JPH10156064A - Scissors and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a higher cutting quality of scissors by accomplishing a smooth and stable relative rotary action between a pair of scissors pieces to make a pair of blade bodies properly rub each other. SOLUTION: The scissors of this invention include a pair of scissors pieces 4 and 4A having a pair of blade bodies 1 and 1A formed by pressing work of a metal plate and a link part 3 adapted to make the pair of scissors pieces 4 and 4A relatively rotatable. In this case, a recessed part is formed in a shape of a flange on each of the pair of blade bodies 1 and 1A by pressing in such a manner that outer periphery parts 14A of base end parts 10 of blade bodies are linked together across the width of each blade body while the outer periphery parts 14A of the base end parts 10 are so arranged to slide mutually facing when the pair of scissors 4 and 4A relatively turn centered on the link part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for enhancing the sharpness of a so-called Western scissors type scissors formed by connecting a pair of scissors pieces so as to be relatively rotatable.

[0002]

2. Description of the Related Art Conventionally, as an example of scissors, Japanese Utility Model No. 5
Japanese Unexamined Patent Publication No. -80470. As shown in FIG. 17 of the present application, this conventional scissors has a blade body 1E of a pair of scissors pieces 4B and 4C connected so as to be relatively rotatable.
Is formed by pressing a thin metal plate. Each handle 2E is made of synthetic resin, and each of the blades 1E
Is connected to the base end 19. Thus, each blade 1
If E is formed by pressing a thin metal plate, the manufacturing cost can be reduced and the weight can be reduced. Further, since the handle 2E is formed by resin molding, the manufacturing cost can be reduced and the weight can be reduced, and the weight distribution between the hand side and the blade tip side can be achieved by the combination of the lightweight blade 1E and the handle 2E. It is possible to make the scissors balanced, and to improve the usability.

On the other hand, in the above-described scissors, a bolt and a nut are generally used as means for connecting the pair of scissors pieces 4B and 4C so as to be relatively rotatable. Specifically, as a means for connecting the pair of scissors pieces 4B and 4C to each other, for example, a means as shown in FIG. 3 of Japanese Utility Model Registration No. 3018865 is applied. As shown in FIG. 19 of the present application, this means inserts a bolt 91 from one direction into a pair of scissors pieces 4B and 4C formed by connecting a blade 1E and a handle 2E, respectively. This is means for screwing a nut 92 to one end and tightening it. According to such a means, the assembling work of the pair of scissors pieces 4B, 4C can be relatively easily performed, and the blades of the blade bodies 1E, 1E can be connected by changing the tightening degree of the bolt 91 and the nut 92. Can be arbitrarily adjusted.

[0004]

However, the above-mentioned conventional scissors have the following disadvantages.

More specifically, in the conventional scissors blade 1E, as shown in FIG. 18, a blade (small blade or inner blade) 75 is provided on one side edge of the blade body 1E, and the other side edge is thin. This is only a configuration in which a wide reinforcing rib 76 is provided, and the base end 1 of the blade body 1E
9 has a lower height than the reinforcing ribs 76 and the blades 75. Then, as shown in FIG. 17, in a state where the pair of scissors pieces 4B and 4C are combined, the base ends 19 and 1 of the pair of blade bodies 1E and 1E, respectively.
9, the blade 75 and the reinforcing ribs 76 are configured to merely slide with each other. In such a structure, when the handle bodies 2E, 2E are operated in the direction of the arrow Na to variously change the leg opening angle α1 of the blade bodies 1E, 1E, the blades 75 and the reinforcement at the base end portions 19, 19 are strengthened. The contact states of the ribs 76 are not stable, and these contact states change variously with the change of the leg opening angle α1. Therefore,
Conventionally, each base end 1 of the blade bodies 1E, 1E
Due to the unstable sliding operation between the blades 9 and 19, the rubbing operation between the blades 75 on the distal end side of each blade body 1E is also unstable, resulting in a problem of poor sharpness. Such inconvenience becomes more serious in the case of cloth cutting scissors, which require better sharpness than paper cutting scissors.

Conventionally, as described with reference to FIG. 19, a pair of scissors pieces 4B and 4C are merely connected by bolts and nuts 91 and 92, and the bolts and nuts 91 and 92 are used when scissors are used. 92 is likely to be loose. Such loosening of the bolts and nuts may cause deterioration of the degree of rubbing between the blade bodies 1E, 1E. Therefore, in the related art, the sharpness of scissors has been deteriorated due to such a thing. In addition, conventionally, different from the above, various structures having a structure in which a bolt and a nut for connecting a pair of scissors pieces are prevented from loosening have been proposed. The size near the tightening portion of the nut, especially the thickness in the thickness direction of the scissors, has become large, causing problems such as impairing the appearance of the scissors.

