JPH09226294A - Composite writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite writing instrument which makes a user easily aware of the protrusion state of a writing tip part as a warning that a clip won't hold to a chest pocket under a state that the writing tip part is jutted way out, and also which is free from such care that a writing instrument containing the writing element of a ball-point pen filled with an intermediate viscosity water ink or a low viscosity oil ink would damage or soil clothes. SOLUTION: This composite writing instrument is structurally designed so that two writing elements 1a, 1b are mounted in a shaft cylinder 2, and the writing tip parts of these writing elements 1a, 1b, interlocked with a feed mechanism part, are selectively caused to emerge from the tip mouth of the shaft cylinder 2 alternately by rotating a rear manipulator 15 almost 180 deg. against the shaft cylinder 2. In addition, the writing instrument is equipped with a clip arranged toward the forward part of the shaft cylinder 2 with a base part fixed to one of the lateral faces of the manipulator 15 and a bulbous part 13 with an engaging part formed on the forward part of the clip 12. Further, a swollen part 11 with an engaging part is provided at an opposed position almost 180 deg. on the peripheral face of the shaft cylinder to the bulbous part 13. Only when each of the writing tip parts is protruded from the tip mouth of the shaft cylinder 2 by rotating the manipulator 15, the bulbous part 13 of the clip 12 is mutually engaged with engaging part of the swollen part 11. Thus the bulbous part 13 of the clip 12 is not separated from the face of the shaft cylinder 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-type writing instrument provided with a safety device which cannot be inserted into a breast pocket or the like with the writing tip protruding.

[0002]

2. Description of the Related Art In general, there is known a double-type writing instrument equipped with a plurality of writing objects such as a mechanical pencil and a ball-point pen so that the writing tip can be selectively protruded and retracted from an axis.

Recently, a ballpoint pen for water-based ink called medium viscosity has been developed which uses an ink having an intermediate viscosity range between water and oil (several mPa · S to several thousand mPa · S). This is a ballpoint pen using a relatively low-viscosity water-based ink having a characteristic of lowering the viscosity by the rotation of the tip ball and smoothly flowing out the ink, that is, a so-called shear thinning property. Further, as an improvement of the oil-based ball-point pen, a ball-point pen using a low-viscosity oil-based ink having excellent drying resistance can be considered.

Since the ball-point pens using the above-mentioned medium-viscosity water-based ink and low-viscosity oil-based ink have low viscosities, when the tip side is faced down, a gap is formed between the tip ball and the tip holding portion. There is a phenomenon that the ink is likely to flow backward due to a direct current problem that causes bleeding and upward writing and impact. If the ink causes backflow or direct current, there is a risk of soiling clothes and the like. In addition, when mounted on a writing instrument and inserted into a breast pocket or the like with the writing tip protruding, there is a problem in that clothes are soiled.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to prevent damage to a human body or clothes due to sharp edges of a writing tip, and to keep the writing tip dry so that the cap is removed and left to stand. Two writing bodies that form a writing medium of a medium-viscosity water-based and low-viscosity oil-based ballpoint pen having a mechanism capable of preventing direct current and backflow of ink, and having at least one ballpoint writing system It is mounted inside the barrel so that the pen tip cannot be inserted into the chest pocket if the pen tip is still protruding. It is possible to provide a double-sided writing instrument that does not exist.

[0006]

According to the present invention, two writing bodies are mounted in a barrel, and an operating body behind the barrel is approximately 18 in length.
By rotating 0 degree, the base is fixed to one side surface of the operating body in the compound writing instrument in which the respective writing tips can be selectively projected and retracted from the tip opening of the barrel by interlocking with the feeding mechanism section. And a ball portion provided with a locking portion at a front portion of the clip, the clip being disposed toward the front of the shaft cylinder, and a facing position of approximately 180 degrees on the peripheral surface of the shaft cylinder facing the ball portion. The bulging portion provided with the locking portion is provided, and the ball portion of the clip and the bulging portion are locked only at a position where the operating body is rotated and the writing tip portion projects from the tip opening of the barrel. The portions are engaged with each other so that the ball portion of the clip does not separate from the shaft cylindrical surface.

In the above, a side wall is provided on one side of the front end of the bulging portion, and a locking portion is formed by forming a convex portion and a concave portion on the front surface of the side wall, and a rear portion at the center of the rear surface of the ball portion of the clip. The ribs are provided so as to extend to the ribs, and the engaging portions formed by the convex portions and the concave portions formed on the rear surfaces of the ball portions located on both sides of the ribs are moved by the circumferential movement of the clip so that the convex portions of the bulging portions are formed into the ball portions. It is provided so as to be engaged with and disengaged from the concave portion of the.

