JP3285556B2 - mechanical pencil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil, and more particularly, to a mechanical pencil capable of extending a lead by shaking a main body.

[0002]

2. Description of the Related Art In a center-drawing mechanical pencil in which a lead can be paid out by shaking a main body, in addition to operating a lead-out part with a heavy body, a knocking part projecting from a rear end of the main body and a rear end of the main body. Normally, the thumb is used to operate the slide operation piece provided on the side part near the part, so that the lead-out part is manually pulled out of the lead-out part, or the lead projecting from the tip of the main body is returned into the main body. (Japanese Patent Publication No. 5-66280, Japanese Utility Model Publication 5)
No. 46954, Japanese Utility Model Laid-Open No. 4-69187, and the like).

[0003]

The mechanical pencil which can swing out the lead by shaking the main body is characterized in that the lead can be swung out while holding the writing state without changing the mechanical pencil. Although there is an advantage, when returning the lead, it is necessary to operate the knock part protruding from the rear end of the main body or the slide operation piece provided on the side part near the rear end of the main body with your thumb, so it is necessary to change the mechanical pencil , Which detracts from the advantages of the center swing type mechanical pencil.

Further, when a knocking portion is provided at the rear end of the main body or a slide operation portion is provided on a side surface near the rear end of the main body, the appearance is not much different from that of a mechanical pencil having no center swing function. There is a drawback in that it is difficult to understand the appearance of a mechanical pencil that can swing out, and that the operation method is confusing.

[0005] Therefore, the object of the present invention is to make it clear from the outside that the mechanical pencil is capable of swinging out the lead, and when returning the lead coming out of the tip of the body into the body, the body is moved from the writing state. It is an object of the present invention to provide a mechanical pencil that can be easily operated with the thumb of a hand holding the main body without holding the main body.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a weight body is caused to act on a lead-out portion by shaking a main body, and the lead-out portion is actuated to move a weight from a leading end of the main body. A pencil for exposing the weight body on a side surface of the main body at least corresponding to a section in which the weight body acts on the core pay-out portion, and the weight from the opening. The feature is that the body can be operated with fingers.

In the mechanical pencil having the above configuration,
By operating the weight with your fingers from the opening formed on the side of the main body, you can manually extend and return the core, and since the weight is exposed outside the main body, the center swing type Can be emphasized in appearance, and the functional beauty of the product can be enhanced.

[0008] Preferably, the lead-out portion is formed such that the action section of the weight body is located near the fingertip position of the thumb of the hand gripping the main body during writing.

In the mechanical pencil having the above configuration,
When you want to extend the lead without shaking the body between writings, or when you shake the body too much between writings and the lead comes out too much, or when you finish writing and return the lead from the tip of the body Since the weight body can be operated with the fingertip of the thumb holding the main body without having to largely change the main body, the centering operation and the centering operation with the fingers can be performed efficiently.

[0010] More preferably, the rear end of the weight body with respect to the core feeding portion has a rounded shape. With such a configuration, a gentle touch can be given to the finger when pressing the weight with the finger.

[0011]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0012]

1 and 2 show an embodiment of a mechanical pencil according to the present invention. FIG. 1 (a) is a longitudinal sectional view of a substantially front half of the mechanical pencil, and FIG. (C) is a cross-sectional view taken along line 1c-1c in (a). FIG. 2 is a longitudinal sectional view of a substantially front half of the mechanical pencil, showing a state in which the weight body of the mechanical pencil is brought into contact with the contact portion of the lead-out mechanism.

Referring first to FIG. 1, a core feeding portion 5 for feeding out a core 1 is provided inside a main body 2 including an outer cylinder 3 and a leading tool 4 detachably screwed to a front end of the outer cylinder 3.
Is provided. The core feeding portion 5 has a cylindrical core pipe 6 for accommodating the core 1 therein. A flange 7 is formed on the outer periphery of the core pipe 6, and is provided in the vicinity of the distal end of the outer cylinder 3. A spring 9 for urging the core pipe 6 rearward is provided between the spring receiving seat 8 and the front end 7a of the flange portion 7.

A chuck 10 for clamping the core 1 is fixed to the front end of the core pipe 6 so as to move back and forth integrally with the core pipe 6. Are provided movably back and forth in a groove 12 formed between the outer cylinder 3 and the leading tool 4.

The chuck 10 has a plurality of, for example, three resilient chuck pieces formed by a plurality of, for example, three slits extending rearward from a front end thereof. Since the outer circumference of the chuck 10 is tapered from the front end to the rear end, a strong tightening force is generated when the chuck 10 is fitted to the tightening ring 11, and the chuck 10 uses this force to make the core 10 1 can be strongly clamped.

