JPH0139591Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a sharp pencil that uses the inertia of a heavy body to move the chuck forward and pay out the lead, and the tightening ring is held between the middle piece and the connecting device that are locked to the base, so when carrying it, To provide a sharp pencil which prevents the lead from being drawn out and prevents the lead from protruding beyond the tip of the middle piece even if the chuck slides slightly.

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, there is a problem in that the lead is drawn out due to vibrations when carried.

Utility Model Application Publication No. 55-2611 attempts to solve this problem, but in this, the middle piece (called a slider in Utility Model Application Publication No. 55-2611) engages the chuck when carried. is configured to stop. Therefore, due to variations in the core diameter, the inner and outer diameters of the chuck, or the inner diameter of the fastening ring (referred to as a fastener in Japanese Utility Model Application Publication No. 55-2611), the position of the chuck may vary from front to back, and the gap between the middle piece and the chuck may vary. There were drawbacks such as gaps appearing in the top and the middle piece not being completely retracted and making it impossible to lock the chuck. In other words, if there is a gap between the middle piece and the chuck, the chuck will slide due to the vibrations when carrying the bag, and the core will protrude by the distance between the gaps, staining clothes pockets, etc., and damaging the core. If the core is not stored in the bag, the slight inertia force when carrying it will cause the middle piece to slide and the lead will be drawn out. It was not possible to resolve the issue.

This invention is designed to prevent the lead from being drawn out even if the chuck slides by retracting the middle piece and locking the tightening ring when carrying the bag.

The structure of this invention will be explained based on the drawings. In FIG.
The outer flange 4A of the tightening ring 4 comes into contact with the front end 5A of the connecting tool 5 by fitting the tightening ring 4 externally onto the head 3A and providing a chuck spring 6 between the connecting tool 5 and the core tank 2. has been done. The connector 5 has a locking stage 7 at an arbitrary position in the internal hole 7A.
A cap 7, which constitutes B, is screwed together. Further, an outer collar 8A is provided in the internal hole 7A of the cap 7, and a resilient middle piece 8 which is divided into several parts of an arbitrary length from the rear end in the axial direction has a lead holder 9 inside and slides. The outer flange 8A of the middle piece 8 is locked to the rear end of the locking stage 7B of the base 7, and the connecting tool 5 and the middle piece 8 are movably configured.
The tightening ring 4 is held between the two.

Next, to explain the operation of this device, in the carrying state as shown in FIG. Since the outer flange 8A of 8 is securely locked to the locking step 7B of the internal hole 7A of the base 7, the rear end 8B of the middle piece 8 locks the connector 5.
The tightening ring 4, which is pressed against the front end 5A of the chuck 3, cannot move at all, and therefore the chuck 3
As soon as it moves forward, it expands due to its own elasticity and the core holding is released, so the core 10 is not drawn out. Next, when you try to write, the knob 1 protruding from the rear end of the shaft 11
2, the chuck 3 is moved forward, and the front end 3B of the chuck 3 presses the inner stage 8C of the middle piece 8, and the outer flange 8A of the middle piece 8 engages the locking stage 7B of the base 7.
The intermediate piece 8 protrudes from the tip of the cap 7, and the locking of the tightening ring 4 is released, resulting in the state shown in FIG. 2. In order to feed out the lead 10 in this state, the sharp pencil is axially swung, the weight body 1 is slid and collided with the outer flange 2A of the lead tank 2, and the inertial force of the weight body 1 is applied to the chuck spring 6. By overcoming the elastic force, the core tank 2 and chuck 3 are moved forward. Then, the tightening ring 4 fitted onto the head 3A of the chuck 3 also moves forward together with the chuck 3.
Pay out a certain amount of core 10. The chuck 3 is expanded by the tightening ring 4 coming into contact with the rear end of the locking stage 7B of the cap 7, and when the inertia of the weight body 1 disappears, the chuck 3 is retracted by the chuck spring 6 and the chuck 3 is moved back to the second position. Return to the state shown in the figure. The writing is finished,
If you try to carry it again, first click 3.
Advance and expand the tip of the middle piece 8 and the core 10.
By pressing on the paper surface etc., the outer tsuba 8A of the middle piece 8
moves backward over the locking step 7B of the cap 7, and the outer flange 8A of the middle piece 8 is locked to the rear end of the locking step 7B of the cap 7 to clamp the tightening ring 4, and the middle link 8 and the core 10 sinks into the cap 7 and returns to the state shown in FIG.

