JPH0461679B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is an improvement regarding scissors, particularly the spindle of the scissors, and relates to all kinds of scissors such as hairdressing scissors and other lash cutting scissors.

(Prior art) Conventional scissors simply use a bolt and nut for the support shaft, and a slight gap is formed between the two scissor blades near the support shaft, and the nut is loosened and tightened. By doing so, the elasticity of the scissor blades was used to adjust the strength and weakness of the rotation of the scissor blades.

(Problem to be solved by the invention) Conventional scissors were as described above, so if they are used for a certain period of time, the contact part of the spindle will wear out and the bolts and nuts may loosen or tighten slightly. However, since Natsuto rotates in the opposite direction,
I had to re-tighten the nut. However, the main purpose of retightening the nut is to adjust the tone of the scissors when opening and closing the scissors, in other words, the degree of hardness felt by the fingers. It was difficult for women.

SUMMARY OF THE INVENTION An object of the present invention is to provide scissors that do not require retightening of nuts.

(Means for Solving the Problems) The configuration of the present invention will be explained with reference to the drawings showing examples.

The scissors have two scissor blades 1 and 2 rotatably attached to a support shaft. The support shaft consists of a bolt 3, a nut 4, and two cylindrical bodies 5 and 6.

The cylindrical body consists of heads 9, 11 and body parts 10, 12, and has insertion holes 16, 17 bored in the axial direction. The heads 9, 11 have tapered side surfaces 18, 19 formed to match the countersinks. Also,
In order to transmit the rotation of one cylinder to the other cylinder,
The halves of the bodies 10 and 12 of each cylinder are split in half and have contact side surfaces 14 and 15 that contact each other. A rectangular protrusion 20 is integrally formed on the head surface of one cylinder 5, and a dish-shaped hole 21 is bored in the head surface of the other cylinder 6.

The shaft holes 13 formed in the two scissor blades are countersinks, and the cylinders 5 and 6 are inserted into the shaft holes 13. The upper part of the cylinder head protrudes beyond the surface of the scissor blade. Elastic members for pressing each cylinder toward the other cylinder are oval leaf springs 22, 2.
It is 3. A square hole 24 and a round hole 25 are bored in the leaf spring. The leaf springs 22 and 23 are fixed through round holes 25 by set screws 26 and 26 at portions closer to the handle than the support shaft. A square protrusion 20 on the top surface of the cylinder 5 is fitted into the square hole 24 of one of the leaf springs 22, and the cylinder 5 is pressed by the elastic force of the leaf spring 22. The other leaf spring 23 simply presses the other cylindrical body 6 from above, and there is no coupling relationship such as fitting. The ends of the body parts 10 and 12 of both cylinders face each other at a distance within the shaft hole 13. Further, since the contact sides of both cylinders are in contact with each other, when one cylinder is rotated, the other cylinder also rotates.

The bolt 3 is inserted from the other cylindrical body 6 and is screwed into the nut 4 on the opposite side. The bolt 3 has a tapered side surface 27 formed on the back surface of the head thereof, which matches the countersunk hole 21 of the cylinder body 6, and further has a square neck portion 28 formed adjacent to the tapered side surface 27. This neck portion 28 and the square hole 24 of the other leaf spring 23 fit together. Due to this fitting, the bolt 3 does not rotate relative to the other scissor blade 2. In addition, the code 7 is Natsu 4.
The coil spring 8 incorporated inside is an elastic washer interposed between the nut 4 and the leaf spring 22.

(Operations and Effects) The present invention has the above configuration, and since one of the cylindrical bodies 5 does not move relative to one of the scissor blades 1, the other cylindrical body 5 is in contact with the other scissor blades 14 and 15. The cylindrical body 6 also rotates in the same manner with respect to the one scissor blade 1. Therefore, when the other scissor blade 2 is rotated, friction is generated between it and the other cylindrical body 6. The strength of this frictional force is determined by the leaf spring 23, which is an elastic member that presses the cylinder 6. The strength of this frictional force determines how well the scissors open and close.

Scissors are made by tightening the two scissor blades with bolts and nuts, but even if the tightening loosens a little, it has little effect on the cutting force. What is most affected by loosening of the scissors is the feel of the scissors when opening and closing them, that is, the stiffness that you feel in your fingers when opening and closing them. If this becomes loose, you will lose the sense of stability when using it, making it difficult to use and even more tiring.

When conventional scissors are used for a long period of time, the spindle becomes loose due to wear of the friction-producing parts of the spindle or due to reverse rotation of the nut, so tighten the nut and adjust the opening and closing of the scissors blade. I needed to make it hard.

In the present invention, even if wear due to friction occurs between the scissor blades 2 and the cylinder 6, it is slight, and the cylinder 6 advances inward by the pressing force of the leaf spring 23 by the amount of wear.
The frictional force between the scissor blade 2 and the cylindrical body 6 is not reduced. Therefore, even if the scissors are used for a long period of time, the frictional force between the scissors blade 2 and the cylinder body 6 does not substantially change, and the stiffness of opening and closing of the scissors is determined by the frictional force. will not change either. That is, the present invention
Since the opening/closing stiffness of the scissors does not change even after long-term use, there is no need for the difficult work of frequently adjusting the tightness of the scissors as in the past.

The present invention is characterized in that the means for tightening the two scissors blades and the means for adjusting the firmness of opening and closing of the scissor blades are separate. With conventional scissors, when the nut loosens, the opening/closing stiffness of the scissor blade also loosens, and most of the reasons for this loosening of the opening/closing stiffness are the loosening of the nut, and wear on the material is almost negligible. Ta. In contrast, the present invention is superior in that the loosening of the nut does not affect the tightness with which the scissor blades open and close.

The reason why the bolt 3 is fixed so as not to rotate relative to the other scissor blade 2 is because the bolt 3 does not rotate when the nut 4 is first tightened.

Furthermore, what tightens the two scissors are bolts, nuts, and elastic washers, and even if the nuts loosen a little and the scissors become less tightly tightened, it will only be a slight change in the cutting ability. There isn't.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention.
2 is a perspective view of the leaf spring, FIG. 3 is an enlarged sectional view of the vicinity of the support shaft, and FIG. 4 is a perspective view of the cylindrical body. 1, 2... Scissor body, 5, 6... Cylindrical body, 13... Shaft hole, 14, 15... Contact side surface, 22, 23... Leaf spring.

Claims (1)

[Claims] 1. A pair of scissors in which two scissors are rotatably mounted on a spindle, the spindle consisting of a bolt, a nut, and two cylinders, and the cylinder consisting of a head and a body,
The surface of the scissor blade is inserted into the shaft hole drilled in the scissor blade, and the insertion amount of the cylinder is regulated by the head so that the ends of both cylinders do not butt each other in the shaft hole. , and in order to transmit the rotation of one of the cylinders to the other cylinder, the bodies of both cylinders have a contact side surface, and each cylinder is pressed against each other toward the other cylinder by an elastic member, The two scissor blades are joined together using bolts and nuts inserted into insertion holes drilled in the cylinder so that they do not separate, and the cylinder inserted into the shaft hole of one of the scissors is positioned relative to that scissor blade. The bolts and nuts inserted through the insertion holes of the cylindrical body must be fixed so that they do not rotate relative to the other scissors, and must be equipped with a fixing means to prevent them from rotating relative to the other scissors. Scissors featuring: