JPH0435190Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a marking pen using liquid ink, which has a valve device interposed between a liquid tank and a tip application member such as a pen core or a brush. The present invention relates to liquid applicators such as writing instruments or cosmetic tools using liquid cosmetics such as nail polish.

[Conventional technology]

In conventional liquid applicators of this type, the opening and closing of the valve is performed by, for example, a knob operation, but even when the valve is opened, the opening area of the valve is limited throughout the entire process of the knob operation. The displacement air volume and liquid flow rate passing through the opening were also approximately constant. Therefore, for example, if you want to increase the amount of liquid supplied to the tip application member by requiring a large amount of coating, the only way to do so is to increase the opening time of the valve, that is, to increase the length of time the valve is kept open. There were problems in that it was difficult to adjust the supply amount, and it was also difficult to estimate the supply amount, resulting in an inappropriate supply amount.

[Problem that the invention attempts to solve]

The purpose of the present invention is to provide a new liquid applicator that can freely adjust the amount of liquid supplied from the liquid tank through the valve device to the distal applicator by easy operation, making it easy to appropriately control the amount of liquid supplied. be.

[Means for solving problems]

The liquid applicator of the present invention devised to achieve the above object includes a valve device interposed between the liquid tank and the tip applicator, and a spring attached to the valve stem that opens and closes the valve seat in the valve device. A valve spring is installed in which spring parts with different sizes of constants are arranged in series, and during the compression stroke of the valve spring due to movement of the valve stem by the knob operation, the spring part with a small spring constant finishes compression and the spring constant changes. When the valve stem has moved to the transition point where only the large spring part shifts to compression, the edge of the valve stem is set at the same position as the opening edge on the liquid tank side of the valve seat, and the spring part with a large spring constant is removed from the same position. The valve stem is characterized by having a required shaped part on the valve stem that can expand the distance between it and the valve seat in the range up to the required position of the valve stem passing through the opening edge of the valve seat during the stroke where the chisel is compressed. configured.

〔Example〕

An illustrated embodiment of the present invention will be described in detail below. This embodiment is a type of writing instrument in which a valve is opened by tapping a pen core 1, which is a tip applicator. A valve device consisting of a spring receiver 3, a valve seat 4, a valve stem 5, and a valve spring 6 is narrowly fixed in the hole by a tip shaft 7 screwed onto the tip of the shaft cylinder 2, and the tip of the valve stem 5 is fixed. A pen core 1 that is movable in the axial direction within a tip shaft 7 is connected to the pen core 1. In addition, 20 in the figure is a cap.

Next, the main parts will be explained (see FIGS. 1 to 3). The valve stem 5 mounted to pass through the valve seat 4 has a tapered portion 9 approximately in the center thereof that can come into contact with the opening edge 8 of the valve seat 4 on the liquid tank side in a watertight manner.
Further, in front of the tapered part 9, there is a cylindrical part 10 with an open end surface, and at an opposing point 180° apart on the periphery of the cylindrical part 10, there is a cylindrical part 10 extending a predetermined distance from the leading edge to a rear position in the axial direction. Two slits 11 and 11' are provided, and a stepped shaft part 12 is further provided behind the tapered part 9.
have. Of course, the cylindrical portion 10 at the tip of the valve stem 5 passes through the valve seat 4 and projects into the inner hole of the tip barrel 7, and connects the tip to the rear end surface of the pen core 1. The stepped shaft portion 12 has a coiled valve spring 6 attached to its outer periphery, and a rear end small diameter portion 13 is inserted into the rear end cylindrical portion 14 of the spring receiver 3. The valve spring 6 has its front end abutted against the front end stepped portion 15 of the stepped shaft portion 12 and also abutted against the front end surface of the rear end cylindrical portion 14 of the rear end spring receiver 3 to constantly press the valve stem 5 forward. Therefore, the taper part 9 of the valve stem 5 always seats on the valve seat 4 and opens the valve seat 4 in the no-external pressure state, that is, in the non-knocked state. When the barrel 2 is pressed while the pen core 1 is in contact with the valve spring 6, the pen core 1 moves relatively backward and knocks the valve stem 5, and the valve stem 5 is pushed against the valve spring 6 and retreated, causing its tapered portion 9 to move back. is pulled away from the valve seat 4 to open the valve seat 4. The valve spring 6 is connected in series with a spring portion 16 having a large coil diameter and a small spring constant in the front half, and the wire diameter of the coil is the same as that of the spring portion 16 having a small spring constant in the front half. The spring portion 17 has a small coil diameter and a large spring constant. Therefore, when the valve stem 5 is moved back and the valve spring 6 is compressed, all the spring parts start to be compressed at the same time, but first the spring part 16 in the front half, which has a smaller spring constant, starts to be compressed.
The entire compression stroke is completed first, and then the compression stroke of only the spring portion 17 having a large spring constant in the latter half is started. From the end of the entire compression stroke of the spring 16 with a small spring constant, the spring part 17 with a large spring constant
When the valve stem 5 moves to the transition point where it shifts to the compression stroke, the rear end opening edges 18, 18' of the slits 11, 11' provided in the tip cylinder part 10 of the valve stem 5 become tight, causing the valve seat 4 to tighten. The dimensions of the required parts such as the length of the slits 11, 11' are set so that they are located at the same point as the opening edge 8 on the liquid tank side. Note that 19 in the figure is a sponge body that absorbs excess ink that has passed through the valve.

