Improvements relating to multi-core cable connectors

Description: TECHNICAL FIELD [Detailed description of the invention]

[Industrial application field] In the present invention, the cable connected by connecting the core wire terminal to the connection terminal provided on the body of the light electric device such as a transformer, radio, tape recorder, connector, etc. does not come out from the body of the light electric device by pulling. As described above, the present invention relates to an improvement of a cable retaining device that is held against the body of the light electric device.

[Conventional technology] In the past, the means to prevent the cable connected to the body of a light electric device from coming out of the body of the device was to cut off the end of the outer skin and expose the core wire to the outer circumference of the end of the cable. By wrapping a clamp formed in the shape of a C-shaped retaining ring or a binding band and narrowing it down in the direction of reducing the diameter from the outer peripheral side of the cable of the clamp, the clamp is crimped to the outer peripheral surface of the cable, and the clamp in that state is placed. The first means of fixing the cable to the device via a clamp by locking it to the locking part provided around the cable outlet of the device and fixing it so that it does not move in the axial direction of the cable. is there. Further, the cable outlet formed in the body of the device which is formed in two in the upper and lower parts, and the protruding portion protruding toward the center of the cable outlet from the left and right inner wall surfaces facing the cable outlet, and the cable outlet. Protruding pieces are provided so as to rise from the left and right central parts of the bottom wall of the cable outlet, and the cable pushed into the cable outlet is bent and meandered so that the outer peripheral surface of the cable becomes the inner wall surface of the cable outlet. There is a second way to get involved in. Also, after inserting the cable into the cable outlet of the device's body, push the pyramid-shaped insertion piece that expands between the covered core wires of the cable from the inside of the device toward the cable's outlet of the device. , There is a third means of crimping and fixing the covered core wire of the cable and the outer skin of the cable to the inner peripheral edge of the cable outlet of the device.

[Problems to be solved by the invention] However, in the first means, these conventional means cover the outer skin of the cable and the core wire, although the outer peripheral side of the outer skin of the cable is crimped and engaged with the device via a clamp. Since the crimping and engagement with the inner skin is inevitably insufficient, when the cable is pulled strongly, the inner skin that covers the inner core wire is pulled by the elongation of the outer skin, so that the cable of the outer skin of the cable is used. At the inner position of the bound part, the inner skin covering the core wire moves in the axial direction with respect to the outer skin, which causes the connection between the core wire of the cable and the connection terminal of the device to be disconnected, resulting in poor continuity. Also, inside the part where the outer skin of the cable is fastened with a clamp, the inner skin that covers the core wire moves in the axial direction with respect to the outer skin, so that the inner diameter of the core wire of that part shrinks due to elongation. , There is a problem that the cable is loosened by the clamp and the cable comes out of the clamp. In addition, the third means is to engage the outer skin of the cable and the inner skin that covers the core wire to the body of the device. By inserting the insertion piece between the core wires of the cable inside the body and pushing it toward the cable outlet of the device, the outer skin of the cable and the core wire can be inserted into the cable outlet of the body. Since the work is performed by pressure contacting the inner peripheral surface of the wire, there are problems that the work of pushing the insertion piece is troublesome, the workability is poor, and the pushing is often uncertain. In addition, when a strong tensile force is applied to the cable, the inner skin and the inner skin covering the core wire of the cable are stretched to reduce the wall thickness of the cable, thereby pressing the cable in the expansion direction by pushing the insertion piece. It is planned that the outer skin and core wire of the cable will be pulled out in the pulling direction due to loosening of the cable, and when that happens, the outer skin and core wire pulled out will pull out the insertion piece and expand again. Although the pressing force in the direction is restored, there is a problem that the insertion piece is uncertain at this time and the cable cannot be pulled out properly due to the extension of the exodermis and the inner skin. Moreover, it is difficult to press the outer skin of the cable and the inner skin covering the core wire with the peripheral surface of the insertion piece to the inner peripheral surface of the cable outlet of the device with uniform pressure, and it is inevitably unevenly pressure-welded. When the cable is stretched due to a strong tensile force acting on the cable, the outer skin also touches the inner peripheral surface of the cable outlet of the device. There is a problem that the thickness of the wire becomes thinner due to the elongation of the wire, which loosens the pressing force of the insertion piece, pulls out the core wire, and causes a disconnection in the connection portion. The present invention has been made to solve the above-mentioned problems caused by the conventional means, and the outer skin and the core wire of the cable are kept in a state of being firmly connected so as to form one rigid body. Even if the outer skin of the cable and the inner skin that surrounds the core wire are stretched by applying a strong tensile force to the cable by firmly engaging the cable in the state with the outlet of the cable of the body, the core wire The new cable can be securely held to the device's body without disconnecting the cable from the device's connection terminal or loosening the binding by the clamp that holds the cable to the device. The purpose is to provide various means.

