JP4340838B2 - Wire cutting tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention cuts a covered electric wire for facilitating the cutting of a covered electric wire installed on a power pole in distribution line construction, the cutting of an extra length portion, and the cutting of the covered electric wire on the ground at a connecting point between the covered electric wires. The present invention relates to a wire cutting tool.
[0002]
[Prior art]
Conventionally, an electric wire cutting tool is used for cutting a covered electric wire installed on a power pole in a suspended state or cutting an extra length portion for connecting electric wires, and a connecting part is attached thereafter. There are various types of wire cutting tools used for this cutting work, such as manual wire cutting tools, clippers, or wire cutting tools that are operated by connecting to an electric or hydraulic power source. Cutting work was performed at the cutting point on a pole such as a utility pole.
[0003]
Also, in recent years, indirect hot-wire work has been promoted due to uninterruptible power distribution work, and when the covered wire to be installed on the utility pole is cut in a suspended state or when the extra length is cut and connected for mutual connection In many cases, the work is performed in a state where electricity is passed through the adjacent covered electric wire. The applicant has also developed a wire cutting tool for this purpose (see Patent Document 1). According to the present invention, it is possible to ensure the electrical safety distance and confirm the cutting point.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 8-163728
[Problems to be solved by the invention]
However, it is necessary to save labor, reduce the work, and prevent the fall of the covered electric wire in the cutting work of the covered electric wire because of social demands, and the covered electric wire with the minimized work space while improving the safety of the work is required. Development of cutting tools is desired.
[0006]
In view of the above points, the present invention can perform the cutting operation on the pole, such as a utility pole, or on the ground, saving labor, reducing work, minimizing the work space, and preventing the cut covered electric wire from falling. An object of the present invention is to provide a wire cutting tool that can improve safety.
[0007]
[Means for Solving the Problems]
The invention of claim 1 is an electric wire cutting tool for cutting a covered electric wire installed on a power pole in distribution line construction, cutting an extra length at a connecting portion between the covered electric wires, and cutting the covered electric wire on the ground . ,
A connecting portion having a connecting shaft connected to an external manual operation rod or a rotational power source, a holder driven by the connecting shaft and moving up and down on the extension of the axis of the connecting shaft, and a base end portion of the handle portion An upper blade that is pin-coupled on the center line of the connecting portion and has a blade edge at the other end, and a lower blade that is pin-coupled at the upper end of the handle and has a blade edge at the other end. In the electric wire cutting tool in which the handle portion of the upper blade and the handle portion of the lower blade are intersected, and the intersection is pin-coupled by a blade fulcrum pin,
Between the connecting shaft and the holder, a screw shaft side is connected to the connecting shaft and a nut screw side is connected to the holder.
The length from the blade fulcrum pin of the lower blade handle to the pin coupling point is shorter than the length from the blade fulcrum pin to the pin coupling point of the upper blade handle .
[0008]
According to the second aspect of the present invention, the wire cutting tool body is frictioned to prevent transmission of excessive power when an excessive force is manually input from the outside or when the material of the covered wire conductor to be cut is hard. It is characterized in that a constant torque limiter by a mechanism is provided in the connecting portion.
[0009]
The invention of claim 3 is characterized in that it includes a pair of gripping mechanisms for gripping the cut covered electric wire on the unfixed side or the extra length side when the covered electric wire is cut.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a wire cutting tool according to the present invention. Moreover, FIG. 2 is explanatory drawing which shows the right side surface of a wire cutting tool, and a manual connection rod. FIG. 3 is a right side sectional view of the wire cutting tool.
[0011]
At the lower end of the wire cutting tool 1, there is provided a connection fitting 8 to which a manual operation rod can be inserted and connected. The rotational power of the manual operation rod 27 is transmitted to the connection shaft 7 and rotates around the shaft. .
[0012]
Then, although those required excessive cutting output when the material of the covered electric wire to or when cutting the excessive force is input from the manual operation rod 27 is rigid, whereby the wire cutting tool 1 itself and blades to prevent damage, is provided a constant torque limiter 9 by the friction mechanism such excessive force is not transmitted, the transmission unit 7a for transmitting the rotational force of the connecting shaft 7 to the ball screw 10 is transmission shaft.
[0013]
Then, by rotating the connecting shaft 7 with a normal force , the ball screw 10 rotates, and the nut 11 screwed into the ball screw 10 via a ball (not shown) moves up and down. The ball screw 10 and the nut 11 are formed with a general triangular or trapezoidal thread, and are not so-called sliding friction, and a spherical shape ( not shown) is formed between the ball screw 10 and the nut 11. A rolling friction system with balls is adopted. The screw pitch is longer than a general pitch, and the ball screw 10 cuts the covered electric wire by sliding the nut 11 in the vertical direction with a low rotational force and a low rotational speed.
