JP2017226185A - Lead feeding mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead feeding mechanism comprising metal parts using materials containing no lead component or a trace quantity of lead component in order to reduce impact on environmental load and human bodies.SOLUTION: A lead feeding mechanism comprises: a barrel 20; and a lead feeding unit 30 for feeding a bar-shaped lead 6 stored in the barrel 20 through a tip of the barrel 20. The lead feeding unit 30 comprises at least: a chuck 7; a fastening member 10; and a chuck spring 12. Multiple parts in the lead feeding unit 30 are composed of metal parts, which are made of metal materials containing lead components of 0.05 mass% or less.SELECTED DRAWING: Figure 1

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 tube, a mechanical pencil lead, colored pencil, crayon, or a rod-shaped core such as solid glue, lipstick, or lip balm is housed, and the tip of the lead is fed out of the shaft tube to project the lead from the tip opening. A core feeding tool that performs writing or coating on a paper surface or the like in a state in which it is applied is well known.

The lead feeding tool described above is used by performing a lead feeding operation and operating a lead feeding unit disposed in the shaft cylinder so that the core projects from the tip opening of the shaft cylinder. The feeding unit usually includes a mechanism for feeding the lead forward by a plurality of parts.
In addition, since the lead feeding tool has a risk of breaking the lead if the lead is excessively protruded from the tip of the shaft tube, it is desirable that the lead is drawn out with a certain length by one operation so that the lead is not excessively drawn. However, in order to always unwind the core with a certain length, some parts that make up the core unwinding unit and other shaft cylinders inevitably require precision and durability, so metal parts may be required. It was.
In the mechanical pencil, the metal part has a thin core to be used in the lead feeding tool, and if the lead feeding amount of one lead is not stable, the lead is easily broken at the portion protruding from the tip opening of the shaft tube. The accuracy and durability of the parts are required, and in particular, it is necessary to use metal parts in the chuck that holds the core. (For example, see Patent Document 1)

  On the other hand, the metal parts of the mechanical pencil described above often use materials containing lead (Pb), which is a free-cutting component, from the viewpoint of workability and cost. Therefore, it is desired to use materials that do not use lead.

JP 2010-162698 A

  The present invention was invented in view of the above-mentioned problems, and in order to reduce the environmental load and the influence on the human body as much as possible, lead components are not contained in the constituent metal parts, or a trace amount of lead components An object of the present invention is to provide a lead-out tool using a material that contains only.

The present invention
“1. A core feeding tool including a shaft cylinder and a core feeding unit that feeds a rod-shaped core housed in the shaft cylinder from the tip of the shaft cylinder, wherein the core feeding unit includes at least a chuck and a clamping screw. A plurality of parts in the lead feeding unit are made of metal parts, and the plurality of parts made of the metal parts are made of a metal material having a lead component of 0.05% by mass or less. The lead feeding tool is characterized in that the lead amount of all the metal parts of the lead feeding unit is 0.05% by mass or less.
2. 2. The lead feeding tool according to claim 1, wherein all the metal parts constituting the lead feeding unit are made of a material not containing a lead component.
3. The core feeding tool according to claim 1 or 2, wherein the metal material used for the metal part contains bismuth (Bi) as a free-cutting substance. Is.

The present invention is based on lead by using a metal material which contains no lead component or contains a very small amount of lead component in a metal component used in the lead feeding unit arranged in the lead feeding tool. Toxicity is eliminated, the burden on the environment is small, and the influence on the human body can be suppressed as much as possible.
Moreover, since the load to an environment is further reduced by using the metal material which hardly contains a lead component for all the metal components which comprise a core feeding unit, it is more preferable.
Furthermore, it is preferable to include bismuth (Bi) as a free-cutting substance in the metal material, so that workability at the time of cutting can be improved while eliminating toxicity due to lead.
Examples of the metal material containing almost no lead component and bismuth (Bi) include copper alloys such as brass, stainless steel materials such as ferritic stainless steel, and aluminum alloys. In particular, compared to copper alloys, stainless steel materials are excellent in corrosion resistance, and therefore can be suitably used in liquids or for a long time.

  The metal parts used in the lead feeding unit disposed in the lead feeding tool are most preferably of the same type, but may be of different types such as a copper alloy and a stainless steel material. However, when different materials are used, the melting point of each metal material is 20% or more, preferably 30% or more, such as aluminum (melting point 660 ° C.), copper alloy (melting point 1000 ° C.), stainless steel material (melting point 1400 ° C.). It is preferable to be different from each other because dissolution and separation are easy.

  Further, in view of the relationship with the core material to be used, stability with time, etc., metal parts used in the core feeding unit can be plated. In this case, it is important that the plating does not contain a lead component as in the case of metal parts, or contains only a very small amount (0.05% by mass or less) of the lead component in the total amount of the metal parts and plating. . The plating method is not particularly limited, such as electroplating or electroless plating.

