JP3820366B2 - Microphone support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a microphone support device, and more particularly to a microphone support device having a telescopic pipe nested in a part of a component.
[0002]
[Prior art]
In particular, gooseneck type microphones are preferably used in conference halls, and an example thereof is shown in FIG.
[0003]
In this example, the microphone support device is composed of a cylindrical member in which flexible pipes 21 and 22 are connected to both ends of a telescopic telescopic pipe 10. The microphone unit M is supported by the upper flexible pipe 21, and the lower flexible pipe 22 side is It is fixed to the stand base B. Although not shown, the wiring cord of the microphone unit M is drawn out to the stand base B side through each pipe.
[0004]
Since gooseneck type microphones are required to have a slender and good-looking appearance, in many cases, a fitting structure is adopted for the connection of each member, and the connection part is bonded by an adhesive such as an epoxy resin. In terms of appearance, not much fixing screws are used.
[0005]
In this way, it is as thin and as good as possible. However, the inner diameter is originally small, and on the inner surface, there are a large number of irregularities due to the stepped portion of the end surface of the small-diameter pipe that expands and contracts and the protruding adhesive.
[0006]
The wiring cord is inserted into the pipe with a length at least when the telescopic pipe 10 is extended to the maximum. Therefore, when the telescopic pipe 10 is contracted, the flexible pipe 10 is bent, but the bent portion may be entangled with a stepped portion or an uneven portion on the inner surface of the pipe.
[0007]
This entanglement phenomenon is called a kink, and once a kink occurs, it is difficult to unravel and the kink location is fixed. Therefore, bending stress repeatedly concentrates at the kink portion every time the expansion and contraction pipe 10 is expanded and contracted, and eventually breakage may occur due to bending fatigue. In addition, since it is difficult to specify where the kink occurs, the operation force during expansion / contraction varies for each microphone.
[0008]
In addition, in order to absorb the bending of the wiring cord accompanying the expansion and contraction of the expansion and contraction pipe 10, a curl cord is actually used as the wiring cord. However, if the curl cord is used, a pipe having a large diameter must be used. Therefore, it is not preferable in appearance. Not only that, but if kinks occur in the curled cord, repair is difficult.
[0009]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to prevent kinks from occurring in the internal wiring cord while maintaining the appearance that is thin and attractive.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention consists of a cylindrical member as a whole, and includes a telescopic pipe in a part thereof, supports the microphone unit on one end side, and fixes the other end side to the stand base, In the microphone support device in which a bendable wiring cord connected to the microphone unit is inserted, a part of the wiring cord includes a large-diameter pipe and other members of the expansion pipe when the expansion pipe is fully extended. The surface smoothing layer is provided over a range that is not less than the length from the connecting joint to the inner surface step portion of the small-diameter pipe and not more than the maximum extension length of the stretchable pipe.
[0011]
According to this configuration, even if the pipe inner surface has irregularities due to the expansion / contraction part or the protrusion of the adhesive, the wiring cord at that part is easily slipped, so that there is no possibility of occurrence of kinks. In addition, there is no variation in the operation force during expansion / contraction for each microphone.
[0012]
From the viewpoint of material availability and cost, it is preferable to use a heat-shrinkable tube as the surface smoothing layer. However, an uncrosslinked specific resin is applied to a predetermined portion of the wiring cord and crosslinked by electron beam irradiation. The surface smoothing layer may be used.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS. The microphone support device according to this embodiment also has a configuration in which flexible pipes 21 and 22 are connected to both ends of a telescopic telescopic pipe 10 as in the conventional example of FIG. 5 described above.
[0014]
The telescopic pipe 10 and the flexible pipes 21 and 22 may be the same as those in the above-described conventional example. However, in order to understand the present invention, first, these configurations (particularly, the configuration of the connecting portion) will be described in more detail.
[0015]
1 is a cross-sectional view of a state in which the expansion pipe (slide pipe) 10 is contracted, FIG. 2 is a cross-sectional view of the state in which the expansion pipe 10 is extended, and FIG. 3 is a connection joint between the expansion pipe 10 and the flexible pipe 22 on the lower side. It is an expanded sectional view of a part. Although not shown in FIG. 5, the wiring code of the microphone unit M is indicated by reference numeral 40 in FIG. 4, and the single wiring code 40 is shown in FIG.
[0016]
The expandable pipe 10 is a two-stage nested type of a large-diameter pipe 11 and a small-diameter pipe 12, and the large-diameter pipe 11 is connected to a flexible pipe 22 via a connection sleeve 30. The telescopic pipe 10 may be, for example, a three-stage nested type. Further, an upper flexible pipe 21 is connected to the small diameter pipe 12 (see FIG. 5). Although not shown, a retaining means is provided between the large diameter pipe 11 and the small diameter pipe 12.
