JPH11313992A - Protector for cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protector for a cutter which achieves a securing of the safety of workers and a prevention of the breakage of an electric wire or the like arranged without significant modification of the conventional cutter. SOLUTION: This protector comprises a protective means which comprises a pair of shutters 15A and 15B shrouded on individual edge parts of scissor- shaped blades of a cutter CT, support shafts 17a or the like rotatably pivoted in the direction the same as the direction of opening or closing the scissor- shaped blades of the cutter CT and with respect to the scissor-shaped blades and energizing means 18a, 18b, 18c and 18d to always energize the protective means in the direction of closing. The protector comprises a protective means to cover one edge part of the scissor-shaped blades of the cutter CT, a support shaft to rotatably pivot the protective means in the direction the same as the direction of opening or closing the scissor-shaped blades and with respect to the edge part and an energizing means to always energize the protective means in the direction of closing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device mounted on a cutting tool for cutting an object to be cut such as an electric wire used in power distribution work or the like with a scissor blade.

[0002]

2. Description of the Related Art Conventionally, various cutting tools have been proposed according to the size of a wire diameter and the type of a driving source when a wire or the like is cut by a scissor blade in power distribution work.

[0003] A cutting tool capable of cutting a large-diameter electric wire or the like generally uses a hydraulic drive as a drive source, and the hydraulic drive source opens and closes a scissor-like cutter portion through the interposition of a piston and a link mechanism. This is a mechanism for performing cutting. The piston is provided with a return spring that constantly urges the cutter portion in the opening direction, thereby facilitating insertion of an electric wire or the like into the cutter portion.

[0004]

However, although this cutting tool makes it easy to insert an electric wire or the like into a cutter portion, a sharp blade portion is formed at the cutter portion, so that the cutting tool is difficult for an operator. Depending on carelessness, accidents such as injuries may occur due to contact with such blades, and due to careless handling of the tool, wired wires etc. may be damaged by the blades. . Therefore, the present invention is intended to prevent such a situation, and it is possible to ensure the safety of workers and prevent the damage of the wired wires and the like without making a significant improvement to the conventional cutting tool. Another object of the present invention is to provide a protection device for a cutting tool.

[0005]

According to the present invention, there is provided a protective device mounted on a scissor blade of a cutting tool for cutting an object to be cut such as an electric wire. Protection means comprising a pair of shutters provided on each blade portion of the scissor blade, and turning the protection means in the same direction as the opening and closing direction of the scissor blade of the cutting tool and with respect to the scissor blade. A protection device for a cutting tool, comprising: a support shaft that is movably supported; and a biasing unit that constantly biases the protection unit in a closing direction.

Further, the pair of shutters of the protection means has an insertion portion for facilitating insertion of the object to be cut at one end portion, and a holding recess for holding the object to be cut inside opposing both side portions. And one end of the urging means is fixed.

Preferably, the protection means includes a lock mechanism for preventing the pair of shutters from opening and closing.

[0008] More preferably, the protection means is provided with a pair of protection covers provided outside the pair of shutters and operated in conjunction with the shutters.

Further, the protective cover has an insertion portion for facilitating insertion of the object to be cut at one end portion, and a holding concave portion for holding the object to be cut inside the opposing side surfaces. .

According to the present invention, there is provided a protection device mounted on a scissor blade of a cutting tool for cutting an object to be cut such as an electric wire, wherein one of the scissor blades of the cutting tool is connected to the scissor blade. Protective means for covering, a support shaft for pivotally supporting the protective means in the same direction as the opening / closing direction of the scissor blade and rotatably with respect to the blade portion, and constantly urging the protective means in the closing direction And a protection device for a cutting tool, comprising:

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a protection device for a cutting tool according to the present invention having such a configuration will be described with reference to the accompanying drawings.

