JP2002192881A - Mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a mechanical pencil of a double chuck type for reducing a loss of lead that the tip chuck requires manufacturing precision and much time for fitting it in and this results in a high cost. SOLUTION: The present mechanical pencil is composed of a feed chuck 8 feeding the lead by an external operation of a holder tube 1 and a fore-end lead holding means which is provided in front of the feed chuck 8 and holds the lead. The fore-end lead holding means holds the lead by an elastic body 13 projecting from the fore end of the holder tube 1 or a tip fitting 11 and fitted to a mouthpiece 12 or a fore-end tip 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispensing chuck which is slidably provided in a shaft cylinder, and a chuck ring is loosely fitted to feed a predetermined amount of a lead, and a lead provided in front thereof is prevented from dropping and retreating. The present invention relates to a mechanical pencil including a tip lead holding means.

[0002]

2. Description of the Related Art Conventionally, a double-chuck mechanical pencil having two slits has been proposed mainly for the purpose of reducing loss cores. For example, there has been proposed a double chuck mechanical pencil using two chucks as described in JP-A-8-207489.

[0003] However, machining accuracy is required for the slit front end chuck because the core must be held so that the core does not fall off and the core can be fed. For this reason, it has been difficult to use a plastic chuck which is inexpensive but has a lower processing accuracy than metal. As a result, a relatively expensive metal chuck had to be used, and the product had to be expensive.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention has the advantage of reducing the loss core, which is the advantage of the above-mentioned conventional double-chuck type mechanical pencil, and is required to have high precision and is relatively expensive. It is an object of the present invention to provide an inexpensive mechanical pencil that has a simple structure, can be easily mass-produced, and is not expensive.

[0005]

To achieve the above object, according to the mechanical pencil of the present invention, a feed-out chuck for feeding out a lead by an operation from the outside of the barrel and a feed chuck provided in front of the feed-out chuck. A mechanical pencil comprising a tip holding means for holding a lead, wherein the tip holding means holds the lead by an elastic body attached to a base or a tip protruding from a tip of a barrel or a tool. .

Further, according to the mechanical pencil of the present invention, a sharpening pen comprises a feed-out chuck for feeding out a lead by operation from the outside of the barrel, and a tip lead holding means provided in front of the feed-out chuck for holding the lead. In the pencil, the tip holding means is composed of a first holding member made of an elastic body and provided with a first core holding portion, and a second holding member made of elastic means and provided with a second core holding portion. Become.

[0007]

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are views showing a fixed-tip mechanical pencil according to Embodiment 1 of the present invention. In the drawing, a shaft cylinder 1 is composed of a front shaft 2 and a rear shaft 3. The front shaft 2 has a flange 21 projecting outward and abutting on the front end surface of the rear shaft 3, and has an inner periphery at an intermediate portion thereof. Is provided with an inner flange 22 with which the rear end of the cushion sleeve 9 described later abuts.

The core tank 5 is slidably provided in the shaft cylinder 1.
Is provided. The cylindrical body 4 with the clip 41 is fitted to the rear end of the core tank 5. Furthermore, this cylinder 4
At the rear end, an eraser 6 is mounted, and a cap 7 for rear end knock is detachably attached to the eraser 6.

A feeding chuck 8 into which a chuck ring 81 is loosely fitted is press-fitted and fixed in the tip of the core tank 5. A cushion sleeve 9 for absorbing excessive writing pressure is provided outside the feeding chuck 8. More specifically, the cushion sleeve 9 has an inner flange 91 at the distal end, and a chuck spring 10 for urging the chuck 8 rearward is provided between the inner flange 91 and the distal end surface of the core tank 5. Have been.

On the other hand, a front tool 11 is attached to the end of the front shaft 2, and a metal or plastic base 12 is fixed to the front end of the front tool 11. The base 12 has a small-diameter thin portion 121 at the front and a large-diameter thick portion 1 at the rear.
22. And this thin part 121
Is provided with a tapered elastic body 13 (first holding member) on the outer periphery of. The tip of the elastic body 13 is in contact with the tip of the thin portion 121 of the base 12 and has an inner flange portion 131 (first core holding portion) for holding the core.

The elastic body 13 has only to have an elastic core holding function. For example, a material such as rubber (NBR, silicone rubber, etc.) and an elastic elastomer are suitable.

Further, a friction member 14 (a second holding member) made of an elastic material such as rubber having a second core holding portion for holding a core on the inner periphery of the tip is provided in the large-diameter thick portion 122 of the base 12. ) Is attached. The rear portion of the friction member 14 is formed with a tapered portion 141 which is gradually thinned rearward so that the core can be easily introduced.

The operation of the mechanical pencil according to the first embodiment of the present invention will be described below. First, a plurality of cores are put into the core tank 5, and the rear end cap 7 is knocked. Then, the feeding chuck 8 is advanced with the lead tank 5 against the spring 10. Then, in the process of advancing the chuck 8, the core is drawn out until the chuck ring 81 comes into contact with the step portion 111 in the leading tool 11, and then the chuck ring 81 is detached from the chuck 8 and the chuck 8 is opened.

