JP2004167767A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retractable writing utensil, the functioning feel through the pressing functioning of a push button of which is favorable and which has a rotary cam allowing to easily retract and extend the writing tip part of a writing refill and preferably which is equipped with a safety mechanism. <P>SOLUTION: In the retractable writing utensil equipped with the retracting and extending mechanism of a writing refill by the rotary cam, at the rear of the rotary cam, a cam groove forming member is arranged turnably only towards its direction of rotation so as to form a dale groove out of a first crest part formed in the barrel and a second crest part formed in the cam groove forming member. When the engagement of an engaging part is released from a disengaging member under the condition that the projected part of the rotary cam engages with the dale groove, the projected part of the rotary cam presses the first or the second crest part by means of the engaging force of a coiled spring, resulting in rotating the cam groove forming member by means of the pressing force and consequently separating the first crest part and the second crest part forming the dale groove from each other so as to form a recessed groove between the first crest part and the second crest part in order to retract a writing tip part. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a knock-type writing implement provided with a feeding mechanism using a rotating cam that presses a knocking body to cause a writing tip of a writing body to protrude and retract from a tip end opening of a barrel by the action of rotation of a rotating cam.
[0002]
[Prior art]
[Patent Document 1]
"JP-A-10-264585"
[Patent Document 2]
"JP-A-10-278482"
[Patent Document 3]
"JP-A-11-76361"
[Patent Document 2]
"JP-A-2000-127677"
[0003]
2. Description of the Related Art Conventionally, a knock-type writing instrument using a rotary cam provided with a feeding mechanism that presses a knock body to cause a writing tip of a writing body to protrude and retract from a tip opening of a barrel by the action of rotation of a rotary cam is well known. Have been.
[0004]
Such a rotary cam mechanism is a mechanism that causes a writing tip of a writing body to protrude and retract from a tip opening of a shaft cylinder by engaging a projection of the rotary cam with a cam groove. Specifically, as shown in FIG. In the cam groove K, a plurality of grooves (valley grooves T, concave grooves M) having different lengths are alternately provided in the axial direction, and peaks (T1, T2) formed between the individual grooves are formed. It has an inclined surface. When the knock body is pressed, the writing tip of the writing body protrudes in a state where the protrusion 9a of the rotary cam is located in the valley groove T (short groove) formed by the step of the peak T1 and the peak T2. When the body is pressed, the protrusion 9a moves over the peak T2 and moves to the concave groove M (long groove) along the inclined surface. With the protrusion of the rotary cam positioned in the concave 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 with the writing tip of the writing body protruding, especially the writing body has a low viscosity water-based ink or a viscosity of 3000 mPa · s or less at 25 ° C. In the case of a ball-point pen refill containing oil-based ink, or ink provided with shear-thinning, there is a problem that the ink permeates and stains the fabric of the pocket, and a release mechanism is provided in addition to the pressing operation of the knock body. There is a long-felt need for a knock-type writing instrument in which the writing tip can be easily immersed.
[0006]
In particular, it is preferable to provide a so-called safety mechanism in which the writing tip is immersed when the clip is attached to a pocket or the like, and many knock-type writing instruments having a rotary cam having such a safety mechanism have been proposed. The locking portion formed on the side surface 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 separating the clip from the side surface of the shaft cylinder, such as when the clip is held in a pocket. There is known a structure in which a rotary cam is retracted by an urging force of an elastic body or the like, and a writing body is retracted in conjunction with the retraction of the rotary cam so that a writing tip portion is immersed in a shaft cylinder. .
[0007]
[Problems to be solved by the invention]
However, the above-described structure in which the locking portion formed on the side surface of the rotating cam is locked with the stopper formed on the ball portion of the clip has a problem that the operation feeling when pressing the knocking body is greatly affected.
[0008]
Also, in Japanese Patent Laid-Open No. 2000-79789 "knock-type writing implement", a cam cylinder having a cam groove having a cam groove formed on an inner wall is provided with a locking projection which advances in conjunction with a pressing operation of a knock body, and is formed into a clip. A knock-type writing instrument is disclosed in which a knocking body is pressed and operated to cause a writing tip of a writing body to protrude and retract in a state where the locking projection is locked to a locking step.
