JPS5835880B2 - Slide pencil with built-in writing section - Google Patents

Description

Detailed Description of the Invention The present invention applies the mechanism for advancing and retracting the contents of a normal knock-type ballpoint pen to a mechanical pencil whose lead is fed out by a knock, thereby protecting the lead tip and tip pipe when not in use or when being carried. This invention relates to a mechanical pencil in which the tip pipe slides as the lead wears out during writing.

The present invention is based on the conventional two-stage knock type mechanical pencil (see Utility Model Publication No. 51-34329, Japanese Patent Publication No. 50-25846, Japanese Patent Publication No. 52-2328, Japanese Patent Publication No. 54-24824, Japanese Patent Publication No. 54-24325). By applying a tip pipe that can slide freely, there is no large knock when writing.F) The internal mechanism of the mechanical pencil is advanced to the forward position and fixed, and the tip pipe is extended to protect the lead. Then, write by retracting the tip pipe that protects the lead from consumption of the lead during writing.The next time the lead is fed out, a small knock is used to keep the internal mechanism fixed in the forward position and only the lead and tip pipe are fed out. When writing is finished, the internal mechanism is returned to the retracted position and fixed by a large knock again, and the tip of the lead is completely stored in the main body.

In the figure, reference numeral 1 denotes the main body of a mechanical pencil, which is made of metal, synthetic resin, or other material and formed into a pipe shape with a required diameter and length.The tip of the mouthpiece 1a is squeezed so that a tip pipe 2a, which will be described later, appears and retracts. Along with the eggplant, the rear end has a knock rod (
cap).

A core case 7 is inserted into the main body 1 so as to be freely forward and backward, and a core guide 6 is connected to the tip of the core case 7, and a core is held between the tips of the core guide 6. Screw the chuck 5 together.

Then, an annular pusher 10 having a chevron-shaped tip is integrally provided approximately in the center of the lead case 7, and a camp stopper ring 7a is provided near the rear end, and an eraser stopper M is provided from 7a to the rear end. The eraser R that is held and has the cleaner pin P is fitted, and further the cap C that serves as a knock rod when knocking the lead case I is fitted.

Lead case I extends around the outer periphery of the above three-split chuck and lead guide.
A bullet s2 is interposed between the joint 3 and the joint 3, which will be described later, and the core is held between the chuck and the tightening tool, which will be described later.

A pipe-shaped joint 3 is fitted to the outer periphery of the lead case 7, the lead guide 6, and the three-piece chuck 5, and a rotary plate 9 is provided to be located between the joint 3 and the pusher 10.
By knocking, the rotary plate 9 is moved via the pusher 10 to the chevron-shaped inclined surface at the tip of the pusher, the inclined surface of the uneven portion 1b carved on the inner wall of the main body 1, and the groove provided on the outer periphery of the rotary plate 9. When the foot engages with the inclined surface, it rotates by the required angle, thereby fixing the entire contents of the chuck, lead case, etc. in the forward or backward position within the main body.

The internal cap 2 is screwed onto the tip of the joint 3, and a flap 3a is provided at the rear end, and the surface where the flap 3a contacts the rotary plate 9 is made, for example, as shown in the figure, to ensure smooth rotation of the rotary plate 90. Spherical and eggplant.

Further, a bullet S1 is interposed between the spring retaining ring 8 provided on the inner surface of the front portion of the main body 1, so that the joint 3 always pushes the rotary plate 9 in the direction of the cap C.

When the internal mechanism is in the forward position, the force of the bullet S1 for storing the contents must be greater than the force of the bullet S2 for the core clamping action.

In other words, when knocking, Sl does not contract, S2 contracts first,
If you knock further, the number 81 will be shortened.

Further, a fastening tool 4 is loosely fitted into the inner surface of the tip of the joint 3, and the core is held or released by this fastening tool 4 and the three-split chuck 5.

Furthermore, a tip pipe 2a equipped with an elastic core holder 2b made of rubber, synthetic resin, etc. is slidably fitted inside the tip of the internal cap 2, and the core is held by this tip pipe. be.

Further, a stepped portion 2c is provided on the inner surface of the internal mouthpiece 2, and after the tightening tool 4 and three-split chuck 5 move forward together with the lead chucked by the knock, the tightening tool 4 hits this stepped portion 2c and comes off, leaving the three-split chuck. Only 5 moves forward, so the chuck is released.

In this case, the length of the lead to be drawn out is determined by the distance from which the front end of the tightening tool 4 hits the stepped portion 2c, and by regulating this distance, the length of the lead to be drawn out by one knock can be arbitrarily determined. can do.

When you want to write with a mechanical pencil having the above-mentioned configuration while facing the camera, first knock the cap C until the outer step C2 of the cap reaches the rear end of the main body 1 (big knock).
Then, in the state shown in Figure 2, since the bullet S1 is fully extended, sl first contracts a little, and when the force of Sl becomes stronger than 82, 82 contracts, and then there is a knock, so 81 also contracts. , Sl is rotated via a pusher to fix the contents in the advanced position when the final retraction occurs.

When the knock is released, the rotary plate moves back a little due to the action of the bullet S1 and is fixed in the forward position, and the core is chucked by the action of 82, as shown in FIG.