[Means to solve problems] Therefore, the present invention has been completed based on the findings obtained by repeating various studies for this purpose. That is, in order to retain the cable at the cable outlet of the device, the means for binding the cable from the outer circumference with a clamp has a limit in tightening by binding due to the strength of the clamp itself, so the tightening is maximized. Even if it is made strong, the inner skin that covers the core wire wrapped in the outer skin of the cable is not deformed so that it wraps around like the outer skin, and the inner skin that covers the core wire is almost undeformed. To be held in. And it has become clear that this causes the above-mentioned problems. From this, when the cable is fastened from the outer peripheral side by the clamp, a hard wedge-shaped body serving as a core material is pushed into the central portion of the bundle of core wires wrapped by the inner skin, and this wedge-shaped body is pushed. When the inner skin covering the core wire and the outer skin wrapping those bundles were bound by a clamp on the peripheral surface of the core, the outer skin of the cable, the inner skin wrapping the core wire, the wedge-shaped body, and the clamp were found. At the binding part by the clamp, it will be in a state of being tightly connected so as to become an integral rigid body, and the cable in this state is inserted into the cable outlet of the device, and the binding part by the clamp is combined with the clamp. This is because the result that the cable can be fixed to the device extremely firmly was obtained by engaging the cable with the body of the device by engaging with the locking portion provided on the device. From this, in the present invention, as a means for achieving the above-mentioned object, a bundle of a plurality of core wires each coated with the endothelial a is formed from the end of the cable coated with the outer skin to the outer skin. A part of the core wire is cut off to expose the bundle of core wires, and a wedge-shaped body with a posture along the axial direction of the core wire is placed at the center of the bundle of core wires from the end side of the cable to the outer peripheral surface of each inner skin of the core wire. A portion of the outer peripheral surface of the cable corresponding to the intermediate portion in the longitudinal direction of the outer peripheral surface of the body of the wedge-shaped body is narrowed in the reduced diameter direction by a clamp wound around the outer peripheral surface of the cable. The clamp, the outer skin of the cable, the inner skin of the core wire, and the wedge-shaped body b are tied together so as to be rigid, and a clamp at the tied portion of the tied cable is provided around the cable outlet of the device body. It proposes a cable retaining device that locks the cable to a stop and pulls the cable out from the cable outlet.