Here, the function of the lead-out portion 5 will be described. When the chuck 10 is moved forward together with the lead pipe 6 against the force of the spring 9, the fastening is performed until the fastening ring 11 contacts the front end of the groove 12. Since the ring 11 advances together with the chuck 10 tightened, the chuck 10
Forward while clamping. And tightening ring 11
When the chuck 10 is further advanced after contacting the front end of the groove 12, the chuck 10 is released from the tightening ring 11, so that the chuck 10 expands due to the elasticity of the chuck 10 and releases the clamping force on the core 1 (advance end. position). Thereafter, when the lead pipe 6 is moved backward by the force of the spring 9, the chuck 10 starts to retreat from the forward end position where the lead 1 is released, but tightens until the tightening ring 11 contacts the rear end of the groove 12. Since the ring 11 retreats together with the chuck 10, the chuck 10 retreats by a fixed distance from the forward end position where the lead 1 is released, in the released state. Therefore, the lead 1 is left at the position where it is fed forward by the chuck 10. Then, when the tightening ring 11 comes into contact with the rear end of the groove 12, the chuck 10 is strongly fitted to the tightening ring 12 by the force of the spring 9, and is clamped by the tightening ring 8, thereby clamping the core 7 with a strong force ( Retreat end position).

The lead-out part 5 of this embodiment draws out the lead 1 from the leading end of the main body 2, that is, the leading end of the leading tool 4 by a substantially constant amount by using the above-mentioned front-rear movement of the chuck 10 and the clamping and releasing operations. Can be done.

Behind the flange 7, a weight 13 is externally slidably inserted in the core pipe 6 in the axial direction, and the weight 13 has an inertia when the outer cylinder 3 of the mechanical pencil is shaken. By acting on the collar portion 7 of the core pipe 6 by force and advancing the chuck 10 from the retracted end position to the advanced end position against the force of the spring 9, the above-described core feeding operation is performed on the core feeding portion 5. That can be done. Therefore, the action section of the weight body 10 with respect to the core feeding section 5 is as follows.
This corresponds to a moving section from a position where the chuck 10 comes into contact with the flange portion 7 at the retreat end position to a point where the chuck 10 is advanced to the advanced end position.

The weight body 13 of this embodiment is slidably and rotatable since it is externally inserted into the cylindrical core pipe 6. Therefore, when the main body 2 is shaken, the weight body 13 and the core pipe 6 are hardly subjected to uneven wear, and the weight body 13 can be smoothly moved in the length direction on the core pipe 6.

Further, a lead holder 14 for guiding the lead 1 in the axial direction is mounted on a leading end of the leading tool 4 via a holding ring 15, while an eraser 17 is held at the rear end of the lead pipe 6. The eraser receiver 16 is fitted with a cap 18 which covers the eraser 17. Here, the eraser pedestal 16 is the core pipe 6
And also serves as a stopper for preventing the weight body 13 from coming off backward. On the other hand, a core supply port 16a communicating with the inside of the core pipe 6 is formed in the eraser receiving base 16, and the core supply port 16a is closed by the eraser 7. Open the wick supply port 16a to open the wick supply port 1
The core 1 can be supplied into the core pipe 6 from 6a.
When a stopper for preventing the weight 13 from being provided separately is provided on the inner periphery of the outer cylinder 3 or the outer periphery of the core pipe 6,
The eraser cradle 16 can be detachably attached to the core pipe 6. In this case, since the core 1 can be supplied into the core pipe 6 by removing the eraser receiver 16 from the core pipe 6, the formation of the core supply port in the eraser receiver 16 itself can be omitted.

A clip 1 is provided on a side surface near the rear end of the outer cylinder 3.
9 are provided. In addition, an opening 20 for exposing the weight body 13 to the outside is formed on the side surface of the outer cylinder 3 at least in a section where the weight body 13 acts on the core feeding section 5. Therefore, by operating the weight body 13 with a finger from the opening 20 formed on the side surface of the outer cylinder 3, the core can be manually fed out and returned. Further, since the weight body 13 is exposed to the outside through the opening 20 of the outer cylinder 3, it is possible to emphasize the appearance of the center-drawing mechanical pencil in appearance, and to enhance the functional beauty of the product. .

The length of the opening 20 is determined by the length of the core feeding portion 5.
The desired purpose can be achieved if the length of the weight body 13 can be exposed to the outside over the working section of the weight body 13 with respect to the above. However, in the embodiment, the shape is extended longer rearward. Thereby, the weight 13 when the main body 2 is shaken
Can be seen from the outside, so that it is possible to make the appearance of the mechanical pencil of the type in which the core 1 is shaken and the core 1 is drawn out. Further, as can be seen from FIG. 1 (c), the opening 20 has a depth up to the vicinity of the center of the outer cylinder 3 in the main body 2, so that the weight body 13 can be easily operated in the front-rear direction. be able to.

