JP5396680B1 - mechanical pencil - Google Patents

Abstract

The present invention can safely protect the tip provided at the tip of the mechanical pencil, and can commonly use sharp cores of various diameters such as 0.3 mm, 0.5 mm, and 0.7 mm. This relates to an improved mechanical pencil. In the mechanical pencil of the present invention, when the sharp core is supplied to the elastic support member of the chip, the elastic support member elastically holds the sharp core, and the first and second drawer members are sharp. The lead is supported by the holding chuck to the lead tank with the lead as a support shaft. Then, if the rotary handle is rotated in the forward direction or the reverse direction, the first pulling member, the second pulling member, and the chip coupled to the second pulling member draw or rotate the rotary handle relative to each other. Accordingly, when the mechanical pencil of the present invention is not used, the tip can be protected by being pulled inside the rotary handle, and therefore the tip can be prevented from being deformed or damaged by an external impact. In addition, since the mechanical pencil of the present invention can replace the chip, there is an advantage that sharp cores of various diameters can be commonly used for one mechanical pencil.
[Selection] Figure 5

Description

The present invention relates to a mechanical pencil of a writing instrument, and in particular, can safely protect a tip provided at the tip of a mechanical pencil and has various diameters such as 0.3 mm, 0.5 mm, and 0.7 mm. The present invention relates to a mechanical pencil improved so that a sharp core can be commonly used.

A mechanical pencil called a 'mechanical pencil' is a writing instrument that can be used by gradually pushing out a core loaded in a chuck, which is a clamping tool, by an operation that mechanically operates. What is commercialized under the name 'Eversharp' by (William Lee Keeran) is the arrow. This mechanical pencil has been widely used in place of existing pencils since the end of the 1970s because it proved economical that it can be used continuously if only the lead is replenished. It has increased.

As can be seen from the mechanical pencil described in Patent Document 1 of the following prior art document, an existing general mechanical pencil has a core tank provided with a space so that a large number of cores can be built inside. And a chuck for pushing out the sharp core while reciprocating by the elastic action of the coil spring is mounted on the tip of the core tank. In such a conventional mechanical pencil, when an impact is applied to the tip part during use, the tip is frequently bent or broken.

On the other hand, the conventional general mechanical pencil has a structure that can use only one type of diameter core such as 0.3 mm, 0.5 mm, 0.7 mm, etc. When the user wishes to change the writing pattern with a desired thickness, the user has to use a mechanical pencil with a core having a diameter of the corresponding thickness. In order to improve such disadvantages, the couple mechanical pencil of Patent Document 2 below includes a plurality of core tanks in one main body and a chuck that is independently attached to these core tanks. Each chuck has a structure in which sharp cores having different diameters are sandwiched.

In this way, since mechanical pencils were first developed in the 19th century, they have been complemented in various ways in terms of functionality, and are positioned as representative writing tools among students and the general public, but are still improving. It can be said that there is a lot of room.

Korean Registered Patent No. 10-0419967 (patentee: Hong Inki, name: mechanical pencil) Korean Registered Utility Model No. 20-0345854 (Utility Model Holder: Pyo Myung Ok, Name: Couple Mechanical Pencil)

As described above, when an impact is applied to the tip part from the outside during the use of the conventional mechanical pencil, there is a problem that the tip cannot be used any more because the tip bends or breaks due to the impact.

In addition, since the conventional mechanical pencil has a structure that can use only one type of diameter core, when the user wants to change the writing pattern to a thickness desired by the user, such as a thin character or a thick character. However, there is a problem that it is necessary to use a mechanical pencil with a core having a diameter of the corresponding thickness. Furthermore, in the case of a technique such as Patent Document 2 that attempts to improve such problems, not only is the structure complicated, but a core tank and a chuck must be provided separately for each thickness of the sharp core. As a result, the thickness of the mechanical pencil main body is increased.

The present invention was developed in order to improve such conventional problems, and its purpose is to deform the chip by applying an external impact to the chip provided at the tip of the mechanical pencil. Another object of the present invention is to provide a mechanical pencil that can prevent damage.

Another object of the present invention is to provide a mechanical pencil that can be used in common with sharp cores of various diameters and simplified in terms of structure and size.

