JP4469557B2 - Fitting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint device used when, for example, connecting a cable mounting bracket and an insulator compression bracket in a cable connecting portion such as a CV cable.
[0002]
[Prior art]
Conventionally, for example, in a cable connection portion such as a CV cable, it is common to connect a cable mounting bracket and an insulator compression bracket using a ring-shaped nut. FIG. 8 is a longitudinal sectional view showing an example of a conventional cable connection portion, and FIG. 9 is an enlarged view of a part thereof. In the figure, 1 is an insulator made of epoxy resin or the like, and the inside of the insulator 1 The central conductor 2 is embedded, and a substantially cylindrical cable fitting 3 is embedded at the end of the insulator 1 so as to be integrated with the insulator 1 by burying a part thereof in the insulator 1. Is provided.
[0003]
On the other hand, the end of the CV cable 4 to be conductively connected to the center conductor 2 is so-called stepped, and the terminal metal 5 inserted and fitted into the center conductor 2 is caulked to the conductor 4a exposed at the tip. It is attached by fixing etc. Further, around the cable insulator 4b, there is a premolded insulator 6 made of an insulating rubber 6a and a semiconductive rubber 6b, and the premolded insulator 6 is connected to the tapered surface 1b of the recess 1a of the insulator 1 and the cable insulation. A pressing metal fitting 7 is provided for press-contacting the outer peripheral surface of the body 4b.
[0004]
Around the CV cable 4, a substantially cylindrical connection fitting (compression fitting) 9 and a ring nut 10 for connecting and fixing the connection fitting 9 to the mounting fitting 3 are provided. A waterproof tape 8 or the like is wound between the cable 4 and the cable 4 in order to prevent rainwater or the like from entering through a gap between the two. The ring nut 10 abuts and engages with the protrusion 9 b of the connection fitting 9 and is rotatably arranged on the outer periphery of the connection fitting 9. The ring nut 10 is provided on the outer peripheral surface of the attachment fitting 3. The connection fitting 9 is connected and connected to the mounting fitting 3 by being screwed to the male screw 3a.
[0005]
Further, a plurality of compression coil springs 11 are provided in the circumferential direction between the substantially cylindrical connection fitting 9 and the pressing fitting 7, and each of the coil springs 11 is attached to the distal end portion 9 a of the connection fitting 9. It is positioned and held by a guide pin 12 screwed and fixed. In the figure, reference numeral 13 denotes a grounding wire for conductively connecting the shielded soft copper wire 4 c of the CV cable 4 and the connection fitting 9.
[0006]
When conductively connecting the CV cable 4 configured as described above to the central conductor 2 on the insulator 1 side, the members 5 to 10 are assembled to the cable 4 as shown in FIG. Push in 1 side. Then, first, the terminal fitting 5 provided at the tip of the cable 4 is inserted and fitted into the central conductor 2, and the premolded insulator 6 and the pressing fitting 7 enter the recess 1 a of the insulator 1.
[0007]
Next, the ring nut 10 provided on the outer periphery of the connection fitting 9 is screwed into the male screw 3a of the attachment fitting 3, whereby the connection fitting 9 is connected and connected to the attachment fitting 3, and the connection fitting 9 and The premold insulator 6 is pressed against the tapered surface 1b of the insulator 1 and the cable insulator 4b via the press fitting 7 by the compression coil spring 11 interposed between the press fitting 7 and the premold insulator 6 The tapered surface 1b and the cable insulator 4b are in close contact with each other with a predetermined pressure.
[0008]
[Problems to be solved by the invention]
However, when the cable mounting bracket 3 and the connection bracket 9 are connected by the ring nut 10 as described above, the ring nut 10 must be rotated with a tool or the like, so that work in a narrow place is difficult. In addition, in the case where a large number of compression coil springs 11 are interposed in the circumferential direction between the cylindrical connection fitting 9 and the pressing fitting 7 as in the illustrated example, the springs 11 are kinked in the circumferential direction. The cable mounting bracket 3 and the connection bracket 9 must be connected by the ring nut 10 while being compressed so that there is no compression. For this reason, there are problems such as inefficiency, requiring a lot of labor and time for connection work.
