JPH0653185U - Ballpoint pen - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a raw ink type ballpoint pen which has a simple structure and can be manufactured at low cost. [Structure] A slide plug 4 is slidably arranged in a shaft cylinder 3 in a liquid-tight state, ink is filled in front of the slide plug 4, and a ball 1 is rotated with a part of the ball 1 protruding from a tip. The freely held chip 2 is fixed to the tip of the barrel 3, and the ball 1 is repulsed by the spring 5 so as to contact the inward tip edge 26 of the tip 2 when not in use. Alternatively, a paste-like backflow preventing agent is placed in place of the slide stopper.

Description

[Detailed description of the device]

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

[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.

For this reason, a raw ink type ballpoint pen in which ink is directly filled in an ink cylinder and a pen core having a mechanism for displacing air and ink and a mechanism for containing excess ink is arranged at the tip of a barrel is put to practical use. ing. The raw ink type ballpoint pen has the advantages that a large amount of ink can be filled in the ink cylinder, 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 portion composed of a large number of comb teeth, and it is necessary to closely adhere to the inner peripheral surface of the ink cylinder. Because of this, accuracy is required. Therefore, it takes time and labor 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, the ball-point pen of the present invention has a slide stopper slidably arranged in a liquid-tight state inside an ink cylinder so as to fill ink in front of the slide stopper and to partially cover the ball. Fix the tip rotatably held while protruding from the tip to the tip of the ink cylinder, and spring the ball so that it comes into contact with the inward tip edge of the tip when not in use. . Alternatively, a paste-like backflow preventing agent is placed in place of the slide stopper.

[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. The mechanism prevents the ink from falling off even with low viscosity ink. On the other hand, when writing, the ball retracts due to the writing pressure, the valve mechanism opens and the ink is consumed.However, as the ink is consumed, the slide stopper or the backflow preventive agent moves forward, so the ink cylinder that accompanies the ink consumption The negative pressure inside can be eliminated, and 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 connected to the opening of the tip of the ink cylinder 3 which functions as a shaft cylinder directly or via a holder (not shown).

A slide stopper 4 made of, for example, silicon rubber is slidably arranged in a liquid-tight state inside the ink cylinder 3, and from the slide stopper 4 to the inner hole 21 of the chip 2, the viscosity is low. It is completely filled with water-based ink (not shown) and contains no air. Therefore, when the ink is consumed, the slide plug 4 slides forward. In other words, this is a raw ink type ballpoint pen with a large writable distance, but since the air that easily expands due to heat is not mixed in front of the slide stopper 4, the sliding resistance of the slide stopper 4 contributes to the prevention of ink dripping. is doing. A tail plug 6 having a vent hole 61 is fitted on the tail end of the ink cylinder 3. Alternatively, as shown in FIG. 2, a paste-like backflow preventive agent 7 is placed in place of the slide stopper 4, and a low-viscosity aqueous ink (not shown) is applied from the backflow preventive agent 7 to the inner hole 21 of the chip 2. It may be filled.

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 ink cylinder 1 has a negative pressure, but the slide stopper 4 or the backflow preventive agent 7 advances as the ink is consumed. Therefore, the negative pressure in the ink cylinder 1 is released, the ink is sufficiently supplied to the ball 1, and writing can be continued.

[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 a slide stopper or a paste-like backflow preventive agent is placed inside the ink cylinder to prevent the ink from dripping, the slide stopper moves forward even when the ink is consumed, You can continue writing without negative pressure. Therefore, a pen core having a complicated structure and requiring high accuracy is not required, and a ballpoint pen having a simple structure and which can be manufactured at low cost can be obtained.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of another embodiment of the present invention.

[Explanation of symbols]

 1 Ball 2 Tip 21 Inner Hole 22 Ball House 23 Center Hole 26 Tip Tip Edge 3 Ink Cylinder 4 Slide Stopper 5 Spring 6 Tail Stopper 7 Backflow Prevention Agent

Claims (2)

[Scope of utility model registration request] 1. A slide stopper is slidably arranged in a liquid-tight state in an ink cylinder, ink is filled in front of the slide stopper, and a ball is freely rotatable in a state where a part of the ball is exposed from the tip. A ball-point pen characterized in that the tip held in the tip is fixed to the tip of an ink cylinder, and the ball is repulsed by a spring so as to contact the inward tip edge of the tip when not in use. 2. A paste-like backflow preventing agent is arranged in the ink cylinder to fill the ink in front of the backflow preventing agent plug, and the ball is allowed to rotate freely with a part of the ball protruding from the tip. A ball-point pen characterized in that the held tip is fixed to the tip of an ink cylinder, and the ball is repulsed by a spring so as to contact the inward tip edge of the tip when not in use.