JP2020068144A - Coaxial cable connector and coaxial cable - Google Patents

Abstract

To provide a coaxial cable connector including a contact having enhanced fixation force to a coaxial cable.SOLUTION: A contact of a coaxial cable connector according to an aspect of the invention comprises an internal conductor insertion part, a cylindrical member to be inserted, and a fastening member. The internal conductor insertion part has a plurality of plate-like pieces and a plurality of division grooves alternately arranged along the circumferential direction, the pieces and the grooves constituting a taper hole that has a diameter reducing toward one end side in an axial direction and has a plurality of stages having different tilt angles. The internal conductor insertion part is inserted into the inside of an internal conductor of a coaxial cable. The member to be inserted includes a through hole communicating with the one end side of the taper hole and includes a stopper part for a screw member inserted through the through hole and the taper hole. The fastening member includes a fitting part that fits with some of the plurality of division grooves and an engagement part in a cone shape that engages with the taper hole. The fastening member is drawn toward the taper hole's small diameter side by fastening the screw member abutting on the stopper part.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a coaxial cable connector attached to a coaxial cable having a hollow inner conductor and a coaxial cable having the same.

  A connector for a leaky coaxial cable having an antenna function in addition to a signal transmission function is composed of an external part having a shell and an external tightening fitting, and an internal part made of a contact, a bush, etc. 1).

  The contact of the internal part has, for example, a tip mounting portion for mounting the center pin and an internal conductor insertion portion including a plurality of plate-shaped pieces (flange portions) inserted inside the internal conductor of the leaky coaxial cable. . Inside the inner conductor insertion portion, a wedge-shaped tightening fitting having a protrusion (fitting portion) on the tip side is arranged. By moving the fastening metal fitting in the axial direction by bolting, a function of pushing and expanding the plurality of plate-shaped pieces from the inside is generated.

  In the conventional contact, for example, the inner surface of a plate-shaped piece divided into 6 parts is cut into a conical shape at the same angle as the inclined surface of the wedge-shaped tightening fitting, and the outer surface of the inner conductor insertion part formed of these 6 plate-shaped pieces is cut. The diameter is adjusted to the inner diameter of the inner conductor. The contact is fixed by a frictional force generated by pressing the outer peripheral surface of the plate-shaped piece against the inner peripheral surface of the inner conductor (for example, see Patent Document 2).

  Here, the inner conductor has spiral irregularities that occur during the manufacture of the leaky coaxial cable, and the convex portion on the inner surface of the inner conductor and the plate-like piece (the ridge portion) come into contact with each other, so that a flat contact state is not obtained. The contact area between the plate-shaped piece and the inner conductor is reduced.

  In addition, when the outer diameter of the inner conductor insertion portion composed of six plate-shaped pieces is smaller than the inner diameter of the inner conductor, a plurality of plate-shaped pieces are formed at an angle equal to or greater than the angle of the inclined surface (conical surface) of the conical fitting. The whole expands, and the plate-like piece obliquely contacts the inner surface of the inner conductor, which reduces the contact area. Further, with the six plate-shaped pieces, the contact width may not be sufficiently secured due to the difference in the curvature between the inner diameter of the inner conductor and the contact. Therefore, conventionally, it is necessary to prepare a plurality of contacts that match the inner diameter of the inner conductor. Further, since the angle of the tapered surface of the entire plurality of plate-shaped pieces is larger than the angle of the inclined surface (conical surface) of the tightening piece, the tip of the tightening piece scrapes the inner surface of the plate-like piece. The scraping of the inner surface of the plate-like piece causes a breakage of the plate-like piece in the long term.

  In addition, the anti-rotation function is obtained by sandwiching the protruding part of the tightening metal fitting in the dividing groove between the divided plate-like pieces, but when tightening the above-mentioned bolt, the force in the circumferential direction is increased. As a result, the side surface of the dividing groove with which the protrusion contacts increases and the plate-shaped piece is biased. Furthermore, depending on the state of such plate-like pieces provided in the contact, the bolt does not rotate when tightening the bolt, and the entire contact rotates, causing twisting force on the inner conductor, damage to the contact mounting surface, and tightening. Insufficient torque will occur.