FIG. 1 is a plan view of a protection device for explaining an embodiment of a protection device for a cutting tool according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. FIG. 4 is a sectional view showing a case where the tool has completed the cutting operation, FIG. 4 is an exploded perspective view of the protection device for the cutting tool, FIG. 5 is an explanatory diagram of the operation state of the protection device, FIG. (B) is an explanatory view showing a state in which the object is gripped, and (c) is an explanatory view showing a state in which the object has been completely cut.

The protection device 1 of the cutting tool CT shown in FIGS. 1 to 4 is provided with a protection means, and the protection means is an upper cutter 30 which is a scissor-shaped blade at each of the upper and lower sides of the cutting tool CT.
A and a pair of upper and lower shutters 15A and 15B mounted on the outer peripheral portion of the lower cutter 30B, and a pair of upper and lower protective covers 10A and 10B provided outside these shutters. Specifically, as shown in FIG.
The shutters 15A and 15B for externally mounting the support shafts 17a, 17b, and 1 on a pair of left and right support plates 16A and 16B.
While being rotatably supported by 7c and 17d,
Shutter springs 18a, 18b, 1
8c and 18d always urge in the closing direction. The pair of left and right support plates 16A and 16B are configured so as to sandwich the upper cutter 30A and the lower cutter 30B of the cutting tool CT with a spacer 20A interposed therebetween.

The respective components of the protection device 1 for the cutting tool CT configured as described above will be specifically described.

Shutters 15A, 15B above and below the protection means
As shown in FIG. 4, the shape in plan view is formed as a substantially concave shape, and a chamfering process is performed on a concave base portion to facilitate insertion of the workpiece W. Inserted portion 15a is formed. Inside the left and right side surfaces of the shutters 15A and 15B, that is, inside the opposing side surfaces of the respective shutters, a holding concave portion 15b for holding an object to be cut is formed.
Outside the shutters 15A and 15B, a shutter 15 is provided.
A, a protective cover 10 having a shape engaging with the outer shape of 15B
A and 10B are externally provided, and this protective cover 10A,
10B, the insertion portion 10a and the holding recess 1 similar to the insertion portion 15a and the holding recess 15b of the shutters 15A and 15B are also provided.
0b is formed.

A pair of upper and lower shutters 15A and 15B have support shafts 17a, 17b, 17c and 17d, respectively.
A and 15B penetrate through holes 15d formed in the support plates 16A and 16B and fixed holes 16 formed in the support plates 16A and 16B.
By being screwed and fixed to a, it is rotatably supported by the shaft.

Further, both ends of shutter springs 18a, 18b, 18c, 18d forming a pair up and down are fixed to left and right side surfaces of the shutters 15A, 15B and the support plates 16A, 16B by fixing bolts 19, respectively. The bias for the rotation of the shutters 15A and 15B in the opening direction, that is, the bias in the closing direction is performed.

The application of the urging force by the shutter spring 18a to the rotation of the shutter 15B will be described taking the shutter spring 18a as an example. One end of the shutter spring 18a is fixed to the support plate 16B by a fixing bolt 19. I have. On the other hand, the other end of the shutter spring 18a is fixedly inserted through a perforated hole 15e formed in the shutter 15B so as to freely rotate. That is, with the support shaft 17c as the rotation axis, the shutter 15B
When the shutter 15B is rotated in the downward direction, the shutter spring 18 is rotated with the rotation of the shutter 15B.
a expands, and conversely, a contraction force is generated in the shutter spring 18a. Therefore, the shutter 15B
The biasing force, which is the retracting force, is always applied by the shutter spring 18a in the upward direction of the arrow shown in the drawing.

Although the shutter spring 18a of the shutter 15B has been described as an example, the other shutter springs 18b, 18c, and 18d operate in the same manner as the shutter spring 18a, and therefore, these shutter springs 18b, 18c, and 18d are used. Also acts on the shutters 15A and 15B to apply an urging force.

