JPH1027647A - Connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connector, while adopting a contact structure capable of realizing stable contact resistance and low inserting force, which can prevent partial increase of electric resistance of a socket main unit, attain downsizing and lightening of weight, particularly forming in a small diameter, and facilitate mounting/demounting. SOLUTION: This connector has a plug main unit 12, socket main unit 13 and internal thread parts 22, 23 respectively screwed to external thread parts 17, 21 formed in these main units, and comprises a nut-shaped lock member 14 fixedly connecting the socket main unit 12 and a plug main unit 13 and an annular contact shoe 15 brought into elastic contact with an outer surface of a plug part 20b and an inner surface of a socket hole 16b, and, in a position of an internal surface of a socket hole 16 overlapped in a lengthwise direction with the external thread part 17 of the socket main unit 13, a peripheral grove 18 receiving the contact 15 is provided, and the lock member 14 is constituted by a conductive material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a connector,
The present invention relates to a connector which is provided with a plug and a socket which are respectively attached to ends of electric wires and are fitted to each other, and which are suitable for connection between electric wires used in various power equipment.

[0002]

2. Description of the Related Art A connector shown in Japanese Utility Model Publication No. 1-22302 has been proposed as a connector in which a plug and a socket are attached to an end of an electric wire. As shown in FIG. 5, the connector 1 has a cylindrical socket body 2 having a socket hole 2a formed at one end and an electric wire insertion hole 2b formed at the other end for compressing and fixing the electric wire 3, and at one end, A rod-shaped plug body 4 having a plug 4a inserted into the socket hole 2a and an electric wire insertion hole 4b formed at the other end;
In the circumferential groove 2c formed inside the socket hole 2a,
An annular contact 5 is provided for elastically contacting the bottom surface of the peripheral groove 2c and the outer surface of the plug 4a. A lock nut 6 screwed with a male screw 2d formed on the peripheral surface of the socket main body 2 is loosely fitted to the plug main body 4 in a state where movement in the longitudinal direction is restricted by a stopper spring 7.
By screwing the lock nut 6 into the male screw 2d and tightening, the insertion of the plug 4a into the socket hole 2a is advanced, and the socket body 2 and the plug body 4 are finally connected and fixed. It has become.

Here, the contact 5 is formed by forming a band plate having a constant width in an annular shape, and the both edges of a plurality of blades formed by bending at a constant interval in the circumferential direction are formed in the socket hole 2a. The elastic contact between the bottom of the peripheral groove 2c and the outer surface of the plug 4a reduces the contact resistance and the like. Further, the lock nut 6 is a ring-shaped member that is loosely fitted to the plug body 4 and is fastened only to the male screw 2d provided on the socket body 2; It only functions as

[0004]

However, in the connector 1 as described above, the contact resistance is reduced by the contact 5 and the insertion resistance when the plug 4a is inserted into the socket hole 2a is reduced. While
A circumferential groove 2c for accommodating the annular contact 5 must be formed in the socket hole 2a, and the wall thickness of the socket body 2 becomes the thinnest in the circumferential groove 2c, thereby increasing electrical resistance. There is. That is, while there is an advantage that the contact resistance can be reduced, there is a disadvantage that the electric resistance increases, and depending on the magnitude of the flowing current, there may be a disadvantage that heat is generated in the peripheral groove 2c.

In order to prevent such inconvenience, it is necessary to increase the thickness of the socket body 2 at the peripheral groove 2c. However, an increase in the thickness of the entire socket body 2 is not preferable because it leads to an increase in the weight and size of the connector 1. When securing the thickness of only the peripheral groove 2c, the socket body 2 has a complicated shape. As a result, there is a possibility that an increase in product cost accompanying an increase in the number of manufacturing steps may occur.

On the other hand, conventionally, this type of connector 1 has often been adopted in an installed electric wire capable of securing a sufficient wiring space, so that the reduction in size and weight has not been a serious problem. In recent years, there has been a growing demand for adoption of electric wires in a limited wiring space, such as wiring in a building, and with such demands, it has been strongly desired to reduce the size and weight, particularly, reduce the size in the radial direction. It has become.

