JPH0318220Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a writing instrument characterized in that the barrel portion thereof is equipped with a balance adjustment function that guarantees an optimal writing taste for each individual.

BACKGROUND TECHNOLOGY In conventional writing instruments, the length of the cylindrical portion is fixed constant.

Problems that the invention attempts to solve: For this reason, it is easy to write the shaft cylinder part and it is not tiring.
I couldn't adjust the length to suit me.

In other words, the elements that a writing instrument should have include good writing feel, balance, and design, but among these, traditional writing instruments have problems with balance (i.e., they can be tiring even after long periods of writing). The problem of good balance) remained unresolved.

In other words, differences in balance due to individual differences were easily processed using average values, and a so-called ergonomic solution was attempted.

This invention focuses on this point and solves this difference in balance due to individual differences by installing a mechanism that can arbitrarily extend, contract, and fix the barrel length of the writing instrument, making it possible to adjust the balance optimally for each individual. We provide new writing utensils that will make your life easier.

Means for solving the problem Therefore, the present invention has been developed to
A bellows with two sides of different lengths and the shapes of the ridges aligned in the same direction is formed to form a telescopic, bendable and fixable bellows, and at the tip of the barrel of the writing instrument,
A writing instrument with a balance adjustment function was created by attaching the tip of the core material with a protruding length that roughly corresponds to the length of the barrel when it is contracted.

Effect By adopting such a method, the entire length of the bellows shaft can be extended or contracted at will by applying force in the longitudinal direction, so the length can be adjusted to the length determined to be optimal for the user. If you stop adjusting the extension and contraction at that length, it will be fixed at that length and the balance adjustment will be completed.

Incidentally, since the above action occurs whenever force is applied in the longitudinal direction, fine adjustments can be made even during writing.

Embodiment Next, an embodiment of the present invention will be described based on the drawings, but the present invention is not particularly limited to this embodiment.

Now, Figure 1 is a side view of the first embodiment of the present invention, Figure 2 a is a partial sectional view of an ordinary bellows, and b
c represents a partial cross-sectional view of the bellows used in the present invention in an expanded state, and c represents a partial cross-sectional view of the same in a contracted state.

The first embodiment is a telescopic, bendable and fixable pen, in which the lengths of the two sides 4 and 4' of each bellows ridge 3 are different in the longitudinal direction of the barrel of the ballpoint pen 1, and the shapes of the ridges 3 are aligned in the same direction. A bellows 2 is formed, and a tip end portion of a ballpoint pen core 5 having a length roughly corresponding to the length of the barrel when contracted is projected and built into the tip cap 6 of the ballpoint pen 1. In addition, 7 is the tail crown.

In an ordinary bellows 2', as shown in Fig. 2a, the right and left sides 4 of the crest 3' are arranged in a line with equal lengths, but the bellows 2 used in the present invention is particularly As mentioned above and shown in Fig. 2b, the lengths of the sides 4 and 4' of the ridges 3 of the bellows are different, but the shapes of the ridges 3 are formed in a line in the longitudinal direction of the bellows. For this purpose, a bellows 2 is provided which can be expanded and contracted and fixed.

If a force is applied in the direction of reduction, the short side 4' retracts so as to fit under the long side 4, and the overall length is reduced and fixed as shown in FIG. 2c.

When using the ballpoint pen of this embodiment, the shaft portion of the bellows 2 may be adjusted to extend or contract to a length that provides the best grip balance according to the user's preference, and then fixed.

It is also important to finely adjust the length depending on the condition of the arm, such as fatigue during writing.

In this way, each individual has acquired the optimal balance adjustment function, but the continuous adjustment function using the bellows can be achieved by counting the approximate number of expansion or contraction nodes (number of peaks) at the time of optimal balance. It has the advantage of being able to immediately return to the optimal balanced state even after the shaft cylinder length is changed involuntarily or intentionally.

By the way, the degeneration of the barrel portion of this ballpoint pen 1 is as follows.
In addition to Y, which is performed over the entire circumference in the cross section of the bellows 2, it is also possible to retract only a partial circumference. Since the ballpoint pen can be left bent on the side X, it is possible to write while the ballpoint pen is bent, and it also prevents it from rolling, making it extremely unique in terms of functionality and design. It can be said to be a ballpoint pen.

In addition, the direction in which the shapes of the peaks 3 are aligned (folds 9 at the time of reduction)
The direction in which the bellows 2 faces does not need to be the same over the entire length of the bellows 2, and the direction can be changed midway.

Next, FIG. 3d shows a side view of the second embodiment, e shows a front view thereof, and f shows a front view of the third embodiment.

This example is an example of the simplest configuration,
The core 5' is fixed by crushing and welding the tip of the bellows 2 to form a welded part 8, without using the tip cap 6 of the first embodiment. Note that a similar welded portion 8 was formed at the other end of the bellows 2 instead of being covered with a tail crown.