As shown in FIG. 1, in the protection device 1 for the cutting tool CT having the above-described structure, the spring pins 40A and 40B projecting in the left-right direction of the cutting tool CT are attached to the support plate 16.
By being penetrated through the through holes 16d, 16d of A, 16B and the through hole 20a of the spacer 20A, they are sandwiched and provided.

FIGS. 5 and 2 show the operation of cutting the object W such as an electric wire by the protection device 1 of the cutting tool CT described above.
The description will be made based on FIGS. 5A and 5B are explanatory diagrams of the operation state of the protection device 1. FIG. 5A illustrates a state before the operation is started, FIG. 5B illustrates a state in which the workpiece W is gripped, and FIG. It is an explanatory view showing a state where cutting has been completed.

(1) State before the start of operation of the protection device 1 In this state, the cutting tool CT of the scissors blade is, as shown in FIG. 2, hydraulic oil from a hydraulic pipe 41 connected to the cylinder 34 of the cutting tool CT. Is not supplied, that is, the piston head 35a is not pressed by the hydraulic oil. Accordingly, the return spring 36, which is provided on the piston 35 in the cylinder 34, remains in the extended state because the hydraulic oil is not supplied from the hydraulic pipe 41.
The upper cutter 30A and the lower cutter 30B connected to the slide head 38 and the link mechanism 37 on the other end side opposite to the above also have their scissor blades in the open state.

The main body of the upper cutter 30A and the lower cutter 30B in such a state is provided with spring pins 40A, 40B projecting in the left-right direction. The spring pins 40A, 40B are connected to the support plate 16A of the protection device 1. , 1
By passing through the through holes 16d, 16d of 6B and the through hole 20a of the spacer 20A, the protection device 1 itself is sandwiched by the cutting tool CT as shown in FIG. 5 (a) and FIG. Before starting the operation of the protection device 1,
As described above, the shutter springs 18a, 18b, 18
shutters 15A, 15B by the urging force of c, 18d
Since the closed state is maintained, the fingers of the workers and the wired electric wires during the power distribution work do not directly contact the blades of the upper cutter 30A and the lower cutter 30B.

(2) State in which the protection device 1 grips the object W In the state before the operation of the protection device 1 described above, the object W is protected by the protective covers 10A and 10B (shutters 15A and 15B).
15B) after being brought into contact with the insertion portion 10a (15a).
As shown in FIG. 5B, the shutter springs 18a,
The protection device 1 is inserted into the protection device 1 against the urging forces of 18b, 18c, and 18d. The object W to be cut is inserted into the protective cover 10.
A, 10B of gripping recess 10b and shutters 15A, 1B
The position of the protection device 1 is reliably determined by the holding recess 15b of 5B. Note that even when the workpiece W is gripped by the protection device 1 and the position is determined, the cutting tool CT
The upper cutter 30A and the lower cutter 30B remain in the open state, and therefore, the workpiece W is not damaged by the blades of the upper cutter 30A and the lower cutter 30B.

(3) State from cutting of the object W to completion of cutting When the above-mentioned protection device 1 is in a state of gripping the object W, hydraulic oil is supplied to the hydraulic pipe 41 as shown in FIG. By operating an operation valve (not shown), the piston head 35a moves forward against a return spring 36 provided on the piston 35, and further, an upper cutter 30A and a lower cutter 30 connected to the slide head 38 via a link mechanism 37. By setting 30B to the closed state, the workpiece W is cut. Even in this state, as shown in FIG. 5 (c), the protection device 1 holds each of the divided objects W by the holding recesses 10b of the protection covers 10A and 10B and the holding recesses 15b of the shutters 15A and 15B. Maintain state. When the cutting is completed, operate the operation valve again,
The piston head 35a is combined with the urging force of the return spring 36.
To the state before the start of cutting. Then, each cut object W is detached from the protection device 1 to complete the cutting operation.

