JP2588020B2 - Capless writing instrument - Google Patents

Description

The present invention relates to a capless writing instrument.

b.Conventional technology In a capless writing instrument using evaporative ink such as water-based ink, in a state where the writing material is stored, the ink outlet portion at the tip of the writing material and the air hole formed in the shaft portion are inside the case. Must be sealed.

Thus, in such a writing instrument, a seal member is provided on the inner surface of the base of the case, the seal member is brought into close contact with the writing body, a lid is provided at the opening of the case, and the lid is pushed by the tip of the writing body. A mechanism is provided in which the tip of the cursive is projected out of the case while opening, and the opening is closed again with a lid as the tip of the cursive is stored in the case.

c. Problems to be Solved by the Invention By the way, as the mechanism for closing the case opening, a flat plate lid is disposed at the case opening by a biasing means such as a spring, or a flat plate or a ball is disposed around the opening. It was attracted by a permanent magnet.

However, in the former case, during repeated pushing and opening of the lid with the tip of the cursive writing, linear abrasion occurs on the lid, which not only reduces the sealing property of the lid but also damages the tip of the cursive writing. In the latter case, if the ball or the like separates from the magnet, the opening may remain open.

Therefore, an object of the present invention is to provide a capless writing instrument that can achieve stable sealing properties over a long period of time and has no risk of damaging the tip of the writing body.

d. Means for Solving the Problems In the capless writing instrument of the present invention, a case having a first opening at the tip, a second opening provided in the case, and a second
An inner cylinder having an opening, a writing body disposed in the inner cylinder so as to be movable in the axial direction, and fitted on the outer periphery of the inner cylinder,
One end is locked to the base of the inner cylinder, the other end is extended to the second opening, and the other end of the coil spring is supported by the other end of the coil spring. A rolling element for closing the opening of the writing body, when the writing body is moved to project the tip of the writing body to the outside of the case through the second opening and the first opening, The rolling element is pushed back by the tip, and when the tip of the writing body is returned to the inner cylinder, the rolling element is returned by the urging force of the spring, and the second opening is closed again. .

e. Embodiment FIG. 1 shows an aqueous ballpoint pen as a writing instrument according to the present invention.

This ball-point pen case 1 is composed of a distal end portion 1a, an intermediate portion 1b, and a proximal end portion 1c. The distal end portion 1a is fitted to the intermediate portion 1b, and the intermediate portion 1b is screwed to the proximal end portion 1c. Are integrated. Tip 1a is open at the tip (first opening)
Two. The intermediate portion 1b has an inner cylinder 3 extending into the distal end portion 1a. The inner cylinder 3 has a flat end surface 3a, and an opening (second opening) 4 is formed in the flat end surface 3a.
The flat end surface 3a has an oval shape as shown in FIG. 1 (b), and is connected to the inner cylinder outer peripheral surface 3c via the inclined surface 3b.
The inner cylinder 3 is arranged concentrically with the tip 1a with an appropriate gap. And, on the outer peripheral surface 3c of the inner cylinder 3,
The coil spring 5 is loosely fitted. One end 5a of the spring 5 is fitted into a circumferential groove 3d formed at the base of the inner cylinder 3, and the other end 5b of the spring 5 extends along the generatrix of the inner cylinder 3 at the tip of the inner cylinder 3. And reaches the flat end surface 3a via the inclined surface 3b of the inner cylinder 3. At the other end of the spring 5, a resin such as polyacetal resin,
A ball 6 made of synthetic rubber such as urethane rubber, brass, metal such as stainless steel, glass, or the like is loosely fitted. The ball 6 closes the opening 4 by the urging force of a spring 5. The base end 1c has a circumferential groove 7 on the outer peripheral surface and a hole 8 on the rear end surface.

A water-based ink cartridge 9 as a cursive body is housed in a space formed by an intermediate portion 1b and a base end 1c of the case 1, and is disposed between the inner cylinder 3 of the intermediate portion 1b and the cartridge 9. The return spring 10 is biased in the proximal direction.

A push button 11 is inserted into a hole 8 formed in the base end 1c of the case 1. The end 11a of the push button 11 in the case 1 is in contact with the rear end surface of the cartridge 9. The diameter of the end 11a is larger than the diameter of the hole 8 to prevent the push button 11 from falling out of the case 1. Push button 11
A base end of the clip 12 is fitted to the other end of the clip. A locking claw 13 is formed at the tip of the clip 12.

 The operation of the above embodiment will be described below.

The ballpoint pen is in the state shown in FIGS. 1 and 2 when not in use. In this state, the tip 9 a of the cartridge 9 is housed in the inner cylinder 3, and the ball 6 closes the opening 4 by the urging force of the spring 5. The tip 9a and the air hole 9b of the cartridge 9 are
The ball 6 and the seal member 14 sandwiched between the intermediate portion 1b and the base end portion 1c of the case 1 are placed in a sealed state.

