JPH067582Y2 - Cable connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of the Invention> The present invention relates to a cable connecting device using a connector with a waterproof function.

<Prior Art and Problems> As a conventional device of this type, as shown in FIG. 4, a rubber packing 103 is interposed between a connector body 101 and a case 102, and the connector body 101 and the case 102 are screwed together. The body 104 is bound together, and the elastic force of the rubber packing 103 causes both
There is a waterproof joint of 101 and 102.

However, in the above-described configuration, the connector body 101 and the case 102 must be screwed with a screwdriver using a plurality of screw bodies 104, which requires a large number of work steps and is inferior in assemblability. Moreover, there is a problem that the variation in the tightening force of the screw body 104 directly affects the waterproof property due to the elastic deformation of the rubber packing 103.

<Purpose of the Invention> The present invention has been made in order to solve the problems of the above-mentioned conventional ones, and an object thereof is to provide a cable connecting device which is excellent in waterproof performance and which can simplify the assembling work.

<Structure and Effect of the Invention> A cable connecting device according to the present invention includes a connector body having a connection terminal to which a cable core wire is electrically connected to a rear end surface of the connector body and a rear portion of the connector body mounted on the rear side. A cylindrical case through which a cable is inserted through the end opening, and a C-shaped spring that is removably engaged with an annular recess formed in the inner peripheral surface of the case is fitted to the rear outer peripheral surface of the connector body. Then, on the outer peripheral surface of the rear part of the connector body,
An O-ring that is pressed against the inner peripheral surface of the case is fitted.

According to this invention, the C-shaped spring and the annular recess are engaged with each other by a one-touch operation for fitting the case to the rear portion of the connector body, and the assembling property can be improved, and moreover, the case and the connector body can be connected. When fitted, the O-rings between them can be pressed against each other to effectively exert waterproofness. In particular, the elastic deformation of the O-rings is constant, so waterproofing characteristics are better than those of conventional screw-fastened type. It also eliminates the risk of variations.

<Description of Embodiments> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an example of a cable connecting device according to the present invention.

The circular connector 1 in the cable connection device of this example is
A reverse type connector body to which the cable M is connected, an annular fixture 3, a tubular case 4, a tubular seal cap 5, and the like are provided.

The structures on the side of the connector body 2 and the case 4 are shown in FIGS. 2a and 2b.

In the figure, the connector body 2 is formed of an electrically insulating synthetic resin or the like into a substantially cylindrical shape, and the fixing member 3 is provided on the outer peripheral surface of the front portion 2a.
Is rotatably fitted to the outside, and the fixing member 3 is attached to the central portion.
The retaining annular projection 11 is integrally formed. 12
Is a connector body fitting hole formed in the fixture 3. 1
An O-ring 3 is located on the front side of the annular convex portion 11 and is fitted on the outer peripheral surface of the front portion of the connector body 2. A hollow portion 14 is formed in the connector body 2 along the axial direction, and a contact 15 is accommodated in the hollow portion 14. A socket-shaped portion 15a is formed at a front end portion of the contactor 15, and a rear end portion 15b is projected to the outside from a rear end surface of the connector body 2 as a connection terminal and electrically connected to the core wire Ma of the cable M. It is connected.

Reference numeral 16 denotes a first annular groove formed on the outer peripheral surface of the rear portion 2b of the connector body 2, and the first annular groove 16 has:
A C-shaped spring 17 for locking the case is fitted, and its surface is set to float from the outer peripheral surface.
A second annular groove 18 is formed behind the annular groove 16, and an O-ring 19 pressed against the inner peripheral surface of the case 4 described later is fitted in the second annular groove 18. . 20
Is a threaded portion formed on the inner peripheral surface of the fixture 3.

An annular recess 21 is formed on the inner peripheral surface of the case 4 at the front end side. This is the above C-shaped spring 1
It engages with 7 in a detachable manner. Reference numeral 22 is a cable fitting hole in the case 4, and 23 is a cable inserting opening that is connected to the rear side of the fitting hole 22, and the inner peripheral surface thereof is formed in a rearward widened shape. Reference numeral 24 denotes a screw portion formed on the outer peripheral surface of the rear portion of the case 4.

The structure around the case 4 and the seal cap 5 will be described with reference to FIGS. 3a and 3b.