[0009]
However, although the conventional "knock-type writing instrument" has little effect on the operation feeling when pressing the knocking body, once the locking projection locked on the clip is released, the knocking body is once pressed to operate. After the locking projection is locked to the stop portion, the knocking body is pressed again to allow the writing tip of the writing body to appear and disappear.
[0010]
An object of the present invention is to provide a knock-type writing instrument having a rotary cam that has a good operation feeling by pressing operation of a knock body and that can easily come and go, in view of the above-described conventional problems. An object of the present invention is to provide a knock-type writing instrument provided with a safety mechanism that does not stain clothing even when a clip member is attached to clothing such as a pocket with the writing tip of the cursive body protruding.
[0011]
[Means for Solving the Problems]
According to the present invention, a valley groove formed by forming a stepped portion adjacent to two ridges having an inclined surface formed in a shaft cylinder, and a concave groove longer than the valley groove in the axial direction. A cam groove in which a plurality of grooves having different lengths in the axial direction are alternately provided, a cam body provided at the end on the writing body side, and a knock body provided with a pressing portion at the other end; 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 on the knock body, and a coil spring toward the rear end of the barrel. In a knock-type writing instrument having a retractable mechanism by a rotating cam constituted by a writing body which is urged and abuts on the rotating cam, a cam groove forming member is rotatable only in a rotating direction behind the rotating cam. The first ridge formed in the barrel and the cam groove forming member The valley groove is formed by the second peak portion, and a locking portion formed on the cam groove forming member is locked on a release member integrated with or attached to the shaft cylinder, and the cam groove locking member When the rotation is restricted and the locking of the locking portion is released from the release member in a state where the projection of the rotating cam is locked in the valley groove, the urging force of the coil spring causes the protrusion of the rotating cam to be released. Presses the first or second peak, rotates the cam groove forming member by the pressing force, the first and second peaks forming the valley groove are separated from each other, The recessed groove is formed between the first peak and the second peak, and the tip of the writing penetrates.
[0012]
Further, the locking member is a clip member integrally or attached to a rear end of the barrel, the locked portion is formed in a ball portion of the clip member, and a writing tip protrudes from an opening at a tip of the barrel. When the clip is clamped in a pocket or the like in this state, the ball portion of the clip member is separated from the barrel by the cloth of the pocket or the like, and the locking of the locking portion and the locked portion is released, and the writing tip is immersed. And a safety mechanism for causing the
[0013]
In addition, the method of engaging and disengaging the locking portion of the cam groove forming member with the release member in the present invention is not particularly limited, and it is possible to use a conventionally known pressing method such as a method using unevenness, a projection and a projection, and the like. A method of engaging and disengaging by separation can be appropriately selected and used.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same members and the same components are denoted by the same reference numerals.
The knock-type writing implement 1 shown in FIGS. 1 to 11 has a structure in which a barrel is formed by screwing a front shaft 2 and a rear shaft 3 together, and a cap 6 is attached to the rear end of the rear shaft. A ball-point pen refill using a ball-point pen tip is stored in the writing tip 12 by being urged toward the rear end 6a of the crown 6 by a coil spring 13 and the force of the coil spring 13 is applied to the rotary cam 9 and the push rod 5. , 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 inside of the shaft cylinder from the window 3a provided on the rear shaft 3.
[0015]
FIG. 8 is a view 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 a flow of a feeding mechanism by the rotating cam 9, and FIGS. Finally, the operation returns to the state 8-1 again, and during this time, the writing tip 12 comes out of the tip opening 2a of the front shaft 2 once.
[0016]
The knocking body is formed by attaching the pressing body 4 to the pushing rod 5 based on this, and the knocking body is formed by attaching the pressing body 4 to the pushing rod 5 and the knocking body (the pressing body 4 and the pushing rod 5) and the writing body 11. A cam groove forming member 7 and a rotary cam 9 are provided between them. By pressing a knocking body (pressing body 4 and push bar 5), a cam portion 5a of the push bar 5 and a corresponding rotary cam are pressed. The force applied in the axial direction by the cammed portion 9b is converted into a rotational force in the circumferential direction. At this time, the push rod 5 is provided with the rotation stopper 5a, and the window crown L corresponding to the rotation stopper 5a is formed in the crown 6 so that the knocking body (the pressing body 4, the pushing rod 5) rotates around. It is configured such that only the rotating cam 9 rotates by a predetermined angle in the circumferential direction without rotating in the direction.