Further, in the above scissors, the blade body 1E,
In order to stabilize the rubbing condition of 1E and enhance its sharpness, the pair of scissors pieces 4B and 4C need to be relatively rotated about the bolt 91 as parallel as possible. This is because if the pair of scissors pieces 4B and 4C oscillate in the thickness direction during relative rotation, proper rubbing cannot be performed. However, in the above-mentioned conventional scissors, a bolt 91 and a through hole 93 through which the bolt 91 is inserted are provided.
Inevitably, a certain gap or play is inevitably generated between the bolt 91 and the scissor pieces 4B, 4B.
C is rattled. For this reason, in the related art, it has been difficult to accurately perform the relative rotation operation of the pair of scissors pieces 4B and 4C in parallel with each other. Due to such a situation, the sharpness of the scissors deteriorates. That was the problem.

The present invention has been devised in view of such circumstances, and enables a pair of scissors to be smoothly and stably rotated relative to each other so that a pair of blades can be appropriately connected to each other. An object of the present invention is to make the scissors have good sharpness.

[0009]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

That is, according to the first aspect of the present invention, scissors are provided. The scissors include a pair of scissors pieces having a pair of blades formed by pressing a metal plate, and a connecting portion that connects the pair of scissors pieces so as to be relatively rotatable. In each of the pair of blades, a concave portion that forms an outer peripheral edge of a base end of each of these blades in a flange shape connected in a width direction of each blade is formed by press working, The outer peripheral edge of the base end is characterized in that the pair of scissors pieces are configured to slide face-to-face with each other when the pair of scissors pieces rotate relative to each other about the connection section.

According to a second aspect of the present invention, the above-mentioned first aspect is provided.
A method for producing scissors for producing the scissors provided by the aspects of the present invention is provided. The manufacturing method of this scissors
A pair of scissors pieces having a pair of blades formed by pressing a metal plate, and a scissors for manufacturing scissors including a connecting portion that connects the pair of scissors pieces to be rotatable relative to each other. In the manufacturing method, when each of the pair of blades is formed by press working, a concave portion that forms an outer peripheral edge of a base end portion of each blade in a flange shape connected in a width direction of each blade. Is formed by press working.

In the present invention, a flange-shaped outer peripheral edge which slides on each other when the pair of scissors are relatively rotated about the connecting portion is provided at the base end of each blade of the pair of scissors. A part is formed. Therefore, when the pair of scissors are rotated relative to each other, it is possible to regulate the rubbing operation between the blades so as not to be non-uniform due to the guiding action by the facing sliding of the outer peripheral edges of the base end. Becomes In other words, by sliding the outer peripheral edge portions of the base end portion in parallel face-to-face sliding, the tip end side of the blade body can also be relatively rotated in parallel, and it is possible to suppress deflection in the thickness direction of the blade body. Becomes In particular, since the outer peripheral edge of the base end portion is formed in a shape connected in the width direction of each blade body, even if the relative rotation angle of the pair of scissors pieces is The two outer peripheral edges can be smoothly and stably face-to-face slidable. As a result, in the present invention, an excellent effect is obtained in that the degree of rubbing between the blade bodies can be maintained in an appropriate state, and the sharpness of scissors can be improved.

Moreover, in the present invention, the flange-shaped outer peripheral edge at the base end of each blade is formed by press-forming a concave portion on each blade. Therefore, as means for forming the flange-shaped outer peripheral edge of the base end, for example, it is possible to eliminate or reduce the need to grind each blade body by a complicated processing operation,
The manufacturing cost of the blade can be reduced.

In a preferred embodiment of the present invention, the outer peripheral edge of the base end portion is formed in an arc shape having a predetermined width around a center of relative rotation of the pair of scissors pieces or a point near the center. Configuration.

According to such a configuration, when the pair of scissors are relatively rotated, the outer peripheral edge of the base end formed in a circular arc having a predetermined width centered on the center of rotation or the vicinity thereof. The parts slide face-to-face so as to follow the arc-shaped direction of the outer peripheral edge itself or to draw a locus close thereto. Therefore, the face-to-face sliding operation between the outer peripheral edges of the base end portion can be made smoother and more stable, and it is possible to make the scissors sharper more conveniently.

