CN112469541B

CN112469541B - Hairdressing scissors

Info

Publication number: CN112469541B
Application number: CN201980041603.7A
Authority: CN
Inventors: 足立荣美
Original assignee: Adachi Kogyo Inc
Current assignee: Adachi Kogyo Inc
Priority date: 2018-08-02
Filing date: 2019-08-01
Publication date: 2022-08-23
Anticipated expiration: 2039-08-01
Also published as: JP2020022721A; JP6582115B1; CN112469541A; WO2020027245A1

Abstract

Provided is a pair of hair scissors with which a large cutting force can be generated between two blade bodies. The hair scissors 1 have a first scissor member 2, a second scissor member 3, a shaft member 4 and a connecting member 5. The first scissor member 2 and the second scissor member 3 are rotatably connected by the shaft member 4 at a first connection point C1. The shank portion 22 of the first scissor member 2 is comprised of a first portion 221 extending from the blade body portion 21 and a second portion 222 extending from the ring portion 23. One end of the connecting member 5 is rotatably connected to the second portion 222 at a second connection point C2. The other end of the connecting member 5 is rotatably connected to the shank 32 of the second scissor member 3 at a third connection point C3. The first part 221 is rotatably connected to the second part 222 at a fourth connection point C4 located between the second connection point C2 and the loop portion 23.

Description

Hairdressing scissors

Technical Field

The present invention relates to hairdressing scissors.

Background

Hair scissors including a first scissor member, a second scissor member, and a shaft member are known (see patent document 1). The first and second scissor members each include a blade portion, a handle portion, and a ring portion. The first and second scissor members are rotatably connected by a shaft member at a location between the cutter body and the handle.

Reference list

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-146854

Disclosure of Invention

Problems to be solved by the invention

Incidentally, since the hair scissors are often opened and closed, the user's wrist is easily stressed. In particular, the cutter body portion of hair scissors for trimming pet hair (such as cat or dog hair) is longer than the cutter body portion of hair scissors for humans, which causes more stress on the wrists of the user. Therefore, in order to reduce the pressure on the wrist of the user as much as possible, there is a need for hair scissors that can generate a large shearing force with a small operating force.

The invention aims to provide hairdressing scissors capable of generating large shearing force between the scissors bodies.

Means for solving the problems

The hair scissors according to the present invention comprises:

a first scissor member comprising a blade portion, a handle portion and a ring portion, the handle portion being comprised of a first portion extending from the blade portion and a second portion extending from the ring portion;

and a second scissor member comprising a blade portion, a handle portion and a ring portion, the blade portion, the handle portion and the ring portion being integrally formed.

A shaft member rotatably connecting the first and second scissor members at a first connection point between the blade portion and the first portion of the first scissor member and between the blade portion and the handle portion of the second scissor member; and

the connecting component is connected with the connecting component,

wherein:

one end of the connecting member is rotatably connected to the second part at a second connecting point, and the other end of the connecting member is rotatably connected to the shank of the second scissor member at a third connecting point,

the first part is rotatably connected to the second part at a fourth connection point between the second connection point and the loop, an

From a state in which the blade portions of the first and second scissor members are closed to a fully open state, the second connection point is closer to the first connection point than the third and fourth connection points.

The hair scissors according to the present invention comprises:

a first scissor member comprising a blade portion, a handle portion, and a ring portion;

a second scissor member comprising a blade portion, a handle portion and a ring portion, the blade portion, the handle portion and the ring portion being integrally formed; and

four pivots including a pivot connecting the first scissor member and the second scissor member.

Hair scissors according to the present invention include scissors for cutting animal hair (hair of pets such as cats or dogs) in addition to scissors for cutting human hair. Hair scissors according to the present invention are, for example, thin hair scissors (thining shears).

Effects of the invention

With the hair scissors according to the present invention, when the first scissor members are closed, the ring portion of the first scissor members is the point of application of force, the second connection point is the fulcrum, and the fourth connection point (the first portion of the shank portion of the first scissor members) is the point of application of force. According to the principle of a lever, a force greater than the force applied to the loop portion can be generated at the fourth connection point. According to the principle of the lever in which the first connecting point is a fulcrum and the cutter body portion of the first scissor member is a point of effort, the force acting on the fourth connecting point generates a force acting on the cutter body portion of the first scissor member that is greater than the force acting on the cutter body portion of the conventional hair scissors. This makes it possible to enhance the shearing force of the hair scissors.

