JPS6139597Y2 - - Google Patents

Description

[Detailed description of the invention] This invention allows the tip of the tip and the notch of the rear end to be retracted into the barrel of the writing instrument at the same time when not in use, so that even if it is accidentally dropped, it will not damage the thin tube attached to the tip. It prevents the possibility of the lead coming out due to malfunction, and on the other hand, it allows the tip and the knob to be ejected simultaneously during use, and the simultaneous retraction and simultaneous ejection of the tip and the knob prevents the tip from coming out due to a malfunction. This invention relates to a sharpening pencil that is completed by rotating the barrel.

The present invention will be explained with reference to embodiments shown in the drawings.
It is as follows.

The writing instrument barrel 1 includes a front barrel 1a and a rear barrel 1b which are rotatably provided. A tip 3 having a thin tube 20 is attached to the front of the middle tube 4, which is inside the front barrel 1a and is pressed inward by a spring 2, and a protrusion 5 is provided at the rear. is in contact with the cam surface 7a of the first cylindrical cam 7 fixed to the rear barrel 1b, and also engages with the longitudinal groove 6 formed on the inner wall surface of the front barrel 1a, thereby pivoting the middle tube 4. It can move forward and backward in any direction. A second cylindrical cam 8 is placed inside the first cylindrical cam 7.
The projection 9 provided on the second cylindrical cam 8 engages with the longitudinal groove 10 formed on the first cylindrical cam 7.
can move forward and backward in the axial direction. A protrusion 14 provided on a core tank 13 with a chuck 12 which is inside the middle tube 4 and is pressed inward by a spring 11 comes into contact with the front cam surface 8a of the second cylindrical cam 8, and is pushed toward the rear of the middle tube 4. By engaging with the formed longitudinal groove 15, the core tank 13 can be freely moved back and forth in the axial direction. Furthermore, since the wick tank 13 with the chuck 12 moves in conjunction with the movement of the middle tube 4, the front part of the second cylindrical cam 8 does not have to be a cam surface. A protrusion 19 provided on a knob tube 18 with a knob body 17 which is inside the rear shaft cylinder 1b and is pressed inward by a spring 16 is connected to a second cylindrical cam 8.
The knock tube 1
8 can move forward and backward in the axial direction.

The projections 5, 14, 19 mentioned above are the cam surfaces 7a, 8
a, 8b are respectively locked at the top dead center, for example, a V-shaped groove is provided at the top dead center, and the projections 5, 14, 19 are locked by engaging with the groove. Ru.

As described above, by engaging the protrusion 9 of the second cylindrical cam 8 with the longitudinal groove 10 of the first cylindrical cam 7, the top dead center and bottom dead center of the first cylindrical cam 7 become the top dead center of the second cylindrical cam 8. It is possible to topologically match the point and bottom dead center, respectively.
It's easy to do. In the state shown in FIG. 1, the projection 5 of the middle tube 4 pushed by the spring 2 is locked at the top dead center of the first cylindrical cam 7, and the top dead center of the front cam surface 8a of the second cylindrical cam 8 is locked. The protrusion 14 of the core tank 13 pushed by the spring 11 is engaged, and the rear cam surface 8b of the second cylindrical cam 8
This shows that the protrusion 19 of the lock tube 18 pushed by the spring 16 is locked at the top dead center. Now assume that the front barrel 1a is fixed and the rear barrel 1b is rotated in either direction. The first fixed to the rear shaft cylinder 1b
The cylindrical cam 7 and the second cylindrical cam 8 whose protrusion 9 engages with the longitudinal groove 10 formed in the first cylindrical cam 7 rotate synchronously in the same direction. Since the pipe 4, the core tank 13, and the knot pipe 18 are connected by the engagement relationship between the longitudinal groove 6 and the protrusion 5, and the longitudinal groove 15 and the protrusions 14 and 19, when the front shaft cylinder 1a is fixed, The middle tube 4, core tank 13, and knock tube 18 can move forward and backward in the axial direction, but cannot rotate freely. Therefore, when the first and second cylindrical cams 7, 8 rotate due to the rotation of the rear shaft cylinder 1b, the respective locks at the top dead centers are released.