In another preferred embodiment of the present invention,
The concave portion is a first side surface portion on the inner blade side of the blade body.
The blade body may be configured to extend from the base end portion to the tip end side so as to depress an inner region excluding the entire outer peripheral portion.

According to such a configuration, the first side surface portion of the blade body on the inner blade side has a shape depressed by press working over substantially the entire length thereof, and the first side surface portion of the blade body is depressed. It is possible to eliminate the necessity of performing a cutting process for forming a shape. That is, in order to improve the sharpness of the scissors, it is possible to provide a configuration in which each of the side surfaces of the blade body that rub against each other is provided with a depression, so that only the blade edge portions of the blade body substantially rub against each other. Desirably, according to the above configuration, since the concave portion forming the depression is formed in advance by press working over substantially the entire length region of the blade body, there is no need to perform cutting work afterwards. Further, since the concave portion is provided in a region other than the entire outer peripheral edge of the blade body, the entire outer peripheral edge of the blade body can be formed in a flange shape, and a part thereof is used as a cutting blade. It is also convenient to form as. Further, if the blade body is formed to have a recess over substantially the entire length of one side surface of the blade body, the strength of the blade body can be increased. Therefore, sufficient blade strength can be obtained even if the metal plate as a raw material of the blade is made thin.

In another preferred embodiment of the present invention,
The concave portion may be formed on the second side surface of the outer blade side of the blade body so as to provide an inclined surface that reduces the thickness of the blade body toward the abdomen of the blade body. .

According to such a configuration, the use of the scissors can be improved as described below due to the existence of the inclined surface on the outer cutter side. That is, for example, when cutting a cloth or the like, the cut cloth is placed on the second blade on the outer blade side of the blade body.
Although it comes into contact with the side surface, in this case, it is possible to move the cloth smoothly along the slope of the inclined surface and reduce the possibility of the blade body and the cut cloth being caught. In the above configuration, since the inclined surface having such a function is simultaneously formed by pressing the concave portion, the above-described function is employed without employing a complicated means such as performing a cutting process on the blade body. You can get
The manufacturing cost of scissors can be further reduced.

In another preferred embodiment of the present invention,
Each of the blades may be partially quenched, and the quenched region may be at least a blade forming portion and an outer peripheral edge of the base end. it can.

According to such a configuration, the hardness of each of the portion where the blade of the blade body is formed and the outer peripheral edge of the base end can be increased. Therefore, the sharpness of the blade can be improved, and the abrasion due to the face-to-face contact of the outer peripheral edge of the base end can be reduced. On the other hand, the above-mentioned quenching treatment is considered only for a part of the blade body, and the other parts of the blade body have the characteristics inherent to the material of the blade body, for example, the ease of plastic deformation processing as it is. Let it be. When manufacturing scissors, it is common to adjust the degree of curvature (degree of curvature) of the blade body of the scissors near the final process. In such a case, a hardening treatment is performed on the entire blade body. If it is applied, it becomes difficult to appropriately plastically deform the entire blade body, and it becomes difficult to adjust the degree of warpage of the blade body. In contrast,
According to the above configuration, there is obtained an advantage that the degree of warpage of the blade body can be easily and appropriately adjusted without causing such a problem.

In another preferred embodiment of the present invention,
A structure in which a handle made of synthetic resin is attached to each of the pair of blades may be employed.

According to such a configuration, since the handle attached to the blade is made of synthetic resin, the manufacture of the handle becomes easy, and the manufacturing cost of scissors can be further reduced. In addition, since the handle can be reduced in weight, the weight balance between the reduced weight of the handle and the blade manufactured to be lightweight by pressing can be balanced. The usability of scissors can be improved.

According to a third aspect of the present invention, the above-mentioned first aspect is provided.
And a scissor having a different configuration from the scissors provided by the aspect of the present invention. The scissors are scissors in which a pair of scissors are connected to each other via a connecting portion so as to be relatively rotatable, and the connecting portion is provided at a fulcrum provided on one of the pair of scissors. A cylindrical nut fixedly attached to the one scissor piece by being inserted into the hole; a cylindrical portion provided on the other scissor piece of the pair of scissors pieces; a bolt and a nut for tightening And the cylindrical portion is externally slidably and rotatably fitted to the cylindrical nut, and the bolt is provided inside each of the cylindrical portion and the cylindrical nut. It is characterized in that it is inserted in a series and screwed into the cylindrical nut, and the cylindrical portion and the cylindrical nut are fastened by the bolts and nuts in their axial direction.

