JPH069380Y2 - Telescopic wire - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a telescopic electric wire required for wiring in mechatronics devices such as joint robots, mobile machines, electronic devices and the like.

[Problems to be solved by conventional techniques and devices]

With the recent development of the mechatronics industry such as robots, multi-joint arm devices, linear reciprocating motion devices, rotating devices, twisting devices, lifting devices, vibration devices and other mobile machine leads, or transmission between computers and other electronic devices. Expandable electric wires have come to be used as (interface) cables.

Thus, conventional expandable electric wires are known such as those described in Japanese Utility Model Publication No. 57-154019, Japanese Patent Publication No. 59-158020, and Japanese Utility Model Publication No. 36-7249. However, the above-mentioned electric wire is formed by spirally winding a long metal body on a stretchable core made of vulcanized rubber, which does not have a large elongation rate and is stretched in the longitudinal direction. At that time, the elastic core might exceed the elastic limit. In addition, the above-mentioned electric wire has a single curl having a double curl, the cord itself does not expand and contract, and the elongation rate is not so large. Furthermore, the above-mentioned electric wire is formed by spirally winding a conductor core wire that does not expand or contract itself, coating the outside with a protective coating layer and a surface layer, and further spirally winding the whole. Therefore, since the conductor core wire is wound in a spiral shape even if the conductor core wire is helically wound even if the conductor core wire is pulled straight in the longitudinal direction and then pulled in the longitudinal direction, the conductor core wire can be extended until it becomes linear. In this case, a tensile force may act on the conductor core wire and damage the core wire.

Therefore, an object of the present invention is to provide an expandable electric wire which has an extremely high elongation rate and which does not damage the inner conductive wire.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, an expandable electric wire according to the present invention includes a wire-shaped core member made of an elastic material capable of expanding and contracting, a conductor wire wound around the core member in a coil shape, and covering the conductor wire. The core member, the conductor, and the insulator form a core that integrally expands and contracts with an insulator made of a stretchable and deformable elastic material,
A plurality of stretchable wire cores are wound in a horizontal winding to form a stretchable electric wire body, and the stretchable electric wire body is covered with an exterior made of a stretchable and deformable elastic material.
The whole is wound in a tightly wound manner in the form of a coil spring so that the length dimension in the fully extended state is 10 times or more the length dimension in the free state.

[Action]

This stretchable electric wire can be stretched until the entire spiral state becomes a substantially linear state, and then it is stretched until the electric wire main body becomes a substantially linear state, and even after that, it can be stretched in a straight state due to the elasticity of the core itself. .

Also, since the conductor wire is wound around the core member in a coil shape,
Even if the wire core itself extends in the longitudinal direction, the conductor wire extends in a coil spring shape according to the elongation, and no tensile force acts on the conductor wire itself.

Further, when the wire core is curved, a gap is formed on the outer peripheral side of the conductor wire in the arc portion formed by the curvature, and the bending can be accommodated.

Moreover, when the wire core is expanded and contracted, the core member, the conductive wire, and the insulator are expanded and contracted integrally, so that the conductive wire does not collapse.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an expandable electric wire according to the present invention, in which two expandable linear wire cores 1 shown in FIG. The outer casing 2 made of a flexible elastic material is formed by extrusion molding, and the whole is wound in close contact to form a coil spring.

As shown in FIG. 2, FIG. 4, and FIG. 5, the wire core 1 includes a wire-shaped core member 3 made of an elastic material that is expandable and contractible, and a conductor wire 4 wound around the core member 3 in a coil shape. Similarly to the core member 3, the core member 3 is made of an elastic material that can be expanded and contracted, and an insulator 5 that covers the outside of the wound conductive wire 4. The conductor 4 is formed by rolling a wire having a circular cross section into a thin strip (so-called strip foil) as shown in FIG.
It is wound around the core member 3 in a contracted state in the form of a close contact coil.
As the elastic material of the core member 3 and the insulator 5, there are various restorative polymers such as butyl rubber, neoprene rubber, styrene butadiene rubber, nitrile rubber, polyurethane rubber, and silicone rubber. Is preferable because the deterioration of elasticity is small. The conductor wire 4 can have a cross-sectional area or the number of strands which can be increased or decreased according to the required electric capacity, and may have a circular cross-section which is not rolled into a band shape. The insulator 5 is formed by extrusion molding.

Thus, in the wire core 1 thus formed, the core member 3, the conductor wire 4 and the insulator 5 constituting the conductor core 1 are uniformly expanded and contracted, and in the extended state, the conductor wire 4 has a large pitch.
The state is as shown in FIG.

That is, even in the stretched state, the tensile force does not act on the conductor wire 4, and the conductor wire 4 does not break.

Furthermore, when the wire core 1 is curved in an arc shape, a gap is formed on the outer peripheral side of the conductor wire in the arc portion formed by this curvature, and the curvature can be accommodated.

Therefore, even when the wire core 1 is expanded and contracted and bent, the conductor wire 4 does not cause winding deviation and does not break.

Next, as the elastic material used for the outer package 2, there are various above-mentioned restorative polymers similar to the core member 3 and the insulator 5 of the wire core 1, but especially the environment resistance (heat resistance, cold resistance, wear resistance). Properties, bending resistance, etc.) are required, and a material that meets the purpose is selected and used.

Needless to say, the number of wire cores 1 and 1 is not limited to two and may be three or more. Further, by making the plurality of wire cores 1 ... In a horizontal winding shape, there is an advantage that the elasticity is improved.

According to this invention, the expandable electric wire has a large outer diameter due to the coil shape, but since it has a structure that can be expanded and contracted in a linear shape in addition to the expansion and contraction due to the coil shape, it can be expanded even in a substantially linear shape. It can grow further and has a greater elongation. For example, in the case of a handset cord of a telephone, an experiment shows that the rate of increase is 10 times or more. On the other hand, the elongation rate of the conventional handset cord is about twice as described above, and the elongation rate is small. Therefore, the distance between the handset and the telephone body during a call is short, and the telephone body is pulled and moved. There were many things I did.

Moreover, if the cord is unreasonably stretched more than necessary, the cord will not return to its original close contact state and the internal conductor (copper wire)
However, when the expandable electric wire of the present invention is used, the above-mentioned drawbacks can be satisfactorily resolved. Further, the elongation amount can be made larger than that of the conventional handset cord, and the length in the free state (no load state) can be markedly shortened, so that the cord does not become an obstacle when not in use. That is, when the length dimension in the free state is set to about 10 cm (30 to 40 cm in the case of the conventional cord), the length dimension in the maximum extension state becomes 1 m or more (about 80 cm in the conventional cord).

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

If this stretchable wire is pulled in the longitudinal direction, the entire spiral state becomes a straight line state, and then the wire body 6 extends until it becomes a straight line state. Further, after that, the wire core 1 of the wire body 6 itself becomes a straight line state. The core 1 is stretched by the elasticity of the core 1. Therefore, even if the maximum extension state is the same length, the extension wire according to the present invention has a longer free state (no load) than the conventional extension wire even if the extension wire has an extremely high elongation rate. The size can be significantly reduced.

The length in the free state is greatly shortened, making it easy to handle and store and transport. Therefore, if it is used as a telephone receiver cord of a telephone, an extra cord is not exposed to the outside, and it does not interfere when the telephone is placed on a desk or the like for use.

Since the expansion ratio of the conventional expandable wire is not so large, a relatively long wire is required to manufacture a predetermined length, which is uneconomical in cost and heavy in weight. In this case, the electric wire was slackened by its own weight and was swayed around when the arm was rotated, which was dangerous, but with this telescopic electric wire, even when it was placed outside the arm of the robot while keeping the straight shape without slackening,
The movement of the arm can be dealt with, and the electric wire is not swung even when the arm rotates, which is extremely safe.

Since the conductive wire 4 is interposed between the core member 3 and the insulator 5, and the outside of the insulator 5 is covered with the exterior 2,
The conducting wire 4 is effectively protected and is not damaged by an external influence.

With the conductor 4 interposed between the core member 3 and the insulator 5, the conductor 4 and the core member 3 and the insulator 5 expand and contract integrally, so that the conductor 4 does not collapse. Moreover, even if the wire core 1 extends in the longitudinal direction, the conductor wire 4 extends in a coil spring shape in accordance with the elongation, and no tensile force acts on the conductor wire 4. Therefore, the conductor wire 4 is extremely unlikely to be broken, and the expandable electric wire as a whole has excellent durability.

Since this expandable electric wire is a multi-core electric wire having a plurality of wire cores 1 ..., It is possible to perform a plurality of wirings without being sublime.

[Brief description of drawings]

FIG. 1 is a perspective sectional view of an embodiment of the present invention, FIG. 2 is a perspective sectional view of a core, FIG. 3 is an enlarged vertical sectional view of a main part of the core, and FIG.
FIG. 5 is a horizontal cross-sectional view of the same, and FIG. 5 is an enlarged vertical cross-sectional view of an essential part showing a stretched state of the wire core. 1 ... Wire core, 2 ... Exterior, 3 ... Core member, 4 ... Conductive wire, 5 ... Insulator, 6 ... Electric wire main body.

Claims (1)

[Scope of utility model registration request] 1. A linear core member 3 made of an elastic material which is elastically deformable, and a conductive wire 4 wound around the core member 3 in a coil shape.
The core member 3, the conductor wire 4, and the insulator 5 integrally form a core 1 with the insulator 5 made of an elastic material that covers the conductor wire 4 and can expand and contract. Core 1
Are wound in a horizontal winding manner to form a retractable electric wire body 6, and the stretchable electric wire body 6 is covered with an exterior 2 made of an elastic material that is elastically deformable, and the whole is in a tight contact state. An extendable electric wire characterized in that the length dimension in the fully extended state is 10 times or more than the length dimension in the free state, in the form of a coil spring wound horizontally.