spring 13 is the rotation cam 9 and the push rod 5. , Transmitted to the pressing body 4. The release member 10 attached to the rear shaft 3 is configured such that the locked portion 10a formed on the release member 10 enters the shaft tube from the window portion 3a provided on the rear shaft 3.
[0015]
FIG. 8 is a diagram showing a part of a development view of the cam groove forming member 7, the inner sheath 8, and the rotating cam 9, and shows the flow of the feeding mechanism by the rotating cam 9. In the order, the state returns to the state 8-8 again, and during this time, the movement of the writing tip 12 from the tip opening 2a of the front shaft 2 is performed once.
[0016]
Based on this, the feeding mechanism portion by the rotating cam 9 will be described. The knock body is formed by attaching the pressing body 4 to the push bar 5, and the knock body (press body 4, push bar 5) and the writing body 11. A cam groove forming member 7 and a rotating cam 9 are provided between the cam portion 5b of the push rod 5 and the corresponding rotating cam by pressing the knock body (pressing body 4, push rod 5). The force applied in the axial direction by the nine cam portions 9b is converted into a circumferential rotational force. At this time, the push bar 5 is provided with a rotation stopper 5a, and the crown 6 is formed with a window hole L corresponding to the rotation stopper 5a, so that the knock body (the pressure body 4, the push bar 5) Only the rotating cam 9 rotates in the circumferential direction by a predetermined angle without rotating in the direction.
[0017]
The cam groove K includes a first peak T1 formed on the inner wall surface of the inner sheath 8 and a cam groove arranged to be urged toward the rear end 6a of the head crown 6 by an elastic member 14 behind the rotary cam 9. A trough groove T and a recessed groove M are formed by connecting the second peak portion T2 formed on the forming member 7 to form a cam groove K for slidingly guiding the rotating cam 9 back and forth and rotating it. To do. At this time, the knock body (pressing body 4, push bar 5) is pressed in the direction of the front end opening 2 a of the front shaft 2, and the locking portion 7 a formed on the cam groove forming member 7 is released from the rear shaft 3. In a state of being locked to the locked portion 10a of the member 10, the first and second peak portions T1 and T2 are set to form the valley groove T.
[0018]
In the initial stage of the knock operation, the protrusion 9a of the rotary cam 9 is positioned in the recessed groove M and the rotation restriction is applied, and the rotary cam 9 does not rotate (FIGS. 8-1 and 8-2). As a result, the protrusion 9a of the rotating cam exceeds the first peak portion T1 and the rotation restriction is removed, and the rotating cam 9 rotates by a predetermined angle (FIGS. 8-3 and 8-4). Further, the rotating cam 9 is always urged rearward by the coil spring 13 through the writing body 11, and when the pressing of the knock body (pressing body 4, pressing bar 5) is stopped, the inclined surface of the first peak portion T1 The rotating cam 9 rotates by a predetermined angle, and the protruding portion 9a of the rotating cam moves to the trough T (FIG. 8-5). This state is a state in which the writing tip 12 protrudes from the tip opening 2 a of the front shaft 2 and the locking portion 7 a of the cam groove forming member 7 is locked to the locked portion 10 a of the release member 10.
[0019]
When the knocking body (pressing body 4 and push bar 5) is further pressed and the knocking operation is performed for a certain distance, the rotation cam protrusion 9a exceeds the second peak T2 and the rotation restriction is released, and the rotation cam 9 It rotates by a predetermined angle (FIGS. 8-6 and 8-7). At this time, the rotating cam 9 is always urged rearward by the coil spring 13 through the writing body 11, and when the knock body (pressing body 4, push bar 5) is stopped pressing, the inclined surface of the second peak portion T 2 The rotating cam 9 rotates by a predetermined angle, and the protruding portion 9a of the rotating cam moves to the recessed groove M (FIGS. 8-8, 8-9, 8-10). By this movement, the writing tip 12 is immersed from the tip opening 2 a of the front shaft 2.
[0020]
Further, the protruding portion 9a of the rotating cam is positioned in the valley groove T (FIG. 11-1) (the writing tip 12 protrudes from the tip opening 2a of the front shaft 2) and presses the release member 10 (see FIG. 11). 3 in the direction of arrow G), and when the locking of the locked portion 10a of the releasing member 10 and the locking portion 7a of the cam groove forming member 7 is released, the elastic member 14 causes the cam groove constituting member 7 to be It moves in the direction of the rear end 6a. By this movement, the step portion of the trough T formed by the first peak portion T1 and the second peak portion T2 disappears (FIGS. 11-2 and 11-3). As a result, the protrusion 9a of the rotating cam located in the trough T moves on the inclined surface of the second peak T2 (FIG. 11-4). By this movement, the rotary cam 9 is rotated by a predetermined angle, and the projecting portion 9a of the rotary cam is moved to the recessed groove M by the elastic force of the coil spring 13 (FIG. 11-5). It is immersed from the front end opening 2a of the front shaft 2.
