JP2748850B2 - Coaxial receptacle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial receptacle used for a small high-frequency device or the like, and more particularly to a coaxial receptacle which can surely prevent a connection portion from being loosened with a simple structure.

[0002]

2. Description of the Related Art Conventionally, a coaxial receptacle used for a high-frequency device or the like is connected and fixed to a device housing as follows. That is, a method of forming a flange provided with a plurality of screw holes for mounting screws on the outer periphery of the housing of the coaxial receptacle, and after connecting, fixing the flange to the device housing with a mounting screw, or fixing the device housing. In this method, a male screw for screwing and fixing to the body is formed on the outer periphery of the coaxial receptacle, and this is screwed into a female screw provided in the device housing to be connected and fixed.

[0003]

However, in the case of the former coaxial receptacle, in which the flange is provided and fixed to the device housing, a fixed area is always required for the mounting portion of the device housing. There has been a problem that the size of the housing becomes large, which hinders the demand for miniaturization and weight reduction of high-frequency devices and the like. Also, in the case of the latter screw-type coaxial receptacle, there is a problem that the threaded portion of the screw becomes wider and the fixing becomes loose as the fitting and detachment with the device housing are repeated. In this case, a method of appropriately reinforcing and increasing the fixing force by using an adhesive in the threaded portion has conventionally been adopted.
The use of adhesive makes it difficult to attach and remove the coaxial receptacle, and the adhesive deteriorates due to changes in environmental temperature, etc.
Since problems such as a decrease in fixing force occur, they have not been effective solutions.

Incidentally, JP-A-63-72074, JP-A-63-224167, JP-A-1-134374, JP-A-3-116583 or JP-A-4-34879.
In each of the publications, techniques for preventing loosening of the connection part of the coaxial receptacle are proposed, but all of these techniques provide a separate loosening prevention structure or the like inside or outside the receptacle. As a result, the high-frequency device itself becomes complicated and large-sized, and the above-mentioned problems of the prior art cannot be solved.

The present invention has been proposed in order to solve the problems of the prior art, and requires only a simple, compact and lightweight structure without separately providing a fixing means having a complicated structure. An object of the present invention is to provide a coaxial receptacle for easily and surely preventing loosening occurring at a connection portion.

[0006]

In order to achieve the above object, a coaxial receptacle according to the present invention is a coaxial receptacle in which a male screw for fitting is formed on the outer periphery of a housing, and the outer peripheral diameter of the male screw at another end is changed to another. A portion slightly larger in diameter than the portion, a slit is formed in at least one location in the longitudinal direction of the large diameter portion, and a portion of the slit that comes into contact with the female screw inner wall when the male screw is screwed into the female screw inner wall. It is configured so as not to be inserted into the female screw, and the portion that comes into contact with the female screw inner wall when the male screw is removed is configured to be inserted into the female screw inner wall, and preferably, of the slit, of the female screw when the male screw is screwed. The side in contact with the inner wall is inclined in the direction opposite to the direction of rotation of the screw. Further, if necessary, the side of the slit, which is in contact with the inner wall of the female screw when the male screw is screwed in, is inclined in a direction opposite to the rotation direction of the screw, and the other side is formed in a wedge shape with the other side vertical. Or of the slit,
A portion that comes into contact with the inner wall of the female screw when the male screw is screwed in is formed in a round shape, or a corner of the slit that comes into contact with the inner wall of the female screw when the male screw is screwed in is cut.

[0007]

According to the coaxial receptacle of the present invention having the above structure, when the coaxial receptacle is screwed into the housing of the high-frequency device, the large diameter portion at the outer peripheral end of the coaxial receptacle bends toward the center inside because the slit is provided. Also, since the portion of the slit that comes into contact with the inner wall of the female screw does not enter, the screw can be easily screwed. Further, after the screwing is completed, the outer peripheral wall of the coaxial receptacle is pressed against the inner peripheral wall of the device housing by the resilient force, and the portion of the slit corresponding to the inner wall of the internal thread of the device housing is cut off, so that there is no loosening.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the coaxial receptacle of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of the coaxial receptacle of the present invention, and FIG.
(A) is a front view which shows one Example of the coaxial receptacle of this invention, (b) is a center longitudinal cross-sectional view. FIG. 3 is a side sectional view of a main part showing a mounted state of one embodiment of the coaxial receptacle of the present invention. In these figures, reference numeral 1 denotes a housing of a coaxial receptacle, on which a central conductor 2 is disposed on a central axis. An insulator 3 for electrically insulating the housing 1 and the center conductor 2 is provided between the housing 1 and the center conductor 2.
The insulator 3 is made of highly insulating rubber or resin, and has a certain elasticity.

On the outer periphery of the housing 1, there is formed a male screw 4 to be screwed into the female screw 8 of the housing 7 of the high-frequency device. The outer diameter of the male screw 4 is slightly larger than the inner diameter of the other male screw 4 and the inner diameter of the female screw 8 of the device housing 7 at the end on the side to be screwed with the device housing 7. A large diameter portion 5 is formed. Further, slits 6 (6a, 6b) are provided in at least one location (two opposed locations in this embodiment) in the axial direction of the large diameter portion 5.

