KR900003813Y1 - Mechanical pencil - Google Patents

Abstract

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Description

Mechanical pencil

1 is a cross-sectional view of a mechanical pencil according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line II-II of FIG.

3 is a cross-sectional view showing another embodiment associated with FIG.

4 is a plan view of the cam barrel.

5 is a cross-sectional view taken along the line VV of FIG.

6 shows the operation of the cam can in unfolded form.

7 is a sectional view showing the main parts of a mechanical pencil according to another embodiment.

FIG. 8 is a cross-sectional view taken along the line VII-VII of FIG. 7.

* Explanation of symbols for main parts of the drawings

1: Front outer tube 7: Leading mechanism

9: lead chuck 14: cam barrel

17: rear outer cylinder 64: cam locking means

S: Feelings

The present invention relates to a mechanical pencil that is to send the pen core through the cam barrel by rotating the rear outer cylinder, and more particularly to a mechanical pencil improved to simplify the internal structure.

In the conventional rotary mechanical pencil, the rear outer cylinder can be freely rotated at the rear end of the front outer cylinder with the pen core pipe equipped with the pen core discharge mechanism at the front end, and the rear outer tube can be rotated to rotate integrally with the rear outer cylinder. A cam barrel is provided, and the lead is sent out by the rotation of the cam barrel.

However, such a conventional rotary mechanical pencil has a problem that it is complicated because the internal structure is complicated and the number of parts required is increased because the cam barrel is equipped, as well as complicated manufacturing and disassembly. .

Accordingly, the present invention has been made to solve the above problems, the purpose is to provide a mechanical pencil that can reduce the manufacturing cost as the number of parts is reduced because the internal structure of the cam barrel is equipped with a simple.

The mechanical pencil of the present invention for achieving the above object, the cam engaging means connected to the rear end of the lead chuck of the pen core feeding mechanism is inserted into the front outer cylinder so as to slide in the axial direction together with the pen core feeding mechanism, and then the rear side. The cam barrel connected to the outer cylinder is inserted into the rear inner portion of the front outer cylinder so that it can be rotated or detached, and the front end of the cam barrel is pressed against and caught by the cam catching means 3.

In the present invention configured as described above, when the cam catching means is inserted into the front outer cylinder together with the lead chuck of the lead delivery mechanism, and the cam barrel connected to the rear outer cylinder is inserted into the rear inner side of the front outer cylinder, the front of the cam barrel As the cam catching means is pressed and filtered, the rear outer cylinder and the front outer cylinder can be detached from each other while being freely rotated so that the writing instrument can be easily assembled.

In such an assembled state, when the rear outer cylinder is rotated in one direction, the cam barrel is rotated integrally therewith, and the locking means which is pressed by the front end of the cam barrel is moved forward, and the rear outer cylinder is moved in the other direction. When rotated by the engaging means is moved back along the front end of the cam barrel is rotated in one body.

Therefore, the cam catching means moves forward and backward by the forward and backward movement of the cam by the forward and reverse rotation of the cam barrel, so that the lead can be sent out and the lead can be retracted and accommodated.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In the mechanical pencil shown in FIG. 1, reference numeral 1 denotes a front outer cylinder, and reference numeral 2 denotes a front inner cylinder inserted into the front outer cylinder 1 so as to be detachable from the rear side. The front end cap (3) is screwed so that the rear portion can be separated so that the front end cap (3) and the front inner cylinder (2) is tightly fixed to each other according to the screw defect.

In addition, the tip cap 3 is arranged so that the slider 4, which is projected from the front side thereof, can be slidably moved in the axial direction, and the slider 4 is easily drawn up by the present applicant, and is a Japanese Utility Model Registration Application. This is described in detail in the application filed as 114277.

The slider 4 is fixed to the lead guide 4a and the back of the lead guide 4a to support the lead S with a constant frictional resistance on the inner circumferential surface thereof, and the tip cap 3 on the outer circumferential surface thereof. It consists of a slider member (4b) and the like to contact the inner peripheral surface of the frictional resistance than the frictional resistance.