This embodiment is also used in the same manner as the first embodiment, and has the same effects.

In addition, various embodiments of the present invention can be devised; for example, as the core material, pencils, chiyoke,
Some types of sharpener pens, fountain pens, felt-tip pens, etc. can be used, and their core length should preferably be relatively short in order to reduce the main barrel, and should be about the shortest length of the bellows.

Further, as the core material, a felt pen with a grip handle or a ballpoint pen itself can be used, but as an example, as shown in FIG. An insertion port 12 for a writing instrument is opened, and an inner cylinder 13 for holding the inserted writing instrument is raised from the insertion port 12 toward the inside of the main barrel (fifth embodiment).

To use this, from the insertion port 12 to the inner cylinder 13
For example, you can insert a pencil inside. Then, it can be freely expanded, contracted, bent and fixed.

This embodiment also has the same effects as described above, and is an interesting writing instrument.

As the material of the bellows, polypropylene, which is a resin with particularly little bending fatigue, can be used, and it can be easily manufactured at low cost by blow molding or the like.

Now, the effect of optimal balance adjustment can be achieved by providing a writing instrument cap with a bellows structure similar to the above. If this cap is used, the balance of a general writing instrument can be adjusted by capping the tail of the writing instrument and changing the length of the cap as appropriate. Of course, it is also interesting to use it in combination with a bellows shaft cylinder.

Furthermore, the bellows used in the present invention can also be configured as a cap press writing instrument, and as shown in the state explanatory diagram of the ballpoint pen illustrated in the fourth embodiment in FIG. By hiding the lead 5 and conversely reducing it, the tip of the lead 5 can be held in a writable state.

Of course, it would be interesting to add the above-mentioned balance function in addition to this special function.

Effects of the invention As described above, in this invention, in the longitudinal direction of the barrel of the writing instrument,
A bellows with two sides of different lengths and the shapes of the ridges aligned in the same direction is formed to form a telescopic, bendable and fixable bellows, and at the tip of the barrel of the writing instrument,
The tip of the core material, whose length roughly corresponds to the length of the barrel when it is contracted, is attached so that it protrudes, creating a writing instrument with a balance adjustment function. Stretch arbitrarily,
Since it is possible to reduce the length, if you stop adjusting the expansion and contraction at the length that you judge is best for you, the overall length will be fixed at that length and the balance adjustment will be completed, and there will be no force in the longitudinal direction. By adding this, you can now make fine adjustments at any time, so we solved the difference in balance due to individual differences by installing a mechanism that can extend, contract, and fix the barrel length of the writing instrument, making it ideal for each individual. We were able to provide a brand new writing instrument that allows for balance adjustment.

In addition, as an additional effect, by counting the approximate number of expansion or contraction nodes (number of peaks) at the time of optimal balance, even after the shaft cylinder length is changed involuntarily or intentionally, The optimal balance can be returned immediately, and the bending and fixing prevents the writing instrument from rolling, eliminating the risk of damaging the tip of the lead.The bellows crest prevents the fingertip from slipping, and the bellows structure provides resistance to writing pressure. The writing instrument is strong and does not collapse easily, so it can be made of thin material and lightweight, the writing instrument makes a light popping sound when expanded and contracted, and the barrel length can be extremely long or short, which improves functionality and surprises. It can emphasize the fun and uniqueness of the design.

[Brief explanation of the drawing]

FIG. 1 is a side view of a first embodiment of the present invention.
FIG. 2a is a partial cross-sectional view of a normal bellows, and FIG. 2b is a partial cross-sectional view of the bellows used in the present invention in an extended state.
c is a partial cross-sectional view of the same reduced state. FIG. 3d is a side view of the second embodiment, e is a front view thereof, and f is a front view of the third embodiment. FIG. 4 is a state explanatory diagram of the fourth embodiment. FIG. 5 is a side view of the fifth embodiment. 1... Ballpoint pen, 2... Telescopic, bendable and fixable bellows, 3, 3'... Mountain, 4, 4'... Mountain side, 5... Ballpoint pen core, 5'... Writing instrument core, 6
... Tip cap, 7 ... Tail crown, 8 ... Welded part,
9...Folds when reduced, 11...A thickly molded barrel, 12...Writing instrument insertion opening, 13...Inner cylinder.

Claims (1)

[Scope of utility model registration request] A bellows is formed in the longitudinal direction of the barrel of the writing instrument so that the lengths of the two sides of each bellows peak are different, and the shapes of the peaks are aligned in the same direction, and are expandable, bendable, and fixable.
1. A writing instrument having a balance adjustment function, characterized in that a tip of a core material having a length roughly corresponding to the length of the barrel when contracted is attached to the tip of the barrel of the writing instrument in a protruding manner.