JPS6350147Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement of a sharp pencil in which the chuck spring is made extremely weak and the lead is drawn out by exerting the inertial force of a heavy body.

[Conventional technology]

Conventionally, sharp pencils dispense a fixed amount of lead at a time by simply shaking the cursive hand without having to change hands, and the body and sheath of the pencil are constructed from an integrated shaft.A shaft spring is used between the shaft and the eraser support. The eraser support was secured by screwing or screwing the crown onto the shaft.

[Problem that the invention attempts to solve]

Therefore, when the crown is screwed together, each time the knob is pressed or the weight comes into contact with the eraser support, an impact is applied to the crown, and there is a risk that the crown will loosen or come off. In the unlikely event that the crown comes off, the knob and eraser support may fly out due to the elastic force of the shaft spring, causing serious injury if they hit the user's face, especially the eyes. was. On the other hand, when the crown is screwed on, the mechanical part cannot be removed, resulting in the disadvantage that the mechanical part cannot be replaced or repaired as necessary.
Moreover, all of these require the head crown to be rotated and attached, which poses a serious problem in automating assembly.

[Means for solving problems]

This idea is to provide a protrusion on the elastic piece of a locking device that has elasticity in the radial direction, to fit the protrusion into the through-hole of the shaft and attach it removably, and to lock the eraser support with the locking device. This allows the mechanical part to be easily locked to and removed from the inner stage of the shaft, and all of the above-described drawbacks of the conventional art have been solved.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on the drawings.

At the front of the shaft 1, a base 4 having a built-in lead holder 3 for lightly holding the lead 2 is screwed into the threaded part 5A of the connector 5 via the tip protrusion 1A of the shaft 1.
A tightening ring 6 is loosely fitted into the concave groove 5B of the connector 5. A chuck spring 8 having a very weak elastic force with a load of 200 g or less when installed is provided between the connector 5 and the core tank 7, and furthermore, the rear part of the chuck 9 and the front part of the core tank 7 are fixed. As a result, the head 9A of the chuck 9 is normally pressed against the tightening ring 6. Furthermore, core tank 7
By tensioning the shaft spring 10 between the eraser support 11 located at the rear of the shaft 1 and the inner stage 1B of the shaft 1, the eraser support 11 is urged rearward with a force that does not succumb to the pressure of the eraser 12 when in use. has been done.
In order to prevent the eraser support 11 from jumping out backwards, the eraser support 11 is abutted and locked to a locking tool 13 detachably attached to the shaft 1. To explain the locking tool 13 in more detail with reference to FIG.
3A to constitute an elastic piece having elasticity in the radial direction, and a protrusion 13B is formed on the outer surface of the elastic piece. Incidentally, even if the U-shaped groove is configured in a semicircular shape, this is simply a design change and does not impair the effects of the present invention in any way. Further, the number of elastic pieces having the protrusion 13B is not limited to one, and it is of course possible to provide a plurality of elastic pieces. The protrusion 13B of the locking tool 13 is fitted into the through window 1C formed on the rear side surface of the shaft 1 and is removably attached, so that the above-mentioned mechanism is locked and fixed within the shaft 1. However, the rear part of the lead tank 7 is inserted into the front part 11B of the eraser support 11, and the rear end 7A of the lead tank 7 and the inner stage 11A of the eraser support 11 are configured to be slightly spaced apart. Further, the elastic body 14 attached to the protrusion 7B of the lead tank 7 and the front end 11 of the eraser support 11
A weight body 15 is loosely fitted between C and C. An eraser 12 fitted with an eraser case 16 is fitted to the rear inner side 11D of the eraser support 11, and the knob 17 is attached to the rear outer side 11D so as to cover the eraser 12.
E and protrudes from the rear end 1D of the shaft 1.

