KR20090056955A - Lead for mechanical pencils - Google Patents

Lead for mechanical pencils Download PDF

Info

Publication number
KR20090056955A
KR20090056955A KR1020090041956A KR20090041956A KR20090056955A KR 20090056955 A KR20090056955 A KR 20090056955A KR 1020090041956 A KR1020090041956 A KR 1020090041956A KR 20090041956 A KR20090041956 A KR 20090041956A KR 20090056955 A KR20090056955 A KR 20090056955A
Authority
KR
South Korea
Prior art keywords
mechanical pencil
shim
present
inclination angle
core
Prior art date
Application number
KR1020090041956A
Other languages
Korean (ko)
Inventor
김준기
Original Assignee
김준기
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 김준기 filed Critical 김준기
Priority to KR1020090041956A priority Critical patent/KR20090056955A/en
Publication of KR20090056955A publication Critical patent/KR20090056955A/en
Priority to PCT/KR2010/002435 priority patent/WO2010131845A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B43K21/02—Writing-core feeding mechanisms
    • B43K21/16—Writing-core feeding mechanisms with stepwise feed of writing-cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B43K21/02—Writing-core feeding mechanisms
    • B43K21/22—Writing-cores gripping means, e.g. chucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K23/00—Holders or connectors for writing implements; Means for protecting the writing-points
    • B43K23/08—Protecting means, e.g. caps
    • B43K23/12—Protecting means, e.g. caps for pens
    • B43K23/128—Protecting means, e.g. caps for pens with spring means
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D13/00—Pencil-leads; Crayon compositions; Chalk compositions
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D13/00—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
    • G05D13/34—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power
    • G05D13/46—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and integral action, i.e. PI regulating devices
    • G05D13/48—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover with auxiliary non-electric power using regulating devices with proportional band and integral action, i.e. PI regulating devices involving resilient restoring mechanisms

Abstract

The mechanical pencil shim according to the present invention has a cylindrical side, and both ends are formed with inclined surfaces that respectively form an inclined angle with respect to the vertical cross section with respect to the longitudinal direction of the cylindrical side. In addition, the inclination angles of both inclined surfaces may be the same, and both inclined surfaces may be parallel to each other. The mechanical pencil shim according to the invention extends its service life.

Description

Lead for mechanical pencils

The present invention relates to shims for use in mechanical pencils.

A pencil is a writing tool that usually bakes a mixture of graphite powder and clay to make a thin core, which is embedded in a rod-shaped wooden body in the longitudinal direction.

On the other hand, the mechanical pencil is a device that can be fixed in a state in which the core protrudes from the body, and when the protruding portion is worn out is a device to advance the core little by little according to the pressing operation. As the material of the shim used in the mechanical pencil, various compositions including graphite, a polymer, a ceramic, and the like are known to be used to improve bending strength and the like.

The structure of a conventional mechanical pencil is well known, and has a structure as shown in FIG. The principle of operation is that the chucking portion 43 having a split piece spreading outward is restrained in the gripping ring 50 by the restoring force of the spring 44, and the shim 2 is pressed and chucked. In this state, when the upper knob of the pencil is pressed, the shim 2 chucked by the chucking portion 43 and the gripping ring 50 moves forward in the first space portion 21 while protruding the shim out of the reinforcement pipe 30. When the chucking portion 43 is further advanced, the gripping ring 50 is caught by the jaws of the first space portion 21 and is separated from the chucking portion 43, and the chucking portion 43 is disposed in the second space portion 22. As the divided piece of) opens, the shim 2 is dechucked, and when the hand is released from the upper knob, the shim 2 is returned to its original chucking state by the restoring force of the spring 44. An extra shim is stored in the sleeve 40 and supplied to the central hole 45 to become a trailing core in contact with the leading core, and the leading core moves forward while repeating chucking and releasing, so that the contact surfaces of the two cores are chucked. It will pass through the bottom of the. Thereafter the preceding core is no longer chucked by the chucking portion 43, but the chucked trailing core provides axial support and can continue to push the preceding core. Conventional shims are molded into faces that are perpendicular to the longitudinal direction at both ends.

However, when the contact surface of the leading and trailing cores is advanced below the lower end of the chucking portion 43 and positioned in the region F of FIG. 1, the preceding core is no longer supported in the circumferential direction. Therefore, when the user writes on the ground using the pencil, the leading core can be slid in the reinforcement pipe 30 and rotated circumferentially by the force applied to the tip of the shim having a locally asymmetrical shape. Even if caught, the continuous blunting of the blunt portion of the leading edge of precedent is deepened. In this case, the user can no longer express thin lines or texts, and the user is offended, and the remaining priority is removed and discarded.

