JPH0213192Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ink suction device for a fountain pen that has good ink suction efficiency.

Conventionally, a wide variety of ink suction devices have been considered, but in order to improve the ink suction efficiency among them, it is important to prevent ink from flowing back together with air when creating a negative pressure in an ink tank. To this end, conventionally, a hollow tube has been installed at the tip of the neck to block the ink inlet/outlet, and the ink inlet/outlet is used to discharge air from the ink tank. There are some that close the ink inlet and open the ink inlet and outlet when ink is sucked. However, in conventional devices with this structure, when writing, the tip of the tube that blocks the ink inlet/outlet is only slightly apart from the ink inlet/outlet, so the space formed by the tip of the tube and the ink inlet/outlet is Another problem was that the air during air exchange during writing once accumulates and air exchange cannot be carried out smoothly, resulting in poor ink tracking performance, that is, poor writing performance.

The present invention aims to eliminate the above-mentioned problems and provide an ink suction device with good writing performance and high ink suction efficiency. A transition tube fixed to the rear end and a spring inside the transition tube bias the vehicle backwards.
a push rod whose rear end is exposed through the hole in the transition tube and has a hole open at the tip and is movable within the transition tube; a sleeve having a flange having one hole in the center and the other hole spaced apart from the one hole and through which ink and air flow; A bulging part is provided at the rear end to be held at the peripheral edge of one hole of the flange of the sleeve, and is located inside the shaft cylinder and the hole of the push rod, and loosely fits into one hole of the flange. A fountain pen consisting of an air exhaust pipe that falls under its own weight as the sleeve moves, and the piece blocks the ink inlet/outlet, and an ink tank formed by the space between the inner wall of the shaft cylinder, the inner wall of the sleeve, and the hole of the push rod. This is an ink suction device.

In this invention, the ink tank is formed by the space between the inner wall of the shaft cylinder, the inner wall of the sleeve, and the hole in the push rod, so by pressing the push rod when sucking ink, the push rod and sleeve move, and the volume of the ink tank increases. Decrease. The amount of change in the pressure inside the ink tank (the amount of change in the volume of the ink tank), which is the ink suction force, is large considering the small amount of movement of the push rod, and a large amount of ink can be pumped into the ink tank with one operation of the push rod. Can be inhaled.

Normally, the pieces are always spaced apart, so air exchange into the ink tank during writing is performed smoothly, resulting in good writing performance. Furthermore, when ink is being sucked in, the bridge blocks the ink inlet/outlet, so no backflow of ink occurs and the ink suction performance is good.

Embodiments of the invention are explained in the drawings.

Inside the neck 2 at the tip of the barrel 1, there are provided a pen 3 and a pen core 8 in which a pen inner core 7 is attached to a pen core main body 6 having an ink groove 4 and an air groove 5, and the pen core 8 has an inner core 7 attached to the pen core body 6, which has an ink groove 4 and an air groove 5. has an inner wall projecting inward, and is provided with an ink inlet/outlet 10 having a slope 9.

The rear end (upper side in the drawing) of the shaft tube 1 is open, and a transition tube 13 having a hole 12 in the center of the bottom portion 11 is screwed to the rear end. A push rod 15 is provided inside the push rod 15, which is urged by a spring 14 installed inside the rear end of the shaft cylinder 1, and whose rear end (upper side in the drawing) is exposed through the hole 12 of the tail cylinder 13.

An open hole 16 is provided at the tip of the push rod 15 (lower side in the drawing), and the push rod 15 can move closely against the inner wall of the barrel 1, and an air discharge pipe 17 is inserted therethrough for discharging air during ink intake. A cylindrical sleeve 21 is fixed thereto, provided with a flange 20 having one central hole 18 for the flow of ink and air around the flange 20.

The ink tank 22 includes the slope 9 of the ink inlet/outlet 10, the inner wall of the shaft cylinder 1, the inner wall of the sleeve 21, and the push rod 1.
It is formed by the space obtained by the hole 16 of No. 5.

An air exhaust pipe 17 is inserted through one hole 18 of the flange 20 of the sleeve 21.