The middle tube 4, which is no longer locked at the top dead center of the first cylindrical cam 7, is now locked at the bottom dead center of the first cylindrical cam 7 due to the force of the spring 2 (see FIG. 2). in this case,
By appropriately selecting the lift of the first cylindrical cam 7, the rear shaft cylinder 1b can be rotated by approximately 180 degrees (the rotation angle can be set appropriately by the lift of the cam surface), and the thin tube 20 shown in FIG. From the state in which the tip 3 protrudes from the barrel 1, the thin tube 20 is completely retracted into the barrel 1 as shown in Fig. 2, and furthermore, 180
It will be understood that a rotation of .degree. makes it possible to return from the state shown in FIG. 2 to the state shown in FIG.

On the other hand, the force of the springs 11 and 16 is applied to the core tank 13 and the knob pipe 18, which are disengaged from each other at the top dead center of the second cylindrical cam 8, and are engaged at the respective bottom dead center of the second cylindrical cam 8. (See Figure 2).
In this case, due to the lift of the first cylindrical cam 7, the lift by the front cam surface 8a of the second cylindrical cam 8, and the lift by the rear cam surface 8b, the rear shaft cylinder 1b is rotated by approximately 180 degrees, as shown in FIG. It is possible to bring the knob body 17 from the protruding state to the retracted state shown in FIG. 2, and to return it from the state shown in FIG. 2 to the state shown in FIG. 1 by further rotation of 180 degrees. In this way, the tip 3 and the knob body 17 can be simultaneously extended and retracted by rotating the rear shaft cylinder 1b.

Furthermore, in order to feed out the core a fixed length in the state shown in FIG. Leaving them in place, remove the lock tube 18, second cylindrical cam 8, and wick tank 13.
It is possible to advance the core to a fixed length using a well-known chucking operation.

As is clear from the above explanation, the present invention is the first
When the cylindrical cam 7 rotates, the second cylindrical cam 8 also rotates, and by matching the phases of the first cylindrical cam 7 and the second cylindrical cam 8, the tip 3 and the knock body 17 can be extended and retracted simultaneously. Not only can this be completed by rotating the rear shaft cylinder 1b, but also because the second cylindrical cam 8 is provided so as to be able to move forward and backward in the axial direction, the so-called rear end knocking operation can be performed on the protruding knock body 17. Therefore, the forward and backward movements necessary for feeding out the core can be transmitted to the chuck 12 via the second cylindrical cam 8, and centering can be performed using the rear end notch. still,
The present invention is characterized in that the phases of the first cylindrical cam 7 and the second cylindrical cam 8 are matched as described above, and that the second cylindrical cam 8
The important point is that the cam surface can be freely moved forward and backward in the axial direction, and the cam surface formation has been changed in various ways, the cam surface and the protrusion are brought into operational contact, and the number of cams has been changed to correspond to the stroke during rotation. It goes without saying that design changes commonly made by those skilled in the art, such as appropriately setting the number of cam surfaces, can be adopted.

[Brief explanation of the drawing]

1 and 2 are sectional views showing two usage states of the sharpening pencil of the present invention, and FIG. 3 is an enlarged sectional view taken along the line C--C in FIG. 1 and shown in two. 1a...Front shaft cylinder, 1b...Rear shaft cylinder, 3...
Tip metal, 4...middle tube, 7...first cylindrical cam, 8...
...Second cylindrical cam, 12...Chuck, 13...
Core tank, 17...knot body, 18...knot tube.

Claims (1)

[Scope of utility model registration request] A rear shaft cylinder 1b is rotatably provided with respect to the front shaft cylinder 1a, and a middle tube 4 with a tip 3 which is inside the front shaft cylinder 1a and is pressed inward is connected to the rear shaft cylinder 1b side. The core tank 1 is movable in the axial direction by a first cylindrical cam 7 attached to the middle pipe 4, and the core tank 1 is connected to the middle pipe 4.
A second cylindrical cam 8 which can rotate together with the first cylindrical cam 7 in phase with the first cylindrical cam 7 is installed so as to be able to move forward and backward in the axial direction. The knob body 1 is movable in the axial direction by a cylindrical cam 7, and is biased forward within the rear shaft cylinder 1b by rotation of the second cylindrical cam 8.
A sharp pencil in which a knob tube 18 with a 7 is freely movable in the axial direction, and a tip 3 and a knob body 17 can be drawn in and projected simultaneously.