JP3244818U - Bending tool for electric wire - Google Patents

Abstract

An object of the present invention is to provide a bending tool for electric wires that can easily round-bend electric wires. A bending tool 1 for electric wires has a bending tool part 10 and a driver part 30, and the bending tool part 10 includes a base 11, a center pin 13 and a support pin protruding from a top surface 12 of the base 11. It is equipped with 14. An electric wire to be processed is inserted between a center pin 13 and a support pin 14 that protrude from the top surface 12 of the base 11, and the electric wire to be processed is bent along the center pin 13, thereby bending the electric wire into a desired shape. It is curved round in the inner meridian. [Selection diagram] Figure 1

Description

The present invention relates to a bending tool for electric wires, and more particularly to a bending tool for rounding the tip of an electric wire when screwing the wire.

When screwing an electric wire to the terminal fitting of an outlet or receptacle, generally, bend the tip of the wire into a circle, insert the screw shaft into the rounded hole, hold the wire with the screw head, and connect the wire to the terminal. Fix it to the metal fittings.

Conventionally, the work of bending the tip of an electric wire into a round shape has been performed using radio pliers or electrician pliers.
By the way, round bending of electric wires using radio pliers or the like requires time, experience, and skill. Therefore, there has been a desire for a tool that allows anyone to easily bend electric wires into circles.

Japanese Patent Application Publication No. 2006-110575 Japanese Patent Application Publication No. 09-164430

The problem to be solved by the present invention is to easily round-bend the tip of an electric wire into a desired shape.

In this invention, the wire to be processed is inserted between the center pin and the support pin that protrude from the top surface of the base, and the wire is bent to the desired internal diameter by bending the wire to be processed around the center pin. The above problem is solved by a bending tool for electric wires that can be bent into a round shape.

According to the present invention, by bending the wire around the center pin, it is possible to easily create a bent portion with a desired round internal diameter in the wire.
As a result, it is possible to easily screw the electric wire to a terminal fitting of an outlet, a terminal fitting of a receptacle, or the like.

FIG. 1 is a perspective view of an electric wire bending tool 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the electric wire bending tool 1 taken along II-II in FIG. FIG. 3 is a right side view of the electric wire bending tool 1. FIG. 4 is a diagram showing an example of an electric wire to be processed. FIG. 5 is a diagram showing an operation procedure for bending an electric wire using the bending tool section 10 of the electric wire bending tool 1 according to the present embodiment. FIG. 6 is a diagram showing an example of a roundly bent electric wire. FIG. 7 is a diagram illustrating how to correct a bent portion. FIG. 8 is a diagram showing the situation immediately before attaching the electric wire to the exposed outlet. FIG. 9 is a diagram showing how an electric wire is fixed with a screw using the electric wire bending tool 1. FIG. 10 is a perspective view of a wire bending tool 50 according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a perspective view of an electric wire bending tool 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the electric wire bending tool 1 taken along II-II in FIG. FIG. 3 is a right side view of the electric wire bending tool 1.

Referring to FIGS. 1 to 3, the electric wire bending tool 1 according to the present embodiment includes a bending tool section 10 and a driver section 30. The bending tool section 10 and the driver section 30 are connected back to back along the central axis CL and are integrated.

The bending tool section 10 includes a base 11 having a cylindrical shape that is short in the direction of the central axis CL, and a center pin 13 and a support pin 14 that protrude from the top surface 12 of the base 11. The base 11 and the center pin 13 are, for example, an integral body made of iron, and the tip side of the base 11 is machined, for example, so that the center pin 13 protrudes from the top surface 12 of the base 11 about the central axis CL. The base 11 has a diameter φ ₀ of, for example, 22 mm, and the center pin 13 has a diameter φ ₁ of, _for example, 4.0 _mm , and a height (length) h ₁ of the center pin ₁₃ . =8.0mm.

