JP3147542U - Improved structure of mechanical pencil - Google Patents

Abstract

The present invention provides a mechanical pencil that can be replaced with an eraser and that eliminates additional parts to reduce costs.
A shaft cylinder part includes a core tank part 110 and an outer cylinder part 120. The core tank part 110 is accommodated in the outer cylinder part 120, and a chuck part 113 is provided at a lower end thereof to sandwich the core. The base part 130 is a hollow cone, is connected to the lower end of the outer cylinder part 120, and includes a cradle 133 and a core guide part 134. The cradle 133 is connected to the chuck part 113 inside the lead tank part 110, and the lead guide part 134 is connected to the cradle 133 at the cone end of the cone to guide the lead. The push-down cap 140 is inserted into the upper end of the lead tank portion 110, and a projection 143 is formed upward from the axial center line. The eraser portion has an eraser 150 and at least one spare eraser. A recess hole 151 is provided on one end surface of the eraser 150 and attached to the protrusion 143 of the push-down cap 140.
[Selection] Figure 1

Description

  The present invention relates to an improved structure of a mechanical pencil, and more particularly to an improved structure of a mechanical pencil that can replace an eraser.

Pencils have long been used as a stationery for recording characters and drawing drawings in daily life work and learning.
With the changing times, mechanical pencils were developed.
Mechanical pencils do not need to be sharpened compared to conventional pencils and solve problems such as blisters at the tip of the pen. It is a writing instrument used in everyday life.

Current mechanical pencils have an eraser attached to the top of the pencil to correct mistakes in written documents and drawings.
However, since the eraser attached to a known mechanical pencil has many fixed types, not only does the eraser break when it is used several times, but there is a problem of wear and alteration of the eraser, which is annoying to the user.

  In order to solve this, several solutions have been proposed, such as controlling the movement of the eraser with a roller, adding a rotating cylinder, or providing a mechanism for feeding the eraser from the inside of the mechanical pencil. It was.

However, the above-described conventional improvement technique requires an additional part as a mechanical pencil structure or invites an increase in cost. Therefore, the improvement effect is not ideal.
The present invention has been made in view of the above points, and an object thereof is to provide a mechanical pencil that reduces cost and eliminates additional parts.
Furthermore, the present invention provides a mechanical pencil in which an eraser can be replaced. The main object of the present invention is to provide a mechanical pencil that allows a user to easily replace an eraser.

  The improved structure of the mechanical pencil according to the present invention mainly includes a shaft tube portion, a base portion, a pressing cap, and an eraser portion. The shaft tube portion includes a core tank portion and an outer tube portion. The core tank portion is a hollow tube body, and has two upper and lower open ends and passes through the core. Among them, a chuck part is provided inside the lower opening end to sandwich the core. The chuck part further includes an elastic member and is inserted inside the core tank part. The outer cylinder part is a hollow tube body, has an open end and a closed end, and has an inner diameter of the pipe larger than the outer diameter of the core tank part, and can accommodate the core tank part. Further, a guide hole is provided at the closed end, and the chuck portion of the core tank portion passes through the guide hole.

The base part is a hollow cone, and the bottom and the cone end are each provided with an opening window, the bottom opening window is connected to the closed end of the outer cylinder part, and the cradle and the core guide part are respectively arranged inside the cone. Provide. The cradle is provided at the bottom inside the cone and accepts the chuck inside the core tank. The lead guide unit is connected to the cradle through the cone end of the cone to guide the lead.

  The pressing cap is a short cylindrical hollow casing body, which is provided with a casing upper lid on one end face, an opening window is formed on the other end face, the inner diameter of the opening window is larger than the outer diameter of the core tank section, and the pressing cap is the core. Insert into the upper open end of the tank. A central portion of the casing upper lid forms a protrusion upward from the axis of the pressing cap.

  The eraser portion includes an eraser and at least one spare eraser. The recessed hole provided in the center of the one end surface of the eraser corresponds to the protrusion of the pressing cap, and the eraser is inserted into the pressing cap. The center part of one end face of the spare eraser is also provided with a recess hole corresponding to the protrusion of the pressing cap, and the eraser can be replaced by inserting the spare eraser into the pressing cap.

  The advantages and spirits of the present invention can be further understood from the following detailed description and the accompanying drawings.

[Example 1]
Example 1 will be described in detail with reference to the drawings.
FIG. 1 is a three-dimensional exploded view of an improved mechanical pencil embodiment 1 according to the present invention.
In the figure, the mechanical pencil 100 includes a lead tank part 110, an outer cylinder part 120, a base part 130, a pressing cap 140, an eraser 150, and an O-ring 160.
The core tank part 110 is a hollow casing body and has an upper opening end 111 and a lower opening end 112. A chuck portion 113 is provided inside the lower opening end 112, and a spring 114 is inserted into the outer surface of the chuck portion 113.