JP, 10-172678, A Japanese Utility Model Publication No. 3-32382

  As described above, since the inner conductor has spiral irregularities (dimples on the outer peripheral surface of the inner conductor that occur when a cordel string is wound) that occurs during cable manufacturing, the inner conductor insertion and attachment that consists of multiple plate-shaped pieces The outer peripheral surface of the portion comes into contact with the cordel mark (projection) on the inner peripheral surface of the inner conductor, and the contact area of the plate-shaped piece is reduced. For this reason, the fixing force between the contact and the inner conductor is weak, and the contact may be displaced from the fixing position with the inner conductor, and the electrical characteristics may be deteriorated or the contact may fall off from the inner conductor. Further, as the above bolts are tightened, the force in the circumferential direction increases, causing damage to the side surface of the dividing groove with which the protrusion contacts and deviation of the plate-like piece, which causes contact between the internal conductor and the plate-like piece. The contact is not uniform, and the contact may be displaced from the position where it is fixed to the inner conductor, and the electrical characteristics may be deteriorated, or the contact may fall off from the inner conductor.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a coaxial cable connector capable of increasing the fixing force of a contact to a coaxial cable and a coaxial cable including the same.

  To achieve the above object, the coaxial cable connector according to one aspect of the present invention is attached to a coaxial cable having a hollow inner conductor. The contact of this coaxial cable connector includes an internal conductor insertion portion, a tubular inserted member, and a tightening member. On the inner peripheral side of the inner conductor insertion portion, a plurality of plate-shaped pieces and a plurality of divided grooves that form a plurality of tapered holes having different inclination angles and have a reduced diameter toward the one end side in the axial direction are formed in the circumferential direction. Are alternately arranged along the inner conductor and are inserted inside the inner conductor. The inserted member has a through hole that communicates with the one end side of the tapered hole, and also has a stopper portion of a screw member through which the through hole and the tapered hole are inserted. The tightening member includes a fitting portion that fits into some of the plurality of dividing grooves, and a cone-shaped engaging portion that engages with the tapered hole, and the screw member that abuts the stopper portion. By tightening, the taper hole is pulled toward the smaller diameter side.

  The plurality of divided grooves include a first divided groove into which the fitting portion is fitted and a second divided groove which is a non-fitting target of the fitting portion, and in the second divided groove. It is also possible to apply a configuration in which the circumferential width is narrower than the circumferential width of the first dividing groove. The inclination angle of the taper hole having the largest inclination angle among the plurality of tapered holes is the same as the inclination angle of the cone-shaped engaging portion of the tightening member. Further, the plurality of stages of tapered holes may be constituted by, for example, two or more stages, or may be constituted by curved surfaces having different inclinations, and the total number of the plurality of division grooves is, for example, eight. is there.

  On the other hand, on the fitting end side of the fitting portion, a guide portion for guiding fitting into the split groove is formed. Further, the tightening member is formed in the shaft center of the engaging portion, is formed in the screw hole that is screwed into the screw member, and the shaft center of the fitting portion, and communicates with the one end side of the screw hole. And a second through hole through which the screw member is inserted. Further, the inserted member has a flange portion, and a part of the outer peripheral surface of the flange portion is formed as a flat surface. In addition, the plurality of plate-shaped pieces include a first plate-shaped piece that is adjacent to the first division groove and a second plate-shaped piece that is not adjacent to the first division groove. The circumferential width of the first plate-shaped piece may be narrower than the circumferential width of the second plate-shaped piece. Further, it is possible to obtain a coaxial cable to which such a coaxial cable connector is attached.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the connector for coaxial cables which can raise the fixing force of the contact with respect to a coaxial cable, and the coaxial cable provided with this.

