JPS6136390Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sharpening pencil whose lead is drawn out by the inertia of a heavy body, and which can prevent the lead from drawing out when carried.

Conventional sharpening pencils that use the inertia of a heavy body to draw out the lead are constructed with a chuck spring that has a very weak spring force so that the lead can be drawn out just by shaking the pencil lightly. This eliminates the trouble of having to pull out the lead, but on the other hand, it poses the problem of the lead being drawn out due to vibrations when carried.

This device is designed so that when the pen is carried, the rotating body rotates to clamp the tightening ring, preventing the lead from being advanced even if the chuck slides.

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 body 1, the key 3A of the sheath 3 is inserted into the keyway 1A of the body 1.
to attach the sheath 3, and then attach the stopper 4.
is screwed onto the body 1 and tightened until the sheath 3 contacts the receiving stage 1B of the body 1. A sleeve 5 for preventing the barrel 1 from constricting is attached to the rear part of the barrel 1.
On the other hand, the sheath 3 is assembled in a non-rotatable manner, and the rotating body 2 is assembled in a rotatable manner. Furthermore, the rear inner stage 3B of the scabbard 3
and the front end 6B of the eraser support 6, the elastic piece 6A of the eraser support 6, which is fitted into the through window 3C of the sheath 3, moves through the through window 3C.
It is locked at the rear end 3D of. At this time, the rotating body 2 and the body 1
Alternatively, the receiving stage 1B of the barrel 1 is aligned with the rear end 2A of the rotating body 2 to prevent a gap from forming between the sheath 3 and the rotating body 2 due to the sheath 3 becoming too tight. It is necessary to position the
A cap 9 with a built-in core holder 8 is screwed onto the body 1 and is pushed backward by a return spring 11 provided between the inner stage IC of the body 1 and the outer stage 10A of the sliding body 10. The protrusion 10B of the sliding body 10 passes through the keyway 1A of the barrel 1 and comes into contact with a cam surface 2B formed on the rotating body 2. The cam surface 2B has a circumference of 360 mm as shown in the developed view of the cam in FIG.
It is an inclined surface with different depths in the axial direction, and has vertical surfaces on both sides. Check 12
is fixed to the core tank 13, and the sliding body 10, which has a weaker elasticity than the return spring 11, and the core tank 13
It is urged rearward by a chuck spring 14 provided between the core 16, and is closed inward by contacting a tightening ring 15 fitted on the outside, thereby holding the core 16.
The tightening ring 15 is a locking step 1D between the sliding body 10 and the barrel 1.
It is loosely fitted with a movable distance L between the two. A weight body 17 is loosely fitted on the outside of the lead tank 13, and the weight body 17 is configured to be slidable between the outer flange 13A of the lead tank 13 and the inner flange 6C of the eraser support 6.

In the above-described embodiment, the tightening ring 15 is loosely fitted between the locking step 1D of the barrel 1 and the sliding body 10.
Instead of a locking step on the cylinder, the cylinder 10 as shown in FIG.
A locking step 109A is formed on the cap 109 screwed to the cap 1, and a tightening ring 115 is loosely fitted between the locking step 109A and the sliding body 110, or a locking tool (not shown) is provided on the body. There is no problem even if the locking ring is loosely fitted between the locking tool and the sliding body.

Next, to explain the operation of this invention, when the rotary body 2 is rotated with the sheath 3 fixed in the state shown in FIG.
While being guided by A, it slides on the cam surface 2B and moves in the axial direction. When carrying, the protrusion 10B of the sliding body 10 is positioned at the front of the cam surface 2B of the rotating body 2 in the axial direction, and the outer flange 15A of the ring 15 is tightened by the locking step 1D of the barrel 1 and the front end 10C of the sliding body 10. Hold it in place as shown in Figure 4. In this state, even if the chuck 12 moves due to vibrations during carrying, the tightening ring 15 will not move and the core 16 will not be drawn out at all. Also, when writing, the rotating body 2 is rotated and the sliding body 1
By arbitrarily moving 0 in the axial direction and adjusting the centering amount obtained by moving the tightening ring 15 in the axial direction, a centering amount suitable for the purpose of use can be obtained.

FIG. 5 shows a cam surface 102B on the rotating body 102.
This shows another embodiment in which a large recess 102C is provided in the axial direction at the rearmost part of the reduced surface having different depths in the axial direction. This has the special effect that an extremely long centering amount can be obtained, and that when one core is finished, a spare core can be fed out with just a few knocks.