Here, the slider member 4b is formed integrally with a synthetic resin such as ABS resin or polyacetyl, and the elastic contact piece supporting the pen core S to be slid in the pen guide 4a with a constant frictional resistance as described above. 4c and the contact piece 4d which is formed in the outer diameter direction of this elastic contact piece 4c, and is slid with respect to the inner peripheral surface of the tip cap 3 with a frictional resistance larger than the said frictional resistance.

On the other hand, the rear portion of the front inner cylinder (2) is formed with a sudden enlarged portion (2a) so that the stairs.

The lead guide 6 is inserted in the front inner cylinder 2 so that the lead guide 6 can slide in the axial direction from the rear side of the sudden enlarged portion 2a, and in front of the lead guide 6 there is a pen delivery mechanism ( 7) is arranged, the pen core delivery mechanism 7 is fitted into the front of the lead guide (6) and the sleeve (8) fitted to slide in the axial direction in the front inner cylinder (2) Lead chuck (9) is inserted so as to be able to move in the axial direction in the slide (8), the chuck fastening ring (10) fitted from the outside in front of the lead chuck (9). The chuck fastening ring 10 is installed elastically between the inward protrusion 8a protruding inwardly from the front end of the slide 8 and both ends of the lead guide 6. ) Is composed of a first spring (11) and the like to elastically support in the forward direction (chucking direction).

In the front inner cylinder 2, a second spring 12 for cushioning to elastically support the sleeve 8 in the forward direction is mounted.

The lead guide 6 is integrally formed at the rear of the pen core through hole 60 and the pen core through hole 60 formed toward the front shaft center near the middle portion thereof, thereby expanding the abrupt expansion of the front inner tube 2. A large diameter cylindrical portion 61 is fitted into the portion 2a so as to slide in the axial direction, and the large diameter cylindrical portion 61 extends into the front outer cylinder 1.

By the way, the lead guide 6 is slid in the front inner cylinder (2) in the axial direction can be reciprocated in the inner inner cylinder (2) so as not to rotate, but the first locking means is caught as As shown in FIG. 2 and FIG. 2, an anti-rotation protrusion 62 integrally formed on the front outer circumferential surface of the large-diameter cylindrical portion 61 of the lead guide 6 has a rear sudden enlarged portion of the front inner cylinder 2. It is fitted to the lateral hole 2b formed in 2a, and is caught. In addition, the locking means may protrude the rotation preventing projection 62 integrally with the sudden enlarged portion 2a, and may form the hole 2b in the axial direction on the outer circumferential surface of the large diameter cylindrical portion 61. .

In addition, as shown in FIG. 3, an inner circumferential surface of the sudden enlarged portion 2a and an outer circumferential surface of the large-diameter cylindrical portion 61 are formed in a polygonal shape, and are caught to be fitted so that they are slidably moved in the axial direction. You may make it a means.

The lead guide 6 is elastically supported in the retreating direction by a third spring 13 elastically installed between the rearward outward protrusion 63 and the rear end of the front inner cylinder 2. The spring 13 is for chucking to fasten the lead chuck 9 to the chucking ring 10 by moving the lead chuck 9 integrally with the lead guide 6. The first spring 11 and the third spring 13 have the same function, and any one of them may be omitted, and as described above, even if both are provided, there is no problem.

In addition, a cam catching member (cam catching means) 64 is integrally formed on the rear peripheral wall of the lead guide 6, and the cam barrel 14 can be rotated at a predetermined position in the front outer cylinder 1 at the rear thereof. Is embedded.

First, the relationship between the cam barrel 14 and the cam catching member 64 will be described.

First, the cam catching member 64 is a stopper surface 65 formed along the axial direction to restrict one-way rotation of the cam barrel 14 and about half of the circumferential wall in front of the stopper surface 65. The inclined surface 66 is provided as much as it is formed.