[0009]
The present invention has been proposed in view of the above-described problems, and provides a joint device that can easily and quickly connect a cylindrical body or a rod-shaped body such as the mounting bracket 3 and the connection bracket 9 as described above. For the purpose.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the joint device according to the present invention has the following configuration. That is, a pair of ring-shaped protrusions (32, 33) and (92, 93) are formed on the outer peripheral surface of the end of the cylindrical body or rod-shaped body (3, 9) to be connected to each other, and A pair of semicircular arcs each having a concave groove (31, 91) formed between the protruding parts and having inwardly protruding parts (21, 22) engaged with both concave grooves (31, 91) at both axial ends. Are arranged in a circular shape on the outer periphery of the end of the cylindrical body or rod-shaped body (3, 9), and at the same time, a band body (25) holding both the coupling metal (20, 20). ) Is provided on the outer periphery of both the connecting fittings (20, 20), and the cylindrical body or rod-like body (3, 9) is inserted into one protrusion (22) of the connecting fitting (20, 20). tapered chamfered portion serving as a guide surface is provided with the (22a), the radial height of said one protrusion (22) Formed gradually lowered toward the both ends in the circumferential direction, the inner peripheral surface at both end portions in the circumferential direction of said one protrusion (22), the inward projection of the connecting fitting (20, 20) (21 , 22) is formed to have a diameter substantially the same as or slightly larger than the outer diameter of the projection (92) of the cylindrical body or rod-shaped body (3, 9) inserted between them.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a case where the present invention is applied to a cable connecting portion of a CV cable will be described in detail based on an embodiment shown in the drawings.
[0012]
1 is a longitudinal sectional view of a cable connecting portion to which a joint device according to the present invention is applied, FIG. 2 is an enlarged view of a part thereof, FIG. 3 (a) is an enlarged view of a main portion in which an internal mechanism and the like are omitted, b) is an exploded view thereof, and members having the same functions as those in the conventional example are denoted by the same reference numerals and redundant description is omitted.
[0013]
In the present embodiment, the cable mounting bracket 3 and the connection bracket 9 as a cylindrical body in the cable connection portion are connected to a pair of substantially semicircular arc-shaped connection brackets 20 and 20 and a band body 25 that holds both the connection brackets. It is connected with.
[0014]
As shown in FIGS. 3 and 4, both the connecting metal fittings 20 and 20 are formed of a semicircular metal steel material having a predetermined width W in the axial direction, and a cable is provided on each inner surface side of both ends in the width direction. Inward ring-shaped protrusions 21 and 22 that fit into ring-shaped concave grooves 31 and 91 formed on the outer peripheral surfaces of the mounting bracket 3 and the connecting bracket 9 are formed.
[0015]
Between the protrusions 21 and 22, there is formed a substantially semicircular arc-shaped recess 23 in which the ring-shaped protrusions 32 and 92 formed on the mounting bracket 3 and the connecting bracket 9 are almost fitted. The depth of 23 in the radial direction is equal to or slightly deeper than the height of the protrusions 32 and 92 in the radial direction. The width of the recess 23 in the axial direction is equal to or slightly larger than the length of the projections 32 and 92 plus the width in the axis direction, and the bottom surface of the recess (between the projections 21 and 22). The inner surface of each of the connecting fittings 20 is formed so as to have a diameter substantially the same as or slightly larger than the outer diameter of the protrusions 32 and 92. The protrusion 92 is provided with a tapered chamfered portion 92a that serves as a guide surface when the protrusion 92 is inserted into the recess 23. Further, the projections 33 and 93 higher than the projections 32 and 92 are provided on the outer side of the projections 21 and 22 on the mounting bracket 3 and the connection bracket 9, respectively. The connection fitting 20 and the band body 23 are configured to be positioned.
[0016]
In addition, one protrusion 21 of the protrusions 21, 22, in this embodiment, the protrusion 21 that fits into the groove 31 of the cable mounting bracket 3 is formed in a substantially constant cross-sectional rectangular shape over the entire length in the circumferential direction, The protrusion 21 has an axial width and a radial height that are substantially the same as or slightly smaller than the axial width and the radial height of the groove 31. In addition, the width in the axial direction of the other protrusion 22, in the present embodiment, the longitudinal center of the protrusion 22 that fits into the concave groove 91 of the connection fitting 9 (the center in the circumferential direction of the semicircular arc connecting fitting 20) The height in the radial direction is substantially equal to or slightly smaller than the width and height in the axial direction of the concave groove 91.
[0017]
Further, a tapered chamfered portion 22a is provided between the outer side surface and the inner peripheral surface of the protrusion 22 as a guide surface when the protrusion 92 of the connection fitting 9 is inserted. The inner peripheral surface is formed to have a diameter substantially the same as or slightly larger than the outer diameter of the protrusion 92 of the connection fitting 9. As a result, the height of the protrusion 22 in the radial direction is configured to gradually decrease toward both ends of the semicircular arc connecting fitting 20 as shown in FIG.
