JPS6136389Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is designed so that when the sharp pencil is not in use, the tip at the tip as well as the notch at the rear end can be retracted into the casing so that it can be attached to the tip even if it is accidentally dropped. Not only does it not damage the capillary tube, but it also prevents the lead from coming out due to incorrect operation, so it has been devised to enable simultaneous retraction and simultaneous ejection of the tip and the knock body.

The present invention will be explained with reference to embodiments shown in the drawings.
1 and 2 show the state in which both the tip metal 1 at the front end and the knock body 2 at the rear end are retracted into the casing 3. The tip 1 has a thin tube 4 at its tip, and the tip 1 is attached to the tip of the barrel 5, and inside the barrel 5 there are a core detent rubber ring 6, a chuck 7, a core tank 8, and a spring 9. There is no major difference from the case of a normal sharp pencil in that the knob body 2 is fitted into the knob tube 10.

However, the first cylindrical cam 14 is fixed to the attachment point 13 of the rear casing 12 in the casing 3 in which the front casing 11 and the rear casing 12 are rotatably provided at the attachment point 13. A second cylindrical cam 15 is fixed to the cylindrical cam 15, and both cylindrical cams 14 and 15 function as described below.

First, regarding the first cylindrical cam 14, a guide groove 19 is formed on the inner surface of the front casing 11 and is continuous with a cavity 18 having a step 17 for receiving the spring 16. A protrusion 21 formed with a protrusion 20 that fits into the groove 19 is fixed to the outer surface of the barrel 5, and the spring 16 presses the protrusion 21, so that the barrel 5 is always directed toward the inside of the front casing 11. I feel a force trying to pull me in. Therefore, the protrusion 21 corresponds to the trough 14a of the first cylindrical cam 14.
By coming into contact with this, the retracting position of the lead metal 1 is restricted, and it is prevented from entering any deeper.

Next, regarding the second cylindrical cam 15, similar to the front casing 11, the rear casing 12 has a guide groove 25 continuous to a cavity 24 having a step 23 for receiving a spring 22 on the inner surface. and
The protrusion 26 that fits into the guide groove 25 is fixed to the outer surface of the second cylindrical cam 15, and the spring 22 presses against the spring seat 27 formed on the knob tube 10, so that the knob body 2 is fitted into the knob tube. 10 is constantly subjected to a force that tends to pull it into the rear casing 12. By the way, in the present invention, a vertical groove 28 is provided at the rear of the shaft cylinder 5, and a projection 29 fixed to the outer surface of the core tank 8 is fitted into the vertical groove 28.
comes into contact with the valley portion 15a of the second cylindrical cam 15, thereby restricting the retracted position of the knock body 2, and prevents it from entering any deeper.

In order to achieve simultaneous retraction of the tip 1 and the knock body 2, the first cylindrical cam is The trough 14a of the second cylindrical cam 14 and the trough 15a of the second cylindrical cam 15 need to match topologically. Due to the engagement relationship between the shaft tube 5 and the core tank 8, and due to the engagement relationship between the vertical groove 28 and the protrusion 29, only the shaft tube 5 or the core tank 8 cannot rotate freely, so the protrusion part 20 and vertical groove 28
By arranging them on the same line, both valleys 14
a, 15a can be topologically matched.

In order to achieve simultaneous protrusion of the tip 1 and the knock body 2, both the cylindrical cams 14 and 15 are provided with troughs 14a and 1.
As shown in FIGS. 2-A and 2-B, locking grooves 14b and 15b are formed at distances S and S' from 5a, respectively, and at positions that match topologically.

3 1 and 3 2 show a state in which both the tip metal 1 at the tip and the knock body 2 at the rear end protrude outward from the inside of the casing 3.
To change from the retracted state shown in FIG. 2 to such a protruded state, for example, the front casing 11 is fixed and the rear casing 12 is rotated. In such a case, the first cylindrical cam 1 fixed to the rear casing 12
Of course, the second cylindrical cam 15 also rotates due to the engagement relationship between the guide groove 25 and the protrusion 26. As the first cylindrical cam 14 rotates, its inclined surface 14c pushes the rear surface of the protrusion 21 of the shaft cylinder 5 forward against the spring 16, and the shaft cylinder 5 is thus locked in the locking groove 14b. The core tank 8 also moves forward by a distance S. On the other hand, due to the rotation of the second cylindrical cam 15,
The inclined surface 15c cooperates with the rear end surface of the protrusion 29 of the core tank 8, pushes the knob tube 10 rearward against the spring 22, and comes to be locked in the locking groove 15b. If the protrusion length of the knob body 2 is L, then the stroke length S' of the second cylindrical cam 15 is equal to the stroke length S of the first cylindrical cam 14, which is the protrusion length of the tip 1, plus the protrusion length of the knob body 2. It is equal to the sum of L.

To return the protruding state shown in FIGS. 3 1 and 3 2 to the retracted state shown in FIGS.
By raising the slopes 14d and 15
d, all you have to do is let go of the springs 16 and 22.
It operates so as to lock in the valley portions 14a, 15a with the force of. Further, as shown in FIG. 41 and FIG. 42, when the force of the spring 9 is weaker than the force of the spring 16 by knocking the knock body 2, the shaft cylinder 5 is left in the same position and the knock tube is removed. 10, second cylindrical cam 15,
And since the protrusion 29 of the core tank 8 moves forward,
In the end, the well-known chuck operation allows the lead to be fed out to a fixed length.

As is clear from the above explanation, both the shaft cylinder 5 having the tip 1 and the knob tube 10 fitted with the knob body 2 are pressed into the inside of the casing 3 by the springs 16 and 22, and are pushed in the longitudinal direction. A core tank 8 having a shaft cylinder 5 and a chuck 7 fitted inside the shaft cylinder 5 is slidably inserted into the vertical groove 2.
8- In engagement with the protrusion 29, it must also be slidable in the longitudinal direction, and the protrusion 21 of the shaft cylinder 5 is the first cylindrical cam 14 fixed to the rear casing 12, and the core tank The protrusions 29 of No. 8 are received by the second cylindrical cams 15 fixed to the knob tube 10, and thereby the front casing 1
The relative rotation of the tip 1 and the rear casing 12 allows the tip 1 and the knock body 2 to be pulled in and out simultaneously, and the lead can also be fed out a fixed length.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing one embodiment of a sharpening pencil according to the present invention; FIGS. 2-A and 2-B are developed views of the first cam and the second cam; 3.1 and 3.2 are cross-sectional views showing both the tip and the knock body protruding outward from the inside of the casing. 5 is a sectional view taken along the - line in FIG. 1, and FIG. 6 is a sectional view taken along the - line in FIG. 1. 1... Lead metal, 2... Knot body, 3... Casing, 5... Shaft cylinder, 7... Chack, 8... Core tank, 10... Knot pipe, 11... Front casing, 12... Back Casing, 14...first cylindrical cam, 15...second cylindrical cam, 16, 22...
...Spring, 21...Protrusion, 28...Vertical groove, 29...
...protrusion.

Claims (1)

[Scope of utility model registration request] The front casing 11 and the rear casing 12 are rotatably attached to the inside of the casing 3, and the shaft tube 5 having the tip 1 and the knock pipe 10 into which the knock body 2 is fitted are fitted so as to be slidable in the longitudinal direction. The core is pressed inward by springs 16 and 22, and has a protrusion 21 on its outer surface and a vertical groove 28 behind it, and has a chuck 7 fitted inside the barrel 5. The tank 8 is formed with a protrusion 29 on its outer surface that fits into the longitudinal groove 28, and the protrusion 21 of the shaft cylinder 5 is the trough 14a of the first cylindrical cam 14 fixed to the rear casing 12, and the core tank The protrusions 29 of No. 8 are received at the troughs 15a of the second cylindrical cam 15 fixed to the knob tube 10, respectively, and the first and second cylindrical cams 14, 15
A sharp pencil in which the troughs 14a and 15a of the troughs 14a and 15a are matched topologically, and the stroke length of the second cylindrical cam 15 is the sum of the stroke length of the first cylindrical cam 14 and the protrusion length of the knob body 2.