JPH09277780A - Mechanical pencil challenging no residual refill and no residual eraser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent loss of residual refill and breakage of refill and shorten a writing time. SOLUTION: A refill clamping tool 2, a block type chuck 1 and the like are provided nearby so that the tip of a refill A can be seen clearly at the time of writing characters or the like. The tip can be pushed freely, and a soft touch eraser is provided, and a magnetic thermal expanding body is provided so that an eraser cap and the refill can be operated smoothly and the whole length of the mechanical pencil is reduced.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing mechanical pencil.

[Prior Art] In a conventional mechanical pencil, there is a lot of residual core loss, and an eraser accounts for about 20% of the total length.
Was a loss.

[Problems to be Solved by the Invention] In the conventional mechanical pencil, it is necessary to take measures against the following problems. 1) About 13% of the waste of reclaimed cores was lost, and it took a few seconds for the new core to be taken out, and it was necessary to tackle zero residual cores. 2) The small-diameter eraser has a large wear size, the waste of opening the residual rubber reaches about 25%, and the protrusion amount is adjusted frequently, and a time loss of 15 seconds occurs each time, and a simple appropriate amount of protrusion and replacement is required. Measures were needed. 3) There is a large gap between the wick and the wick cap, the wick is rattling and writing is difficult, and the wick is easily broken. 4) The long mechanical pencil had a length of 14 cm, which wasted to make large containers such as pockets.

[Means for Solving the Problems] In order to achieve the above object, in the mechanical pencil of the present invention, only the both ends are changed without changing the structure other than the core-side lower end and the eraser-side upper end. On the lower end core side, place a collet chuck that holds the core at a position about 0,5 mm from the end of the core,
A core stopper is provided close to the inside or inside, but it is also possible to use not only rubber or resin but also a rubber magnet, a plastic magnet, etc. for the bush, and to inject a magnetic paste that improves fixing, stopping and feeding slips. Take steps that can be done. Also, on the upper eraser side, a thick rubber is used for mounting a hole diameter, and a square pin protruding into the rubber is used to easily prevent rotation, and the outer peripheral cap of the eraser is a pipe made of a material with a high coefficient of thermal expansion such as Teflon. With a general Neji pipe, etc., the amount of protrusion can be adjusted easily, and further, rubber is pushed to make it simple without a ceiling and an eraser cover.

[Operation] Since there is a core stopper and a chuck at a position of about 0,5 mm from the end of the core, it functions to prevent the loss of the core, and the magnetic paste smoothes the delivery and prevents the core from breaking. It also works. The eraser is easy to insert and remove, and can be exchanged for a short time. If you use a Teflon pipe cap, you can warm it up with your fingers and immediately move it to the cradle. It is preferable to use rubber up to the outer periphery of the pin.

[Embodiment] An embodiment will be described with reference to the drawings. When pushed from the eraser side, the top collet chuck of Fig. 1 opens, and the core is sent out, but when the push is released, the spring inserted in the middle is operated, and the top collet chuck (1) is The core is fixed by making contact with the inner wall of (4), but the core stopper (2) is made of rubber or the like having a force for grasping the core, and is fitted by using the elastic force. Fig. 2 shows a core stopper that is not a ring, but is inserted between three equally spaced slots in a top-type chuck, and has a Y-shaped foot with magnetic paste injected into the inner diameter. The ingredient (2) is
Made from permanent magnets such as plastic magnets and rubber magnets to stabilize the force of gripping the core and improve extrusion slippage. FIG.
FIG. 3 is a view of the core stopper viewed from the core side of FIG. 2. Fig. 4 shows the upper eraser part. When the triangular pin (5) is inserted into the core lid (6) and the rubber is detoured, when the rubber becomes short, the rubber cap is on the left side of the figure. Even if the whole rubber (B) was exposed to the outside, it was erased at the outer periphery of the pin and was structured so as not to come off. The centering part (8) and the rubber cap are moved by a knuckle type. FIG. 5 shows a core stopper (2) in which a ring-shaped rubber magnet and a magnetic paste are incorporated, and three stopper pins (1
0) is fixed to the core stop ring. Further, a resilient rubber cover (11) is covered on the outer circumference of the top-type chuck, and when pushed, it is expanded and the core is exposed.
FIG. 6 shows an example of a book meat pipe made of a material having a high coefficient of thermal expansion, such as Teflon, instead of fixing the rubber cap (7).
When warmed by the body temperature of the hand, it spreads out and the fixation becomes easy and easy to move, so the amount of protrusion of the eraser can be easily adjusted. The core lid (6) has one pin type. In addition to Teflon, a thermal memory alloy pipe is also suitable.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following advantages. 1) The remaining core waste can be reduced to 1%, and the next core is approaching. 2) You can change the eraser with 3φ outer diameter to 6φ, wear length is a little, and you can easily replace it in a short time and adjust the amount of protrusion, so there is no rubber breakage and you do not have to erase with your fingers.
Reclaimed rubber could be reduced to 3%. 3) Since the dimension from the tip of the core to the rattle-free top chuck is short and the fixing is secure, core breakage is reduced. 4) Pushing of the push core is smooth when using magnetic force. 5) The total length of the mechanical pencil can be shortened by about 20 mm and the storage case can be made smaller. 6) Adjustment of the amount of protrusion of rubber is greatly shortened to 1/3 in 15 seconds, and the temperature memory alloy is convenient.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of the present invention of a tip of a pencil lead.

FIG. 2 is a half cross-sectional view showing an embodiment of the tip of a mechanical pencil different from that of FIG. 1 of the present invention.

FIG. 3 is a front view seen from the tip on the core side in FIG.

FIG. 4 is a cross-sectional view showing an embodiment of the present invention of a pencil eraser.

FIG. 5 is a sectional view showing an embodiment of the present invention at the tip of a pencil lead.

FIG. 6 is a cross-sectional view showing an embodiment in which a thermal expansion ring depending on temperature is used in a pencil eraser portion.

FIG. 7 is a cross-sectional view showing the inside of the core of the mechanical pencil of the present invention.

[Explanation of symbols]

A core B eraser C magnetic paste 1 piece type chuck 2 core fixing tool 3 color 4 core cap 5 pins 6 core lid 7 rubber cap 8 core case 9 body 10 locking pin 11 rubber cover 12 back collet chuck

Claims (2)

[Claims] 1. From the lower end of the core, at a position of about 0,5 mm,
Permanent magnet that uses magnetic force such as magnetic paste, general rubber, resin core and fasteners built-in or close to each other. ,mechanical pencil. 2. A rubber-side cap that can be moved in a short time is used to adjust the amount of protrusion of the eraser, using a material that expands at body temperature, etc., on the outer periphery of the eraser receiver, which is provided with a reciprocating polygonal turning pin in the center. , A mechanical pencil that can be used with eraser until the end and is convenient for replacement.