  The outer cylinder part 120 is a hollow casing body, the inner diameter of which is larger than the outer diameter of the core tank part 110, and the outer cylinder part 120 has two end faces, an open end 121 and a closed end 122, and both are provided with an outer surface. An opening-like accommodation space is formed inside the cylindrical portion 120, and the core tank portion 110 is accommodated in the accommodation space. The closed end 122 further opens a guide hole 123, and the chuck part 113 and the spring 114 of the core tank part 110 are connected to the base part 130 through the guide hole 123.

  The base part 130 is a hollow casing body, and an opening window 131 is provided at the bottom part of the base part 130, and is coupled to the closed end 122 of the outer cylinder part 120. An opening window 132 is also provided at the cone end of the base part 130. A cradle 133 and a core guide part 134 are further provided inside the base part 130. The cradle 133 is held at the bottom of the base part 130 and is connected to the chuck part 113 of the lead tank part 110. On the other hand, the lead guide 134 is connected to the cradle 133 and guides the lead to the outside through the conical end opening window 132.

  The pressing cap 140 is a short cylindrical hollow casing body. One end surface thereof includes an upper lid casing 141, and the other end surface forms an opening window 142. The central portion of the upper lid casing 141 forms a cylindrical protrusion 143 upward from the axis of the pressing cap. Furthermore, the inner diameter of the push-down cap 140 opening window 142 is larger than the outer diameter of the lead tank part 110, and the push-down cap 140 is inserted into the upper opening end 111 of the lead tank part 110.

  The eraser 150 opens a recess hole 151 along the axial direction from the center of one end surface, and its diameter and depth correspond to the cylindrical protrusion 143 of the push-down cap 140, and the eraser 150 passes through the recess hole 151. Then, it is coupled with the pressing cap 140, and both are fixed by the O-ring 160.

FIG. 2 shows a three-dimensional combination diagram of the mechanical pencil according to the first embodiment of the present invention.
In this figure, the lead tank part 110 passes through the inside of the outer cylinder part 120, a chuck part 113 is provided at the lower opening end thereof, a spring 114 is inserted into the outer edge of the chuck part 113, and the chuck part 113 and the spring 114 are connected to the outer cylinder. It passes through the part guide hole 123 and enters the inside of the base part 130 connected to the outer cylinder part 120, and is coupled with the core guide part 134 inside the base part 130, so that the core of the mechanical pencil is placed outside the base part 130. invite. Further, a push-down cap 140 is provided at the open end above the lead tank portion.

  Further, the pusher cap 140 is inserted with an eraser 150, and the correlation position between the eraser 150 and the pusher cap 140 is fixed by an O-ring 160. Accordingly, the eraser 150 can be removed from or attached to the push-down cap 140 by opening and closing the O-ring 160. Convenient replacement function with other spare erasers.

FIG. 3 is a three-dimensional schematic diagram of a spare eraser in the mechanical pencil according to the first embodiment of the present invention.
In this figure, a spare eraser storage tank 170 has a plurality of spare erasers 180a, 180b and 180c inserted therein, and the central portion of one end surface of the plurality of erasers has axial holes 181a, 181c or recessed holes 181b along the axial direction. The diameter and depth correspond to the cylindrical protrusion 143 of the pressing cap 140, and the spare erasers 180a, 180b and 180c are coupled to the pressing cap 140 to prepare for the replacement of the eraser 150.

[Example 2]
The improved structure of the mechanical pencil according to the present invention can replace the spare eraser by the above combination, and can also be combined by other methods.
FIG. 4 is a three-dimensional combination diagram of the mechanical pencil improved structure embodiment 2 according to the present invention.
In this figure, the mechanical pencil 200 includes a lead tank part 210, an outer cylinder part 220, a base part 230, a pressing cap 240, an eraser 250, an O-ring 260 and a plurality of spare erasers 280a and 280b. The core tank part 210 passes through the inside of the outer cylinder part 220. A chuck part 213 is provided at the lower opening end, and a spring 214 is inserted into the outer edge of the chuck part 213. The chuck part 213 and the spring 214 pass through the outer cylinder part 220, and the inner side of the base part 230 connected to the outer cylinder part 220. Then, the lead of the mechanical pencil is guided to the outside of the base part 230 by coupling with the core guide part 232 inside the base part 230.

  Spare erasers 280a and 280b are short cylindrical hollow casing bodies having a diameter smaller than the inner diameter of the outer cylinder part 220 and having an axial length shorter than the axial length of the outer cylinder part 220. A shaft hole is formed in the center part of the spare eraser 280a, 280b, and the hole diameter corresponds to the diameter of the outer cylinder part of the core tank part 210. Accordingly, the spare erasers 280a and 280b pass through the core tank part 210 and are accommodated in the accommodating space of the outer cylinder part 220.

  A pressing cap 240 is provided at the upper opening end of the lead tank portion 210, an eraser 250 is inserted above the pressing cap 240, and the correlation position between the eraser 250 and the pressing cap 240 is fixed by an O-ring 260. In addition, the eraser 250 can be removed or attached by opening and closing the O-ring 260 and pressing the pressing cap 240, and provides convenient replacement of the spare eraser 280a or 280b.

  The above description is a preferred embodiment of the present invention and is not intended to limit the scope of the claims of the present invention. Therefore, the equivalent changes or modifications according to the claims of the present invention are included in the present invention.

