JPS591839Y2 - Shape pencil - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a knock-type mechanical pencil in which a tip pipe that guides a pencil lead at the tip slides.

Knock-type mechanical pencils generally have a tip pipe at the tip of the barrel to protect and guide the tip of the pencil lead.

Conventionally, there are two types of tip pipes: fixed ones and sliding ones.In the former, you write with the lead protruding from the tip pipe, and if you let the lead protrude too long, it will break under the pressure of the writing, so the length that can protrude is long enough. There are inherent limitations to the dowel pin, and when the core wears out, there is the hassle of having to frequently operate the dowel pin.Also, since the protruding length of the tip pipe cannot be changed, when drawing a line using a ruler, it may be difficult to draw a line depending on the thickness of the ruler. There was a problem that it got stuck and could not be drawn accurately.

In the latter sliding type, the tip pipe slides naturally while writing without the need for the lead to protrude.As a result, the slide slides with almost no resistance, so there is no need to worry about the lead breaking. On the other hand, it is difficult to write because the lead cannot be seen, causing a feeling of anxiety, and it is difficult to stop the tip pipe at the desired position, and when using a ruler, it is difficult to pull it in with a slight force. , as with the former, had the problem of not being able to draw lines accurately.

In view of the above problems, the present invention allows the tip pipe to slide and stop at a desired position, and also makes it possible to protrude the lead by the required length by operating the tip pipe without operating the dowel pin or holding the mechanical pencil again when writing. This is what I did.

The present invention will be explained below with reference to embodiments shown in the drawings.

As shown in FIGS. 1 and 2, the barrel body 1 and the base 12
An inserting member 2 is installed in a shaft tube 1 consisting of a shaft tube 1 and a shaft tube 1.

A clip 13 is provided on the barrel body 11.

The inner insertion member 2 has a core case 21 and a split chuck mechanism 23 connected to the core case 21 via a joint pipe 22. The chuck is activated by tightening.

The core case 21 and the fastener 26 are integrated with the split chuck 24 so that the fastener 26 always tightens the split chuck 24.
A spring 28 is stretched between the spring 28 and the spring 28 via a spring receiving ring 27.

The fastener 26 is guided by the inner cylindrical portion 14 of the cap 12 and is slidable in the axial direction between the rear surface of the sleeve 15 and the front surface of the spring receiver ring 27, and is normally pulled by the chuck head 25 to close the spring receiver ring 27.
It is pressed against the front of the

A knock pin 29 is provided at the rear end of the inserting member 2 .

In this embodiment, the chuck mechanism 23, the spring receiving ring 27, and the spring 28 constitute the core feeding means.
The inner cylindrical part 14 of 2 is integrated with the spring receiving ring 27, or the inside of the fastener 26 is made into two stages, and the small diameter part that carries the pencil lead while it is chucked is configured with the large diameter part that releases the chuck. The lead feeding means may be configured such that the tool 26 itself does not slide.

A stepped portion 16 is formed inside the barrel body 11 near the spring receiving ring 27, and the spring receiving ring 27 is located between the stepped portion 16 and the end portion 17 of the base 12 and is movable therebetween. The spring 1 is inserted between the spring receiving step 18 provided in the middle part of the shaft cylinder body 11.
9 is stretched, and the spring receiving ring 27 is brought into contact with the end portion 17 of the base 12.

This means that the inner member 2 is movable in the axial direction by a predetermined amount via the spring bearing ring 27, and is normally elastically biased and installed in the shaft cylinder so as to be located on the tip side. means.

In other embodiments, it may be attached by a holding means via any part of the inserting member 2 without using the spring receiving ring 27.

A tip pipe 31 protrudes from the inside of the mouthpiece 12 and constitutes a tip guide member 3 together with a slider 32 and a holding chuck 33.

That is, the tip pipe 31 is integrally supported by the slider 32 and slides in the axial direction.
As shown in the figure, the protrusion 34 comes into pressure contact with the inner surface of the cap 12, and slides in the axial direction when a certain force or more is applied.

The pressure contact may be made by a large diameter portion 35 of an elastic material shown in FIG. 4 of the protruding portion 34, or the like.

A holding chuck 33 is attached to the slider 32. The holding chuck 33, which is made of an elastic material, lightly holds the pencil lead inserted inside and prevents the lead from returning when the lead is fed out. 32 is weaker than the sliding force.

