JPH0452068Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a writing instrument suitable for writing liquids with high viscosity such as cosmetics such as eyeliner and eye shadow.

BACKGROUND TECHNOLOGY Conventionally, as a writing instrument used for writing liquid with a higher viscosity, a piston is provided in the writing liquid chamber of the shaft, and the piston is moved a small amount each time you write.
It is known that writing fluid is used while being extruded to a writing point member.

Furthermore, the piston is moved by a rotary dial provided at the tip of the shaft, and when the screw-in cap is attached, the rotary dial is rotated a small amount at the same time, and the piston is automatically moved in conjunction with the operation of attaching the cap. A writing instrument that extrudes writing fluid has already been devised (Japanese Patent Application No. 58-231091).

Problems that the invention aims to solve: This conventional writing instrument using a rotary dial has a rotary dial in the most visible position near the tip of the shaft, and this has a concave and convex surface for rotational engagement with the cap. Writing instruments for cosmetics, where appearance is particularly important, are dissatisfied with the design.

Further, because of the use of a rotary dial, it is impossible to use a so-called one-touch type cap in which the cap is simply pressed.

Therefore, the purpose of this invention is to create a writing instrument that has the same function as this conventional writing instrument, but eliminates the unevenness for rotational engagement at the tip of the shaft, is aesthetically pleasing, and can also be used with a one-touch type cap. It was devised.

The present invention uses a knock-type mechanism to move the piston, and this knob operation is linked to the attachment and detachment of the cap. The shaft part is made up of a movable part that can move a small amount in the direction, moves the piston a small amount with each movement, and pushes out writing liquid to the writing tip member, and a shaft part that is attached to and detached from this shaft part and covers the writing tip member. In a writing instrument consisting of a cap, one of the main body and the movable part is held in the hand, and when attaching or removing the cap from the shaft part, at the same time, the other of the main body and the movable part comes into contact with the cap,
This writing instrument is characterized by being provided with an operating section that moves the movable section relative to the main body and pushes out writing fluid.

Embodiments Hereinafter, embodiments illustrating the present invention will be described in detail. This writing instrument 10 consists of a shaft part 11 and a cap 12, and the shaft part 11 has a main body 13 and a movable part 14.
It consists of

The main body 13 has a generally cylindrical shape as a whole, and a brush-shaped writing point member 15 is attached to the tip of the main body 13 by pressing it from the inside with a presser member 16. The rear end of this holding member 16 is sharp, and the cartridge 17 is attached thereto by tearing open the membrane plug 18 at the tip and pushing it open. The cartridge 17 has a writing liquid 20 and a rubber piston 21 in a writing liquid chamber 19, and when a push rod 22 protruding backward from the piston 21 is pushed, the writing liquid passes through a passage 23 provided in the presser member 16. The liquid 20 can be pushed out to the writing point member 15. A tongue stopper member 25 projects from the rear end of the main body 13 by a spring 24, and four tongues 26 project forward from the tongue stopper member 25. This tongue piece 26 is arranged in an annular shape and extends so as to wrap around the push rod 22 inside the main body 13, and has an inversely tapered outer surface and has elasticity that expands at the tip. When moved, the intermediate portion slides into contact with the push ring 27 inside the main body 13, and the clamping portion 28 at the tip is opened and closed to clamp and release the push rod 22,
At this time, when moving forward and releasing the push rod 22, push the push rod 22 forward a small amount. On the other hand, when the tongue piece 26 retreats and the clamping part 28 clamps the push rod 22 again, the clamping part 28 is moving relative to the push rod 22, so only dynamic friction acts between it and the surface of the push rod 22. Therefore, slipping occurs and the push rod 22 cannot be moved back.

The movable part 14 is generally cup-shaped, covers the outer periphery and rear end of the main body 13, and has a convex shape 2 provided on the inner periphery.
9 engages with the concave groove 30 on the outer periphery of the main body 13, and the main body 13
It is mated so that it cannot rotate but can move axially. This movable part 14 is always pushed backward by a spring 24 via a tongue piece stopper member 25, and when this spring 24 is compressed and pushed forward against the main body 13, the movable part 14 is pushed through a tongue piece 26 to the push rod 22 and The piston 21 is pushed, and the writing liquid 20 is pushed out to the writing point member 15. Further, an engaging portion 31 made of an annular projection is provided at the front end of the movable portion 14.

