KR880002379Y1 - Mechanical pencil of mechanical pencil - Google Patents

Abstract

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Description

Mechanical pencil of mechanical pencil

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view showing the main parts of a first mechanical pencil with a lead delivery slider of the present invention.

2 is a cross-sectional view of the first embodiment of the present invention.

3 is a perspective view of a slider member according to the present invention.

4 is a front view of FIG.

5 is a side view of FIG.

6 is a cross-sectional view taken along the line A-A of FIG.

* Explanation of symbols for main parts of the drawings

1: outer cylinder 2: tip cap

11: slider member 12: lead guide portion

14: the first sliding movement 17: the second sliding movement

19: stroke

The present invention relates to a mechanical pencil, and more particularly to a pencil-delivery slider of a pencil pencil, which is not intended to be sent out by knock operation, but the pencil is sent out from the pencil guide by simply pressing the pencil on the writing paper. .

When writing with a pencil, the length of the lead that protrudes from the front end of the lead guide is limited to a certain length because of the tendency of the lead to break, and if the length of the lead is shortened due to wear out during writing, The knock button installed at the back end of the peel pipe needs to be knocked out so that the desired length can be sent out.

However, in this handwriting operation, there is a problem that the writing efficiency is lowered because the pencil pencil must be re-fixed to stop the handwriting operation.

On the other hand, in the case of worn out, a pencil is proposed that can send a predetermined amount of pencil without pressing the pencil by pressing the lead to writing paper, for example, the present applicant And those disclosed in Japanese Utility Model Publication No. 56-7506. However, in the conventional technology, a pen tip guide unit which allows the pen core to slide freely and reciprocally to press the pen core on the writing paper so that the pen core can be freely reciprocated, and the cylinder which slides in the tip cap in which the lead guide unit is installed A friction member made of rubber or rubber, which is fixed to the cylinder and the cylindrical body, supports the core with a constant frictional resistance, and comes in contact with the frictional resistance larger than the frictional resistance on the inner circumferential surface of the tip cap. As the number of parts of a structure increases, the structure becomes complicated, and a practical problem arises that the friction member wears out easily.

The present invention was devised to solve the above problems, and it is advantageous in terms of durability, lubricity and manufacturing cost by using a slider member made of a synthetic resin molded product in which the pen delivery mechanism is integrated according to the push operation of the pen. An object thereof is to provide a pencil delivery slider of a pencil.

Hereinafter, the first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an enlarged sectional view of the main part of the first embodiment according to the present invention, and FIG. 2 is an overall sectional view of the embodiment. Here, reference numeral 1 denotes an outer cylinder which is held by hand, and the outer cap 1 is provided with a tip cap 2 integrally therein, and inside the pen core pipe 3 is inserted in parallel with the axis line. The lead chuck 4 is connected to the front end of the lead pipe 3. In addition, the rear end of the core pipe (3) is fitted so that the eraser support (5) into which the eraser rubber (6) can be inserted.

In addition, the front end portion of the lead chuck 4 passes through the center of the chuck ring 7, and the rear portion of the chuck ring 7 is a front portion of the cushion sleeve 8 that can move axially in the outer cylinder 1. It is made to face the flange part 8a. The cushion sleeve 8 is formed of an elastic member that can be deformed, for example, an elastically deformable elastic member such as polyester, so that the entire body is cylindrical in shape, and at the rear end thereof, the cushion sleeve 8 is disposed outside the outer diameter of the trunk portion 8b. A protruding stopper 8c is formed.

In addition, the stopper 8c has a notch 8e at the trunk 8b and a long notch 8e at the rear end along the axial direction so that the stopper 8c can generate a moderately flexible elastic force with respect to the trunk 8b. It is formed. On the other hand, when the cushion sleeve 8 is assembled into the outer cylinder 1 together with the pen core feeding mechanism in the shape of the stopper 8c, the locking hole drilled in the outer cylinder 1 is operated. It is shaped like 1a) so that it can not be swayed and reliably and smoothly so that it will not be pulled out. Accordingly, the trunk portion 8b is deformed at a limit in the axial distance G of the cutout portion 8d with respect to the stopper 8c supported by the locking hole 1a, so that the trunk portion 8b is normally moved forward. It is pushed.

