JP7301369B2 - Assist force imparting tool, scissors, shearing tool - Google Patents

Description

TECHNICAL FIELD The present invention relates to an assisting force applying tool, scissors, and a shearing tool, and more particularly to a spring-type assisting force applying tool for scissors/shearing tool, and scissors/shearing tool with spring-type power assist.

Conventionally, power-assisted scissors include, for example, the following.
Patent Literature 1 describes "scissors with an electric assist function that are excellent in cutting workability and have a method of shearing by the resultant force of the shearing force due to the gripping force and the shearing force due to the power of the motor" (summary).
In Patent Document 2, "a pair of scissors for hairdressing or beauty, comprising a scissors main body 100 and an assisting means 40", "reduces the burden on fingers, wrists and arms, prevents tendonitis, and prevents tendonitis." Scissors that can be used even by cutting technicians who have done it” (summary) is described.
In Patent Document 3, "when the scissors 2 are changed from the open state to the closed state, the assist force is calculated based on the force measured by the force sensor 5 and the opening angle θ measured by the angle sensor 4. and a control unit 6 that commands an assist force to the actuator so that the load on the user's finger or the like can be reduced while satisfying the user's feeling of use. Functional scissors are described.

JP 2014-188349 A JP 2018-139790 A Japanese Patent Application Laid-Open No. 2019-84008

In general, barber and beauty scissors (hereinafter referred to as barber scissors) are used with a relatively light force, but there are also ways of opening and closing them quickly, such as two or three times per second. In addition, the working posture is such that one blade is supported with four fingers while the arm is stretched, and cutting is performed only with the thumb. For example, the accumulated fatigue from daily work over several decades may cause tenosynovitis in some people.
In order to solve these problems, the conventional technology as described above is provided with a mechanical component/mounting component that applies an assisting force. However, in such a conventional technology, it is expected that the hand and arm will be burdened by the additional weight due to the use of the actuator or the like. . In addition, since the conventional technology uses an electrical configuration, it is expected that the structure will be complicated and relatively expensive.

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide an assisting force imparting tool for scissors/shearing tools, scissors, and a shearing tool, which are simple in structure and light in weight.

According to the first solution of the present invention,
A pair of scissors or a shearing tool comprising a first half of scissors, a second half of scissors, and a shaft supporting portion that rotatably connects the first half of scissors and the second half of scissors, wherein the first half of scissors an assisting force imparting portion that imparts an assisting force to cutting by the body and the second half of scissors,
a restoring force imparting portion having one end and the other end and having a restoring force due to elastic deformation ;
a supporting and fixing part that supports one end of the restoring force applying part and is fixed to the pivot part or the second scissors half body;
a sliding portion that slidably supports the other end of the restoring force applying portion and is fixed to the first scissors half;
The restoring force imparting portion is elastically deformed by the other end side of the restoring force imparting portion sliding on the sliding portion when the handles of the first half of the scissors and the second half of the scissors are opened. Provided is an assisting force imparting tool that exerts a force to return to its original state when it is closed.

According to the second solution of the present invention,
are scissors,
a first half of scissors;
a second half of scissors;
a shaft supporting portion that rotatably connects the first scissors half and the second scissors half;
an assisting force imparting portion that imparts an assisting force to cutting by the first half of scissors and the second half of scissors;
with
The assist force applying section is
a restoring force imparting portion having one end and the other end and having a restoring force due to elastic deformation ;
a supporting and fixing part that supports one end of the restoring force applying part and is fixed to the pivot part or the second scissors half body;
a sliding portion that slidably supports the other end of the restoring force applying portion and is fixed to the first scissors half;
The restoring force imparting portion is elastically deformed by the other end side of the restoring force imparting portion sliding on the sliding portion when the handles of the first half of the scissors and the second half of the scissors are opened. A pair of scissors are provided which are adapted to be retracted when closed.