As shown in FIG. 4, a fixing bar 21a formed in a U-shape is provided on one side of the protective cover 10B.
The lock mechanism has one end of the fixed bar 21a inserted into the through hole 10c of the protective cover 10B and the through hole 15c of the shutter 15B, and the other end thereof is pushed through the spring 21b. The fixing bar 21a is made rotatable by being fixed by the push washer 21c. Therefore, when the cutting tool CT is not used, the fixed bar 21
By inserting another end different from the rotating part a into the through hole 10c of the protection cover 10A, the protection cover 10A and the protection cover 10B are fixed.

In consideration of the fact that the protective covers 10A and 10B are cutting tools CT used for power distribution work,
By using an insulating material, it is possible to prevent a short circuit accident between the electric wires and a ground fault accident. In addition, the outer periphery of the cutting tool CT provided with the protection device 1 is made of insulating rubber or the like. If the cover C is in the form of foreskin, it goes without saying that the safety of the worker can be additionally achieved.

Next, a protection device for a cutting tool according to another embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 6 is a plan view of a cutting tool provided with a protection device according to another embodiment of the present invention, and FIG.
8 is a detailed view showing a shutter of the protection device of FIG. 6, wherein FIG. 8A is a plan view of the shutter, and FIG. 8B is a side view of the shutter. FIGS. 9A and 9B are views showing a scissor-like blade portion of the cutting tool to which the protection device of FIG. 6 is attached. FIG. 9A is a side view showing a state before the start of operation, and FIG. It is.

The protection device 51 of the cutting tool CT according to the present embodiment is described as being mounted on the outer peripheral portion of the upper cutter 30A among the upper cutter 30A and the lower cutter 30B constituting the scissor blades of the cutting tool CT. However, it is also possible to use a device mounted on the lower cutter 30B. The protection device 51 includes the upper cutter 3 of the cutting tool CT.
A protection means including a shutter 65 provided on the outer cutter 0A; a support shaft 67 for rotatably supporting the protection means in the same direction as the opening and closing directions of the upper and lower cutters 30A and 30B and rotatably with respect to the upper cutter 30A; Biasing means comprising a shutter spring 68 for constantly biasing the means in the closing direction. The cutting tool CT to which the protection device 51 is attached is the same tool as described above. As shown in FIG. 9, the support shaft of the scissor blade is covered with a cover plate 70.

As shown in detail in FIGS. 8A and 8B, the shutter 65 has a protection section 65A having a U-shaped cross section that covers the upper cutter 30A of the cutting tool CT, and an outer side from the base end of the protection section 65A. And a pair of parallel mounting portions 65B protruding from the through hole 65 through which the support shaft 67 passes.
a are provided at opposing positions. Shutter 65
The protection portion 65A has a U-shaped cross section including two side surfaces and an upper surface connecting these side surfaces. Protection section 65A
Has a curved surface that matches the curved surface of the back of the upper cutter 30A. When the side surface of the protection portion 65A is in the closed position (see FIG. 9A), the upper cutter 3
It has a shape that covers 0A and abuts a corner portion of the cover plate 70. In addition, in order to facilitate insertion of an object to be cut such as an electric wire, a side surface of the protection portion 65A has a curved shape at a portion of the cutting tool CT located at the insertion site of the object to be cut W. The shape of the shutter 65 is not limited to the illustrated example, and may be any shape as long as it covers the blade of the upper cutter 30A in the closed position. Accordingly, the shape of the protection device 51 may be appropriately determined according to the shape of the cutter of the cutting tool CT to which the protection device 51 is mounted and the shape of the spindle portion of the cutter.