When the knocking operation is completed in this state, the chuck 8 is retracted by the urging force of the spring 10 rearward. During this retreating process, the chuck 8 is closed by the chuck ring 81 to hold the core. Further, by repeatedly performing the knocking operation, the lead is projected from the opening of the elastic body 13 through the friction member 14 in the leading tool 11, and becomes in a writable state.
In addition, even when the core is worn and shortened by writing, and is separated from the feeding chuck 8, the inner flange 131 which is the first core holding portion of the elastic body 13 and the friction member 14 as the second holding member are provided.
The core is not dropped because the core is held by the second core holding part which is the inner wall of the tip end.

Even if the core is shortened by writing, the core is held by the inner flange 131 of the elastic body 13 at the tip, so that there is an advantage that the core can be used effectively until the core becomes considerably short. Furthermore, if the core is housed in the barrel 1 and the elastic body 13 at the tip is used, it can be used as a pen tip of a so-called electromagnetic input type touch pen. In this case, since the elastic body 13 has elasticity, there is an advantage that the surface of the touch panel is not damaged or damaged.

(Embodiment 2) Next, FIG. 3 shows Embodiment 2 of the present invention. This figure also shows a mechanical pencil with a fixed tip, similarly to Embodiment 1 described above. Therefore, this mechanical pencil is also similar to the first embodiment in that the base 1
2 is press-fitted and fixed in the front tool 11.

An elastic body 13 is mounted outside the thin portion 121 at the front. That is, the elastic body 13 has the protrusion 132 formed on the inner periphery of the front end, and can hold the core passing therethrough. Then, when the friction member 14 made of the elastic material and the protrusion 132 are inserted into the core, the respective cores are held.

The mechanical pencil according to this embodiment has the same functions and effects as those of the first embodiment.
The effect is obtained.

(Embodiment 3) FIG. 4 shows a tip-end sliding mechanical pencil according to Embodiment 3 of the present invention. That is, this mechanical pencil is of a type in which the lead holding means at the tip slides during writing. In this example, a slider 15 (second holding member) made of plastic is slidably provided in a front tool 11 provided on the front shaft 2. The slider 15 has a core insertion hole 151 through which a core is inserted.

Further, the slider 15 is connected concentrically toward the outer periphery of the rear end of the slider body toward the front, and slides against the inner wall surface of the front tool 11 with a predetermined frictional resistance. At the end of the main body, an expandable lead guiding part 153 (second member) that provides a frictional resistance between the sliding contact part 152 and the inner wall surface of the front tool 11 that is smaller than the frictional resistance between the sliding lead 152 and the inner wall of the body.
Core holding portion).

That is, the slider 15 has a sliding contact portion 152 having a resilient force outward in the radial direction at the rear end portion, a center guiding portion 153 on the inner periphery of the front portion, and the slider 15 with respect to the leading tool 11. It is slidably provided. Note that a tip 16 is provided outside the slider 15.

As is apparent from FIG.
A stopper portion 1624 is formed on the rear inner wall of
A locking step 154 is provided on the outer periphery of the front part of the slider 15 corresponding to the stopper 162. By the engagement relationship between the stopper portion 162 and the locking step portion 154, the slider 15 is positioned so as not to enter the tip tip 16 more than necessary.

Further, an elastic body 13 is attached to the outside of the distal end of the distal end tip 16. Also, this elastic body 1
An inner flange 131 for holding the core is provided at the front end of 3.

When assembling this portion, the elastic body 13 is press-fitted into the distal end of the distal tip 16 from the front so that the inner flange 131 of the distal end of the elastic body 13 wraps around the distal end surface of the distal tip 16. To be provided. Then, the inner flange 131 of the elastic body 13 and the slider 1
Since the lead is held by the lead holding portion of No. 5, it is possible to reduce the loss of the lead as in the case of the above fixed tip mechanical pencil.

(Embodiment 4) FIG. 6 shows a mechanical pencil with a sliding tip according to Embodiment 4 of the present invention. According to this example, the tip 16 is pressed into the front outside of the slider 15 having the second core holding portion, and the elastic body having the protrusion 132 (first core holding portion) outside the tip of the tip 16. 13 is attached.

(Embodiment 5) FIG. 7 shows a mechanical pencil with a sliding tip according to Embodiment 5 of the present invention. According to this example, the distal end of the distal tip 16 is provided with an inner flange 161 that faces inward. Then, the first part is located between the outside of the front part of the slider 15 and the inside of the tip part of the tip 11
A tip 16 as a holding member is provided. An elastic O-ring 18 (first lead holding portion) is locked by an inner flange 161 of the tip tip 16 and the inside of the tip portion with a stopper 17, and the lead is held by the O-ring 18.

That is, an O-ring 18 serving as an elastic body for holding a core is provided in the tip 16 mounted on the front portion of the slider 15.
Is inserted, and the stopper 17 is used to prevent dropping. This mechanism is also applicable to a fixed-point mechanical pencil.