On the other hand, the cam barrel 14 of the stopper surface 140 (see FIG. 4, FIG. 5) and its stopper surface 140 in the axial direction which is in contact with the stopper surface 65 to be caught and pulled out at the front end thereof. A large cam surface 141 inclined in curvature over about half of the circumference at the front end, and a curved slope inclined from the rear end portion 143 formed at the rear of the large cam surface 141 to the rear of the stopper surface 140. A small cam surface 144 and an intermediate locking portion 145, which are installed from the front end of the small cam surface 144 to the rear end of the stopper surface 140, are provided. The locking portions 145 are formed in concave grooves, respectively.

The rear end of the cam catching member 64 is pressed against the elastic force of the third spring 13 to any one of the large cam surface 141, the rear end catching portion 143, and the small cam surface 144 of the cam barrel 14. In the cam barrel 14, the rear end catching portion 143 is in a writing position, the middle catching portion 145 is in the chuck open fastening position at the time of storing the lead, and the large cam surface 141 is The pen core sending cam surface serving as the pen lead guide 4a is also provided, and the small cam surface 144 is the chuck opening cam surface.

That is, when the cam barrel 14 is rotated in one direction, the cam catching member 64 is pushed out by the large cam surface 141, so that the cam catching member 64 is formed of the large cam surface 141. The front end of the lead guide (4a) is protruded from the tip cap (3) is largely moved forward, so the lead guide (4a) is protruded and then rotates the cam barrel 14 in the reverse direction the large cam surface The cam catching member 64 is advanced by 141, and the pen core S is sent out at the front end of the pen guide 4a. In addition, when the cam barrel 14 is rotated greatly in the reverse direction, the cam catching member 64 is caught by the intermediate catching portion 145 along the small cam surface 144. Keep it.

Therefore, in the above chuck open state, when the pen core S projecting from the front end of the pen lead guide 4a is pressed against the ground, the pen core S enters into the pen lead guide 4a, and then the slider 4 Is entered into the tip cam 3 together with the pen core S to be accommodated.

Therefore, when carrying a writing instrument, there is no phenomenon that the pen lead guide 4a protrudes from the front end of the tip cap 3, so that the garment is protruded by the pen lead that protrudes in front of the pen lead guide 4a. There is no such thing as defilement.

Here, as shown in FIG. 1, a distance (a) of a predetermined interval for preparing a cushion is provided between the rear end of the cam locking member 64 and the rear locking portion 143, that is, writing is performed. If excessive pen pressure is applied to the core (S), such as during the process, the second pipe (12) for the cushion is compressed to prevent the core (S) from being broken, and the core pipe (18) is retracted. Will enter.

In this way, when the fill pipe 18 is retracted and the cam catching member 64 of the lead guide 6 is brought into contact with the cam barrel 14, pressure is applied to the fill delivery mechanism 7 in the forward direction so that the lead chuck 9 is opened. As a result, the lead is slipped accordingly, and since the cushion distance (a) is prepared for the cushion, the lead is prevented from slipping.

In addition, the intermediate ring 15 is fixed to the inner side of the front outer cylinder 1 while being fitted to the outer circumferential surface of the cam barrel 14 so as to rotate freely.

And while the rear cylindrical portion 16 is integrally coupled to the rear end of the cam barrel 14, the rear cylindrical portion 16 is press-fitted so that the rear outer cylinder 13 can be detached, in such a press-fitting state. In this case, the rear cylindrical portion 16 and the rear outer cylinder 17 are coupled to be rotated by the friction coupling force of both of them, so that the rear outer cylinder 17 and the cam barrel 14 are configured to rotate together together. .

On the other hand, as shown in FIG. 1, an axial hole 16a is formed on the outer circumferential surface of the rear cylindrical portion 16 and an anti-rotation protrusion 17a is formed on the inner circumferential surface of the rear outer cylinder 17, respectively. By engaging the anti-rotation protrusion 17a into the hole 16a in the axial direction, the rear cylindrical portion 16 of the cam barrel 14 can be engaged in the rear outer cylinder 17 so as to be pivoted. At this time, any of the locking means may be used.