The support shaft 67 for rotatably supporting the shutter 65 with respect to the upper cutter 30A is constituted by members such as screws and pins. In the present embodiment, as shown in FIG. 6, a screw is inserted from the outside of each through hole 65a provided opposite to the pair of mounting portions 65B of the shutter 65,
By screwing the ends of these screws to the cover plate 70 at a position close to the support shaft of the upper cutter 30A, the support shaft 6
7. However, the support shaft 67 may have any configuration as long as it supports the shutter 65 in the same direction as the opening and closing direction of the upper cutter 30A and is rotatable with respect to the upper cutter 30A. For example, instead of screwing the screws, projections may be provided on both sides of the cover plate 70, and the support shaft 67 may be configured using a pivot pin fitted to these projections. The support shaft 67 is positioned between the cutting tool CT and the insertion portion of the workpiece W formed between the scissor blades.
Is preferably attached to the cover plate 70 on the tool body side, but the position is not limited as long as the shutter 65 can be opened and closed smoothly.

A coil spring, a leaf spring, or the like can be used as the shutter spring 68 that constantly biases the shutter 65 in the closing direction. In the present embodiment, the shutter spring 68 is a pair of torsion springs interposed between each mounting portion 65B of the shutter 65 and the support shaft 67 (see FIG. 6).
And One end of the shutter spring 68 is locked inside the mounting portion 65B of the shutter 65, and the other end is locked by the cover plate 70 of the cutting tool CT, and constantly biases the shutter 65 in the closing direction. In this embodiment, in order to reduce the weight and size of the protection device 51, the shutter spring 68 is a torsion spring interposed between the mounting portion 65B of the shutter 65 and the support shaft 67, but the shutter 65 is always closed. Any shape and attachment position may be used as long as the position can be urged. For example, the shutter spring 18a used in the protection device 51 described above is used.
Alternatively, the shutter may be attached from the outside of each attachment portion 65B of the shutter 65 using the same spring as in 18d.

The protection device 51 includes a mounting portion 6 for the shutter 65.
5B, the support shaft 6 extends from the outside of the facing through hole 65a
7 are inserted into the cover plate 70 through a torsion spring as a shutter spring 68.
The screw is attached to the cutting tool CT. As shown in FIGS. 6 and 9, the shutter 65 is rotatable about the support shaft 67 with respect to the upper cutter 30 </ b> A, and the direction of rotation is the opening / closing direction of the scissor blades, ie, the upper cutter 30 </ b> A and the lower cutter 30 </ b> B. And the same direction. One end of the shutter spring 68 inserted between the pair of mounting portions 65B of the shutter 65 and the support shaft 67 is locked inside the mounting portion 65B of the shutter 65, and the other end is locked to the cover plate 70 of the cutting tool CT. And holds the shutter 65 at the closed position. Therefore, when the shutter 65 is rotated from the closed position to deform the shutter spring 68, a restoring force is generated in the shutter spring 68 to return to the original shape, so that the shutter 65 is always biased in the closing direction. Will be.

The operation of the above-described protection device 51 when mounted on the cutting tool CT will be described with reference to FIG. First, as shown in FIG. 9 (a), when the scissor-like blade composed of the upper cutter 30A and the lower cutter 30B is open, the protection portion 65A of the shutter 65 covers the blade portion of the upper cutter 30A and the scissors. It occupies almost the entire area of the insertion site of the workpiece W formed between the blades. The protection portion 65A has a curved surface whose upper surface matches the outer shape of the back of the upper cutter 30A, and has a shape in which both side surfaces abut the corners of the cover plate 70 of the cutting tool CT.
The shutter 65 is accurately positioned at the closed position with the scissors blade open.

As shown in FIG. 9B, when an object W such as an electric wire is inserted between the scissor blades, the shutter 65 rotates about the support shaft 67 in the direction of the arrow. Shutter 65
The protection portion 65A has a curved surface at a portion facing the lower cutter 30B, so that the workpiece W can be easily inserted. The workpiece W is moved to the protection portion 65 of the shutter 65.
When the shutter 65 is brought into contact with the tip A and slid along the curved surface in the direction of the support shaft of the scissor blade, the shutter 65 rotates about the support shaft 67 in the direction of the arrow with respect to the upper cutter 30A. In this rotation position, the shutter 65 receives the urging force of the shutter spring 68. Even when the workpiece W is gripped between the scissors, the blade of the upper cutter 30A is covered with the shutter 65 and is hardly exposed, so that the worker may be injured by the exposed blade. There is no.