(Embodiment 6) FIG. 8 shows a tip-end sliding mechanical pencil according to Embodiment 6 of the present invention. Comparing this example with the third embodiment (FIG. 4), the elastic body 13 having the inner flange 131 has the same shape, but the types of the tip 16 and the slider 15 are different. That is, small-diameter thin portions 161 and 162 are formed on the front portion and the rear portion of the tip chip 16, respectively.

The rear thin portion 162 is press-fitted and fixed inside the slider 15. An elastic body 13 having a diameter reduced toward the front is attached to the front end of the tip 16 outside the thin portion 161 at the front. Note that an inner flange 131 as a first core holding portion is formed inside the distal end of the elastic body 13. On the other hand, a holding projection 154 as a second core holding portion is formed inside the rear portion of the slider 15. With such a configuration, it is possible to reduce the loss core as in the above embodiments.

[0030]

Since the construction of the present invention is as described above, the machining accuracy is relatively required, and an expensive metal tip chuck is not used, and the loss core is reduced similarly to the double chuck mechanical pencil. Have the advantage of
In addition, there is an effect that the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a fixed-end mechanical pencil according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of a main part of the mechanical pencil of FIG. 1;

FIG. 3 is an enlarged longitudinal sectional view of a main part of a fixed-tip sharpening sill according to a second embodiment of the present invention.

FIG. 4 is an enlarged longitudinal sectional view of a main part of a tip-end sliding mechanical pencil according to Embodiment 3 of the present invention.

FIG. 5 is an enlarged vertical sectional view of a tip portion of FIG.

FIG. 6 is an enlarged longitudinal sectional view of a main part of a mechanical pencil with a sliding tip according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged longitudinal sectional view of a main part of a tip-end sliding mechanical pencil according to Embodiment 5 of the present invention.

FIG. 8 is an enlarged longitudinal sectional view of a main part of a mechanical pencil with a sliding tip according to a sixth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 2 front shaft 21 flange 22 inner flange 3 rear shaft 4 cylinder 41 clip 5 core tank 6 eraser 7 cap 8 feeding chuck 81 chuck ring 9 cushion sleeve 91 inner flange 10 chuck spring 11 forehead 111 step 12 cap ( 1st holding member) 121 Thin portion 122 Thick portion 123 Inclined guide portion 13 Elastic body 131 Inner flange (first core holding portion) 132 Projection (first core holding portion) 14 Friction member (second holding member) 141 Taper Part 15 Slider (second holding member) 151 Core insertion hole 152 Sliding contact part 153 Core guiding part 154 Holding protrusion 16 Tip tip 161 Inner flange 17 Stopper 18 O-ring (first core holding part)

Claims (12)

[Claims] 1. A mechanical pencil comprising a feeding chuck for feeding a lead by an operation from the outside of a barrel and a tip lead holding means provided in front of the feeding chuck to hold the lead. A mechanical pencil, characterized in that the core is held by an elastic body attached to a base or a tip protruding from a tip of a barrel or a tool. 2. A mechanical pencil comprising a feeding chuck for feeding a lead by an operation from the outside of a barrel and a tip lead holding means provided in front of the feeding chuck to hold the lead, wherein the tip holding means comprises: A mechanical pencil comprising: a first holding member made of an elastic body and provided with a first core holding portion; and a second holding member made of elastic means and provided with a second core holding portion. 3. The elastic friction member according to claim 1, wherein the first holding member is provided on a front end of the barrel or a base fixed to a front end of the front end, and the second holding member is mounted on the base. The mechanical pencil according to claim 2, which is a member. 4. The mechanical pencil according to claim 3, wherein the first holding member is mounted outside a base. 5. The mechanical pencil according to claim 4, wherein the first core holding portion of the first holding member is an inner flange formed at a distal end of the elastic body. 6. The mechanical pencil according to claim 4, wherein the one-core holding portion of the first holding member is a projection formed on an inner periphery of a front end portion of the elastic body. 7. The second holding device, wherein the first holding member is attached to a tip end provided at a front end of a shaft cylinder itself or a front portion of a slider slidable on a tip of the front end, and the second holding member is provided. 3. The mechanical pencil according to claim 2, wherein the member is the slider itself. 8. The mechanical pencil according to claim 7, wherein the first holding member comprises an elastic body provided on the outer periphery of the tip tip and having a first core holding portion. 9. The mechanical pencil according to claim 8, wherein the first core holding portion of the first holding member is an inner flange formed at a distal end of the elastic body. 10. The first core holding portion of the first holding member,
The mechanical pencil according to claim 8, wherein the mechanical pencil is a protrusion formed on an inner periphery of a tip portion of the elastic body. 11. The first core holding portion of the first holding member,
9. The mechanical pencil according to claim 8, wherein the mechanical pencil is an O-ring mounted between a stopper provided in a front portion of the tip and an inner flange of the tip. 12. The mechanical pencil according to claim 7, wherein said second lead holding member is a projection projecting into a lead insertion hole formed in a rear inner peripheral portion of the slider.