When the second scissor member is closed, the loop portion of the second scissor member is the point of application of the force, the second connection point is the fulcrum, and the third connection point (the shank portion of the second scissor member) is the point of application of the force. According to the principle of the lever, a force greater than the force applied to the loop portion can be generated at the third connection point. According to the principle of the lever in which the first connecting point is a fulcrum and the cutter body portion of the second scissors member is a point of force, the force acting on the third connecting point generates a force acting on the cutter body portion of the second scissors member, which is larger than the force acting on the cutter body portion of the conventional hair scissors. This makes it possible to enhance the shearing force of the hair scissors.

Drawings

Fig. 1 is a plan view showing hair scissors in a closed state in (a), and a plan view showing hair scissors in an open state in (b);

fig. 2 is a plan view showing the operation of the hair scissors when the second scissor members are kept stationary while only the first scissor members are moved;

fig. 3 is a plan view showing the operation of the hair scissors when both the first scissor member and the second scissor member are moved; and

fig. 4 is a plan view of hair scissors having a different configuration from those of hair scissors according to the present invention.

Detailed Description

The present invention is described with reference to the accompanying drawings. Each of the embodiments described below shows a preferred specific example of the present invention. The present invention is not limited to the following embodiments, and may be modified as appropriate without departing from the spirit and scope of the invention.

Fig. 1(a) is a plan view of hair scissors 1 in a closed state. Fig. 1(b) is a plan view of hair scissors 1 in an open state.

The hair scissors 1 include a first scissor member 2, a second scissor member 3, a shaft member 4, and a connecting member 5.

The first scissor member 2 includes a blade portion 21, a handle portion 22, and a ring portion 23. The ring portion 23 is where a finger (typically a thumb) is to be inserted.

The second scissor member 3 includes a blade portion 31, a handle portion 32, a ring portion 33, and a finger rest 34. The blade portion 31, the shank portion 32, the ring portion 33, and the finger rest 34 are formed integrally. The ring portion 33 is where a finger (typically a ring finger) is to be inserted.

The first and

second scissor members

2, 3 are rotatably connected by the shaft member 4 at a location between the

blade portions

21, 31 and the

handle portions

22, 32. Hereinafter, the point at which the first scissor member 2 and the second scissor member 3 are connected by the shaft member 4 is referred to as "first connection point C1".

The handle 22 of the first scissor member 2 is comprised of a first portion 221 and a second portion 222, the second portion 222 being comprised of a separate member from the first portion 221. The first portion 221 is formed integrally with the cutter body portion 21 and extends from the cutter body portion 21 toward the ring portion 23. There is a gap between the first portion 221 and the shank 32. The second portion 222 is formed integrally with the ring portion 23, and extends from the ring portion 23 toward the blade portion 21. An end of the second portion 222 is located in the gap between the first portion 221 and the shank 32. When the hair scissors 1 are in the closed state shown in fig. 1(a), the end of the second portion 222 is located on the center line O passing through the center of the shaft member 4.

One end portion of the connecting member 5 is rotatably connected to the end portion of the second portion 222 via the shaft member 6. Hereinafter, a point at which the end of the connecting member 5 and the end of the second portion 222 are connected is referred to as "second connection point C2". When the hair scissors 1 are in the closed state as shown in fig. 1(a), the second connecting point C2 is located on the center line O. The other end portion of the connecting member 5 is rotatably connected to an approximately central position of the shank portion 32 of the second scissor member 3 via the shaft member 7. Hereinafter, a point at which the other end portion of the link member 5 is connected to the handle 32 is referred to as "third connection point C3". The third connection point C3 is closer to the loop portion 33 than the second connection point C2.

One end portion of the first portion 221 is rotatably connected to the second portion 222 by the shaft member 8 at a position between the ring portion 23 and the second connection point C2. Hereinafter, a point at which the end of the first portion 221 and the second portion 222 are connected is referred to as "fourth connection point C4". The fourth connection point C4 is located approximately midway between the loop portion 23 and the second connection point C2.