The cap 12 has an engaging part 32 formed of an annular groove at its mouth end, and is engaged with the engaging part 31 of the movable part 14 to be attached to the cap. Furthermore, the cap 12 has an abutting part 33, which allows the movable part 14 to be grasped by hand and the cap 1
2, the movable part 14 is moved forward relative to the main body 13 by coming into contact with a step-shaped actuating part 34 provided at the distal end of the main body 13.

Therefore, in this writing instrument 10, when the cap 12 is attached by holding the movable part 14, the movable part 14 moves, the push rod 22 and the piston 21 move forward by a small amount, and the writing liquid 20 is pushed out to the writing tip member 15. Ru.
Therefore, the next time the cap 12 is removed, writing can be started immediately. Note that when writing fluid runs out during writing, the movable part 14 can be moved by holding both the operating part 34 and the movable part 14 by hand.

In this example, the mechanism for pushing the piston is
Although a structure in which the push rod is pushed by a tongue piece is used, any mechanism other than this structure can be used as long as it can push the piston little by little. That is, it is sufficient to have a ratchet mechanism interposed between the piston and the movable part, and for example, the lead adjustment mechanism of various knock-type mechanical pencils can be used as is. Therefore, the operating part is
In addition to being pushed when putting on the cap as in this example, it may also be pulled when removing the cap to push out the writing fluid.
Also, in this example, the movable part is located on the outer periphery of the shaft, and the cap is attached or removed by grasping the movable part with the hand, but it is also possible to expose the main body to the outer periphery of the shaft and operate the cap by grasping the main body. good. in particular,
For example, in this illustrated example, a new outer case is provided, this outer case is integrally attached around the tip of the main body 13 to movably enclose the entire movable part 14, and a spring piece is additionally provided to engage the engaging part. Installed on 31,
If a slit is provided in the outer case to protrude to the outside and is configured to engage with a cap attached to the outer case, the outer case functions as the main body and the spring piece functions as a movable part, and the main body, that is, the outer case, can be moved by hand. When you squeeze it and remove the cap, the movable part, ie, the spring piece, is pulled and the writing fluid is pushed out. Furthermore, for attachment of the cap to the shaft, it is possible to use not only the so-called one-button type shown in the figure but also a normal screw type.

Effects of the invention As is clear from the above, the writing instrument of this invention has
Since the piston moves and pushes out the writing liquid in conjunction with the operation of attaching and removing the cap, it is convenient that no special operation for pushing out the writing liquid is required in normal use. Moreover, since the axial movement of the cap is used to extrude this writing fluid, there is no need for a rotary dial like in the past, and it is sufficient to simply provide an operating part that can be pushed or pulled, making it possible to create an elegant design. It also becomes possible to use a so-called one-touch type cap.

Therefore, the present invention is ideal as a writing instrument for cosmetics, which has particularly strict requirements for design and ease of use.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front sectional view when the cap is attached, FIG. 2 is a front sectional view when the cap is removed, and FIG. 3 is a sectional view taken along the - line in FIG. 1. , FIG. 4 is a sectional view taken along the - line in FIG. 2. 10... Writing implement, 11... Shaft, 12... Cap, 13... Main body, 14... Movable part, 15...
Writing tip member, 19... Writing liquid chamber, 20... Writing liquid, 21... Piston, 22... Push rod, 24...
... Spring, 26 ... Tongue piece, 31, 32 ... Engagement part,
33...Abutment part, 34...Operating part.

Claims (1)

[Scope of utility model registration request] It consists of a main body that has a writing fluid chamber equipped with a piston, and a movable part that can be moved a small amount in the axial direction with respect to the main body, and that moves the piston a small amount with each movement to push out the writing fluid to the writing point member. In a writing instrument consisting of a shaft and a cap that is attached to and detached from the shaft and covers a writing point member, one of the main body and the movable part is held in one hand, and when attaching or removing the cap from the shaft, the main body and the movable part are held at the same time. A writing instrument characterized in that an operating part is provided on the other side of the part to make contact with the cap, move the movable part with respect to the main body, and push out writing liquid.