Push button 11 to use this ballpoint pen
When the cartridge 9 is pushed into the case 1, the cartridge 9 is pushed toward the distal end of the case 1 against the urging force of the spring 10. Then, the front end portion 9a of the cartridge 9 hits the ball 6 and tries to protrude the ball 6 toward the front end of the case 1. However, since the ball 6 rolls, the ball 6 immediately rolls off the leading end 9 a of the cartridge 9. At this time, since the coil portion 5c of the spring 5 is loosely fitted to the inner cylinder 3, not only the other end portion 5b but also the coil portion 5c is bent. Then, the ball 6 is completely pushed out of the opening 4 as shown in FIG. When the cartridge 9 is further pushed, the front end portion 9a of the cartridge 9 is projected from the opening 2 to the outside of the case 1 through the opening 4. And clip 12
When the claw 13 of the case 1 fits into the circumferential groove 7 of the case 1, it is locked there. In this state, even if the pressing force of the push button 11 is released, the cartridge 9 remains there.

In order to store the cartridge 9 in the case 1 again, the claw 13 of the clip 12 may be removed from the circumferential groove 7 of the case 1.
Then, the tip 9 a of the cartridge 9 is pulled into the inner cylinder 3 of the case 1 by the urging force of the spring 10. Along with this, the ball 6 is also returned by the urging force of the spring 5 and closes the opening 4 again.

In the above embodiment, as the locking means of the cartridge 9, the circumferential groove 7 is formed in the case 1 and the locking claw 13 is formed in the clip 12, but in the present invention, other known locking means is used. May be adopted.

Further, in the above embodiment, the ball 6 is used as the closing member of the opening 4, but the present invention is not limited to the ball 6,
It may be a cylindrical body. When a cylindrical body is employed, it is necessary to form a curved surface 3e at the center of the flat end surface 3a of the inner cylinder 3 as shown in FIG. Then, the hole 4 is formed at the center of the curved surface 3e.

Further, in the above embodiment, one end of the spring 5 is fitted into the orbital groove 3d of the cylinder 3;
Alternatively, a hole having a depth that does not penetrate the wall may be formed in the radial direction, and one end of the spring 5 may be locked in the hole.

In the above embodiment, the ball 4 is directly in contact with the opening 4 of the inner cylinder 3 to close the opening 4, but an elastic material is provided in the opening 4, and the ball 6 contacts the elastic material. Let's open 4
If the is closed, the sealing performance is further improved.

Further, in the above embodiment, as shown in FIG. 3, when the ball 6 is pushed down, it is in a state of being close to the inner surface of the tip 1a of the case 1;
If a hole is formed in the wall, the ball 6 can escape into the hole. In other words, the shaft diameter of the writing instrument can be reduced.

In the above embodiment, the water-based ball-point pen has been described. However, the present invention is not limited to the ball-point pen, but may be applied to other writing instruments such as a fountain pen and a felt pen.

f. Effects of the Invention As described above, in the capless writing instrument according to the present invention, the opening is closed by the rolling element, and the rolling element is supported by the end of the coil spring fitted in the inner cylinder. When the tip of the writing body abuts, the rolling element rotates and escapes immediately, so that the rolling element is less likely to be worn, so that a long-term sealing effect is ensured.

[Brief description of the drawings]

FIG. 1 (a) is a cross-sectional view of a capless writing instrument according to the present invention, FIG. 1 (b) is a view showing a distal end surface of an inner cylinder thereof, and FIG.
FIG. 3 and FIG. 3 are partial cross-sectional overall views showing the protruding state and the stored state of the writing body, and FIG. 4 is a perspective view showing the tip of the inner cylinder when a cylinder is employed as a rolling element. DESCRIPTION OF SYMBOLS 1 ... Case, 1a ... Top part, 1b ... Middle part, 1c ... Base end part, 2 ... 1st opening, 3 ... Inner cylinder, 3a ... Flat end face, 3b ... Inclined surface, 3c ... outer peripheral surface, 4 ... second opening, 5 ... spring, 5a ... one end, 5b ... coil part, 5c ... other end, 6 ... ball, 7 ... circumferential groove, 8 … Hole, 9… Cartridge, 9a… Tip, 9b… Air hole, 10… Return spring, 11… Push button, 12… Clip, 13… Locking claw, 14… Seal member .

Claims (1)

(57) [Claims] 1. A case having a first opening at a distal end, an inner cylinder disposed in the case and having a second opening at a distal end,
A writing body disposed in the inner cylinder so as to be movable in the axial direction thereof, fitted on an outer periphery of the inner cylinder, one end is locked to a base of the inner cylinder, and the other end is the second A coil spring extending to the opening; and a rolling element supported by the other end of the coil spring and closing the second opening by a biasing force of the spring. The writing element is moved by moving the writing element. When projecting the tip of the body through the second opening and the first opening to the outside of the case, the tip of the writing body was pressed against the rolling element, and the tip of the writing body was returned to the inner cylinder. In this case, the capless writing implement is characterized in that the rolling element is returned by the biasing force of the spring to close the second opening again.