In the present invention, basically, a pair of scissors pieces are tightened and connected by bolts and nuts. However, the above-mentioned bolts are also attached to a cylindrical nut fixedly attached to one scissors piece. It is screwed. That is, the bolt is screwed into two nuts, a nut and a cylindrical nut. Therefore, when the bolt is tightened, the bolt is prevented from loosening by the so-called double nut tightening action of the two nuts. Therefore, it is possible to eliminate the problem that the sharpness of the scissors is reduced due to the loosening of the bolt.

Further, as an important effect, according to the present invention, since the cylindrical nut of one scissor piece is slidably and rotatably fitted on the cylindrical portion of the other scissor piece,
The sliding rotation of the cylindrical nut and the cylindrical portion can also regulate the relative rotation of the pair of scissors. That is, the sliding rotation of the cylindrical nut and the cylindrical portion can regulate the pair of blades so as to relatively rotate in parallel with each other. Therefore, the degree of rubbing between the blade bodies can be stabilized, and the sharpness of the scissors can be enhanced.

The connecting portion is provided with a cylindrical nut and a cylindrical portion. The cylindrical nut and the cylindrical portion are fitted to each other so that these cylindrical nuts and the cylindrical portion are in the width direction of the scissors. It is also possible to eliminate a bulky shape as it is. Therefore, the connecting portion can be formed in a relatively small size.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

In this embodiment, an example of a method of manufacturing the scissors according to the present invention will be described first for convenience of explanation.
The method for manufacturing scissors according to the present embodiment is a method for manufacturing scissors in which a synthetic resin handle is connected to a metal blade, and the blade is manufactured as follows.

First, as shown in FIG. 1, a thin primary metal plate 9 serving as a raw material of a blade is used to form a secondary metal having a size required for manufacturing a single blade called a blank. The work 1a as an intermediate product of the blade body is formed from the metal plate 90. The work 1a is formed by press forming using a die and punching. As the metal plate 9, for example, carbon steel, carbon tool steel, or alloy tool steel having a thickness of about 1.5 mm is used.

As shown in FIG. 2, the work 1a has an elongated shape that becomes narrower in width from the base end portion 10 toward the tip end portion 11 when viewed from the front. A concave portion 13 is provided on one side surface portion 12.
The concave portion 13 is formed by the above-described press working, and extends from the base end 10 to the distal end 1 of the work 1a.
It is provided over substantially the entire length area up to one side. However, the concave portion 13 is provided so as to exclude the entire outer peripheral edge portion 14 of the work 1a. For this reason, III-II in FIG.
In the section I, as shown in FIG.
Has a flange shape having a predetermined width with respect to the region where the concave portion 13 is formed.

[0032] Such a configuration is similar to that of the base 1 of the work 1a.
0, and in the section taken along the line IV-IV in FIG. 2, as shown in FIG.
4A is also formed in a flange shape having a predetermined width with respect to the region where the concave portion 13 is formed. However, this base end 10
As shown in FIG. 2, the outer peripheral portion 14A is formed in an arc shape having a predetermined radius R and a constant width continuously connected in the width direction of the work 1a.

As shown in FIG. 3, the first side surface portion 1 is provided on the second side surface portion 17 of the work 1a on the outer blade side of the blade body.
The inclined surface 15 is formed by press-forming the concave portion 13 in FIG. This inclined surface 15 is used for the work 1a.
The work 1a is inclined such that the thickness t of the work 1a becomes thinner as it goes from the center in the width direction to the side edge 18 of the work 1a. Further, as shown in FIG. 5, the work 1a is entirely curved in a side view shape, and a longitudinal intermediate portion of the work 1a is slightly concave with respect to a straight line connecting the base end portion 10 and the tip end portion 11. It is warped so that This warpage is useful for improving the degree of rubbing between the blade bodies formed of the work 1a. Such warpage of the work 1a can also be performed at the time of the press working. However, the manufacturing method of the blade body is not limited to this, and for example, the blade body may be applied by another processing step using a hammer. Further, the work 1a may be warped on the blade body near the last step of scissors manufacturing without performing the warp processing.

Next, after forming the work 1a by press working, as shown in FIG.
The supporting end hole 6 and two screw holes 60, 60 are provided in the base end portion 10 of FIG. The fulcrum hole 6 is a hole serving as a center of the pivoting operation of the scissors. The screw holes 60, 60
This hole is used to connect a synthetic resin handle 2, 2A described later to the blade after finishing a as a blade. The pilot holes of the screw holes 60, 60 and the fulcrum hole 6 can be formed by press working, and the tapping of the screw holes 60, 60 may be performed after the press working is completed.