Next, when the lead protected by the tip pipe is consumed by writing, the tip pipe also retreats as the lead wears out, and when it has retreated to the rearmost part, knock the cap C until the step C1 reaches the rear end of the main body 1 (a small knock). ), the push tool 10 becomes the rotating plate 9.
Since the joint 3 and the internal cap 2 remain in the same position, the force of the bullet S1 is stronger than the force of S2 when the internal mechanism is in the forward position, so only S2 contracts, that is, the core and this core are Only the protected tip pipe is extended.

(When the tip pipe is at its most advanced position, only the core is fed out from the tip of the tip pipe.

) Next, when the knock is released, the lead is chucked by the action of the bullet S2 and becomes as shown in Fig. 1, so that it is possible to write with the drawn out lead.

In this way, only the core and tip pipe can be fed out by a small knock while the contents are maintained in the forward position.

Next, when you finish writing, if you knock hard again, the core and tip pipe will be paid out and the contents will move forward, and this time the rotary plate will rotate so that it can return to the retracted position, so when you release the knock, the bullet S1 The contents retreat into the main body due to the action of
As shown in the diagram.

That is, the contents are completely contained within the main body.

Even if a small knock is made in this state, Sl will shrink, and the lead will not be drawn out.

In addition, when the contents are stored, the core case 7 is closed as shown in Figure 3.
If the force of the bullet S1 is made stronger than the force of the bullet S2, the chuck 5 will not clamp the core L.

Even if you knock in this state, the wick will not come out.

According to the present invention, writing can be started by first feeding out the lead and tip pipe with a large knock, and then advancing and fixing the contents in the forward position. During writing, the tip pipe automatically moves as the lead wears out due to writing pressure. Since the lead moves backward, it is possible to write continuously without breaking the lead and without having to draw out the lead by frequent knocks.In addition, when the lead is not worn out during writing, the lead is moved back to the forward position by a small knock. You can feed out only the lead and tip pipe as many times as you like, and when you are done writing, you can use a large knock to feed out the lead again and return the contents to the retracted position, allowing them to be completely stored inside the main body. In this state, the lead will not be drawn out even by a small knock.

In addition, the entire contents are stored inside the main body by the dog knock, and at this time, the wick will not be drawn out by a small knock, so there is no chance of breaking the wick or tip pipe when not in use or when carrying it around. It has excellent advantages such as the tip will not stain or tear clothes, and when writing, the lead can be easily extended by a small knock similar to a regular knock-type mechanical pencil while keeping the content in the forward position. This invention has the following features.

Furthermore, since the lead clamping bullet was installed between the joint and the lead case, the entire contents were completed as a single structural unit with the lead clamping bullet sealed inside. ,
The work of assembling the contents into the main body becomes easy, and if a defective product occurs, it can be made into a good product by replacing only the contents or only the main body, which has the advantage of increasing production efficiency.

[Brief explanation of drawings]

The drawing shows a mechanical pencil according to the invention. FIG. 1 is a cross-sectional view showing the beginning of writing, FIG. 2 is a cross-sectional view showing the contents stored state, and FIG. 3 is a cross-sectional view of a different embodiment showing the contents stored state. 1.-- Mechanical pencil body, 1a...
・Cap part, 1b... Uneven part, 2... Internal cap, 2a... Tip pipe, 2b...
・Core holder, 2c...Stepped portion, 3...Joint, 3a...Brim, 4...Tightening tool, 5
...Three-split chuck, 6... Lead guide, 7... Lead case, 7a... Cap retaining ring, 8... Spring Retaining ring, 9
... Rotating plate 10 ... Pressing tool, C ...
... Cap, C1 ... Stepped part, C2 ...
...Cap outer step, L...core, M...
... Eraser stopper, P ... Cleaner pin, R ... Eraser, Sl, S2 ... Bullet machine.

Claims (1)

[Claims] 1 Inside the main body 1, a lead case I that accommodates the lead, a chuck 5 connected to the front end of this lead case 7, a fastener 4 that fits into this chuck 5, a joint 3 that supports this fastener 4, and this joint A rotary plate 9 for receiving the rear end of the joint 3 between the main body 1 and the joint 3, and a pusher provided on the outer periphery of the core case 7. 10 and a mechanical pencil equipped with an advance/retreat mechanism consisting of a concavo-convex portion 1b carved on the inner surface of the main body 1, a tip pipe 2a equipped with a lead holder 2b made of an elastic body is slidably attached to the tip of the internal mouthpiece 2. Fit and insert, main body 1 and fitting 3
Between the joint 3 and the core case 7, there is provided a bullet S1 for incorporating the content that urges the joint 3 in the backward direction, and a bullet S2 for holding the core is provided between the joint 3 and the lead case 7, so that the content is in the forward position. The force of the bullet S1 for storing the contents is set to be stronger than the force of the bullet S2 for holding the core, and a large knock of the core case 7 causes the contents to be moved to the forward position in the main body 1 or lJ of the core case 7 when it is locked in the backward position and the contents are in the forward position
A sliding mechanical pencil with a built-in writing section that is characterized by a mechanism that moves the lead forward by pushing.