It is the three-dimensional decomposition schematic of Example 1 of the improved structure of the mechanical pencil concerning this invention. It is the solid combination schematic of Example 1 of the improved structure of the mechanical pencil based on this invention. It is the three-dimensional schematic diagram of the spare eraser of Example 1 of the improved structure of the mechanical pencil concerning this invention. It is the three-dimensional combination schematic of Example 2 of the improved structure of the mechanical pencil which concerns on this invention.

Explanation of symbols

100 ... mechanical pencil 110 ... lead tank part 111 ... lead tank part upper opening end 112 ... lead tank part lower opening end 113 ... chuck part 114 ··············································································· Spring 120 ··· Outer cylinder portion 121 ··· Outer cylinder portion opening end 122 ··· Outer cylinder portion closing end 123 ··························································································································································· Opening end 133 141 ... Press-down cap upper cover casing 142 ... Press-down cap opening end 143 ... Press-down cap protrusion 150 ... Eraser 151 ... Eraser recess hole 160 ... ..O-ring 170 ... Spare eraser storage tank 180 ... Spare eraser 180b ... Spare eraser 180c ... Spare eraser 181a ... Spare eraser shaft hole 181b ... Spare eraser recess hole 181c ... Spare eraser shaft hole 200 ... ··· Mechanical pencil 210 ··· Core tank portion 213 ··· Chuck portion 214 ··· Spring 220 · · · Outer tube portion 230 ··· Cap portion 232 ···・ Core guide 240 ··· Press-down cap 250 ··· Eraser 260 ··· O-ring 280a ··· Spare eraser 280b ··· Spare eraser

Claims (7)

In the improved structure of mechanical pencil,
Including a shaft cylinder part, a base part, a pressing cap, and an eraser part,
The shaft cylinder part has a core tank part and an outer cylinder part,
The lead tank part that houses the lead inside has two open ends that allow the lead to pass up and down,
A chuck portion capable of holding a core at the lower opening end is provided,
Furthermore, an elastic member is sheathed on the chuck part,
The outer cylinder part is a hollow body that forms a housing space inside and has an open end and a closed end,
The inner diameter of the hollow body is larger than the outer diameter of the core tank part so as to accommodate the core tank part,
Inserting the opening end of the chuck portion of the lead tank portion into the guide hole provided in the closed end,
The base portion that is hollow and has a cone shape is provided with an opening window at the bottom and the cone end, respectively, and the opening window is connected to the outer cylinder portion and the closed end, respectively.
The cone further includes a cradle attached to a bottom portion inside the cone, and a core guide portion connected to the chuck portion.
The core guide portion is inserted through the cone end of the cone and connected to the cradle to guide the core,
The hollow short press-down cap is provided with an upper lid casing, the inner diameter of the open end formed on the other end surface is larger than the outer diameter of the core tank portion, and the press cap is placed on the upper open end of the core tank portion. Insert,
Protruding portions are provided upward in the center of the upper lid casing,
The eraser portion has an eraser and at least one spare eraser,
The eraser is provided with a recessed hole in the center of one end surface thereof,
Forming the inner diameter and depth of the recessed hole corresponding to the protrusion of the pressing cap;
Insert the eraser part into the pressing cap,
The at least one spare eraser has a recess hole in the center thereof,
The inner diameter and depth of the recess hole correspond to the protrusion of the pressing cap,
An improved structure of a mechanical pencil, wherein the spare eraser is inserted into the push-down cap so that the eraser portion can be replaced.   2. The mechanical pencil improved structure according to claim 1, wherein the elastic member of the core tank portion is a spring.   The improved structure of a mechanical pencil according to claim 1, wherein the protruding portion of the push-down cap is a short cylindrical hollow body, and the diameter thereof is equal to the diameter of the core tank portion.   The improved structure of a mechanical pencil according to claim 1, wherein the eraser portion further includes an O-ring inserted into an outer edge coupled to the pressing cap to fix a correlation position between the eraser and the pressing cap.   The recess hole of the eraser passes through the eraser body to form a shaft hole, and the inner diameter of the shaft hole is suitable for the short cylindrical hollow body of the push-down cap, and the eraser is pressed from either end surface. 4. The improved mechanical pencil structure according to claim 3, wherein the mechanical pencil can be inserted into a cap.   The recess hole of the spare eraser forms a shaft hole that passes through the spare eraser body, and the inner diameter of the shaft hole is suitable for the short cylindrical hollow casing body of the push-down cap, and the spare eraser The improved structure of a mechanical pencil according to claim 3, wherein the improved structure can be inserted into the pressing cap.   The spare eraser is a cylindrical body, the outer diameter thereof is smaller than the inner diameter of the outer cylinder portion, the axial length thereof is smaller than the axial length of the outer cylinder portion, and the axial hole inner diameter of the spare eraser 5. The improved mechanical pencil structure according to claim 4, wherein the outer eraser is provided larger than the outer diameter of the lead tank part, and the spare eraser passes through the lead tank part and is accommodated in the outer cylinder part.

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