In order to achieve the above object, a mechanical pencil according to the present invention comprises a cylindrical main body to which a press button for drawing a lead is coupled, and a front end portion of the main body, which is rotatably coupled to a first spiral on an inner peripheral surface. It includes a rotating handle having a groove formed therein, a core tank that is inserted into the main body and incorporates a sharp core, and a sleeve that elastically supports the tip of the core tank relative to a spring. Yes.

Further, the mechanical pencil of the present invention is linearly moved along the sleeve when the lead tank is pressed in accordance with the press operation of the press button by being in close contact with the tip of the lead tank while being partially inserted into the sleeve, and supplying the sharp lead A slider with a passage is included as a component.

Further, the mechanical pencil of the present invention includes a clamping chuck that clamps the mechanical core supplied from the core tank through the slider.

Further, the mechanical pencil of the present invention includes a first protrusion inserted into the first spiral groove in a state of being inserted into the rotary handle, and if the rotary handle is rotated in the forward direction, the first protrusion is As it moves from the rear end of the first spiral groove to the front end, it is pulled out from the rotary handle, and if the rotary handle is rotated in the reverse direction, the first protrusion moves from the front end to the rear end of the first spiral groove. As a result, the first pull-out member, which is drawn into the rotary handle and has a second spiral groove formed in the same direction as the first spiral groove on the inner peripheral surface, is included as a component.

In addition, the mechanical pencil of the present invention includes a second projecting portion that is inserted into the second spiral groove in a state of being inserted into the first drawer member, and the first drawer member is pulled out to a final position. When the first pulling member rotates forward together with the rotary handle, the second protruding portion is pulled out from the first pulling member as the second spiral groove moves from the rear end portion to the tip end portion, and the first pulling member is completely When the first pulling member rotates backward together with the rotary handle while being pulled into the second pulling portion, the second pulling portion is pulled into the first pulling member as the second projecting portion moves from the front end portion to the rear end portion of the second spiral groove. A drawer member is included as a component.

Moreover, the mechanical pencil of the present invention includes a tip that is provided at the tip of the second drawing member and supports the tip of the sharp core as a constituent element.

Further, the mechanical pencil of the present invention is provided on the inner peripheral surface of the chip to support the sharp core, and when the rotary handle is rotated, the first pulling member and the second pulling member are disposed on the holding chuck side under the sharp core. The elastic support member which supports a member is included as a component.

On the other hand, in the mechanical pencil according to the present invention, the tip is formed of a separate member having an internal thread formed on the inner peripheral surface so as to be detachable from the second pull-out member. And a chip fastening end formed with a male screw thread to be fastened.

In the mechanical pencil according to the present invention, the inner peripheral surface of the lead tank may further include a buffer member that reduces an impact applied to the sharp lead.

The mechanical pencil of the present invention can protect the tip by drawing it into the rotary handle when it is not in use, so that the tip can be prevented from being deformed or damaged by an external impact.

In addition, since the mechanical pencil of the present invention can replace the chip, it is possible to commonly use sharp cores of various diameters for one mechanical pencil, thereby enabling users such as thin characters or thick characters to be used. However, it is easy to change the writing pattern to the desired thickness.

It is a perspective view which shows embodiment of the mechanical pencil according to this invention in order of operation. FIG. 3 is an exploded perspective view of a partial cross section for a rotary handle and components coupled thereto in an embodiment of the present invention. It is sectional drawing which shows the form before the extraction | drawer of the chip | tip in embodiment of this invention. It is sectional drawing which shows the form from which the 1st extraction member was pulled out from the state of FIG. It is sectional drawing which shows the form from which the chip | tip was pulled out from the state of FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the following embodiments are given for the purpose of allowing the person having ordinary skill in the art to fully understand the present invention, and can be modified in various forms. The scope of the invention is not limited to the embodiments described below.

FIG. 1 is a perspective view showing an embodiment of a mechanical pencil according to the present invention in the order of operation, and FIG. 2 is an exploded perspective view of a partial cross section of a rotary handle and components coupled thereto in the embodiment of the present invention. 3 to 5 are cross-sectional views sequentially showing the form in which the chip is pulled out in the embodiment of the present invention.

As shown in FIG. 1, the mechanical pencil of the present invention protects the tip 100 at the tip, and the rotary handle 20 with the tip 100 retracted inside the rotary handle 20 attached to the tip of the main body 10. It is characterized by having a structure that can be pulled out by rotating. A specific description of each component of the present invention is as follows.