According to the third solution of the present invention,
a shearing tool,
a first shear tool half;
a second shearing tool half;
a pivotal support that rotatably connects the first shearing tool half and the second shearing tool half;
an assisting force imparting portion that imparts an assisting force to the cutting by the first shearing tool half and the second shearing tool half;
with
The assist force applying section is
a restoring force imparting portion having one end and the other end and having a restoring force due to elastic deformation ;
a support fixing portion that supports one end portion side of the restoring force applying portion and is fixed to the pivot portion or the second shearing tool half;
a sliding part that slidably supports the other end of the restoring force applying part and is fixed to the first shearing tool half,
The restorative force imparting portion is configured such that when the handles of the first shearing tool half and the handle of the second shearing tool half are opened , the other end side of the restoring force imparting portion slides on the sliding portion to provide an elastic force. A shearing device is provided that is deformed to exert a restoring force when closed.

INDUSTRIAL APPLICABILITY As described above, the present invention can provide an assisting force imparting tool for scissors/shearing tools, scissors, and a shearing tool that realizes power assist with a simple structure and light weight.

(A) A configuration diagram (exploded view) of the scissors with power assist, (B) a cross-sectional view centered on the shaft support portion 3 . Explanatory drawing of the opening and closing operation of scissors. Explanatory drawing about the characteristic of a superelastic alloy. 4A and 4B are configuration diagrams of various shapes of the wire 41. FIG. FIG. 4 is an explanatory diagram of the attachment angle of the wire 41 and the reaction force (restoring force) of the spring; FIG. 4 is an explanatory diagram of the attachment position of the wire 41 and the reaction force (restoring force) of the spring; FIG. 4 is an explanatory diagram of the mounting position of the (superelastic alloy) wire 41 on the support side with respect to the scissors and the reaction force (restoring force) of the spring. FIG. 4 is an explanatory diagram of the mounting position of the (superelastic alloy) wire 41 on the free end side with respect to the scissors and the reaction force (restoring force) of the spring. 4A and 4B are explanatory diagrams of modified examples (1) and (2) of the support fixing portion 42. FIG. The block diagram of a set screw system. The block diagram of a screw system. The block diagram of a pin system. The block diagram of a claw system. The block diagram of a magnet system. The block diagram of a stranded wire system. The block diagram of a link system. The block diagram of a roller system. Explanatory drawing about the attachment method of a wire (spring).

A. overview

As an example, for barber scissors and beauty scissors, a right-handed person usually puts his or her ring finger in the scissor handle ring and supports the scissors with the remaining three fingers except the thumb. This keeps one scissor half stationary. The blade of this scissors half is called a static blade, while the thumb is inserted into another handle loop of the other scissors half, and by moving this finger, the scissors are operated to cut the hair. The blade of this scissors half is called a movable blade.
In the present invention and/or this embodiment, for example, a wire such as a superelastic alloy wire is cantilevered and fixed on the second scissors half (static blade) side, and the opposite side of the wire is attached to the first scissors half ( Pass it through the hole in the sliding part attached to the thumb ring on the moving blade) side. When the scissors are opened, the wire is elastically deformed, and in the direction of closing the scissors, a force (restoring force) acts to make the wire return to its original state, thereby reducing the operating force of the movable blade. That is, it is a power assist.

According to the present invention and/or this embodiment, for example, a first scissors half having a moving blade portion and a thumb ring and a second scissors half having a stationary blade portion and a third finger ring are rotated by a shaft support. The scissors main body, which is freely connected and has a moving blade portion and a stationary blade portion forming a cutting surface, and an assisting force imparting portion, which elastically deforms when the scissors open and restores the force (restoration force) when the scissors closes. It is possible to provide scissors for hairdressing or beauty, scissors for other purposes, and shearing tools having a restoring force imparting part such as a superelastic alloy wire (spring) at a position where a force is applied.
Furthermore, according to the present invention and/or this embodiment, for example, there is provided an assisting force imparting tool that has the same configuration as such an assisting force imparting unit and can be externally attached to an existing scissors or shearing tool. be able to.