[0017]
The large-diameter pipe 11 and the flexible pipe 22 have substantially the same outer diameter in appearance, and are fitted into the connection sleeve 30 coaxially. The fixing means is not a screw (screw) fixing but an adhesive for improving the appearance. When an adhesive is used, for example, the large diameter pipe 11 and the flexible pipe 22 are fitted after being applied to the inner surface of the connection sleeve 30.
[0018]
At that time, in order to ensure adhesion and fixation, the amount of adhesive applied is often slightly increased, so that as shown in FIG. Sphere) 31. This causes the kinking (entanglement) of the wiring cord 40. Separately from this, the telescopic pipe 10 is provided with a stepped portion 12a by an end portion of the small-diameter pipe 12 on its inner surface. This step portion 12a also causes kinking of the wiring cord 40.
[0019]
Also in the present invention, a two-core shielded cable that is easily bent as usual is used for the wiring cord 40, but the kink of the wiring cord 40 is eliminated by making the surface smooth and slippery. Therefore, in the present invention, a surface smoothing layer 41 is formed on a part of the wiring cord 40 as shown in FIG.
[0020]
The surface smoothing layer 41 has a length L1 or more extending from the connecting joint portion of the large diameter pipe 11 and the connection sleeve 30 to the inner surface step portion 12a of the small diameter pipe 12 when the expansion pipe 10 of FIG. The extension pipe is formed over a range not exceeding the maximum extension length L2.
[0021]
The surface smoothing layer 41 is formed by cutting the heat-shrinkable tube into the above length and inserting it into the wiring cord 40, followed by heating. Thereby, a part of the wiring cord 40 becomes hard and slippery, and the other part remains flexible and easily bent and deformed. The surface smoothing layer 41 can be similarly formed by applying a specific resin to the wiring cord 40 and curing the resin by electron beam irradiation.
[0022]
According to this configuration, since the surface smoothing layer 41 is easily slipped when the elastic pipe 10 is extended and contracted, the wiring cord 40 is caught or entangled with the convex portion 31 of the adhesive, the stepped portion 12a of the small diameter pipe 12, or the like. There is no longer to do. Moreover, as shown in FIG. 1, when the part other than the surface smoothing layer 41 of the wiring cord 40 bends in the flexible pipe 22, for example, the difference in length due to expansion and contraction is absorbed.
[0023]
In addition, when there is an inner surface convex portion that causes kinking at a location other than the stretchable pipe 10, a surface smoothing layer may be provided at a location corresponding to the inner surface convex portion of the wiring cord 40. .
[0024]
In the above embodiment, the flexible pipe is connected to both ends of the elastic pipe. However, in the present invention, the flexible pipe is an arbitrary structure, and for example, the flexible pipe is connected only to one side of the elastic pipe. Alternatively, other pipe materials may be used instead of the flexible pipe. The present invention is not limited to the gooseneck type microphone.
[0025]
【The invention's effect】
As described above, according to the present invention, it is possible to reliably prevent the kinking of the wiring cord inserted into the pipe. In addition, the expansion / contraction operation force of each microphone can be stabilized. Since it is not necessary to use a curl cord, the appearance can be made thin and good-looking. Since there is no need to use a special material, the effect that it can be produced at low cost is exhibited.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a state in which a telescopic pipe is contracted in an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state in which an expansion pipe is extended in an embodiment of the present invention.
FIG. 3 is an enlarged sectional view of a main part of the embodiment of the present invention.
FIG. 4 is a plan view showing a main part of a wiring cord used in an embodiment of the present invention.
FIG. 5 is an external view of a gooseneck type microphone.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Telescopic pipe 11 Large diameter pipe 12 Small diameter pipe 12a Step part 21,22 Flexible pipe 30 Connection sleeve 31 Convex part 40 by leaking adhesives Wiring cord 41 Surface smoothing layer

Claims (3)

The whole is made of a cylindrical member, part of which includes a telescopic telescopic pipe, supports the microphone unit at one end, is fixed to the stand base at the other end, and is bendable connected to the microphone unit inside In a microphone support device through which a simple wiring cord is inserted,
A part of the wiring cord has a length that is longer than the length from the connecting joint between the large-diameter pipe of the telescopic pipe and another member to the inner surface step portion of the small-diameter pipe when the telescopic pipe is fully extended, and the telescopic pipe A microphone-supporting device, wherein a surface smoothing layer is provided over a range equal to or less than the maximum extension length. The microphone support device according to claim 1, wherein the surface smoothing layer is made of a heat shrinkable tube. The microphone support device according to claim 1, wherein the surface smoothing layer is made of an electron beam cross-linked resin coating.

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