JP2017030197A - Core delivery tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a core delivery tool 1 which can reduce a load onto a core 7 and prevent core breakage.SOLUTION: An internal surface 18f of a tongue piece 18b of a holding member 18 is so made as to approach an external surface 30c of a shaft cylinder body 3, whereby an inclined plane 18d of the tongue piece 18b of the holding member 18 is brought into slide contact with a contact part 42c of a tip port body 4 adjacent to the tongue piece 18b of the holding member 18 so as to move the contact part 42c in a direction along a shaft center and moves the tip port body 4 forwards with respect to core delivery mechanism 6 against a resilient force of a resilient body 17, whereby a front end part 7a of a core 7 held by the core delivery mechanism 6 is sunk into the tip port body 4.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a core feeding tool that is used in a state in which a rod-shaped core housed in a shaft tube is fed from the shaft tube and protruded from a tip opening.

  Inside the shaft cylinder, a mechanical pencil, colored pencil, crayon, or a rod-shaped core such as solid glue, lipstick, or lip balm is housed, and the front end of the core is extended from the shaft cylinder so that it protrudes from the tip opening. Well-known tools for writing or applying to a core are well known.

The rod-shaped core itself is easily broken by contact with the outside as a single body. However, when the rod-shaped core is housed inside the shaft tube, there is no contact with the outside, and the core breakage can be prevented.
However, when writing and applying, it is necessary to project the front end of the core from the tip opening of the shaft cylinder as described above, the longer the front end of the core that projects from the tip opening of the shaft cylinder, Alternatively, the higher the writing pressure, the more burden is applied to the front end of the core protruding from the tip opening of the shaft cylinder, and the core is more likely to break, so the front end of the core protrudes from the tip opening of the shaft cylinder in use. There is a demand for a structure that can make the core difficult to break even in such a state.

  In addition, the phenomenon that the front end of the lead breaks during the above-mentioned use is often paper that is placed on a hard desk with a thin core diameter, and can be held by hand such as writing on a notebook. Mechanical pencils that are particularly likely to occur with mechanical pencils that are often used in an unstable state, and for which a solution is considered, are described in, for example, Patent Document 1 and Patent Document 2.

In Patent Document 1, when excessive writing pressure is applied rearward along the axis of the shaft cylinder to the core sandwiched by the chuck, the pressing force is buffered by a buffer spring disposed in the shaft cylinder. Thus, a mechanical pencil having a structure for preventing breakage of the core is described.
In this structure, a shock absorbing spring that expands and contracts in the direction along the shaft center works effectively against the writing pressure when writing with a mechanical pencil shaft standing upright, but when writing while tilting the shaft cylinder With respect to the writing pressure, the buffer spring may not function effectively and the core breakage may not be prevented.

In Patent Document 2, when an oblique writing pressure with respect to the axis of the shaft cylinder is applied to the core sandwiched by the chuck, the entire base is made to be the axis of the shaft main body by a force acting on the base through the core. A mechanical pencil having a structure that tilts relative to the core and reduces core breakage is described.
This structure has the effect of preventing core breakage within the range in which the base can be tilted when an oblique writing pressure is applied to the axial center of the shaft tube, but a stronger brush can be used with the base body fully tilted. If pressure is applied, the core will break.

  Since both Patent Document 1 and Patent Document 2 are configured to function to prevent core breakage via the core by applying writing pressure to the core, the load on the core cannot be avoided, In particular, when the front end portion of the lead protrudes long from the tip opening, the lead is easily broken.

Japanese Utility Model Publication No. 56-130874 JP 2010-264638 A

  This invention is made | formed in view of the said problem, Comprising: It aims at obtaining the lead feeding tool which can reduce the load to a core and can prevent a core breakage.

The present invention
“The shaft tube has a shaft body, a front opening disposed in front of the shaft body, and a grip portion provided at the rear of the front body, and the tip body is provided inside the shaft body. Provided is a tip opening portion through which the lead fed out by the arranged lead feeding mechanism projects, and the gripping portion has a plurality of slits extending forward and backward from the front end and a plurality of tongue pieces separated by the slit. A cylindrical gripping member is provided, a gap is provided between the inner surface of the tongue piece of the gripping member and the outer surface of the shaft cylinder body, and the front end portion of the tongue piece of the gripping member is formed from the inside of the gripping member. An inclined surface that is inclined outwardly outward is formed, and the inclined surface is brought into contact with a contact portion of the tip body adjacent to a front end portion of the tongue piece of the gripping member, and the lead feeding mechanism An elastic body is arranged between the front locking portion provided on the front end and the rear locking portion provided on the front opening, and the inner surface of the tongue piece of the gripping member is disposed on the shaft cylinder By approaching the outer surface of the gripping member, the inclined surface of the tongue piece of the gripping member is brought into sliding contact with the contact portion of the tip body adjacent to the tongue piece of the gripping member, and the corresponding contact portion is aligned with the axis. While moving in the direction, the leading end is advanced with respect to the lead feeding mechanism against the resilience of the bullet, and the front end of the lead sandwiched by the lead feeding mechanism is moved to the tip opening. It is a core feeding tool having a structure to be immersed in the body.