According to the present invention and/or this embodiment, for example, the following special effects are obtained.
1) When the scissors are opened with no load, the force is accumulated in the restoring force imparting part, and when the scissors are closed and cut, the accumulated force is released to assist the force of the arms and fingers, which is applied to the arms and fingers. It is possible to realize scissors that reduce the burden on the body and prevent the occurrence of injury.
2) Work by barbers, beauticians, gardeners, people with disabilities, children, the elderly, etc. (hereinafter sometimes referred to as barbers, etc.) who cannot or find it difficult to use ordinary scissors. We can provide scissors that can
3) It is possible to reduce the weight of mechanical parts (mounted parts) of the means for applying the assisting force, simplify the structure, and reduce the cost.
4) Preventing the possibility of injury such as tenosynovitis, which may be unavoidable for barbers, etc. due to occupational reasons, or already disabled and unable to use normal scissors or shearing tools, or Difficult barbers and the like can expect to be able to return to work and use.
5) Mechanical parts (mounted parts) that provide power assist can be additionally modified and attached to existing scissors and shearing tools, so the economic burden on barbers and the like can be reduced. Scissors/shearing tools can be used.
6) The force required for wide opening of the scissors can be reduced compared to a spring mounting mechanism which is proportional to the angle of opening of the scissors.
7) Furthermore, by using a superelastic alloy wire (spring), it is possible to further reduce the reaction force at the maximum opening angle.

The present invention and/or the present embodiment will be described below as an example applied mainly to scissors for hairdressing and beauty. It can be applied to scissors/shearing tools (including nippers, etc.) for cutting wire rods, plate materials, and other suitable shapes. Further, the present invention and/or the present embodiment can also be applied to scissors/shearing tools having double-edged blades in which there is no distinction between a moving blade and a stationary blade.

B. Scissors/shearing tool with power assist, power assisting tool for scissors/shearing tool

FIG. 1(A) shows a configuration diagram (exploded view) of scissors with power assist, and FIG. This embodiment is, as an example, a configuration example of power assist scissors using a superelastic alloy wire.
FIG. 2 shows an explanatory diagram of the opening and closing operation of the scissors.

The scissors of this embodiment comprise a first scissors half body 1 , a second scissors half body 2 , a pivot portion 3 and an assisting force applying portion 4 .

The first scissors half 1 has a movable blade 1a, a handle 1b (handle), and a thumb ring 1c, and a hit point 11 is attached to the thumb ring 1c. The second scissors half 2 has a stationary blade 2a, a handle 2b (handle), and a third finger ring 2c. The shaft support 3 has a base screw and rotatably connects the first scissors half 1 and the second scissors half 2 . The assisting force imparting unit 4 (assisting force imparting tool) imparts an assisting force to the cutting by the cutting surface formed by the movable blade 1a and the stationary blade 2a.
The assisting force imparting portion 4 includes a wire (restoring force imparting portion) 41 such as a superelastic alloy wire, and one end portion of the wire 41 is supported by a mounting portion 46 and attached to the shaft support portion 3 or the second scissors half body 2. A support fixing part 42 fixed by a fixing screw 44 and a free end side sliding part 43 for slidably attaching the other end side of the wire 41 to the hit point 11 of the first scissors half 1 for further protection. A cap 45 may be provided. When the scissors (blades or handle) are opened, the wires 41 elastically deform, and when the scissors (blades or handle) are closed, a force acts to restore the original shape.

A support fixing portion 42 for cantilevering a wire 41 such as a superelastic alloy wire is attached near the rotation axis of the shaft support portion 3 on the side of the second scissors half 2 (static blade 2a), and the opposite wire free end side is attached. By passing the wire 41 through the hole of the free end slide portion 43 attached to the thumb ring 1c on the first scissors half 1 (movable blade 1a) side, the scissors can be opened while elastically deforming without restraining the wire 41. can. In the operation of closing the scissors, a force (restoring force) that causes the wire 41 to return to its original state acts to reduce the operating force of the movable blade 1a. That is, it is a power assist.
By changing the fixing position and fixing angle of the wire 41 such as a superelastic alloy wire on the side of the second scissors half 2 (static blade 2a) to the cantilever by the supporting fixing part 42 (mounting part 46), the opening of the scissors can be changed. Since the amount of elastic deformation associated with the angle can be changed, the power assist force can be arbitrarily changed. Also, by changing the wire diameter, shape, etc. of the wire 41 such as a superelastic alloy wire, the power assist force can be arbitrarily changed.
The sliding portion 43 with which the free end wire 41 located on the side of the first scissors half 1 (movable blade 1a) is in contact is made of, for example, a resin (Teflon (registered trademark), Rulon, etc.) with low frictional resistance to the wire 41. It is even better to use ceramics or the like.

By separating the mechanical parts/implemented parts (assisting force imparting tool) that impart power assist from the scissors/shearing tool, the existing scissors/shearing tool can be additionally modified and installed. This reduces the economic burden on barbers and the like, and allows them to use familiar or desired scissors/shearing tools.
On the other hand, the scissors and the assisting force imparting unit 4 may be integrated in advance instead of being separately configured. In this case, the first scissors half 1 and the sliding portion 43, and the second scissors half 2 and the supporting/fixing portion 42 can be formed integrally.

Each component will be described in detail below.

Stationary blade 2a (second scissors half 2):
For example, when a right-handed person uses scissors for hairdressing and beauty, the ring finger is inserted into the ring (ring 2c) of the handle 2b of the scissors, and the remaining three fingers excluding the thumb support the scissors. This keeps the scissor halves stationary. This is called a stationary blade 2a.

Movable blade 1a (first scissors half 1):
For example, in the case of right-handed scissors for hairdressing and beauty, the thumb is inserted into the ring (thumb ring 1c) of the handle 1b, and the scissors are operated by moving this finger to cut the hair. This is called a movable blade 1a.

Hit Point 11:
It is a part that mitigates (absorbs) impact when the finger insertion ring on the second scissors half 2 (stationary blade 2a) side and the finger insertion ring on the first scissors half 1 (moving blade 1a) side interfere when the scissors are closed. The material should be an elastic material that absorbs impact, such as rubber. The first scissors half 1 (movable blade 1a) is fixed to the finger insertion ring (thumb ring 1c) by screwing.

Axle 3 :
The shaft supporting portion 3 has, for example, a base screw, and is a screw with a female thread processed at the center of the male screw of the base screw. change depending on Since this screw is fixed to the first scissors half 1 (movable blade 1a) side, it is structured to rotate as the first scissors half 1 (movable blade 1a) side is opened and closed.

Wire (restoring force applying portion) 41:
As the wire 41, for example, a superelastic alloy wire may be used (see below). Power assist force (restoring force) with arbitrary characteristics by combining the angle/position, wire wire diameter/thickness, spring constant/deformation amount of wire 41 and generated reaction force, etc. attached to support/fixing portion 42 of wire 41. can be obtained. This installation (adjustment) is a simple structure that can be installed by the user (barber, etc.). As the wire (restoring force applying portion) 41, in addition to ordinary wires and superelastic alloy wires, other appropriate restoring force applying portions using other elastic wires, piano wires, steel wires, copper wires, etc. can be used. Also, appropriate metal materials such as spring steel, stainless steel, steel, shape memory alloys, etc., appropriate materials such as chemical substances such as beryllium, plastic, rubber, nylon, etc. A restoring force application part can be used. The wire (restoring force applying portion) 41 includes a wire rod having an appropriate cross section such as an elliptical, polygonal, or trapezoidal shape in addition to a normal round cross-sectional shape (see below).

Supporting and fixing part 42:
The wire 41 is fixed/supported to the mounting portion 46 of appropriate fixing means such as press-fitting/insertion, adhesion, screws, or the like. Further, the fixing of the supporting fixing portion 42 to the stationary blade 2a is performed by appropriate means such as screws, press-fitting of pins, a latch structure using claws or the like, magnets, adhesion, or the like (see later). In this example, the attachment portion 46 for attaching the wire 41 to the support fixing portion 42 is provided with a hole for press-fitting and insertion. For example, the wire 41 may be preliminarily attached to one attachment portion 46, and the restoring force may be preset. Alternatively, a plurality of mounting portions 46 are provided with different positions and/or angles, and the user or the like selects one of the mounting portions 46 and attaches the wire 41 to adjust the restoring force according to each mounting portion 46. (see below).

