JP6532380B2 - mechanical pencil - Google Patents

Description

  The present invention relates to a mechanical pencil which is used in a state in which a writing core accommodated inside a barrel is drawn out from the barrel and made to project from a tip.

With a mechanical pencil that uses the front end of the writing core to project from the tip of the barrel, the longer the front end of the writing core that is projected from the tip of the barrel, or the higher the writing pressure, There is a problem that a load is applied to the front end portion of the writing core protruding from the tip end portion of the tube and it is easily broken.
A mechanical pencil which attempts to solve this problem is described, for example, in Patent Document 1 and Patent Document 2.

In the patent document 1, when an excessive writing pressure to the rear along the axial center of the barrel is applied to the writing core held by the chuck, a buffer spring is provided with the pressing force in the barrel. A mechanical pencil having a structure to buffer and prevent core breakage is described.
In this structure, a buffer spring that stretches and contracts in the direction along the axis effectively functions against the writing pressure when writing with the shaft cylinder of a mechanical pencil standing upright, but in general, the user Since writing is performed by inclining the barrel, the buffer spring may not function effectively to prevent core breakage.

  In the patent document 2, when an excessive writing pressure is applied to the writing core backward along the axial center, the writing core is protected by being immersed in the holder as in the patent document 1, and the shaft cylinder is The holder moves forward of the barrel to protect the writing core when an oblique writing pressure against the axis of the barrel is applied to the writing core held by the chuck by writing with an inclination to the paper surface. Mechanical pencils of the structure are described.

  In the structures of Patent Document 1 and Patent Document 2, when the writing pressure is applied to the writing core, the function of preventing the core breakage works through the writing core, and the writing core is held by the chuck. Since the side surface of the writing core rubs against a member (core guide pipe in Patent Document 1 and holder in Patent Document 2) that contacts the side surface, the function of preventing core breakage many times repeatedly works, The side of the core may be scraped and thinned without the user's knowledge, and as a result, the core may be easily broken.

Japanese Utility Model Publication No. 56-130874 JP, 2015-123689, A

  The present invention has been made in view of the above problems, and writing is performed with an inclination of the axial cylinder with respect to the paper surface and writing is performed on the writing core held by the chuck, with an oblique pen pressure against the axial center of the axial cylinder. An object of the present invention is to obtain a mechanical pencil capable of detecting a state in which a core breakage prevention function is activated and a user can recognize a state in which the core breakage prevention function is activated.

The present invention
"The barrel body constituting the barrel, the tip body fixed to the front of the barrel body, the core feeding unit having the chuck for feeding out the writing core, and the core body disposed inside the tip body A slide body having a tip end portion projecting from the tip end body, an outer collar being provided at a front portion of the chuck, and an inner collar to be engaged with the outer collar at a rear portion of the slide body The cylinder main body has a pressing portion in the front region, and the sliding body has a pressed portion in the rear region, and at least one of the pressing portion and the pressed portion. Is a tapered surface whose diameter gradually decreases toward the axial direction backward, and before the sliding body tilts with respect to the barrel body, the throttling ring of the lead-out unit squeezes the chuck, and When the sliding body tilts with respect to the barrel body, the pressing portion is the pressed portion. It said flange by advancing the tow the outer flange forward, a mechanical pencil. "Which is characterized in that the chuck is released from the choke ring.

  According to the present invention, when an oblique writing pressure with respect to the axial center of the barrel main body is strongly applied to the writing core, the pressing portion of the barrel main body is the sliding surface of the sliding body by the tapered surface of the pressing portion or the pressing portion. By advancing the pressing portion, the inner rod of the sliding member pulls the outer ring of the chuck forward, the chuck is released from the squeezing ring, and the writing core held by the chuck is inserted into the tip of the sliding member. Because the user can recognize the situation where the core breakage prevention function has been activated, and the user performs an operation for drawing out the writing core when writing again, the core breakage prevention function is automatically repeated many times Also, it was possible to obtain a mechanical pencil that was not activated and the sides of the writing core were chipped without knowing it.

It is a partial cross section figure of the mechanical pencil of a present Example. It is principal part sectional drawing in use condition. It is principal part sectional drawing in the state in which the core breakage prevention function operated.

Hereinafter, the mechanical pencil of the present embodiment will be described with reference to the drawings.
In this embodiment, the direction in which the writing core protrudes is expressed as the front, and the opposite side is expressed as the rear.
In order to make the description easy to understand, similar members in the drawings and similar portions are denoted by the same reference numerals.

Hereinafter, the mechanical pencil of the present embodiment will be described based on FIGS. 1 to 3.
The barrel 2 of the mechanical pencil 1 has a barrel body 3 and a tip 4 screwed to the front of the barrel body 3.
A core feeding unit 7 having a chuck 6 for feeding the writing core 5 is accommodated in the inside of the barrel body 3, and a sliding member 8 in contact with the barrel body 3 is disposed in front of the core feeding unit 7. It is set up.
At the front part of the barrel body 3 is formed a pressing part 3a consisting of a tapered surface whose diameter decreases gradually toward the axial rear, and at the rear end of the sliding body 8, the diameter gradually decreases toward the rear in the axial direction. A pressed portion 8a having a tapered surface is formed, and the pressing portion 3a and the pressed portion 8a are in contact with each other.
The sliding body 8 has a pipe-like tip 8 b protruding from the opening 4 a of the front end body 4 and holds the writing core 5 by the core holder 9 fitted inside. Further, an inner ring 8 c is formed at the rear portion of the sliding body 8 and is locked to an outer ring 6 a formed at the front portion of the chuck 6.

