JPH0337994Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clip attachment structure for a writing instrument having a large-diameter shaft hole in the barrel head.

For example, when attaching a clip to a writing instrument that has a large diameter hole in the head of the barrel, such as a knock-type sharp pencil, the thin wall of the barrel must be used, making it difficult to maintain strength and durability. Problems are likely to occur.

To give an example of a conventional clip attachment structure, as shown in FIG.
A fixing ring 2 having a small diameter portion 22 and a small diameter portion 22 is fitted and fixed, and a crown 3 is externally inserted into the small diameter portion 22. The ring-shaped base 41 of the clip 4 is held between the tip end surface 31 of the clip 3 and the shaft hole 5 is formed through the ring-shaped base 41 of the clip 4.

However, in this conventional clip attachment structure, when a force is applied to the clip 4 in the direction of the arrow A in FIG.
At this time, a force acts to force the end surface 23 of the fixing ring 2 and the distal end surface 31 of the crown 3 apart. Since this force is a large force amplified by the principle of leverage, the crown 3 will come off if it is not firmly fixed. For this reason, the crown had to be assembled carefully to ensure that it was firmly fixed, resulting in poor work efficiency.

The present invention has been developed by focusing on the above-mentioned problems, and solves the above-mentioned problems by fitting and fixing the clip only to the fixing ring, and has a writing instrument clip mounting structure that is trouble-free and easy to assemble. It provides:

Hereinafter, the present invention will be explained based on illustrated embodiments.
Note that the same parts are given the same reference numerals.

2 to 4 show an embodiment of the present invention.

A cylindrical fixing ring 2 is fitted and fixed to the head of the shaft cylinder 1. The clip 4 has an open ring-shaped base 41 with a crack 42 carved at the tip. The fixing ring 2 includes a receiving end 24 having an outer diameter that is approximately the same as the inner diameter R1 of the base 41 of the clip 4, a guide portion 25 whose diameter tapers from the receiving end 24 toward the other end, and the guide portion 25 and others. Between the end 26 side,
A ring-shaped groove 27 is formed having a bottom having an outer diameter that is approximately the same as the inner diameter of the open ring-shaped base 41 of the clip 4, and an outer diameter such that the base 41 is tightly fitted. The neck portion 43 of the clip 4 fits into a notch 11 carved in the head of the barrel 1. A crown 3 is fitted onto the receiving end 24 side of the fixing ring 2, but its distal end surface 31 is spaced apart from the base 41 of the clip 4. A shaft hole 5 is formed through these.

When assembling the clip 4 to the barrel 1, first,
The base 41 of the clip 4 is inserted into the receiving end 24 of the fixing ring 2. Inner diameter of base 41 and receiving end 24
Since it is set to be approximately the same as the outer diameter of , it can be easily extrapolated. When the base 41 is pushed further, the guide part 2
5, but since the base 41 is formed in an open ring shape, the crack 42 widens and the diameter increases, making it easy to push forward. The base portion 41 that has climbed over the guide portion 25 falls into the ring-shaped groove portion 27, reduces its diameter, and fits into the ring-shaped groove portion 27. Next, while fitting the neck 43 of the clip 4 into the notch 11 of the barrel 1, the fixing ring 2 is
The other end 26 side is inserted into the head of the shaft cylinder 1 and fitted with an adhesive or the like. In this state, the clip 4 is securely attached to the barrel 1 regardless of the presence or absence of the crown 3.
Since the neck portion 43 fits into the notch 11, the clip 4 will not rotate. Next, the crown 3 is inserted over the receiving end 24 of the fixing ring 2 and fitted with an adhesive or the like. The tip surface 3 of the crown 3 when the fitting is completed.
1 is separated from the base 41 or neck 43 of the clip 4, and the gap has a size such that it will not be distorted even if the base 41 or neck 43 is slightly deformed when the clip 4 is pulled up for use. Therefore, since the crown 3 is fitted onto the fixing ring 2 independently of the clip 4, it will not be twisted or come off.

According to this embodiment, the structure for attaching the clip 4 to the crown 3 does not have to be strong, making it possible to reduce the weight and simplify the structure.

Note that the receiving end portion 24 and the guide portion 25 do not need to be in a continuous ring shape, and may be disposed intermittently in a ring shape.

According to the clip mounting structure of the writing instrument according to the present invention, even if the clip is pulled out, there is no risk that the mounting part will be pried, so the crown etc. will not come off, the assembly workability is good, and the strength is high. It is possible to provide a writing instrument with improved durability and no failure.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main part of the conventional example, Figures 2 to 4
The figures show one embodiment of the present invention, FIG. 2 is a sectional view of the main part, FIG. 3 a is a partially cutaway side view of the fixing ring, and FIG. 3 b is a side view of the crown. Figure, 4th
Figure a is a perspective view of the barrel head, and Figure 4b is a perspective view of the vicinity of the clip base. 1... Axial tube, 2... Fixing ring, 3... Crown,
4... Clip.

Claims (1)

[Claims for Utility Model Registration] A clip attachment structure for a writing instrument having a large-diameter shaft hole in the barrel head, wherein the base of the clip is formed in an open ring shape, and the barrel head has a fixing ring. the crown is fixed to the fixing ring, and the fixing ring is cylindrical and has a receiving end having an outer diameter substantially the same as the inner diameter of the open ring-shaped base of the clip; A guide portion that tapers in diameter from one end to the other end, and a portion having an outer diameter that is approximately the same as the inner diameter of the open ring-shaped base portion of the clip, and a portion between the guide portion and the other end side. A ring-shaped groove is formed with a bottom having an outer diameter that is suitable for tight fit, and the open ring-shaped base of the clip is inserted into the receiving end of the fixing ring, and the clip is caused to ride over the guide part to form the ring-shaped groove. A writing instrument characterized in that the crown and the base of the clip are spaced apart from each other so that the base of the clip cannot pry the crown when the clip is raised. Clip mounting structure.