As shown in fig. 1(a), the third connection point C3 and the fourth connection point C4 are both located on the same circumference of a circle centered on the second connection point C2. In other words, the distance L1 between the second connection point C2 and the fourth connection point C4 is approximately equal to the distance L2 (i.e., the length of the connection member 5) between the second connection point C2 and the third connection point C3.

For the

shaft members

4, 6, 7, and 8, a combination of a nut and a bolt or a rivet, for example, may be used.

When the hair scissors 1 are operated to open the first scissor members 2 and the second scissor members 3 from the state shown in fig. 1(a), each of the parts connected at the first connection point C1, the second connection point C2, the third connection point C3, and the fourth connection point C4 rotates. This brings the hair scissors 1 into the open state shown in fig. 1 (b).

Next, the operation and effect of the hair scissors 1 will be described with reference to fig. 2 and 3. In fig. 2 and 3, the force F acting on the hair scissors 1 is schematically shown by an arrow. The direction of the arrow indicating the force F in fig. 2 and 3 does not necessarily exactly indicate the direction in which the force F acts. In addition, the length of the arrow indicating the force F in fig. 2 and 3 does not necessarily indicate the magnitude of the force F precisely.

First, with reference to fig. 2, a case will be described in which the second scissor member 3 is not moved and only the first scissor member 2 is closed. In this case, the first scissor member 2 is a movable blade and the second scissor member 3 is a stationary blade. Fig. 2 shows a case where the user moves the ring portion 23 closer to the ring portion 33 from a state where the ring portion 23 and the ring portion 33 are separated from each other (in other words, a state where the cutter body portion 21 and the cutter body portion 31 are opened).

In fig. 2, a force F1 acts on the ring portion 23. The loop portion 23 is the point of application of force, the second connection point C2 is the fulcrum, and the fourth connection point C4 is the point of application of force. According to the principle of a lever, a force greater than the force F1 applied to the loop portion 23 will act at the fourth connection point C4 (in other words, the end of the first part 221). The force F2 acting at the fourth connecting point C4 is inversely proportional to the arm length r1 (the length of a vertical line drawn from the second connecting point C2 as a fulcrum to the line of action of the force F2). In other words, the shorter the arm length r1, the greater the force F2. The arm length r1 is proportional to the distance L1 between the second connection point C2 and the fourth connection point C4. In other words, the shorter the distance L1, the shorter the arm length r 1. Therefore, the force F2 is inversely proportional to the distance L1, and the force F2 becomes larger as the distance L1 becomes shorter.

According to the principle of the lever in which the first connecting point C1 is a fulcrum and the blade body portion 21 is a point of application of force, the force F2 acting on the fourth connecting point C4 generates a force F3 acting on the blade body portion 21, which is larger than the force acting on the blade body portion of the conventional hair scissors. Therefore, according to the hair scissors 1 of the present invention, the shearing force acting between the blade body portion 21 and the blade body portion 31 is larger than that acting on the conventional hair scissors.

Hair scissors 1A shown in fig. 4 are compared with said hair scissors 1 to describe further advantages of hair scissors 1. Fig. 4 is a plan view of hair scissors 1A having a different configuration from hair scissors 1. In the following, the same components of the hair scissors 1A as those of the hair scissors 1 are given the same reference numerals, and the description thereof is omitted.

In hair scissors 1A shown in fig. 4, a handle portion 32 of the second scissors member 3 is divided into two portions. In other words, the handle 32 is composed of a first portion 321 and a second portion 322, the second portion 322 being composed of a member separate from the first portion 321. The first portion 321 is formed integrally with the cutter body portion 31 and extends from the cutter body portion 31 toward the ring portion 33. The second portion 322 is formed integrally with the loop 33 and extends linearly from the loop 33, then bends as it changes direction, and then extends linearly toward the second portion 222 of the first scissor member 2. In the hair scissors 1A, the connecting member 5 is not provided. One end of the first portion 321 is rotatably connected to a bent portion located approximately in the middle of the second portion 322 by a shaft member 7. One end of the second portion 322 is rotatably connected to said end of the second portion 222 of the first scissor member 2 via the shaft member 6.