In the connector 1, since the lock nut 6 loosely fitted to the plug 4a is fastened to the socket body 2, the structure around the lock nut 6, that is, the inner flange 6a of the lock nut 6, Stopper spring 7, groove 4c for mounting it, and plug 4
Since the structure including the flange portion 4e provided at a is complicated and the number of parts increases, there is a disadvantage that the product cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and employs a contact structure capable of realizing a stable contact resistance and a low insertion force while increasing a partial electric resistance of a socket body. It is an object of the present invention to provide a connector which can reduce the size and weight, particularly the diameter of the connector, and can be easily attached and detached.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plug body made of a conductive material which is attached to one end of an electric wire and has a rod-shaped plug portion at the end, and another electric wire. A socket body made of a conductive material having a socket hole in which the plug portion can be inserted at the end attached to the end of the plug body, and female screw portions screwed to male screw portions formed in the plug body and the socket body, respectively. Having a plug portion inserted in the socket hole, a nut-shaped locking member for connecting and fixing the plug body and the socket body, and disposed between the outer surface of the plug portion and the inner surface of the socket hole, An annular contact which is resiliently brought into contact with the outer surface of the plug portion and the inner surface of the socket hole, and a male screw portion formed on the socket body on the inner surface of the socket hole. At positions overlapping in a longitudinal direction, it said has circumferential grooves for accommodating the contacts are formed, the locking member is proposed a connector that is made of a conductive material.

Further, in the above connector, it is effective to make the thread winding directions of the male screw portion of the plug body and the male screw portion of the socket body different.

[0011] Further, between the two internal thread portions of the lock member screwed to the external thread portion of the plug main body and the external thread portion of the socket main body, an inner diameter dimension equal to or larger than the root diameter of these internal thread portions is provided. A recess having an outer diameter smaller than the inner diameter of the female thread of the lock member at either the distal end of the external thread of the plug body or the distal end of the external thread of the socket body, and the female thread of the lock member. An insertion portion having a longer length dimension is provided, and is provided at a tip of an insertion portion arranged in the relief portion when inserted into the lock member, and prevents the lock member from falling off from the insertion portion. Means may be provided. Furthermore, a through-hole may be provided at a position in the longitudinal direction of the lock member so as to penetrate the wall surface.

[0012]

According to the connector of the present invention, with the plug body attached to the end of one wire and the socket body attached to the end of the other wire, the plug portion of the plug body is connected to the socket hole of the socket body. The plug body and the socket body are connected and fixed by inserting the female screw part of the locking member into the male screw part provided on the plug body and the socket body and fastening the female member. A peripheral groove is formed on the inner surface of the socket hole of the plug body, and an annular contact is accommodated in the peripheral groove, so that the contact is resiliently formed on the outer surface of the plug portion and the inner surface of the socket hole. , Contact resistance is reduced, and stable electrical connection is implemented.

In this case, the thickness of the socket body is reduced in the peripheral groove portion for accommodating the contact, but the peripheral groove is formed at a position overlapping the male screw portion formed in the socket body in the longitudinal direction, and The lock member is made of a conductive material, and the lock member is fastened to both the socket body and the plug body with screws, so that a conductive path via the lock member is secured and the electric resistance increases. This can be prevented.

Further, with this configuration, the shape of the socket main body in the peripheral groove portion does not need to be different from the other portions, and a simple shape can be adopted, and the manufacturing process can be shortened.
It is possible to reduce product cost, product size and product weight, and the like. Further, since the lock member also has a function as a conductive member, all parts can be effectively used without waste, and as a result,
The diameter of the entire connector can be reduced.

In the above connector, if the thread direction of the external thread of the plug body and that of the external thread of the socket body are made different, the plug body and the socket body can be rotated only by rotating the locking member in one direction. The insertion of the plug portion into the socket hole can be advanced without rotating. Therefore, the operator can simultaneously perform the fastening of the lock member to the socket body and the fastening of the lock member to the plug body only by performing a simple operation of rotating the lock member in one direction. That is, since two screw fastening operations can be performed with the same number of man-hours as one screw fastening operation, the work can be extremely simplified and the number of man-hours can be reduced.

