JPS627513Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention has an ink chamber that directly stores ink, and a valve device is interposed between the ink chamber and the pen core to control the ink flow rate. The present invention relates to a writing instrument such as a marker configured to be used as a guide, and particularly relates to an improvement of a valve device thereof.

(Prior Art) In the conventional valve device of this type of writing instrument, when the pen core is not used for writing, the pen core 1 sinks into the barrel 2 and the valve stem 3 retreats, as shown in FIG. 3, for example. The opening 5 of the valve seat 4 is closed, and the pen core 1
When writing, as shown in FIG. 4, the pen core 1 naturally protrudes from the tip opening of the barrel 2, and the valve stem 3 also moves forward to maintain the opening 5 of the valve seat 4 in an open state. It is configured.

(Problems to be Solved by the Invention) This structure in which the valve stem 3 moves during writing to maintain the open state of the valve has the following drawbacks. In other words, when the internal pressure of the ink chamber inside the barrel rises compared to the external pressure due to temperature differences, more ink than necessary flows out of the ink chamber, causing the pen core or the porous holes in the sponge etc. arranged around the outer periphery of the pen core. The problem is that the body cannot absorb it completely and it overflows from the tip of the barrel and falls off.

The purpose of the present invention is to improve the valve device of a writing instrument so that such disadvantages can be eliminated.

(Means for Solving the Problem) In order to achieve the above object, the present invention has an ink chamber for directly storing ink, and a valve device is interposed between the ink chamber and the pen core to increase the flow rate of the ink. In a writing instrument configured to adjust the amount of water, the valve stem 3 of the valve device has a first seal portion that closes the opening 5 of the valve seat 4 when the pen core 1 is in a non-writing state. 6, and then maintains an open state when transitioning from a non-writing state to a writing state, and then closes an appropriate point where the flow of ink can be stopped again in a state where the writing state is set. This is a writing instrument that is characterized by the fact that it is equipped with a.

(Function) In the present invention, when the pen core 1 is in a non-writing state, the first seal portion 6 provided on the valve stem 3 naturally closes to the valve seat 4.
to stop the flow of ink by closing the opening 5 of the
Next, when transitioning from the non-writing state to the writing state, the valve seat 4 opens to allow ink to flow, and in the state set to the writing state, the second seal portion 7 provided on the valve stem 3 again allows ink to flow. It acts to interrupt the flow. The second seal part 7 closes off the required position of the valve when it is set in the writing position, but during actual writing, it moves slightly due to the pressure of the writing and opens the valve seat appropriately to prevent the pen core from running out of ink. This is to supply ink to prevent this from occurring.

(Example) Figures 1 and 2 show an example of the present invention, in which Figure 1 is a vertical sectional view of the main part when the pen core 1 is in a non-writing state, and Figure 2 is a longitudinal sectional view of the main part when the pen core 1 is in a non-writing state. FIG. 1 is a vertical sectional view of a main part when the device 1 is set in a writable state. A pen core 1 is connected to the tip of the valve stem 3, and the valve stem 3 is movable in the axial direction through an opening 5 of a valve seat 4 fixed inside the shaft tube 2. When the pen core 1 is retracted and is in the state where it is recessed into the barrel, that is, in the non-writing state, the first seal portion 6 having a tapered surface provided on the tip side of the valve stem 3 is pressed against the valve seat by the pressure of the valve spring 8. 4 is closed (see FIG. 1). At the rear position of the first seal part 6 of the valve stem 3, when the first seal part 6 is at the point where the opening 5 of the valve seat 4 is closed, it is located slightly further rearward than the rear end of the valve seat 4. A brim-shaped second seal portion 7 is provided protrudingly at the point. In the process of moving the valve stem 3 forward from this state to protrude the pen core 1 from the tip of the barrel and transitioning to the writing position, the first seal part 6 separates from the valve seat 4 and opens the opening 5 to prevent ink from flowing. enable. When the valve stem 3 has finished advancing and the pen core 1 has fully protruded from the tip end of the barrel and is ready for writing, the second seal portion 7 of the valve stem 3 is fitted into the rear end opening of the valve seat 4 and is in a sealed state. (See Figure 2). When writing, if the second seal part 7 closes the valve, the pen core 1 will run out of ink, so if the valve stem 3 moves back slightly due to writing pressure, the second seal part 7
The position of the second seal portion 7 is appropriately set so that there is an appropriate gap between the valve seat 4 and the valve seat 4, and the required amount of ink can be supplied.

Note that the position of the valve seat where the second seal portion 7 closes is not limited to the illustrated position, for example, the position of the valve seat where the second seal portion 7 is closed is
It is also possible to have the opening 5 closed. Further, its shape can also be made in the opposite direction to that of the first seal portion 6.

(Effects of the invention) The present invention has the above-mentioned configuration, and since the valve seat opens and ink can flow only when the valve stem moves, the valve seat opens. This makes it possible to prevent accidents such as buttons falling off due to excessive ink flowing out due to internal pressure changes or other causes.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is a longitudinal sectional view of the main part when the pen core is in a non-writing state, and Figure 2 is a longitudinal sectional view of the main part when the pen core is in a writing state. FIG. Furthermore, Figures 3 and 4 show conventional examples, with Figure 3 being a longitudinal sectional view of the main part when the pen core is in a non-writing state, and Figure 4 being a longitudinal sectional view of the main part when the pen core is in a writing state. It is a longitudinal cross-sectional view of the main part. 1... Pen core, 2... Shaft barrel, 3... Valve stem, 4...
... Valve seat, 5... Valve seat opening, 6... First seal portion, 7... Second seal portion, 8... Valve spring.

Claims (1)

[Scope of utility model registration request] A writing implement having an ink chamber for directly storing ink and configured to adjust the flow rate of ink by interposing a valve device between the ink chamber and a pen core, characterized in that a valve stem in the valve device is provided with a first seal portion for closing an opening of a valve seat when the pen core is in a non-writing state, and a second seal portion is provided which maintains an open state when the pen core is transitioned from a non-writing state to a writing state, and then closes an appropriate point where the flow of ink can be stopped again when the pen core is set in a writing state.