The cam tube 14 is inserted into the cam barrel 14 so that the peel core pipe 18 can be pulled out from the rear side thereof, and the front portion of the peel core pipe 18 can be separated into the large-diameter cylindrical portion 61 of the lead guide 6. It is inserted.

The cam tube 14 is inserted into the cam barrel 14 so that the peel core pipe 18 can be pulled out from the rear side thereof, and the front portion of the peel core pipe 18 can be separated into the large-diameter cylindrical portion 61 of the lead guide 6. It is inserted.

Accordingly, the fill pipe 18 is made of a fill cartridge, which can be pulled out of the ride guide 6 and the cam barrel 14 in the present embodiment, wherein the fill pipe 18 has the lead at its front end. The guide 6 or the lead chuck 9 may be integrally connected.

In the pen core pipe 18, a pen lead guide member 19 is provided in the front inner portion thereof, and an eraser container 20 is integrally connected to the rear end thereof, and the eraser container 20 has an eraser ( The proximal end of 21) is to be fitted.

Next, a method of assembling the writing instrument will be described.

First, the front inner cylinder (2) is inserted into the front outer cylinder (1), and then the front cap (3) is screwed into the front portion of the front contents (2). The delivery mechanism 7 and the lead guide 6 are unitized together to be mounted in the front outer cylinder 1.

Subsequently, the cam ring 14 is inserted into the rear portion of the front outer cylinder 1, and the intermediate ring 15 is inserted into the rear inner portion of the front outer cylinder 1, and then into the rear of the cam barrel 14 and the rear side thereof. When the lead core pipe 18 is inserted from the front portion of the lead core pipe 18 is fitted into the large-diameter cylindrical portion 61 of the lead guide (6).

Then, when the rear outer cylinder 17 is press-fitted to the rear cylindrical portion 16 of the cam barrel 14 from the rear of the pen core sipe 18, the assembly of the writing instrument is completed.

Next, a description will be given of the operation of the present invention mechanical pencil assembled and assembled as described above.

In the state where the cam catching member 64 of the ride guide 6 is caught by the middle catching portion 145 of the cam barrel 14, both the lead guide 4a and the pen core S are housed in the tip cap 3, In this state, when the rear outer cylinder 17 is rotated greatly in one direction, the cam barrel 14 is rotated integrally with the rear outer cylinder 17 so that the intermediate locking portion 145 and the cam locking member 64 are rotated. ) Is moved to the large cam surface 141 through the small cam surface 144.

Then, the cam catching member 64 is pushed out from the large cam surface 141 so that the lead guide 6 integrated with the cam catching member 64 moves forward to move the slider (7) through the pen core feeding mechanism 7. The lead guide 4a of 4) protrudes from the tip cap 3.

If the rear outer cylinder 17 is rotated in the reverse direction and then rotated a little in one direction again, the cam jam in the large cam surface 141 of the cam barrel 14 to be rotated integrally with the rear outer cylinder 17 The member 64 is advanced again, and accordingly the lead is sent out so that the lead S continues in the lead guide 4a.

And when the forward and reverse rotation of the cam barrel 14 by the rear outer cylinder 17 is repeated, the lead (S) continues to go out to be a suitable length.