[0021]
When the knock body (pressing body 4 and push bar 5) is further pressed and a knock operation is performed for a certain distance, the cam groove forming member 7 moves in the direction of the front end opening 2a of the front shaft 2 (FIGS. 11-6 and 11-). 7) Then, the locked portion 10a of the release member 10 and the locking portion 7a of the cam groove forming member 7 are locked. Thereafter, the pressing force of the knock body (pressing body 4 and push bar 5) is applied to the protrusion 9a of the rotating cam, the protrusion 9a of the rotating cam exceeds the first peak portion T1, the rotation restriction is released, and the rotating cam 9 It rotates by a predetermined angle (FIGS. 11-8 and 11-9). At this time, the rotary cam 9 is always urged rearward by the coil spring 13 through the writing body 11, and when the knock body (the pressing body 4, the pressing bar 5) is stopped, the inclined surface of the first peak portion T1. The rotating cam 9 rotates by a predetermined angle, and the protruding portion 9a of the rotating cam moves to the trough T (FIGS. 11-10 and 11-11). This state is a state in which the writing tip 12 protrudes from the tip opening 2 a of the front shaft 2.
[0022]
In the second embodiment shown in FIGS. 12 to 15, the release member 10 is a clip member 23 formed integrally with the head crown 22, and the locking portion of the cam groove forming member 7 is formed on the ball portion of the clip member 23. A knock type writing instrument 21 is obtained in the same manner as in the first embodiment except that a locked portion 23a for locking 7a is formed.
[0023]
In the knock type writing instrument 21, the clip member 23 is separated from the rear shaft 3 by the cloth of the pocket when the clip 23 is sandwiched between the cloth (not shown) of the pocket with the writing tip portion 12 protruding (see FIG. 15 arrow H direction). Due to this separation, the locking portion 7a of the cam groove forming member 7 that has been locked to the locked portion 23a of the clip member 23 is disengaged, and the shaft cylinder is moved by the resilient member 14 as in the first embodiment. The cam groove forming member 7 urged rearward moves in the direction of the rear end 22a of the crown 22 until there is no step portion of the valley groove T formed by the first peak portion T1 and the second peak portion T2 ( Fig. 11-3). As a result, the protrusion 9b of the rotating cam located in the trough T moves on the inclined surface of the second peak T2 (FIG. 11-4). By this movement, the rotating cam 9 is rotated by a predetermined angle, and the projecting portion 9b of the rotating cam is moved to the recessed groove M by the elastic force of the coil spring 13 (FIG. 11-5). Is immersed from the front end opening 2a of the front shaft 2. In other words, when the clip 23 is sandwiched between the pocket fabrics with the writing tip portion 12 protruding, the writing tip portion 12 is immersed and the pocket fabric is not soiled.
[0024]
In this embodiment, the shaft 2 is formed by screwing the front shaft 2 and the rear shaft 3, and the first peak portion T1 is formed on the inner sheath 8 disposed in the rear shaft 3. The inner sheath and the shaft tube may be integrally formed, and the first peak portion may be formed at the rear end portion of the shaft tube. Moreover, although the knock body is formed by mounting the pressing body 4 and the push rod 5, the pressing body 4 and the push rod 5 may be formed integrally.
[0025]
In this embodiment, a ballpoint pen refill is used as the cursive body, but the present invention is not limited to this. Also, the ballpoint pen tip structure is not particularly limited, and a structure in which the ball is pressed directly or via a pressing body at the tip of the coil spring, or a structure in which no coil spring is provided may be used. .
[0026]
In addition, the knock-type writing instrument of the present invention is not particularly limited in the ink contained in the cursive body, but is a water-based ink having a low viscosity, an oil-based ink having a viscosity of 3000 mPa · s or less at 25 ° C., or shearing. In the case of a ballpoint pen refill containing ink with reduced viscosity, it is particularly effective because the ink penetrates into the pocket fabric and is easily damaged.
[0027]
【The invention's effect】
As described above, the present invention can provide a knock type writing instrument having a rotating cam that can be easily moved in and out with a good operation feeling due to the pressing operation of the knock body.
