JPS5913959Y2 - scissors - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of scissors in which one of a pair of blades is integrally fixed to a shaft, and the other is rotatably supported around the shaft, and its purpose is to The key point is that the tightening strength of the pair of blades can be made very easily and constant without requiring any skill, so that it will not loosen even after long-term use.

For scissors, if a pair of blades are pivoted so that they can rotate freely around the shaft, the engagement will be poor, so one blade is stopped from rotating around the shaft, and only the other blade rotates. is preferable.

Therefore, in the past, as shown in Japanese Utility Model Publication No. 52-158981, the shaft hole of one blade body was made into a square hole, and the part inserted into the square hole was made into a square rod, or as shown in Japanese Utility Model Publication No. 51-21433, As shown in Japanese Utility Model Publication No. 44-26391, one blade is rotatably attached to the base of a locking screw, the shaft hole of the other blade is formed as a screw hole, and the tip of the locking screw is inserted into this screw. One idea was to fix the square hole by screwing it into the hole, but in the former case, it was troublesome to form the square hole, and it was difficult to fit the square hole and the square rod without play, and in the latter case, it was difficult to fit the square hole and the square rod without play. Since the shaft hole is a screw hole, the machining process is troublesome and expensive.

This invention does not use any square holes, square rods, screw holes, or IL locking screws, and uses a synthetic resin barrel and plug to extremely easily fix one blade to the barrel and rotate the other blade. It is designed to be freely pivotable and eliminate the drawbacks of the conventional method.

Next, an embodiment of the present invention shown in the accompanying drawings will be described in detail.

Reference numerals 1 and 2 denote a pair of blade bodies each having shaft holes 1a and 2a formed in their intermediate portions, respectively.

3 is a shaft cylinder made of synthetic resin, and there are flanges 3 on both ends on the outside.
a and 3b, and a step is provided at the center of the outer peripheral surface to form the large diameter portion 3.
d and a small diameter portion 3e, a split groove 3C extending from the outer end of the large diameter portion 3d to the vicinity of the step along the axial direction is provided, and a large diameter hole 3b' is provided at the inner peripheral end of the large diameter portion.

The inner diameter of the shaft hole 2a of one blade body 2 is slightly larger than the outer diameter of the small diameter portion 3e, and the inner diameter of the shaft hole 1a of the other blade body 1 is approximately the same as the outer diameter of the large diameter portion 3d.

4 is a plug made of synthetic resin having a size to fit into the shaft cylinder 3, and has a flange 4a at one end having a size substantially equal to the large diameter hole 3b' at the inner peripheral end of the shaft cylinder; The intermediate portion of the outer periphery is provided with an annular protrusion 4b having a shape that fits into the inner groove 3f of the shaft cylinder and presses the inner surface of the fitting time groove 3f.

Next, the assembly method will be explained.

The flange 3b of the shaft cylinder 3 is pressed perpendicularly to the split groove 3C to make it a small diameter, and the shank 3b is sequentially inserted into the shaft hole 2a of the blade body 2 and the shaft hole 1a of the blade body 1 to make the shaft hole 2a a small diameter. The shaft hole 1a is provided in the portion 3e.
is attached to the large diameter portion 1a and the pressure is released.

The inner diameter of the shaft hole 2a is slightly larger than the outer diameter of the small diameter portion 3e, and the blade body 2 is rotatably supported on the small diameter portion 3e.

- The front shaft hole 1a is tightly fitted into the large diameter portion 3d.

Next, when the plug body 4 is inserted into the shaft cylinder 3 from the right opening,
The annular protrusion 4b is press-fitted into the shaft cylinder 3, and at the same time it fits into the groove 3f provided in the shaft cylinder 3, it presses the inner surface of the groove 3f and the collar 4a at one end is inserted into the inner peripheral end of the shaft cylinder 3. When fitted into the diameter hole 3b', the plug body 4 presses the inner surface of the large diameter portion 3d outward, and the large diameter portion 3d is brought into elastic contact with the shaft hole 1a by the split groove 3C.

Note that the flange on the large diameter side of the barrel may be eliminated, or a plurality of protrusions may be used instead of the annular protrusion, and the barrel and plug body may be made of other elastic materials other than synthetic resin. good.

According to the present invention, the barrel and plug body can be easily mass-produced by molding, and the shaft hole of the blade does not need to be a square hole or a screw hole, but can be a simple circular shaft hole. After installing the shaft hole of the blade body, the plug body can be assembled by simply press-fitting it into the shaft cylinder, so manufacturing is extremely simple.Moreover, one blade body can be securely fixed to the shaft cylinder, and the other blade can be fixed securely to the shaft cylinder. The body can be rotatably supported, and the pair of blades can maintain good engagement without loosening even after long-term use.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, and Figure 1 is a plan view;
2 is an enlarged cross-sectional view taken along the line A-A in FIG. 1, FIG. 3 is a perspective view of the barrel, and FIG. 4 is a perspective view of the stopper. 1.2...blade body, la, 2a...shaft hole, 3...shaft cylinder, 3a...tsuba, 3C...
...Split groove, 3d...Large diameter part, 3e...
... Small diameter part, 3f ... Concave groove, 4 ... Plug body, 4a ... Flange, 4b ... Annular protrusion.

Claims (1)

[Scope of utility model registration request] A step is provided in the center of the middle peripheral surface to form a large diameter part and a small diameter part, a flange is provided on the outside of the small diameter part, a groove is formed on the inner surface of the large diameter part, and a groove is formed in the axial direction from the outside end of the large diameter part. The shaft hole of one of the blades, which has a shaft hole with an inner diameter slightly larger than the outer diameter of the small diameter portion, is inserted into the small diameter portion of the shaft cylinder, which has a split groove that reaches near the step. Fit the shaft hole of the other blade, which has a shaft hole with approximately the same inner diameter as the outside diameter of the large diameter part, and fit into the groove on the outer periphery of the plug body, which has an outside diameter that can fit into the shaft tube. The protrusion is shaped to press against the inner surface of the recessed groove when fitted, and the stopper is fitted into the shaft cylinder and the protrusion is fitted into the recessed groove. Scissors in which the blade shaft hole and the large diameter part of the shaft cylinder are firmly fixed.