JPH0492182A - Hollow member - Google Patents

Abstract

PURPOSE:To miniaturize and lighten the hollow member which consist of coil springs, in which wedge type ring elements of coil spacer are interposed between ring elements thereof, and oil spacers locked together, performing plastic working to the extensive wire material having round cross section to form coil spacers. CONSTITUTION:A hollow member consists of an adhesive coil spring 2 and a coil spacer 3 locked together. The coil spacer 3 is made of the extensive material, for example, a copper wire and has round cross section. This wire material is processed plastically into wedge-form, and the coil spring 2 is extended to form clearance between each ring element 2a, and the processed wire material is wound between these clearances to form a hollow member. As a result, a coil spacer having a small diameter can be used to make the outer diameter of the hollow member as small as a desired diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bendable hollow member, and particularly to a hollow member whose self-restoring property due to elasticity is suppressed.

[Prior Art] A metal hollow member that is flexible and can be maintained in a bent state is often used as a support member for a lighting lamp in a lighting stand or a microphone support member in a headphone equipped with a microphone.

A conventional hollow member will be explained with reference to FIGS. 1 and 2.

The hollow member 1 has a close coil spring 2 and the spring 2
The wire rod of the coil spacer 3 has a wedge shape that becomes thinner toward the center.

The close coil spring 2 is stretched, and the coil spring 2 and the coil spacer 3 are intertwined with each other, with the ring element 3a of the coil spacer 3 inserted between each ring element 2a of the spring 2.

In the state where the coil spring 2 and the coil spacer 3 are entangled, the ring element 2a is clamping the ring element 3a of the coil spacer 3 due to the restoring force of the coil spring 2. Therefore, ring element 2a and ring element 3
When the hollow member 1 is bent due to the frictional force between it and a, the restoring force is offset and the bent state is maintained.
Also, since the ring element 2a is in contact with the slope of the cross-sectional shape of the ring element 3a, an alignment action occurs between the ring element 2a and the ring element 3a, causing the coil spring 2 and the coil spacer 3 to come apart. is prevented.

[Problems to be Solved by the Invention] The coil spring and coil spacer used in the hollow member described above are both made of steel such as stainless steel, and the coil spacer is manufactured in accordance with standards, and has a cross-sectional shape. Both the shape and the coil diameter are relatively large (for example, the outer diameter of the coil is 71 mm), so there is a limit to the minimum diameter of a hollow member manufactured using such a coil spacer.

However, in recent years, various devices have been trending towards becoming lighter and more compact, and electronic devices using hollow members, such as headphone-equipped headphones that are worn on the head, are no exception.

For such wireless microphones, there are demands for a simple support structure for the microphone, and for the position of the microphone to be easily adjusted to suit individual differences.As a support member for the microphone, which also serves as protection for the microphone lead wire, The hollow member is used.

Microphones in recent years have become much smaller, and the conventional hollow member described above is too large in diameter and too heavy to be used as a support member for these smaller microphones.

Furthermore, when the microphone user is a woman, child, etc., there is a further demand for smaller size and lighter weight, and there is a problem in that conventional microphones cannot satisfy this demand.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a hollow member that can satisfy the recent demands for smaller size and lighter weight.

[Means for Solving the Problems] The present invention provides a hollow member constructed by intertwining a coil spring and a coil spacer such that a coil spacer ring element having a wedge-shaped wire cross section is interposed between the coil spring ring elements. In the present invention, the coil spacer is plastically worked from a wire with a circular cross section made of a ductile material, and the coil spacer is injection molded from a resin material.

[Function] Since it is composed of a coil spring and a coil spacer, it can be bent freely, and the bent state is maintained by the frictional force between the coil spool and the coil spacer. Furthermore, the coil spacer is made by plastic processing from a wire rod with a circular cross section.
Furthermore, since the coil spacer is made of injection molded resin, the coil spacer can be made as small in diameter as desired, and a hollow member with a desired small diameter can be manufactured.

[Implementation example] An embodiment of the present invention will be described below with reference to the drawings.

The structure of the hollow member according to the present invention in which the close coil spring 2 and the coil spacer 3 are intertwined is the same as that of the prior art described above, and therefore will be explained with reference to FIG. 1 described above.

The coil spacer 3 is made of a highly ductile material, such as a copper wire, and the wire has a circular cross-sectional shape.

This wire is plastically worked into a wedge shape, the coil spring 2 is stretched, a gap is created between each ring element 2a, and the processed wire is wound around this gap to form an intermediate member.

In this way, the close coil spring itself can be easily manufactured according to the required specifications, and the wire rod used as the material for the coil spacer can have a cross section or a circular shape, so it can be freely selected up to an extremely fine wire diameter. . Therefore, there is no restriction on reducing the diameter in manufacturing the hollow member, and it is possible to manufacture the intermediate member with a desired diameter that meets the requirements.

The material of the wire material of the coil spacer may be flexible soft stainless steel, and the intermediate member may or may not be covered with a synthetic resin tube. If a gold wire is used for the wire or if the wire is plated with gold in advance, a modification effect will be produced.

Furthermore, if synthetic resin or hard rubber is used as the material for the coil spacer, such materials can be easily injection molded into any cross-sectional shape, so it is possible to manufacture a hollow member with a desired diameter as described above. can.

Furthermore, although the above embodiment shows the case where the hollow member is used as a support member for a microphone, it can also be used as a support member for various sensors or as a sound conduit.

[Effect of the invention 1] As described above, according to the present invention, since a coil spacer with a wire diameter or a small diameter can be used, the outer diameter of the hollow member can be reduced to a desired diameter, and the requirement for lightweight and small size is met. can be satisfied.

[Brief explanation of the drawing]

FIG. 1 is an external view of the hollow member, and FIG. 2 is a front sectional view thereof. 1 is a hollow member, 2 is a coil spring, 3 is a coil spacer, and 2a and 3a are ring elements.

Claims (1)

[Scope of Claims] 1) In a hollow member constructed by intertwining a coil spring and a coil spacer such that a ring element of a coil spacer having a wedge-shaped wire cross section is interposed between the ring element of the coil spring, the above-mentioned A hollow member characterized in that a coil spacer is plastically worked from a wire rod with a circular cross section made of a ductile material. 2) In a hollow member constructed by intertwining a coil spring and a coil spacer such that a coil spacer ring element having a wedge-shaped wire cross section is interposed between the coil spring ring element, the coil spacer is made of a resin material. A hollow member characterized by injection molding.