[Example] Next, an embodiment will be described in detail with reference to the drawings. FIG. 1 is a perspective view during assembly of a light electric device capable of carrying out the means of the present invention. In the figure, 1 is a body of a light electric device A, 2 is a connector body, a is a cable, b is a wedge-shaped body, and c is a wedge-shaped body. Indicates a clamp. The light electric device A is a multi-core type connector in this embodiment, and the body 1 of the light electric device A has an upper half side 1a and a lower half side 1b molded from a metal material (or a synthetic resin material) in a shell shape. It is a case that can be assembled in a box shape by closing and integrally connecting. The connector main body 2 is configured by holding the contact 20 ... In the pole holding hole of the block-shaped pole holding member 2a formed of a synthetic resin material. When the above-mentioned body 1 is molded of a synthetic resin material, the block-shaped pole holding member 2a is covered with an outer wall 2b made of a metal material as shown by a chain line in FIG. Will be done. As shown in FIG. 2, the cable a is formed by bundling a plurality of core wires 30 ... covered with an endothelium 30a ... made of an insulating material such as a synthetic resin material, and forming a mesh around the outer periphery of the core wires 30. It is a normal cable that is wrapped with a knitted shielded wire 31 and further covered with an outer skin 32 made of an insulating material such as a synthetic resin material on the outer circumference thereof. The cable a may have a form in which the shielded wire 31 is omitted, and the number of core wires 30 ... may be any number as long as it is two or more. The wedge-shaped body b is made of a metal material or a synthetic resin material, and as shown in FIGS. 3 and 4, the wedge-shaped body b is an elongated cone-shaped body main body 40 that gradually tapers toward the tip side (the right end side in FIG. 3). A screw formed by providing a head 41 having an enlarged diameter on the base end side of the body and spirally providing a ridge 42 on the peripheral surface of the body body 40 is used. Then, this wedge-shaped body b has a plurality of core wires 30 ... that are bundled together and wrapped by the outer skin 32 of the cable a, and the axial direction is the axial direction of the cable a at the central portion of the bundle. By pushing in from the end side of the cable a, the cable a is pierced into the central portion of the cable a. The wedge-shaped body b may be pushed into the central portion of the bundle of the core wires 30 ... of the cable a by screwing using the spiral ridge 42. Further, the wedge-shaped body b is pushed in before the cable a is fastened by the clamp c or in a state where the binding by the clamp c is loosened. FIGS. 5 and 6 show a modified example of this wedge-shaped body b. The wedge-shaped body b of this example forms a body body 40 into an elongated cone shape that gradually tapers toward the tip side. Forming a spiral ridge 42 on the peripheral surface of the spiral ridge 42 to form a screw is the same as the example shown in FIGS. 3 and 4 above, but the head 41 having an enlarged diameter on the proximal end side is formed. It is not in the form. When the wedge-shaped body b is formed into a screw by providing a spiral ridge 42 on the peripheral surface of the body body 40, the wedge-shaped body b may be formed into a screw shaft shape having the same diameter up to the tip like a tapping screw. Next, FIGS. 7 and 8 show different examples of the wedge-shaped body b. In this embodiment, the ridges 42 formed on the outer peripheral surface of the body body 40 of the wedge-shaped body b are divided into a large number of scaly protrusions 43 ... This is an example in which 43 ... are formed in parallel in a rack shape along the axial direction of the body body 40. In the example shown in FIG. 7, the rows of the scaly protrusions 43 ... provided on the peripheral surface of the main body 40 are arranged in four equal parts in the circumferential direction as shown in FIG. Although they are provided at each position, as shown in Fig. 9, the number of rows may be set appropriately, such as providing only on the left and right sides of the main body 40 to form two rows. Is. Next, FIGS. 10 and 11 show a further different embodiment of the wedge-shaped body b. In this embodiment, the body body 40 of the wedge-shaped body b is formed in a shaft shape, a head 41 whose diameter is expanded on the base end side thereof is formed, and a cone-shaped diameter-expanded portion 44 is formed on the tip end side. This is an example in which the wedge-shaped body b is placed on the outer end surface of the head 41 of the head 41 of the core wire 30 ... Wrapped by the outer skin 32 of the cable a. A fitting portion 41a is formed to fit the tip of a pushing tool (not shown) when pushing into the central portion. The fitting portion 41a may be appropriately used in each of the above-described embodiments. Next, FIG. 12 shows yet another embodiment. In this embodiment, a reduced diameter portion 45 having a width corresponding to the axial width of the clamp c is provided at an intermediate portion in the axial direction of the peripheral surface of the body body 40 of the wedge-shaped body b, and the cable a is connected by the clamp c. This is an example in which the constricted part of the cable a is fitted into the reduced diameter portion 45 when the cable a is tied up, and the diameter of the head is enlarged on the base end side of the body body 40. Although the portion 41 is formed, the head 41 may be omitted. 