JP3271944B2 - Ballpoint pen refill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotatably holding part of a ball protruding from the tip end of a chip, and the back surface of the ball is directly on the inner wall surface of the tip end edge or via a pressing element. The present invention relates to a ballpoint pen refill provided with a ballpoint pen tip having a coil spring for pressing.

[0002]

2. Description of the Related Art Conventionally, by providing a valve mechanism in which a ball is always pressed directly on the inner wall surface of a tip end by a coil spring or via a pressing element, dripping of ink during non-writing is prevented. Ballpoint pen refills are known. In addition, various methods have been proposed or disclosed for such coil springs and coil spring holding methods. For example, when holding a coil spring, it is known to make the rear of the coil spring end-turn in order to stably hold the seat.

A ballpoint pen refill is also known in which an ink containing tube is directly filled with an ink having a shear-thinning viscosity and a grease-like follower that follows the consumption of the ink, and is actually commercially available. In the process of filling the ink containing tube with the ink and the follower, there is an actual problem that air is contained in the ink containing tube and the ballpoint pen tip at the time of filling. Since the air accumulated in the ballpoint pen tip causes deterioration of initial writing, etc., in the manufacturing process of the ballpoint pen refill,
For example, a step of forcibly releasing air from the rear end opening of the ballpoint pen refill using a centrifuge is provided.

[0004]

However, in a structure in which a coil spring for always pressing the ball against the inner wall surface of the tip of the ballpoint pen is provided inside the ballpoint pen tip,
In the step of releasing the air, there is a fact that it is difficult for the air accumulated in the ballpoint pen tip to escape.

SUMMARY OF THE INVENTION In view of the above problems, the present invention relates to an ink container having a high viscosity which is statically high and has a viscosity reduced by rotation of a ball at the time of writing so that the ink flows out. Fill the back end of the ink with a grease-like follower that follows the consumption of the ink, and insert the tip
A part of which is protruded from the tip end via the holder
A coil spring that holds the ball in a rotatable manner and presses the back surface of the ball against the inner wall surface of the tip end edge directly or through a pressing element is formed in an end winding behind the coil spring. <br/> and disposed the ballpoint pen tip, a coil spring
Insert the tip formed on the tip of the tip holder into the tip of the tip holder.
In the axial direction smaller in diameter than the engaging hole connected to the engaging hole
Inwardly projecting stepped retention with extended ink flow passage
In a ball-point pen refill which is in contact with a portion, the structure is such that air is easily released in a step of releasing air in the manufacturing process of the ball-point pen refill, and a ball-point refill with good initial writing is obtained.

[0006]

In order to achieve the above object, according to the present invention, the ink storage tube has a high viscosity in a static state, and the viscosity decreases due to the rotation of the ball during writing, so that the ink flows out. And a ball having a rear end which is filled with a grease-like follower which follows the consumption of the ink and a part of which protrudes from the tip end via a tip holder. the rotatably and holding, the coil scan purine coil spring for pressing directly or via pushing element the back of the ball on the inner wall surface of the tip end edge
The tip of the coil spring is attached to the tip holder with the ball-point pen tip
Connected to an engagement hole for fitting a chip formed at the tip of
Has an ink flow passage that extends in the axial direction and has a smaller diameter than the engagement hole
That in Borupe <br/> Nrefiru made in contact with the stepped retaining portion protruding inwardly, it is provided with a air escape path before Kiho lifting unit.

Further, the holding portion of the coil spring is formed in a tapered shape in the axial direction.

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A ball-point pen refill 1 according to a first embodiment shown in FIGS. 1 and 2 has a ball holding chamber 4 and a ball seat 5 for holding a ball 3 on a chip 2. FIG. And an ink flow path hole 6 formed at the center of the ball seat 5. The ball 3 is rotatably held by caulking the tip end 7 inward by caulking so that a portion of the ball 3 extends outward from the tip end 7. .

The chip 2 is fitted into an engagement hole 11 formed at the tip of a chip holder 10. An ink flow passage 12 having a smaller diameter than the engagement hole 11 communicates with the rear of the engagement hole 11. A holding portion 13 of a stepped coil spring 8 formed by connecting the engagement hole 11 and the ink flow passage 12 is provided. The coil spring 8 is held by abutting the rear end 8 a of the holding portion 13 on the holding portion 13. It is urged forward and loaded in the chip 2 and the chip holder 10. Ball 3
Is always in contact with the inner wall surface 7a of the tip end 7 by the coil spring 8. Further, the holding portion 13 is provided with a concave groove-shaped air escape path 15 extending in the axial direction.

In this embodiment, the coil spring 8
Thus, the ball 3 is always pressed against the inner wall surface 7a of the tip end 7, but the ball may be pressed against the inner wall surface of the tip end via a pressing element.

