JPS60234898A - Manufacture of holder made of metal such as stainless in writing utensil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a barrel for a writing instrument.

Generally speaking, when a cap is attached to a cap-type writing instrument, the cap rests on the outer surface of the barrel, and the outer surface of the cap is one step higher than the outer surface of the barrel. There is one in which the outer surface of the cap and the outer surface of the barrel are flush with each other when the cap is fitted with a step of the same size. Comparing these methods, this method is often adopted as it is considered to be advantageous in terms of design since the appearance is flush compared to the latter. By the way, forming a step on the outer surface of the shaft cylinder can be easily carried out by integral molding when the cylinder is made of plastic, but it is rather difficult to form a step when the cylinder is made of metal such as stainless steel. In other words, it is extremely time-consuming and inefficient to form it by processing such as grinding or drawing. Therefore, in the case of metal shaft cylinders, the conventional method of screwing together two pipe bodies with different outer diameters has been adopted in most cases, but this has the drawback of increasing costs. It is an object of the present invention to provide a manufacturing method capable of eliminating such drawbacks and forming a step on the outer surface of a metal shaft cylinder by a simple method.

The present invention provides a pipe body 1 made of metal such as stainless steel having an outer diameter that is the same as the outer diameter of the cap body, and an outer diameter that is approximately the same as the inner diameter of the pipe body 1 and slightly smaller than the inner diameter of the cap body. Similarly, a pipe body 2 made of metal such as stainless steel is provided, and the pipe body 2 is press-fitted or inserted into the inner hole of the pipe body 1 and fixed by adhesive or the like or by soldering, etc., to connect the pipe body 2. By forming a step at the end of the pipe body 1, manufacturing can be completed by simply assembling the two pipe bodies, and processing such as grinding and drawing to form the step and threading are not required. This eliminates the need for formation.

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of the entire writing instrument. The shaft cylinder is made of stainless steel outer cylinder (1) (
In the inner hole of the pipe body (l), there is an inner cylinder (2) (pipe body 2), which is also made of stainless steel and has an outer diameter that is approximately the same as the inner diameter of the outer cylinder (1) and has a slightly bulged shaft center. A threaded part (3) is formed on the inner surface of the tip opening of the protruding inner cylinder (2), which is press-fitted and has both ends on the outer periphery (the same length C on both ends of the IJ), and a base (4) is formed at the same place.
) or screwed together. On the drawing (
5) is a ballpoint pen refill installed in the barrel, (6
) indicates a tail plug and a cap that has the same outer diameter as the outer cylinder (1) of the shaft cylinder and is flush with the outer surface of the outer periphery (1) when fitted to the shaft cylinder, respectively. In the above embodiment, as shown in Fig. 2, the inner periphery (2) is long enough to protrude from both ends of the outer periphery (1), but as shown in Fig. 3, it is formed short and small and separate. It may be press-fitted into both ends of the outer periphery (1).As for the press-fitting method, the inner cylinder (2) may be made to have a bulge as described above, or conversely, the center part of the outer periphery (1) may be slightly bulged. You can also leave it recessed.

There is also a method of making the cross section of the inner periphery (2) elliptical.

As other examples of press-fitting, there may be a method of fixing with adhesive, a method of fixing with soldering, etc.

As described above, the present invention is applicable to processing such as grinding or drawing when forming a step on a barrel made of metal such as stainless steel to make the outer surface of the barrel and the outer surface of the cap flush with each other. The process is extremely simple and can greatly contribute to lower manufacturing costs, as there is no need to form threaded parts, etc., and the process can be completed by simply inserting one pipe body into another pipe body. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the entire writing instrument, FIG. 2 is a longitudinal sectional view of the barrel, and FIG. 3 is a longitudinal sectional view of another embodiment of the barrel. (1)... Outer cylinder, (2)... Inner cylinder, (3)... Threaded part, (4)... Cap, (5)... Ball Henrifie/L/, (6 )... Tail plug, (7)...cap.

Claims (1)

[Claims] A pipe body l made of metal such as stainless steel having an outer diameter that is the same as the outer diameter of the cap body, and an outer diameter that is approximately the same as the inner diameter of the pipe body 1 and slightly smaller than the inner diameter of the cap body. A pipe body 2 made of metal such as stainless steel is provided, and the pipe body 2 is press-fitted or inserted into the inner hole of the pipe body L and fixed with an adhesive or the like or with a beveled solder.
A method for manufacturing a barrel for a writing instrument, characterized in that a stepped portion is formed at the end of a pipe body 1 to which a pipe body 2 is connected.