After the above operation, as shown in FIG. 7, the work 1a is subjected to a hardening treatment. This quenching process
For example, induction hardening is performed on a part of the outer peripheral edge portion 14 of the work 1a. More specifically, the portion shown by cross hatching in the figure is a portion to be subjected to quenching processing, and the tip portion 11 serving as a cutting edge of the blade body, one side edge of the work 1a serving as a small blade of the blade body and an inner blade 18 and proximal end 1
A quenching process is performed on each area of the outer peripheral portion 14A of the “0”. Of course, when actually performing the quenching process, the quenching process may be performed on an area slightly wider than the above area. The quenching process is not performed on the regions other than the above-described portions among the portions of the work 1a. For this reason, in combination with the fact that the work 1a is formed of a thin metal plate, it is possible to easily perform plastic deformation processing thereafter, and for example, it is possible to easily adjust the warpage.

After the quenching process has been completed, the blades required for the work 1a are polished to obtain the workpiece shown in FIG.
As shown in (b), the work 1a is finished as the blade body 1. There are two types of blade polishing operations: inner blade polishing and small blade polishing. In the inner blade polishing, the surface of the outer peripheral portion 14 of the first side surface portion 12 of the work 1a is polished by, for example, an automatic polishing machine. Is finished as the inner blade 7. At the time of this inner blade polishing, it is preferable that the outer peripheral edge portion 14A of the base end portion 10 is also polished at the same time, and the surface thereof is finished in a smoother state.
The inner edge polishing is performed by removing the outer peripheral edge portion 14 of a narrow region extending like a band.
It is only necessary to polish only the entire surface of the first side surface portion 12 of the work 1a. Therefore, the polishing operation is easy. On the other hand, the small blade polishing operation is an operation of polishing one side edge portion 18 of the second side surface portion 17 of the work 1a and forming the small blade 70 in this portion. When manufacturing the blade body 1,
Along with the above-mentioned polishing operation, an operation of forming a relatively sharp tip at the tip end of the blade body 1 is also appropriately performed.

The blade 1 manufactured through the above series of steps
As shown in FIG. 9, a pair is formed with another blade body 1A manufactured through a similar manufacturing process, and the pair of blade bodies 1 and 1A are respectively provided with synthetic resin handle bodies 2 and 2A. Is attached. As a specific material of the pattern body 2, 2A,
For example, a fiber reinforced resin such as a glass fiber reinforced resin or a carbon fiber reinforced resin having high mechanical strength is applied. Each of the handle bodies 2 and 2A is provided with a hole 20 through which a user's finger passes and a support portion 21 for supporting the blade bodies 1 and 1A. The support portion 21 has holes 22 corresponding to the fulcrum holes 6 of the blade bodies 1 and 1A, and holes 23 and 23 corresponding to the screw holes 60 of the blade bodies 1 and 1A.
Is also provided. The connection between the blade bodies 1 and 1A and the handle bodies 2 and 2A is performed by screwing a screw (bolt) 24 inserted into the hole 23 into the screw hole 60. By employing such connecting means using the screw body 24, the connecting strength between the blade bodies 1 and 1A and the handle bodies 2 and 2A can be increased, and the assembling work can be easily performed. However, the present invention is not limited to this.
In the present invention, for example, the blade bodies 1 and 1A and the handle bodies 2 and 2A may be connected by caulking using rivets or the like.
Alternatively, for example, a protrusion may be formed on the handle body 2, 2 </ b> A, and the protrusion may be inserted into an appropriate hole of the blade body 1 and connected. Further, means for integrating the handle bodies 2 and 2A with the blade bodies 1 and 1A by insert molding may be employed.

In this embodiment, the blades 1, 1
By connecting 1A and handle 2, 2A respectively,
A pair of scissors pieces 4, 4A are manufactured. FIG. 10 shows a pair of scissors pieces 4 manufactured by the above-described method for manufacturing scissors.
It is a front view which shows the scissors comprised combining 4A. FIG. 11 is an enlarged sectional view of the main part.

The connecting portion 3 for mutually connecting the pair of scissors pieces 4 and 4A of the scissors has the following structure. That is, as is well shown in FIG. 11, the connecting portion 3 is protruded from the cylindrical nut 30 attached to the blade body 1 of one scissor piece 4 and the handle 2A of the other scissor piece 4A. It comprises a cylindrical portion 31, a bolt 32 and a nut 33, and caps 34 and 34a.