Further, in order to receive the writing pressure applied to the ball 3 during writing, and to make the rotation of the ball 3 smooth,
Although the structure is provided with the ball seat 5, a structure without the ball seat may be employed. Also, the inner wall surface 7a of the tip end 7
Is preferably formed in the same spherical shape as the ball 3 because the effect of the valve structure composed of the ball and the inner wall surface at the tip end of the tip is improved.

As described above, the coil spring 8
The rear end 8a of the coil spring 8 is held in contact with a stepped holding portion 13 projecting inwardly into the ink flow passage 12 of the chip holder 10, but the rear end of the coil spring is made end-to-end winding. When held, the sitting of the coil spring is stabilized.

An ink (not shown) behind the chip holder 10 which has a high viscosity statically, has a viscosity reduced by the rotation of the ball during writing, and has a viscosity reduced by the ink flowing out, At the rear end of the ink, there is provided an ink storage tube 14 which is directly filled with a grease-like follower (not shown) that follows the consumption of the ink.

In the above-described method of manufacturing the ballpoint pen refill 1, a centrifuge (not shown) is used as a step of releasing air accumulated in the chip 2, the chip holder 10 and the ink storage tube 14. Even if the coil spring 8 is loaded, the air trapped in 2 moves to the ink storage tube 14 through the air escape path 15 so that the air can easily escape.

The ball-point pen refill 21 of the second embodiment shown in FIGS. 3 and 4 is repelled forward by a coil spring 28 loaded in the chip 22 and the chip holder 30 in the same manner as in the first embodiment. It is always in contact with the inner wall surface at the tip of the tip.

The coil spring 28 has a rear end formed by an end winding and a reduced diameter portion 28b whose diameter is gradually reduced toward the rear end 28a. The coil spring 28
Since the reduced diameter portion 28b is held in contact with the holding portion 33 formed in a tapered shape with respect to the axial direction formed on the chip holder 30, the area in contact with the holding portion 33 increases,
This is preferable because the stability of sitting when held is further increased.

The holding portion 33 is provided with three stepped portions projecting inwardly into fitting holes 31 into which the chips 22 of the chip holder 30 are fitted, at circumferentially equal intervals in three substantially triangular cross sections. It is formed. The corner portion having a substantially triangular cross section serves as an air escape path 35 when the coil spring 28 is held by the holding portion 33.

In the manufacturing process of the ballpoint pen refill 21, a centrifuge (not shown) is used as a process of releasing air collected in the chip 22, the chip holder 30 and the ink storage tube 34. In the process, the air accumulated in the chip 22 moves to the ink storage tube 34 through the air escape passage 35 even if the coil spring 28 is loaded, so that the air is easily escaped.

Further, by forming the holding portion 33 in a tapered shape, it is possible to flow the air in the centrifugal step without opposing the flow of air, so that the air remaining in the chip 22 is natural. However, it is preferable because air existing on the holding surface 33a can be easily released in the centrifugation step.

[0021]

As described above, the ball-point pen refill of the present invention has the above-described structure, and has a structure in which air is easily released in the step of releasing air in the ball-point pen refill assembly process. Obtainable.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a ballpoint pen refill according to a first embodiment of the present invention.

FIG. 2 is an AA end view of FIG.

FIG. 3 is a longitudinal sectional view of a ballpoint pen refill according to a second embodiment of the present invention.

FIG. 4 is a BB end view in FIG. 3;

[Explanation of symbols]

 1,21 Ball-point pen refill 2,22 Tip 3,23 Ball 8,28 Coil spring 8a, 28a Rear end 28b Reduced diameter part 13,33 Holding part 14,34 Ink storage tube 15,35 Air escape path

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B43K 1/08 B43K ^7/ 00-7/08

Claims (2)

(57) [Claims] 1. An ink having a high viscosity which is statically high and has a viscosity reduced by rotation of a ball during writing, and which has a shear-thinning viscosity so that the ink flows out. Is filled with a grease-like follower that follows the consumption of ink, and a tip holder is rotatably holding a part of the ball protruding from the tip end via a tip holder. the coil spring coil spring for pressing directly or via pressing element on the inner wall surface of the
Behind the end of the coil spring, arrange the ballpoint pen tip inside, and attach the rear end of the coil spring to the tip holder.
The engaging member connected to an engaging hole for fitting a chip formed at the tip end
Has an ink flow passage that extends in the axial direction and has a smaller diameter than the hole
In contact with becomes ballpoint refill stepped holding portion protruding inwardly, ball-point pen is characterized by providing an air escape path before Kiho lifting unit refill. 2. The ballpoint pen refill according to claim 1, wherein the holding portion of the coil spring is formed in a tapered shape in the axial direction.