JPS6136391Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a notch-type sharp pencil whose centering amount can be adjusted to the length desired by the user.

With conventional notch-type sharp pencils, the amount of centering that is dispensed with one notch is fixed and cannot be adjusted, so some people prefer a longer or shorter centering amount,
This was very inconvenient when it was desired to change the centering amount depending on the purpose of writing. For example, in a report that requires copying, it is written strongly with a dark core, so the core is likely to break, so the center length should be short, and this is even more true in the case of colored cores. On the other hand, if you frequently take notes during lectures, etc., it will be inconvenient unless the centering distance is made longer. On the other hand, there was the problem that when one lead was used up, no matter how many times I knocked, the spare lead would not come out, which was frustrating. Therefore, Japanese Utility Model Publication No. 54-36738 and Japanese Utility Model Application Publication No. 55-33707 have improved on these problems, but in Publication Utility Model No. 54-36738, the cap must be removed for centering adjustment. It is very troublesome to draw out the screws, and the actual
In both Publication No. 36738 and Japanese Utility Model Application Publication No. 55-33707, since the centering amount was performed by a screw groove, it was not possible to provide a recess, and it was impossible to change the cam surface of the rotating body. Ta. Therefore, even if you are trying to set the centering amount to the position of the most frequently used centering amount, or if you are trying to increase or decrease the current centering amount by a certain amount, you can adjust the rotation while checking the scale that displays the centering amount each time. This made it very difficult to use.

This idea is achieved by providing a concave part in the axial rearward direction on the cam surface of the rotating body, so that when the rotating body is rotated and the protrusion of the sliding body falls into the concave part of the cam surface, the change in resistance causes the sliding body to It is possible to confirm that the protrusion is located in the concave portion of the cam surface of the rotating body without looking at the scale. Therefore, if the protrusion of the sliding body falls into the recess of the cam surface of the rotating body when the sliding body is aligned to the most frequently used centering amount, the centering amount can be changed depending on the purpose of use. Afterwards, when the rotating body is turned to return to normal use, the protrusion of the sliding body falls into the recess of the rotating body, allowing confirmation that the normal centering amount has been adjusted without looking at the scale. It is. Furthermore, if recesses are formed at regular intervals on the cam surface of the rotary body, there are various advantages such as being able to check the amount of change in centering amount from the current position each time the robot passes over the recesses without looking at the scale. The object of the present invention is to provide a knock-type mechanical pencil.

The structure of this invention will be explained based on the drawings. In FIG. 1, after the rotating body 2 is fitted to the rear part of the trunk 1,
Attach the sheath 3 by engaging the key 3A of the sheath 3,
Thereafter, the stopper 4 is screwed onto the shell 1 and tightened until the sheath 3 comes into contact with the receiving stage 1B of the shell 1. Furthermore, torso 1
A sleeve 5 is attached to the rear part of the body 1 to prevent it from becoming clogged. In this way, the sheath 3 is assembled so as to be unrotatable with respect to the barrel 1, and the rotating body 2 is rotatably assembled to constitute the shaft of the knock-type mechanical pencil. At this time, in order to prevent a gap from being formed between the rotary body 2 and the body 1 or the sheath 3, or conversely, the sheath 3 is too tight and the rotary body 2 cannot rotate, the receiving stage 1B of the body 1 is
must be at a position that closely coincides with the rear end 2A of the rotating body 2. By extending the stopper 4 rearward to cover the lead tank 6, it is possible to prevent the lead tank 6 from wobbling when the eraser is used. A cap 8 containing a lead holder 7 is screwed onto the body 1. The sliding body 9, which is pushed backward by the return spring 10 provided between the inner stage IC of the body 1 and the outer stage 9A of the sliding body 9, has its protrusion 9B in the keyway 1A of the body 1. It penetrates and abuts against a cam surface 2B formed on the inner front surface of the rotating body 2. The cam surface 2B is located outside the keyway 1A of the barrel 1, and
As shown in the cam development diagram in the figure, the circumference is less than 360°,
It is also an inclined surface with different depths in the axial direction.
The cam surface 2B has a plurality of small recesses 2C recessed rearward in the axial direction at regular intervals, and further has vertical surfaces on both sides of the cam surface 2B. The chuck 11 is fixed to the core tank 6, and is resiliently pushed backward by a chuck spring 12 provided between the core tank 6 and the sliding body 9, which has a weaker resiliency than the return spring 10, and the outer periphery of the head 11A. The core 14 is held by being closed inward by being brought into contact with a tightening ring 13 fitted therein.
The tightening ring 13 is loosely fitted between the sliding body 9 and the locking stage 1D of the barrel 1 with a movable distance L. As shown in FIG.
There is no problem even if it is loosely fitted between the locking step 108A.