The cylindrical nut 30 is fixed to the blade body 1 by the steps shown in FIGS. That is,
As shown in FIG. 14, the cylindrical nut 30 has a flange portion 30 b at one end thereof, and the cylindrical nut 30 is provided in the fulcrum hole 6 so as to lock the flange portion 30 b to the blade body 1. Insert 30. Next, as shown in FIG. 15, a screw member 50 as a tool is screwed into a screw portion 30a formed on the inner peripheral surface of the cylindrical nut 30, and an auxiliary member 51 is brought into contact with the flange portion 30b. . In such a state, as shown in FIG.
While pressing in the direction, the screw member 50 is moved in the direction of the arrow N2. Then, a part of the cylindrical nut 30 is buckled and deformed, and the blade body 1 can be sandwiched between the buckled deformed portion 30c and the flange portion 30b.
0 can be fixedly attached to the blade body 1.

As shown in FIG. 13, the cylindrical portion 31 is formed integrally with the handle 2A.
A fulcrum hole 6 is inserted. The cylindrical portion 31 is provided with a through hole 35 into which the cylindrical nut 30 can be fitted. The cylindrical portion 31 is fitted to the cylindrical nut 30 so as to be slidable and rotatable. You.

The bolt 32 is inserted into the through hole 35 from the outer surface side of the one scissor piece 4A, and the cylindrical nut 30
Screw portion 30a. A nut 33 such as a hexagon nut is screwed into the bolt 32 from the other scissor piece 4B side. Therefore, the pair of scissors pieces 4 and 4 </ b> A are connected to each other by tightening the nut 33 and the cylindrical nut 30 to the bolt 32.

The caps 34, 34a are made of, for example, a synthetic resin, and include a head 32a of the bolt 32 and a nut 33.
Are fitted and mounted in the concave portions 36 and 36a for disposing the respective components. These caps 34, 34a prevent the bolts 32 and the nuts 33 from appearing in an irregular shape from the outside, and serve to improve the appearance of scissors. These caps 34 and 34a are preferably provided so that the degree of tightening of the bolts 32 can be appropriately adjusted as necessary.
It can be freely attached to and detached from the recesses 36 and 36a. The cap mounting means as described above includes the recess 3
In place of the means for fitting the cap to the 6, 36a, a means for fitting the cap to, for example, the head of a bolt, a nut, or the tip of a bolt shaft penetrating the nut may be employed.

The scissors assembled as described above are adjusted for final sharpness before being shipped or sold as a product. This adjustment operation can be performed mainly by adjusting the degree of tightening of the bolt 32 and the nut 33 of the connecting portion 3 and the degree of warpage of the blade bodies 1 and 1A. However, the bolt 32
Is screwed into two nut members, the nut 33 and the cylindrical nut 30, so that a so-called double nut function is obtained by a synergistic effect of these two nut members. Therefore, the bolts 3 should be adjusted so that the scissors are sharpened.
After adjusting the tightening condition of 2, the bolt 32 is prevented from being easily loosened by subsequent use,
Good sharpness of the scissors is maintained. In addition, the cylindrical nut 30 is provided on each of the concave portions 1 of the pair of blades 1 and 1A.
Because it protrudes so as to be located inside 3, 13,
Unnecessarily increasing the dimension in the thickness direction of the connecting portion 3 due to the additional provision of the cylindrical nut 30 can be avoided. The handle 2A has a cylindrical portion 31 protruding therefrom. The cylindrical portion 31 is also provided with the cylindrical nut 30.
Similarly to the above, they are arranged in the concave portions 13, 13,
In addition, since the connecting portion 3 is fitted to the cylindrical nut 30, it is possible to avoid an increase in the size of the connecting portion 3 due to the presence of the cylindrical portion 31.

When the scissors are used, the pair of scissors pieces 4 and 4A substantially rotate relative to each other about the fitting portion between the tubular nut 30 and the tubular portion 31. Therefore, if the mutually sliding part of the cylindrical nut 30 and the cylindrical part 31 is a parallel plane, a pair of blades 1 and
When the blades 1A are rubbed, the blades 1 and 1A can be operated in parallel with each other. As a result, the deflection in the thickness direction of the blade when using scissors can be reduced, and the sharpness can be improved.