Next, the workpiece W is cut by operating the upper cutter 30A and the lower cutter 30B while holding the workpiece W between the scissor blades. When the piston head 35a of the piston 35 pressed by the hydraulic oil flowing from the hydraulic circuit slides against the return spring 36 in the cylinder 34 provided in the tool body of the cutting tool CT, the slide head 38 moves forward. Then, the upper cutter 30A and the lower cutter 30B connected to the slide head 38 via the link mechanism 37 rotate in the closing direction about the support shaft (see FIG. 7). The workpiece W is cut by this rotation.

When the cutting of the workpiece W is completed, the hydraulic oil flows out of the cylinder 34, and the piston head 35a moves backward by the urging force of the return spring 36. Accordingly, the slide head 38 also retreats, and the upper cutter 30A and the lower cutter 30B connected to the slide head 38 via the link mechanism 37 rotate about the support shaft in the opening direction (FIG. 7).
reference). At this time, unlike the rotational movement of the upper cutter 30A, the shutter 65 rotates in the closing direction by the urging force of the shutter spring 68. The pivoting movement of the upper cutter 30A and the lower cutter 30B in the opening direction ends, and the shutter 65
Is returned to the closed position, the cutting operation is completed, and the protection device 5
1 and the cutting tool CT return to the state shown in FIG.

In such a protective device 51, even if the scissors blade of the cutting tool CT is open, the shutter 6
Since the protection portion 65A of No. 5 covers almost the entire area of the insertion portion of the object W to be cut formed between the scissor-shaped blades, the exposed blade portion may injure the worker or break the wired wires and the like. No more. Also, the shutter 65 of the protection device 51
Is urged in the closing direction by the shutter spring 68, so that the object W is brought into contact with the tip of the protection portion 65a of the shutter 65 and the shutter 65 is opened unless the shutter 65 is rotated against the urging force. Never. Therefore, there is no possibility that the worker may injure himself by inserting his finger or the like between the scissor blades. Further, since the protection device 51 is mounted on only one of the scissor blades, the intended purpose can be achieved with a simpler configuration than the protection device 1 described above. Further, since the shutter 65 serving as the protection means can be formed to be narrow, there is an advantage that the electric wire can be cut near the insulator when used for power distribution work.

As for the protection device 51 in this embodiment, similarly to the protection device 1 described above, in consideration of the fact that the cutting tool CT is a tool used for power distribution work, a short circuit accident between electric wires and a ground fault accident are considered. To prevent this, the shutter 65 can be made of an insulating material. In order to further enhance the safety, an insulating cover made of rubber or the like having an insulating property can be encased on the outer periphery of the cutting tool CT to which the protection device 51 is attached.

The cutting tool CT to which the protection devices 1 and 51 of the present invention are attached is composed of an upper cutter 30A and a lower cutter 3A.
Although the description has been made assuming that both OBs rotate around the support shaft, a tool in which one blade portion is a fixed blade and only the other blade portion rotates may be used.

[0042]

According to the apparatus for protecting a cutting tool according to the present invention described above, the following effects can be obtained. 1) The protection device can be mounted without significantly improving the conventional cutting tool. With such a protection device, since the blade portion of the cutting tool is constantly urged in the closing direction, it is possible to prevent accidents such as injuries due to careless contact with the sharp blade portion of the cutter portion. Become. 2) Further, careless handling of the cutting tool can prevent an accident that the wired electric wire or the like is damaged by the blade of the cutter.

