JPH0717513Y2 - Side knock type writing instrument - Google Patents

Description

TECHNICAL FIELD The present invention relates to a side knock type writing instrument of a type in which a ball is operated to open a valve by pressing a side portion of a flexible shaft cylinder.

2. Description of the Related Art As a side-knock type writing instrument of the type described above, Jitsuko Sho 52-
Proposals such as Japanese Patent No. 4103 are disclosed. The above is to interpose an actuator composed of a bent plate piece that extends in two directions.Because the pressing direction has directionality, the pressing point is limited, and the bending property of the plate piece is reduced due to repeated practical use. It tended to decline and did not satisfy endurance. As an attempt to solve the above-mentioned problems, Japanese Utility Model Publication No. 45-22651 discloses a structure in which a valve rod is hit by a metal ball that also serves as an agitator of ink to open the valve. In addition to the risk that the valve will open due to the impact when dropped or falling, the discharge amount is unstable, and in addition, a laborious operation such as a shaking operation of the shaft cylinder is required to hit the ball with the valve rod.

Problems to be Solved by the Invention The present invention solves the problems of the above-described writing instrument of the bent plate piece and the type of writing instrument that is opened by hitting a ball, and always operates stably and accurately for repeated practical use. It aims to provide a convenient side-knock type writing instrument.

Means for Solving Problems The writing instrument of the present invention will be described with reference to the drawings (see FIGS. 1 to 3).

The side-knock type writing instrument 1 of the present invention has a valve body 31 in which a valve body 31 biased rearward by a spring 33 is seated in a flexible cylinder 2.
A valve mechanism 3 that is in close contact with the valve mechanism to form a closed state is mounted, and the pressing portion on the side of the barrel 2 near the rear of the valve mechanism 3.
When the valve 22 is pressed, the valve stem 311 projected toward the ink storage portion side via the ball 5 is pushed to displace the valve body 31 forward to open the valve, and the writing end from the ink storage portion 21 at the rear of the shaft cylinder. The ink is led out to the portion 41, and it is required that the ball 5 has a diameter slightly smaller than the inner diameter of the barrel of the pressing portion 22 and that the spring 33 is not compressed by the movement in the barrel. .

In the above, the inside of the rear portion of the shaft cylinder 2 is the ink storage portion 21, the ball 5 is movably inserted in the ink storage portion, and the valve mechanism 3 is attached to the front portion of the shaft cylinder 2. A writing instrument 1 is constructed by attaching a neck portion 4 holding a writing tip portion 41 to the front portion of the barrel 2.

At least the pressing portion 22 of the shaft cylinder 2 can be deformed by pressing with a fingertip, and it is necessary to have elasticity such that it can be automatically restored after the pressing force is released, and it is formed thin by blow molding of plastic or the like.

The ball 5 is a ball having a specific gravity that is at least larger than that of the ink and is movable in the ink storage portion 21. The ball 5 of the valve mechanism 3 is in the previous stage of the valve opening operation (the writing tip side is facing downward). It is necessary to move to the rear end portion and contact the valve rod portion 311, but the spring 33 is compressed by the load of the ball itself or the impact force due to the movement of the ball in the axial cylinder, and the valve element is moved forward. A ball having a weight that does not displace may be used, and a ball made of a material such as plastic, metal, glass, or ceramic is appropriately used. Then, the valve is opened only by the operation of pressing the latter half of the ball by the pressing force by the pressing deformation of the pressing portion 22 on the side of the shaft cylinder.

The ball 5 is brought into contact with the rear end of the valve rod portion 311 protruding toward the ink storage portion 21 by pressing the writing tip end side downward, and pressing the pressing portion 22 on the shaft cylinder side portion with the fingertip. The latter half of the outer surface of the ball is pinched. At this time, since the outer diameter of the ball 5 is slightly smaller than the inner diameter of the pressing portion 22, the ball is displaced forward without unnecessary stress, and the ball moves toward the valve rod. Department
While pressing 311 it moves toward the writing tip, the valve body 31 is displaced forward against the bias of the spring 33 and the valve opens, the ink in the ink reservoir is supplied to the writing tip, and the pressing is released. Then, the valve body 31 is returned to its original position by the elastic force of the spring 33, and the valve closed state is maintained. Since the ball 5 has such a weight that the spring 33 is not compressed by the movement in the barrel, the valve is opened even if the writing instrument is in a vibrating state and the ball 5 is in contact with the rear end of the valve rod portion 311. Never.

Embodiments Embodiments of the present invention will be described below.

FIG. 1 shows the state before the valve opening operation (the writing tip end side is facing downward), and FIG. 2 presses the side portion of the shaft cylinder to start valve opening, and ink is led out toward the writing tip direction. FIG. 3 shows a state in which the ball is brought into contact with the stopper portion 323.

The shaft cylinder 2 is a plastic blow-molded body having an ink storage portion 21 inside, is thinly formed so as to have flexibility, and a valve mechanism 3 is attached to a tip opening portion thereof.
A ball 5 is inserted between the ink storage portion 21 and the ink storage portion 21, and a neck portion 4 into which a writing tip portion 41 is press-fitted and held is screwed to the tip end opening portion of the shaft cylinder to form a writing tip portion.