Further, when using the above scissors,
In addition to simply rotating the pair of scissors pieces 4, 4A relative to each other about the connecting portion 3, the base end 1 of the blade body 1, 1A
The outer peripheral portions 14A, 14A of 0, 10 can be slid mutually facing each other. These outer peripheral portions 14A, 14
As means for reliably performing face-to-face sliding between A, when attaching the blade bodies 1 and 1A to the handle bodies 2 and 2A, the outer peripheral edges 14A and 14A are attached to the side faces and surfaces of the handle bodies 2 and 2A, respectively. Rather than being one, they are projected in a direction facing each other by an appropriate dimension λ from the side surfaces of the handle bodies 2 and 2A (see FIG. 13). As shown in FIG. 10, the outer peripheral edge 14 </ b> A of each of the base ends 10 extends from one side edge 18 of each of the abdominal sides (formation side of the small blade 70) of the blade bodies 1 and 1 </ b> A to the peak side ( It is continuous in a region reaching the other side edge 18a (the side opposite to the abdomen). Therefore, such outer peripheral portions 14A, 14A
The blades 1, 1A are slid by facing each other.
The operation of each of the tip portions 11 is also stabilized, and undesired deflection in the blade thickness direction is reduced.

As described above, in the above-mentioned scissors, the operation in which the blades 1 and 1A are rubbed with each other, more specifically, the blades 1 and 1A are successively brought into point contact with each other. , 1A in the longitudinal direction can be defined by the facing sliding operation of the outer peripheral edges 14A, 14A and the sliding operation of the cylindrical nut 30 and the cylindrical portion 31 in the connecting portion 3. As a result, excellent sharpness can be obtained. In particular, each of the outer peripheral edges 14A, 14A is formed in an arc shape, and the center of the arc radius is defined as the center of the relative rotation of the pair of scissors pieces 4, 4A, that is, the mounting position of the bolt 32 or its vicinity. If it is set to the portion, the arc-shaped outer peripheral portions 14A, 14A slide face-to-face with each other along the direction of the arc, so that the face-to-face sliding operation between the outer peripheral edges 14A, 14A can be performed more smoothly. , And can be stabilized. More specifically, the rubbing state between the outer peripheral edges 14A, 14A can be stabilized irrespective of the opening angle of the blades 1, 1A, and is expanded when the blades 1, 1A are narrowed. The operation feeling with time can be stabilized.

Further, in the above-mentioned scissors, as shown in FIG. 12, for example, when cutting a desired cutting object m such as cloth, the cut cutting object m relatively moves along the arrow N3 direction. Second on each outer blade side of blade bodies 1 and 1A
It follows the inclined surface 15 of the side surface part 17. Therefore, the resistance of the blades 1 and 1A to the cutting object m when cutting the cutting object m can be reduced. Further, the first side surface portion 12 on the inner blade side of each of the blade bodies 1 and 1A.
Is provided with a concave portion 13, and the concave portion 13
This will help escape of the cutting waste of the cutting object m.

In the scissors having the above structure, as is apparent from the above-described manufacturing process, the concave portions 13 are formed in each of the blade bodies 1 and 1A by press working, so that the inclined surfaces 15 and the flange-shaped outer portions are formed. Various portions such as the peripheral portion 14A are formed at the same time. Therefore, the manufacturing cost of the scissors having the above configuration can be reduced.

In the above embodiment, the outer peripheral edge of the base end of the blade body is formed in an arc shape when viewed from the front. However, the present invention is not limited to this, and the specific shape is not limited.
In the present invention, even when the outer peripheral edge of the base end is formed in a non-circular flange shape in a front view, the outer peripheral edges are rubbed against each other by sliding the outer peripheral edges face each other. It is possible to stabilize the operation. The surface of the outer peripheral edge of the base end of the blade may be finished as a smooth flat surface, but may be finished as a slightly curved surface.

In addition, the specific configuration of each part of the scissors according to the present invention is not limited to the above-described embodiment, and various design changes can be made. For example, the handle attached to the blade is not necessarily limited to a synthetic resin, and may be other materials. Further, the scissors according to the present invention are:
It can also be configured as scissors for various uses other than the scissors for cloth cutting. Furthermore, the specific configuration of the method for manufacturing the scissors according to the present invention is not limited to the above embodiment, and can be variously changed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a step of forming a work serving as a prototype of a blade body from a metal plate in the method for manufacturing scissors according to the present invention.

FIG. 2 is a front view showing a workpiece obtained by the process shown in FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a side view of the work shown in FIG. 2;

FIG. 6 is a perspective view showing a step of forming a hole in a predetermined work in the scissors manufacturing method according to the present invention.

FIG. 7 is a front view showing a step of performing a quenching process on a predetermined work in the scissors manufacturing method according to the present invention.

FIG. 8A is a cross-sectional view of a work showing a state before a blade polishing operation is performed, and FIG. 8B is a cross-sectional view of a blade body obtained after the work polishing is completed. .

FIG. 9 is a perspective view showing a step of connecting the blade body and the handle body.