In the above embodiment, the valve spring 6 is integrally molded, but an embodiment in which two separate coil springs having different coil diameters are connected is also possible. It is also possible to use a combination of two coil springs having the same coil diameter but different wire diameters. The structure of the valve spring is not limited to these, as long as spring parts having different spring constants are arranged in series.

Further, in the above embodiment, the valve rod 5 moves to a transition point where the compression stroke of the spring portion 16 with a small spring constant of the valve spring ends and shifts to the compression stroke of only the spring portion 17 with a large spring constant, and the subsequent As a means for expanding the gap between the valve seat 4 and the valve stem 5 during the knock stroke to increase the amount of replaced air and the amount of liquid flowing, the valve stem 5 is provided with a cylindrical portion 10 and slits 11, 11' are provided in the peripheral wall thereof.
Although the valve stem 5 and valve seat 4
The present invention is not limited to this, as long as the space between the holes can be expanded to increase the amount of displaced air and the amount of liquid flowing; for example, holes may be provided in place of the slits 11 and 11';
It is possible to use embodiments such as one in which an axial groove is provided on the outer surface portion without a cylindrical shape, or one in which the outer diameter of the valve stem is reduced.

Furthermore, in the above embodiment, the valve stem 5 is actuated by notching the pen core 1 at the tip, but of course, a notching member is provided at the rear end of the barrel 2, and the valve stem 5 is actuated by the notching of the rear end. Activated embodiments are of course also possible.

[Effect]

Next, the operation will be explained based on the drawings (FIGS. 1 to 3) of the above embodiment. First, when the pen core 1 is in the non-knocked state, the valve stem 5 does not move and the taper part 9 of the valve stem 5 does not move.
is watertightly seated on the opening edge 8 of the valve seat 4 on the liquid tank side and maintains the open state (see Fig. 1). Next, when the pen core 1 is clicked and the valve stem 5 is moved backward, a gap is created between the valve stem 5 and the valve seat 4, allowing the circulation of replacement air and ink. The spring portion 16 in the front half having a smaller spring constant completes its entire compression stroke. Figure 2 shows exactly the valve spring 6.
This figure shows a state in which the valve rod 5 is located at a transition point where the compression stroke of the spring portion 16 with a small spring constant ends and the compression stroke of only the spring portion 17 with a large spring constant in the latter half ends. When the pen core 1 is further tapped from the state shown in FIG.
Since it penetrates into the liquid tank side from the opening edge 8 on the liquid tank side (see Fig. 3), in addition to the space between the inner surface of the valve seat 4 and the outer surface of the valve stem 5, the slits 11 and 1
The gap is enlarged by the cross-sectional area of 1' and the cross-sectional area of the inner hole of the cylinder 10, so that the amount of displacement air passing through this gap and the amount of ink flowing out can be increased. In order to increase the amount of ink flowing out, it is necessary to compress only the spring portion 17 of the valve spring 6, which has a large spring constant, and the knocking force required for this is naturally larger than the knocking force required for the previous compression. The difference in knocking force will be perceived by the user of the writing instrument as a response, and the user will be able to estimate and adjust the amount of ink flowing out while sensing this difference in response.

[Effect of idea]

The present invention has the above-described structure and operation, and increases or decreases the amount of liquid supplied from the liquid tank to the distal application member through the valve device by detecting the difference in the force required to apply the knob. This can be adjusted by varying the strength of the force, which makes it extremely easy to adjust the amount of liquid supplied to the tip application member, and has the effect of making it easier to optimize the amount of liquid supplied.

[Brief explanation of drawings]

The figure shows a writing instrument which is an embodiment of the present invention.
This shows a state in which the valve spring is knocked down to the transition point from compression of the spring portion with a small spring constant to compression of only the spring portion with a large spring constant, and a knocked state in the compression stroke of only the spring portion of the valve spring with a large spring constant. FIG. 4 is an enlarged cross-sectional view of the main part, and is a cross-sectional view showing the entire writing instrument. 1... Pen core, 2... Barrel, 3... Spring holder,
4... Valve seat, 5... Valve stem, 6... Valve spring, 7...
Tip shaft, 8...Opening edge on the liquid tank side of the valve seat, 9...
...Tapered part, 10...Cylinder part, 11, 11'...Slit, 12...Stepped shaft part, 13...Rear end small diameter part, 14...Rear end cylinder part, 15...Step part, 16... …
Spring part with a small spring constant, 17... Spring part with a large spring constant, 18, 18'... Rear opening edge of the slit, 19... Sponge body, 20... Cap.

Claims (1)

[Scope of utility model registration request] A valve device is interposed between the liquid tank and the tip application member, and in the valve device, a valve spring consisting of spring parts with different spring constants of different sizes is attached to the valve stem that opens and closes the valve seat. , during the compression stroke of the valve spring due to the movement of the valve stem by the knob operation, the valve stem has moved to the transition point where the compression of the spring part with a small spring constant ends and the compression of only the spring part with a large spring constant starts. The edge of the valve stem is set at the same position as the opening edge of the valve seat on the liquid tank side, and only the spring portion with a large spring constant passes through the opening edge of the valve seat during the compression stroke. A liquid applicator, such as a writing instrument or a cosmetic tool, characterized in that the valve stem is provided with a predetermined shaped part that can enlarge the distance between the valve stem and the valve seat, up to a predetermined position of the valve stem.