The reason why the diameter φ ₁ of the center pin 13 is set to φ ₁ =4.0 mm is because, as will be described later, by bending the wire to be processed along the center pin 13, the wire to be processed can be shaped as desired. This is to form a bent part of the inner meridian (sometimes called a "no-shaped bend" part). The diameter _φ1 of the center pin 13 may be larger or smaller than 4.0 mm, and may be set to a dimension other than 4.0 mm, depending on the inner diameter of the bent portion (dog-shaped bend) formed in the electric wire. may have been done.

The support pin 14 is made of stainless steel, for example, and is separate from the base 11, and the protrusion height (length) _h1 from the top surface 12 of the base 11 is the same as that of the center pin 13, _h1 = 8.0 mm. There is. The support pin 14 is provided parallel to the center pin 13, and the distance S between the support pin 14 and the center pin 13 is, for example, 1.62 mm. This interval S is set to allow insertion of an electric wire to be subjected to bending, which will be described later. Therefore, the interval S may be set to a dimension other than S=1.62 mm depending on the core wire thickness of the electric wire to be processed.

In this embodiment, the support pin 14 is a cylindrical spring formed by rolling a stainless steel plate in a direction perpendicular to the length direction, and is inserted into a hole 15 perpendicularly perpendicular to the top surface 12 of the base 11. It is formed by inserting a pin. The depth of the hole 15 into which the spring pin is inserted is, for example, 8 mm. Therefore, the base half of the support pin 14 (spring pin) is fitted into the hole 15 and fixed, and the tip half protrudes from the top surface 12. The support pin 14 does not wobble or rattle.

In addition, when the support pin 14 is a spring pin as mentioned above, it is desirable that the crack extending in the length direction of the spring pin faces the outside on the side opposite to the center pin 13.

In this embodiment, the center pin 13 protruding from the top surface 12 of the base 11 is formed integrally with the base 11, and the support pin 14 has its root part embedded in the base 11, and its tip side from the top surface 12. Although this is a protruding configuration, it is not limited to this configuration. In other words, if the center pin 13 and the support pin 14 are configured to protrude perpendicularly and parallelly from the top surface 12 of the base 11 with a predetermined interval S, how can the center pin 13 and the support pin 14 be made? It may be made of.

Further, in the present embodiment, the height h ₁ of the center pin 13 and the support pin 14 protruding from the top surface 12 is h ₁ =8.0 mm, but the height h 1 is not limited to this height. When the center pin 13 and the support pin 14 have a height h ₁ =8.0 mm, two workpiece electric wires are inserted between the center pin 13 and the support pin 14, and two workpiece electric wires are inserted at the same time. It is possible to perform round bending on utility wires.

However, if the electric wires to be processed are rounded one by one, the height _h1 of the center pin 13 and the support pin 14 may be lower than in this embodiment.
Furthermore, the heights of the center pin 13 and the support pins 14 can also be different.

A side surface of the base 11 includes a circumferential surface 16 in which a circumferentially extending slot 17 is formed. The groove width W of the slot 17 is, for example, W=1.8 mm. The slot 17 is for correcting the direction of the bent portion made on the electric wire (orientation of the bent portion with respect to the length direction of the electric wire). The details will be described later.

The driver section 30 includes a handle 31 and a driver shaft 32 protruding from the handle 31. The tip of the driver shaft 32 is preferably a + screwdriver. The driver section 30 is a known short-axis driver.

An end surface 18 of the bending tool section 10 opposite to the top surface 12 of the base 11 is connected to an end surface of the handle 31 opposite to the side from which the driver shaft 32 protrudes. In order to realize a strong connection, a threaded connection shaft 19 is provided on the end surface 18 of the base 11. The connecting shaft 19 is screwed into a screw hole extending in the direction of the central axis CL formed on the end surface of the handle 31 of the driver section 30, and the end surface 18 of the base 11 is brought into contact with the end surface of the handle 31, so that the bending tool section 10 It is connected and integrated with the driver section 30. Note that a thread locking agent may be applied between the threaded portion of the coupling shaft 19 and the threaded hole of the handle 31 in order to make the connection stronger.

