JPH08216583A - Cartridge for writing liquid - Google Patents

Abstract

PURPOSE: To easily and stably insert a pushing part of a feed tube of a writing utensil into an inner barrel to push a ball through in a cartridge for writing liquid without a need for a large pushing force in comparison with a conventional cartridge. CONSTITUTION: In an inner barrel 11 securely fitted into an open part of an outer barrel 10 containing writing liquid, a seat 14 made of a recessed part for fitting a ball therein is formed in an inner wall near a back opening 12 or in an intermediate part. A gap 15 is provided between an outer periphery of the inner barrel 11 from the back opening 12 at least to a part corresponding to the seat 14 and an inner wall surface of the outer barrel 10 opposed to the outer periphery. A ball 13 is fitted into the seat 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge for ink such as fountain pen, writing pen and other writing tools, and ink for writing such as Indian ink.

[0002]

2. Description of the Related Art In a conventional cartridge, as shown in FIG. 5, an inner cylinder 4 is fitted and fixed to the opening 3 side of a bottomed outer cylinder 2 in which one side of the cartridge 1 is opened. 3 and the opening 5 of the inner cylinder 4 are almost at the same position, and the ball 6 is fitted and fixed to the inner cylinder 4 near the opening 5. And outer cylinder 2
The inner wall in the vicinity of the opening 3 is in contact with the portion of the inner cylinder 4 where the ball 6 is fitted and the outer wall in the vicinity thereof.

[0003]

Conventional cartridge 1
Is a fitting part of the ball 6 when the ball 6 is pushed into the opening of the pen tip of the writing instrument neck shaft 7 or the opening where the writing tip is located from the mounting side of the ball 6 and the tip of the pushing portion 8 in the writing instrument neck shaft 7 pushes the ball 6. Since the outer circumference of the inner cylinder 4 of is in contact with the inner wall of the outer cylinder 2, there is no gap,
That is, since there is no play, the ball 6 cannot be removed from the inner cylinder 4 unless it is pressed with a considerably large force. Further, at that time, since the ball 6 is located immediately near the opening 5, the tip of the pushing portion 8 is hard to push the ball 6, and there is a problem that the screw portion of the writing instrument neck shaft 7 and the pushing portion 8 are easily damaged.

The present invention provides a cartridge capable of easily and stably inserting the pushing portion into the inner cylinder and pushing out the ball without the need to push the pushing force so much as compared with the conventional one. To aim.

[0005]

[Means for Solving the Problems] In an inner cylinder fitted and fixed in an opening of an outer cylinder for storing a writing liquid of a cartridge, a recess for ball fitting is formed in an inner wall near a rear opening or an intermediate part. A seat is provided, and a gap is provided between the outer circumference from the back opening to at least the portion where the seat is present and the outer cylinder inner wall surface facing the outer circumference, and the ball is fitted into the seat.

[0006]

The ball seat of the inner cylinder is located near or in the middle of the inner side opening of the inner cylinder when the inner cylinder is fitted and fixed to the outer cylinder. It is possible to push the ball after placing a distance from the opening and inserting the pushing part of the writing instrument neck shaft by that distance. Further, because of the distance, it is possible to insert the pushing portion into the inner cylinder by an amount equal to the distance until the tip of the pushing portion of the writing instrument neck shaft hits the ball.

Since the ball is press-fitted and fitted into the seat near the back side opening or the middle part of the inner cylinder, it is possible to thin the thickness from the back side opening to at least the seating side, and thereby the elasticity of that portion. And facilitates press fitting of the ball.

The gap between the outer peripheral surface of the inner cylinder from at least the vicinity of the seat of the ball and the corresponding inner wall surface of the outer cylinder is a play gap, and when the ball is pushed by the pushing portion, From the opening on the inner side of the inner cylinder, the inner diameter of the seat is expanded by the elasticity and the ball can be pushed out with a slight force.

[0009]

Embodiments of the present invention will be described with reference to the drawings. The inner cylinder 11 is fitted and fixed in the opening of the outer cylinder 10 of the cartridge 9. The opening 12 on the back side fitted in the outer cylinder 10 of the inner cylinder 11
A seat 14 which is a ring-shaped recess for fitting and fixing the ball 13 is provided on the inner wall near or in the middle, and the ball 13 is press-fitted from the opening 12 and fitted and fixed to the seat 14.

The diameter of the inner cylinder 11 at least in the portion corresponding to the vicinity of the opening of the outer cylinder 10 is the same as the inner hole diameter of the outer cylinder 10,
The outer circumference of the inner cylinder 11 in that portion is in contact with the inner wall of the outer cylinder 10, and the diameter of at least the portion from the opening 12 at the back to the vicinity of the seat 14 is made slightly smaller than the inner hole diameter of the outer cylinder 10. A slight gap 15 is formed between the outer circumference of the inner cylinder 11 and the inner wall of the outer cylinder 10.

Since the seat 14 of the ball 13 is close to or in the middle of the opening 12 on the back side, the inner cylinder 11 has an opening 16 on the opposite side.
Even though the portion has a thickness for reinforcement in order to be joined and fixed to the opening of the outer cylinder 10, the thickness from the opening 12 to the vicinity of the seat 14 is slightly thin, and the diameter of the ball 13 can be made slightly larger than that of the conventional one. . Of course, the diameter of the ball 13 may be the same as the diameter of the conventional ball.

