JP2573491Y2 - mechanical pencil - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention provides a mechanical pencil which can be used as a normal mechanical pencil even if it is provided with a detachable pipe-shaped protective guide on a tool, for example, a mechanical pencil for drafting. The purpose is to:

[0002]

2. Description of the Related Art In a conventional mechanical pencil for drawing, for example, a thin extension is provided at the tip of a leading tool in order to easily move a lead along a corner surface of a ruler. A core pipe, which is thinner and fixed, protrudes from the tip of the extension part, and the core protrudes from the tip of the core pipe. And when drawing a straight line or the like with this drafting pencil, the tip end surface of the extension of the preceding tool,
The outer side of the core pipe is applied to each corner of the ruler. As a result, it is extremely easy to move the core along the side surface of the ruler.

[0003]

However, in the case of the conventional mechanical pencil for drawing, since the core pipe is fixed to the leading tool, it always projects sharply from the extension of the leading tool. Not only is there a problem from the surface, but if you accidentally drop it, bend the core pipe or apply external pressure,
There was a risk of being damaged. Further, there is a problem that clothes and the like are damaged when the mechanical pencil is carried in a pocket or the like. The present invention has been made to solve the above-mentioned problems, and it is intended that a core pipe protruding from an extension of a mechanical pencil's tip be damaged or damage other things such as clothes. It is an object of the present invention to provide a mechanical pencil that can also be used as a normal mechanical pencil for preventing writing.

[0004]

A mechanical pencil according to the present invention includes an outer cylinder having a core feeding mechanism mounted therein, a leading tool provided at a tip of the outer cylinder, and a protection guide. A guide, a tubular body detachably mounted on the tip, a slider arranged slidably in the axial direction inside the tubular body,
And a lead protection pipe attached to the slider.

[0005]

The mechanical pencil according to the present invention can be used not only for drafting or ordinary writing, for example, by selectively attaching and detaching the protective guide, but also, if necessary, using a core protective pipe as a protective guide tube. It can be protruded from the body and immersed in the cylinder of the protection guide.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a mechanical pencil A for drafting to which a protection guide can be detachably attached will be described first. The mechanical pencil A has the same mechanism as a conventional general mechanical pencil, and includes an outer cylinder 1 positioned at the outermost position, a leading tool 2 screwed to the tip of the outer cylinder 1, and an outer cylinder 1. The lead sending mechanism B inserted into the lead tank 3, the lead tank 3, the lead chuck 4 fixed to the tip of the lead tank 3, and the lead chuck 4 are slidable in the axial direction while surrounding the lead chuck 4, and A sleeve 5 loosely fitted to the tip of the core tank 3, a chuck ring 6 fastened to the sleeve 5 in a state surrounding the tip of the lead chuck 4, and a sleeve 5 around the lead chuck 4. (Elastic body) 7 for urging the sleeve 5 toward the leading end of the core tank 3 and a spring (elastic body) 8 for urging the sleeve 5 around the sleeve 5 toward the front side of the holding cylinder 1. And

A knock operation cap 9 is fitted to the rear end of the lead tank 3.
It also serves to protect the eraser (not shown) fitted to the rear end of the camera. A lead 10 is stored in the lead tank 3, and the lead 10 penetrates the lead chuck 4 and the leading tool 2 and protrudes forward of the mechanical pencil 1 during writing. 1
Reference numeral 1 denotes a packing made of an elastic body or the like that applies a predetermined friction pressure to the core 10, and prevents the core 10 from being pulled out.

The operation of the mechanical pencil A will be described. FIG. 1 shows a state in which the lead chuck 4 tightens the lead 10 to prevent the lead from advancing and retreating. When the lead tank 3 is advanced relatively to other members such as the sleeve 5, the tip of the lead chuck 4 advances more than the chuck ring 6, and as a result, the lead chuck 4 Spread to release wick 10 and advance wick 10. When the knocking operation of the cap 9 is released, the lead tank 3 is retracted to the rear end position in the sleeve 5 by the chuck fastening spring 7, and as a result, the lead chuck 4 is in a state where the lead 10 is fastened again.

In this embodiment, the mechanical pencil A is used especially for drafting.
As shown in the figure, an elongated extension 2a is formed, and a core pipe 2b is fixed in the extension 2a.
Is projected further forward than the extension 2a. As a result, the end face of the extension 2a and the core pipe 2b
By making the exposed side surface (usually generally exposed about 4 mm) into contact with each of the corners of the ruler, it becomes easy to draw a straight line or the like along the ruler.

[0010] However, when the mechanical pencil A for drafting is mounted in a pocket of clothes or the like and carried, the fixed core pipe 2b has a sharply protruding distal end, so that there is a problem in terms of safety. At the same time, there are problems such as damage to clothes, bending or breakage of the core pipe 2b.

The protection guide 20 according to the present invention can solve such a problem.
a pipe-shaped cylinder 21 detachably fitted to the
A slider 22 having a core protection pipe 23 slidably fitted therein, and a stopper 24 fitted and fixed to the inner surface of the cylinder 21 so as to regulate the sliding range of the slider 22.
And a resilient member or the like mounted and fixed in the stopper 24, and elastically fits with the core pipe 2b.
And a connecting member 25 for detachably connecting the mechanical pencil A and the mechanical pencil A. It should be noted that there is no packing in the slider 22 for applying a frictional force to the core 10. The removal of the lead 10 is all performed by the packing 11 in the mechanical pencil A. Therefore, the slider 22 operates very smoothly, and even if the protective pipe 23 of the slider 22 comes into contact with the paper surface, the slider 22 retreats sensitively and the like, and there is no discomfort or rough feeling at the time of writing, and the level is very low. High writing comfort is obtained.