Typically, mechanical pencil shims are provided in a length of 60 to 75 mm. Since the length of the remaining waste is 15 to 20 mm depending on the mechanical pencil, about 20 to 30% of the pencil core material is discarded without being used. This is necessary, there is a waste of resources and environmental problems.

An end structure for preventing shim rotation has been proposed in Korean Utility Model Publication No. 1991-0007827 published on October 7, 1991, but the structure is complicated and difficult to apply to a small diameter shim. It was not commercialized due to its low sex.

The present invention extends the service life of the mechanical pencil shim and saves resources.

Mechanical pencil shim according to an embodiment of the present invention has a cylindrical side, both ends include an inclined surface forming an inclination angle with respect to the vertical cross section with respect to the longitudinal direction of the cylindrical side.

The inclination angle of both inclined surfaces of the mechanical pencil shim according to an embodiment of the present invention may be the same.

Both inclined surfaces of the mechanical pencil shim according to an embodiment of the present invention may be parallel to each other.

The inclination angle of both inclined surfaces of the mechanical pencil shim according to an embodiment of the present invention may be 20 degrees or more and 40 degrees or less.

Mechanical pencil shim according to the present invention has an effect of extending the service life, having a simple structure, excellent in manufacturability, improved writing feeling, and contributes to resource saving and environmental improvement.

Hereinafter, specific embodiments of the mechanical pencil shim according to the present invention will be described. BRIEF DESCRIPTION OF THE DRAWINGS The drawings attached to the present invention are for convenience of description, and their shape and relative scale may be exaggerated or omitted.

Figure 2 is a perspective view of a mechanical pencil shim according to an embodiment of the present invention, Figure 3 is a cross-sectional view of the mechanical pencil shim according to an embodiment of the present invention.

Mechanical pencil shim according to an embodiment of the present invention has a cylindrical side (130), as shown in Figure 2, the upper end and the lower end is inclined angle with respect to the vertical cross section of the cylindrical side in the longitudinal direction The upper inclined surface 110 and the lower inclined surface 120 to form a. Each inclined surface is formed into a substantially flat surface. 3 illustrates a case where an upper inclination angle θ 1 formed by the upper inclined surface 110 and a lower inclination angle θ 2 formed by the lower inclined surface 120 appear in a cross section. By vertical cross section is meant a virtual vertical cross section S 1 , S 2 which is drawn about the longitudinal axis O of the cylinder at the upper and lower ends as shown in FIG. 3.

4 shows a state where the shims are mounted on the mechanical pencil according to an embodiment of the present invention, and the contact surface S of the chucked trailing shim 100b and the leading shim 100a from which the tip is protruded is located in the F region. In this case, the leading core 100a is supported by the reinforcing pipe 30 but is not fixed, and the upper inclined surface of the preceding core 100a is formed by the reaction force of the user pressing the pencil against the ground. Since the lower inclined surface is in pressure contact in the longitudinal direction, the preceding core 100a is prevented from rotating in the circumferential direction. On the contrary, if both ends are perpendicular to the longitudinal direction, as in a conventional shim, since the circumferential braking force is insufficient even if the contact surface is pressed, the leading core 100a rotates in the circumferential direction while the sliding occurs at the contact surface. Done.

Here, even if the upper inclination angle θ 1 and the lower inclination angle θ 2 are different from each other, the lower end of the trailing seam 100b and the upper end of the preceding seam 100a are formed as inclined surfaces, and thus, braking for preventing rotation of the preceding seam 100a. The action is exerted. However, if the upper inclination angle (θ 1 ) and the lower inclination angle (θ 2 ) are the same, the contact surface (S) is wider and more stable support is possible, even if the upper and lower sides of the shim are always in constant contact surface (S) Is formed.

Both inclined surfaces of the mechanical pencil shim according to an embodiment of the present invention may be formed parallel to each other as shown in FIG. Of course, in this case, the upper inclination angle and the lower inclination angle become the same angle θ 0 . In this way, when the two inclined surfaces of the shim are formed in parallel, when the shim is manufactured by extrusion and cut to a certain length, continuous cutting is possible at one inclination angle at the discharge port position of the shim, thereby improving manufacturing efficiency.

The inclination angle may be defined between 0 degrees and 90 degrees as can be seen in FIG. The inclination angle of the inclined surface of the mechanical pencil shim according to an embodiment of the present invention is preferably 10 degrees or more and 40 degrees or less. If the inclination angle is 10 degrees or more, an inclination angle that can prevent rotation of the lead core 100a is provided even in consideration of the manufacturing tolerance and the posture angle of the pencil with respect to the ground. It is preferable to make the inclination angle larger than 20 degrees to prevent the rotation more reliably. In addition, when the inclination angle is 40 degrees or less, excessive lateral component force generated at the inclined contact surface due to the longitudinal reaction applied to the pencil is prevented from breaking the seam in the second space portion 22, and the tip of the seam is excessively It is possible to prevent the disadvantage of sharp edges.