The shaft cylinder 2 is formed with a large diameter in the writing tip direction, and descends from the pressing portion 22 toward the rear of the shaft cylinder so that the ball moves from the front side to the rear side along the shaft cylinder direction when placed horizontally (not shown). It can be configured so as not to have a gradient, avoid a state of contact with the valve rod portion 311, and prevent the valve opening operation even when the side portion such as the shaft is carelessly pressed.

The valve mechanism 3 includes a valve body 31, a valve cylinder 32, a spring 33, and a spring seat 34.

The valve cylinder 32 has a valve seat 321 for closely contacting the valve body 31 with the inner peripheral surface.
Is provided so as to project, a stopper portion 323 is formed at one end of the tubular portion, and a flange portion 322 is formed at the other end.

The stopper portion 323 has an inner diameter slightly smaller than the outer diameter of the ball, limits the opening amount of the valve by closely contacting with the ball when pressed, and temporarily stops or controls the ink inflow from the ink storage portion, It also functions as a fixed amount discharge.

The valve body 31 is urged to the rear of the barrel by the spring 33, and the valve seat 321
And a valve rod portion 311 continuous with the valve body is assembled in the valve cylinder 32 so as to slightly project rearward from the stopper portion 323 at the rear end of the valve cylinder 32 by the valve opening stroke. The guide portion 312 of the valve body 31 is provided so as to project somewhat forward of the ink lead-out hole 341 in order to ensure the stability of movement of the valve body 31 in the valve cylinder 32.

The spring 33 urges the valve body 31 rearward with an elastic force of about 800 g, so that the valve seat
Closed close to 321.

The spring seat 34 has a structure in which a flange is projected inside and outside of one end, and the spring 33 is received inside and the outside flange is tightly fitted to the valve cylinder flange portion 322.

The ball 5 is an injection molded body made of nylon (specific gravity: about 1.14,
The outer diameter of the ball is 10.3 mm, and the weight is about 0.65 g).

The neck portion 4 is fixed so that the writing tip portion 41 partially projects to the outside, accommodates the impregnated body 42 (annular sponge) inside, and is screwed to the barrel 2. More specifically, the writing tip portion 41 is fixed by a plurality of axially extending ribs arranged inside the neck portion 4, and an axial air groove is formed in the neck portion. There is.

When ink (ink amount about 8.0g, specific gravity about 0.9) was filled in the shaft cylinder and a writing instrument was assembled and put to practical use, the product was transported and the product was forcibly shocked, but the valve body opened. Instead, the valve closed state is maintained, and when the writing tip is directed downwards and the pressing portion on the side of the shaft cylinder is pressed to attempt the valve opening operation, the ball abuts the valve stem and immediately becomes normal. The valve was opened easily and ink was drawn out to the writing tip.

In the above embodiment, in the valve cylinder stopper portion 323,
Although the ink flow is temporarily stopped, it is possible to provide a slit or a lateral hole on the side of the valve cylinder 32 so that the ink always flows in the space between the stopper portion 323 and the valve seat 321.

Effect of the Invention Since the side-knock type writing instrument of the present invention has a ball as the actuator, there is no direction in the pressing portion on the side of the shaft cylinder, the operation is always smooth, and there is a problem in terms of endurance of the actuator. Instead, it always functions normally and satisfies practicality when it is repeatedly used. In addition, the valve does not open due to the action of the ball itself, but the valve opens due to the synergistic action of pressing the pressing point on the side of the shaft cylinder, so there is a risk that the valve will open due to the impact during transportation or drop. In addition, it is possible to reliably derive the intended amount of ink. Further, the number of parts is small, and the production efficiency is good, and it is suitable as a convenient side-knock writing instrument.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the writing instrument of the present invention in a non-valve open state, FIG. 2 is a vertical cross-sectional view showing a state in which ink is discharged toward the tip of the writing by a valve opening operation, and FIG. FIG. 6 is a vertical cross-sectional view showing a state in which the ink is stopped from flowing toward the writing tip portion by the ball. 1 …… Side knock type writing instrument 2 …… Shaft cylinder 21 …… Ink storage part 32 …… Pressing part 3 …… Valve mechanism 31 …… Valve disc 311 …… Valve rod 312 …… Guide part 32 …… Valve cylinder 321 …… Valve seat 322 …… Ball part 323 …… Stopper part 33 …… Spring 34 …… Spring seat 341 …… Ink lead-out hole 4 …… Neck part 41 …… Writing tip part 42 …… Impregnator 5 …… Ball 6… …cap

Claims (1)

[Scope of utility model registration request] 1. A flexible cylinder is equipped with a valve mechanism which closes a valve body biased rearward by an elastic force of a spring to a valve seat to form a closed state. A ball is movably inserted in the rear part, and by pressing the axial cylinder side part in the vicinity of the rear of the valve mechanism, the latter half part of the ball displaced to the contact state with the valve rod part is pressed. A writing instrument of a type in which the ball is moved forward, the valve rod portion is pressed and displaced forward to open the valve, and ink is led out from the ink storage portion at the rear of the shaft cylinder to the writing tip portion. Is a slightly smaller diameter than the inner diameter of the pressing portion on the side of the shaft cylinder, and has a weight that does not compress the spring due to movement within the shaft cylinder.