JPS5928877Y2 - Notsuku style pencil - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a knock-type mechanical pencil, and particularly to a structure for adjusting the protruding length of its tip pipe.

Conventionally, knock-type mechanical pencils have been provided in which the lead is positioned on the prong of the tip pipe in order to prevent breakage of the lead, and the tip pin and the slider to which it is attached are moved back in response to the friction of the lead while writing. There is.

However, with such mechanical pencils, the lead cannot be seen when writing, making it difficult to write with a feeling of anxiety, and the tip pipe cannot be stopped at the desired protrusion length, so when drawing a line along a ruler, the tip The lifting platform, which did not allow the pipe to be placed in place and had to be drawn by placing the nozzle on a ruler, had drawbacks such as the inability to accurately draw lines in the shape of the ruler.

In addition, with a retractable mechanical pencil whose tip pipe is fixed by protruding from the base, is it possible to eliminate the anxiety of not being able to see the lead when writing? There was a drawback that the protruding length of the pipe could not be adjusted.

Therefore, as shown in Japanese Utility Model Publication No. 5L-27855, a slider equipped with a tip pipe and a core holder is slidably fitted inside the cap so that the tip pipe can protrude from the hole at the tip of the cap. A mechanical pencil has been proposed in which a tightening body having a center hole is tightly inserted into the tip of the inner surface of the mouthpiece, and the protruding length of the tip pipe can be adjusted by frictional resistance between the tip pipe and the tightening body.

However, the engagement force between the tightening body and the slider is determined by the frictional force between the small-diameter tip pipe and the center hole of the tightening body, and a stable holding force for the slider cannot be obtained.

In addition, there is no means for fixing the tightening body to the tip of the inner surface of the cap, and the diameter of the inner surface of the cap behind it gradually increases. , the slider, tip pipe, etc. may fall from the base and be lost.

The purpose of this invention is to stop the tip pipe at an arbitrary protruding position with respect to the base, make the lead protrude from the tip pipe to a desired length, make the lead visible when writing, and make it easier to write. By protruding and stopping in accordance with the thickness of the pipe, and applying only the outer periphery of the tip pipe to the ruler so that the base does not touch the ruler, it is possible to accurately and easily draw a line in the shape of the ruler. Furthermore, the slider, tip pipe, etc. can be prevented from falling and being lost even if the cap is removed, and furthermore, the slider equipped with the tip pipe and holding chuck can be easily assembled into the cap. It is an object of the present invention to provide a knock-type mechanical pencil characterized in that it is configured so that the compatibility of sliders and the like and the efficiency of assembly work can be improved.

In order to achieve the above object, the present invention has a tip pipe and a lead holder inside the mouthpiece, a slider is fitted so that the slider can be moved forward and backward, and a fastener is fitted when the knocking mechanism is activated. A groove formed on the outer periphery of the middle part of the slider for a knock-type mechanical pencil in which the chuck is advanced and the slider is advanced by the advancement of the chuck for holding the lead, causing the tip pipe to protrude from the hole at the tip of the mouthpiece. An O-ring made of a soft elastic material is fitted into the holder, and the O-ring is brought into pressure contact with the sliding guide part of the slider that is attached to the base, and the frictional force between these 01J rings and the sliding guide part is applied to the core of the core holder. The inner diameter of the sleeve is configured such that the friction force is larger than the frictional force of the sliding guide, and the inner diameter of the sleeve is configured to be larger than the frictional force of the sliding guide. It is characterized by being configured to be smaller than the outer diameter of the slider and larger than the outer diameter of the slider.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

1 is a shaft cylinder, 2 is a cylindrical shaft joint provided at the tip of the shaft cylinder 1 and has a screw on the outer periphery, 3 is a core case, 4 is a relay pipe connected to the tip of the core case 3, and 5 is a relay pipe A lead gripping chuck is connected to the tip of the lead gripping chuck 5, and the two side chuck portions of the tip are projected forward from the joint 2; 6 is a fastener fitted to the outer periphery of the tip of the lead gripping chuck 5; 7 is the A spring interposed between the shaft coupling 2 and the core case 3. The spring 7 urges the core case 3, the relay pipe 4, the core gripping chuck 5, and the fastener 6 backward, and the shaft coupling 2 causes them to move backward. The tip chuck portion of the lead gripping chuck 5 is pulled into the inside of the fastener 6 where the lead gripping chuck 5 is regulated and closed.

