JPH0535373U - Small tube type writing instrument mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] Make sure that the tip of the tip of the pen is aligned with the center of the tip by firmly pressing the tip of the tip of the pen to the holder. [Structure] A pen body 2 is provided at the tip of a holder 1 made of synthetic resin. A plurality of protrusions 7C are formed inside the fixed portion 7B of the metal tip metal 7. Further, the inner diameters of the plurality of ridges 7C are formed so as to become gradually smaller toward the tip end side. This advance 7
The fixing portion 7B of 1 is press-fitted and fixed to the holder 1, and the pen body 2 is supported by the inner hole of the tip 7A of the tip metal 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tip mounting structure of a small tube type writing instrument provided with a tip supporting a pen body.

[0002]

[Prior Art]

 In conventional small-tube writing instruments, a small-tube pen is attached to a synthetic resin holder.

[0003]

[Problems to be solved by the device]

 However, in the conventional case, when the holder is molded, the concentricity between the pen body mounting hole and the outer diameter is poor, and the outer diameter of the holder and the center of the pen body are misaligned. Therefore, when a conventional small-tube writing instrument is used for a plotter that is frequently replaced and used for drawing, the drawing line is displaced and high-precision drawing cannot be performed. An object of the present invention is to provide a tip attachment structure for a small tube type writing instrument that solves the above problems.

[0004]

[Means for Solving the Problems]

 According to the present invention, a pen body is provided at the tip of a synthetic resin holder. In addition, a plurality of ridges are formed inside the fixed portion of the metal tip metal, and the inner diameters of the ridges are gradually reduced toward the tip side. The fixing portion of the tip metal is press-fitted and fixed to the front portion of the holder, and the pen body is supported by the front inner hole of the tip metal.

[0005]

【Example】

 1 and 2 show an embodiment of the present invention, in which a ceramic pen body 2 is provided at the tip of a holder 1 and a pen core 3 is attached to the rear portion of the holder 1. In the holder 1 and the pen core 3, a pendulum 5 provided with a center core 4 at the front is incorporated so as to be slidable in the longitudinal direction. Further, a spring 6 is stretched between the rear outer stage 5A of the pendulum 5 and the rear inner stage 3A of the pen core 3, and the tip of the center core 4 projects slightly from the pen body 2. The tip 7A of the tip 7 is formed to project in a small diameter, and the inner diameter of the inner hole of the tip 7A is formed to be slightly larger than the outer diameter of the pen body 2. Further, a plurality of ridges 7C are formed inside the fixed portion 7B of the tip metal 7, and the inner diameter 7D of the ridges 7C is formed so as to become gradually smaller as it is located on the tip side.

[0006] To process the ridge 7C, the fixing portion 7B of the tip metal 7 is formed in advance into a tapered shape having a smaller diameter as it goes to the tip side, and then the front and rear of the ridge 7C are cut inward. As shown in FIG. 3, the tip 7 is formed such that the inner diameter 7D of the ridge 7C is gradually decreased as the inner diameter 7D is located on the tip side, or the hole formed in the fixed portion 17B of the tip 17 is cut. Then, a plurality of ridges 17C are formed by machining, and then the inner diameter 17D of the ridges 17C is processed so as to be gradually reduced in diameter as it goes to the tip side to form a tip 17 as shown in FIG. .

A plurality of protrusions 1A extending in the longitudinal direction are formed on the front portion of the holder 1, and the fixing portion 7B of the tip metal 7 is press-fitted and fixed to the front portion of the holder 1 to fix the tip 7A of the tip metal 7 The pen body 2 is supported by the inner hole. At this time, since the protrusion 7C of the tip metal 7 is formed to have a smaller diameter at the tip, even if the protrusion 1A of the holder 1 is slightly cut by the protrusion 7C on the rear end side, 7C has a diameter larger than that of the protrusion 7C, and each protrusion 7C of the tip metal 7 surely bites into the protrusion 1A of the holder 1 to be press-fitted and fixed, and a reliable press-fitted fixing force can be obtained.

[0008]

[Effect of the device]

 Therefore, since the outer diameter of the tip metal and the center of the pen body are surely aligned with each other, even if the tip is guided like a plotter to perform the drawing, the handwriting is not distorted and accurate drawing can be performed. Furthermore, since the tip metal can be press-fitted and fixed to the holder with a strong fixing force, there is no fear that the tip metal will come off or tilt during use.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a tip attachment structure of a small tube type writing instrument of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing the tip metal of FIG.

FIG. 4 is a cross-sectional view showing another embodiment of the tip metal of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holder 2 Pen body 7 Tip 7B Fixed part of tip 7 7C Protrusions of tip 7 7D Inner diameter of tip 7 17 Tip 17B Fixed part of tip 17 17C Protrusion of tip 17 17D Tip 17 Inner diameter

Claims (1)

[Scope of utility model registration request] 1. A small-tube writing instrument in which a pen body is provided at the tip of a synthetic resin holder and a metal tip supporting the pen body is press-fitted and fixed to the holder. A tip mounting structure for a small tube type writing instrument, wherein a plurality of ridges are formed on the inner side of a fixed portion of gold, and the inner diameters of the ridges are formed so as to become smaller toward the tip end side.