FIG. 6 shows a cam surface 202B on the rotating body 202.
This shows another embodiment of the cam surface 202B.
A plurality of small recesses 202C recessed rearward in the axial direction are provided at regular intervals. By doing so, there is a special effect that the rotation of the rotating body 202 is controlled and the centering amount can be adjusted in fixed pitch increments.

FIG. 7 shows a cam surface 302B on the rotating body 302.
This shows another embodiment of the cam surface 302B.
A small recess 30 recessed axially rearward at one location.
2C is provided. For example, by setting the concave portion 302C at a position of 0.5 mm, which is the centering amount of a normal notch type mechanical pencil, the frequently used centering amount can be quickly and reliably found.

FIG. 8 shows another embodiment of the invention, in which a rotating body 402 integrated with a sheath 402D is fitted into the rear part of the trunk 201, and then the stopper 104
is screwed onto the shell 201 and tightened until the rotating body 402 comes into contact with the end surface 201E of the shell 201. Further, by attaching a sleeve 105 to the rear part of the barrel 201 to prevent the barrel 201 from constricting, the rotary body 402 is rotatably assembled with respect to the barrel 201.

As explained above, this invention is a sharp pencil that draws out the lead using the inertia of a heavy body, and a rotary body with a cam surface inclined at different depths in the axial direction is rotatably attached to the barrel, and the key of the barrel is rotated. The feature is that the protrusion of the sliding body that penetrates the groove is brought into contact with the cam surface of the rotating body by a return spring that has a stronger elastic force than the chuck spring.

As a result, when carrying, the rotating body is rotated to position the protrusion of the sliding body at the front of the cam surface in the axial direction.
The locking ring is held between the locking stage of the barrel, the locking tool screwed onto the barrel, or the locking stage of the mouthpiece screwed onto the barrel, and the sliding body to prevent unnecessary core feeding. Moreover, the centering amount can be adjusted arbitrarily according to the scribe's preference.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing the sharpening pencil of this invention, Fig. 2 is a developed view showing the cam surface of the rotating body of Fig. 1, and Figs. 3 and 8 show other embodiments of the invention. FIG. 4 is a vertical sectional view of the main part showing the portable state of FIG. 1, and FIGS. 5, 6, and 7 are developed views showing the cam surface of the rotating body of this invention. . 1,101,201...Body, 1A...Keyway of shell 1, 1B...Socket stage of shell 1, 1C...Inner stage of shell 1, 1D...Locking stage of shell 1, 201E...Body 20
End face of 1, 2, 102, 202, 302, 402
... Rotating body, 2A... Rear end of rotating body 2, 2B, 1
02B, 202B, 302B... Rotating body, 2, 1
Cam surface of 02, 202, 302, 102C, 20
2C, 302C... Rotating body, 102, 202, 3
02 recess, 402D... sheath part of the rotating body 402,
3... Scabbard, 3A... Key of scabbard 3, 3B... Rear inner stage of scabbard 3, 3C... Penetration window of scabbard 3, 3D... Scabbard 3
Rear end, 4,104... Stop, 5,105... Sleeve, 6... Eraser support, 6A... Elastic piece of eraser support 6, 6B... Front end of eraser support 6, 6C... Eraser support 6 inner flange, 7... shaft spring, 8... lead holder, 9,109... cap, 109A... locking step of cap 109, 10,1
10...Sliding body, 10A...Outer stage of sliding body 10,
10B...Protrusion of the sliding body 10, 10C...Front end of the sliding body 10, 11...Return spring, 12
...chuck, 13... core tank, 13A... outer flange of core tank 13, 14... chuck spring, 15, 115... tightening ring, 15A... outer flange of tightening ring 15, 16... core.

Claims (1)

[Scope of utility model registration request] 1. In a sharp pencil that has a chuck and a tightening ring that is fitted onto the chuck and opens and closes the chuck, the lead is drawn out by the penetrating force of a heavy body, and the cam is inclined at different depths in the axial direction. A rotating body having a surface is rotatably attached to the body, and a protrusion of the sliding body passing through a keyway of the body is brought into contact with a cam surface of the rotating body by a return spring having a stronger elastic force than a chuck spring. When the rotating body rotates, the protrusion of the sliding body slides on the cam surface of the rotating body and slides back and forth in the axial direction, and the sliding body, the lock stage of the barrel, and the lock screwed onto the barrel A tightening ring is loosely fitted between the tool or the locking stage of the cap screwed onto the barrel, and the protrusion of the sliding body is positioned at the axial front of the cam surface of the rotating body when carried. A sharp pencil characterized in that a locking ring is held between a locking stage, a locking tool screwed onto the barrel, or a locking stage of a mouthpiece screwed onto the barrel, and a sliding body.