First, the main body 10 has a cylindrical structure to which a press button 11 for pulling out a sharp core is coupled, like a normal mechanical pencil. For reference, in this specification, the side on which the chip 100 is located is referred to as the “front end” of the main body 10, and the side to which the presser button 11 is coupled is referred to as the “rear end” of the main body 10. The “front end” and the “rear end” are defined as the same side as the case of the main body 10 with respect to the other components mentioned.

A cylindrical rotary handle 20 is coupled to the distal end portion of the main body 10, and the rotary handle 20 is relatively in situ by the rotary coupling portion J as can be seen from FIGS. 3 to 5. It can be rotated. The rotation coupling portion J has a general uneven clamping structure formed along the circumferential surface at a portion where the main body 10 and the rotary handle 20 face each other. The surface material of the rotary handle 20 is preferably made of an elastic material such as rubber so as not to cause a slip when gripped with a hand and to have a comfortable grip. Such a rotary handle 20 has a feature that a first spiral groove 21 is formed on the inner peripheral surface thereof as shown in FIGS.

A core tank 30 containing a sharp core is inserted into the main body 10, but in particular in the present embodiment, a buffer member 31 is provided on the inner peripheral surface of the core tank 30. As a result, the impact applied to the sharp core built in the core tank 30 can be mitigated, and the phenomenon that the sharp core breaks due to external impact can be prevented. For the buffer member 31, a porous material such as sponge or styrofoam or an elastic body such as rubber can be applied.

A slider 40 having a sharp lead supply passage 41 through which a sharp lead is supplied from the lead tank 30 is attached to the tip of the lead tank 30 in close contact with the lead tank 30. A sleeve 60 is attached to the tip of the slider 40 so that the tip of the lead tank 30 is elastically supported by a spring 50 relative to the tip. The front end portion of the slider 40 is partially inserted into the sleeve 60, and the rear end portion is in close contact with the front end portion of the lead tank 30. Move straight.

A sandwiching chuck 70 is installed in the sleeve 60, and the sandwiching chuck 70 sandwiches the sharp lead L supplied from the lead tank 30 through the sharp lead supply passage 41 of the slider 40.

On the other hand, a cylindrical first extraction member 80 is mounted in the rotary handle 20, but a first protrusion 81 is formed on the outer peripheral surface of the rear end portion of the first extraction member 80. The rotating handle 20 is inserted into the first spiral groove 21. A second spiral groove 82 in the same direction as the first spiral groove 21 of the rotary handle 20 is formed on the inner peripheral surface of the first drawing member 80.

The second drawing member 90 is inserted into the first drawing member 80, but the second protruding portion 91 is also formed on the outer peripheral surface of the rear end portion of the second drawing member 90. The protruding portion 91 is inserted into the second spiral groove 82 of the first drawing member 80.

The tip of the second lead member 90 is provided with a tip 100 that supports the tip of the sharp core L. Here, the length from the rear end portion of the second drawing member 90 to the tip portion of the chip 100 is preferably formed to be equal to or smaller than the length from the rear end portion of the first drawing member 80 to the tip portion. Therefore, the chip 100 is also positioned inside the first drawing member 80 together with the second drawing member 90 in a state where the second drawing member 90 is completely inserted into the first drawing member 80 and can be safely protected. . In particular, in this embodiment, a tip fastening end 92 having a male thread formed on the tip end side of the second drawing member 90 protrudes, the tip 100 is made of a separate material independent of the second drawing member 90, and the tip 100. By forming an internal thread that meshes with the external thread of the tip fastening end 92 on the inner peripheral surface of the rear end portion, the tip 100 can be detachably attached to the second extraction member 90.

An elastic support member 110 made of a material such as rubber is attached to the inner peripheral surface of the chip 100, and the sharp core L supplied by the pressing operation of the presser button 11 is inserted into the elastic support member 110. It is supported in the state. In particular, when the sharp core L is inserted into the elastic support member 110, the sharp core L acts as a shaft connecting the second extraction member 90 from the clamping chuck 70, so that the first extraction member 80 and the second extraction member 90 are connected. The effect of being supported on the clamping chuck 70 side is expressed. The elastic support member 110 used in the present invention has a pull-out direction when the first pull-out member 80 and the second pull-out member 90 are pulled out while elastically holding the sharp core L supplied from the core tank 30. In addition to exerting the supporting force to the extent that it moves to the lead tank 30 along the sway, when supplying the sharp lead L according to the press operation of the presser button 11, the elastic lead member 110 is not damaged and the elastic support member 110 can pass through the elasticity. It comes to show power.

Next, the operation of the mechanical pencil according to the embodiment of the present invention configured as described above will be described.
First, before using the mechanical pencil of the present invention, as shown in FIG. 3, the first extraction member 80 is inserted into the innermost side of the rotary handle 20. That is, a state in which the first protrusion 81 formed on the outer peripheral surface of the rear end portion of the first drawing member 80 is positioned on the rear end portion side of the first spiral groove 21 formed on the inner peripheral surface of the rotary handle 20. It is what.

Further, the second drawing member 90 is inserted into the innermost side inside the first drawing member 80. That is, the second projecting portion 91 formed on the outer peripheral surface of the rear end portion of the second drawing member 90 is positioned on the rear end portion side of the second spiral groove 82 formed on the inner peripheral surface of the first pulling member 80. Will come to do. At the same time, the chip 100 attached to the distal end portion of the second extraction member 90 is also completely inserted into the first extraction member 80.

In the state as described above, the mechanical pencil user presses the presser button 11 located at the rear end of the main body 10 to pass the sharp lead L built in the lead tank 30 through the slider 40 and the clamping chuck 70. Then, it is supplied to the elastic support member 110 located inside the chip 100 or to the outlet of the chip 100. As a result, the first drawing member 80 and the second drawing member 90 are supported by the clamping chuck 70 with the sharp core L as a support shaft. Since the clamping chuck 70 is connected to the slider 40 and the lead tank 30 side, the first lead member 80 and the second lead member 90 are eventually supported by the lead tank 30 through the sharp lead L.

Thereafter, when the rotary handle 20 is rotated in the forward direction, the first pulling member 80 is supported on the lead tank 30 side through the sharp lead L together with the second pulling member 90. The first protruding portion 81 moves from the rear end portion of the first spiral groove 21 of the rotary handle 20 to the front end portion, whereby the first drawing member 80 is drawn out of the rotary handle 20. At this time, since the second pulling member 90 is inserted into the first pulling member 80, the second pulling member 90 is inserted into the first pulling member 80 together with the first pulling member 80. To the rotary handle 20.

On the contrary, if the rotary handle 20 is rotated in the opposite direction, the first protrusion 81 of the first pulling member 80 moves from the front end portion of the first spiral groove 21 of the rotary handle 20 to the rear end portion. As a result, the first drawing member 80 is again drawn into the rotary handle 20. Similarly, at this time, the second pulling member 90 is pulled into the rotary handle 20 together with the first pulling member 80.

On the other hand, the state in which the first pull-out member 80 is completely pulled out from the rotary handle 20 (here, “the state in which it is completely pulled out” means that the first pull-out member 80 is detached from the rotary handle 20. In this case, the first projecting portion 81 is positioned at the tip of the first spiral groove 21 to stop further movement. Instead, it rotates with the rotary handle 20.

Therefore, if the rotary handle 20 is continuously rotated in the forward direction in a state where the first drawer member 80 is pulled out from the rotary handle 20 to the final position, the second drawer member inserted into the first drawer member 80 is inserted. 90 second protrusions 91 move from the rear end portion of the second spiral groove 82 of the first extraction member 80 to the front end portion thereof, whereby the second extraction member 90 is extracted from the first extraction member 80. . At this time, the tip 100 positioned at the tip of the second drawing member 90 is also moved integrally with the second drawing member 90 and drawn from the first drawing member 80.

On the other hand, if the rotary handle 20 is rotated in the reverse direction with the first pull-out member 80 fully retracted into the rotary handle 20, the first pull-out member 80 is moved in the reverse direction together with the rotary handle 20. As a result, the second projecting portion 91 of the second pulling member 90 moves from the front end portion of the second spiral groove 82 of the first pulling member 80 to the rear end portion. The drawing member 90 and the chip 100 are drawn into the first drawing member 80.

As described above, in the mechanical pencil of the present invention, when the mechanical lead L is supplied to the elastic support member 110 of the chip 100, the elastic support member 110 elastically holds the sharp lead L, and The first drawing member 80 and the second drawing member 90 are supported by the clamping chuck 70 to the lead tank 30 with the sharp lead L as a support shaft. When the rotary handle 20 is rotated in the forward direction or the reverse direction, the first pulling member 80, the second pulling member 90, and the tip 100 coupled to the second pulling member 90 pull the rotary handle 20 relative to each other. Be drawn. Therefore, when the mechanical pencil of the present invention is not used, the chip 100 can be protected by being pulled inside the rotary handle 20, so that deformation or breakage of the chip 100 due to external impact can be prevented.

On the other hand, the mechanical pencil of the present invention has a structure in which the chip 100 can be attached to and detached from the second drawing member 90 relative to each other. That is, as described above, the tip fastening end 92 having a male thread formed on the tip end side of the second drawing member 90 protrudes, and the tip 100 is formed separately from the second drawing member 90. By forming a female thread that meshes with the male thread of the chip fastening end 92 on the inner peripheral surface of the rear end portion of the chip 100, the chip 100 can attach and detach the second drawing member 90 relative to each other. Therefore, as shown in FIG. 2, the second drawer is provided with separate tips 100, 100 ′, 100 ″ having inner diameters corresponding to sharp cores of various diameters such as 0.3 mm, 0.5 mm, 0.7 mm, etc. If the replacement is applied to the tip fastening end 92 of the member 90, there is an advantage that the sharp core L having various diameters can be commonly used with one mechanical pencil.

The present invention has been described based on the preferred embodiments. However, the present invention is not limited to the above-described embodiments, and a person having ordinary knowledge in this technical field within the scope of the technical idea of the present invention. Various variations are possible.

DESCRIPTION OF SYMBOLS 10 Main body 11 Press button 20 Rotating handle 21 1st spiral groove 30 Core tank 31 Buffer member 40 Slider 41 Sharp core supply passage 50 Spring 60 Sleeve 70 Nipping chuck 80 1st extraction member 81 1st protrusion 82 2nd spiral groove 90 1st 2 extraction member 91 2nd protrusion 92 tip fastening end 100 tip 110 elastic support member J rotation coupling part L sharp core

Claims (3)

A cylindrical body with a presser button for sharp lead extraction,
A rotary handle that is rotatably coupled to the tip of the main body and has a first spiral groove formed on an inner peripheral surface;
A lead tank that is inserted into the body and incorporates a sharp lead;
A sleeve that is elastically supported by a spring relative to the tip of the core tank;
A slider having a sharp lead supply passage that is linearly moved along the sleeve when the lead tank is pressed in accordance with the press operation of the presser button while being partially inserted into the sleeve and in close contact with the tip end portion of the lead tank. When,
A clamping chuck for clamping the sharp core supplied from the core tank through the slider;
When the rotary handle is rotated in the forward direction with the first protrusion inserted into the first spiral groove in a state of being inserted into the rotary handle, the first protrusion is disposed after the first spiral groove. If the rotary handle is rotated in the reverse direction by moving from the end to the tip, the first protrusion rotates by moving from the tip to the rear end of the first spiral groove. A first drawing member drawn into the handle and having a second spiral groove formed in the same direction as the first spiral groove on the inner peripheral surface;
A second protrusion inserted into the second spiral groove in a state of being inserted into the first extraction member, wherein the first extraction member is in a state of being pulled out to a final position; When rotating forward together with the rotary handle, the second protruding portion is pulled out from the first pulling member by moving from the rear end portion of the second spiral groove to the tip end portion, and the first pulling member is completely When the first extraction member rotates in the reverse direction together with the rotary handle in the retracted state, the second protrusion moves from the front end portion to the rear end portion of the second spiral groove, so that the first extraction member moves to the first extraction member. A second drawing member to be drawn;
A tip that is provided at the tip of the second drawing member and supports the tip of the sharp core;
Provided on the inner peripheral surface of the chip to support the sharp core, and when rotating the rotary handle, support the first extraction member and the second extraction member on the holding chuck side under the mediation of the sharp core. A mechanical pencil comprising an elastic support member. The tip is formed of a separate thread having a female thread formed on the inner peripheral surface thereof so as to be detachable from the second pull-out member, and a male thread that is fastened to the female thread is formed on the distal end side of the second pull-out member. The mechanical pencil according to claim 1, further comprising a chip fastening end. 2. The mechanical pencil according to claim 1, wherein the inner peripheral surface of the lead tank is provided with a buffer member that reduces an impact applied to the sharp lead.