Sliding portion 43:
When the scissors are opened, the wire 41 simply passes through the hole of the free end sliding portion 43, so that it moves smoothly without being constrained. Although a hole is used in this example, it is not limited to the hole, and an appropriate shape such as a concave portion, a U-shaped portion, or a groove may be used (see later). The material of the sliding portion 43 is, for example, a material used for sliding bearings such as Teflon (registered trademark), Rulon (trade name), or ceramics, which has a low frictional resistance against the wire 41, or an oil-impregnated bearing. Although the material is good, it is not limited to this. In addition to this method, the connecting structure on the free end side includes means such as a method using a stranded wire, a method using a link mechanism, and a method using a roller (see later).

Fixing screw 44:
It is a screw for fixing the support fixing part 42 to the second scissors half 2 (stationary blade 2a) side. For example, since it is screw-fixed to the base screw, when the base screw turns, the fixing screw 44 also rotates (note that the support fixing part 42 is fixed to the second scissors half 2 (static blade 2a) side). is done.).

Protective cap 45:
The protective cap 45 can be attached to a structure intended to protect the wire 41 from danger due to exposure of the free end of the wire 41, and to be fixed by screwing, press-fitting, bonding, or the like. Alternatively, the protective cap 45 may be omitted, and an edge processing method such as bending and rounding the tip by metal processing may be used.

When the present invention and/or this embodiment is applied to a shearing tool, for example, the first half of the scissors and the second half of the scissors are replaced with the first half of the shearing tool and the second half of the scissors, respectively, in the description. A configuration similar to that of scissors can be adopted by reading two shearing tool halves.

C. Wire (restoring force imparting portion) 41

FIG. 3 shows an explanatory diagram of the characteristics of the superelastic alloy.
The properties of the superelastic alloy and the wire free end structure will be described below.
When normal metal materials are deformed beyond the elastic region and then unloaded, only the elastic deformation returns and permanent strain remains. When loaded, the strain disappears and it returns to its original shape. (If necessary, see the Furukawa Electric website https://www.furukawa-ftm.com/index.htm, etc.)
Since the stress of the superelastic alloy is almost constant in the yield state, the stress applied to the bending deformation portion of the superelastic alloy wire 41 that deforms when the scissors are opened hardly changes beyond a certain opening angle.

By applying the characteristics of the superelastic alloy wire 41 as described above to scissors and shearing tools, for example, the range of opening the scissors can be set to an opening angle/displacement exceeding the elastic region, and the scissors can be opened beyond the elastic region. Even in this case, the wire 41 can be used so that the load applied to the user's hand does not exceed a certain level.

FIG. 18 shows an explanatory diagram of a wire (spring) attachment method.
FIG. 18(A) is an explanatory diagram when a torsion spring is attached.
When a torsion spring is attached as shown in the state 109 when the spring alone is free to provide an assist force, since the opening angle of the scissors and the reaction force of the spring are in a proportional relationship as shown in the graph, the opening angle of the scissors is increases, the reaction force (restoring force) of the spring also increases. In this method, the resistive load increases in accordance with the opening angle of the spring, so sufficient assist force is generated when the scissors are closed. , it may not be preferable from the viewpoint of reducing the burden on the fingers. Also, if the spring reaction force becomes excessive, the momentum to close the scissors may increase.

