JPH0230312Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a neck mounting structure for a writing instrument in which the protruding length of a pen nib tip that protrudes from an axially movable neck seat screwed onto the tip of a barrel can be adjusted.

Conventionally, a pen nib that is fitted into a neck seat is made to protrude from the base of the neck seat and come into contact with an ink storage body, and the neck seat is screwed onto the tip of a barrel so that it can move in the axial direction, so that the pen nib can protrude from the base of the neck seat. A writing instrument in which the protruding length of the tip can be adjusted is well known (see, for example, Japanese Utility Model Application Publication No. 179248/1983).

In this known example, the neck seat (corresponding to the cap in the known example) is screwed into a part of the barrel (small diameter portion 12), so when mass-produced,
There is a disadvantage that variations occur in the threaded portion. In other words, the threaded joint between the neck seat and a part of the shaft cylinder often becomes either looser or tighter for each product when mass-produced. It is difficult to obtain a product with a tight threading degree, and if the threading thread is loose, looseness will occur in the threaded part, causing the pen tip to become curved and obstructing the flow of ink, and making writing difficult. There is a problem in that it is difficult to easily and finely adjust the protruding length of the pen tip by moving the head seat smoothly in the axial direction, and a solution to this problem is desired.

This invention is proposed to solve the problem of tight screw threads among these problems.
When the neck seat is screwed into the shaft cylinder, either the neck seat screwing part or the shaft cylinder threading part is configured to be deformable,
The purpose of the present invention is to provide a writing instrument equipped with a useful neck mounting structure that allows the tightly threaded part to loosen to some extent, smoothes the axial movement of the neck, and easily finely adjusts the protruding length of the pen tip. shall be.

To explain the embodiment with reference to the drawings, FIGS. 1 and 2 show an example of a structure in which the neck seat screw part 101 of the neck seat 1 can be deformed.

The neck seat 1 is provided with a thin tube 102 which can be protruded from the tip part separately or in the same body as necessary, the pen tip 2 is passed through the neck seat 1, and the base of the pen tip 2 is protruded from the pen tip through hole of the neck seat 1. , is continuously connected to the tip of the ink guide wick 4. The neck seat threaded part 101 provided on the neck seat 1 has a cylindrical cross section, and is provided with a normal screw 103 on the outer peripheral surface, and the threaded part has one or more threads split in the axial direction.
More than one slit 104 is provided. The outer diameter (diameter between the threads) of the normal screw 103 is configured to be slightly larger than the root diameter of the normal thread 302 on the inner peripheral surface of the shaft cylinder threaded portion 301, and the slit 104 is formed in the neck threaded portion 1.
01 in the axial direction or the base of its screwing part (first
It is constructed by cutting one or more pieces in the axial direction excluding the lower end (in the figure). Shaft tube threaded portion 301 of shaft tube 3
The root diameter of the normal screw 302 provided on the inner circumferential surface is configured to be slightly smaller than the outer diameter of the normal screw 103 of the neck seat threaded part 101, so that the threaded neck seat threaded part 101 is compressed from the periphery and this thread is removed. The joint portion is configured to be deformable in the centripetal direction by the slit 104.

As mentioned above, the normal screw 1 of the neck threaded part 101
03 is the outer diameter, and the normal thread 30 of the shaft cylinder threaded part 301 is
2, and one or more axial slits 104 are provided in the neck threaded part 101, so that the neck threaded part 101 is screwed into the shaft cylinder threaded part 301. When mated, the threaded contact part of the neck seat threaded part 101 is compressed in the centripetal direction by the shaft cylinder threaded part 301,
It is slightly deformed in the centripetal direction by the slit 104,
The screw degree of the screw contact portion tends to be somewhat loose. Therefore, even if the neck seat threaded part 101 and the shaft cylinder threaded part 301 have a slight dimensional error that would result in a tight configuration, they will be loosened to some extent by the threaded engagement and will have a moderate dimensional error. Depending on the degree of screwing, the neck is 1.
It is possible to have a structure in which the screw can be moved smoothly in the axial direction, and also to have a structure in which there is no play in the screw contact portion.

The pen tip 2 in this example has a structure that can be removed or replaced.

As described above, the present invention provides a writing instrument configured to adjust the protrusion length of the nib tip that protrudes from the neck by moving the neck seat screwed onto the barrel tip in the axial direction. An axial slit is provided in the protruding neck threaded portion, and the outer diameter of the normal thread on the outer peripheral surface of the neck threaded portion is made relatively larger than the root diameter of the normal thread on the inner peripheral surface of the shaft cylinder threaded portion. Because of this structure, even if the neck threaded part and the shaft cylinder threaded part have a slight dimensional error that would result in a tight configuration, if either one is deformed due to mutual screwing, it will loosen slightly. This results in an appropriate degree of screw engagement, which allows the neck to move smoothly in the axial direction, and allows for easy and fine adjustment of the protruding length of the pen tip. This eliminates the risk of looseness occurring in the threaded part, eliminates the drawback that it becomes difficult to write, provides a useful writing instrument, and achieves the intended purpose.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal front view showing the mounting structure of the present invention, and FIG. 2 is a cross-sectional view taken along the - line in FIG. 1. In the figure, 1 is the neck seat, 101 is the neck threaded part, 103
is a normal screw, 104 is a slit, 2 is a pen tip, 3
301 is a shaft cylinder threaded portion, and 302 is a normal screw.

Claims (1)

[Scope of utility model registration request] The pen tip fitted into the neck seat is made to protrude from the base of the neck seat, and the neck seat is screwed onto the tip of the shaft cylinder so that it can move in the axial direction, so that the protruding length of the pen tip that can protrude from the neck seat can be adjusted. In the constructed writing instrument, an axial slit is provided in the neck threaded part protruding from the neck seat, and the outer diameter of the normal thread on the outer circumference of the neck threaded part is the root diameter of the normal thread on the inner circumference of the barrel threaded part. The neck mounting structure has a relatively larger diameter.