[0008]

1 to 7 show an embodiment of the present invention. First, referring to FIG. 1, two ballpoint pen cursive bodies 1
a and 1b are mounted. The double-sided writing instrument intended by the present invention requires a so-called shear thinning medium-viscosity aqueous or ball-pen writing instrument filled with a low-viscosity oil-based ball-point pen ink, a normal oil-based ball-point writing instrument, a mechanical pencil, etc. It is used in combination depending on the situation.

The compound writing instrument of FIG. 1 has a tip shaft (not shown) and a barrel 2 for accommodating the portion of the writing instrument mechanism located at the front.
And an operating body 15 arranged at the rear end of the barrel 2.
Further, a rib 4 for preventing rotation which restricts the rotation range of the rotary shaft 5 is formed on the inner periphery of the rear end of the inner hole of the shaft tube 2, and the step portion 2b is formed.
Also, four guide ribs 3 are formed in the axial direction in the front inner peripheral portion of the shaft tube 2 at 90 degree intervals.

The rotary shaft 5 has a small diameter portion 6 in front of the large diameter portion 8 and a spiral cam groove 7 is formed on the peripheral surface of the small diameter portion 6. In addition, the large diameter portion 8 has a reduced diameter shaft portion behind the shaft portion, a protruding locking portion 9 is provided on the front outer periphery of the shaft portion, and a rotation stopping groove 10 is provided at a required position at the rear end. . Also, the large diameter portion 8
On the peripheral surface of the shaft cylinder 2 by contacting the above-described rib for preventing rotation.
A groove 8a for restricting the rotation of the rotary shaft 5 is provided in the range of approximately 180 degrees.

Inserting holes 19a, 19b are provided in front of the sliding pieces 17a, 17b, and the engaging portions of the inward projections for fixing the rear ends of the ballpoint pen writing bodies 1a, 1b, which will be described later, are provided in the inserting holes, respectively. Is provided. Further, on the rear inner surface side thereof, there are formed protrusions 18a and 18b for moving the respective sliding pieces back and forth by the pressing of the cam groove 7 accompanying the rotation of the rotary shaft 5. Further, on the outer circumferences of the sliding pieces 17a and 17b, there are formed grooves 20a, which engage with the guide ribs 3 of the shaft cylinder 2 in a rotation stop manner.
20b are provided. Therefore, the sliding pieces 17a, 1
Grooves 20a and 20b provided on the side surfaces of 7b mesh with the guide ribs 3, respectively, so that sliding slides 17a and 17b are formed.
Move back and forth smoothly. The cross-sectional shape of the sliding pieces 17a, 17b is substantially D-shaped (not shown). Therefore, there is an advantage that a complicated structure for mounting a guide cylinder having two opposing guide grooves, which is often shown in the conventional example, is not required.

The operating body 15 is formed of a crown 16 and a clip 12 extending forward from one side surface of an outer peripheral portion of the crown 16. A ball portion 13 is provided inside the clip 12 ahead,
A hole 16a is provided in front of the crown, a circumferential locking groove 16b is provided on a front peripheral surface of the hole, and a rotation stopping rib 14 is provided at a required position on a rear peripheral surface.
Is provided.

The rotary shaft 5 has the sliding piece 17a,
The protrusions 18a and 18b of the shaft 17b are inserted into the inner hole of the barrel 2 with the cam groove 7 engaged, and the rear end of the large-diameter portion 8 is brought into contact with the step 2b of the barrel and the rotary shaft is rotated. The operation body 15 is fixed to the rear end shaft portion of the steering wheel 5. At this time, the locking portion 9 of the rotating shaft
Engages with the locking groove 16b of the crown 16, the rotation-stop groove 10 engages with the rotation-stop rib 14 of the crown, and the rotation shaft 5 and the operating body 1
5 is fixed integrally, and the rotating shaft 5 is rotated by rotating the operating body 15 with respect to the shaft cylinder 2, with which one sliding piece moves forward and the other sliding piece moves backward. Further, the rear ends of the ballpoint pen writing bodies 1a and 1b are fixed to the insertion holes 19a and 19b of the sliding pieces 17a and 17b, and the front shaft is fixed in front of the barrel 2.