[Brief description of the drawings]

FIG. 1 is a plan view of a protection device for explaining an embodiment of a protection device for a cutting tool according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a state where the cutting tool of FIG. 2 has completed a cutting operation.

FIG. 4 is an exploded perspective view of the protection device for the cutting tool.

5A and 5B are explanatory diagrams of an operation state of the protection device, wherein FIG. 5A shows a state before the start of operation, FIG.
(C) is an explanatory view showing a state in which the object has been completely cut.

FIG. 6 is a plan view of a cutting tool provided with a protection device according to another embodiment of the present invention.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

8 is a detailed view showing a shutter of the protection device of FIG. 6,
(A) is a plan view of the shutter, and (b) is a side view of the shutter.

9 is a view showing a scissor-like blade portion of the cutting tool to which the protection device of FIG. 6 is attached, wherein (a) is a state before the start of operation,
(B) is a side view showing a state where an object to be cut is inserted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protector 10A Protective cover 10B Protective cover 10a Insertion part (protective cover) 10b Holding concave part (protective cover) 15A Shutter 15B Shutter 15a Insertion part (shutter) 15b Holding concave part (shutter) 16A Support plate 16B Support plate 17a-d Support shaft 18a-d Shutter Spring 19 Fixing Bolt (Shutter Spring) 20A Spacer 21a Fixing Bar (Lock Mechanism) 21b Push Spring (Lock Mechanism) 21c Push Washer (Lock Mechanism) 30A Upper Cutter 30B Lower Cutter 31A Cutter Holding Plate (Upper) 31B Cutter Holding plate (lower part) 32 Cutter guide 33 Cylinder head 34 Cylinder 35 Piston 35a Piston head 36 Return spring 37 Link mechanism 38 Slide head 39 Set screw (Slide head) 40A Puringupin 40B spring pin 41 hydraulic pipe C insulating cover CT cutting tool W object to be cut 51 protective device 65 shutter 65A protective portion 65B mounting section 65a through holes 67 support shaft 68 the shutter spring 70 cover plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makoto Kobayashi 7148-5 Chubu Electric Power Co., Inc. 3-1-32 Minato-ku, Minato-ku Toenec Head Office Annex (72) Inventor Makoto Okuhara 3039 Sasaga, Matsumoto-shi, Nagano Prefecture Izumi Seiki Seisakusho Co., Ltd.

Claims (6)

[Claims] 1. A protection device attached to a scissor blade of a cutting tool for cutting an object to be cut such as an electric wire, comprising: a pair of shutters externally mounted on respective blade portions of the scissor blade of the cutting tool. A support shaft for pivotally supporting the protection means in the same direction as the opening / closing direction of the scissor blades of the cutting tool and rotatably with respect to the scissor blades; And a biasing means for biasing the cutting tool. 2. The pair of shutters each include an insertion portion for facilitating insertion of the object to be cut at one end portion, and a holding concave portion for holding the object to be cut inside opposing side surfaces of the shutter. The protection device for a cutting tool according to claim 1, wherein one end of the biasing means is fixed. 3. The protection device for a cutting tool according to claim 1, wherein the pair of shutters includes a lock mechanism for preventing opening and closing. 4. The cutting tool according to claim 1, further comprising a pair of protective covers provided outside the pair of shutters and operating in conjunction with the shutters. Protective equipment. 5. The protection cover according to claim 1, further comprising an insertion portion at one end portion for facilitating insertion of the object to be cut, and a holding concave portion for holding the object to be cut inside opposing side surfaces. The protection device for a cutting tool according to claim 4, wherein 6. A protection device mounted on a scissor blade of a cutting tool for cutting an object to be cut such as an electric wire, wherein the protection device covers one blade portion of the scissor blade of the cutting tool. A support shaft that rotatably supports the protection means in the same direction as the opening and closing direction of the scissor blade and rotatably with respect to the blade portion; and an urging means that constantly urges the protection means in the closing direction. A protection device for a cutting tool, comprising: