JPH11170755A - Writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a metal ring from freely rotating on the rim of a joint, and also, prevent the metal ring from dropping off when barrel cylinders being screwed with the joint are removed by a method wherein a female thread part provided on the inner peripheral surface of the metal ring is screwed with an intermediate part of the joint, and at the same time, both barrel cylinders are screwed with a male thread part of the joint. SOLUTION: With male thread parts 5 which are provided on a joint 4, a female screw part 8 provided on the inner peripheral surface of the rear end of a front barrel cylinder 2, and a female thread part 9 provided on the inner peripheral surface of the front end of a rear barrel cylinder 3 are screwed, and the front barrel cylinder 2 and the rear barrel cylinder 3 are connected to the joint 4. Then, a female thread part 7 of a metal ring 6 of which the thickness excepting the threaded part is 0.15-0.3 mm is screwed with an intermediate part of the joint 4, and the metal ring 6 is arranged between the front barrel cylinder 2 and the rear barrel cylinder 3, and in both barrel cylinders 2, 3, a pen body 20 is arranged, and at the same time, this writing utensil is formed into a structure wherein at the time of writing, a nib 20a provided at the front part of the pen body 20 is projected from the tip end opening 20b of the front barrel cylinder 2. By this method, the metal ring is prevented from freely rotating on the rim of the joint, and when the barrel cylinders which are screwed with the joint are removed for a replacement or the like of the pen body, the metal ring does not drop out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front shaft cylinder and a rear shaft cylinder which are screwed and connected to a male screw portion provided on a joint, and a ferrule is mounted between the front shaft cylinder and the rear shaft cylinder. Writing instruments.

[0002]

2. Description of the Related Art Conventionally, a writing instrument having a structure in which a front barrel and a rear barrel are screwed and connected to a male screw portion provided on a joint, and a ferrule is mounted between the front barrel and the rear barrel is often used. As is known, generally, the ferrule is provided around a joint that connects the front and rear barrels by screwing, or as shown in FIG. It is held and integrated and interposed between the front barrel 41 and the rear barrel 42.

[0003] By the way, the ferrule provided around the joint is configured such that the ferrule freely rotates on the outer periphery of the joint, or the shaft cylinder 31 or 3 screwed to the joint by exchanging a pen body in the shaft cylinder.
In order to prevent the metal ring 34 from dropping when the metal ring 2 is removed, the metal ring 34 is fixed to the outer peripheral surface of the joint 33 with an adhesive 35 or the like as shown in FIG.

[0004] Also, the metal ring used as the exterior is usually plated. However, when the joint and the metal ring are integrated, the outer peripheral surface is damaged due to the heavy weight when plated with a barrel. Therefore, it was necessary to perform plating by hooking to prevent the occurrence.

[0005]

However, as for the bonding, the bonding must be performed while paying attention so as not to stain the external thread portion provided on the joint at the time of bonding, and therefore, a careful operation is required. It takes time and effort. Regarding the plating process, the plating process by hooking has a problem that the working efficiency is inferior to the plating process by the barrel, so that it is applied only to some high-quality writing instruments.

An object of the present invention is to mount a ferrule between the front barrel and the rear barrel, and to prevent the ferrule from rotating freely around the outer periphery of the joint, and to replace the pen body in the shaft cylinder with the joint. It is an object of the present invention to provide a writing instrument that does not cause a metal ring to fall off when a screwed barrel is removed.

[0007]

In order to achieve the above object, according to the present invention, a front barrel and a rear barrel are screwed and connected to a male screw portion provided on a joint, and the front barrel and the rear barrel are connected. And a female thread portion provided on the inner peripheral surface of the metal ring is screwed into an intermediate portion of the joint, and both shaft cylinders are screwed into a male screw portion of the joint.

In the present invention, the term “ring” refers to a hollow ring shape and can be used without being particularly affected by the wall thickness. Preferably, the wall thickness excluding the thread is 0.15.
It is effective when used for thin-walled materials having a thickness in the range of mm to 0.3 mm.