  The lead feeding mechanism in the present invention can be appropriately set depending on the lead used. For mechanical pencils and colored pencils, a known structure for feeding a lead can be used in which the lead is moved forward together with the chuck by pushing the chuck holding the lead in the shaft cylinder forward. In crayons, solid paste, lipsticks, and lip balms, a rotating member fitted rotatably to the rear of the shaft tube is rotated to advance the tray placed inside the shaft tube and press it against the tray It is possible to use a core feeding mechanism having a known structure that feeds the core that has been formed.

The core feeding tool of the present invention has a structure that protects the front end portion of the core protruding from the tip opening portion by the advancement of the front end body by the inner surface of the tongue piece of the gripping member approaching the outer surface of the shaft cylinder body. The operation is performed by the gripping force on the gripping portion of the shaft tube. This is devised in view of the fact that the user tends to grip the grip portion of the shaft tube more strongly as the writing pressure becomes higher in use.
In addition, by providing an inclined surface at the front end portion of the tongue piece of the gripping member and also providing an inclined surface at the contact portion of the front end body, the inclined surfaces are in sliding contact with each other, and a smooth operation is easily obtained.
Further, the lead feeding tool of the present invention can appropriately set the strength of the projecting body disposed between the leading end body and the lead feeding mechanism depending on the strength of the lead used, and in the case of a pliable lead. Use a weakly resilient projectile to make it easier to move forward, and in the case of a hard-to-break core, use a highly resilient projectile to make it harder to advance. That's fine.
As described above, in the lead feeding tool of the present invention, the front end of the lead can be protected by advancing the tip body with the gripping force to the gripping portion of the shaft tube without applying pressure to the lead. It becomes possible to reduce the load on.

  According to the lead feeding tool of the present invention, a lead feeding tool capable of reducing the load on the lead and preventing the lead from breaking can be obtained.

It is a side view of the mechanical pencil of a present Example. It is principal part sectional drawing of FIG. It is a partially expanded sectional view of FIG. It is a perspective view which shows the components structure of the principal part. It is principal part sectional drawing which shows the use condition of the mechanical pencil of a present Example. It is a partially expanded sectional view of FIG.

Hereinafter, the mechanical pencil of the present embodiment will be described with reference to the drawings, but the present invention is not limited to the mechanical pencil, and a colored pencil, crayon, solid paste, lipstick, lip balm, or the like is used. It can be used for a lead feeding tool.
In this embodiment, the side with the writing tip is expressed as the front, and the opposite side is expressed as the rear. Moreover, the side close to the axial center of the shaft cylinder is expressed as inward, and the opposite side is expressed as outward.
In addition, in order to make the explanation easy to understand, the same reference numerals are given to the same members and the same parts in the drawings, and names of members and parts corresponding to the claims are different from the words of the claims. Includes the words in the claims in parentheses.

Hereinafter, the mechanical pencil of the present embodiment will be described with reference to FIGS. The mechanical pencil 1 includes a shaft tube 2 having a shaft tube body 3, a front end body 4 disposed in front of the shaft body 3, and a grip portion 5 provided at the rear of the front end body 4. The body 4 is provided with a front end opening 4a from which a front end 7a of a core 7 fed out by a core feeding mechanism 6 arranged inside the shaft cylinder main body 3 protrudes.
The lead feeding mechanism 6 operates via a lead tank 9 connected to the knock body 8 by pushing the knock body 8 protruded from the rear end of the shaft cylinder 2. The lead tank 9 is connected to a chuck 11 that sandwiches the lead 7 via a cylindrical connecting body 10 in which a rear portion 10a is inserted into an opening 9a of the lead tank 9, and the chuck 11 is connected to the knock body 8 and The lead tank 9 is driven to move back and forth.