Further, the insertion portion provided at either the tip of the male screw portion of the plug body or the socket body is inserted into the female screw portion of the lock member, and falls into the tip of the insertion portion provided at the escape portion of the lock member. By providing the prevention means, the lock member is held in a state of being assembled to the plug body or the socket body. Therefore, the plug member or the socket body to which the lock member is integrally attached, and the socket body or the plug body to which the lock member is not attached can be handled as two parts, and the parts management can be simplified. is there.

Further, if a through-hole is formed through the wall surface at an intermediate position in the longitudinal direction of the lock member, the fastening state of the plug body and the socket body, which are screwed into the female screw portion of the lock member and fastened. Can be observed through the through hole. As a result, the fastening can be reliably performed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a connector according to the present invention will be described below with reference to FIGS.
The connector 10 according to the present embodiment, as shown in FIG.
A socket body 12 attached to an end of one of the pair of wires 11a and 11b to be connected.
And a plug body 13 attached to the end of the other electric wire 11b, and these socket body 12 and plug body 1
3 and a lock member 14 for connecting and fixing
And a contact 15 incorporated therein.

The socket body 12 is a cylindrical member having a through hole 16 in the center along the longitudinal direction, and has a substantially flat outer surface in the longitudinal direction. As the socket body 12, it is preferable to use a pipe material,
It may be formed by shaving from a round bar. In the socket body 12, one end in the longitudinal direction is a compression section 12a to which the electric wire 11a is attached, and the other end is the plug body 1
3 is a socket portion 12b for connection to the socket 3. The through hole 16 on the side of the compression part 12a is connected to the electric wire 11a.
Hole 16a into which the tip of the socket 12 is inserted.
The through hole 16 on the b side is a socket hole 16b for inserting a plug portion of the plug body 13 described later.

A male screw 17 is formed on the outer surface of the socket 12b. The male screw portion 17 is formed, for example, in a clockwise direction of a screw thread, that is, a right-hand thread. Further, a peripheral groove 18 that can accommodate the contact 15 is formed on the inner surface of the socket hole 16b.
This peripheral groove has a width dimension not more than the length of the male screw portion 17 and is preferably formed at a position that completely overlaps with the male screw portion 17 in the longitudinal direction of the socket hole 16b. .

The compression portion 12a is radially compressed from the outside by a compression tool (not shown) with the conductor of the electric wire 11a inserted into the insertion hole 16a, thereby being pressed against the conductor of the electric wire 11a. The socket body 12 can be attached to the end of the electric wire 11a.

The plug body 13 is a rod-shaped member having a compression portion 13a having an insertion hole 19 similar to the socket body 12 at one end, and a plug portion 20 for connecting to the socket body 12 at the other end. is there. The plug section 20
Is a large-diameter portion 2 equivalent to the outer diameter of the socket body 12.
0a and a small diameter portion 20b having an outer diameter slightly smaller than the inner diameter of the socket hole 16b.

On the outer surface of the large diameter portion 20a of the plug portion 20, a male screw portion 21 is formed over a range of a predetermined length from the boundary with the small diameter portion 20b. This male screw part 21
Is a counterclockwise, that is, a left-hand thread in which the thread winding direction is in a reverse thread relationship with the external thread portion 17 on the outer surface of the socket portion 12b.

The lock member 14 is a thin-walled cylindrical member having an outer diameter larger than that of the socket body 12 and the plug 13 and has an inner surface formed with the socket portion 12b.
Female screw part 22 of the right screw screwed into the male screw part 17
And a female screw portion 23 of a left-hand thread that is screwed to the male screw portion 21 of the plug portion 20. The lock member 14 is made of, for example, a conductive material such as copper or a copper alloy. In order to improve operability, knurls, parallel surfaces, and the like are formed on the outer surface of the lock member 14.

The contacts 15 are formed, for example, on a thin metal strip having a width slightly smaller than that of the peripheral groove 18 in the same manner as in the prior art by a plurality of strips extending in the width direction at equal intervals in the length direction. And a portion between the cuts is bent around an axis in the width direction to project up and down on the band plate to form an annular shape having a diameter slightly larger than the groove bottom diameter of the circumferential groove 18. . The contact 15 is inserted into the circumferential groove 18 with a slightly reduced diameter, so that the contact 15 is housed in the circumferential groove 18 by the elastic restoring force of the contact 15 itself. I have. The radially inwardly protruding portion of the contact 15 accommodated in the circumferential groove 18 is located at a radial position slightly smaller than the outer diameter of the small diameter portion 20b of the plug portion 20. ,
When the small diameter portion 20b is inserted, the outer surface of the small diameter portion 20b and the groove bottom of the circumferential groove 18 are brought into close contact with each other by a resilient force.

The operation of the connector 10 of this embodiment having the above-described configuration will be described below. First, the compression parts 12a, 13a of the socket body 12 and the plug body 13
The conductors of the wires 11a and 11b are respectively inserted into the holes, and the compression parts 12a and 13a are radially compressed by a compression tool from the outside, so that the socket body 12 and the plug body 13 are attached to the ends of the wires 11a and 11b, respectively. . Next, the small diameter portion 20 b of the plug body 13 is passed through the inside of the lock member 14 so that the socket hole 1
6b, and as shown in FIG.
The ends of the male threads 17 and 21 of the plug body 2 and the plug body 13 abut against the ends of the female threads 22 and 23 of the lock member 14, respectively.

In this state, the lock member 14 is rotated in one direction indicated by an arrow A in FIG. Here, in the connector 10 of the present embodiment, since the male screw 17 of the socket main body 12 and the male screw 21 of the plug main body 13 are formed so as to have a reverse screw relationship, the operator may lock the lock member 14. By simply rotating in one direction, the screwing of the male threads 17 and 21 and the female threads 22 and 23 of the lock member 14 can be started simultaneously. Thereby, the socket main body 12 and the plug main body 13 are not relatively rotated,
Moved in the directions indicated by arrows B and C, and finally,
It is attracted to the position where it comes into contact with each other, and is connected and fixed.

Then, when the electric wires 11a and 11b connected by the connector 10 of the present embodiment are energized in this manner, a current flows as shown by arrows D and E in FIG. That is, in the connector 10 of the present embodiment, the lock member 14 is brought into close contact with the socket body 12 and the plug body 13 by being screwed into the socket body 12 and the plug body 13.
In addition, since it is formed of a conductive material, current is transmitted from the plug body 13 through the contact 15 to the socket body 12 as shown by arrow D, and also through the lock member 14 as shown by arrow E. It will flow like

In this case, the peripheral groove 18 for accommodating the contact 15 is provided at a position overlapping at least a part of the male screw portion 17 of the socket portion 12b. Even if the cross-sectional area of 12b is reduced, current can flow through the route (arrow E) passing through the lock member 14. Therefore, the conductive area reduced by the peripheral groove 18 can be supplemented by the lock member 14, and heat generation in the peripheral groove 18 can be prevented.

As described above, the connector 1 according to the present embodiment
According to No. 0, the worker only has to fasten the lock member 14 in one direction in the connection work between the socket body 12 and the plug portion 13, so that the work can be simplified. In addition, the increase in the electric resistance in the thin portion formed in the socket body 12 due to the formation of the peripheral groove 18 for accommodating the contact 15 reduces the increase in the electrical resistance of the socket body 12 and the plug body 13 with a highly conductive lock member 14 screwed. In addition, it is possible to prevent inconvenience such as heat generation from occurring.

Further, a lock member 14 conventionally used only for connecting the socket body 12 and the plug body 13 is used.
Can also function as a current-carrying part, so that the peripheral groove 18 of the socket body 12 is locally thickened to increase the diameter and complicate the shape.
It is possible to configure the connector 10 having a compact and simple shape while avoiding an increase in weight due to making the whole thicker. As a result, there is an advantage that the present invention can be applied to wiring in a building where wiring space is limited.

The male thread 17 of the socket 12b is a right-hand thread, and the male thread 21 of the plug 20 is a left-hand thread. The male screw part 21 of the part 20 may be configured as a right-hand screw. In the case where the winding directions of the screw threads of the two male screw portions 17 and 21 are made to coincide with each other, the socket body 12 and the plug body 13 must be relatively rotated at the time of the fastening operation. Although the workability is reduced, it can be adopted in an application example in which the wires 11a and 11b are crimped after fastening. In addition, both male screw parts 1
The pitches 7 and 21 may be the same or different.

Next, a second embodiment of the connector according to the present invention will be described with reference to FIG. In the connector 30 according to the present embodiment, the same reference numerals are given to portions having the same configuration as the connector 10 according to the above-described first embodiment, and the description will be simplified.