By operating the knock mechanism, the lead case 3, relay pipe 4, lead gripping chuck 5, etc. can be moved forward against the elasticity of the spring 7.

Reference numeral 8 denotes a cap whose threaded portion on the inner periphery of the base is screwed onto the shaft joint 2. Numeral 9 denotes a slider fitted into the sliding guide portion 10 inside the cap 8 so as to be able to move forward and backward. Equipped with a tip pipe 11 that can protrude from the hole at the tip, and a core holder 1 inside.
It is equipped with 2.

This slider 9 is pressed and moved forward by the advance of the lead gripping chuck 5 in conjunction with the operation of the knocking mechanism as described above.

13 is the core.

A 0' J-song fitting groove 19 is formed on the outer periphery of the intermediate portion of the slider 9, and an O-ring 20 made of a soft elastic material whose outer diameter is larger than the inner diameter of the sliding guide part 10 is in a compressed state. This 01J ring 20 is fitted into the sliding guide part 1.
It is pressed to 0.

The frictional force between the O-ring 20 and the sliding guide portion 10 is set to be larger than the frictional force between the core 13 and the core holder 12.

On the rear side of the sliding guide part 10 of the slider 9 provided in the cap 8, the fastener 6 has a diameter larger than that of the sliding guide part 10 of the slider 9.
A sleeve fitting portion 15 having a smaller diameter than the sliding guide portion 14 is formed with step portions 16 and 17, respectively.

A sleeve 18 for restricting O-ring retreat is inserted into this sleeve fitting portion 15, and its tip and base large diameter portion 18a abut against stepped portions 16 and 17, respectively.

This sleeve 18 has an inner diameter smaller than that of the sliding guide part 10,
Moreover, it is formed to have a larger diameter than the outer diameter of the slider 9, and when the lead gripping chuck 5 moves forward, the forward movement of the fastener 6 is restricted to a predetermined stroke, thereby determining the amount of delivery of the lead 13.

To assemble the slider 9 and sleeve 18 inside the base 8, first insert the sleeve 18 into the sleeve fitting portion 15.

After that, the slider 9 equipped with the tip pipe 11 and the core holder 12 and fitted with the O-ring 20 in the groove 19 is inserted from inside the sleeve 18, and the O-ring 20 of the slider 9 is inserted.
is compressed and fitted into the sliding guide part 10.

Therefore, even if the cap 8 is removed, the O-ring 2 of the slider 9
0 is prevented from coming off from the sleeve 18, and there is no possibility that it will easily come off from the inside of the cap 8.

To remove the slider 9, press it with a pin of approximately the same shape from the end pipe 11 side of the base 8, further compress the compressed 01J ring 20 of the slider 9, and allow it to pass through the sleeve 18.

At this time, the slider 9 can be easily attached and detached by reducing the dimensional difference between the inner diameter of the sleeve 18 and the sliding guide portion 10.

Since the present invention has the above-described configuration, when in use, the knocking mechanism is activated and the lead gripping chuck 5 is advanced to move the slider 9 between the O-ring 20 and the sliding guide portion 10.
The tip pipe 11 is pushed forward against the frictional force of , and the tip pipe 11 is made to protrude from the base 8.

At this time, by pressing the tip pipe 11 onto a desk or the like, the slider 9 is moved back against the frictional force between the O-ring 20 and the sliding guide part 10, and the tip pipe 11 is adjusted to a desired protruding length and maintained in that state. can be stopped.