A chucking spring 9 is inserted between the front end of the fill core pipe 3 and the flange portion 8 of the cushion sleeve 8 to push the fill pipe 3 backwards. The tip cap 2 has its tip portion tapered into a conical shape, and an inside of the tip portion is formed with an engaging surface 10, which is an inclined stepped portion that is narrowed while varying its inner diameter, and on the inside edge of the tip portion. A slider member 11 having a stopper surface 11a whose movement in sliding in the axial direction is controlled but whose frontward displacement is restricted by the locking surface 10 is fitted.

The slider member 11 is formed integrally with ABS resin or polyester, and the entire shape thereof is tubular. The slider member 11 is shown in FIGS. 3, 4, 5, and 6 As shown in Fig. 11, the entire body has two cylindrical bodies of different diameters, i.e., reference numeral 11b is a small diameter portion, and reference numeral 11c is a large diameter portion. Inside the center hole, the lead guide portion 12 for passing the lead described later is tightly fitted with an interference fit. However, the lead guide portion 12 and the slider member 11 may be integrally formed here.

In addition, a through hole 11d is formed in the thick portion near the center portion where the small diameter portion 11b and the large diameter portion 11c are connected. On the other hand, the large diameter portion 11c has a shape such as a double cylinder, among which the first cylindrical member 14 having four elasticities is formed in the outer cylindrical portion with the notched portions 13 in the axial direction at equal intervals. ) Is formed. In addition, each protrusion 15 is formed integrally in the vicinity of the cutout portion 13 of each of the first sliding pieces 14, and each of the first sliding pieces 14 has the projections ( The vicinity of the side where 15) is formed is formed by a thin thickness portion 14a, so that the first sliding member 14 is provided with more effective elasticity. The other inner cylindrical portion is provided with a cutout portion 16, whereby a second sliding piece 17 having a pair of weak elasticity is formed, so that the second sliding piece 17 The pen is lightly held inside.

Here, as shown in FIG. 1, the second sliding piece 17 is formed to have the same diameter as the diameter of the second sliding piece or the whole thereof. Because of this A B C D is established so that it can be molded by extrusion molding.

Here, reference numeral 19 denotes a pen core, and the elastic core of the pen core 19 by the second sliding piece 17 is made of a constant friction force P ₁ , while the protrusion 15 has a tip cap 2. The inner peripheral wall of the) is elastically contacted with a constant frictional force (P ₂ ), the frictional force (P ₂ ) is set to be sufficiently larger than the frictional force (P ₁ ).

Next, the operation of the present invention will be described.

In the state in which the external force in the forward direction is not applied to the rear portion of the peel pipe 3, the cushion sleeve 8 is supported at the front end of the movable range, while the lead chuck is pushed in the retracting direction ( Since 4) retreats with respect to the chuck ring 7, the leading end of the lead chuck 4 remains in the state of biting the pen core 19. In this FIG. 1 state, when the lead pipe 3 is knocked away from the eraser rubber 6 side, the lead chuck 4 also moves forward together with the chuck ring 7 so that the chuck ring 7 moves out of the tip cap 2. When engaged with the step (2a), leaving the chuck ring (7), only the lead chuck (4) is to move forward to release the bite of the core (19). When the knock operation is released, the fill pipe 3 retracts with the lead chuck 4 so that the chuck ring 7 abuts against the front edge of the cushion sleeve 8, and at this position, the lead chuck 4 The retraction of the peel pipe 3 stops by tightening the tip to engage the peel core 19. By repeating this operation, the pen cores 19 are sequentially sent out. In this case, the length of the pen cores 19 which is sent out in one stroke operation is equal to the distance from the front end of the chuck ring 7 to the step portion 2a. Becomes the same.

In the process of advancing the pen core 19 by the pen tip sending operation, the friction resistance between the pen core 19 and the second sliding piece 17 is the friction resistance between the protrusion 15 and the inner circumferential surface of the tip cap 2. Since it is smaller than that, the pen lead 19 is moved forward from the lead guide portion 12 and the writing is performed like the normal lead chuck 4.

