JPS6130916B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a felt-tip pen.

In order to prevent ink from drying up, conventional felt-tip pens have a cap fitted to the tip of the shaft to cover the pen core. Therefore, the cap must be removed or refitted each time it is used or after use, and since the cap is a separate component, this procedure is extremely troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to provide a felt-tip pen that can be used to write with a simple operation and that can prevent ink from drying up after use.

In order to achieve such an object, the present invention advances a writing unit equipped with a pen core that guides ink from an ink storage body to a writing tip with respect to an outer case to a writing position, or retreats to a storage position, and also allows a writing unit to be moved when stored. The cap of the writing unit is moved forward relative to the shaft, the pen core at the tip of the shaft is retreated into the cap, and the tip of the cap is brought into contact with a sealing surface provided inside the outer case to seal the pen core. It is characterized by the fact that

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. As shown in FIGS. 1 to 5, the outer case 1 is made up of a front shaft 3 with a tapered end and an opening 2 at the front end, and a rear shaft 5 equipped with a clip 4 on the rear side. The case 1 is separably connected via a cam cylinder 28, which will be described later, so that the front shaft 3 and the rear shaft 5 can rotate relative to each other.

A writing unit 6 is provided within the outer case 1 so as to be movable between a writing position (see FIG. 1) and a storage position (see FIG. 9). The case 7 of this writing unit 6 consists of a shaft 10 equipped with a tail plug 8 at the rear end, and a base 11 having an air circulation hole (not shown).
A cap 11 is slidably fitted to the tip of the shaft 10, and a protrusion 12 protruding inside the cap 11 is attached to the shaft 1.
They are located in a recess 13 formed at 0 and are prevented from coming off from each other. An O-ring 14 is interposed between the fitting portion of the shaft 10 and the base 11 to provide a seal. The pen core 15 is formed by processing a fiber bundle with resin so that ink can flow therethrough, and is inserted into and fixed in the holding tube 16. The holding cylinder 16 has its base side fixed into a hole 10a at the tip of the shaft 10 of the case 7 by means such as press fitting, and the rear end 15a of the pen core 15 is housed in the ink storage body 17 inside the shaft 10.
is inserted into. Therefore, the writing tip of the pen core 15 can move into and out of the writing position and the storage position with respect to the base 11 by sliding the shaft 10 and the base 11 relative to each other. A compression spring 18 is interposed between the base 11 and the shaft 10, and the elasticity of the compression spring 18 urges the pen core 15 toward the storage side.

A sliding piece 2 is provided inside the outer case 1 as a means for moving the writing unit 6 forward and backward as well as rotating it.
0, a cam cylinder 28, a guide 35, etc. are provided. As is clear from FIGS. 1 and 6, the sliding top 20 has a connecting rod 22 connected to the forward movement of the top main body 21, and the front end of the connecting rod 22 has a connecting rod 22 as shown in FIGS. 1 and 8.
As is clear from the figure, an annular projection 23 is provided, and a semicircular fitting piece 24 is connected to the front end of the connecting rod 22. A part of the side surface of the main body 21 is formed in an arc shape, and a protrusion 25 that follows a cam surface 32 of a cam cylinder 28, which will be described later, is provided in the center of the part of the side surface. This sliding piece 20 is shown in FIGS. 1 and 8.
As shown in the figure, it is connected to the writing unit 6 by a connecting portion 29 so as to be bendable and rotatable together. That is, the projection 23 of the connecting rod 22 of the sliding piece 20 is press-fitted into the tail plug 8 of the writing unit 6 over the annular projection 26, and the fitting piece 24 at the front end is formed at the bottom of the tail plug 8. It is fit into the groove 27 so that it can be bent.

The cam cylinder 28 is located inside the rear part of the outer case 1.
Thereafter, it is inserted across the shaft 5 and the front shaft 3, and a key 31 provided inside the front shaft 3 of the outer case 1 is engaged with a key groove 30 formed on the front side of the cam cylinder 28. Therefore, the front shaft 3 and the rear shaft 5 of the outer case 1 are separably connected via the cam cylinder 28, and the cam cylinder 28 is supported in a fixed relationship with the front shaft 3.
It is rotatably supported on the rear shaft 5. Inside the middle part of the cam cylinder 28, as shown in FIGS. 1 and 7, a sliding piece 20 moves forward in a diagonal direction on the circumference.
A retraction cam surface 32 is provided, a notch 33 is formed at the top of the cam surface 32, and a notch 34 is formed at the end of the cam surface 32.

