JPS5914234Y2 - Cartridge type writing instrument - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a cartridge-type writing instrument, which has a pen body such as a ball tip at the tip, and a barrel is placed over a cartridge containing ink inside.

Conventionally, this type of cartridge-type writing instrument had a thin rear shaft, a screw was formed at its base, and a screw was also formed on the inner surface of the tip of the barrel barrel, and the two were screwed together to form one unit. Because of this, the wall must be thicker than the outer diameter of the rear shaft, and a gap is inevitably formed between the inner surface of the barrel cylinder and the outer surface of the rear shaft of the cartridge. The disadvantage was that the amount of filling was small.

In this invention, the outer diameter of the rear shaft of the cartridge is formed to be almost the same as the inner diameter of the barrel cylinder, and the cartridge is inserted by holding the rear end of the rear shaft of the cart at the rear end of the barrel, and pressing the knock at the rear end of the barrel. This eliminates the drawbacks of the conventional method by allowing the retainer to be removed and replaced.

Next, an embodiment of the present invention shown in the accompanying drawings will be described.

1 is a cartridge with a ball chip 2 attached to its tip and ink inside; 1a is a front shaft; and 1b is a rear shaft.

The outer diameter of the rear shaft 1b is slightly smaller than the inner diameter of the shaft tube 3 so that it can be easily inserted into the shaft tube 3, and only the base portion is tightly fitted into the shaft tube 3.

A tail plug 4 is fitted and fixed to the rear end of the rear shaft 3, and engagement protrusions 4a are formed on both sides of the rear end of the tail plug.

A cylindrical tail cap 5 is fitted and fixed to the rear end of the shaft cylinder 3, and a flange 5a is formed on the intermediate inner surface of the tail cap 5.
A spring 7 is interposed between the upper surface of the collar 5a and the lower surface of the knock 6, and a pair of locking pieces 8 having outward elasticity are fixed on both sides of the tip of the knock 6, and the tips are pushed inward. It is bent to form a locking part 8a, so that when the knock 6 is pushed rearward by the spring and is in the rear position, it does not protrude from the rear end of the tail crown 5, and the locking piece 8 is retracted into the tail crown 5. Both sides are pushed inward and the locking portion 8a engages with the engagement protrusion 4a of the tail plug.

Therefore, even if the front shaft 1a of the cartridge 1 is pulled, it will not come off.

When the ink in the cartridge 1 runs out and you want to replace it with a new one, push the knock 1 forward against the elasticity of the spring 7 as shown in Figure 2, and the locking piece 8 will gradually come out from inside the tail crown 5 and move outward. The expanding locking portion 8a is disengaged from the engagement protrusion 4a.

Therefore, the cartridge 1 can be pulled out forward by holding the front shaft 1a.

Next, insert a new cartridge into the barrel, push the tail plug 4 into the open locking piece 8, and loosen the knock 8. The knock 8 returns to the rear with the spring 7, and the locking piece 8 moves into the tail crown 8. The locking portion 8a engages with the engagement protrusion 4a of the tail plug 4, and the cartridge 1 is pulled and fixed rearward as shown in FIG.

According to the present invention, since the rear end of the cartridge rear shaft is attached to and detached from the rear end of the barrel, the outer diameter of the cartridge rear shaft can be inserted into the barrel with just the slightest amount of space, making it possible to increase the amount of ink filled. Furthermore, the cartridge can be removed by simply pressing the knock, and the cartridge can be fixed by simply loosening the knock, so it has the practical effect of making the cartridge attachment and removal operations extremely simple.

In addition, the engagement protrusions on the rear end of the tail plug may not be on both sides, but may be on the entire circumference.
Three or more locking pieces may be provided instead of one pair, a leaf spring may be used instead of a spring, the tail plug and cartridge may be formed integrally, or the tail crown and shaft cylinder may be integrally formed. Even if a different pen body is used in place of the ball tip, the gist of the present invention will not be changed in any way.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figure 1 is a cutaway front view of the main part when the cartridge is fixed, Figure 2 is a front cutaway view of the main part when the knock of Figure 1 is pressed, and Figure 3 is a cutaway front view of the main part when the knock of Figure 1 is pressed. The figure is a perspective view of the knock and the locking piece. 1... Cartridge, 1a... Front shaft,
1b... Rear shaft, 2... Ball tip,
3...Shaft cylinder, 4...Tail plug, 4a...
...Engagement protrusion, 5...Tail crown, 6...
Knock, 7... Spring, 8... Locking piece, 8a... Locking part.

Claims (1)

[Scope of utility model registration request] An engaging protrusion is formed on the side of the rear end of the cartridge, which has a pen body at the tip and contains ink inside, and the rear of the cartridge is inserted into the barrel, and a knock is moved in the axial direction at the end of the barrel. A locking piece having outward elasticity is fixed to the tip of the knock, and the knock is constantly pulled rearward by an elastic member, so that when the knock is located at the rear, the locking piece is pushed inward. The cartridge is held in such a way that it engages with the engagement protrusion on the rear end of the cartridge to hold the cartridge, and when the knock is positioned forward, the locking piece opens outward by its own elasticity and comes off from the engagement protrusion of the cartridge. Cartridge type