JP2589405Y2 - Capillary writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capillary writing instrument.
In more detail, a thin tube is attached to the tip of the holder member,
A needle body is slidably disposed in the thin tube, an axially movable weight member is fixed to a rear portion of the needle body, and an inner wall of the holder member and a front portion of the weight member are configured to abut in the axial direction. The present invention relates to a capillary writing instrument.

[0002]

2. Description of the Related Art In a conventional capillary writing instrument of this kind,
The stopper on the inner wall of the holder against which the weight member front comes into contact has a conical tapered surface, and the needle body and the weight member are
It is guided to the center of the holder member where the thin tube is located.
(For example, Japanese Utility Model Publication No. 1-18385)

[0003]

However, in practice, the needle body is bent (mounted) in the axial direction from the fixed position or is not fixed to the center position of the weight member due to mounting variation (center). Misalignment). In such a case, at the time of writing, the needle comes into contact with the inner wall of the thin tube or the inner wall of the center hole of the holder member, and an unreasonable radial force is applied to the needle, thereby hindering the smooth movement of the needle in the axial direction. For this reason, the original function of the needle body for removing dust clogged in the thin tube was not sufficiently satisfied, and this had an adverse effect on ink delivery.

[0004] The present invention is intended to solve the above-mentioned problem, and even if the needle body is bent or misaligned due to the attachment of the needle body and the weight member, the needle body smoothly moves through the narrow tube. An object of the present invention is to provide a slidable capillary writing instrument.

[0005]

According to the present invention, a thin tube 1 is mounted on the tip of a holder member 2, a needle 3 is slidably disposed in the thin tube 1, and a shaft is attached to a rear portion of the needle 3. A thin tube type 1 writing instrument in which a directional movable weight member 4 is fixed and the inner wall of the holder member 2 and the front part of the weight member 4 are abutted in the axial direction, and a needle body fixing part 41 is provided on the front part of the weight member 4. , A projection 42 is provided in front of the needle fixing portion 41, and a stopper 21 is provided on the inner wall of the holder member 2 so that the projection 42 comes into contact with the projection 42. 2
In the first contact state, the front part of the weight member 4 is required to be configured to be movable in the radial direction with respect to the stopper 21.

The weight member 4 may be made of a suitable material such as metal or plastic, and may be composed of one member or a combination of two members. The means for fixing the needle body 3 and the weight member 4 is an adhesive,
Any of welding, fitting, caulking, etc. may be used.

[0007]

Since the protrusion is provided in front of the needle fixing portion, the needle can be moved in the radial direction with respect to the protrusion in the vicinity of the protrusion. Further, the front portion of the weight member 4 is movable in the radial direction with respect to the stop portion 21 in a state where the protrusion portion 42 and the stop portion 21 are in contact with each other.
Thus, even if the needle body 3 is displaced from the center or bent by the attachment to the weight member, the sliding inside the thin tube 1 is not hindered, and the smooth movement inside the thin tube 1 is possible.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIGS. 1 to 6 show a first embodiment of the thin-tube writing instrument according to the present invention. The shaft cylinder 6 has an ink reservoir 5 attached to the front, and an ink tank 61 at the rear. The ink reservoir member 5 is a conventionally known member having a number of comb grooves arranged on a peripheral surface thereof and having a function of temporarily holding overflowing ink due to an increase in pressure in the ink tank 61. At the front of the ink storage member 5, a holder member 2 having a thin tube 1 fixed to the tip is attached. Also,
The ink reservoir member 5 is provided with an inner hole 51, in which a weight member 4 having a needle body 3 fixed to a front portion is provided.
It is housed slidably in the axial direction. The inner wall of the holder member 2 is formed with a planar stopper 21 with which the front part of the weight member 4 contacts.

The weight member 4 comprises an inner cylinder 43 made of a stainless steel pipe and an outer cylinder 44 made of a polyacetal resin. A needle fixing portion 41 is formed at the front of the inner cylinder 43, and the needle 3 is inserted into the front of the inner cylinder 43, and the needle is deformed by pressing the front of the inner cylinder 43 inward. The rear part of the body 3 is fixed by caulking.