The connector 30 according to the present embodiment differs from the connector 10 according to the first embodiment in the structure of the lock member 31 and the structure for assembling the lock member 31 integrally with the socket body 32. I have.

The locking member 31 of the connector 30 according to the present embodiment has a female screw part 34 screwed to the male screw part 33 of the socket body 32 and a male screw part of the plug body 35 at the center of the inner surface in the longitudinal direction. A peripheral groove-shaped relief portion 38 is provided for partitioning a female screw portion 37 screwed to the engagement portion 36. The clearance 38 has an inner diameter larger than the diameter of the root of the two female threads 34 and 37. In addition, the lock member 31 includes:
A groove-shaped through-hole 39 extending through the wall surface and extending in the longitudinal direction is provided. In the example shown in FIG. 4, the through-hole 39 is provided substantially at the center of the lock member 31 in the longitudinal direction. However, the position can be appropriately determined as needed.

An insertion portion 40 having an outer diameter smaller than the inner diameter of the lock member 31 is provided at the tip of the socket main body 32 to which the lock member 31 is assembled, adjacent to the male screw portion 33. . The insertion portion 40 has a length dimension longer than the female screw portion 34 of the lock member 31. A peripheral groove 41 is formed at the tip of the insertion portion 40, and the stopper ring (drop-off preventing means) 42 can be fixed by the peripheral groove 41.

The stopper ring 42 is, for example, a C-ring-shaped resilient member partially cut, and its diameter can be expanded or contracted in response to an external force applied in the radial direction. Then, with the insertion portion 40 of the socket body 32 inserted into the one female screw portion 34 of the lock member 31, the stopper ring 42 which is reduced in diameter and disposed in the escape portion 38 of the lock member 31 is expanded by a chamfered surface. The locking member 31 is attached to the socket main body 32 so as not to fall off by making the diameter and fitting it into the peripheral groove 41 on the outer surface of the distal end of the insertion portion 40.

According to the connector 30 of the present embodiment configured as described above, the socket body 3 crimped to the end of the electric wire is used.
2 and the plug body 35 are fitted to each other, and the lock member 3 is integrally assembled to the socket body 32.
By rotating the lock member 1 in one direction, the two female screw portions 34 and 37 of the lock member 31 are screwed into the male screw portions 33 and 36 of the socket body 32 and the plug body 35 and fastened. An effect similar to that of the first embodiment is obtained. Further, in the connector 30 of the present embodiment, since the lock member 31 is integrally attached to the socket main body 32, the worker removes the two components of the socket main body 32 and the plug main body 35 to which the lock member 31 is attached. There is an advantage in that handling is sufficient, component management is easy, and workability is good. In particular, in the case of connection work of electric wires at a high place, the number of parts to be handled is small and the operation is simple, so that the workability is extremely good.

In the connector 30 according to the present embodiment, since the lock member 31 is provided with the through hole 39, the connection state between the socket body 32 and the plug body 35 can be confirmed through the through hole 39. . That is, simultaneous rotation of the lock member 31 and the socket body 32 and the plug body 35 is started only by rotating the lock member 31 in one direction. It is conceivable that only the fastening precedes. In addition, the fastening is performed with the tip of the socket body 32,
The process ends when the tip of the large-diameter portion 35a of the plug body 35 comes into contact. However, if no confirmation is made, if the screw fastening becomes harder on the way for some reason, the fastening will not be completed. It is also conceivable that the connection work ends incompletely.

On the other hand, according to the connector 30 of the present embodiment, the connection state between the socket main body 32 and the plug main body 35 can be always checked through the through hole 39 provided in the lock member 31. , Does not occur. Further, the distal end of the socket body 32 and the distal end of the large diameter portion 35a of the plug body 35 are
Since the abutment can be made at a position where the 37 and the male screw portions 33 and 36 are completely fastened, there is an advantage that a proper connection state can be reliably achieved.