[0017]
The cam groove K is formed on a first mountain portion T1 formed on the inner wall surface of the inner sheath 8 and a second mountain formed on a cam groove forming member 7 disposed behind the rotary cam 9 so as to be rotatable only in the radial direction. The valley groove T and the concave groove M are formed by connecting the portion T2 continuously, and constitute a cam groove K for slidingly guiding and rotating the rotary cam 9 back and forth. At this time, the knocking body (pressing body 4, push rod 5) is pressed in the direction of the front 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. The first and second two peaks T1 and T2 are set so as to form a valley groove T while being locked to the locked portion 10a of the member 10.
[0018]
In the initial stage of the knocking operation, the protrusion 9a of the rotary cam 9 is positioned in the concave groove M to perform rotation control, and the rotary cam 9 does not rotate (FIGS. 8A and 8B), but the knocking operation is performed for a fixed distance. When this is done, the protrusion 9a of the rotary cam goes beyond the first peak T1 and rotation is released, and the rotary cam 9 rotates by a predetermined angle (FIGS. 8-3 and 8-4). Further, the rotary cam 9 is always urged rearward by the coil spring 13 through the writing body 11, and when the pressing of the knocking body (the pressing body 4, the pressing rod 5) is stopped, the inclined surface of the first peak T1 causes The rotating cam 9 rotates by a predetermined angle, and the protrusion 9a of the rotating cam moves to the valley T (FIG. 8-5). In this state, 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 rod 5) is further pressed to perform a knocking operation for a fixed distance, the protrusion 9a of the rotary cam moves beyond the second peak T2 and the rotation restriction is released, and the rotary cam 9 is moved. Rotate by a predetermined angle (FIGS. 8-6 and 8-7). At this time, the rotating cam 9 is constantly urged backward by the coil spring 13 through the writing body 11, and when the pressing of the knocking body (the pressing body 4, the pressing rod 5) is stopped, the inclined surface of the second peak T2 is formed. Then, the rotating cam 9 rotates by a predetermined angle, and the protrusion 9a of the rotating cam moves to the concave groove M (FIGS. 8-8, 8-9, 8-10). By this movement, the writing tip 12 is immersed through the tip opening 2 a of the front shaft 2.
[0020]
Further, in a state where the protruding portion 9a of the rotary cam is located in the valley groove T (FIG. 12A) (a state in which the writing tip 12 protrudes from the tip opening 2a of the front shaft 2), the release member 10 is pressed (see FIG. 3 (in the direction of arrow G in FIG. 3), and when the locked portion 10a of the release member 10 and the locking portion 7a of the cam groove forming member 7 are released, the projection 9a of the rotating cam by the urging force of the coil spring 13 is released. Since the cam groove forming member 7 does not move in the axial direction, the pressing force pressing the second peak portion T2 is converted into a rotational force, and the cam groove forming member 7 rotates (FIGS. 12-2 and 12-3). I do. As a result, a concave groove M is formed between the first peak portion T1 and the second peak portion T2, and the projection 9a of the rotating cam is caused by the urging force of the coil spring 13 to move between the first peak portion T1 and the second peak portion T1. It moves to the newly formed concave groove M between the peaks T2 of FIG. 2 (FIG. 12-4). By this movement, the writing tip 12 is immersed through the tip opening 2 a of the front shaft 2. At this time, the locking portion 7a of the other cam groove forming member 7 is locked to the locked portion 10a of the release member 10.
[0021]
When the knocking body (pressing body 4 and push rod 5) is further pressed to perform a knocking operation for a fixed distance, the rotation cam 9 exceeds the first peak T1 and the rotation restriction is released, and the rotation cam 9 is moved to a predetermined position. Rotate by an angle (FIGS. 12-5, 12-6, 12-7). At this time, the rotary cam 9 is constantly urged backward by the coil spring 13 through the writing body 11, and when the pressing of the knocking body (the pressing body 4, the pressing rod 5) is stopped, the inclined surface of the first peak T1 is formed. Then, the rotating cam 9 rotates by a predetermined angle, and the protrusion 9a of the rotating cam moves to the valley groove T (FIG. 12-8). At this time, since the locking portion 7b of the other cam groove forming member 7 is locked to the locked portion of the release member 10, the rotation of the cam groove forming member 7 is restricted, so that the projection of the rotating cam is formed. 9a can maintain the state moved to the valley T. This state is a state in which the writing tip 12 protrudes from the tip opening 2 a of the front shaft 2.
