JPS5855034Y2 - Ballpoint pen for teaching - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ballpoint pen for teaching that has a built-in multi-stage telescopic tube that can be extended as a pointing stick.

This type of ballpoint pen is used as a normal ballpoint pen when the telescopic tube is contracted, and when the telescopic tube is extended, it is used as a pointing stick, so it is recognized as a very convenient tool for teaching purposes.

However, conventional ballpoint pens have drawbacks such as relatively complex structures and the need for very troublesome operations when replacing ballpoint pen refills.

The present invention basically eliminates the above-mentioned drawbacks by configuring a knock-type ballpoint pen unit that functions as a ballpoint pen by itself, separate from the pen hollow part that houses the retractable tube.

The knock-type ballpoint pen unit has a holding tube at the tip into which a ballpoint pen refill is inserted, and a cap with a knock button that has a built-in conventional knock mechanism.It is inserted from the rear end into the pen's hollow shaft, and the cap is inserted into the pen's hollow shaft. It is attached to the hollow shaft by screwing.

Thus, the ballpoint pen refill can be easily replaced by removing the entire knock-type ballpoint pen unit from the pen hollow shaft and pulling it out.

Referring now to the drawings, Fig. 1 is an exploded perspective view of a ballpoint pen for teaching according to the present invention, and Fig. 2 is a cross-sectional view thereof, where 1 is a hollow shaft of the pen, and 2 is a pen built into the hollow shaft of the pen. , multi-stage telescopic tube that can be extended from the tip, 3
is a core guide holding portion fixed to the tip of the innermost expandable tube among the expandable tubes.

The knock-type ballpoint pen unit 4 includes a cap 5 that incorporates a conventional knock mechanism (not shown), and the cap has a knock button 6 that projects rearward thereof, and is moved forward as is well known by operating the knock mechanism. Retractable holding tube 7
is held.

A ballpoint pen refill 8 is inserted into the tip of the holding tube 7.

The ballpoint pen unit is inserted into the hollow pen shaft 1 from the rear end, and is screwed into the hollow pen shaft by the internal thread 9 provided on the inner surface of the rear end of the hollow pen shaft and the external thread 10 of the cap 5. Fixed.

It is preferable to interpose a decorative washer 11 between the cap 5 and the rear end of the hollow pen shaft 1.

Since the present invention is configured as described above, by pressing the sock button 6 while the telescopic tube 2 is contracted, the ballpoint pen refill 8 will protrude through the lead guide holding part 3, and the knock button 6 will be pushed out again. Ballpoint pen refill 8 by pressing
You can retract it and use it in a similar way to a regular ballpoint pen.

When using it as a pointing stick, the telescopic tube can be extended forward from the tip of the ballpoint pen.

When the ballpoint pen refill needs to be replaced, the entire ballpoint pen unit can be unscrewed from the pen hollow shaft 1 and pulled out from the rear, and then the ballpoint pen refill can be removed from the holding tube 7 and a new one inserted.

According to the present invention, since the knocking mechanism is all built into the cap, no parts are lost when replacing the refill, and the operation for replacing the refill is extremely simple.

In addition, according to the present invention, since the ballpoint pen unit is constructed completely separately from the pen hollow shaft containing the retractable tube, the production of each is extremely simple and easy. There is no need to do any special work.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a ballpoint pen for teaching according to the present invention.
FIG. 2 is a sectional view thereof. 1... Pen hollow shaft, 2... Telescopic tube, 4
...Knock type% type%

Claims (1)

[Scope of utility model registration request] A knock-type ballpoint pen unit equipped with a cap with a knock button is inserted from the rear end into a pen hollow shaft that has a built-in multi-stage telescopic tube and can be extended from the tip.
A ballpoint pen for teaching that screws the outer thread of the cap onto the inner thread at the rear end of the pen's hollow shaft.