In the present embodiment, the slit 6 is formed as shown in FIG.
As shown in the figure, the case 1 is formed in a wedge shape that is wide in the outer direction and narrows in the center direction. In addition, the wedge shape of the slit 6 indicates the direction of rotation of the screw when the male screw is screwed, that is, as shown in FIG.
When the male screw is screwed in the direction, the side that contacts the inner wall of the female screw 8 is inclined. Thus, when screwed the male screw in the direction of arrow A, the angle of the portion S ₁ hitting the inner wall of the internal thread 8 is an obtuse angle, whereas, when the try to remove the external thread in the direction of arrow B, hits the inner wall of the female thread 8 the angle of the portion S ₂ has become a right angle. In this embodiment, the male screw 4 is a right-hand screw (screw in the direction A in FIG. 2A).

According to the coaxial receptacle of the present embodiment having such a configuration, first, when connecting to the device housing 7, the slit 6 is formed. The large-diameter portion 5 is bent inward at the center, and the portion S _{1 of the} male screw 7 that contacts the female screw 8 is obtuse, so that the inner wall of the female screw 8 does not get into the inner wall, so the female screw 8 of the device housing 7 and the male screw of the housing 1 4 is screwed smoothly. When the screwing is completed, the elastic force of the housing 1 and the insulator 3 acts, and the large diameter portion 5 is pressed against the inner wall of the female screw 8 of the device housing 7. At the same time, when the male screw 4 tries to rotate in the direction in which the male screw 4 is disengaged from the female screw 8, ie, in the direction of arrow B in FIG.
The portion S ₂ impinging the internal thread 8 an inner wall of the slit 6 is not at right angles bites into the internal thread 8 an inner wall of the device housing 7 housing 1 does not return to FIG. 2 (a) B direction. That is, by this, the coaxial receptacle housing 1 and the high-frequency device housing 7
Connection does not loosen.

The coaxial receptacle of the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist, and includes, for example, the following modified examples. In the above-described embodiment, the slit is formed in an asymmetric wedge shape.
(B), the portion S ₁ hitting the inner wall of the internal thread 8 rounded, or may be formed in a shape cut when screwed the male screw 4. In this case, there is also an effect that the screwing of the female screw and the male screw becomes smoother. Further, as shown in FIG. 4C, the entire slit may be formed to be inclined in the B direction. In this manner, when the male thread is about to rotate in the B direction, the portion S ₂ the inner wall of the internal thread and abuts becomes an acute angle, the effect of preventing looseness more bite becomes strong increases. The large diameter portion provided at the end of the male screw may be provided not at the end but at the intermediate portion.

[0013]

As described above, according to the coaxial receptacle of the present invention, a complicated structure is not separately provided.
With only a simple, small, and lightweight structure, loosening that occurs at the connection can be easily and reliably prevented.
The size and weight of the entire device can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a coaxial receptacle of the present invention.

FIG. 2A is a front view showing an embodiment of the coaxial receptacle of the present invention, and FIG. 2B is a longitudinal sectional view at the center.

FIG. 3 is a side sectional view of a main part showing an attached state of one embodiment of the coaxial receptacle of the present invention.

FIG. 4 is a front view showing another embodiment of the coaxial receptacle of the present invention.

[Explanation of symbols]

1 coaxial receptacle housing 2 center conductor 3 insulation 4 male thread 5 thick portion 6 (6a, 6b) portions S ₂ male screw striking the slit 7 RF device housing 8 inner wall of the female thread of the slit when screwed a female screw S ₁ external thread The part that comes into contact with the inner wall of the internal thread of the slit when removing

Claims (5)

(57) [Claims] 1. A coaxial receptacle having an external thread for fitting formed on an outer periphery of a housing, wherein an outer peripheral diameter of an end portion of the external thread is formed to be slightly larger than another portion, and a longitudinal direction of the large-diameter portion is provided. A slit is formed in at least one place of the female screw, and a portion of the slit that comes into contact with the female screw inner wall when the male screw is screwed is configured so as not to be inserted into the female screw inner wall, and the female screw is formed when the male screw is removed. A coaxial receptacle characterized in that a portion that abuts on the inner wall is configured to fit into the inner wall of the female screw. 2. The coaxial receptacle according to claim 1, wherein a side of the slit that comes into contact with an inner wall of the female screw when the male screw is screwed is inclined in a direction opposite to a rotation direction of the screw. 3. A wedge shape in which the side of the slit that comes into contact with the inner wall of the female screw when the male screw is screwed in is inclined in the direction opposite to the direction of rotation of the screw, and the other side is vertical. Item 3. The coaxial receptacle according to item 1 or 2. 4. The coaxial receptacle according to claim 1, wherein a portion of the slit that comes into contact with an inner wall of the female screw when the male screw is screwed is formed in a round shape. 5. The coaxial receptacle according to claim 1, wherein a corner of a portion of the slit that comes into contact with an inner wall of the female screw when the male screw is screwed is cut.