[0022]
Further, in a state where the protruding portion 9a of the rotary cam is located in the valley groove T (FIG. 12-8) (a state in which the writing tip 12 protrudes from the tip opening 2a of the front shaft 2), the release member 10 is pressed (see FIG. 3 (in the direction of arrow G in FIG. 3), and when the locked portion 10a of the release member 10 and the locking portion 7a of the cam groove forming member 7 are released, the projection 9a of the rotating cam by the urging force of the coil spring 13 is released. Since the cam groove forming member 7 does not move in the axial direction, the pressing force for pressing the peak portion T1 is converted into a rotational force, and the cam groove forming member 7 is moved to the last time (FIGS. 12-2 and 12-3). ) In the opposite direction (FIGS. 12-9 and 12-10). As a result, a concave groove M is formed between the first peak portion T1 and the second peak portion T2, and the projection 9a of the rotating cam is caused by the urging force of the coil spring 13 to move between the first peak portion T1 and the second peak portion T1. It moves to the newly formed concave groove M between the peaks T2 (FIGS. 12-11 and 12-12). By this movement, the writing tip 12 is immersed through the tip opening 2 a of the front shaft 2. At this time, the locking portion 7a of the other cam groove forming member 7 is locked to the locked portion 10a of the release member 10.
[0023]
The second embodiment shown in FIGS. 12 to 15 is a clip member 23 in which the release member 10 is formed integrally with the crown 22, and a locking portion of the cam groove forming member 7 is provided on a 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.
[0024]
When the writing tip 12 is in a protruding state (FIG. 12-1 or 12-8), for example, when the clip 23 is clamped by a pocket cloth (not shown), the knock-type writing instrument 21 The member 23 is separated from the rear shaft 3 (the direction of the arrow H in FIG. 16). 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 can be rotated only in the radial direction as in the first embodiment. The cam groove forming member 7 is arranged such that the pressing force by which the projection 9a of the rotating cam presses the second peak T2 by the urging force of the coil spring 13 does not move the cam groove forming member in the axial direction. Therefore, it is converted into a rotational force, and the cam groove constituting member 7 rotates (FIGS. 12-2, 12-3 or 12-9, 12-10). As a result, a concave groove M is formed between the first peak portion T1 and the second peak portion T2, and the projection 9a of the rotating cam is caused by the urging force of the coil spring 13 to move between the first peak portion T1 and the second peak portion T1. It moves to the newly formed concave groove M between the peaks T2 (FIG. 12-4 or 12-12). By this movement, the writing tip 12 is immersed through the tip opening 2 a of the front shaft 2. In other words, when the clip 23 is held between the fabric of the pocket and the writing tip 12 in a protruding state, the writing tip 12 is immersed and the pocket fabric is not stained.
[0025]
In the present embodiment, the front shaft 2 and the rear shaft 3 are screwed to form a shaft cylinder, and the first sheath T1 is formed in the inner sheath 8 disposed inside the rear shaft 3. The inside of the rear shaft or the barrel may be integrally formed, and the first mountain portion may be formed at the rear end of the barrel. Further, although the knocking body is formed by attaching the pressing body 4 and the pushing bar 5, the pushing body 4 and the pushing bar 5 may be formed integrally.
[0026]
Further, in the present embodiment, a ballpoint pen refill is used as a cursive writing, but the present invention is not limited to this. Also, the ballpoint pen tip structure is not particularly limited, and the ball may be pressed directly at the tip of the coil spring or via a pressing body, or may be a structure without the coil spring. .
[0027]
Further, the knock-type writing instrument of the present invention is not particularly limited in the ink contained in the writing body, but is a low-viscosity water-based ink or an oil-based ink having a viscosity of 3000 mPa · s or less at 25 ° C. or shearing. In the case of a ball-point pen refill containing ink with reduced viscosity, the ink is particularly effective because it easily permeates into the fabric of the pocket and becomes soiled.
