JPS6345338Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a capless writing instrument that is convenient to use and carry.

In general, Mannen pens have a cap on the tip of the barrel to protect the nib and prevent the ink from drying out, but it is inconvenient to remove the cap each time and fit it into the rear end of the barrel. There is,
In addition, since there is a risk that the barrel and cap may separate during carrying and stain clothes, a cap-less Mannen pen has been proposed, but the previous ones had a blockage in the opening at the tip of the barrel. A plate is attached and a spring is applied from the back side to close the opening, or the tip of the shaft cylinder is divided on both sides and the divided pieces are closed by a connecting plate spring. In any case, when in use, the pen tip is drawn out from the barrel, and the drawn out pen tip pushes open the closing plate or split piece, which may damage the pen tip, and the pen tip may be damaged if used repeatedly. As a result, the force of the spring weakens, and the sealing performance of the opening of the barrel deteriorates, and the inside of the barrel is exposed to outside air, causing the ink to dry and become unusable.

This idea was devised to solve the problems of the conventional products mentioned above.A shutter guide is installed inside the front barrel, and a soft material is made between the legs on both sides and the inner surface of the front barrel. A shutter member having a window hole for entering and exiting the pen tip is slidably disposed in the pen unit, and this shutter member is connected to a guide tube that is removably fitted to the pen unit, and the shutter is moved through the guide tube that moves together with the pen unit. The opening of the barrel is opened and closed by sliding parts, which protects the pen tip and effectively prevents ink from drying out. Moreover, this writing instrument can be applied not only to Mannen pens but also to ballpoint pens and felt pens. This is what we provide.

Examples thereof will be described below with reference to the drawings. In FIGS. 1A and 1B, 1 is the front barrel of the writing instrument, which has an opening 1a with a required diameter at the front end, a joint fitting 1b attached to the rear end, and a second As shown in Figures B and C, an annular collar 2a at the rear end whose outer diameter matches the inner diameter of the front shaft cylinder 1;
A shutter guide 2 consisting of a pair of legs 2b extending horizontally forward from both sides of the front surface and having a cylindrical outer surface and an opposing inner surface and a semicircular front end is located between the front end and the shaft cylinder opening. They are press-fitted with a slight interval between them, and between the leg portions 2b on both sides and the inner surface of the front shaft cylinder 1, there are a number of rubber or synthetic resin materials as shown in Fig. 2A. A bendable shutter member 3, which has a horizontal fin piece 3a, has a semicylindrical shape of a required length, and has a vertically elongated window hole 3b for pen entry and exit in the center of the rear half, is arranged along the upper and lower surfaces of both side legs 2b. The shutter member 3 is slidably disposed, and when the writing instrument is not in use, the window hole 3b of the shutter member 3 is positioned on the upper surface side of both side legs 2b by a guide tube 4, which will be described later, and the front half without the window hole 3b is moved. The front end opening 1a of the front shaft cylinder 1 is closed by the portion. In addition, the inner rear half of the front barrel 1 is composed of an annular collar 4a having a diameter slightly smaller than the inner diameter of the front barrel 1 and a cylindrical portion 4b extending forward from the front surface thereof, as shown in FIGS. 2D and 2E. The inner hole of the brim 4a has a key groove 4c for preventing rotation of the pen unit, and a guide tube 4 provided with a protrusion 4d on the front end of the tube portion 4b is disposed so as to be movable back and forth. The front end portion of the shutter guide 2 is fitted between the annular collar 2a and the opposing inner surfaces of the leg portions 2b on both sides, and the cylindrical portion 4
The protrusion 4d on the shutter member 3 is fitted into the recess 3c on the lower surface of the back of the head of the shutter member 3.
is connected to. A spring 5 of a required strength is interposed between the annular flange 2a of the shutter guide 2 and the annular flange 4a of the guide tube 4, and the spring force of the spring 5 moves the guide tube 4 in the backward direction. Therefore, the cylindrical portion 4
The shutter member 3 is pulled rearward through the protrusion 4d on b, and the shutter member 3 is placed in the unused state as described above.

Reference numeral 6 in FIG.
As is well known, a pen core 7 is inserted into the inside of the pen core 7 in a penetrating state, and a pen nib 7a is attached to the front end, and an ink storage cylinder 8 connected to the pen core 7 is inside the large diameter cylindrical portion 6b. The small diameter cylindrical part 6
a is inserted into the front shaft cylinder 1 from the joint metal fitting 1b side and fitted into the guide cylinder 4, and the rotation prevention protrusion 6c at the rear end of the small diameter cylinder part 6a engages with the key groove 4c of the collar 4a of the guide cylinder 4. At the same time, the front end surface of the large diameter cylindrical portion 6b comes into contact with the brim 4a, and the pen unit 6
is attached to the front shaft cylinder 1 as shown in FIG.

Reference numeral 10 denotes a rear barrel with a cam barrel 9 integrally mounted inside and a base of a clip 11 attached to the rear end. It can be detachably attached to the

Inside the cam cylinder 9, as is also well known, a knock bar 13 is disposed to protrude rearward and includes a rotating cam member 12 and a slide cam 13a that engage with a plurality of cam protrusions 9a. The rear end surface of the pen unit 6 is brought into contact with the front end surface of the pen unit 6 by the action of a spring 5 in the front barrel 1.