In the connector 30 according to the present embodiment, the lock member 31 is integrally assembled to the socket main body 32.
1 may be assembled to the plug body 35. Further, although the stopper ring 42 is employed as a means for preventing the lock member 31 from dropping off, instead of this, the distal end of the insertion section 40 may be caulked after the lock member 31 is inserted into the insertion section. Also, instead of the stopper ring 42, the insertion portion 4
A male screw portion of about 1-2 turns may be formed at the leading end of the zero. According to the method of caulking or the method of providing a male screw portion, there is an advantage that the number of parts can be reduced. Further, the through hole 39 provided in the lock member 31 in the second embodiment may be provided in the lock member 14 of the connector 10 according to the first embodiment.

[0042]

As described above in detail, according to the connector of the present invention, even if the thickness of the socket body is locally reduced by the formation of the circumferential groove for accommodating the contact, the locking member is provided. By providing a route passing through, there is an effect that an increase in electric resistance can be prevented. In this case, since the lock member used only for fastening the socket body and the plug body is used, the number of components is not increased, and the lock member also has a function as a conductive component. Thus, there is also an advantage that the component can be used efficiently, and the size, the diameter, the weight, and the shape can be simplified.

Further, by configuring the male screw portions of the socket body and the plug body to which the lock member is fastened in a reverse screw relationship, the socket body and the plug can be rotated only by rotating the lock member in one direction. Both can be fastened without relatively rotating the main body. Therefore, in addition to the above effects, the operation can be simplified and the number of operation steps can be reduced.

Further, in a state where the insertion portion is inserted into the lock member, a drop-off preventing means is provided at the tip of the insertion portion provided in the escape portion provided in the lock member, so that the lock member can be connected to either the socket body or the plug body. The parts are easily integrated, so parts management is easy and
There is an advantage that connection workability can be improved.

Further, by providing a through-hole penetrating the wall surface of the lock member, the connection state between the socket body and the plug body can be easily confirmed, and an appropriate connection state can be reliably achieved. It works.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state before connection of a connector according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which the connector of FIG. 1 is being connected.

FIG. 3 is a longitudinal sectional view showing a state where the connector of FIG. 1 is connected.

FIG. 4 is a longitudinal sectional view showing a connector according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing an example of a conventional connector.

[Explanation of symbols]

 10, 30 Connector 11a, 11b Electric wire 12, 32 Socket body 13, 35 Plug body 14, 31 Lock member 15 Contact 16b Socket hole 17, 21, 33, 36 Male screw part 18 Circumferential groove 20 Plug part 22, 23, 34 , 37 Female thread part 38 Escape part 39 Through hole 40 Insertion part 42 Stopper ring (measuring prevention means)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Minoru Takada 3-1, Ekimae Honcho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Japan FCI Inc.

Claims (4)

[Claims] 1. A plug body made of a conductive material which is attached to an end of one electric wire and has a rod-shaped plug at the end, and a socket which is attached to an end of another electric wire and which can insert the plug at the end. A socket body made of a conductive material having a hole, and a female threaded part screwed into a male threaded part formed in the plug body and the socket body, respectively, with the plug part inserted in the socket hole, A nut-shaped lock member for connecting and fixing the plug main body and the socket main body, and disposed between the plug part outer surface and the socket hole inner surface,
An annular contact that is resiliently brought into contact with the outer surface of the plug portion and the inner surface of the socket hole, and at the inner surface of the socket hole, at a position overlapping the male screw portion formed on the socket body in the longitudinal direction, A connector, wherein a peripheral groove for accommodating the contact is formed, and the lock member is made of a conductive material. 2. The connector according to claim 1, wherein the male screw portion of the plug body and the male screw portion of the socket body have different thread winding directions. 3. A locking member 2 which is screwed into a male screw portion of a plug body and a male screw portion of a socket body, respectively.
A relief portion having an inner diameter larger than the diameter of the valleys of these female screw portions is provided between the two female screw portions, and is locked to either the male screw portion of the plug body or the male screw portion of the socket body. An insertion portion having an outer diameter smaller than the inner diameter of the female screw portion of the member and having a length dimension longer than the female screw portion of the lock member is provided, and the escape portion is inserted into the lock member when inserted into the lock member. 3. The connector according to claim 1, further comprising: a drop-off preventing means provided at a tip of the inserted insertion portion to prevent the lock member from dropping out of the insertion portion. 4. The connector according to claim 1, wherein a through hole that penetrates a wall surface is provided at an intermediate position in a longitudinal direction of the lock member.