JPS5933501B2 - How to make grip scissors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In gripping scissors in which an upper blade 2 and a lower blade 3 are joined to the tip of a handle 1 bent into a U-shape, a stepped portion 4 is formed on the upper surface of the neck 3a of the lower blade 3, commonly known as the gusset. This serves as a stopper for the upper blade 2.

The conventional manufacturing method for gripping scissors is as shown in Figure 11.
A lower blade A that does not include a neck is manufactured, butt-welded to a handle C at a weld line B, and a stepped portion D is formed by applying build-up to a part of the handle C.

In other words, since the step is formed by overlaying extremely mild steel,
Due to long-term use, the stepped portion would wear out and no longer function as a stopper, posing a risk of injury.

In forming the upper blade 2 and the lower blade 3, the present invention includes neck portions 2a and 3a, respectively, which are joined to the handle 1, and in order to form the stepped portion 4, the neck portion of the lower blade is A protrusion T protruding inward, which is the cutting edge side, is formed, and the protrusion is crushed by a hammering operation in the width direction, and then forged to make the back surface flush with the other side, and the protrusion T is formed on the blade surface side, which is a cutter steel. By using this bulge to form a stepped part with cutter steel, it is possible to make durable gripping scissors that are resistant to wear.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the method for manufacturing gripping scissors of the present invention will be described with reference to the accompanying drawings.

The blade of the scissors is made of a composite material in which a thin blade steel 5 is integrally layered on one side of a very mild steel plate, and as shown in Figure 2, the upper and lower blades have a shape that includes the neck. The material is removed with the blade surfaces butted against each other.

That is, a blade body prototype 6 for one pair of scissors is made, and as shown in FIG. 3, it is divided into an upper blade 2 and a lower blade 3 along the center of the blade steel 5.

At this time, at least a protrusion T is formed on the neck portion 3a of the lower blade 3 to protrude inward on the cutting edge side of the composite material member on which the cutter steel is laminated. Then, as shown in FIG. 4, an upper blade 2 and a lower blade 3 are butt-welded to both ends of the rod-shaped handle 1, respectively. Next, as shown in FIG. 5, the protrusion T of the neck portion 3a is hammered in by a hammering operation in the width direction during hot forging to eliminate the protrusion.

Then, the volume of the protrusion T becomes thicker, and both the front and back surfaces bulge as shown in FIG. 6, and the cutter steel 5 comes to be distributed in such a way as to cover the upper surface of the extremely mild steel.

Thereafter, the extremely mild steel surface, that is, the back side of the blade surface, is made to be flush with each other, and the increased wall thickness due to the protrusion 7 is bulged toward the blade surface side, and this is used to form the stepped portion 4. (Figures 7 and 8) Finally, as shown in Figure 9, the handle 1 is flattened and finished by hardening, sharpening, polishing, etc., and the center of the handle has an approximately 180 degree U-shape. Fold it into a shape to complete the gripping scissors.

It should be noted that it is convenient to form a stepped portion by adding padding to the neck portion 3a that forms the protrusion 7 on the very mild steel surface as shown in FIG. It can be a small thing.

According to the present invention, the stepped portion formed at the neck (gusset) of the lower blade;
And the neck surface of the upper blade that comes into contact with the stepped part is made of the same blade steel as the blade surface, and the blade steel can be distributed more widely to the side of the stepped part. It is possible to manufacture gripping scissors that will not wear out and cease to function as a stopper.

[Brief explanation of drawings]

The attached drawings are for explaining the method of manufacturing the gripping scissors of the present invention. FIG. 1 is a perspective view of the gripping scissors manufactured by the manufacturing method of the present invention, and FIGS. 2 to 9 show the method of manufacturing the gripping scissors of the present invention. The steps are explained in order of process. Figure 2 is a plan view of the original blade shape, Figure 3 is a plan view of the upper and lower blades separated, and Figure 4 is the welding of the upper and lower blades to the handle. Fig. 5 is a plan view showing the state in which the protrusion on the neck of the lower blade is crushed, Fig. 6 is a sectional view taken along the - line in Fig. 5, and Fig. 7 is a plan view showing the state in which the stepped portion is formed. Fig. 8 is a plan view of the state, Fig. 8 is a cross-sectional view taken along the - line in Fig. 7, Fig. 9 is a plan view of the handle in a flattened state, Fig. 10 is a longitudinal sectional view when the neck is overlaid, and Fig. FIG. 11 is a partially cutaway perspective view of gripping scissors manufactured using a conventional manufacturing method. 1...Handle, 2...Upper blade, 3...
・Lower blade, 2a, 3a... Neck, 4...
Stepped portion, 5...Knife steel, 7...Protrusion, 8
・・・・・・A lot of meat.

Claims (1)

[Claims] 1 Neck part 2 is made of a composite material made of extremely mild steel plate with cutter steel layered on one side.
form an upper blade 2 and a lower blade 3 including a, 3a, the upper blade,
When joining the lower blade to both ends of the handle 1 to be bent into a U-shape and forming the stepped portion 4 to serve as a stopper on the neck 3a of the lower blade 3, at least A protrusion 7 that protrudes inward on the cutting edge side is formed in the composite material portion on which the knife steel is heavily attached, and the protrusion 7 is removed by hammering in the width direction.
A method for producing gripping scissors characterized by crushing the material so that it disappears, and then forging to make the back surface made of extremely mild steel flush with the surface and forming a stepped portion 4 on the blade surface side made of cutter steel.