Next, to explain the operation of this device, as shown in FIG. 1, when the lead tank 6 is knocked, the chuck spring 12, which has a weak elasticity, is compressed, and the chuck 11 moves forward together with the tightening ring 13 while holding the lead 14. , the lead 14 is drawn out by the movable distance L of the tightening ring 13, which is the same as in a general knock-type mechanical pencil. To adjust the centering amount, hold the sheath 3 and rotate the rotating body 2. Since the protrusion 9B of the sliding body 9 is guided by the keyway 1A of the body 1, it cannot rotate. 9B comes off from the recess 2C of the cam surface 2B of the rotating body 2 and slides on the cam surface 2B in the axial direction. and sliding body 9
The projection 9B falls into the adjacent recess 2C from the recess 2C where it was located before rotation, and the centering amount is changed by a certain amount. Therefore, if the protrusion 9B of the sliding body 9 is rotated so as to climb up the slope of the cam surface 2B of the rotating body 2, the sliding body 9 will move forward in the axial direction, the centering amount will be shortened, and conversely, the rotation If the body 2 is rotated so as to move down the inclined surface of the cam surface 2B, the sliding body 9 will retreat in the axial direction and the centering amount will become longer. Moreover, at this time, it can be confirmed that the protrusion 9B of the sliding body 9 has fallen into the recess 2C of the rotating body 2 due to a change in the resistance applied to the hand rotating the rotating body 2, and an advantage is obtained that the centering amount can be adjusted at regular intervals.

FIG. 4 shows the cam surface 102 of the rotating body 102.
This shows another embodiment of B, in which when the sliding body is positioned at the centering amount that is considered to be used most frequently, the protrusion of the sliding body is aligned with the cam surface 102 of the rotating body 102.
A small recess 102C is provided at a position where it comes into contact with B. For example, there is a recess 102 at a position of 0.5 mm, which is the centering amount of a normal notch type mechanical pencil.
If you set C, when you change the centering amount due to special use and then try to return the centering amount to 0.5 mm for normal use, you can rotate the rotating body to remove the protrusion on the sliding body. Since it is sufficient to drop it into the concave portion of the cam surface of the rotating body, it is possible to very easily and reliably return the centering amount to the normal usage state.

FIG. 5 shows another embodiment of the receiving stage 201B of the barrel 201, in which the rear half of the keyway 201A is widened to provide a receiving stage 201B, on which the key of the sheath abuts. By doing this, the outer diameter of the shaft can be reduced.

FIG. 6 shows another embodiment of the stopper 104 of the body 301, in which a saw-toothed collar 301E is provided at the rear part of the body 301, and after the rotating body 202 is fitted to the rear part of the body 301. , the key 103A of the sheath 103 is engaged with the keyway 301A of the body 301, and attached;
Further push in the stopper 104 to remove the collar 301 of the body 301.
The inner stage 104A of the stopper 104 passes over E to assemble. Sleeve 105 is then installed to prevent barrel 301 from constricting. Although this makes the field impossible, it can increase assembly efficiency.

FIG. 7 shows another embodiment of this invention, in which a saw-toothed flange 401E is provided at the rear part of the body 401, and after the rotating body 302 is fitted to the rear part of the body 401, the front part of the sheath 203 is The inner stage 203B passes over the collar 401E of the shell 401, and the key 203A of the sheath 203 is engaged with the keyway 401A of the shell 401 to assemble. If necessary, attaching a sleeve can prevent the barrel 401 from becoming clogged.
More certain.

As explained above, this invention is characterized in that the cam surface of the rotary body against which the protrusion of the sliding body comes into contact is provided with a recess that is recessed toward the rear in the axial direction.

This allows you to confirm that the protrusion of the sliding body is located in the concave part of the cam surface of the rotary body without looking at the scale due to the change in resistance applied to the rotating body when the protrusion of the sliding body falls into the concave part of the cam surface of the rotary body. In the centering amount adjustment operation, the protrusion of the sliding body can be instantly positioned in the recess of the cam surface of the rotating body, and the centering amount adjustment operation can be performed very easily.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the main parts of the Knock-type mechanical pencil of this invention, Fig. 2 is a developed view showing the cam surface of the rotating body of Fig. 1, and Fig. 3 is the other parts of the Knock-type mechanical pencil of the invention. FIG. 4 is a developed view showing another embodiment of the cam surface of the rotating body, FIG. 5 is a plan view showing another embodiment of the receiving stage of the cylinder, and FIG. 7 and 7 are longitudinal cross-sectional views of main parts showing other embodiments of the knock-type mechanical pencil of this invention. 1,101,201,301,401... body,
1A, 201A, 301A, 401A...Body 1,
Keyway of 201, 301, 401, 1B, 201
B... Receiving stage of the cylinder 1, 201, 1C... Inner stage of the cylinder 1, 1D... Locking stage of the cylinder 1, 301E, 401E
...Brim 2, 102, 202 of body 301, 401,
302... Rotating body, 2A... Rear end of rotating body 2, 2
B, 102B...Cam surface of rotating body 2, 102, 2
C, 102C... recess of rotating body 2, 102, 3,
103, 203...Sheath, 3A, 103A, 203
A...Key of sheath 3, 103, 203, 203B...
...Front inner stage of sheath 203, 4,104...Stopper, 1
04A... Inner stage of stopper 104, 5, 105... Sleeve, 6... Lead tank, 7... Lead holder,
8,108...Cap, 108A...Locking stage of cap 108, 9,109...Sliding body, 9A...Outer stage of sliding body 9, 9B...Protrusion of sliding body 9, 10...Return spring, 11...chuck, 11A...
...Head of chuck 11, 12...chuck spring, 13, 113...tightening ring, 14...core.

Claims (1)

[Claims for Utility Model Registration] 1. A rotary body rotatably fitted in the rear part of the body, a sheath fixed to the rear part of the body, an inclined cam surface provided on the inner front surface of the rotary body, and the cam A concave portion is formed on the surface of the body in the axial direction, and a keyway extending back and forth in the axial direction is provided in the rear part of the body located inside the cam surface of the rotating body. The elastic force of the return spring that penetrates the protrusion and is provided between the inner stage of the body and the outer stage of the sliding body causes the protrusion of the sliding body to come into contact with the cam surface of the rotary body, and between the sliding body and the core tank. The elastic force of the provided chuck spring is configured to be weaker than the elastic force of the return spring, and a tightening ring is fitted around the outer periphery of the head of the chuck fixed to the front part of the core tank, and the tightening ring is attached to the sliding body. It is loosely fitted between the locking stage of the barrel, and by rotating the rotating body, the protrusion of the sliding body advances and retreats in the axial direction along the cam surface of the rotating body, changing the amount of axial movement of the tightening ring. A notsuku style sharp pencil that is characterized by the ability to 2. The knock-type sharp pencil according to claim 1, wherein the cam surface of the rotating body is provided with a plurality of small axially rearwardly spaced concave portions at regular intervals. 3. The lock-type sharp pencil according to claim 1 of the registered utility model, characterized in that a small recess is provided at an appropriate position on the cam surface of the rotating body.