JP2000071681A - Dual writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knock dual writing instrument having good performance of a low cost without sacrificing assemblage and an appearance by incorporating a safety mechanism for eliminating staining of clothes caused by a nib remained output or piercing into a human body in the case of inserting a conventional knock dual writing instrument into the clothes. SOLUTION: In the dual writing instrument comprising a plurality of refills contained therein, knock bars at a rear end side to be sequentially pressed to project or retract a nib; when a ball locking part 4 of a clip 5 is locked to a locking protrusion 8 of an intermediate barrel, the overall writing instrument length is shortened for writing or projecting or retracting the refill, and in the state that the locking is unlocked, even when the bars 7 (7a, 7b) are pressed, the state that the nib is not projected from the long overall length to provide a safety mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called knock-type writing instrument in which a refill, which is a writing body, is protruded for writing by pressing a knock bar at the rear end. This is a knock-type writing implement with an improved safety mechanism that does not stain clothes or pierce the human body because the refill is stored when the lock with the locking projection protruding off the shaft is released. Yes,
In particular, aiming to realize a safety mechanism with a double writing instrument that stores multiple refills inside, and a knock double ballpoint pen that aims to realize inexpensive operation reliability and operability without deteriorating the appearance. Regarding improvement.

[0002]

2. Description of the Related Art A safety mechanism is equipped with a knock-type writing instrument that can repeatedly repeat protrusion and storage of a refill simply by repeatedly pressing a knock bar, which is easy and excellent in operability in the existing operability. In the case of a single cursive type, various inventions have been devised, but if there are multiple built-in refills, a single knocking writing instrument with a safety that has a safety mechanism corresponding to multiple refills with one clip Not invented.

[0003] In a double-type writing instrument having a plurality of cursives,
Especially because the contents are tightly packed in the shaft, the space for the mechanism is small, and no mechanism has been devised to realize the safety operation with multiple cursives.
It is not easy to realize with many refills with more than this number, and equipped with multiple knock-type refills such as recently developed neutral ballpoint pen, batting type water-based ballpoint pen and ballpoint pen with extra fine nib The product is not commercially available.

[0004] From the past, a double knock mechanism with a pen point storing type using a mechanical pencil, a safety mechanism using a clip with a batting-type aqueous ballpoint pen, and a knock-type medium-viscosity gel ink ball-point pen in recent years by the present inventors and applicants. Safety mechanisms have been invented,
Until now, most of the inventions have only one refill, and in the case of a compound writing instrument having two or more refills in a shaft, especially a knock compound writing instrument which is advantageous in terms of operational stability, operation feeling, cost and appearance. A safety mechanism was desired, but when the shaft diameter became large or the operation was unstable,
There were no good writing instruments.

[0005] In a capless knock-type ballpoint pen that does not require the removal of the cap, the front end surface of the shaft is open, and the structure is such that the refill is projected by pressing the knock bar and writing is performed. If you forget to store the refill when storing it in the printer, the refill will remain protruding off the axis, and there will be accidents that stain the pockets with ink, and use a sharp pencil or a thin pipe-shaped nib. Ballpoint pens that have a pen tip that uses a very thin core or pen tip part of φ1 or less and generally around φ0.5, such as breaking the clothes or sticking to the human body if the pen tip is protruding Accidents have also occurred, and recently there has been an increasing demand for products that emphasize safety.

In order to solve these problems, for example, in Japanese Utility Model Publication No. 1-1115593, Japanese Utility Model Publication No. 3-35591 or the like, the locking ball of the clip and the projection inside the shaft are locked so that the writing tool must be refilled when the writing instrument is inserted into the pocket. There have been proposed various designs of a structure for accommodating a screw, and a design of providing a window on a shaft and a locking portion on a ball portion of a clip to perform the same operation.

However, these methods are expensive and have problems in assemblability due to the necessity of working the window and the locking portion of the metal clip and the need for a separate metal spring material. Since the clip is lifted every time it is taken in and out, there are disadvantages such as making the clip expensive and highly durable, sacrificing the durability of the spring of the clip, and increasing the number of parts.

In the knock type safety mechanism, after the refill is projected by pressing the knock bar, when storing the clip, the rear end of the clip is pushed to lift the clip ball portion to release the locking and refill. Is often adopted, but in this case, the spring-applied portion of the clip has a strong spring property in consideration of the durability of repeated locking and releasing, so it is necessary to release it. It is difficult to set a load that is easy to use because the required force is required, and especially when a refill with different operability such as a mechanical pencil and a direct liquid type refill with a mechanical pencil is installed, sharp There is a problem that in addition to the knock stroke for safety, it is necessary to secure a stroke for centering in order to extend the pencil lead. To have.

