JPH0351179Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a knurled writing instrument, such as a felt-tip pen or a water-based ballpoint pen, which uses evaporative or volatile ink and is particularly easy to assemble.

Various types of writing instruments that use evaporative or volatile ink, such as felt-tip pens and water-based ballpoint pens, have been proposed in the past, but all of them have poor sealing properties and the ink easily evaporates.
There were disadvantages such as the knocking operation could not be performed smoothly and furthermore, it required time and effort to assemble the entire writing section.

The object of this invention is to eliminate the above-mentioned drawbacks, provide a knurled writing instrument that has extremely good sealing properties when the lead is stored, effectively prevents ink evaporation, and is particularly easy to assemble.

An embodiment of this invention will be described below with reference to the drawings.

A refill 2 that is slidable in the axial direction and replaceable, and a writing section storage function 3 disposed at the tip of the refill 2 are disposed inside the outer cylinder 1.
The outer cylinder 1 has a tip 4 which is detachably provided at the tip. The refill 2 and the writing part storage mechanism 3 form a writing part unit A.

The refill 2 has an ink container 5 and a writing section 6 at the tip of the ink container 5. The inside of this ink storage body 5 is filled with an absorber 7 impregnated with evaporable, volatile, or water-based ballpoint pen ink, felt-tip pen ink, etc., and the rear end of this ink storage body 5 is filled with an absorbent body 7 impregnated with evaporable, volatile, or water-based ballpoint pen ink, felt-tip pen ink, etc. A feeding mechanism (not shown), such as a rotary cam set, is disposed for performing a protruding and retracting motion. It should be noted that this feeding mechanism may have any structure other than the rotary cam set as long as it can move the refill 2 forward and backward by a knocking action.

Further, in this embodiment, the writing section 6 includes a protruding tube 8 provided at the tip of the ink storage body 5, and a core section 9 that passes through the protruding tube 8 and is partially buried in the absorbent body 5. has. An air hole 10 essential for ink circulation is provided between the two, and the ink storage body 5 is connected to the outside air. Further, 11 is a guide tool.

Note that the writing section 6 is not limited to this embodiment in any way; for example, the protruding tube 8 may be integrally molded with the ink storage body 5 or separately molded, or the protruding tube 8 may be omitted and the guide tool 8a Core part 9 covered with
may be directly press-fitted into the ink storage body 5.

As shown in the first drawing, the entire writing unit storage mechanism 3 is removably fitted into the refill 2 (in this embodiment, the projecting tube 8). This writing unit storage mechanism 3 includes a base cylinder 11 which is removably fitted to the refill 2 and has a slide bar 11a connected thereto.
and a lead chuck 13 that is slidably engaged with the engaging portion 11b at the tip of the slide bar 11a of the base cylinder 11 and opens and closes the cylindrical seal (seal portion) 12;
It has a chuck tightening ring 14 that tightens the lead chuck 13, and an elastic body 15 that is elastically attached between the chuck tightening ring 14 and the base cylinder 11.

Here, the lead chuck 13 and the slide
The engagement with the bar 11a is achieved by simply hooking the two together, but since both are biased by the elastic body 15 to prevent this engagement from slipping out, under normal conditions, It is designed so that it will not easily come off.

Further, the cylindrical seal 12 is formed of an elastic member such as rubber, and as shown in the first figure, a protrusion 12a is provided on the inner wall thereof to abut against and seal the protruding tube 8, and on the other hand, on the outer wall thereof, a protrusion 12a is provided. , a protrusion 12b is provided which is press-fitted into the recess 13a of the lead chuck 13. Therefore, when the slide bar 11a is clicked,
Even if it slides in the forward direction with respect to the lead chuck 13 that is locked to the inner wall protrusion 4a of the tip tool 4, it does not come off. Furthermore, as shown in the first diagram, this cylindrical seal 12 simultaneously seals the air hole 10, which plays an important function in ink distribution, as well as the writing section 6.
Not only does the ink not evaporate, but it also prevents the ink from flowing during sealing.

Next, an explanation will be given of the assembly operation of the knob-type writing instrument according to this invention.

First, after assembling the writing unit A, the outer cylinder 1
Insert inside.

That is, after assembling the chuck tightening ring 14 to the lead chuck 13, the reflex body 2 equipped with the elastic body 15 and the base cylinder 11 having the slide bar 11a are respectively assembled, thereby completing the assembly of the writing unit A. Once assembled, the unitized state can be maintained by the urging force of the elastic body 15. After that, when this writing unit A is inserted from the rear end of the outer cylinder 1, the front end of the writing unit A is inserted into the stepped part 1.
It is locked at a. Therefore, the entire writing instrument can be assembled very easily.

Next, the operation and effect of this invention will be explained.

First, in the storage state of the writing section shown in FIG. 1, as mentioned above, it is sealed with the cylindrical seal 12.
Ink evaporation and flow are reliably prevented.

Next, when the rear end of the ink storage body 5 is knocked, the entire refill 2 moves forward by a feeding function (not shown), but the chuck tightening ring 14 engages with the stepped portion 1a of the outer cylinder 1. Furthermore, since the lead chuck 13 is stopped from moving together with the cylindrical seal 12 by the inner wall protrusion 4a of the tip 4, the core portion 9
protrudes from the tip 4 as shown in the third figure, and becomes ready for writing.

At this time, since the cylindrical seal 12 is made of an elastic member, the protruding opening of the core portion 9 can be opened by its own elasticity. Furthermore, even if the opening is insufficient, the tip of the protruding tube 8 pushes open the inner wall of the cylindrical seal 12, so there is no risk of ink adhering to the cylindrical seal 12. Furthermore, since the writing section 6 is moved in a state where the slide bar 11a slides on the lead chuck 13 and moves overlapping each other,
Able to perform smooth and rational movements.

As described above, according to this invention, after assembling the writing unit in advance, simply inserting it into the outer cylinder,
Since it can be assembled, the assembly operation is extremely easy and efficient.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of one embodiment of this invention;
The figure is the same side view, Figure 3 is the same, a plan view when the core is protruding,
FIG. 4 shows a front view of the same. DESCRIPTION OF SYMBOLS 1...Outer tube, 1a...Step part, 2...Refill, 3...Writing part storage mechanism, 6...Writing part, 11
... Base tube, 11a ... Slide bar, 12 ...
Seal portion, 13...Lead chuck, 14...Chuck tightening ring, A...Writing unit.

Claims (1)

[Scope of utility model registration request] It is equipped with a unitized writing unit A, and an outer cylinder 1 that stores the writing unit A therein and locks the writing unit A at a stepped portion 1a. A refill 2 housed in a cylinder 1 so as to be slidable in the axial direction, a lead chuck 13 disposed at the tip of the refill 2 and tightened by a chuck tightening ring 14, and a lead chuck 13 fixed inside the lead chuck 13. The writing part 6 of the refill 2 opens and closes by a knocking action.
a base cylinder 11 having a slide bar 11a inserted into the refill 2 and slidably engaged with the lead chuck 13; and a base cylinder 11 and the chuck tightening ring 14. and an elastic body 15 landed between the
A knot-type writing instrument characterized by being formed so that it can be handled in a unitized state.