In hair scissors 1A shown in fig. 4, a first portion 321 and a second portion 322 are rotatably connected. Therefore, even in the case where only the ring portion 23 of the first scissor member 2 is moved without moving the ring portion 33 of the second scissor member, the blade body portion 31 will move with the rotation of the blade body portion 21 and the shaft member 4. Therefore, the positions at which the blade body portion 21 and the blade body portion 31 sandwich hair differ each time the hair scissors 1A are opened or closed. In contrast, in the hair scissors 1 according to the present invention, the blade portion 31, the handle portion 32, and the ring portion 33 of the second scissors member 3 are formed integrally, and therefore, in the case where only the ring portion 23 of the first scissors member 2 is moved without moving the ring portion 33 of the second scissors member, only the first scissors member 2 is moved, and the second scissors member 3 is not moved. Therefore, even if the hair scissors 1 are repeatedly opened and closed, the positions at which the blade body portion 21 and the blade body portion 31 sandwich hair are not substantially different. This facilitates cutting of the hair.

Next, with reference to fig. 3, a case where both the first scissor member 2 and the second scissor member 3 are closed will be described. Fig. 3 illustrates a case where the ring portion 23 and the ring portion 33 are moved toward each other by a user from a state where the ring portion 23 and the ring portion 33 are separated from each other. Since the operation of the first scissor member 2 has been described above, a description of the operation of the first scissor member 2 will be omitted.

In fig. 3, a force F4 acts on the ring portion 33. The loop 33 is the point of application of force, the second connection point C2 is the fulcrum, and the third connection point C3 is the point of application of force. According to the principle of a lever, a force F5 greater than the force F4 applied to the loop 33 will act at the third connection point C3 (in other words, the handle portion 32 of the second scissor member 3). The force F5 acting at the third connecting point C3 is inversely proportional to the arm length r2 (the length of a vertical line drawn from the second connecting point C2 as a fulcrum to the line of action of the force F5). In other words, the shorter the arm length r2, the greater the force F5. The arm length r2 is proportional to the length L2 of the connecting member 5. In other words, the shorter the length L2, the shorter the arm length r 2. Thus, force F5 is inversely proportional to length L2, and force F5 becomes greater as length L2 becomes shorter.

According to the principle of the lever in which the first connecting point C1 is a fulcrum and the blade body 31 is a point of application, the force F5 acting on the third connecting point C3 generates a force F6 acting on the blade body 31, which is larger than the force acting on the blade body of the conventional hair scissors. As described above, the force F3 also acts on the blade portion 21. Therefore, with the hair scissors 1 according to the present invention, the shearing force acting between the blade body portion 21 and the cutter body portion 31 can be made larger than that of the conventional hair scissors due to the force F3 acting on the blade body portion 21 and the force F6 acting on the blade body portion 31.

Description of reference numerals

1 hairdressing scissors 2 first scissors component

21 cutter body part

22 handle

221 first part

222 second part

23 ring part

3 second scissor parts

31 cutter body part

32 handle part

33 ring part

4-shaft member

5 connecting member

6 shaft member

7-shaft member

8-shaft member

C1 first connection point (fulcrum)

C2 second connecting point (fulcrum)

C3 third connecting point (fulcrum)

C4 fourth point of attachment (fulcrum).

Claims

1. Hairdressing scissors, comprising:

a second scissor member comprising a blade portion, a handle portion and a ring portion, the blade portion, the handle portion and the ring portion being integrally formed;

a shaft member rotatably connecting the first and second scissor members at first connection points between the blade portion and the first portion of the first scissor member and between the blade portion and the handle portion of the second scissor member; and

the connecting component is connected with the connecting component,

wherein:

From the state in which the blade portions of the first scissor member and the second scissor member are closed to the fully open state, the second connection point is closer to the first connection point than the third connection point and the fourth connection point.

2. The hair scissors of claim 1, wherein the loop portions of the first scissors member and the second scissors member are each for finger insertion.

3. The hair scissors of claim 1 or 2, wherein the second portion is formed integrally with the loop portion of the first scissors member and extends substantially linearly from the loop portion of the first scissors member.

4. Hair scissors according to claim 3, characterized in that one end of the second portion is located in the gap between the first portion and the shank of the second scissors member; the end of the second portion is located on a center line passing through the center of the shaft member when the hair scissors are in the closed state.