To use the mechanical pencil according to the present invention, by knocking the dowel pin 29, the split chuck 24 will be attached to the pencil lead 4.
After moving forward together with the fastener 26 while chucking the sleeve, the fastener 26 comes into contact with the rear surface of the sleeve 15 and the chuck head 2
Only the tip 5 moves forward to open the chuck, and the chuck head 25, which advances the pencil lead 4 by the amount of the advance, further moves forward and comes into contact with and pushes the tip guide member 3, causing the tip pipe 31 to protrude almost to its maximum extent.

If the knock pin 29 is returned and then knocked again, the pencil lead 4 can be further advanced and repeated to protrude from the tip pipe 31 by the required amount.

At this time, the spring receiving ring 27 does not move and the end 1 of the base 12
It remains in contact with 7.

Then, when the pencil lead 4 wears out while writing and becomes almost the same as the tip of the tip pipe 31, when the tip is pressed against the paper surface, the tip guide member 3 retreats together with the pencil lead 4, and the The state shown below the center line in Figure 3 is reached.

When the pencil lead 4 retreats, the split chuck mechanism 23 that chucks it also retreats, and eventually the entire inserting member 2 retreats.

Thereafter, when the tip of the tip pipe 31 is released from the paper surface, the insertion member 2 returns to its original position by the action of the spring 19.

However, in the tip guide member 3, the slider 32 is
Since the force is stronger than the force with which the holding chuck 33 holds the pencil lead 4, the pencil lead 4 moves forward while leaving the tip guide member 3 in the retracted position, and the pencil lead 4 moves forward by the amount of advance. 4 protrudes from the tip pipe 31.

The maximum value of the amount of protrusion of the pencil lead 4 is the distance between the stepped portion 16 and the rear surface of the spring receiving ring 27.

This is because the interior member 2 cannot retreat any further.

Needless to say, if only the tip guide member 3 is used, the amount of protrusion of the tip pipe 31 can be changed independently.

As explained above, according to the present invention, the pencil lead can be protruded by simply pressing the tip pipe lightly, so the trouble of holding the mechanical pencil again and operating the dowel pin when writing is greatly reduced, making it extremely easy to use. It becomes an easy mechanical pencil.

In addition, since the guide member is engaged with the shaft cylinder under pressure, it has many advantages such as being extremely convenient when using a ruler by changing the amount of protrusion of the tip pipe as necessary and stopping it. .

Furthermore, since the spring of the holding means of the insert member is always applied to the cap, it prevents the cap from loosening and can buffer shocks from the tip.

Note that the cap is not limited to metal, and it goes without saying that the present invention can also be applied to an integral shaft cylinder without a cap.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is an overall front view showing the main parts in cross section, Fig. 2 is an enlarged sectional view of the main parts, and Fig. 3 is an enlarged cross section of the main parts to explain the operation. In the figures, different states are shown divided by center lines for ease of understanding, and FIG. 4 is a perspective view of the slider. 1... shaft cylinder, 11... shaft cylinder body, 13
...Base, 2...Insertion member, 23...
...Split chuck mechanism, 27... Spring receiving ring, 3... Tip guide member, 31... Tip pipe, 32... Slider, 33・・・・・・
holding chuck.

Claims (1)

[Scope of utility model registration request] In a knock-type mechanical pencil with a sliding tip pipe, an inserting member consisting of a lead case and a lead feeding means using a split chuck mechanism connected to the lead case is movable in the axial direction by a predetermined amount. and a tip pipe that is inserted into and attached to the barrel by a holding means that is elastically biased and held so that it is always positioned on the tip side, and a pencil lead is inserted and guided through the tip of the barrel. A slider that integrally supports the tip pipe and slidably engages with the shaft tube in the axial direction with a force above a certain level, and a pencil lead attached to the slider and inserted through its center so that the slider slides. The tip guide member includes a holding chuck that holds the split chuck with a force that is weaker than the force applied, and the holding means is connected to a spring receiving ring that is in contact with the rear surface of the fastener of the split chuck, between the end of the base of the barrel and the barrel main body. A spring is placed between the spring bearing ring and the stepped part provided in the cylinder body to regulate the amount of axial movement, and a spring is stretched between the spring bearing ring and the spring bearing provided in the middle part of the shaft cylinder body. The spring bearing ring is brought into contact with the end of the mouthpiece, and the spring bearing is provided between the ring and the inner member for use as a core feeding means for biasing the inner member in a backward direction. A mechanical pencil that is characterized by a tensioned spring.