On the other hand, if the front end of the pen core 19 is worn out or broken during writing, pressing the pen core 19 remaining in the state of holding the outer cylinder 1 on writing paper, etc. Forces in the retraction direction act on the lead chuck 4 and the fill pipe 3 that are present, and these members bend the stopper 8c together with the chuck ring 7 and the cushion sleeve 8 by this force. They will retreat after defeating the force. The movement range in this retraction direction is set to about 0.5-1 mm as an example. By the way, since the said stopper 8c is engaged with the latching hole 1a of the outer cylinder 1, the retraction range area | region of these each member turns into G maximum dimension.

In addition, since the front end of the lead 19 is retracted to the tip position of the lead guide unit 12 in the retraction process of the lead core 19, the pressure pressed from the writing paper also acts on the lead guide unit 12. The lead guide portion 12 also retracts with the slider member 11. In the step where the lead 19 is moved to the rear end of the moving range, the positions of the lead 19 and the lead guide 12 are coincident with each other.

Subsequently, releasing the outer cylinder 1 toward the writing paper causes the body 8b of the cushion sleeve 8 to move forward to the front end of the movable range by the repulsive force when the stopper 8c is restored. Accordingly, the chuck ring 7 moves forward with the lead chuck 4 and the lead 19 held by the lead chuck 4 and returned to its original position.

However, since the lead guide portion 12 does not move forward due to the large frictional resistance between the protrusion 15 and the inner circumferential wall of the tip cap 2, the front end of the lead core 19 is the retraction of the lead guide portion 12. It protrudes from the front end of the lead guide portion 12 by a length corresponding to the distance. And this operation can be repeated until the lead guide portion 12 reaches the rear end of the movement range. When the lead guide portion 12 reaches the rear end of the movement range and needs to protrude the lead 19 again, the lead pipe 3 may be knocked to perform a normal lead delivery operation.

The lead chuck 4 is in contact with the rear end of the slider member 11 in the process of releasing the state where the lead chuck 19 is held and re-advanced according to this lead-feeding operation, and bringing the slider member 11 to the front end of the moving range. It will move forward. At this time, the lead core 19 also moves forward with the slider member 11 by the same moving distance, so that the front end 19 of the lead core 19 is kept in a state in which the front end of the lead guide unit 12 coincides with the front end of the lead core 12. Subsequently, when the knock operation is released, the lead chuck 4 leaves the nib 19 and the nib guide 12 in its position and stops at the position caught by the chuck ring 7.

If the knock operation in this state again to operate as described above will be able to advance the core (19) by a predetermined length.

As described above, the present invention mechanical pencil is a pen core (19) by pressing the front end of the pen core 19 only on writing paper, etc., without the knock operation when the lead guide portion 12 is in the retracted position. ) Can be projected by a predetermined length, and this operation is simplified by using a slider member made of one synthetic resin molded part without using a friction member such as a cylinder and rubber as in the prior art. It can also be simplified.

In addition, the slider member 11 can be manufactured inexpensively by mass production, and its size can be shortened, thereby contributing to shortening the overall length of the mechanical pencil. As a result, while the pen core 19 is consumed as much as the movable interval of the pen lead guide 12, the pen lead is not required by the knock operation, so that writing is continued without having to fix the outer cylinder of the mechanical pencil as in the prior art. I can do it. In addition, when excessive pressure is applied to the pen core 19 during writing, the pen core 19 elastically retracts due to the elasticity of the stopper 8c, thereby effectively preventing the pen core 19 from being broken. The effect can be obtained.

Claims (2)

The lead guide portion 12, which is inserted into the tip cap 2 of the outer cylinder 1 and is able to move in a predetermined range in the axial direction, is fixed to the rear end of the lead guide portion 12, The slider 19 supports the pen core 19 with a constant frictional resistance, and the outer peripheral surface portion thereof has a slider member 11 which is in contact with the inner peripheral surface of the tip cap 2 so as to slide with a frictional resistance greater than the frictional resistance. In the pencil delivery slider of a sharp pencil, the slider member 11 includes a second sliding member 17 for supporting a pencil core 19 slidably reciprocating in the pencil guide portion 12 with a constant frictional resistance; The first sliding piece 14 provided in the outer diameter direction of the second sliding piece 17 and brought into contact with the inner peripheral surface of the tip cap 2 with a frictional resistance greater than the frictional resistance so as to be slidable. Synthetic resin A pencil-delivering slider of a mechanical pencil, characterized by being formed in one piece with ash. 2. The slider according to claim 1, wherein the slider member (11) is formed integrally with the lead guide portion (12).