[0014]
Next, these ball screw 10, and a ball (not shown), consisting of a nut 11 Prefecture, a pair of holders 12 is disposed on the upper surface of the ball screw mechanism 3 is sliding portion, the distal end of the holder 12, The base end portion of the handle portion 30 is pin-coupled by the holder pin 13 , and the lower blade 16 having the blade edge 18 at the other end portion is pin-coupled in a state where the upper blade 15 and a blade fulcrum pin 17 described later intersect.
[0015]
As shown in FIGS. 1 and 3, the base end portion of the handle portion 14 is connected to the both sides of the ball screw mechanism portion 3 by a link pin 19 on the center line of the connecting portion 2, and the blade edge is connected to the other end portion. An upper blade 15 having 18 is pin-coupled in a state where the lower blade 16 and the blade fulcrum pin 17 intersect each other. Therefore, the upper blade 15 and lower blade 16, it is possible to open and close move as a fulcrum blade fulcrum pin 17 by the vertical movement of the holder 12, becomes possible to cut the coated wire in the pair of blades 15, 16.
[0016]
In this way the present invention, can cut the covered wire with a pair of cutting edges due to the opening and closing of the upper blade 15 and lower blade 16 by the vertical movement of the holder 12 which is interposed a ball screw mechanism 3 described above, and for weight reduction The link mechanism portion 4 is provided, and the distance between the blade fulcrum pin 17 and the holder pin 13 is made longer than the distance between the blade fulcrum pin 17 and the blade tip 18 in order to reduce the cutting force.
[0017]
A clamp guide 20 is installed on each side surface of the upper blade 15 and the lower blade 16, and a clamp 22 that slides through a through hole of the clamp guide 20 is installed. The clamp 22 is urged by a spring 21 in a direction to be in an open state.
[0018]
The wire gripping portion 6 composed of the clamp 22 and the clamp guide 20 simultaneously opens and closes the upper blade 15 and the lower blade 16, and the spring 21 contracts corresponding to the outer diameter of the covered wire so that the clamp 22 holds the covered wire. However, the covered electric wire is prevented from being detached after cutting.
[0019]
FIG. 4 is a right side view showing a state in which a pair of blades of the wire cutting tool is closed.
[0020]
A state in which the connecting shaft 7 of the wire cutting tool is rotated and the ball screw mechanism 3 and the holder 12 are lowered, that is, a pair of clamps 22 installed on the side surfaces of the pair of upper blades 15 and lower blades 16 are closed. Show.
[0021]
5 and 6 are a front view and a right side view showing a state where the covered electric wire is inserted into the electric wire cutting tool body, and then the covered electric wire is cut and the covered electric wire is held and fixed to the pair of electric wire gripping portions 6. . As shown in the figure, the wire is cut in advance so that the extra length portion side comes to the wire gripping portion 6 side in advance.
[0022]
7 is a front view of a half section showing the shape of the blade portion of the wire cutting tool, FIG. 8 is a right side view of the blade portion of the wire cutting tool, and FIG. 9 is a perspective view of the cut surface of the covered wire cut by the wire cutting tool. FIG.
[0023]
The hatched portion in FIG. 7 shows the shape of the AA cutting portion of the lower blade 16 shown in FIG. 8, by providing a flat portion 23 at the tip, making the cutting angle 24 an acute angle, and providing a relief 25, In order to cope with the hard material of the covered electric wire, the difference between B and C of the electric wire shown in FIG.
[0024]
In addition, it cannot be overemphasized that various embodiment can be taken in the range which does not deviate from the meaning of this invention. In the above embodiment, the manual operation rod 27 is connected to the connecting shaft 7. However, the present invention is not limited to this, and the electric rotary tool and the connecting shaft 7 can be connected. In addition, the wire cutting operation can be performed safely by covering the ball screw mechanism 3 and the link mechanism 4 of the above-described wire cutting tool with the insulating cover 26.