13 and 14 then show a further different embodiment of the wedge b. In this embodiment, the body body 40 of the wedge-shaped body b is formed in the shape of a shaft rod with a sharp tip, and the head 41 having an enlarged diameter is provided on the base end side thereof, and is formed in the shape of a nail as a whole. On the peripheral surface of the body 40 of the body, grooves or ridges 46 ... in a direction orthogonal to the axial direction are formed so as to be aligned in the axial direction. The wedge-shaped body b of this embodiment may be formed in the shape of a nail without a head by omitting the head 41 formed on the base end side of the body body 40. Next, FIGS. 15 and 16 show an example of the wedge-shaped body b in yet another form. In this embodiment, the core wire 30 ... in a state where the peripheral surface of the body body 40 formed in the shape of a wedge-shaped body b is covered with the inner skin 30a of the cable a is the peripheral surface of the inner surface 30a of the core wire 30. This is an example in which a recessed groove-shaped fitting groove 47 ... is formed along the axial direction of the body body 40 so as to fit a part in the circumferential direction. Then, in this example, in the above-mentioned recessed groove-shaped fitting groove 47 ... formed on the peripheral surface of the body body 40, the cable a bundles four core wires 30 ... Inside the cable a. When it is in the form of being stored together in, as shown in Fig. 16, it is formed in four equal parts in the circumferential direction of the peripheral surface of the main body 40, and four core wires are formed. When the cable a corresponds to 30 ... and the cable a is in the form of storing three core wires 30 ... in a bundle, as shown in FIG. , This recessed groove-shaped fitting groove 47 ... is formed at each of the three equal parts of the peripheral surface of the main body 40 in the circumferential direction to correspond to the three core wires 30 ... , When the cable a is in the form of storing two core wires 30 ... in a bundle, it is provided on the left and right sides of the main body 40, respectively, and the two core wires 30. It is designed to correspond to .. Further, in these recessed groove-shaped fitting grooves 47, ridges 48 ... In a direction orthogonal to the longitudinal direction thereof are provided in parallel in the longitudinal direction on the inner wall surface thereof. This ridge 48 ... may be omitted. Further, as in the example shown in FIG. 12 described above, the fitting groove 47 may be provided with a reduced diameter portion 45 in the middle in the longitudinal direction. Further, the enlarged head 41 provided on the base end side may be omitted as in the embodiment shown in FIG. As shown in FIG. 20, the clamp c is a normal clamp made of a metal material or a synthetic resin material and formed in a C-shaped retaining ring shape having a fissure portion 50 in a part in the circumferential direction. A serrated ridge 51 ... is formed. The diameter of the clamp c is expanded so as to open a fissure portion 50 opened in a part in the circumferential direction, and the clamp c is fitted and inserted so as to be wound around the outer skin 32 of the cable a from the fissure portion 50. By deforming the cable a by pressing it in the direction of shrinking the diameter and crushing it, the cable a is narrowed down and crimped, and then the clamp c in this state is preliminarily placed around the cable outlet 10 of the body 1. It is a conventionally known one that holds the cable a to the body 1 by locking it to the locking portion 11 to be formed, and the cable a is tied so as to narrow down from the outer peripheral side of the cable a. The shape of the cable a is arbitrary as long as it is in a state of being integrally crimped to the outer peripheral surface of the cable a. Further, as shown in the example shown in FIG. 21, a band 53 formed in a flexible band shape by a synthetic resin material and formed in a rack shape with engaging teeth 52 on the inner peripheral surface thereof, and the band thereof. The band 53 is rolled into a loop by a mouth frame 55 having a ratchet claw 54 formed on one end side of the 53 integrally and continuously and engaging with the engaging teeth 52 ... of the band 53 on the inner peripheral surface. In some cases, a binding band is used in which the free end side is passed through the mouth frame 55 and the free end side is pulled out strongly to be bound by the looped band 53. However, in the caulking of the clamp c to the outer circumference of the cable a, the wedge-shaped body b described above is centered on the bundle of the core wires 30 ... from the end on the side where the core wires 30 ... of the cable a are exposed. In the state of being pushed into the part, the part corresponding to the outer circumference of the body of the wedge-shaped body b is bound. That is, the wedge-shaped body b pushed into the central portion of the bundle of the plurality of core wires 30 ... in the cable a is used