The air discharge pipe 17 has a piece 23 at its tip (lower side in the drawing) that can block the ink inlet/outlet 10.
A wall of an air exhaust pipe 17 is provided on the rear end of the sleeve 21 to abut against the flange 20 of the sleeve 21 and project outward to keep the piece 23 away from the ink inlet/outlet 10 at all times. A bulge 24 is provided. The rear end of the air discharge pipe 17 is located in the hole 16 of the push rod 15, the bulging part 24 is held by the flange 20 of the sleeve 21, and the piece 23 is spaced apart from the ink inlet/outlet 10 and loosely fitted into the sleeve 21. Retained.

A cover tube 25 is screwed into the shaft tube 1 except when ink is being sucked.

Although the ink suction device of this embodiment is integrally formed as a fountain pen, it may be formed separately as a cartridge type ink suction tube.

Next, the ink suction operation will be explained. First, remove the cover tube 25 from the neck 2 at the tip of the shaft tube 1,
With the pen 3 facing downward, the tip of the neck 2 is immersed in the ink, and the push rod 15 is pressed toward the tip of the barrel 1.
A piece 23 provided on the air discharge pipe 17 moves the push rod 15 a distance greater than the distance from the ink inlet/outlet 10. Then, the air exhaust pipe 17 falls under its own weight, and the end face of the piece 23 comes into contact with the slope 9 of the ink inlet/outlet 10 to close the ink inlet/outlet 10 (FIG. 2). Thereafter, the piece 23 closes the ink inlet/outlet 10, so that the ink sucked into the ink tank 22 does not flow back through the ink inlet/outlet 10, and the air in the ink tank 22 passes through the air exhaust pipe 17 to the barrel 1. Can be excluded outside. next,
When the push rod 15 is released from the pressure, the spring 14
In the process of returning the push rod 15 and the sleeve 21 to their original positions due to the elasticity of the air, the flange 20 of the sleeve 21 collides with the bulge 24 of the air exhaust pipe 17, so that the air exhaust pipe 17 also returns to its original position. The piece 23 unblocks the ink inlet/outlet 10, and ink enters the ink tank 22 from the ink inlet/outlet 10 due to the negative pressure in the ink tank 22. The ink tank 22 can be filled with ink by repeating the above operation several times.

Since the present invention has the above-described structure, the ink does not flow backwards when ink is sucked in, so ink can be filled into the ink tank by repeating the vertical movement of the push rod several times. The writing performance is good because the changeover is done smoothly.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view showing a state in which the piece blocks the outlet of the ink tank, and Fig. 3 is an enlarged end view of the - part in Fig. 2. . 1...Axis cylinder, 11...Bottom, 12...Hole, 13
... Tail tube, 14 ... Spring, 15 ... Push rod,
16... Hole, 17... Air exhaust pipe, 18...
One hole, 19...other hole, 20...flange, 21...sleeve, 22...ink tank,
23...piece, 24...bulge.

Claims (1)

[Scope of Claim for Utility Model Registration] a. A barrel 1 having an ink inlet/outlet 10; b. A transition tube 13 having a hole 12 in the bottom 11 and fixed to the rear end of the barrel 1; c. It is urged rearward by the spring 14, and the rear end is exposed through the hole 12 of the transition piece 13.
a push rod 15 having a hole 16 opened at its tip and movable within the transition tube 13; d a push rod 15 movable in close contact with the inner wall of the shaft tube 1;
A flange 20 is fixed to the tip of the flange 20 and has one hole 18 in the center and the other hole 19 spaced apart from the one hole 18 through which ink and air flow.
A sleeve 21 having e, a piece 23 capable of closing the ink inlet/outlet 10 of the barrel cylinder 1 is fixed to the tip, and a bulge 24 held at the peripheral edge of one hole 18 of the flange 20 of the sleeve 21 is attached to the rear. The sleeve 2 is provided at the end, is located inside the shaft cylinder 1 and in the hole 16 of the push rod 15, and loosely fits into one hole 18 of the flange 20, so that the sleeve 2
The piece 23 falls under its own weight due to the movement of the piece 1, and the space formed by the air exhaust pipe 17 that closes the ink inlet/outlet 10, and the inner wall of the shaft cylinder 1, the inner wall of the sleeve 21, and the hole 16 of the push rod 15. An ink suction device for a fountain pen consisting of an ink tank 22.