  The lead-out unit 7 operates via the lead tank 11 connected to the knock body 10 by pushing the knocking body 10 which is made to project from the rear end of the barrel body 3. The core tank 11 is connected to the chuck 6 for holding the writing core 5 via the tubular connector 12 in which the rear portion 12 a is inserted and attached to the opening 11 a of the core tank 11. And, it is adapted to follow the back and forth movement of the core tank 11.

The connector 12 has the front part 12b inserted through an opening 13c formed in the rear of a hollow cylindrical member 13 having an outer step 13a and an inner step 13b at its front end, and the cylindrical member 13 has an outer surface The inner step 3b formed on the front inner surface of the barrel main body 3 is locked between the projection 13d formed in the above and the outer step 13a.
Further, a chuck spring 14 is disposed between the inner step 13 b of the cylindrical member 13 and the front end of the connecting member 12, and the connecting member 12 is moved backward by the chuck spring 14 in contact with the inner flange 13 b of the cylindrical member 13. The head 6 c of the chuck 6, whose rear end 6 b is inserted into the opening 12 c of the connector 12, is tightened with a tightening ring 15 in contact with the inner step 13 b of the cylindrical member 13. Is pinched so that it does not move backward with writing pressure. The chuck 6 of the present embodiment is loosely fitted in the window 13 e of the cylindrical member 13, and the head 6 c is divided into three to hold the writing core 5.

  When the writing core 5 is fed out from the tip 8 b of the sliding body 8, the connecting body 12 and the chuck 6 are advanced by the core tank 11 which is advanced by the pushing action of the knock body 10 and externally fitted on the head 6 c of the chuck 6 The writing ring 5 is advanced until the tightening ring 15 abuts against the projection 3c formed on the inner surface of the barrel body 3 and the chuck 6 is opened, and the front end 5a of the writing core 5 is opened from the opening of the tip 8b of the sliding body 8 Can be projected.

Next, the state of use of the mechanical pencil of this embodiment will be described.
As shown in FIG. 2, while writing on the paper surface S by tilting the barrel body 3 as shown in FIG. 2, the writing pressure on the writing core 5 is oblique to the axis of the barrel body 3. In the case where the pressing force is strong, as shown in FIG. 3, the pressing portion 3a which is the tapered surface of the barrel body 3 relatively advances the pressed portion 8a which is also the tapered surface of the sliding member 8, The inner ring 8c of 8 pulls the outer ring 6a of the chuck 6 forward, the chuck 6 is released from the squeezing ring 15, and the writing core 5 held by the chuck 6 is inserted into the tip 8b of the sliding body 8 The user was able to recognize the situation where the core folding prevention function was activated without the front end 5a of the writing core 5 being broken.
In addition, when re-writing, the user pushes the knocking body 10 and performs an operation of drawing out the writing core 5, so that writing is not continuously performed with strong writing pressure, and it is unknown without knowing There was no possibility that the side of the writing core 5 was scraped and thinned inside.

1: Mechanical pencil, 2: Axial cylinder
3 ... barrel main body, 3a ... pressing portion, 3b ... inner step, 3c ... projection,
4 ... first end body, 4a ... opening,
5 ... writing core, 5a ... front end,
6 ... chuck, 6a ... mantle, 6b ... rear end,
6c ... head,
7 ... core feeding unit,
8: sliding body, 8a: pressed portion, 8b: tip portion,
8c ... inner circle,
9 ... core holder,
10 ... knocking body,
11: core tank 11a: opening portion
12 ... connected body, 12a ... rear part, 12b ... front part,
12c ... opening,
13 ... cylindrical member, 13a ... outer step, 13b ... inner step,
13c: opening, 13d: projection, 13e: window,
14 ... Chuck spring,
15 ... Fastening ring,
S ... space.

Claims (1)

A barrel delivery unit having a barrel body constituting a barrel, a tip body fixed to the front of the barrel body, a chuck for drawing out a writing core, and a tip delivery member disposed inside the tip body. And a slide body having a tip end portion projecting from the mouth body, and an outer collar is provided at a front portion of the chuck, and an inner collar for locking to the outer collar is provided at a rear portion of the slide body. The axial cylinder main body has a pressing portion in the front region, and the sliding body has a pressed portion in the rear region, and at least one of the pressing portion and the pressed portion is And the taper ring of the core feeding unit squeezes the chuck before the sliding body tilts with respect to the barrel body, and the sliding surface is tapered. When the moving body tilts with respect to the barrel body, the pressing portion may press the pressed portion. Said flange is pulling the outer flange to the front by causing the advance, mechanical pencil the chuck is characterized in that it is released from the choke ring.

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