Thereafter, by pressing the knock mechanism, the lead 13 can be made to protrude from the tip pipe 11 by a desired length, and writing can be performed.

At this time, the amount by which the lead 13 is fed out by one knock is the distance between the tip of the fastener 6 and the rear end of the sleeve 18, which is longer than the forward distance of the lead gripping chuck 5, and the slider 9 is Since it is held by the frictional force of the O-ring 20, by lightly pressing the knock mechanism, only the 11 cores 13 can be delivered with the tip pipe 11 and slider 9 stopped at the desired positions.

After use, press the knock mechanism to release the lead 13 from the gripping state by the lead gripping chuck 5, and hold the lead 13 in that state.
3 and the tip pipe 11 on a desk or the like, the core 13 and the tip pipe 11 can be stored inside the cap 8.

As is clear from the above description, according to the present invention, an O-ring made of a soft elastic material is fitted into a groove formed on the outer periphery of the intermediate portion of the slider having the tip pipe 11 and the core holder 12. The O-ring is in pressure contact with the sliding guide portion of the slider in the cap, and the friction force between the O-ring and the sliding guide portion is larger than the friction force against the core of the lead holder.

Therefore, the tip pipe can be adjusted to a desired protrusion length with respect to the mouthpiece and then stopped, and with the tip pipe stopped, the lead can be made to protrude by the desired length, making it possible to see the lead when writing. , it becomes easier to write because the feeling of anxiety disappears.

Further, by projecting the tip pipe according to the thickness of the ruler and stopping it, only the outer circumference of the tip pipe can be brought into contact with the ruler, and a line along the ruler can be accurately and easily drawn.

In addition, compared to conventional mechanical pencils of this type such as those disclosed in the above-mentioned Japanese Utility Model Publication No. 51-27855, the 01J ring is provided in the middle part of the slider with a large diameter, so the contact area with the base is large and the frictional force is reduced. Easy adjustment and extremely stable slider holding force can be obtained.

In addition, a sleeve for restricting the O-ring from retreating is provided inside the cap facing toward the rear side of the sliding guide, and the sleeve is configured such that the inner diameter of the sleeve is smaller than the diameter of the sliding guide and larger than the outer diameter of the slider. are doing.

Therefore, since the slider's outer periphery 01J is in contact with the sleeve and the slider is restricted from retreating, it is possible to prevent the slider and the like from falling and being lost even if the cap is removed.

Furthermore, after press-fitting the sleeve into the inside of the mouthpiece, the slider, which is equipped with a tip pipe and a holding chuck, can be attached and detached by relatively forcefully pressing the sleeve, which provides excellent compatibility with sliders and improves assembly work efficiency. There are advantages such as

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the knock-type mechanical pencil of the present invention. 1... Shaft cylinder, 2... Shaft coupling, 3... Core case, 5
... Lead gripping chuck, 6... Fastener, 8... Mouthpiece, 9... Slider, 11... Tip pipe, 12
... Core holder, 13... Core, 18... Sleeve,
20...O-ring.

Claims (1)

[Scope of utility model registration request] A lead gripping chuck in which a slider equipped with a tip pipe and a lead holder is fitted to the inside of the mouthpiece so as to be able to move forward and backward, and a lead gripping chuck fitted with a fastener is moved forward as the knock mechanism operates. The slider moves forward when the slider moves forward, causing the tip/ζ-ib to protrude from the hole at the tip of the tip of the knock-type mechanical pencil. When fitted, the O-ring is brought into pressure contact with the sliding guide part of the slider in the base, and the frictional force of these 0' J song sliding guide parts is configured to be larger than the frictional force against the core of the core holder. and a sleeve for restricting OIJing retreat is provided inside the cap facing toward the rear side of the sliding guide, and the inner diameter of this sleeve is smaller than the diameter of the sliding guide and larger than the outer diameter of the slider. A knock-type mechanical pencil characterized by being configured as follows.