To assemble this cartridge 9, the ball 13 is pressed into the inner cylinder 11 through the opening 12 of the inner cylinder 11, fitted into the seat 14, and fixed by the elasticity of the inner cylinder 11. Since the thickness from the opening 12 of the inner cylinder 11 to the vicinity of the seat 14 is made thin, the elastic force of the inner cylinder 11 facilitates the press-fitting of the ball 13.

After the outer cylinder 10 is filled with a writing liquid such as ink or India ink, the inner cylinder 11 having the balls 13 fixed therein is inserted into the outer cylinder 10 from the opening 12 side, and the outer periphery near the opening 16 is covered with the outer cylinder 11. Fit or adhere to the inner wall near the opening.

When using this cartridge 9,
When the writing instrument neck shaft 7 is inserted from the opening 16 side, the opening 16
Since there is a considerable distance from the ball 13 to the ball 13, the ball 13 is pushed after the tip of the pushing portion 8 has entered deeply until it hits the ball 13. Therefore, the tip of the cartridge 9 is the writing instrument neck shaft 7.
The ball 13 is pushed in a stable state inside and the pushing portion 8 of the writing instrument neck shaft 7 is also stable.

When the ball 13 is pushed, since there is a gap 15 on the outer circumference of the portion from the opening 12 of the inner cylinder 11 to the vicinity of the seat 14, that portion is thin and elastic, and the portion is pushed by the ball 13. , The inner diameter is enlarged, and the ball 13 can easily open with a small force as compared with the conventional cartridge.
The ink or the like in the outer cylinder 10 flows into the writing instrument neck shaft 7 through the hole at the tip of the pressing portion 8 to enable writing.

[0016]

[Effect] The cartridge according to the present invention has the ball close to or in the middle of the inner side opening of the inner cylinder, has a distance from the tip opening, and has the opening of the cartridge when mounted on the writing instrument neck shaft. Is stably inserted into the main shaft of the writing instrument, and the pushing portion of the writing instrument neck shaft is also stably inserted into the inner cylinder of the cartridge, so that the ball in the inner cylinder is easily pushed.

Since the inner cylinder is thinner than the distal end opening from the back opening to the vicinity of the seat, the thin portion has elasticity, and the ball can be fitted and fixed easily.

Since there is a gap between the outer circumference from the inner opening of the inner cylinder to the vicinity of the seat where the ball is fitted, and the corresponding inner wall of the outer cylinder, there is elasticity in that portion of the inner cylinder as described above. When pushed with the tip of the pushing portion of the writing instrument neck shaft, the inner diameter of that portion of the inner cylinder increases, and the ball is easily pushed out of the inner cylinder. Therefore, the ball can be pushed out with a little force as compared with the conventional cartridge.

As described above, there is no difficulty in inserting the cartridge into the writing instrument neck shaft, inserting the pushing portion of the writing instrument neck shaft into the cartridge inner cylinder, and pushing the ball, and it is sufficient to push with a small force. There is no risk of damaging the writing instrument neck shaft.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a cartridge.

2A is a front view of an inner cylinder and an outer cylinder of a cartridge, FIG.
(B) is a front view of the cartridge, and (C) is a sectional view of the cartridge.

FIG. 3 is a cross-sectional view of a cartridge and a cross-sectional view of main parts of a writing instrument neck shaft.

FIG. 4 is a cross-sectional view of a state in which the cartridge is fitted and inserted into the writing instrument neck shaft.

FIG. 5 is a cross-sectional view of a main part of a conventional cartridge and a writing instrument neck shaft.

[Explanation of symbols]

 1 Cartridge 2 Outer Cylinder 3 Opening 4 Inner Cylinder 5 Opening 6 Ball 7 Writing Tool Neck 8 Pusher 9 Cartridge 10 Outer Cylinder 11 Inner Cylinder 12 Opening 13 Ball 14 Seat 15 Gap 16 Opening

Claims (3)

[Claims] 1. An inner cylinder fitted and fixed in an opening of an outer cylinder for containing a writing liquid has a seat formed of a concave portion for ball fitting on an inner wall near its inner opening or at an intermediate portion thereof. An outer circumference from the back opening to at least the portion where the seat is present,
A writing liquid cartridge having a space between the outer cylinder inner wall surface facing the outer periphery and a ball fitted in the seat. 2. An inner cylinder fitted and fixed in an opening of an outer cylinder containing a writing liquid has a seat formed of a concave portion for ball fitting on an inner wall near the inner opening or at an intermediate portion thereof. A liquid cartridge for writing that has a ball fitted in a seat. 3. An inner cylinder fitted and fixed in an opening of an outer cylinder for containing a writing liquid has a seat formed of a concave portion for ball fitting on an inner wall, and at least the seat is provided from a rear opening thereof. A writing liquid cartridge in which a ball is fitted to the seat, with a gap between an outer periphery up to a part and an inner wall surface of the outer cylinder facing the outer periphery.