Further, in this embodiment, the lead-out portion 5 is formed such that the action section of the weight body 13 is located near the fingertip position of the thumb of the hand holding the main body 2 during writing. Such position adjustment can be easily realized by adjusting the length of the flange portion 7 or the position on the core pipe 6. According to such a configuration, when it is desired to feed out the core 1 without shaking the main body 2 between writings, or when the main body 2 is swung too much between writings, or when the core is excessively protruded, When the body 1 is returned from the tip of the main body 2, the weight body 13 can be operated with the fingertip of the thumb that holds the main body 2 without having to largely hold the main body 2, so that the centering operation and the centering operation with the fingers can be efficiently performed. It can be done well.

Further, the weight 13 in the above embodiment is
Since the rear end of the weight body 13 with respect to the core feeding portion 5 has a round shape, a gentle touch can be given to the weight body 13 when the weight body 13 is pressed with the finger. In addition, since the weight 13 is spherical, the weight 6 is less likely to be caught on the core pipe 6 when the body 2 is shaken to move the weight 13 on the core pipe 6. However, in the present invention, since the outer shape of the weight body 13 is not particularly important, various other shapes can be adopted.

FIG. 3 shows another embodiment of the present invention. In the figure, the same components as those in the above embodiment are denoted by the same reference numerals. In this embodiment, between a spring receiving seat 21 sandwiched between the outer cylinder 3 and the leading tool 4 and a spring receiving seat 22 sandwiched and fixed at a joint portion between the tip of the core pipe 6 and the chuck 10. A spring 9 for urging the core pipe 6 and the chuck 10 rearward is interposed. The tightening ring 11 is fitted on the outer periphery of the chuck 10 and is movable back and forth in a groove 12 formed between the spring receiving seat 21 and the leading tool 4.

FIG. 4 shows still another embodiment of the present invention. In the embodiment shown in FIG. 1, the weight 13 is directly operated, but in the embodiment shown in FIG.
The weight body 13 is configured to be indirectly operated with a finger by a.

FIG. 5 shows still another embodiment of the present invention. In the mechanical pencil of the embodiment shown in FIG. 1, since the eraser table 16 is attached to the rear end of the core pipe 6, the core 1 can be extended by pushing the eraser table 16 forward. In the mechanical pencil shown in FIG.
Is attached to the outer cylinder 3 of the
Can not be delivered. However, there is no hindrance because the manual feeding of the core 1 can be performed by operating the weight 13 with a finger. Since the core pipe 6 is not pushed from the rear end, the deformation of the core pipe 6 can be prevented, and the smooth movement of the weight 13 can be maintained.

[0028]

As is apparent from the above description, according to the present invention, the opening for exposing the weight body is provided on the side surface of the main body at least corresponding to the section where the weight body acts on the core feeding section. Since the weight body can be operated with a finger from this opening, it is easy to see from the outside that it is a mechanical pencil that can swing out the lead, and the lead coming out from the tip of the main body is inside the main body. It is possible to provide a mechanical pencil that can be easily operated with the thumb of the hand holding the main body without switching the main body from the writing state when returning to the original state.

[Brief description of the drawings]

1A and 1B show an embodiment of a mechanical pencil according to the present invention, wherein FIG. 1A is a longitudinal sectional view of a substantially first half of the mechanical pencil, FIG.
(C) is a sectional view taken along line 1c-1c in (a).

FIG. 2 is a longitudinal sectional view of a substantially front half of the mechanical pencil showing a state in which a weight body of the mechanical pencil shown in FIG. 1 is brought into contact with an abutting portion of a lead-out mechanism.

FIG. 3 is a longitudinal sectional view of a main part of a mechanical pencil showing another embodiment of the present invention.

FIG. 4 is a vertical sectional view of a main part of a mechanical pencil showing still another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a main part of a mechanical pencil showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 core 2 main body 3 outer cylinder 4 leading tool 5 core feeding part 6 core pipe 7 flange 8 spring receiving seat 9 spring 10 chuck 11 fastening ring 12 groove 13 weight body

Claims (3)

(57) [Claims] 1. A mechanical pencil, wherein a weight body is caused to act on a lead-out part by shaking a main body, and a lead is drawn out from a tip part of the main body by operation of the lead-out part. A mechanical pencil, wherein an opening for exposing the weight body is formed in a side surface of the main body corresponding to a section acting on the lead-out portion, and the weight body can be operated with a finger from the opening. 2. The core feeding portion according to claim 1, wherein the working section of the weight body is formed near the fingertip position of the thumb of the hand gripping the main body during writing. mechanical pencil. 3. The mechanical pencil according to claim 1, wherein a rear end portion of the weight body with respect to the core feeding portion has a rounded shape.