FIG. 4 is a diagram showing an example of an electric wire to be processed. As the electric wire to be processed, a single conductor 23 called an IV electric wire is often used. The electric wire (conductor) 23 is usually covered with an insulating coating 24 made of polyethylene, vinyl chloride, or the like. The electric wire to be processed shown in FIG. 4 is a so-called VVF cable having a structure in which two IV electric wires 23 covered with an insulating coating 24 are covered with an insulating sheath 25. In FIG. 4, a conductor (wire) 23 covered with a gray insulation coating 24 indicates a live wire through which current flows, and a conductor (wire) 23 covered with a white insulation coating indicates a ground wire.

In order to round-bend an electric wire with the electric wire bending tool 1 according to the present embodiment, the sheath 25 at the tip of the electric wire to be processed is stripped off by about 40 to 45 mm, and the insulation coating of each IV electric wire is removed. 24 is stripped off by about 20 mm, for example. Then, the electric wire 23 in the strip state is subjected to a bending process.

FIG. 5 is a diagram showing an operation procedure for bending an electric wire using the bending tool section 10 of the electric wire bending tool 1 according to the present embodiment.
As shown in FIG. 5(A), an electric wire 23 is set between the center pin 13 and the support pin 14. At this time, about 5 mm from the base of the electric wire 23 from which the core wire coating (insulating coating) 24 has been stripped is positioned between the center pin 13 and the support pin 14.

Then, the bending tool section 10 is rotated clockwise by about 90 degrees as shown by the white arrow A1 so as to wind the electric wire 23 around the support pin 14.
Thereby, as shown in FIG. 5(B), the base of the electric wire 23 can be bent into an L-shape.

As shown in FIG. 5(C), the electric wire 23 is slid so that the tip of the electric wire 23 bent into an L shape is located between the center pin 13 and the support pin 14. Then, while imagining that the electric wire 23 is being wound around the center pin 13 from the tip side, the bending tool part 10 is rotated counterclockwise (counterclockwise) by about 270° to 300° as shown by the white arrow A2.

Thereby, as shown in FIG. 5(D), the tip of the electric wire 23 can be bent into a circular shape having a predetermined inner diameter.
FIG. 6 is a diagram showing an example of the electric wire 23 bent into a circle. The bent portion indicated by "26" in the figure is bent around the center pin 13, so its inner diameter is equal to the outer diameter of the center pin 13. The bent portion 26 is in the shape of a question mark or the shape of a "no" character.

FIG. 7 is a diagram illustrating how to correct the twist when the bent portion 26 of the electric wire 23 is twisted left and right with respect to the length direction of the electric wire 23.
As shown in FIG. 7, the bending part 26 is inserted into the slot 17 formed in the base 11 of the bending tool part 10, and the direction of the bending part 26 is corrected by rotating the bending tool part 10 in the direction of arrow A3. can.

FIG. 8 is a diagram showing, as an example, the positional relationship when the electric wire with the bent portion 26 is attached to an exposed outlet.
The outlet includes an outlet fitting 4 on a seat 3 made of an insulating material such as resin. The outlet fitting 4 has a connection terminal portion 41 for connecting an electric wire. An electric wire can be connected to the connection terminal portion 41 with a screw 5.

For example, the VVF cable 27 inserted from the bottom surface of the seat 3 has the sheath 25 removed, the wires 23 covered with the insulation coating 24, and the bent portions 26 formed at the tips of each wire 23. have. Then, the bent portion 26 is attached to the connection terminal portion 41 by passing the screw shaft of the screw 5 through the bent portion 26 and pressing the bent portion 26 with the screw head of the screw 5.

During installation, it is necessary to match the tightening rotational direction of the screw 5 and the bending direction of the bent portion 26. In particular, the second class electrician skill test requires that the electric wire (single wire conductor) 23 be provided with a bent portion 26 of an appropriate shape, and that the bending direction of the bent portion 26 be aligned with the direction of tightening and rotation of the screw 5. It will be done. The electric wire bending tool 1 according to the present embodiment is a useful tool for people taking the second class electrician skill test and electrician technicians.