The connecting body 10 has a front portion 10b inserted through an opening 12c of a hollow cylindrical member 12 having an outer flange 12a and an inner flange 12b formed at the front end, and the cylindrical member 12 is a protrusion formed on the outer surface. An inner step 30a formed on the front inner surface of the front portion 30 of the shaft tube main body 3 is engaged and fixed between the portion 12d and the outer casing 12a.
Further, a chuck spring 13 is disposed between the inner flange 12b of the cylindrical member 12 and the front end of the coupling body 10, and the coupling body 10 is moved rearward by the chuck spring 13 in contact with the inner flange 12b of the cylindrical member 12. The head 11b of the chuck 11 whose rear end portion 11a is fitted in the opening 10c of the coupling body 10 is tightened with the tightening ring 14 in contact with the inner flange 12b of the cylindrical member 12, and the core 7 is It is pinched so as not to retreat by writing pressure.

Further, a male screw portion 30 b is formed on the outer surface of the front end of the front portion 30 of the shaft cylinder body 3, and a female screw portion 15 a formed on the inner surface of the rear end of the inner front port 15 disposed inside the front port body 4. It is screwed. The inner tip 15 has a front end opening 15b through which the core 7 is inserted at the front end, and a core holder 15c for holding the core 7 is fitted behind the front end opening 15b.
Further, the front end body 4 of the present embodiment is composed of a front end main body 41 and a rear cylindrical body 42, and a female screw portion 41 a formed on the inner surface of the rear end of the front end main body 41 is provided with the rear cylindrical body 42. A male screw portion 42a formed on the outer surface is screwed together to be integrated. Further, a male screw portion 15d is formed on the outer surface of the center of the inner tip 15, and a female screw portion 16b formed on the inner surface of a ring-shaped flange body 16 having a flange (rear locking portion) 16a on the outer side. A coil spring (elastic body) is screwed between the front end portion (rear locking portion) 42b of the rear tubular body 42 of the front opening 4 and the flange (front locking portion) 16a of the flange body 16. By arranging 17, the leading end body 4 is always repelled rearward with respect to the core feeding mechanism 6 to which the flange body 16 is fixed.

When the core 7 consumed by writing is projected from the tip opening 4 a of the front end body 4, the connecting body 10 and the chuck 11 are advanced by the core tank 9 advanced by the pushing motion of the knock body 8, and the head of the chuck 11 is moved forward. The core 7 is advanced by the chuck 11 until the clamping ring 14 that is externally fitted to the portion 11b contacts the rear step portion 15e formed on the inner surface of the inner tip 15 and the chuck 11 is opened. The front end portion 7a of the core 7 can be protruded from the portion 4a.
The forward movement of the chuck 11 is restricted by the front end of the chuck 11 coming into contact with the front step portion 15f formed on the inner surface of the inner tip 15, and when the push of the knock body 8 is stopped after the lead 7 is drawn out, The coupling body 10 and the chuck 11 are retracted by the elastic force of the chuck spring 13, but the core 7 is held by the core holder 15c until the fastening ring 14 tightens the head 11b of the chuck 11 again. 7 can be maintained in a state in which the front end portion 7a protrudes from the tip opening portion 4a.

The front portion 30 of the shaft tube main body 3 of the present embodiment is formed to have a smaller diameter than the intermediate portion 31 of the shaft tube main body 3, and the outer surface 30c of the front portion 30 of the shaft tube main body 3 is covered with the cylindrical gripping member 18. It is. The gripping member 18 has a plurality of slits 18a formed so as to extend backward and forward from the front end and a plurality of tongue pieces 18b divided by the slits 18a.
Further, an inclined surface 18d is formed at the front end portion 18c of the tongue piece 18b of the gripping member 18 so as to be inclined from the inside of the gripping member 18 to the outside at an angle of 60 degrees with respect to the axial center. The rear end portion (contact portion) 42c of the rear cylindrical body 42 to be provided is also inclined by 60 degrees with respect to the axial center, and the inclined surface 18e of the gripping member 18 and the rear end portion ( Abutting portion) 42c abuts against the abutting portion 42c.

The inner surface 18 e of the rear part of the gripping member 18 is formed with an inner diameter that fits tightly to the outer surface 30 c of the front part 30 of the shaft cylinder body 3, and the inner surface 18 f of the front part of the gripping member 18 is the front part 30 of the shaft cylinder body 3. The gap S is provided between the inner surface 18 f of the tongue piece 18 b and the outer surface 30 c of the front portion 30 of the shaft cylinder body 3.
The gripping member 18 disposed in the front portion 30 of the shaft cylinder main body 3 has a rear end of the front end body 4 by a coil spring (elastic body) 17 that repels the front end body 4 backward with respect to the core feeding mechanism 6. The portion (contact portion) 42c and the front end portion (contact portion) 31a of the shaft cylinder main body 3 are pressed against each other.