as the core, and the outer peripheral surface of the wedge-shaped body b is coated with the inner skin 30a ... Tighten the bundle of .. and the outer skin 32 as they are pressed against each other. The cable a, which has been tied up by the clamp c with the wedge-shaped body b as the core, is in a state where the contact 20 ... connected to each terminal of the core wire 30 ... is held by the connector main body 2. A person who inserts and inserts into the cable outlet 10 which is formed separately on the upper half side 1a and the lower half side 1b of the body 1, and at that time, a clamp c which is tied up is formed around the cable outlet 10. By locking the stop portion 11 and in that state, the upper half side 1a and the lower half side 1b of the body 1 are closed and integrally connected, the connector A which is a light electric device is assembled, and the cable is also assembled. a is connected to its body 1 in a state of being integrally fixed. At this time, when the body 1 is molded of a metal material, a cover 6 which is molded of a synthetic resin material and fitted into the cable a in advance is attached to the outer surface of the body 1 assembled as described above. A cover 6 made of a synthetic resin material is molded to cover the outer periphery of the connection end of the assembled body 1 and the cable a. The embodiment device configured in this way operates as follows. When connecting the cable a to the body 1 which is the case of the light electric device, the core portion of the bundle of the core wires 30 ... which is exposed by cutting off the outer skin 32 of the cable a is shown in FIGS. The wedge-shaped body b, which is formed into an appropriate shape as shown above, is pushed in from the end of the cable a on the side where the bundle of the core wires 30 ... is exposed, and the wedge-shaped body b is covered with the outer skin 32. It is assumed that the core wire 30 ... is pierced into the axial center of the bundle. Next, from this state, the clamp c is wound around the outer circumference of the outer skin 32 of the cable a and the portion corresponding to the middle of the body body 40 of the wedge-shaped body b in the longitudinal direction, and the clamp c is wound around the outer peripheral surface of the cable a. Bondage and crimp. As a result, the cable a is bound by the clamp c from the outer peripheral side with the hard wedge-shaped body b pierced into the axial center portion as the core, so that each endothelium 30a ... The side of the outer peripheral surface of the cable a toward the axial center is crimped to the outer peripheral surface of the wedge-shaped body b, and the outer skin 32 that wraps the bundle of these core wires 30 ... is clamped by the clamp c that is tightened from the outer peripheral side. While crimping to the clamp c in a loose state, the inner peripheral side of the clamp c tightens each endothelium 30a ... of the above-mentioned core wire 30 ... to the outer peripheral surface of the wedge-shaped body b, and the outer skin 32 of the cable a. The endothelium 30a ..., which covers the core wire 30 ..., is further firmly attached to the clamp c on the outer peripheral side and the wedge-shaped body b located at the axial center portion. As a result, the binding portion of the cable a by the clamp c is fastened to the clamp c that tightens the outer peripheral side of the outer skin 32 and the wedge-shaped body b that is pierced into the axial center portion from the inside and outside in the diameter reduction direction. The clamp c, the exodermis 32, the inner diameter 30a ... covering each core wire 30 ..., and the wedge-shaped body b are integrally engaged to form an integral rigid body. Then, from this, the clamp c tightly bound to the outer circumference of the outer skin 32 is locked to the locking portion 11 provided around the cable outlet 10 of the body 1 of the light electric device, and the cable a is guided to the outside. When the cable a is connected to the body 1 which is the case of the light electric device, the cable a is made extremely strong against tension. That is, the portion of the cable a that is tightly bound to the clamp c becomes a rigid rod that is integrally connected to the clamp c and the wedge-shaped body b at the axial center portion, and is strongly engaged with the body 1. , When the cable a is strongly pulled, the shrinkage due to the elongation of the outer skin 32 and the inner skin 30a ... is hardly generated in the portion bound by the clamp c, so that the cable a becomes extremely strong in tension. .. According to the results of an actual tensile test on the shielded cable a that stores a bundle of four core wires 30 ..., as shown in Fig. 22, the wedge-shaped body b is not used and the shielded cable a is viewed from the outer peripheral side. When the clamp b was used for binding, the tensile holding force was in the range of 3 to 8 kg, whereas as shown in Fig. 23, the wedge-shaped body b was fitted with the screw-shaped one shown in Fig. 3. When used, it shows a tensile holding force of 20 kg or more, and as shown in Fig. 24, when a wedge-shaped body b shown in Fig. 12 is used. It shows a tensile holding force of 14Kg to 16Kg, and as shown in Fig. 25, when a wedge-shaped body b without a head 41 is used, it is 9Kg to 11Kg. The result shows the tensile holding force of.