[0025]
【The invention's effect】
The invention of claim 1 is explained with reference numeral used in the description of the embodiment described below, a cutting covered wire which is bridged utility pole (28) in the distribution line construction, covered electric wire (28) mutually A wire cutting tool (1) for cutting off the extra length at the connection point and cutting the covered wire (28) on the ground,
A connecting part (2) having a connecting shaft (7) connected to an externally operated manual operation rod (27) or a rotational power source, and an extension of the axis of the connecting shaft (7) driven by the connecting shaft (7) An upper blade having a holder (12) that moves up and down, a pin (19) coupled to the base end of the handle (14) on the center line of the connecting portion (2), and a blade edge (18) at the other end (15) and a lower end (16) having a base end of the handle (30) coupled to the pin (13) at the upper end of the holder (12) and having a cutting edge (18) at the other end, The wire cutting tool in which the handle (14) of the upper blade (15) and the handle (30) of the lower blade (16) intersect with each other, and the intersection is pin-coupled by a blade fulcrum pin (17) In (1),
A ball screw having a screw shaft (10) side connected to the connection shaft (7) and a nut side (3) connected to the holder (12) between the connection shaft (7) and the holder (12). While interposing the mechanism part (3), the length from the blade fulcrum pin (17) to the pin (13) coupling point of the handle part (30) of the lower blade (16) is set to the length of the upper blade (15). Since it is characterized in that it is shorter than the length from the blade fulcrum pin (17) to the pin (19) coupling point of the handle (14), it is easy to check the working point and temporarily suspend it on the covered wire can do.
[0026]
According to the invention of claim 2, excessive power is transmitted to the main body of the wire cutting tool (1) when an excessive force is manually input from the outside or when the material of the covered wire conductor (29) to be cut is hard. In order to prevent this, the connecting portion (2) is provided with a constant torque limiter (9) by a friction mechanism, so that the wire cutting tool body and the blade can be prevented from being damaged.
[0027]
The invention of claim 3 is provided with a pair of gripping mechanisms (6, 6) for gripping the uncovered or excess length of the covered covered wire (28) when cutting the covered wire (28). Therefore, the covered electric wire can be prevented from falling, and the safety of work on a pole such as a utility pole can be improved.
[Brief description of the drawings]
FIG. 1 is a front view showing a wire cutting tool according to the present invention.
FIG. 2 is an explanatory view showing a right side surface of a wire cutting tool and a manual connecting rod.
FIG. 3 is an explanatory view including a right side surface and a partial cross section of the wire cutting tool.
FIG. 4 is an explanatory view showing a right side surface in a state where a pair of blades of the wire cutting tool is closed.
FIG. 5 is a front view showing a state in which a covered electric wire is held and fixed to an electric wire cutting tool.
FIG. 6 is a right side view showing a state in which a covered electric wire is gripped and fixed to an electric wire cutting tool.
FIG. 7 is a front view including a partial cross section of the shape of the lower blade of the wire cutting tool.
FIG. 8 is a right side view of the lower blade of the wire cutting tool.
FIG. 9 is a perspective view showing a cut surface of a covered electric wire cut by an electric wire cutting tool.
[Explanation of symbols]
1 Wire cutting tool 2 Connecting part 3 Ball screw mechanism part ( sliding part )
4 Link mechanism part 5 Blade part 6 Electric wire gripping part 7 Connection shaft 8 Connection bracket 9 Torque limiter 10 Ball screw ( transmission shaft )
11 Nut 12 Holder 13 Holder pin 14 Handle 15 Upper blade 16 Lower blade 17 Blade fulcrum pin 18 Blade tip 19 Link pin 20 Clamp guide 21 Spring 22 Clamp 23 Flat portion 24 Cutting angle 25 Escape portion 26 Insulating cover 27 Manual operation rod 28 Cover Electric wire 29 Electric wire (conductor)
30 handle

Claims (3)

And cutting the covered electric wire is bridged utility poles in distribution line construction, a wire cutting tool for cutting the covered electric wire in the cutting and ground elongated portion in the connecting portion covered wires cross,
A connecting portion having a connecting shaft connected to an external manual operation rod or a rotational power source;
A holder driven by the connecting shaft and moving up and down on an extension of the axis of the connecting shaft;
An upper blade having a base end portion of the handle portion pin-coupled on the center line of the connecting portion and having a blade edge at the other end portion;
A base end portion of the handle portion is pin-coupled at the upper end portion of the holder, and a lower blade having a cutting edge at the other end portion,
In the electric wire cutting tool in which the handle portion of the upper blade and the handle portion of the lower blade are intersected, and the intersection is pin-coupled by a blade fulcrum pin,
Between the connecting shaft and the holder, a screw shaft side is connected to the connecting shaft and a nut screw side is connected to the holder.
An electric wire cutting tool , wherein a length from a blade fulcrum pin to a pin coupling point of the handle portion of the lower blade is shorter than a length from a blade fulcrum pin to a pin coupling point of the handle portion of the upper blade .   A constant torque limiter using a friction mechanism is connected to the wire cutting tool body to prevent transmission of excessive power when external force is input manually or when the material of the coated wire conductor to be cut is hard. The electric wire cutting tool according to claim 1, wherein the electric wire cutting tool is provided in a portion.   The wire cutting tool according to claim 1 or 2, further comprising a pair of gripping mechanisms for gripping the uncovered or excess length of the covered covered wire when the covered wire is cut.

Images