The tip of the cylinder 21 is tapered,
The slider 22 can slide freely between the distal end of the cylinder 21 and the stopper 24 as shown by the arrow.
When the rear end of the slider 22 is in contact with the stopper 24, the front end of the lead protection pipe 23 is immersed in the cylinder 21. The outer surface of the tip of the tube 21 is chamfered so as not to have a sharp corner.

Next, the tip protection guide 20 according to the present invention will be described.
Will be described. First, when using the mechanical pencil A for writing characters, the cylinder 2 of the protection guide 20 is used.
1 with the extension 2 of the tip 2 of the mechanical pencil A
The two members are connected to each other by a connecting member 25 which is attached to the periphery of a and held by the core pipe 2b with appropriate friction. In this state, simply knock the cap 9 of the mechanical pencil A,
The tip of the core 10 projecting from the tip of the core pipe 2b of the tip tool 2 passes through the inside of the stopper 24, and
3 and can protrude from the tip of the core protection pipe 23 to the outside.

As described above, writing is performed with the tip of the core 10 protruding from the tip of the core protection pipe 23 and the tip of the core protection pipe 23 protruding from the tip of the cylinder 21. Retreats smoothly and sensitively with the wear of Therefore, since the lead protection pipe 23 protects the side surface of the lead 10, the lead 10 is less likely to be broken and writing becomes easier. Next, when writing is completed and the lead 10 is returned, the tip of the lead 10 is pushed back while the cap 9 is in the knocked state, and the slider 22 and the lead protection pipe 23 are placed together with the lead 10 in the cylinder 21. It is thrown in. Therefore, there is no possibility that the tip of the core protection pipe 23 may damage clothes or other things, or the tip of the core protection pipe 23 may be damaged.

Next, when the mechanical pencil A is used for drafting, the cylinder 21 is pulled out from the core pipe 2b of the leading tool 2 and the protection guide 20 is removed. As a result, the tip surface of the extension 2a of the leading tool 2 and the side surface of the core pipe 2b can be brought into contact with each of the corners of the ruler, making drawing easier. After drawing work is completed, the protection guide 2
0 is fitted to the core pipe 2b of the leading tool 2, and the core protection pipe 2
3 is immersed in the inside of the cylinder 21 so that the core pipe 2
The risk that the b and the core protection pipe 23 may damage clothes is avoided.

FIG. 2 shows a second embodiment, and the configuration of the mechanical pencil A is exactly the same as that of FIG. The difference from the embodiment of FIG. 1 lies in the structure of the protection guide 20, in which the slider 22 and the like are omitted and the overall length of the cylinder 21 is shortened. That is, the core pipe 2b is connected to the inside of the protection guide 20, and the protection guide 20 and the mechanical pencil A are removably connected to each other. As in the embodiment of FIG. In the case of using it for each application, it is possible to obtain the effect that it can be effectively used separately and also that the clothes and the like can be protected from the core pipe 2b.

[0017]

As described above, according to the present invention, the protection guide can be used for drawing or ordinary writing, for example, by selectively attaching and detaching the protection guide to and from the tool. That is, when the protection guide is attached to the leading tool, it is possible to prevent the core pipe projecting from the leading tool from damaging or damaging clothes, etc., and at the same time, in this state, together with the lead, the slider core protecting pipe. By immersing in the inside of the cylinder, this core protection pipe can prevent clothes etc. from being damaged or self-damaging, and it is also excellent in safety, which has recently received special attention effective.

When writing with the protection guide tube fitted on the mechanical pencil, the slider core protection pipe automatically advances or retracts together with the core when writing. Since the side of the core is supported, the core is less likely to break, allowing one-knock for long hours of writing. Also, if the outer cylinder of the tip protection guide is detached from the tip of the mechanical pencil, it is possible to perform drawing with a ruler using the core pipe.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a protection guide, which is a main part of the present invention, is mounted on a mechanical pencil for drafting.

FIG. 2 is a sectional view for explaining the operation of the distal end protection guide of FIG.

[Explanation of symbols]

 A Mechanical pencil for drafting (main body of mechanical pencil) 2 Tip 2b Core pipe 20 Protection guide 21 Tube 22 Slider 23 Core protection pipe 25 Connecting member

Claims (2)

(57) [Scope of request for utility model registration] 1. An outer cylinder (1) having a core feeding mechanism (B) mounted therein, and a tip (2) provided at a tip of the outer cylinder (1).
And a protection guide (20).
0) is a cylindrical body (2) detachably attached to the tip (2).
1), a slider (22) slidably disposed in the cylinder (21) in the axial direction, and a core protection pipe (23) attached to the slider (22). Mechanical pencil. 2. A core pipe (2b) is attached to a tip (2), and a stopper (24) for regulating a sliding range of a slider (22) and a connecting member (25) for gripping the core pipe (2b). 2. The mechanical pencil according to claim 1, wherein the mechanical pencil is arranged in a tubular body.