JPH0642253U - Ballpoint pen - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a ball-point pen which has a simple structure and can be manufactured at low cost. [Structure] A tip 2 is fixed to the tip of an elastic cylinder 4 filled with ink via a front opening 3, and a ball 1 is partially exposed from the tip inside the tip of the tip 2. Hold the ball freely while the ball 1 is spring 5.
When not in use, the tip edge of the tip 2 faces inward.
Contact with.

Description

[Detailed description of the device]

The present invention relates to a raw ink type ballpoint pen in which ink is directly filled in a barrel.

[0002]

[Prior art]

 Since inks, especially water-based inks, have low viscosity, it is necessary to prevent ink dripping when using water-based inks. For this reason, in many cases, a batting method is used in which a batting formed by aligning crimped ultrafine fibers into a rod shape contains water-based ink, and the ink in the batting is supplied to the balls through a relay core. However, since the fluffy ballpoint pen has a limited ability to absorb ink in the batting, it has a short writing distance, and it is impossible to completely exhaust the ink to the end, making it difficult to know the end point.

Therefore, a raw ink type ballpoint pen in which ink is directly filled in the barrel and a pen core having a mechanism for replacing air and ink and a mechanism for containing excess ink is arranged at the tip of the barrel is put to practical use. ing. Raw ink type ballpoint pens have the advantages that a large amount of ink can be filled in the barrel and the writing distance is long, and the ink can be used up to the end.

[0004]

[Problems to be solved by the device]

 However, the above-mentioned pen core has a complicated structure because it has a capillary ink groove, an air groove, and an ink storage section composed of a large number of comb teeth, and needs to be closely attached to the inner peripheral surface of the barrel. Therefore, accuracy is required. Therefore, it takes a lot of time to manufacture the pen core, which is an obstacle to cost reduction.

Therefore, an object of the present invention is to provide a raw ink type ballpoint pen which has a simple structure and can be manufactured at low cost.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, in the ballpoint pen of the present invention, a tip is fixed to the tip of a flexible barrel filled with ink via a front opening, and a ball is partially inserted inside the tip of the tip. Hold the ball freely while protruding from the tip, and make the ball spring out of contact with the inward tip edge of the tip when not in use.

[0007]

[Action]

 When not in use, the ball rotatably held at the tip of the tip is spring-loaded and contacts the inward tip edge of the tip. A mechanism is configured to prevent ink dripping. On the other hand, when writing, the ball retracts due to the writing pressure, and the valve mechanism opens.However, if you press lightly on the elastic barrel with your fingertip, the negative pressure in the barrel due to ink consumption can be eliminated. , Ink is supplied to the ball to enable writing. That is, since the pen core having a complicated structure and requiring high accuracy is not required, the structure is simple and the manufacturing cost is low.

[0008]

【Example】

 The present invention will be described in detail below with reference to the embodiments shown in the drawings. In FIG. 1, a shell-shaped stainless steel tip 2 has an inner hole 21 that is an ink passage hole inside, and a ball house 22 is formed at the tip. The ball house 22 communicates with the inner hole 21 via a central hole 23 and a radially formed vertical groove 24. Then, in the ball house 22, a ball 1 made of, for example, a cemented carbide having a diameter of 1.0 mmφ is held so as to be movable in the front-rear direction by a predetermined distance, and the tip 2 of the tip 2 is separated from the tip edge 26 thereof. The department is in front.

A spring 5 having a small mass is arranged in the inner hole 21 of the chip 2. The tip of the spring 5 is inserted into the center hole 23 to urge the ball 1 forward, and the ball 1 is in contact with the tip edge 26 of the chip 2 when not in use. That is, the ball 1 and the tip edge 26 of the tip 2 constitute a valve mechanism, which prevents ink from dripping without using a pen core. A pusher may be interposed between the ball 1 and the spring 5 to urge the ball 1 forward by the pusher.

The tip 2 is held by the front opening 3, and the front opening 3 is connected to the front end opening of a shaft cylinder 4 formed of a highly elastic material. A low-viscosity water-based ink (not shown) is filled from the inside of the barrel 4 to the inner hole 21. In other words, it is a raw ink type ballpoint pen with a large writing distance.

In use, however, if the ball 1 is moved along the writing surface while being pressed, the ball 1 retreats against the resilience of the spring 5 and rotates while being in contact with the seat portion 25. So you can write down. At this time, when the ink is consumed, the inside of the barrel 1 becomes a negative pressure. However, when the barrel 4 is pressed with a fingertip to reduce the internal volume a little, the negative pressure in the barrel 1 is released and the ink is removed. Sufficient supply in ball 1 to continue writing.

[0012]

[Effect of device]

 As described above, in the ball-point pen of the present invention, when not in use, the ball rotatably held at the tip of the tip is repulsed by the spring and comes into contact with the inward tip edge of the tip, and the valve mechanism Since it is configured as described above, ink dripping can be prevented. Therefore, a pen core having a complicated structure and requiring high accuracy is not required, and the ballpoint pen can be manufactured with a simple structure and at a low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

[Explanation of reference symbols] 1 ball 2 chip 21 inner hole 22 ball house 23 center hole 26 tip end edge 3 front opening 4 shaft cylinder 5 spring

Claims (1)

[Scope of utility model registration request] 1. A tip is fixed to the tip of an elastic cylinder filled with ink through a front port, and a ball is freely rotatable inside the tip of the tip with a part of the ball protruding from the tip. A ball-point pen characterized in that it is held and held in contact with an inward tip edge of the tip when not in use because the ball is spring-backed.