JPH0211192Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cartridge-type writing instrument, particularly a writing instrument suitable for use with highly viscous writing liquids such as liquid cosmetics such as eyeliner and liquid lipstick.

BACKGROUND TECHNOLOGY Conventionally, as a cartridge-type writing instrument used for writing liquid with high viscosity such as liquid cosmetics, a piston is provided in the cartridge and the piston is used to push out the writing liquid. 50-35894).

Problems that the invention aims to solve In this conventional writing instrument, a push rod that pushes the piston is provided on the writing instrument body, so the push rod pushes the piston, and when the writing liquid in the cartridge is used up, a new cartridge is inserted. When installing, it is necessary to return the push rod to its original position.

The present invention aims to eliminate this inconvenience and realize a writing instrument that does not require the operation of returning the push rod when replacing the cartridge.

Means for Solving the Problems The present invention provides a push rod on the cartridge side, a rotational engagement part that has a non-circular cross section and extends in the longitudinal direction, and uses this rotational engagement part to push the writing instrument body side. The rotary dial portion can be engaged with the push rod regardless of its longitudinal position.

That is, the present invention provides a writing instrument consisting of a cartridge containing writing fluid and a writing instrument body, in which the cartridge is provided with a piston that pushes out the writing fluid,
A threaded rod is provided which is screwed into the cartridge and rotates to push the piston, a rotational engagement portion having a non-circular cross section and extending in the longitudinal direction is provided on the threaded rod, and a rotation-stopping engagement portion is further formed on the cartridge. The main body is provided with a rotating dial part, and the rotating dial part is provided with a main body-side rotating engaging part that engages and rotates the threaded rod regardless of its longitudinal position. This cartridge-type writing instrument is characterized in that it is provided with a main body-side rotation-stopping engagement portion that engages and prevents rotation of the cartridge.

Embodiment An embodiment illustrating the present invention will be described below. This writing instrument 10 is composed of a cartridge 11 and a writing instrument main body 12. The cartridge 11 has a substantially cylindrical shape, stores a writing liquid 13 such as a liquid cosmetic inside, and has a mouth end sealed with a ball stopper 14. A rubber piston 15 is provided inside the cartridge 11, and a threaded rod 16 extends rearward from the piston 15, and a male thread 17 formed on the outer periphery of the piston 11 is screwed into a female thread 18 at the rear of the cartridge 11. When the rod 16 is rotated, the piston 15 moves forward and pushes out the writing liquid 13. A rotational engagement part 19 made of a hexagonal column-shaped hole is formed inside the threaded rod 16, and a rotation-stopping engagement part 20 made of six vertical grooves is formed on the circumferential surface of the cartridge 11.

The writing instrument main body 12 has a main body front part 21 and a main body rear part 2.
It consists of 2. The front part 21 of the main body has a writing tip member 23 shaped like a brush at the tip, into which the tip of the cartridge 11 is inserted and the writing liquid 13 in the cartridge 11 is guided to the writing tip member 23, and the tip is covered with a cap 24. be able to. Furthermore, the main body side rotation stop engaging part 2 is made up of six vertical protrusions on the rear inner periphery of the main body front part 21.
5 is formed and engages with the rotation stopper engagement portion 20 of the cartridge 11 to prevent the cartridge 11 from rotating.

The rear body 22 is screwed to the front body 21 and covers the rear of the inserted cartridge 11.
At the rear end of this main body rear part 22 is a rotary dial part 26.
is rotatably attached, and this rotary dial part 2
A main body side rotational engagement part 27 made of a hexagonal columnar rod protrudes forward from 6, engages with the rotational engagement part 19 of the cartridge 11, and can rotate the threaded rod 16 by turning the rotation dial part 26. .
Furthermore, a protruding piece 28 is formed on this rotary dial part 26, and this protruding piece 28 lightly engages with a protrusion 29 provided on the inner peripheral surface of the rear part 22 of the main body, so that the rotary dial part 26 can be rotated by hand. I'm starting to feel a click.

Since this writing instrument 10 has the above configuration, the cartridge 11 is inserted into the front part 21 of the writing instrument main body 12, the rear part 22 of the main body is screwed, and the cartridge 11 is attached. When rotated a small amount, the threaded rod 16
is rotated, the piston 15 moves forward, the writing liquid 13 is pushed out, and writing can be performed. When the threaded rod 16 is moved forward and the writing fluid 13 in the cartridge 11 has been used, the cartridge 11 is removed and a new cartridge is reinstalled as described above. At this time, the main body side rotational engagement part 27 engages with the rotational engagement part 19 of the cartridge 11 regardless of the position of the threaded rod 16, so the rotation dial part is rotated in the opposite direction as in the conventional case.
There is no need to perform an operation to return the threaded rod to its position.

In the above embodiment, a hexagonal cylindrical hole was used as the rotational engagement part, but if a vertical groove is formed on the surface of the threaded rod and it is used, or if the cross section is non-circular and extends in the longitudinal direction, Any shape can be used and engagement can be achieved regardless of the position of the threaded rod.

Further, the rotation-stopping engaging portion can be formed not only around the cartridge but also at the front end of the cartridge, and it goes without saying that its shape is arbitrary.

Effects of the invention As is clear from the above, the writing instrument of this invention has
The threaded rod that pushes the piston of the cartridge is provided on the cartridge rather than on the writing instrument itself, and is configured so that it can engage with the rotating dial provided on the writing instrument body regardless of the position of the threaded rod, so when replacing the cartridge. Simply replacing the cartridge with a new one eliminates the need for the conventional operations of reversing the rotary dial and returning the threaded rod, making it extremely easy to handle.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front sectional view, FIG. 2 is a front view of a cartridge, FIG. 3 is a sectional view taken along the line - - in FIG. 1, and FIG. 4 is a - line sectional view in FIG.
FIG. 10...Writing instrument, 11...Cartridge, 12
... Writing instrument body, 13 ... Writing liquid, 15 ... Piston, 16 ... Threaded rod, 17 ... Male thread, 18 ...
...Female thread, 19...Rotation engagement part, 20...Rotation stop engagement part, 25...Body side rotation stop engagement part, 26...
Rotating dial part, 27... Main body side rotating engagement part.

Claims (1)

[Claim for Utility Model Registration] A writing instrument consisting of a cartridge containing writing fluid and a writing instrument body, wherein the cartridge is provided with a piston for pushing out the writing fluid, and a threaded rod is screwed onto the cartridge and rotates to push the piston. A rotary engagement portion having a non-circular cross section and extending in the longitudinal direction is provided on the threaded rod, a rotation preventing engagement portion is formed on the cartridge, a rotation dial portion is provided on the writing instrument body, and a screw is attached to the rotation dial portion. Regardless of the longitudinal position of the rod,
It is characterized by providing a main body side rotational engagement part that engages and rotates, and further includes a main body side rotational engagement part that engages with a rotation prevention engagement part of a cartridge and prevents rotation of the cartridge. Cartridge type writing instrument.