[0009]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve a general-purpose dual-purpose writing instrument, and to smoothly operate a refill in a projecting operation and a storing operation, and without alienating writing. Prevents accidents such as soiling or sticking of clothes when stored in pockets, and a mechanism that makes it easy to protrude and store refills. It is also desired to solve the problem of assembly and assembly.

[0010] Even if the clip is made of resin, it is possible to secure the operation with a weak spring while maintaining the durability by allowing the pen tip to be taken in and out other than by lifting the clip. To solve the problem of providing a dual-purpose writing instrument with safety that satisfies the desire to have a configuration that can guarantee a comfortable and reliable operation and the desire to implement a safety mechanism with multiple refills using a simple mechanism. That is the object of the present invention.

[0011]

In order to achieve the above-mentioned object, a knock type writing instrument according to the present invention comprises a plurality of refills 18-a, b, c, d each having a writing portion at the tip (hereinafter, unless otherwise specified). The abcd symbol is omitted), and a knock bar 7 that urges it rearward and a knock bar 7 that projects from the outer diameter (or rear end) of the rear shaft 1 in conjunction with the refill 18 is provided for each. The knock bar 7 is pressed to cause the refill 18 to protrude from the front end hole 11 of the front shaft 10, so that the rear end 20 of the knock bar 7 is locked to the window locking end 3 of the rear shaft 1. In this case, writing becomes possible, and the urging force of the spring 19 that constantly urges the refill 18 rearward by pressing any one of the knock bars 7 other than the protruding one, and the rear projection 21 inside the knock bar 7. And the front projection 22 Therefore employs a general multi-color dual knock mechanism a new refill 18 towards the refill 18 engaging stood out is released and then pressed either accommodated protrudes as a mechanism of the basic operation.

As a characteristic means of the present invention, there is provided a rear shaft 1 which is generally provided inside the front end of a clip 5 which is attached to the rear shaft 1 so as to be non-rotatably or integrally provided. A ball engaging portion 4 is provided on a ball portion having an R so that the writing implement is fixed in a pocket or the like by sandwiching clothes between the clips 5 and is easily inserted and removed, and is fixed or integrated with a central shaft 9 to which a front shaft 10 is screwed. By locking the locking projections 8 provided on the rim with the off-axis ball locking portions 4, the refill 18 can be projected.

In order to satisfy the above configuration, the rear shaft 1
The portion corresponding to the periphery of the tip of the clip 5
A long window 6 is provided so as to be able to move back and forth while projecting off the axis, and a locking projection 8 moves in the long window 6.

When the locking projection 8 and the ball locking portion 4 are locked by pressing the rear shaft 1 or the clip 5, the total length of the writing implement is short, and the knock bar 7 State that the refill 18 is protruded by the pressing of
Press another knock bar 7 to store or another refill 18
Can be projected.

When the ball locking portion 4 and the locking projection 8 are not locked, the urging force of the spring 19 for returning the refill 18 is applied, and as a result, the writing tool has a long overall length. Even if only the knock bar 7 is pressed to make the pen tip protrude, the pen tip is housed inside the tip shaft 10 so that the safety mechanism does not stain clothes or pierce the human body. Is realized.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 8 show an embodiment of the present invention, and FIG. 9 shows a conventional example. First, a first embodiment of the present invention will be described in detail below.
As shown in the drawing, the writing implement of the present invention includes a writing tool such as a ballpoint pen refill for storing ink 36 in a tube 35, a mechanical pencil unit refill (not shown in detail), an eraser unit refill (not shown in detail), and the like. This is a compound writing instrument having at least two or more refills 18 in combinations of different types, different colors, different thicknesses, and correction tools.

At least one or more of the refills 18 may stain the clothes because the ink inside easily leaks out, may penetrate and break the clothes because the pen tip is smaller than φ1, or may easily penetrate the human body. To do
It is a refill where a safety mechanism is desired.

An aqueous solution having a built-in ink having a viscosity lower than that of a general oil-based ball-point pen and imparting a shear thinning property called neutral or pseudoplastic has a viscosity at room temperature of 20 to 4000.
A so-called neutral ballpoint pen with a built-in grease-like follower 37 that hardly volatilizes directly behind the ink 36 having a viscosity of mPa〓S and the refill 18, or a batting with a viscosity of 2 to 20 mP
Aqueous ballpoint pens that hold low viscosity ink of a〓S and lead out to the pen tip with an ink guide core, and 200 to 4000 mPa〓S, which is lower than the ink viscosity of ordinary oil-based ballpoint pens of around 10,000 mPa〓S At least one or more refills 18 such as a ballpoint pen containing low-viscosity oil-based ink, a correction liquid, and the like, which have a structure in which ink easily leaks from the pen tip or is easily pulled out when coming into contact with clothes. Book Refill 18
The present invention can be effectively used in a writing instrument having embedded therein.

In this double-type writing instrument, a refill 18 having a writing portion at the tip and a spring 1 for urging the refill 18 rearward.
9 and a knock bar 7 which comes into contact with the rear end surface of the refill 18 and projects from the knock window 2 of the rear shaft 1 in the radial direction or from the axial rear end of the rear shaft 1. By pressing the refill 18-a, the front end inner hole 1 of the front shaft 10 is pressed.
1, the rear end 20-a of the knock bar 7-a is locked to the window locking end 3 provided on the knock window 2 of the rear shaft 1, thereby maintaining the protruding state and allowing writing. Becomes

When writing another refill 18-b or storing the already protruding refill 18-a, knock bars 7-a other than the knock bar 7-a operating in conjunction with the protruding refill 18-a. b, the front projection 22-b provided inside the knock bar 7-b lifts the rear projection 21-a of the knock bar 7-a, and the window locking end 3
And the rear end 20-a of the knock bar is disengaged and refill 1
8-a is stored. When the knock bar 7-b is further pressed (pressed strongly to the pen tip side from the beginning), the rear end 20-b of the knock bar is locked by the window locking end 3, and the refill 18-b is maintained in a protruding state. The same applies to refills other than 18-b.

The knock bar 7 has a knock bar step 23 for receiving a refill or a spring, and a refill insert having a protrusion or groove ventilation groove 12 for securing ventilation of the refill 18 at its tip end. The refill 18 is fixed so that the refill 18 can be inserted and removed at the time of refill replacement by the part 24. Usually, the knock bar 7 and the refill 18 operate in conjunction with each other, and the refill 18 does not come off from the knock bar 7 until the drop impact. It is.

The front shaft 10 has an inner hole 11 at the front end where a refill 18 protrudes and retracts, and a front screw 15 at the rear end.
The center shaft 9 is normally fixed by screwing or under-cutting with a center screw 14 so that the front shaft 10 can be removed when the refill 18 is replaced. The center shaft 9 is provided with a hole 17 through which a refill 18 can penetrate. The knock bar 7 is set on the rear shaft 1, and the previously described refill 18 is inserted and fixed to the knock bar 7 with the center shaft 9 and the spring 19 interposed therebetween. I do.

The rear shaft 1 is integrally provided with a clip 5 protruding outward from the vicinity of the rear end.
A hook-shaped ball engaging portion 4 is provided at a position where a hemispherical projection generally called a clip ball is provided at a position corresponding to the rear outer surface on the distal end side of the device. The rear shaft 1 is provided with a long window 6 penetrating therethrough around the ball locking portion 4.

The center shaft 9 is provided with a locking projection 8, and when the center shaft 9 and the rear shaft 1 are press-fitted, the locking projection 8 is elastically deformed and elastically restored from the long window 6 of the rear shaft 1. It becomes impossible to pull it out, and here the long window 6 is
The rear shaft 1 and the center shaft 9 are dimensioned so as to be able to move only in the front and rear directions, and the locking projections 8 of the center shaft 9 are provided with slits 16 so as to be easily elastically deformed. Providing the parts facilitates the assembling work.

The present invention is characterized in that the above-described ball locking portion 4 of the clip 5 and the locking projection 8 of the center shaft 9 can be locked, and the rear shaft 1 is held by holding the front shaft 10. When pressed, the overall length of the shaft becomes shorter, and when the ball locking part 4 and the locking projection 8 are locked, the state where the total length is short is maintained even when the hand is released,
In this state, the clothes need to pass between the locking ball 4 and the locking projection 8 in order to be inserted into the clothes, so that the locking is released naturally, and the entire length of the writing implement is reduced by the urging force of the internal spring 19. It will be long.

That is, in the writing instrument of the present invention, the gap S between the rear shaft 1 and the center shaft 9 screwed to the front shaft 10 is large.
In this state, the total length of the writing implement is long. In this state, even when the knock bar 7 is operated to protrude the refill 18, the pen tip does not come out from the inner hole 11 of the front shaft 10 as shown in FIG. When the clearance M between the center shaft 9 and the center shaft 9 is small, the total length of the writing instrument is short. In this state, when the knock bar 7 is operated to protrude the refill 18, the front shaft 10
The pen mechanism has a dimensional configuration as shown in FIG.

FIG. 5 shows a state in which the refill 18-d, which is a unit of the mechanical pencil, protrudes. When the clip 5 is lifted and the refill 18-d is stored, the rear shaft 1 is simply pressed next. As soon as the refill 18-d mechanical pencil can be used,
When the lead is further consumed and the lead is further extended, the rear shaft 1 can be knocked a required number of times in the same manner as in a normal mechanical use of a mechanical pencil.

As a second embodiment of the present invention, the clip 5 is attached separately to the rear shaft 1 or the clip 5 and the knock bar 7 for refilling the mechanical pencil are integrally formed. It is conceivable that it is separate from the above. In particular, since the clip is required to have a function that can be sufficiently elastically deformed and does not settle even when repeatedly lifted, it is preferable that the clip is made of engineering plastics such as polycarbonate, polyacetal, and polybutylene terephthalate. The center shaft 9 and the rear shaft 1 can be smoothly moved back and forth and have sufficient pull-out strength, so that they are almost the same as the locking projections 8 of the center shaft 9, but have a low height and an outer diameter of the rear shaft 1. A stable product can be obtained by providing a stopper 25 which is equal to or less than the above.

As a third embodiment, at least one of the built-in refills 18 has a viscosity at room temperature of 2 mPa〓.
The present invention is effective when the ink has a viscosity of 4,000 mPa〓s to 4,000 mPa〓s or contains a low-viscosity ink. The neutral ballpoint pen shown in FIG. 8 will be described in detail. 26 is rotatably fitted to the holder 28 in a state in which it is exposed to the outside. Inside the holder 28 is prevented from fogging due to air entrapment from the pen tip side due to vibration, and direct current leaking ink from the pen tip. A tip spring 27 with a load of 2 to 80 g is built in for the purpose of preventing or preventing volatilization from the pen tip. Further, between the ink container tube 36 behind the holder 28 and the joint 29 for press-fitting and holding the container tube 36, a check ball 33 is provided.
And a valve seat 31, an ink guide groove 30, and an ink guide hole 32 to prevent backflow and reduce knock impact.

As a fourth embodiment, at least one of the built-in refills is a mechanical pencil or a pipe-shaped ball-point pen having a tip of φ1 or less, at which the writing portion at the tip may pierce the human body or clothes. It is the same as the one described in detail in the description of the first embodiment of the mechanical pencil, as long as it has a refill tip shape that is easy to tear clothes, pierce the human body, and so on. The configuration of the present invention is effective.

[0031]

The operation of the present invention will be described in an embodiment. In a knock-type ballpoint pen in which writing can be performed by pressing a knock bar protruding rearward from the shaft so that the refill, which is a writing body, protrudes from the tip of the shaft, the locking portion of the center shaft and the ball locking portion are engaged. Stops the refill to keep the protruding state of the refill, so when the ball locking part integrated with the clip is lifted, the lock is released and the refill is automatically stored, so put it in the pocket and stain the clothes It is possible to prevent accidents in which the pen tip is stuck.

Since the clip is lifted only when it is naturally lifted only when it is put on clothes, the frequency of repetition is considerably less than that of the conventional pen tip which is operated only by the clip, and the pressing of the clip portion is lighter than the conventional one. Since the pressure can be set, the operability can be improved, and it can be molded integrally with the rear shaft, making it possible to use a slim writing tool such as eliminating the need for special spring parts. The appearance is unique and mechanic.

Further, since the projecting and storing operations are repeated only by the operation of the knock bar, the user does not need to explain special operations, thereby improving not only the operability but also the medium-viscosity refill which has been impossible in the past. The present invention has the greatest effect that a plurality of refills including the above can be mounted.

It is possible to make one or more of the refills a refill of a mechanical pencil without adding any special parts or configuration as in the embodiment of the present invention, so that the design has a very wide application range. In addition to the above-described operation, the present invention has an operation capable of providing a safety dual-type writing instrument without increasing the cost because it has substantially the same component configuration and assembling property as the conventional knock multiple-type writing instrument.

[0035]

The structure and operation of the knock-type writing instrument according to the present invention are as described above. A writing instrument having a slim appearance and an appearance differentiated from the others is provided, and the clothes are stained and harm to the human body is provided. It is possible to provide an easy-to-use writing instrument that not only satisfies the function of a highly secure knock-type writing instrument that has an effect of not causing a serious accident such as addition, but also can be used easily by a user.

Further, the present invention has the effect of being able to provide only a low-cost dual writing instrument having a safety mechanism which is not commercially available at present, and it is possible to use four colors with a single writing instrument or to use a pencil and an eraser. It has an effective effect of providing a single type of handwriting frequently used in office work, such as red and black ballpoint pens.

Further, it is possible to reduce the influence of the creep phenomenon of the clip, and since the knocking mechanism with good operability can use the conventional parts as it is, no functional problem such as the problem of operation reliability occurs. . Not only can the component configuration be simplified, but also a stable product that is inexpensive, has good functionality, and has long-term durability can be provided. In addition, it is possible to provide a satisfactory knock double-type writing instrument that is easy to operate in the insertion / removal of the pocket and the knocking operation and that is inexpensive.

[Brief description of the drawings]

FIG. 1 is an external view showing an entire writing implement according to an embodiment of the present invention.

FIG. 2 is an external view showing internal components of a writing instrument according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing the writing instrument according to the embodiment of the present invention when it is stored.

FIG. 4 is a longitudinal sectional view showing a safety state of the writing instrument according to the embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a writable state of the writing instrument according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing the rear shaft knock portion of the writing instrument according to the embodiment of the present invention in a writable state.

FIG. 7 is a cross-sectional view showing a rear shaft knock portion in a state in which the writing instrument according to the embodiment of the present invention can be stored.

FIG. 8 is a longitudinal sectional view of a neutral ballpoint pen mounted on a writing instrument according to an embodiment of the present invention.

FIG. 9 is an external view showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rear shaft 2 knock window 3 window locking end 4 ball locking portion 5 clip 6 long window 7 knock bar 8 locking protrusion 9 middle shaft 10 front shaft 11 tip inner hole 12 air hole 13 stepped portion 14 middle shaft screw 15 front screw Reference Signs List 16 slit 17 refill hole 18 refill 19 spring 20 knock bar rear end 21 rear protrusion 22 front protrusion 23 knock bar step portion 24 refill insertion portion 25 retaining 26 writing ball 27 chip spring 28 holder 29 joint 30 ink groove 31 valve seat 32 guide Hole 33 Check ball 34 Press-fit part 35 Storage tube 36 Ink 37 Follower

Claims (4)

[Claims] 1. A rifle having two or more writing bodies having a writing portion at a tip, a spring for urging the rifle rearward, and a knock bar which is loosely fitted to the rifle and protrudes to the outside of the barrel. Having a protruding state by pressing the knock bar to protrude the refill from the tip hole of the front shaft,
Further, in a compound writing instrument having a so-called compound knock mechanism in which the knock lock is released by pressing another knock bar and the refill is stored, all of the following 1) to 6) are satisfied. Knock compound writing implements. 1) In the vicinity of the rear portion of the rear shaft, a clip having a ball locking portion having a hook shape which protrudes to the outside of the shaft and can be locked inside the shaft at the front end thereof is fixedly or non-rotatably provided. 2) A long window that penetrates from the inside to the outside is provided near the rear shaft corresponding to the clip ball locking portion. 3) The center shaft (or a part such as a front shaft fixed to the center shaft by screwing or the like) is provided with a locking projection that can move only in the longitudinal direction within the long window and protrudes outside the shaft. 4) A gap S is provided between the rear shaft and the center shaft (or the front shaft fixed to the center shaft) in a state where the writing implement is attached to the clothes,
When the rear shaft or the clip is pressed forward to lock the locking projection and the ball projection, the clearance between the front shaft and the rear shaft is smaller than that of S, resulting in a clearance M (S> M). 5) In the locked state where the clearance of the shaft is M, a plurality of refills can be sequentially taken in and out by pressing the knock bar.
Writing and storage operations can be performed. 6) A so-called safety mechanism is provided in which, when the user tries to put on the clothes from the state in which the locking projection and the ball projection are locked, the locking is released and the writing portion is housed inside from the tip hole of the front shaft. 2. The rear shaft and the clip are formed integrally with each other, or one of the knock bars is formed integrally with the clip by an elastic plastic capable of lifting the clip. Item 2. The writing implement according to Item 1. 3. The writing implement according to claim 1, wherein at least one of the built-in refills contains an ink having a viscosity at room temperature of 2 mPas to 4000 mPas or a low viscosity. 4. There is a possibility that at least one of the built-in refills has a writing portion at the tip which may pierce a human body or clothes.
2. A mechanical pencil having a tip of 1 or less, a ball-point pen having a pipe-shaped nib, or the like.
4. The writing implement according to any one of items 1 to 3.