FIG. 18(B) is an explanatory diagram of the mounting method of the mechanism (this mechanism) of the present invention and/or the present embodiment.
Since the wire end of the first scissors half 1 (moving blade 1a side) of the scissors is not fixed and is a free end, the length of the wire 41 (distance L from the cantilever support) when opening the scissors ) is longer (L2>L1), which is advantageous for generating a moment of force (torque). The mounting method of this mechanism makes it possible to reduce the force (load resistance received by the arm and fingers) that must be generated by the hand when opening the scissors, thereby reducing the burden on the user's arms and fingers.
Also, by using a superelastic alloy for the wire 41, a lower force is required to open the scissors.
The mounting method of this mechanism is that even with a normal spring steel wire, the reaction force is reduced as shown in the graph due to the non-linearity of the spring mounting method, so the reaction force can be suppressed when the opening angle is large.

Various shapes of the wire 41 will be described below. The wire 41 may have various shapes as shown.
FIG. 4 shows configuration diagrams of various shapes of the wire 41. As shown in FIG.
FIG. 4(A) has a circular cross-section and the same cross-sectional shape along the length direction.
FIG. 4(B) has a rectangular cross-section and the same cross-sectional shape along the length direction.
FIG. 4(C) shows a shape that has a rectangular cross section and tapers toward the tip.
FIG. 4(D) shows a shape that has a round cross section and tapers toward the tip.

The wire 41 such as a superelastic alloy wire of the basic structure of the present embodiment has a circular cross section and all have the same cross-sectional shape. Various cross-sectional shapes can be adopted as appropriate. In addition, the cross-sectional shape and thickness may be uniform in the length direction, or may be non-uniform. When a shape tapering toward the tip is used, there is a characteristic that a spring reaction force (restoring force) can be obtained while suppressing the load when opening the scissors.

D. Support fixing part 42

The attachment angle/position of the wire 41 to the supporting/fixing portion 42 and the reaction force (restoring force) of the spring will be described below.

FIG. 5 shows an explanatory diagram of the mounting angle of the wire 41 and the reaction force (restoring force) of the spring.
Depending on the angle at which the wire 41 is supported and fixed near the center of the scissors, the deformation of the wire 41 when the scissors are opened differs as shown in FIGS. The relationship between the opening angle of the scissors and the reaction force (restoring force) of the spring is shown in graphs A to C for each angle.

FIG. 6 shows an explanatory diagram of the attachment position of the wire 41 and the reaction force (restoring force) of the spring.
Even if the angle at which the wire 41 is supported and fixed near the center of the scissors is constant, the deformation state of the wire 41 when the scissors are opened differs as shown in FIGS. The relationship between the opening angle of the scissors and the spring reaction force (restoring force) is shown in graphs D to F, respectively.

FIG. 7 is an explanatory diagram of the attachment position of the support-side (superelastic alloy) wire 41 to the scissors and the reaction force (restoring force) of the spring.
When the position of the end supporting and fixing the wire 41 changes with respect to the scissors, the deformation state of the wire 41 when the scissors are opened differs as shown in FIGS. The relationship between the opening angle of the scissors and the spring reaction force (restoring force) is shown in graphs H to G, respectively.

FIG. 8 is an explanatory diagram of the mounting position of the (superelastic alloy) wire 41 on the free end side with respect to the scissors and the reaction force (restoring force) of the spring.
When the position of the free end of the wire 41 changes with respect to the scissors, the deformation state of the wire 41 when the scissors are opened differs as shown in FIGS. The relationship between the opening angle of the scissors and the spring reaction force (restoring force) is shown in graphs I to J, respectively.

As described above, a desired reaction force (restoring force) of the spring can be set by appropriately combining the angles and/or positions at which the wires 41 are attached. Regarding the restoring force, one characteristic may be preset, or a combination of angles and/or positions may be preset so as to set a plurality of characteristics. When setting a plurality of characteristics, the support fixing portion 42 is provided with a plurality of mounting portions 46 such as insertion openings for setting the wires 41 corresponding to the plurality of characteristics so that the user can select one of the mounting portions. By selecting the portion 46 and setting the wire 41, desired restoring force characteristics can be selected and set. As for each mounting portion 46, only the angle may be changed, only the position may be changed, or both may be changed.