The guide 35 is inserted inside the cam cylinder 28. As shown in FIGS. 1 and 3, the guide 35 has a guide groove 36 formed in the axial direction, and a spring receiver 37 that slightly projects into the guide groove 36 is provided at the tip. A screw 41 is screwed into the rear side of the guide 35 through a hole 40 in the center of an end plate 38 provided at the rear end of the rear shaft 5 in the outer case 1.
Therefore, the guide 35 is fixed to the rear shaft 5 and supported by the cam cylinder 28 so as to be rotatable together with the rear shaft 5. The piece main body 21 of the sliding piece 20 is slidably inserted into the guide groove 36 of the guide 35, and the driven protrusion 25 of the piece main body 21 projects outward from the guide groove 36. A compression spring 42 fitted to the connecting rod 22 of the sliding piece 20 is interposed between the spring receiver 37 of the guide 35 and the piece main body 21 of the sliding piece 20, and the elasticity of the compression spring 42 causes the sliding piece to move. 20 is biased toward the cam surface 32 side of the cam cylinder 28.

As shown in FIG. 4, a fan-shaped positioning projection 43 is provided on the inside of the cam cylinder 28, and a fan-shaped positioning projection 44 is also provided on the outside of the guide 35. Both end surfaces 44a and 44b can rotate at an angle that selectively engages both end surfaces 43a and 43b of the positioning projection 43 of the cam cylinder 28. This rotation angle is set to approximately 180 degrees so that the driven protrusion 25 of the sliding piece 20 can be guided by the cam surface 32 of the cam cylinder 28 and selectively engaged with the notches 33 and 34. . A leaf spring 50 is installed inside the tip of the cam cylinder 28.
An annular portion 51 connected to the base of the writing unit 6 is fixed by press-fitting, and a leaf spring 50 is interposed between the inner surface of the tip shaft 3 and the shaft 10 of the writing unit 6, and the elasticity of the leaf spring 50 causes the writing unit to 6 can be biased so as to bend around the connecting portion 29 with the sliding piece 20 in the storage position.

A seal wall 45 is integrally provided inside the tip of the front shaft 3 of the outer case 1. As is clear from FIGS. 1, 5, 9, and 10, this sealing wall 45 is continuous with an axial guide surface 46, the rear end of this guide surface 46, and crosses the guide surface 46. Seal surface 47 and protrusions 4 on both sides of this seal surface 47
It consists of 8. The guide surface 46 is formed in an arc shape in cross section so as to guide the movement of the base 11 of the writing unit 6 in the axial direction, and the seal surface 47 is connected to the sliding piece 20 by the elasticity of the leaf spring 50 in the storage position as described above. The tip of the mouthpiece 11 of the writing unit 6 which is bent around the connecting portion 29 of the writing unit 6 is formed so as to come into contact with it, and the protrusions 48 on both sides of the sealing surface 47 allow the sealed writing unit 6 to detach in the circumferential direction of the outer case 1. It is set up so that it does not.