By the way, the bulging portions 11 are formed at two positions facing each other at an angle of about 180 degrees on the outer periphery of the shaft tube 2 slightly rearward,
A side wall 11a is provided on one side of the front end of the bulging portion 11, and a locking portion including a convex portion 11b and a concave portion 11c is formed on the front surface of the side wall 11a. Also, the clip 12
A rib 13a is provided at the center of the rear surface of the ball portion 13 so as to extend rearward, and a locking portion composed of a convex portion 13b and a concave portion 13c is formed on the rear surface of the ball portion 13 located on both sides of the rib 13a. Has been done. The convex portion 11b of the bulging portion 11 is provided to be engaged with and disengaged from the concave portion 13c of the ball portion 13 by the circumferential movement of the clip accompanying the rotation of the operating body 15.

Next, a ballpoint pen writing body mounted on the compound writing instrument of the present invention will be described. Note that the ballpoint pen writing bodies 1a and 1b have the same configuration, and have different ink colors, for example. The ink applied to the ballpoint pen writing material is a medium-viscosity water-based, low-viscosity oil-based ink having a so-called shear thinning property.

The tip of the ballpoint pen is crimped so that the tip ball is rotatably held in a state where the tip ball is substantially in contact with a seat having a channel into which ink can flow. Also, a spring is inserted in the inner hole of the tip,
The rear end of the tip is appropriately caulked so that the rear end of the spring cannot be pulled out. In addition, it is very important that the tip ball closely contacts the inner surface of the tip holding portion for the purpose of drying the writing tip and preventing direct current of the ink. For this reason, the surface roughness of the tip inner surface holding the tip ball and caulking Grinding of the inner surface to improve the close contact accuracy and secondary plastic working to improve the crimping accuracy are considered. In addition, a surface treatment or the like is taken into consideration for the surface in close contact with the tip ball. Further, the tip of the spring is a linear rod shaft portion, and the tip of the spring comes into contact with the back surface of the tip ball in a pressed state. The tip ball holds the ball of the chip by pressing it (formed by caulking).
Close to the inner edge of. (This is a known fact and is not shown.)

The ball-point pen writing bodies 1a and 1b are
The joint is formed by a front shaft portion for crimping the tip to the tip and a rear shaft portion crimped to the front end of the ink containing tube, and the front shaft portion and the rear shaft portion are connected by a flexible elastically deformable portion. It is formed of an integral resin molded product. A valve chamber, in which the ball valve is loosely fitted to face the rear end of the chip, is provided in the joint, and when the chip faces downward, the guide hole is opened and ink is conducted to the chip side. In the upward state, the ball valve is configured to seal the guide hole to prevent backflow of ink. The ink containing pipe is filled with the above-mentioned medium-viscosity water-based or low-viscosity oil-based ink, and the rear end of this ink is a grease-like half that can move by contacting the ink surface as the ink is consumed. A follower composed of a transparent non-drying substance is filled. (This is a known fact and is not shown.)

[0019]

When the operating body 15 is rotated to one side with respect to the shaft cylinder 2, the projections 18a and 18b of the sliding pieces 17a and 17b slide along the cam groove 7 as the rotary shaft 5 rotates, and One of the sliding pieces moves forward and the other moves backward, so that the writing tip of the writing body on the forward side can be projected from the tip opening of the tip shaft. Further, even if the ink storage portion of the writing pen of the ballpoint pen is not deformed, the writing tip portion flexibly shifts, so that the writing tip portion smoothly comes out of the tip opening without disturbing the operation.

Further, when one of the ballpoint pen writing bodies 1a is projected, as shown in FIG. 1, the ball portion 1 of the clip is used.
3 and the bulging portion on the peripheral surface of the shaft cylinder are engaged with each other so that the clip cannot be inserted into a chest pocket or the like.

Next, when the operating body 15, that is, the rotary shaft 5 is rotated, the sliding piece 17a is retracted, the writing tip of the ball-point pen writing body 1a is retracted into the tip shaft, and the sliding piece 17b is moved forward. At this time, the writing tip end portion is stored in the tip shaft and is in a portable state, and the clip in that state is in a position where the engagement with the bulging portion is released, and can be easily inserted into a chest pocket or the like. Also, since the ribs 13a are extended on the rear surface of the ball portion 13, there is no problem that the engaging portion of the ball portion bites into the edge of the pocket or the like when pulled out from the pocket or the like.