When assembling the sharp pencil of this invention as described above, a chuck 9 having an axially movable lead tank 7 and a chuck spring 8 are assembled.
A mechanical section including a weight body 15 slidably attached to the core tank 7 is inserted into the shaft 1, and then the shaft spring 10 is inserted. Furthermore, by inserting the eraser support 11 and the locking tool 13 against the elastic force of the shaft spring 10, the protrusion 13B provided on the elastic piece of the locking tool 13 is inserted into the through-hole of the shaft 1.
C, and the mechanism section is locked and fixed within the shaft 1.
And the threaded part 5 of the connector 5 protruding from the tip of the shaft 1
Assembly is completed by screwing the cap 4 onto A. In order to feed out the lead 2 in this state, the weight body 15 moves forward by swinging the shaft 1 forward in the axial direction, and the inertial force of the weight body 15 moves the lead tank 7 and chuck 9 forward to feed out the lead 2. . In addition, when drawing out the spare lead 18 or returning the protruding lead 2, by pressing the knob 17, the eraser support 11 comes into contact with the rear end 7A of the lead tank 7, and the chuck 9 is expanded. It can be returned by letting out the core 2 or pressing the protruding core 2 against the surface of the paper or against the hand. Next, when it becomes necessary to remove the mechanism, insert the protrusion 13B of the locking tool 13 into the shaft 1.
By pushing down in the radial direction from the through window 1C of the locking tool 13, the protrusion 13B of the locking tool 13 is pushed down from the through window 1C of the shaft 1.
The eraser support 11 is removed from the rear end 1D of the shaft 1. Next, by removing the cap 4 screwed onto the connector 5, the mechanism section is taken out of the shaft 1.

[Effect of idea]

As explained above, the present invention forms an elastic piece by providing a U-shaped groove on the side of the locking tool, and fitting the protrusion provided on the outer surface of the elastic piece into the through-hole of the shaft for attachment and detachment. The feature is that it can be installed easily.

As a result, by an extremely simple operation of pushing down the protrusion of the locking tool from the outside of the through-hole of the shaft, the projection of the locking tool is disengaged from the through-hole of the shaft, and the eraser support is taken out from the rear end of the shaft. Furthermore, by removing the cap screwed onto the connector, the mechanism consisting of the chuck, core tank, etc. can be taken out off-axis, and the locking device that absorbs the inertial force of the heavy body will not loosen or come off. This provides various advantages in that it can be assembled by simply inserting the locking tool and fitting the protrusion of the locking tool into the through-hole of the shaft.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the sharpening pencil of this invention, and FIG. 2 is a perspective view showing the locking device of this invention. 1... shaft, 1A... tip protrusion of shaft 1, 1B...
Inner stage of shaft 1, 1C... through window of shaft 1, 1D... rear end of shaft 1, 2... core, 3... core holder, 4...
Base, 5... Connecting tool, 5A... Threaded part of the connecting tool 5, 5B... Concave groove of the connecting tool 5, 6... Tightening ring,
7... Core tank, 8... Chuck spring, 9
...Chuck, 9A...Chick 9's head, 10
... Axis spring, 11 ... Eraser support, 11
A...Inner stage of eraser support 11, 11B...Front part of eraser support 11, 11C...Eraser support 1
Front end of 1, 11D... Rear inner side of eraser support 11, 11E... Rear outer side of eraser support 11, 1
2... Eraser, 13... Locking tool, 13A... Groove of locking tool 13, 13B... Protrusion of locking tool 13, 1
4...Elastic body, 15... Weight body, 16... Eraser case, 17... Knob, 18... Spare lead.

Claims (1)

[Scope of utility model registration request] A shaft in which the body and sheath are integrated, a core tank housed within the shaft and movable in the axial direction, a chuck fixed to the front part of the core tank, and a chuck that propels the chuck backward with a weak force. A sharp pencil that is equipped with a Tsuku spring and a weight body that is slidably attached in the axial direction between the lead tank and the eraser support, and that gradually draws out the lead by using the inertia of the weight body by swinging the shaft. A through window is provided on the side surface of the shaft, and a U-shaped groove is provided on the side surface of the locking tool to form an elastic piece having elasticity in the radial direction, and the protrusion provided on the outer surface of the elastic piece is inserted into the shaft. A sharp pencil that is removably attached by fitting into the through-hole of the pen, and has an eraser support abutted against a locking tool by a shaft spring stretched between the inner stage of the shaft and the eraser support.