FIG. 10 is a front view showing scissors formed by combining a pair of scissors pieces manufactured by the method for manufacturing scissors.

11 is an enlarged sectional view of a main part of the scissors shown in FIG.

FIG. 12 is a sectional view showing a use state of the scissors shown in FIGS. 10 and 11;

FIG. 13 is a cross-sectional view of a main part showing an example of an operation of assembling the scissors shown in FIGS. 10 and 11;

FIG. 14 is a fragmentary cross-sectional view showing an example of an operation of attaching a cylindrical nut to a blade body.

FIG. 15 is a fragmentary cross-sectional view showing an example of the operation of attaching the cylindrical nut to the blade body.

FIG. 16 is a fragmentary sectional view showing an example of an operation of attaching a cylindrical nut to a blade body.

FIG. 17 is a perspective view showing an example of a conventional scissors.

18 is a perspective view showing the blade body of the conventional scissors shown in FIG.

FIG. 19 is a cross-sectional view of a main portion showing a structure of a connecting portion of a pair of scissors pieces of a conventional scissors.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A blade body 1a work 2, 2A handle 3 connecting part 4, 4A scissors piece 7 inner blade 9 metal plate 10 base end part 11 tip part 12 first side surface part 13 concave part 14 outer peripheral edge 14A outer peripheral edge ( (Of base end) 15 inclined surface 17 second side surface portion 30 cylindrical nut 31 cylindrical portion 32 bolt 33 nut 70 small blade 90 metal plate

Claims (9)

[Claims] 1. A scissor comprising: a pair of scissors pieces having a pair of blades formed by pressing a metal plate; and a connecting portion that connects the pair of scissors pieces so as to be relatively rotatable. In each of the pair of blades, a concave portion that forms a flange shape connecting the outer peripheral edge of the base end of each of the blades in the width direction of each blade is formed by press working. A pair of scissors, wherein the outer peripheral edge of the base end is configured to slide face-to-face with each other when the pair of scissors pieces rotate relative to each other about the connection portion. 2. The method according to claim 1, wherein an outer peripheral edge of the base end portion is formed in an arc shape having a predetermined width centered on a center of relative rotation of the pair of scissors pieces or a point near the center. The described scissors. 3. The concave portion is provided on a first side of an inner blade of the blade body.
The scissors according to claim 1 or 2, wherein the scissors extend from the base end of the blade body to the tip end side so as to depress an inner region of the side surface except for the entire outer peripheral edge. 4. The concave portion is provided on the outer blade side of the blade body.
The scissors according to claim 3, wherein the side surface is formed so as to provide an inclined surface that makes the thickness of the blade body thinner toward the abdomen of the blade body. 5. Each of the blade bodies is partially quenched, and the quenched region is at least a blade forming portion and an outer peripheral edge of the base end portion. The scissors according to claim 1. 6. The scissors according to claim 1, wherein a handle made of synthetic resin is attached to each of said pair of blades. 7. A cylindrical nut fixed to and attached to one of the pair of scissor pieces by being inserted into a fulcrum hole provided in one of the pair of scissor pieces, A cylindrical portion provided on the other of the pair of scissors, a bolt and a nut for tightening, and the cylindrical portion is slidably rotated with respect to the cylindrical nut; As much as possible, the bolt is inserted into the cylindrical portion and the cylindrical nut in a series and screwed into the cylindrical nut. The scissors according to any one of claims 1 to 6, wherein the scissors are fastened by the bolts and nuts in their axial directions. 8. A pair of scissors in which a pair of scissors are connected to each other via a connecting portion so as to be relatively rotatable, wherein the connecting portion is provided on one of the pair of scissors. A cylindrical nut fixedly attached to the one scissor piece by being inserted into a fulcrum hole, a cylindrical portion provided on the other scissor piece of the pair of scissors pieces, a bolt for tightening, and And a nut,
The tubular portion is fitted to the tubular nut so as to be slidable and rotatable, and the bolt is inserted through the tubular portion and the tubular nut in series, and Scissors, which are screwed to the nut, and wherein the cylindrical portion and the cylindrical nut are fastened by the bolts and nuts in their axial direction. 9. A scissor including a pair of scissors pieces having a pair of blades formed by pressing a metal plate and a connecting portion that connects the pair of scissors pieces so as to be relatively rotatable. A scissors manufacturing method for forming a pair of blades by pressing each of the pair of blades, the outer peripheral edge of the base end of each of these blades connected in the width direction of each blade. A method for producing scissors, characterized in that a concave portion formed in the above is formed by press working.