[0028]
【The invention's effect】
As described above, the present invention can provide a knock-type writing instrument having a rotating cam that has a good operating feeling by the pressing operation of the knocking body and can easily be moved in and out by the above-described configuration.
[0029]
In addition, a knock-type writing instrument provided with a safety mechanism that does not stain clothing even when the clip member is attached to clothing such as a pocket with the writing tip of the writing body protruding can 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 in a protruding state.
FIG. 3 is an enlarged longitudinal sectional view of a main part in FIG. 1 with a part omitted.
FIG. 4 is a longitudinal sectional view in which main parts, which are partially omitted, in the first embodiment are developed.
FIG. 5 is a sectional view taken along line AA in FIG. 1;
FIG. 6 is a sectional view taken along line BB in FIG. 1;
FIG. 7 is a top view, a side view, and a bottom view of the cam groove forming member.
FIG. 8 is a diagram illustrating a locking relationship between a cam groove and a projection of a rotating cam in a retracting operation.
FIG. 9 is a longitudinal sectional view showing a state in which a locking portion and a locked portion are released.
FIG. 10 is an enlarged longitudinal sectional view of a main part of FIG. 9, with some parts omitted.
11 is a sectional view taken along the line CC in FIG. 9;
FIG. 12 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. 13 is a longitudinal sectional view showing a knock type writing instrument according to the second embodiment.
FIG. 14 is a longitudinal sectional view of FIG. 13 with a writing tip protruding.
FIG. 15 is an enlarged longitudinal sectional view of a main part in FIG. 13 with a part omitted.
FIG. 16 is a vertical cross-sectional view showing a state where a locking portion and a locked portion are released.
[Explanation of symbols]
1, 21 Knock-type writing implement 2 Front shaft 2a Tip opening 3 Rear shaft 3a Window 4 Knock body 5 Push rod 5a Rotation stop 6 Crown 6a Rear end 7 Cam groove component 7a Locking portion 8 Inner sheath 9 Rotating cam 9a Protrusion 9b Cammed portion 10 Release member 10a Locked portion 11 Writing body 12 Writing tip 13 Coil spring 22 Crown 23 Clip member 23a Locked portion K Cam groove T1, T2 Crest T Valley groove M Recessed groove L window hole

Claims (2)

An axial direction comprising a valley groove formed by forming two shoulders adjacent to each other and having a slope formed in the shaft cylinder and forming a step, and a concave groove 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 knocking body having a cam portion at the end on the writing body side, and a pressing portion at the other end, and a cam portion of the knocking body. A rotating cam having a projection engaging with the cam groove, which moves back and forth while rotating along the cam groove by a pressing operation on the knocking body, and is urged toward the rear end of the barrel by a coil spring. In a knock-type writing implement having a retractable mechanism by a rotating cam constituted by a writing body abutting on the rotating cam, a cam groove forming member is disposed behind the rotating cam so as to be rotatable only in the rotating direction, A first crest formed in the cylinder, and a second crest formed in the cam groove forming member Thereby, while forming the valley groove, the locking portion formed in the cam groove forming member is locked to a release member integrated or attached to the shaft cylinder, and regulates the rotation of the cam groove locking member, When the lock of the locking portion is released from the release member in a state where the protrusion of the rotary cam is locked in the valley groove, the protrusion of the rotary cam causes the first or second protrusion by the urging force of the coil spring. Is pressed, the cam groove forming member is rotated by the pressing force, the first peak and the second peak forming the valley groove are separated from each other, and the first peak and the second peak are separated. A knock-type writing instrument, wherein the recessed groove is formed between the two peaks, and the writing tip is immersed. The release member is a clip member integrally or attached to a rear end of the barrel, the locking portion is locked to a locked portion formed on a ball portion of the clip member, and a writing tip is an opening at a tip of the barrel. When the clip is clamped in a pocket or the like in a state where the protrusion of the rotating cam is locked in the valley groove, the ball portion of the clip member is separated from the shaft cylinder by a cloth or the like of the pocket, 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.

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