In the figure, the seal cap 5 is detachably fitted to the case 4 by screwing a screw part 25 formed on the front inner peripheral surface of the seal cap 5 into the screw part 24 on the case 4 side. ing. Reference numeral 26 is a cable insertion hole formed on the rear surface of the seal cap 5. Reference numeral 27 is a cable fixing ring fitted to the cable M and made of synthetic resin or the like, and a plurality of elastic members whose distal end extends toward the outer peripheral surface of the cable M at positions equidistantly arranged in the circumferential direction on the rear edge thereof. The claw 28 is integrally formed. These elastic claws 28 are
By forming the slot 29 on the peripheral wall of the fixing ring 27, it can be easily manufactured. Reference numeral 30 denotes a cylindrical rubber bush fitted into the cable M, and when the seal cap 5 is screwed onto the case 4, the taper inner peripheral surface of the cable insertion opening 23 of the case 4 and the fixing It is adapted to be pressed against the inner peripheral surface of the ring 27.

Next, a procedure for assembling the cable connecting device having the above configuration will be described.

As shown in FIGS. 2a and 3a, the cable M is sequentially inserted into the seal cap 5, the cable fixing ring 27, the rubber bush 30 and the tubular case 4, and then the core Ma of the cable M is attached to the connector body 2 side. Connection terminal 15b
It is electrically connected and fixed by soldering.

Then, the cylindrical case 4 is fitted into the rear end portion 2b of the connector body 2 as shown in FIG. 2b, and is operated to fit in the annular recess 21 of the inner peripheral surface of the case 4 in the substantially C-shaped spring on the connector body 2 side. Since 17 is elastically coupled, the connector body 2 and the case 4 are coupled.

Further, the rubber bush 30 is brought into contact with the tapered inner peripheral surface of the case insertion opening 23 of the case 4, the fixing ring 27 is externally fitted to the rubber bush 30, and the screw portion 25 of the seal cap 5 is screwed into the case 4. When it is screwed into the portion, the rubber bush 30 is press-fitted into the opening 23 as shown in FIG. 3b,
It is fixed together with the fixing ring 27.

Here, since the C-shaped spring 17 engaged with the annular recess 21 on the case 4 side and the O-ring 19 pressed against the inner peripheral surface of the case 4 are fitted on the rear outer peripheral surface of the connector body 2, Both cases 2 and 4 can be joined by a one-touch operation of fitting the case 4 onto the rear portion of the connector body 2, and the assembling work can be performed efficiently. Moreover, since the locked state can be obtained with a fixed amount of fitting during the fitting operation of the case 4, it is easy to determine that the both 2 and 4 have been completely assembled.

Further, in the assembled state of the connector body 2 and the case 4, the O-ring 19 is pressed against the inner peripheral surface of the case 4 and elastically deforms, so that the elastic reaction force of the O-ring 19 causes the outer peripheral surface of the connector body 2 and the case 4 to move. It can be adhered to the inner peripheral surface, and good waterproofness can be imparted between the both 2 and 4.

In particular, since the elastic deformation of the O-ring 19 is constant regardless of the engagement between the C-shaped spring 17 and the annular recess 21, there is no variation in the waterproof property unlike the conventional screw-fastened type. , Reliability will be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an example of a cable connecting device according to the present invention, and FIGS. 2a and 2b show the structure of a connector body and a case side of the cable connecting device, respectively. Partially cutaway plan view showing the state before and after assembly,
FIGS. 3a and 3b are partially cutaway plan views showing configurations of a connector body and a seal cap side in the cable connecting device before and after assembly, respectively.
FIG. 4 is a side view showing an example of a conventional cable connecting device. 2 ... Connector body, 4 ... Case, 15b ... Connection terminal, 2
3 ... Opening, 17 ... C-shaped spring, 19 ... O-ring, 2
1 ... Annular recess, M ... Cable, Ma ... Core wire.

Claims (1)

[Scope of utility model registration request] 1. A connector main body having a connection terminal to which a cable core wire is electrically connected to a rear end surface of the connector main body, and a cylindrical case mounted on the rear side of the connector main body for inserting the cable through a rear end opening. And a C-shaped spring releasably engaged with an annular recess formed in the inner peripheral surface of the case on the rear outer peripheral surface of the connector body. A cable connecting device in which an O-ring which is pressed against the inner peripheral surface of the case is fitted.