FIG. 3 shows another embodiment of this invention, in which a middle piece 108 provided with a lead holder 109 is slidably built into the base 107, and a locking piece 108D at the front of the middle piece 108 is attached. It is structured so that it is divided into several parts vertically and has elasticity. When carrying, the front part of the middle piece 108 is locked by the locking stage 107C of the base 107, and the middle piece 108 is retracted. It was pressed and held in place.

FIG. 4 shows another embodiment of this invention, in which a center piece 208 provided with a core holder 209 is slidably built into the base 207, and the ball 13 is inserted into the ball holding hole 208E of the center piece 208. While inserting the ball 13 and the core holder 209,
The ball 13 is configured to bounce outward due to the elastic force of the core holder 209. When carried, the ball 13 is locked to the locking step 207C of the base 207, and the middle piece 208 is retracted.
At the rear end 208B of 8, attach the tightening ring 204 to the coupling tool 20.
It is pressed and held against the front end 205A of 5.

It should be noted that even if the shaft and the connector are collectively referred to as a shaft, this does not detract from the effects of this invention in any way.

As explained above, the present invention is a sharp pencil whose lead is drawn out by swinging the shaft, and by locking the middle piece in the retracted position using the locking stage of the mouthpiece, the tightening ring is held by the middle piece and the connecting tool. The feature is that it is constructed by sandwiching it.

As a result, even if the chuck slides slightly due to the inertia of the heavy body when carrying, the tightening ring will not slide because it is held between the middle piece and the connecting device, and therefore unnecessary core This prevents the locking ring from being extended, and there is little variation in the retracted position of the tightening ring, so the middle piece is securely locked to the locking stage of the mouthpiece, and there is no gap between the middle piece and the tightening ring, so it can be tightened securely. It has the effect of being able to hold the ring.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the sharpening pencil of this invention in a carrying state, Fig. 2 is a partial longitudinal sectional view showing the sharpening pencil of this invention in a writing state, and Figs. 3 and 4 are other drawings of this invention. FIG. 2 is a vertical sectional view of main parts showing an embodiment. 1... Weight body, 2... Core tank, 2A... Outer flange of core tank 2, 3... Chuck, 3A... Head of chuck 3, 3B... Front end of chuck 3, 4,1
04,204...Tightening ring, 4A...Tightening ring 4
outer tsuba, 5,105,205...connector, 5A,
105A, 205A...Connector 5, 105, 20
Front end of 5, 6...chuck spring, 7,10
7,207...cap, 7A...inner hole of cap 7,
7B...Locking step of cap 7, 107C, 207C...
...Lock stage of cap 107, 207, 8, 108, 2
08...Naka piece, 8A...Naka piece 8 outer tsuba, 8B, 1
08B, 208B... Rear end of middle piece 8, 108, 208, 8C... Inner stage of middle piece 8, 108D... Locking piece of middle piece 108, 208E... Ball holding hole of middle piece 208, 9, 109,209...core holder,
10...Core, 11...Shaft, 12...Knob, 13...
…ball.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A mechanical part consisting of a chuck, a tightening ring, a chuck spring, a lead tank, and a weight body is slidably attached to the main body of a sharp pencil, and the damage occurs when the main body of the sharp pencil is shaken. In a sharp pencil whose lead is drawn out by moving the chuck forward using the inertia of a heavy body, a middle piece is slidably built into the mouthpiece provided at the front of the shaft, and a lead holder is provided in the middle piece. The sharpening pencil is also characterized in that when the center piece is locked in the retracted position by the locking stage of the mouthpiece and the middle piece, the tightening ring is held between the middle piece and the connecting device. 2 The outer flange 8A provided at the rear end 8B of the middle piece 8 is divided vertically into several parts to provide elasticity, and the base 7
A locking step 7B is provided in the internal hole 7A of the inner hole 7A, and the outer flange 8A of the middle piece 8 is locked at the rear end of the locking step 7B of the base 7, so that the tightening ring 4 is held between the middle piece 8 and the connecting tool 5. A sharpening pencil according to claim 1 of the patented utility model. 3. The locking piece 108D at the front of the middle piece 108 is divided vertically into several pieces to give it elasticity, and the front part of the middle piece 108 is locked to the locking stage 107C of the base 107, so that the middle piece 10
8. A sharpening pencil according to claim 1, wherein a tightening ring 104 is held between a connecting member 105 and a tightening ring 104. 4 Insert the ball 13 into the ball holding hole 208E of the middle piece 208 and connect the ball 13 and the core holder 20.
9 in contact with each other, the ball 13 is made to bounce outward by the elastic force of the core holder 209, and the ball 13
The sharpening pencil according to claim 1, which has been registered as a utility model, characterized in that the locking ring 204 is held in the locking step 207C of the base 207 and the tightening ring 204 is held between the middle piece 208 and the connecting member 205.