In this way, after the delivery of the lead is sent out to the appropriate length, the cam catching member 64 is located in the rear end catching portion 143 of the cam barrel 14 to be in a state capable of writing. When the cam flap 14 is rotated largely in the reverse direction in the rear outer cylinder 17, the cam catching member 64 moves to the small cam surface 144 so that the cam catching member 64 is moved on the small cam surface 144. The lead guide 6 and the lead delivery mechanism 7 are moved forward integrally with the cam catching member 64 by moving forward. In this advance process, the chucking ring 10 is stopped at the front end thereof in contact with the rear end portion 3a of the inside of the tip cap 3, and when the lead chuck 9 moves further forward, the chucking ring 10 The chuck is released to open the chuck, and in this state, the cam catching member 64 is caught by the intermediate catching member 145 to become a fastening state. Therefore, in this state, pressing the pen lead (S) and the lead guide (4a) protruding from the pen lead guide (4a) to the ground, the pen lead (S) and the lead guide (4a) retreat sequentially to the tip cap ( 3) You are going inside.

In addition, since the slider 4 is provided with a predetermined frictional force with respect to the inner circumferential surface of the pen core S and the tip cap 3 by the slider member 4b, the slider guide 4a can be retracted. When there is no knocking operation, simply press the tip of the pen core S to the ground, etc., and the pen core S can protrude to a predetermined length. By using the slider member 4b made of one synthetic resin molded article, not only the configuration can be simplified but also the assembly work can be simplified.

In addition, since the slider member 4b can be made inexpensively in a large amount, it can also be made short, so that the entire length of the mechanical pencil can be shortened.

In this way, while the pen core S is consumed as much as the movable area of the pen guide 4a, it is not necessary to send the pen core back to knock knock operation, and thus it is possible to continue writing without changing the state of holding the writing instrument. Will be.

In FIG. 7, an embodiment different from the above embodiment is shown. In this embodiment, a so-called cushion part 8a which is axially stretched in the rear of the sleeve 8 in FIG. 1 is integrally formed. By replacing the cushion sleeve 8, the second spring 12 in FIG. 1 becomes unnecessary, and in this embodiment, a slider 22 separate from the lead guide 6 is arranged so that this slider ( 22 is inserted into the rear inner portion of the front outer cylinder 1 to be axially slid and engaged to axially rotate so that the slider 22 is elastically supported in the rearward direction by the third spring 13. The rear portion of the cam catching member 64 is formed integrally.

In this embodiment, a cushion distance a is provided between the rear end of the lead guide 6 and the front end of the slider 22 to prepare for the cushion. The effect can be obtained.

According to the present invention as described above, since the cam catching means which is press-engaged and the cam catching means of the cam box is integrated into the unit, the internal structure is simplified and the number of parts can be reduced, but the manufacturing cost can be reduced. Of course, just by inserting the cam barrel into the rear inner portion of the front outer cylinder is connected to the rear outer cylinder can be detachably attached to the rear end of the front outer cylinder can be easily removable, there is an effect such as to assemble the entire writing instrument. .

Claims (2)

By rotating the rear outer cylinder (17) connected to be freely rotated and detached at the rear end of the front outer cylinder (1), the pen core sending mechanism (7) housed in the front outer cylinder (1) is associated with the core (S) In the mechanical pencil that is to send the), the cam catching means (64) fastened so as to be rotated in the front outer cylinder (1) to move in the axial direction together with the pen core delivery mechanism (7), It is connected to the rear outer cylinder 17, while being provided so as to be detachable while rotating inside the rear of the front outer cylinder (1) having a cam barrel 14 and the like to be caught by the cam catching means 64 at its front end, The pencil pencil is characterized in that the rear outer cylinder (14) is rotated to send the pen core (S). The cam tip 14 is rotated in one direction so that the pen lead guide 4a protrudes from the tip cap 3, and the pen tip protrudes. The cam core 141 which slides the cam catching means 63 in a direction in which the pen core S is sequentially discharged from the pen guide 4a is rotated in a reverse direction, and the pen core is rotated in the opposite direction. A small cam surface 144 which slides the cam catching means 64 in a direction for opening the chuck of the feeding mechanism 7 and the cam catching means at the chuck open position of the pen core feeding mechanism 7 64) is provided with a locking portion (145) for returning the fastening state, the pencil guide (4a) is characterized in that the lead guide (4a) is to be accommodated when the lead is stored in the open position of the chuck.