  In addition, the lead (Pb) contained in the metal part is, for example, JIS H 1053: 2009 (lead determination method in copper and copper alloy) or JIS H 1366: 2002 (lead determination method in aluminum and aluminum alloy). In accordance with ICP (Inductively Coupled Plasma) emission spectroscopy or atomic absorption method, or according to JIS G 1229: 1994 (steel-lead determination method) It can be selected and measured appropriately according to the characteristics.

  The present invention uses a metal material that does not contain a lead component or a very small amount of a lead component in the metal component that constitutes the lead feeding unit, thereby ensuring the accuracy and durability of the component. It was possible to provide a lead feeding tool that reduced the impact on the human body and the human body as much as possible.

It is a longitudinal cross-sectional view of the core supply tool of a present Example.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the side from which the core protrudes 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, although a mechanical pencil is demonstrated as a core supply tool in a present Example, this invention is not limited to a following example.

  FIG. 1 is a longitudinal sectional view of the mechanical pencil of this embodiment. As shown in FIG. 1, the mechanical pencil 1 is attached to a cylindrical tube body 2 that is formed in a cylindrical shape, a tip 3 that is screwed into a front portion of the cylindrical tube body 2, and a rear portion of the axial tube body 2. A cylindrical rear cylinder member 4, a cap 5 inserted from the rear of the rear cylinder member 4, and a core 6 that is housed in the shaft cylinder body 2 and protrudes and retracts from the tip opening 3 a of the tip 3. ing. In this embodiment, the shaft cylinder 20 is constituted by the shaft cylinder body 2 and the tip 3.

Inside the shaft cylinder 20, a chuck 7 made of a metal material and having a head 7 a divided into three parts, a connector 8 that is press-fitted and fixed to the rear part of the chuck 7, and a pipe that is press-fitted and fixed to the rear part of the connector 8. The core tank 9 is provided. Further, a fastener 10 made of a metal material is externally fitted to the head 7 a of the chuck 7, and a chuck spring 12, which is an elastic body, is attached between the connector 11 that receives the fastener 10 and the connector 8. The chuck 7 is repelled rearward by stretching at 400 g. The chuck 7 is loosely fitted in the front hole 11 a of the connector 11.
Thus, the chuck 7, the connector 8, the lead tank 9, the fastener 10, and the chuck spring 12 constitute a lead feeding unit 30 that moves back and forth to feed the lead 6, and the lead feeding unit 30 moves back and forth with respect to the connector 11. It is configured to be movable and rotatable.

  The connector 11 is formed with a cylindrical portion 11b extending rearward, and the cylindrical portion 11b includes convex portions 11c formed at two opposing positions on the outer surface, and the front hole portion of the shaft cylinder main body 2 is formed. By inserting the cylindrical portion 11b of the connector 11 into 2a, the convex portion 11c is overcome and fitted, and the shaft cylinder body 2 and the connector 11 are mounted.

  The front port 3 is screwed to the shaft tube 20 in a state in which the flange 11d of the connector 11 is sandwiched between the front end of the shaft tube main body 2 and the first inner step portion 3b of the front port 3. In addition, the tip 3 incorporates a lead holder 13 made of synthetic rubber that holds the lead 6 with an appropriate force.

  The fastener 10 is externally fitted to the head 7a of the chuck 7, and is loosely fitted between the front end portion 11e of the connector 11 and the second inner step portion 3c on the inner surface of the front opening so as to be movable back and forth.

  A weight body 14 obtained by cutting metal into a cylindrical shape is loosely fitted to the core tank 9 so as to be movable back and forth with respect to the core tank 9.

  The connector 8 is provided with elastic pieces 8b extending circumferentially in two circumferential directions at two opposing portions of the base 8a. In addition, a protruding portion 8c is formed at the tip of each of the two elastic pieces 8b so as to protrude rearward in the axial direction. As a result, the pusher 8 is formed with an abutting portion 8d for abutting the tip of the weight body 14 to prevent forward movement. When the weight body 14 comes into contact with the contact portion 8d, the elastic force 8b absorbs the impact force at the time of contact, and the chuck 7 and the lead tank 9 are advanced to advance the lead tank. The core 6 accommodated in 9 can be fed out.

A rear cylinder member 4 is inserted in the rear part of the shaft cylinder main body 2. The rear cylinder member 4 includes an outer cylinder part 4a that protrudes rearward from the rear end part of the shaft cylinder main body 2 and has a holding piece 4b, and an inner cylinder part 4c that extends in the rear end part of the shaft cylinder main body 2 in the axial direction. It consists of and. Moreover, the inner hole of the outer cylinder part 4a is formed larger diameter than the inner hole of the inner cylinder part 4c.
Guide holes 4d that communicate with the inside and outside of the inner cylinder portion 4c and extend back and forth are formed at two opposing positions on the outer surface of the inner cylinder portion 4c. Further, the inner cylindrical portion 4c is formed with a locking projection 4e protruding outward, and the locking projection 4e is engaged with the locking hole 2b formed in the shaft body 2 so as to be movable back and forth. The rear cylinder member 4 is not rotated or detached from the shaft body 2.