Next, the operation of the above embodiment will be explained. 1st
4, the driven projection 25 of the sliding piece 20 is now engaged with the notch 33 of the cam cylinder 28, and the end surface 44 of the positioning projection 44 of the guide 35
a is the end surface 43 of the positioning projection 43 of the cam cylinder 28
a, the tip of the cap 11 of the writing unit 6 comes into contact with the inside of the tip of the tip shaft 3, and the writing unit 6
It is assumed that the writing tip of is advanced to the writing position through the opening 2 of the tip shaft 3. When the rear shaft 5 and guide 35 are rotated clockwise in FIG. 4 from this state,
The sliding piece 20 and the writing unit 6 rotate together,
The driven protrusion 25 of the sliding piece 20 separates from the notch 33, and due to the elasticity of the compression spring 42, the driven protrusion 25
is guided by the cam surface 32, and the sliding piece 20 and writing unit 6 retreat. As the writing unit 6 moves backward, the cap 11 separates from the inner surface of the tip of the tip shaft 3. Due to the elasticity of the compression spring 18, the cap 11 moves forward with respect to the shaft 10, and the writing tip of the pen core 15 moves inside the cap 11. It will be stored. Rear shaft 5 and guide 35
rotates approximately 180 degrees, and when the end surface 44b of the positioning projection 44 of the guide 35 comes into contact with the end surface 43b of the positioning projection 43 of the cam cylinder 28, the driven projection 25 of the sliding piece 20 engages with the notch 34. At the same time, the writing unit 6 bends around the connecting portion 29 with the sliding piece 20 due to the elasticity of the leaf spring 50, and the tip of the cap 11 comes off the guide surface 46 and touches the sealing surface 4.
7. Therefore, the writing unit 6 can be housed in the outer case 1 and the pen core 15 can be sealed. On the contrary, the rear shaft 5 and guide 3
5 rotates, the sliding piece 20 and writing unit 6 rotate together, and the driven protrusion 2 of the sliding piece 20 rotates.
5 is removed from the notch 34, and the writing unit 6 is removed.
The tip of the cap 11 climbs over the protrusion 48 and separates from the sealing surface 47. After detachment, the driven protrusion 25 is guided by the cam surface 32, and the sliding piece 20 and writing unit 6 move forward while rotating against the elasticity of the compression spring 42. As the writing unit 6 moves forward, its cap 11 is guided by the inner surface of the tapered end of the tip shaft 3, and returns to a straight line centering on the connecting portion 29 with the sliding piece 20, so that the tip of the cap 11 is aligned with the tip shaft. When they come into contact with the inner surface of the tip of the shaft 3, the shaft 10, the holding cylinder 16, and the pen core 15 move forward against the elasticity of the compression spring 18, and the writing tip thereof protrudes from the opening 2 of the tip shaft 3. Therefore, it is possible to perform writing tasks.

Note that it is desirable that the sealing wall 45 be made of an elastic material such as rubber.

As is clear from the above, according to the present invention, a writing unit equipped with a pen core that guides ink in an ink storage body to a writing tip can be advanced to a writing position or retreated to a storage position, and moreover, When storing the unit, the pen core can be stored in the cap of the writing unit, and the tip of the cap can be brought into contact with the sealing surface of the outer case. Therefore, there are advantages such as being able to prevent ink from drying up without requiring troublesome operations such as the conventional cap insertion/removal operations.

[Brief explanation of the drawing]

1 to 10 show an embodiment of the felt-tip pen of the present invention, FIG. 1 is a longitudinal sectional view of the writing unit advanced to the writing position, FIG. 2 is a right side view of FIG. 1, Figure 3 is a sectional view taken along the - arrow in Figure 1;
Figure 4 is a cross-sectional view of Figure 1 in the direction of the arrow, Figure 5 is a cross-sectional view of Figure 1 in the direction of the arrow, Figure 6 is a perspective view of the main part of the sliding piece, and Figure 7 is a cam surface of the cam cylinder. Developed floor plan,
Fig. 8 is a sectional view taken along the - arrow in Fig. 1, Fig. 9 is a longitudinal sectional view of the main part in a state where the writing unit is stored, and
Figure 0 is a partially enlarged sectional view showing the sealed state of the writing unit. 1... Outer case, 3... Front shaft, 5... Rear shaft, 6
... Writing unit, 15 ... Pen core, 20 ... Sliding piece, 25 ... Follower projection, 28 ... Cam tube,
32...Cam surface, 35...Guide, 46...Guide surface, 47...Seal surface.

Claims (1)

[Claims] 1. An outer case, a shaft, an ink storage body housed in the shaft, a pen core attached to the tip of the shaft and whose base is inserted into the ink storage body, and a pen core that can be protruded or stored. A cap is slidably fitted to the tip of the shaft so that the pen core is stored, and a spring is provided to bias the cap so that the pen core is stored. a writing unit arranged so that the writing unit can be moved, a guide surface provided inside the tip of the outer case to guide the movement of the tip of the writing unit, and a tip of the mouthpiece of the writing unit that follows the rear end of the guide surface. a sealing surface, a sliding piece connected to the rear end of the writing unit so as to be bendable and rotatable together; and a sliding piece provided in the outer case so that the sliding piece can only slide. a supporting guide provided in the outer case and advancing the sliding piece by rotation;
a cam that moves the writing unit backward and moves the writing unit back and forth between the writing position and the storage position; a spring that urges the writing unit and the sliding piece toward the cam; A felt-tip pen characterized by being equipped with a spring that comes into contact with the sealing surface of the case.