A projection having a diameter larger than the outer diameter of the male screw portion and having a tapered portion is provided at an intermediate portion of the joint,
The metal ring is attached to the joint while the female thread portion of the metal ring is inserted into the taper portion.

Further, when removing one of the front barrel and the rear barrel by exchanging the pen body in the barrel, it is better not to remove the other, so that either the front barrel or the rear barrel is not removed. One,
The structure is such that it is screwed into the male screw part of the joint and fixed by bonding.

Further, by making the screw portion a trapezoidal screw, the volume of the metal ring increases and the strength increases. In particular, in the case of a thin wall having the above-mentioned thickness range of 0.15 mm to 0.3 mm, it is more preferable that the thread portion is a trapezoidal screw.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a writing instrument according to an embodiment of the present invention; FIG. A female screw portion 8 provided on the inner peripheral surface of the rear end of the front barrel 2 and a female screw portion 9 provided on the inner peripheral surface of the front end of the rear barrel 3 are screwed and connected to the male screw portion 5. 0.2mm thickness excluding the screw thread in the middle of
By screwing and connecting the female screw part 7 of the metal ring 6,
The ferrule 6 is disposed between the front barrel 2 and the rear barrel 3, the pen body 20 is disposed in the two barrels 2, 3, and a pen tip 20 a provided in front of the pen body 20 during writing. Are projected from the front end opening 20b of the front barrel 2. Note that each of the screw portions 5, 7, 8, 9 is a trapezoidal screw.

The joint 4 is provided with a projection 10 having a diameter larger than the outer diameter d of the male screw portion 5 at an intermediate portion thereof so as to form a screwed end when the metal ring 6 is screwed and connected. The dimensions are provided. The protrusion 10 is provided with a taper portion 11 at an angle of 30 ° with respect to the axial direction on the side where the metal ring 6 is screwed, and the female screw portion 7 provided on the inner peripheral surface of the metal ring 6 is tapered. The metal ring 6 is mounted so as to fit into 11 parts. In addition, the angle of the taper portion can be adjusted to 30 ° to 70 °.

FIG. 4 shows another embodiment in which the female thread 8 of the front barrel 2 is screwed into the male thread 5 of the joint 4 and fixed by an adhesive 12, and the other embodiments are the same as those of the above-described embodiment. Is the same as

【The invention's effect】

Since the writing instrument of the present invention has the above-described structure, a ferrule is mounted between the front barrel and the rear barrel, and the ferrule does not rotate freely around the outer periphery of the joint. When the shaft cylinder screwed to the joint is removed by replacement or the like, the ferrule does not fall off.

In addition, since the metal ring can be made thinner, plating can be performed using a barrel, so that there is an advantage that production can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of the embodiment.

FIG. 3 is a front view showing the joint of the embodiment.

FIG. 4 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a main part of a conventional writing instrument.

FIG. 6 is a longitudinal sectional view of a main part of a conventional writing instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Writing implement 2 Front barrel 3 Rear barrel 4 Joint 5 Male screw part 6 Gold ring 7 Female screw part 8 Female screw part 9 Female screw part 10 Protrusion part 11 Taper part 12 Adhesive 20 Pen body

Claims (4)

[Claims] 1. A writing instrument comprising a front barrel and a rear barrel connected by screwing to male screw portions provided at both ends of a joint, and a ferrule attached between the front barrel and the rear barrel. A writing implement characterized in that a female screw part provided on the inner peripheral surface of a metal ring is screwed into an intermediate part of a joint, and both shaft cylinders are screwed into a male screw part of the joint. 2. An intermediate portion of the joint is provided with a protrusion having a diameter larger than the outer diameter of the male screw portion and having a taper portion, and the female screw portion of the metal ring is inserted into the taper portion. 2. The writing instrument according to claim 1, wherein the metal ring is attached to the joint while being rotated. 3. One of a front barrel and a rear barrel is screwed into a male thread portion of a joint and fixed by bonding.
The writing implement according to claim 1. 4. The writing instrument according to claim 1, wherein the screw portion is a trapezoidal screw, and a thickness of the metal ring excluding a thread is in a range of 0.15 to 0.3 mm. .