[0018]
Further, in the present embodiment, the band body 25 is a non-circular spring plate as shown in FIG. 5, and the width of the band body 25 in the axial direction is equal to the axial width of the connecting fitting 20 or It is formed slightly narrower than that. Further, the inner diameter of the cut-off band body 25 in a free state is formed smaller than the outer diameter of the connecting metal fitting 20 when both the connecting metal fittings 20 are fitted to the mounting metal fitting 3 and the connecting metal fitting 9. When fitted to the outer peripheral surfaces of the two connecting fittings 20, each connecting fitting 20 is always tightened radially inward.
[0019]
In the above configuration, when the CV cable 4 is conductively connected to the central conductor 2 on the insulator 1 side, the inwardly protruding portions 21 of both the connecting metal fittings 20 and 20 are previously connected as shown in FIGS. 6 and 7A. While fitting in the concave groove 31 of the cable mounting bracket 3, the band body 25 is fitted to the outer peripheral surfaces of the both coupling brackets 20, 20 to hold the both coupling brackets 20, 20 at the end of the mounting bracket 3. Moreover, in the state which assembled | attached each member 5-10 to the cable 4 similarly to the said prior art example, they are pushed in to the insulator 1 side. Then, the terminal fitting 5 provided at the tip of the cable 4 is inserted and fitted into the center conductor 2, and the premolded insulator 6 and the pressing fitting 7 are inserted into the recess 1 a of the insulator 1.
[0020]
At the same time, after the distal end portion 9a of the connection fitting 9 has entered the inside of the cable attachment fitting 3, the projection 92 of the connection fitting 9 advances toward the inside of the connecting fittings 20 and 20. At this time, the protrusion 92 is formed on the two connecting fittings 20 against the tightening force of the band body 25 by the tapered chamfered portions 92 a and 22 a formed on the protrusion 92 and the inward protruding portion 22 of each connecting fitting 20. -Entering the inside of the projection 22 while pushing 20 outward. At that time, the inner peripheral surface of the protrusion 22 is formed to have the same diameter or slightly larger than the outer diameter of the protrusion 92, so that the protrusion 92 is particularly caught at both ends of the protrusion 22. It is possible to enter smoothly.
[0021]
When the connection fitting 9 further advances toward the attachment fitting 3, the projection 92 enters the recess 23 of each connection fitting 20, and at the same time, each connection fitting that is always tightened inward by the band body 25. Twenty protrusions 22 are fitted in the concave grooves 91 of the connection fitting 9. Thereby, the connection fitting 9 and the attachment fitting 3 can be easily connected. At this time, the pre-mold insulator 6 is brought into close contact with the insulator 1 and the cable insulator 4b with a predetermined pressure by the compression coil spring 11 interposed between the connection fitting 9 and the pressing fitting 7. The same as in the example.
[0022]
As described above, in the present invention, the connection fitting 9 and the attachment fitting 3 can be easily and quickly connected simply by moving the connection fitting 9 together with the cable 4 toward the attachment fitting 3 and the insulator 1. In addition, after the connection, even if the force in the direction in which the mounting bracket 3 and the connection bracket 9 are separated from each other acts, the side surfaces of the projections 21 and 22 of the coupling bracket 20 and the recesses of the mounting bracket 3 and the connection bracket 9 are obtained. Since the side surfaces of the grooves 31 and 91 are in contact with each other on a relatively wide surface, the connection state can be maintained stably and reliably for a long period of time without inadvertent separation. Moreover, in the case where the mounting bracket 3 and the connection bracket 9 are urged away from each other by the compression coil spring 11 or the like in the connected state as in the illustrated example, the side surfaces of the protrusions 21 and 22; The side surfaces of the concave grooves 31 and 91 can be in constant pressure contact to prevent backlash.
[0023]
Further, in order to release the connection between the mounting bracket 3 and the connection bracket 9, it is only necessary to remove the band body 25 and detach the coupling bracket 20 outward in the radial direction. In the case where the metal fitting 3 and the connection metal fitting 9 are biased in a direction away from each other, after the band body 25 is removed, the attachment metal fitting 3 and the connection metal fitting 9 are drawn together in a direction approaching each other. The metal fitting 20 can be easily detached.
[0024]
In the above-described embodiment, the tapered chamfered portion serving as a guide surface when the connection fitting 9 is inserted inward of the two connection fittings 20 is formed by the protrusion 22 of the connection fitting 20 and the protrusion 92 of the connection fitting 9. Although provided in both, it may be provided only in one of them. Further, the mounting bracket 3 and the connection bracket 9 have their ends, in the illustrated example, the projections 32 and 92 of the connection bracket 3 and the connection bracket 9 are brought into contact with each other, and then both the coupling brackets 20 and 20 are put on the outer periphery thereof. At the same time, the band body 25 may be fitted and connected to the outer periphery thereof. In that case, the chamfered portion can be omitted.