[0028]
Moreover, the knock type writing instrument provided with the safety mechanism which does not stain clothes even if it attaches | wears with clothes, such as a pocket, in the state where the writing front-end | tip part of the writing body protruded was able to be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a knock type writing instrument according to a first embodiment.
FIG. 2 is a longitudinal sectional view of FIG. 1 with a writing tip portion protruding.
3 is an enlarged vertical cross-sectional view of a main part of FIG. 1 with a part omitted.
FIG. 4 is a longitudinal cross-sectional view in which a part of the main part partly omitted is developed in the first embodiment.
FIG. 5 is a cross-sectional view taken along the line AA in FIG.
6 is a cross-sectional view taken along the line BB in FIG.
FIG. 7 is a side view and a bottom view of a cam groove forming member.
FIG. 8 is a diagram illustrating a locking relationship between a cam groove and a protruding portion of a rotating cam in a retracting operation.
FIG. 9 is a longitudinal sectional view showing a state where the locking part and the locked part are released.
10 is an enlarged vertical cross-sectional view of a main part of FIG. 9 with a part omitted.
FIG. 11 is a diagram illustrating a locking relationship between a cam groove and a protruding portion of a rotating cam when releasing a locking portion and a locked portion.
FIG. 12 is a longitudinal sectional view showing a knock-type writing instrument according to a second embodiment.
13 is a longitudinal cross-sectional view of FIG. 12 with the writing tip portion protruding.
14 is an enlarged vertical cross-sectional view of a main part, partly omitted, in FIG. 12;
FIG. 15 is a longitudinal sectional view showing a state where the locking part and the locked part are released.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,21 Knock-type writing instrument 2 Front shaft 2a Front opening 3 Rear shaft 3a Window 4 Knock body 5 Push rod 5a Rotation stop 6 Head crown 6a Rear end 7 Cam groove forming member 7a Locking portion 8 Inner sheath 9 Rotating cam 9a Protruding portion 9b Cam portion 10 Release member 10a Locked portion 11 Writing body 12 Writing tip portion 13 Coil spring 14 Resilient member 22 Head crown 23 Clip member 23a Locked portion K Cam groove T1, T2 Mountain portion T Valley Groove M Recessed groove L Window hole

Claims (2)

Axial direction consisting of a valley groove formed by forming two stepped parts adjacent to each other and formed in a shaft cylinder, and a recessed groove that is longer in the axial direction than the valley groove. A cam groove in which a plurality of grooves having different lengths are alternately provided, a knock body provided with a cam portion at an end on the writing body side, and a pressing portion at the other end, and a cam portion of the knock body. And a rotating cam having a protrusion engaging with the cam groove, which moves back and forth while rotating along the cam groove by a pressing operation to the knock body, and is biased toward the rear end of the shaft cylinder by a coil spring. In a knock type writing instrument having a retracting mechanism by a rotating cam composed of a writing body abutting on the rotating cam, a rotation stopper provided on the knocking body is slidably and non-rotatably engaged with the shaft cylinder. combined, in the rear of the rotating cam, urges the barrel rear direction by the elastic member The cam groove forming member is disposed so as to be movable back and forth, and the valley is formed by the first peak formed in the shaft cylinder and the second peak formed in the cam groove forming member. A locking portion formed on the cam groove forming member is locked to a release member that is integrated with or attached to the shaft cylinder, restricts the back and forth movement of the cam groove forming member, and a protrusion of the rotary cam is engaged with the valley groove. When the locking portion is released from the release member in the stopped state, the cam groove forming member is moved by the elastic member until the stepped portion where the second peak portion forms a valley groove is eliminated. When the knocking body is pressed in a state where the writing tip is immersed and the locking portion is released from the release member, the second peak portion formed on the cam groove forming member is moved. The release member and the locking portion are locked by moving in the distal end direction of the shaft tube, and the cam groove forming member Knock-type writing instrument and forming a valley groove to regulate the back-and-forth movement. The release member is a clip member integrated with or attached to the rear end of the shaft cylinder, the locking portion is locked to a locked portion formed on a ball portion of the clip member, and the writing tip is an opening at the tip of the shaft cylinder. When the clip is clamped in a pocket or the like with the protruding portion of the rotating cam locked in the valley groove, the ball portion of the clip member is separated from the shaft tube by the pocket fabric or the like, and the locking portion and The knock-type writing instrument according to claim 1, further comprising a safety mechanism that releases the locking to the locked portion and immerses the writing tip portion.

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