FIG. 9(A) shows an explanatory diagram of a modified example (1) of the support fixing portion 42. As shown in FIG.
This modified example (1) shows an example of a mounting portion 46 that combines angles and positions. With the configuration as shown, the range of restoring force can be widened or set to an appropriate range. Any angle and/or position, or combination thereof, can be predetermined as appropriate.

FIG. 9B shows an explanatory diagram of a modified example (2) of the wire 41 supporting/fixing portion 42. As shown in FIG.
In the above description, the wire 41 is attached to the support fixing portion 42 by inserting the wire 41 into a hole. As shown, the wire 41 may be sandwiched or fixed in a recess or groove.
shows an explanatory diagram of

Next, various methods for fixing the support fixing portion 42 to the scissors will be described.

FIG. 10 shows a block diagram of the set screw system.
In this example, the supporting fixing portion 42 is fixed to the second scissors half 2 on the stationary blade side by a set screw 101 from the side.

FIG. 11 shows a block diagram of the screw system.
In this example, the supporting and fixing portion 42 is fixed to the second scissors half 2 on the stationary blade side by screws 102 from the upper surface.

FIG. 12 shows a block diagram of the pin system.
In this example, the support fixing portion 42 is fixed to the second scissors half 2 on the stationary blade side by inserting the pin 103 from the upper surface.

FIG. 13 shows a block diagram of the claw system.
In this example, the second scissors half body 2 on the stationary blade side is clamped and fixed by the support/fixing part 42 having the fixing claw 104 .

FIG. 14 shows a configuration diagram of the magnet system.
In this example, the support fixing portion 42 in which the magnet 105 is embedded is magnetically fixed to the second scissors half 2 on the stationary blade side.

As another fixing method of the support fixing portion 42, for example, the following method can be used.
・Fixing with adhesive ・Fixing with double-sided tape ・Fixing with hook-and-loop fastener (Velcro (registered trademark))

E. Sliding portion 43

Various configurations for attaching the sliding portion 43 on the free end side of the wire to the handle 1b (thumb ring 1c) of the scissors will be described below. These various configurations may be used.

FIG. 15 shows a configuration diagram of the stranded wire system.
In this example, a stranded wire 106 is fixed in the vicinity of the finger ring of the first scissors half 1 on the movable blade side, and the free end wire on the opposite side is connected.

FIG. 16 shows a configuration diagram of the link system.
In this example, a link arm 107 mechanical part is fixed in the vicinity of the finger ring of the first scissors half 1 on the moving blade side, and the free end wire on the opposite side is connected.

FIG. 17 shows a configuration diagram of the roller system.
In this example, a roller 108 mechanical component is fixed near the finger ring of the first scissors half 1 on the movable blade side. When the scissors are opened, the rollers in contact with the wire 41 rotate to reduce contact resistance (friction).

1 first half of scissors 2 second half of scissors 3 shaft support 3
4 assist force applying unit (assist force applying tool)
41 wire (restoring force applying part)
42 Support fixing part 43 Sliding part 44 Fixing screw 45 Protection cap 46 Mounting part

Claims (11)