[0025]
Further, the band body 25 is not limited to the non-circular spring plate as shown in the illustrated example. For example, a rubber band or the like may be used. If it is the structure which can maintain the engagement state with the protrusions 21 and 22 and the recessed grooves 31 and 91 of the attachment metal fitting 3 and the connection metal fitting 9, the force which clamp | tightens each connection metal fitting 20 in radial direction as above-mentioned necessarily. It may be a thing which does not have.
[0026]
Further, in the cable connection portion of the illustrated example, the connection fitting 9 is attached to the cable 4 with the bellows-shaped waterproof cover 14, the waterproof tape 8, and the fixing band 15, but the connection fitting 9 is attached to the cable 4. The structure is appropriate, and the present invention is not limited to the cable connecting portion as shown in the illustrated example, and can be applied to other various cable connecting portions. Furthermore, the present invention can be applied to devices other than the cable connecting portion, and can be applied to a case where, for example, a cylindrical body such as a pipe or a pipe or a rod-shaped body such as various shafts is connected.
[0027]
【The invention's effect】
As described above, in the joint device according to the present invention, each of the cylindrical bodies or rod-shaped bodies to be connected to each other has a concave groove formed on the outer peripheral surface of the end, and the inward protrusions that engage with the concave grooves are axial lines. A pair of semicircular arc connecting fittings at both ends in the direction are arranged on the outer periphery of the end of the cylindrical body or rod-like body to be connected to each other, and a band body that holds both the connecting fittings is connected to both the connecting fittings. The cylindrical body and the rod-shaped body can be connected easily, quickly and surely by an extremely simple configuration only provided on the outer periphery of the steel, and there is an effect that it is possible to provide a reliable and durable joint device at low cost. .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a cable connecting portion to which a joint device according to the present invention is applied.
FIG. 2 is an enlarged view of a part of the cable connecting portion.
FIG. 3A is an enlarged view of a main part in which an internal mechanism and the like of the cable connection part are omitted.
(B) is an exploded view thereof.
FIG. 4A is a longitudinal front view of a connecting metal fitting.
(B) is the side view.
(C) is the cc sectional view taken on the line in (a).
FIG. 5A is a front view of a band body.
(B) is the side view.
FIG. 6 is a longitudinal sectional view showing a state where the cable connecting portion is connected.
FIG. 7A is an enlarged longitudinal sectional view of a main part in a state where the cable connecting part is connected.
(B) is the same figure in the connected state.
FIG. 8 is a longitudinal sectional view of a conventional cable connection portion.
FIG. 9 is an enlarged view of a part of the cable connecting portion.
FIG. 10 is a longitudinal sectional view showing a state where the cable connecting portion is connected.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulator 2 Center conductor 3 Cable attachment metal fitting 4 Cable 5 Terminal metal fitting 6 Premold insulation 7 Press metal fitting 8 Waterproof tape 9 Connection metal fitting 11 Compression coil spring 12 Guide pin 20 Connecting metal fittings 21 and 22 Protrusion 23 Recess 25 Band body 31 91 Groove 32, 33, 92, 93 Projection

Claims (1)

A pair of ring-shaped protrusions (32, 33) and (92, 93) are formed on the outer peripheral surface of the end of the cylindrical body or rod-shaped body (3, 9) to be connected to each other, and each of the protrusions A pair of semicircular arc-shaped connections having inwardly protruding portions (21, 22) at both ends in the axial direction, in which concave grooves (31, 91) are formed between the grooves, and both concave grooves (31, 91) are engaged. The metal fittings (20, 20) are arranged in a circular shape on the outer periphery of the end of the cylindrical body or rod-like body (3, 9), and the band body (25) holding both the connecting metal fittings (20, 20) is provided. A guide surface provided on the outer periphery of both the coupling fittings (20, 20) and for inserting the cylindrical body or rod-like body (3, 9) into one protrusion (22) of the coupling fitting (20, 20). provided with a to become tapered chamfered portion (22a), the radial height of said one protrusion (22) is a circumferential direction Formed gradually lowered toward the both ends of the inner peripheral surface at both end portions in the circumferential direction of said one protrusion (22), the inward projection of the connecting fitting (20, 20) (21, 22 The joint device is formed to have a diameter substantially the same as or slightly larger than the outer diameter of the protrusion (92) of the cylindrical body or the rod-shaped body (3, 9) inserted between them.

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