The mechanical pencil shim according to the present invention has a small amount of waste to be discarded, so the service life is extended and is implemented as a simple structure, which is excellent in manufacturability and prevents the rotation of the leading core that is not chucked. It also improves resources and contributes to improving the environment.

The mechanical pencil shim disclosed above is possible in various modifications without departing from the basic idea. Accordingly, all the embodiments disclosed above should be interpreted as illustrative and not restrictive. Therefore, the protection scope of the present invention should be defined according to the appended claims rather than the above-described embodiment. Substitution of equivalents of the appended claims is within the scope of the appended claims.

1 is a cross-sectional view showing an example of a conventional mechanical pencil.

2 is a perspective view of a mechanical pencil shim according to an embodiment of the present invention.

Figure 3 is a cross-sectional view of the mechanical pencil shim according to an embodiment of the present invention.

Figure 4 is an enlarged cross-sectional view showing a state in which the mechanical pencil shim mounted on the mechanical pencil according to an embodiment of the present invention.

5 is a cross-sectional view of a mechanical pencil shim according to another embodiment of the present invention.

Claims (4)

A mechanical pencil shim having a cylindrical side, wherein both ends include an inclined surface that forms an inclined angle with respect to a vertical section in the longitudinal direction of the cylindrical side. The mechanical pencil shim of claim 1, wherein the inclination angles of the inclined surfaces are the same. The mechanical pencil shim of claim 2, wherein the two inclined surfaces are parallel to each other. The mechanical pencil shim according to any one of claims 1 to 3, wherein the inclination angle is 20 degrees or more and 40 degrees or less.
KR1020090041956A 2009-05-14 2009-05-14 Lead for mechanical pencils KR20090056955A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020090041956A KR20090056955A (en) 2009-05-14 2009-05-14 Lead for mechanical pencils
PCT/KR2010/002435 WO2010131845A1 (en) 2009-05-14 2010-04-20 Lead for mechanical pencils

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090041956A KR20090056955A (en) 2009-05-14 2009-05-14 Lead for mechanical pencils

Publications (1)

Publication Number Publication Date
KR20090056955A true KR20090056955A (en) 2009-06-03

Family

ID=40988155

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090041956A KR20090056955A (en) 2009-05-14 2009-05-14 Lead for mechanical pencils

Country Status (2)

Country Link
KR (1) KR20090056955A (en)
WO (1) WO2010131845A1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4382706A (en) * 1980-05-07 1983-05-10 Ancos Co., Ltd. Mechanical pencil
JPS61262194A (en) * 1985-05-16 1986-11-20 岩崎金属工業株式会社 Propelling pencil
KR20040033071A (en) * 2001-09-28 2004-04-17 펜텔 가부시기가이샤 Mechanical pencil

Also Published As

Publication number Publication date
WO2010131845A1 (en) 2010-11-18

Similar Documents

Publication Publication Date Title
EP2425950A1 (en) One-piece cutting head for a drill bit
JP5663329B2 (en) Writing instrument with a capacitive touch pen
KR101514474B1 (en) Drill
JP2010501364A5 (en)
CN106234327B (en) Fishline guiding piece, fishing rod, the lead-frame of fishline guiding piece and lead-frame preparation method
WO2010104101A1 (en) Ballpoint pen tip, ballpoint pen refill, ballpoint pen, and method of manufacturing ballpoint pen tip
KR20090056955A (en) Lead for mechanical pencils
JP2006263462A5 (en)
JP2014161946A (en) Drilling machine
JP6445754B2 (en) Ballpoint pen tip and ballpoint pen using the tip
JP4580822B2 (en) Bar-shaped material feeding container
JP2010099816A (en) Cutting insert
JP3131838U (en) Writing instrument
JP2008162105A (en) Retractable writing utensil
JP6157907B2 (en) Writing instrument
JP2012210745A (en) Writing implement
CN202129884U (en) Novel rubber scraper
JP5476235B2 (en) mechanical pencil
JP2015057328A (en) Writing instrument with capacitance touch pen
KR200493453Y1 (en) writing instrument and retractable element for writing instrument
JP5024941B2 (en) Writing instrument
TWM268121U (en) Cutting portion on a drill bit
JP5444265B2 (en) Cutting tools
JP2005138303A (en) Writing instrument
JP5492710B2 (en) Needle-type ballpoint pen tip reduction tool

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application
E601 Decision to refuse application