FIG. 9 is a diagram showing an example of how to attach the bent portion 26 of the electric wire 23 to the connection terminal portion 41 of the outlet fitting 4 with the screw 5.
As shown in FIG. 9, when the operator sets the screw 5 on the tip of the driver shaft 32 while placing his finger on the screw 5, he can start tightening the screw 5 without dropping it. In the electric wire bending tool 1 according to the present embodiment, the driver shaft of the driver portion 30 is short, so that the user can place his/her finger on the screw 5 while gripping the handle 31. Therefore, there is an advantage that the screw 5 can be easily set at the tip of the driver shaft 32.

FIG. 10 is a perspective view showing a wire bending tool 50 according to another embodiment of the present invention. The electric wire bending tool 50 according to the present embodiment includes a base 11 and a center pin 13 and a support pin 14 protruding from the top surface 12 of one end of the base 11.

The base 11 is, for example, a hexagonal columnar body. The shape of the base 11 is not limited to a hexagonal columnar body, but may be a polygonal columnar body or a cylindrical body. A center pin 13 and a support pin 14 protruding from the top surface 12 of the base 11 each protrude perpendicularly from the top surface 12 and extend in parallel. The distance S between the center pin 13 and the support pin 14 is set to a distance that allows insertion of an electric wire to be bent (bare electric wire, preferably a single wire conductor).

Although it is desirable that the center pin 13 protrudes from the center of the top surface 12, the center of the top surface 12 may be located between the center pin 13 and the support pin 14.
The diameter φ ₁ of the center pin 13 is set to a size that allows a round bent portion with a desired inner diameter to be formed in the electric wire to be processed when the electric wire to be processed is bent along the center pin.

The diameter φ ₂ of the support pin 14 is preferably smaller than the diameter φ ₁ of the center pin 13, but φ ₂ =φ ₁ may also be satisfied. With such a configuration, even if the support pin 14 is used, a bent portion with a desired round inner diameter can be formed in the electric wire to be processed.

For example, the base 11 may be formed with a bent portion correction slot 17 extending in the axial direction (lengthwise direction). The bent portion correction slot 17 may be formed on one surface of the hexagonal columnar base 11, or may be formed on each of a plurality of arbitrary surfaces.
Further, the bent portion correction slot 17 may be formed to extend in the circumferential direction of the columnar body.

For example, all the constituent parts of the electric wire bending tool 50 may be formed of metal. Alternatively, it may have a hybrid structure of metal, resin, etc. to ensure the necessary strength. Alternatively, it may be constructed of ceramics or the like, or constructed using a 3D printer.

The electric wire bending tool according to the present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.

1, 50 Bending tool for electric wire 10 Bending tool part 11 Base 12 Top surface 13 Center pin 14 Support pin 15 Hole 16 Circumferential surface 17 Slot 18 End surface 19 Connection shaft 23 Conductor (wire)
26 Bending part 30 Driver part 31 Handle 32 Driver shaft

Claims (3)

a base including a peripheral surface and a top surface provided on one end side of the peripheral surface and extending in a direction perpendicular to the peripheral surface;
a center pin that protrudes from the center of the top surface and has a predetermined diameter and a predetermined height; and a center pin that protrudes from the top surface and is provided parallel to the center pin at a predetermined distance from the center pin. Equipped with a support pin,
The predetermined interval between the center pin and the support pin is set to an interval that allows insertion of a wire to be processed to be bent,
The predetermined diameter of the center pin is set to a diameter that allows the wire to be processed to be bent into a circle with a desired internal diameter when the wire to be processed is bent around the center pin. bending tools. A correction slot is provided on the circumferential surface of the base, and is a slot extending in the circumferential direction, into which a bent portion of a roundly bent electric wire to be processed is inserted to correct the orientation of the bent portion. The electric wire bending tool according to claim 1. 3. The electric wire bending tool is integrated with the short shaft driver by connecting a side of the base opposite to the top surface to an end surface of the handle of the short shaft driver opposite to the driver shaft. A bending tool for electric wires as described in .

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