When the rotary shaft 5 is further rotated, the sliding piece 17a
Is further retracted, the sliding piece 17b is further advanced, and the writing tip portion of the ball-point pen writing body 1b projects from the tip opening of the tip shaft. In this state, the ball and the bulge of the rear shaft are engaged with each other so that the clip cannot be inserted into a breast pocket or the like.

[0023]

The construction and operation of the dual writing instrument of the present invention are as described above. Since the clip cannot be inserted into a breast pocket or the like while the writing tip protrudes, the projected state of the writing tip can be easily recognized. Therefore, it is possible to provide a double-type writing instrument that prevents damage to the human body and clothes due to the sharp edge of the writing tip, and has no fear of soiling clothes by mounting a medium-viscosity water-based, low-viscosity oil-based ballpoint pen. It becomes possible.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a compound writing instrument according to an embodiment of the present invention, which is partially shown in non-cross section. In addition, two kinds of ballpoint pen cursives are mounted.

FIG. 2 is a diagram showing a state in which a ball portion of a clip is engaged with a bulging portion on a peripheral surface of a shaft cylinder in a cross-sectional state of the shaft cylinder.

FIG. 3 is an enlarged view of a bulge portion of a shaft cylinder.

FIG. 4 is a view on arrow AA of FIG.

FIG. 5 is an enlarged view of a ball portion of a clip.

FIG. 6 is a view seen from the right side of FIG.

FIG. 7 is a view seen from the lower side of FIG.

[Explanation of symbols]

 1a Ballpoint pen writing body 1b Ballpoint pen writing body 2 Shaft cylinder 2a Hole portion 2b Step portion 3 Rib for guide 4 Rib 5 Rotating shaft 6 Small diameter portion 7 Cam groove 8 Large diameter portion 8a Groove 9 Locking portion 10 Rotation stop groove 11 Swelling Part 11a Side wall 11b Convex part 11c Recessed part 12 Clip 13 Ball part 13a Rib 13b Convex part 13c Recessed part 14 Locking rib 15 Operating body 16 Crown crown 16a Hole part 16b Locking groove 17a Sliding piece 17b Sliding piece 18a Projection part 18b Projection Part 19a Insertion hole 19b Insertion hole 20a Groove 20b Groove

Claims (3)

[Claims] 1. Two writing bodies are mounted in a barrel, and a rear operating body is rotated by about 180 degrees with respect to the barrel so that each writing tip is selectively linked with a feeding mechanism section. In a compound writing instrument capable of alternately projecting and retracting from a tip end of the barrel, a clip fixed to one side surface of the operating body and arranged toward the front of the barrel, and a tip portion of the clip. A ball portion having a locking portion is provided, and a bulge portion having a locking portion is provided at a position facing the ball portion at an angle of about 180 degrees on the circumferential surface of the shaft cylinder. Only in the position where the writing tip portion projects from the tip end of the barrel, the ball portion of the clip and the locking portion of the bulging portion are engaged with each other so that the ball portion of the clip does not separate from the barrel surface. A compound writing instrument characterized by being constructed. 2. A side wall 11a is provided on one side of the front end of the bulging portion 11, and a convex portion 11b and a concave portion 11 are provided on the front surface of the side wall 11a.
a locking part formed by forming c, and a ball part 13 of the clip.
A rib 13a is provided so as to extend rearward at the center of the rear surface, and the convex portion 1 is provided on the rear surface of the ball portion 13 located on both sides of the rib 13a.
The compound type according to claim 1, wherein the convex portion 11b of the bulging portion is engaged with and disengaged from the concave portion 13c of the ball portion by the circumferential movement of the clip. Writing instrument. 3. A rotating shaft, which is rotatably disposed in the inner hole of the shaft cylinder within a range of approximately 180 degrees with respect to the shaft cylinder, and has a cam groove formed on a peripheral surface of the shaft cylinder, and a rear end of the shaft cylinder. The operating body fixed to the rear end of the rotating shaft projecting in the opposite direction, and the operating body and the rotating shaft are held rotatably with respect to the shaft cylinder, and the projections that engage with the cam grooves of the rotating shaft face each other. A pair of sliding pieces formed inside is guided in the inner hole of the shaft cylinder so as to be movable back and forth,
The respective writing bodies are provided in front of the respective sliding pieces so as to be interlocked with the sliding pieces, and the respective sliding pieces alternately move back and forth by the rotation of the rotary shaft accompanying the rotation of the operating body, The double-sided writing instrument according to claim 1 or 2, characterized in that the writing tip portions of the respective writing bodies are configured so as to be capable of projecting and retracting from the shaft tube tip opening.