The front end of the inner cylinder 43 is expanded by a wedge-shaped pressing element so as to form a notch 45 for guiding ink. A protruding portion 42 is formed to abut (see FIGS. 3, 4, and 6). The outer cylinder 44 is provided with eight ribs 46 on its outer periphery to enable quick ink discharge. Further, the needle body fixing portion 41 of the inner cylinder 43 is
Bulging outward, and the outer cylinder 44
Are fitted (see FIG. 5). The expanded projection 42 also functions as a stopper for preventing the outer cylinder 44 from moving forward with respect to the inner cylinder 43.

A coil spring 47 is interposed between the rear end of the outer cylinder 44 and the rear end of the inner hole 51 to urge the weight member 4 forward. An O-ring 48 is fitted to the rear portion of the inner cylinder 43, and the coil spring 4
7 is held inside.

FIG. 7 shows a second embodiment. Holder member 2
The stopper 21 formed on the inner wall of the ink guide groove 21 has a flat shape perpendicular to the axial direction, and has a slit-like ink guide groove 21.
1 is installed vertically. Further, the rear end of the center hole of the holder member 2 is tapered so as to facilitate insertion of the needle body 3.

FIG. 8 shows a third embodiment. Holder member 2
The stop portion 21 formed on the inner wall of the first member has a planar shape perpendicular to the axial direction. An annular projection 212 is formed at the rear end of the center hole of the holder member 2, and an ink storage gap 23 having a capillary force is formed between the inner wall of the projection 42 of the weight member 4 and the outer wall of the annular projection 212, The ink held there prevents air from entering.

FIG. 9 shows a state in which the needle body 3 is attached to the weight member 4 so as to be bent in the axial direction in the first embodiment (bent state). In this case, only the front portion of the weight member 4 moves in the radial direction while abutting on the stopper 21, and since there is room for the needle body 3 to move in the radial direction in the vicinity of the protrusion 42, the needle body 3 is formed into a thin tube 1 can be inserted straight.

FIG. 10 shows a state in which the needle body 3 is mounted so as to be shifted from the center of the weight member 4 in the first embodiment (center shifted state). In this case, since the weight member 4 moves in the radial direction while abutting on the stopper 21, the needle body 3
Can be inserted into the capillary tube 1 without applying excessive force.

[0017]

According to the present invention, even if the needle body is displaced from the center or bent by the attachment of the needle body and the weight member, the needle body does not hinder sliding in the thin tube. Smooth movement in the thin tube becomes possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of FIG.

FIG. 3 is an enlarged vertical sectional view of the weight member of FIG. 1;

FIG. 4 is an end view taken along line AA of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is an external view of a tip end of the inner cylinder of FIG. 3;

FIG. 7 is an enlarged longitudinal sectional view of a main part showing a second embodiment.

FIG. 8 is an enlarged vertical sectional view of a main part showing a third embodiment.

FIG. 9 is an enlarged longitudinal sectional view of an essential part for explaining the operation of the first embodiment in a bent state of the needle body.

FIG. 10 is an enlarged vertical cross-sectional view of a main part, illustrating the operation of the needle body center shifted state of the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Narrow tube 2 Holder member 21 Stop part 211 Ink guide groove 212 Annular protrusion 23 Ink storage gap 3 Needle 4 Weight member 41 Needle body fixing part 42 Projection 43 Inner cylinder 44 Outer cylinder 45 Notch 46 Rib 47 Coil spring 48 O-ring 5 Ink reservoir member 51 Inner hole 6 Shaft cylinder 61 Ink tank

Claims (1)

(57) [Scope of request for utility model registration] 1. A thin tube 1 is mounted on a tip of a holder member 2,
A needle body 3 is slidably disposed in the thin tube 1, an axially movable weight member 4 is fixed to a rear portion of the needle body 3, and an inner wall of the holder member 2 and a front portion of the weight member 4 are arranged in the axial direction. In the capillary-type writing instrument configured to abut against the needle member, a needle fixing portion 41 is provided in front of the weight member 4, a projection 42 is provided in front of the needle fixing portion 41, and the projection is formed on an inner wall of the holder member 2. 42 is provided so that the front portion of the weight member 4 can move in the radial direction with respect to the stop portion 21 in a contact state between the protrusion portion 42 and the stop portion 21. A capillary writing instrument characterized by being made.