A pair of scissors or a shearing tool comprising a first half of scissors, a second half of scissors, and a shaft supporting portion that rotatably connects the first half of scissors and the second half of scissors, wherein the first half of scissors an assisting force imparting portion that imparts an assisting force to cutting by the body and the second half of scissors,
a restoring force imparting portion having one end and the other end and having a restoring force due to elastic deformation ;
a supporting and fixing part that supports one end of the restoring force applying part and is fixed to the pivot part or the second scissors half body;
a sliding portion that slidably supports the other end of the restoring force applying portion and is fixed to the first scissors half;
The restoring force imparting portion is elastically deformed by the other end side of the restoring force imparting portion sliding on the sliding portion when the handles of the first half of the scissors and the second half of the scissors are opened. An assisting force imparting tool that exerts a force to return to its original state when it is closed.
are scissors,
a first half of scissors;
a second half of scissors;
a shaft supporting portion that rotatably connects the first scissors half and the second scissors half;
an assisting force imparting portion that imparts an assisting force to cutting by the first half of scissors and the second half of scissors;
with
The assist force applying section is
a restoring force imparting portion having one end and the other end and having a restoring force due to elastic deformation ;
a supporting and fixing part that supports one end of the restoring force applying part and is fixed to the pivot part or the second scissors half body;
a sliding portion that slidably supports the other end of the restoring force applying portion and is fixed to the first scissors half;
The restoring force imparting portion is elastically deformed by the other end side of the restoring force imparting portion sliding on the sliding portion when the handles of the first half of the scissors and the second half of the scissors are opened. The scissors are designed so that a force that tries to return to the original state is applied when the scissors are closed.
In the scissors or assisting force imparting tool according to claim 1 or 2,
Mounting angle or position of the restoring force applying portion to the supporting and fixing portion, spring constant or deformation amount and generated reaction force of the restoring force applying portion, diameter or thickness of the restoring force applying portion, and of the restoring force applying portion A pair of scissors or an assisting force imparting tool characterized in that a power assisting force having a predetermined characteristic is set by setting a cross-sectional shape or a combination thereof.
In the scissors or assisting force applying tool according to any one of claims 1 to 3,
The supporting and fixing part includes a plurality of mounting parts having different positions and/or angles for supporting one end side of the restoring force applying part,
A pair of scissors or an assisting force imparting tool, characterized in that a power assisting force can be adjusted by selecting one of the plurality of mounting portions and supporting one end side of the restoring force imparting portion.
In the scissors or assisting force applying tool according to any one of claims 1 to 4,
The restoring force imparting portion is a superelastic alloy wire, and the opening range of the handle of the first half of the scissors and the second half of the scissors is an opening angle/displacement that exceeds the elastic region of the characteristics of the superelastic alloy wire. Scissors or an assist force imparting tool characterized by doing.
In the scissors or assisting force imparting tool according to any one of claims 1 to 5,
The scissors or the assisting force imparting tool, wherein the supporting and fixing part is fixed to the shaft supporting part or the second scissors half by means of a latch structure using claws or a magnet.
In the scissors or assisting force imparting tool according to any one of claims 1 to 5,
The shaft support has a base screw with a female thread at the center of the male screw,
The support fixing part is attached to the internal thread of the base screw by a screw;
Scissors or an assist force imparting tool characterized by
In the scissors or assisting force applying tool according to any one of claims 1 to 7,
The sliding part has a hole or recess, a U-shaped part or a groove through which the restoring force imparting part is slidable, and is attached to the handle or ring or hit point of the first half of the scissors. Characteristic scissors or an assisting force imparting tool.
In the scissors or assisting force imparting tool according to any one of claims 1 to 8,
a stranded wire in which one end of the sliding portion is fixed to the finger ring of the first scissors half and the other end is connected to a part that slidably supports the other end of the restoring force applying portion; A pair of scissors or an assisting force imparting tool further comprising a link arm mechanism component or a roller mechanism component.
The scissors according to any one of claims 1 to 9,
The scissors, wherein the first half of the scissors and the sliding portion, and the second half of the scissors and the supporting and fixing portion are integrally formed.
a shearing tool,
a first shear tool half;
a second shearing tool half;
a pivotal support that rotatably connects the first shearing tool half and the second shearing tool half;
an assisting force imparting portion that imparts an assisting force to the cutting by the first shearing tool half and the second shearing tool half;
with
The assist force applying section is
a restoring force imparting portion having one end and the other end and having a restoring force due to elastic deformation ;
a support fixing portion that supports one end portion side of the restoring force applying portion and is fixed to the pivot portion or the second shearing tool half;
a sliding part that slidably supports the other end of the restoring force applying part and is fixed to the first shearing tool half,
The restorative force imparting portion is configured such that when the handles of the first shearing tool half and the handle of the second shearing tool half are opened , the other end side of the restoring force imparting portion slides on the sliding portion to provide an elastic force. A shearing tool that is deformed so that a restoring force acts upon it when it is closed.

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