[Effect of the invention] As described above, the cable retaining device in the light electric device according to the present invention is a wedge-shaped body located at the core portion of the bundle of the inner skin 300 and the core wire 30 ... that wraps the outer skin 32 and the core wire 30 of the cable a. b and the clamp c, which is wound around the outer circumference of the cable a and fastened, are integrally and tightly connected so as to form an integral rigid rod shape, and the binding portion of the rigid cable a is attached to the outer peripheral side of the portion. The cable a is attached to the body 1 by locking the clamp c and the locking portion 11 provided around the cable outlet 10 of the device 1 of the device, and the cable a is connected to the cable outlet 10 of the body 1. By pulling it out to the outside, a strong pulling force acts on the cable a, and even if the outer skin 32 and the endothelium 30a of the cable a are stretched and become thin, the thinning due to the stretch is caused by the cable. Since it does not reach the binding portion where a is bound by the clamp c, the connection of the cable a to the body 1 is ensured and the cable a is surely prevented from coming out. Moreover, the connection portion between the core wire 30 ... located inside the binding portion and the connection terminal in the body 1 is maintained in a perfect state.

[Simple explanation of drawings]

FIG. 1 is a perspective view during assembly of a connector capable of carrying out the means of the present invention, FIG. 2 is a vertical sectional view of the same cable, FIG. 3 is a side view of the wedge-shaped body of the same, and FIG. 4 is a wedge-shaped view of the same. Front view of the body, FIG. 5 is a side view of a wedge-shaped body of another embodiment, FIG. 6 is a front view of the same wedge-shaped body, FIG. 7 is a side view of a further different wedge-shaped body, FIG. FIG. 8 is a front view of the same wedge-shaped body, FIG. 9 is a front view of a modified example of the same wedge-shaped body, FIG. 10 is a side view of another wedge-shaped body embodiment, and FIG. Front view of the body, FIG. 12 is a side view of the wedge-shaped body of another embodiment, FIG. 13 is a side view of the wedge-shaped body of yet another embodiment, and FIG. 14 is a front view of the wedge-shaped body of the same as above. FIG. 15 is a side view of the wedge-shaped body of a further different embodiment, FIG. 16 is a front view of the wedge-shaped body of the same as above, FIG. 17 is a front view of a modified example of the wedge-shaped body of the same as above, and FIG. A front view of a further different variant of the body, FIG. 19 is a side view of yet another embodiment of the wedge-shaped body, FIG. 20 is a perspective view of the clamp, and FIG. 21 is a perspective view of the clamp in another form. FIG. 22 is an explanatory view of the conventional means subjected to the tensile test, and FIGS. 23, 24 and 25 are explanatory views of each embodiment of the present invention subjected to the tensile test. Description of drawing code A ...... light electrical equipment, a ...... cable, b ... wedge-shaped body c ...... Clamp, 1 ...... Body (case), 1a ...... Upper half side 1b ...... Lower half side, 10 ...... Exit, 11 ...... Locking part 2 ...... Connector body, 2a ...... Pole holding member, 2b ...... Outer housing 20 ...... contact, 30 ...... core wire, 30a ...... endothelium 31 ...... Shielded wire, 32 ...... Exodermis, 40 ...... Body main body 41 ...... head, 41a ...... fitting part, 42 ...... ridge 43 ...... protrusion, 44 ...... enlarged diameter part, 45 ...... reduced diameter part 46 ...... ridge, 47 ...... fitting groove, 48 ...... ridge 50 ...... Cleft part, 51 ...... Ridge, 52 ...... Engagement tooth 53 ...... band, 54 ...... ratchet claw, 55 ...... mouth frame 6 ...... Cover