A knock body 15 is disposed behind the lead tank 9 and inside the rear cylinder member 4. The knock body 15 has an eraser insertion portion 15a at the rear portion and a front hole 15b at the front portion, and a bottom portion 15c with which the rear end of the core tank 9 abuts is formed in the front hole 15b.
Further, the locking projection 15d formed on the outer surface of the knock body 15 is locked in the guide hole 4d formed in the inner cylinder portion 4c of the rear cylinder member 4, and the locking projection 15d is formed at the rear end of the guide hole 4d. By making contact, the knock body 15 is configured not to come out of the rear cylinder member 4.
Further, the knock body 15 is formed with a hook-shaped spring receiving portion 15e on the outer periphery. Further, the knock body 15 is repelled rearward by stretching a knock spring 16 between the spring receiving portion 15e and the rear hole step portion 4f of the rear cylinder member 4.

  An eraser 17 is inserted into the eraser insertion portion 15 a of the knock body 15. Further, the cap 5 is detachably attached to the rear portion of the knock body 15 with the front end abutting against the spring receiving portion 15e.

Here, the metal parts used for the mechanical pencil 1 of the present embodiment are the chuck 7, the fastener 10, the chuck spring 12, the knock spring 16, and the weight body 14.
Further, since the chuck 7 and the fastener 10 affect the gripping force of the lead 6 and the lead feeding amount in one lead feeding operation, machining accuracy is required, and the lead component contains only a very small amount of 0.01% by mass or less. Is formed by cutting brass containing 1.5% by mass of bismuth (Bi), and has high machinability by containing bismuth which is a free-cutting substance, Even if it did not contain a lead component, the chuck 7 and the fastener 10 with high processing accuracy were obtained.
Furthermore, the chuck spring 12 and the knock spring 16 are made of a stainless steel material that does not contain lead at all and is spring-processed by electroless nickel plating (lead component 0.01% by mass or less). Was formed by cutting using ferritic stainless steel containing bismuth.
Therefore, the lead component contained in all the metal parts used in the mechanical pencil 1 can be reduced to 0.05% by mass or less with respect to the total weight of all the metal parts. A mechanical pencil 1 with little influence on the surface was obtained.
Furthermore, parts other than metal parts are formed by resin molding, and since the molding material does not contain lead, the burden on the environment is smaller.

  The lead feeding tool of the present invention is not limited to writing tools such as mechanical pencils, colored pencils, and crayons, and can be widely used for cosmetics and medical instruments.

1 ... mechanical pencil,
2 ... Shaft cylinder body, 2a ... front hole, 2b ... locking hole,
3 ... tip opening, 3a ... tip opening, 3b ... first inner step, 3c ... second inner step,
4 ... Rear cylinder member, 4a ... Outer cylinder part, 4b ... Nipping piece, 4c ... Inner cylinder part, 4d ... Guide hole,
4e ... locking projection, 4f ... rear hole step,
5 ... Cap,
6 ... Core,
7 ... chuck, 7a ... head,
8 ... Connector, 8a ... Base part, 8b ... Elastic piece, 8c ... Projection part, 8d ... Contact part,
9 ... Core tank,
10 ... Fasteners,
DESCRIPTION OF SYMBOLS 11 ... Connector, 11a ... Front hole, 11b ... Cylindrical part, 11c ... Convex part, 11d ... Gutter part,
11e ... front end,
12 ... Chuck spring,
13 ... Core holder,
14 ... weight body,
15 ... Knock body, 15a ... Eraser insertion part, 15b ... Front hole, 15c ... Bottom part,
15d: locking protrusion, 15e: spring receiving part,
16 ... Knock spring,
17 ... Eraser,
20 ... shaft tube,
30 ... Core feeding unit.

Claims (3)

  A core feeding tool comprising a shaft cylinder and a core feeding unit that feeds a rod-shaped core housed in the shaft cylinder from the tip of the shaft cylinder, wherein the core feeding unit includes at least a chuck, a fastener, and a chuck. Comprising a spring, a plurality of parts in the core feeding unit is composed of metal parts, the plurality of parts composed of the metal parts is a metal material having a lead component of 0.05 mass% or less, The lead feeding tool is characterized in that the lead amount of all the metal parts of the lead feeding unit is formed at 0.05% by mass or less.   2. The lead feeding tool according to claim 1, wherein all metal parts constituting the lead feeding unit are made of a material not containing a lead component.   The core feeding tool according to claim 1 or 2, wherein the metal material used for the metal part contains bismuth (Bi) as a free-cutting substance.

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