JP2004167766A - 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 not causing to soil the clothes of a user even under the condition that a clipping member lying under the state that the writing tip part of the writing refill is extended is installed in the clothes such as a pocket. <P>SOLUTION: In the retractable writing utensil equipped with a retracting and extending mechanism by the rotary cam, at the rear of the rotary cam, a cam groove forming member is arranged movably back and forth by being energized towards the rear end of a barrel with an elastic member 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 cam groove forming member is shifted by the elastic member towards the rear end of the barrel to its portion, at which a stepped part for forming the dale groove by the second crest part disappears, resulting in retracting the 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]
Conventionally, by pressing a knocking body, a knocking-type writing implement by a rotating cam having a feeding mechanism that causes a writing tip of a writing body tip to protrude and retract from a tip opening of a barrel by the action of rotation of a rotating cam is often used. Are known.
[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 provided with a retractable mechanism by a rotating cam constituted by a writing body which is urged and comes into contact with the rotating cam, a biasing member is urged rearward of the rotating cam toward a rear end of the barrel. A cam groove forming member disposed so as to be movable back and forth, and a first mountain formed in the shaft cylinder. And the second crest formed on the cam groove forming member forms the valley groove, and the locking portion formed on the cam groove forming member is locked on a release member integrated with or attached to the shaft cylinder, When the locking of the locking portion is released from the release member with the protrusion of the rotary cam locked in the valley groove while controlling the longitudinal movement of the cam groove locking member, the cam groove is released by the elastic member. The forming member moves toward the rear end of the barrel until there is no step where the second peak forms a valley groove, and the writing tip is immersed.
[0012]
Further, 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 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 cloth or the like in the pocket, and the locking is performed. And a safety mechanism for releasing the locking of the writing portion and the locked portion to immerse the writing tip.
[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 there are conventionally known methods such as engagement by concave and convex engagement and engagement between protrusions. It is possible to appropriately select and use a method in which the locking is released by the pressing or the separation being performed.
[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. The force of the coil spring 13 is applied to the rotating cam 9, the push rod 5 and the like. , 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 order returns to the state of 8-8, and during this time, the operation of the writing tip 12 coming out of the tip opening 2a of the front shaft 2 is performed 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 by a first mountain portion T1 formed on the inner wall surface of the inner sheath 8 and a cam groove disposed behind the rotary cam 9 by being biased toward the rear end 6a of the crown 6 by an elastic member 14. A valley groove T and a concave groove M are formed by connecting the second peak portion T2 formed on the forming member 7 continuously, and a cam groove K for slidingly guiding and rotating the rotary cam 9 back and forth is configured. I do. 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 rotating cam 9 is constantly 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 rotary cam 9 is constantly urged backward by the coil spring 13 through the writing body 11 and when the knocking body (the pressing body 4 and the pressing rod 5) is stopped from being pressed, 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]
In a state where the protrusion 9a of the rotary cam is located in the valley groove T (FIG. 11A) (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. 11). (In the direction of arrow G in FIG. 3), and when the locking between the locked portion 10a of the release member 10 and the locking portion 7a of the cam groove forming member 7 is released, the cam groove forming member 7 is It moves in the direction of the rear end 6a. By this movement, the step portion of the valley groove 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 rotary cam located in the valley T moves on the inclined surface of the second peak T2 (FIG. 11-4). By this movement, the rotary cam 9 rotates by a predetermined angle, and furthermore, the projection 9a of the rotary cam moves to the concave groove M by the resilient force of the coil spring 13 (FIG. 11-5), and the writing tip 12 is moved. It is immersed in the front end opening 2a of the front shaft 2.
[0021]
When the knock body (press body 4 and push bar 5) is further pressed to perform a knock operation for a fixed distance, the cam groove forming member 7 moves in the direction of the tip 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 knocking body (the pressing body 4 and the push rod 5) is applied to the projection 9a of the rotating cam, the projection 9a of the rotating cam exceeds the first peak T1, and the rotation is restricted, and the rotation cam 9 is released. It rotates by a predetermined angle (FIGS. 11-8 and 11-9). At this time, the rotating cam 9 is constantly urged backward by the coil spring 13 through the writing body 11 and when the knocking body (the pressing body 4 and the pressing rod 5) is stopped from being pressed, the inclined surface of the first peak T1 is formed. The rotating cam 9 rotates by a predetermined angle, and the protrusion 9a of the rotating cam moves to the valley T (FIGS. 11-10 and 11-11). In this state, the writing tip 12 protrudes from the tip opening 2a of the front shaft 2.
[0022]
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.
[0023]
In the knock-type writing instrument 21, for example, when the writing tip 12 is in a protruding state and the clip 23 is clamped by a pocket cloth (not shown), the clip member 23 is separated from the rear shaft 3 by the pocket cloth (see FIG. 15 arrow H direction). Due to this separation, the locking portion 7a of the cam groove forming member 7 which has been locked to the locked portion 23a of the clip member 23 is released, and the resilient member 14 causes the shaft cylinder to be released similarly to the first embodiment. The cam groove component 7 urged rearward moves toward the rear end 22a of the crown 22 until the step of the valley groove T formed by the first peak T1 and the second peak T2 disappears. FIG. 11-3). As a result, the protrusion 9b of the rotary cam located in the valley T moves on the inclined surface of the second peak T2 (FIG. 11-4). By this movement, the rotating cam 9 rotates by a predetermined angle, and furthermore, the resilient force of the coil spring 13 causes the protrusion 9b of the rotating cam to move to the concave groove M (FIG. 11-5), and the writing tip 12 Is immersed through the front end 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.
[0024]
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.
[0025]
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. .
[0026]
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.
[0027]
【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.
[0028]
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 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.
FIG. 11 is a diagram illustrating a locking relationship between a cam groove and a projection of a rotating cam when a locking portion and a locked portion are released.
FIG. 12 is a longitudinal sectional view showing a knock-type writing instrument according to the second embodiment.
FIG. 13 is a longitudinal sectional view of FIG. 12 with a writing tip protruding.
FIG. 14 is an enlarged longitudinal sectional view of a main part of FIG. 12, with some parts omitted.
FIG. 15 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 14 Resilient member 22 Crown 23 Clip member 23a Locked portion K Cam groove T1, T2 Peak 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 contacting the rotating cam, the knocking-type writing implement is moved forward and backward by being biased toward the rear end of the barrel by a resilient member behind the rotating cam. A first groove portion formed in the shaft cylinder, and a cam groove forming member, The second crest formed on the groove forming member forms the valley groove, and the 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 is formed. When the locking member is restricted from moving forward and backward, and the locking member is released from the release member in a state where the protrusion of the rotary cam is locked in the valley groove, the cam groove forming member is formed by the elastic member. A knock-type writing instrument wherein the second peak moves toward the rear end of the barrel until there is no step forming a valley groove, 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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