  Next, the usage state of the mechanical pencil of the present embodiment will be described with reference to FIGS. The mechanical pencil 1 has a shaft cylinder 2 so that the tongue 18b of the gripping member 18 narrows the gap S when the user strongly grips the gripping part 5 of the shaft cylinder 2 when the writing pressure increases during use. The inner surface 18f of the tongue piece 18b of the gripping member 18 is brought close to the outer surface 30c of the shaft barrel body 3 while compressing the coil spring (elastic body) 17, and the tongue piece 18b of the gripping member 18 is inclined. As shown in FIGS. 5 and 6, the surface 18 d is slidably brought into contact with the inclined rear end portion (contact portion) 42 c of the front end body 4 to move the rear end portion (contact portion) 42 c forward. The front end portion 7a of the core 7 was immersed in the front end opening 4a of the front opening 4 and the core breakage could be prevented.

  Further, when the writing pressure is lowered and the grip of the grip portion 5 of the shaft cylinder 2 is weakened, the front end 4 moves rearward due to the elastic force of the coil spring 17 and the front end of the core 7 The portion 7a protrudes again from the tip opening 4a of the tip body 4.

1 ... mechanical pencil,
2 ... shaft tube,
DESCRIPTION OF SYMBOLS 3 ... Shaft cylinder main body, 30 ... Front part, 30a ... Inner stage, 30b ... Male screw part, 30c ... Outer peripheral surface, 31 ... Middle part, 31a ... Front end part (contact part),
DESCRIPTION OF SYMBOLS 4 ... Front opening body, 4a ... Front-end opening part, 41 ... Front opening main body, 41a ... Female screw part, 42 ... Rear cylindrical body, 42a ... Male screw part, 42b ... Front end part (rear locking part), 42c ... Rear end (contact part),
5 ... gripping part,
6 ... Core feeding mechanism,
7 ... core, 7a ... front end,
8 ... Knock body,
9 ... core tank, 9a ... opening,
DESCRIPTION OF SYMBOLS 10 ... Connection body, 10a ... Back part, 10b ... Front part, 10c ... Opening part,
11 ... chuck, 11a ... rear end, 11b ... head,
12 ... Cylindrical member, 12a ... Outer collar, 12b ... Inner collar, 12c ... Opening, 12d ... Projection,
13 ... Chuck spring,
14 ... tightening ring,
15 ... Inner opening, 15a ... Female screw portion, 15b ... Front end opening, 15c ... Core holder, 15d ... Male screw portion, 15e ... Back step portion, 15f ... Front step portion,
16 ... flange body, 16a ... flange (front locking part), 16b ... female screw part,
17 ... Coil spring (bullet),
18 ... gripping member, 18a ... slit, 18b ... tongue, 18c ... front end, 18d ... inclined surface, 18e ... inner surface, inner surface ... 18f,
S ... Gap.

Claims (1)

The shaft tube has a shaft tube main body, a front end body disposed in front of the shaft tube main body, and a grip portion provided at the rear of the front end body, and the shaft tube is disposed inside the shaft tube main body. Provided with a tip opening from which the lead fed out by the lead feeding mechanism protrudes, and the gripping portion has a plurality of slits extending back and forth from the front end toward the rear and a plurality of tongue pieces delimited by the slit. A cylindrical gripping member is arranged, a gap is provided between the inner surface of the tongue piece of the gripping member and the outer surface of the shaft cylinder body, and the front end portion of the tongue piece of the gripping member is exposed from the inside of the gripping member. An inclined surface that is inclined outward toward the direction is formed, and the inclined surface is brought into contact with a contact portion of the tip body adjacent to a front end portion of the tongue piece of the gripping member, and the lead feeding mechanism An elastic body is arranged between the provided front locking portion and the rear locking portion provided on the front opening, and the inner surface of the tongue piece of the gripping member is disposed on the shaft cylinder body. A direction along the axial center by bringing the inclined surface of the tongue piece of the gripping member into sliding contact with the abutment portion of the tip body adjacent to the tongue piece of the gripping member by approaching the outer surface The front end body is advanced against the core feeding mechanism against the resilience of the projectile body, and the front end portion of the core sandwiched by the core feeding mechanism is moved to the front end body. A core feeding tool with a structure to be immersed in.

Images