3 shows an unused state in which the pen tip 7a is accommodated in the front barrel 1. In this state, if the rear end of the knock bar 13 is pressed, the pen unit 6 is inserted through the rotary cam member 12. is moved forward against the spring force of the spring 5 in the front shaft cylinder 1, but at this time, the guide cylinder 4 on the small diameter cylinder part 6a is also moved forward together, so that the guide cylinder 4 The flexible shutter member 3 connected by the upper projection 4d is guided by the legs 2b on both sides of the shutter guide 2 and slides downward along the inner surface of the front end of the front barrel 1, as shown in FIG. 4A. When the pen tip 7a approaches the front end opening 1a, the window hole 3b of the shutter member 3 opens the opening 1a, and as the pen unit 6 continues to extend, the pen tip 7a passes through the window hole 3a of the shutter member 3. The rotary cam member 12 protrudes from the opening 1a of the front shaft cylinder 1, and as shown in FIG.

In addition, in the usage state shown in Fig. 5, the knock bar 1
When the rotating cam member 12 and the cam protrusion 9a are released from the locked state through the third operation, the pen unit 6 and the guide barrel 4 move back due to the restoring action of the spring 5 in the front barrel 1, and the shutter member 3 also moves back. The pen tip 7a is drawn backward by the guide tube 4, guided by the legs 2b on both sides of the shutter guide 2, and slid upward, and when the pen tip 7a passes the opening 1a and the window hole 3a, it enters the front half without the window hole 3a. Therefore, the opening 1a of the front shaft cylinder 1 is closed, and the state returns to the unused state shown in FIG. 3.

In the above example, a Mannen pen is shown as the pen unit 6, but the pen unit 6 is not limited to this, and the guide tube 4 in the front shaft tube 1 has a ball 7 at the tip as shown in FIG. 5A.
By attaching a pen unit 6' with a felt pen 7a' at the tip and a pen unit 6'' with a felt pen 7a'' at the tip as shown in the figure (b), it can be used as a ballpoint pen or a felt pen. It is not limited to the knock type type, but may also be a rotating type type. Further, the front end portion of the front shaft cylinder having the opening 1a may be made integral as shown in the figure.
Due to the construction, it may be attached as a separate part.

As described above, in this invention, the shutter guide 2 is mounted inside the front barrel 1 which has an opening 1a at the front end, and a soft material is placed between the both side legs 2b of the shutter guide 2 and the front barrel 1. consisting of many horizontal fin pieces 3
A shutter member 3 having a window hole 3b for entering and exiting the pen tip in the rear half is slidably disposed, and a guide barrel 4 is movably disposed in the rear half of the front barrel 1 by being biased backward by a spring. The front end of the guide tube 4 is connected to the rear end of the shutter member 3, and the opening 1a of the front shaft tube 1 is closed by the shutter member 3 when not in use. 6, 6', and 6'' are removably fitted together, so there is no need for a cap, which saves the trouble of attaching and detaching the cap each time you use or carry it, making it convenient to handle. Since the member is not pushed open by the pen tip, it can sufficiently protect the pen tip, and the shutter member does not close the opening of the barrel with a special bullet, so it can be used repeatedly. It can effectively prevent ink drying without changing the sealing function even if
By appropriately changing the pen unit, it can be used as a variety of writing instruments, and has the advantage of having a good appearance.

[Brief explanation of the drawing]

Figure 1A is a sectional view of the front barrel. The same figure is a side view of the pen unit. FIG. 2A is a perspective view of the shutter member. The same figure is a perspective view of the shutter guide. Figure C is the left front view. 2 is a perspective view of the guide tube. The same photo is the front view on the right side. Figure 3 is a sectional view of the entire writing instrument.
FIGS. 4A and 4B are partially cutaway side views showing the operating state thereof. Figures 5A and 5B are side views of other examples of the pen unit. In the figure, 1...front barrel, 1a...opening, 2...shutter guide, 2a...annular rib, 2b...leg, 3...shutter member, 3a...lateral fin piece,
3b... Window hole, 4... Guide tube, 4a... Annular collar, 4b... Cylindrical portion, 4d... Protrusion, 5... Spring, 6, 6', 6''... Pen unit, 7... Pen core , 8... Ink storage cylinder, 10... Rear shaft cylinder.

Claims (1)

[Scope of utility model registration request] The shutter guide 2 is installed inside the front shaft cylinder 1 which has an opening 1a at the front end, and the shutter guide 2
A shutter member 3 made of a soft material and having a large number of side fin pieces 3a and a window hole 3b for pen tip entry and exit in the rear half is slidably disposed between the both side legs 2b and the front barrel 1. A guide tube 4 is disposed in the rear half of the front shaft tube 1 so as to be movable with a spring bias toward the rear.
The front end of the shutter member 3 is connected to the rear end of the shutter member 3, and the opening 1a of the front barrel 1 is closed by the shutter member 3 when not in use. A capless writing instrument characterized by being removably fitted.