The figure which shows the structure of the coaxial cable in which the connector for coaxial cables which concerns on embodiment of this invention is attached. Sectional drawing of the coaxial cable shown in FIG. The figure which shows the connector for coaxial cables attached to the coaxial cable of FIG. 1 by a partial cross section. The figure which shows a contact which is an internal component of the connector for coaxial cables of FIG. 3 by a partial cross section. The arrow view A of the contact shown in FIG. The figure which shows the contact of the connector for coaxial cables of a comparative example by a partial cross section. The arrow view B of the contact shown in FIG. FIG. 6 is a development view showing the inner peripheral surface of the inner conductor when the contact is attached in the embodiment for explaining the contact portion between the inner conductor of the coaxial cable shown in FIG. 1 and the contact shown in FIGS. 4 and 5. FIG. 8 is a development view showing the inner peripheral surface of the inner conductor of the comparative example, which is developed when the contact is attached, for explaining contact points between the inner conductor of the coaxial cable shown in FIG. 1 and the contacts shown in FIGS. 6 and 7. The figure which shows the result of having compared Example 1 and the comparative example 1 about the pulling-out force which pulls out the contact of FIG. 8, FIG. 9 from an internal conductor. The figure which shows the result of having compared Example 2 and the comparative example 2 about the pulling-out force which pulls out the contact of FIG. 8, FIG. 9 from an internal conductor.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the coaxial cable 10 to which the coaxial cable connector according to the present embodiment is attached is designed to transmit a signal and also be used as an antenna by leaking a radio wave. It is a so-called leaky coaxial cable. In this coaxial cable 10, an elongated slot (hole) 15 a is formed in the outer conductor 15. As a result, the coaxial cable 10 can transmit or receive radio waves.

  As shown in FIGS. 1 and 2, the coaxial cable 10 includes an insulating pipe 11 as an inner sheath, a sheath 17 as an outer sheath, a pipe-shaped inner conductor 12, a cordel string 14, the outer conductor 15 described above, and a supporting ridge. It has a part 18 and a support line 19. The inner conductor 12 is made of, for example, a hollow pipe made of copper or aluminum. The cordel string 14 is a spacer spirally wound around the outer surface of the inner conductor 12.

  The insulating pipe 11 is a tubular body having an electrical insulating property, and is provided at a constant interval in the radial direction from the internal conductor 12 via the cordel string 14. The outer conductor 15 is a metal tape wound around the outer peripheral surface of the insulating pipe 11 in a bellows shape. The sheath 17 covers the outer conductor 15 and the outside of the support wire 19. The supporting ridge 18 is a supporting portion of the coaxial cable main body that extends along the axial direction of the coaxial cable 10 and projects in the radial direction. The support wire 19 is a messenger wire made of a stranded wire, and is provided as an inner core of the supporting ridge 18.

  As shown in FIG. 3, the coaxial cable connector 20 is attached to the end of the above-described coaxial cable 10. The coaxial cable connector 20 is composed of an external part having a shell 20a and a shell tightening tool 20b, and an internal part having a contact 30 and bushes 23a, 23b, 23c and an insulator 26 which will be described later. The shell tightening tool 20b and the bushes 23a and 23b are fitted to the outer peripheral portion of the end portion of the coaxial cable 10.

  Further, the bush 23c and the insulator 26 fitted in the bush 23c are fixed by screwing and tightening with the shell 20a on the outer peripheral surface of the shell tightening tool 20b.

  As shown in FIGS. 4 and 5, in addition to FIG. 3 described above, the contact 30 included in the coaxial cable connector 20 includes a contact body 31, a bolt 33 as a screw member, and a tightening fitting 32 that is a tightening member. . The tightening fitting 32 fixes the contact body 31 inserted into the center hole (inside) of the inner conductor 12 via a bolt 33. The contact body 31 has a concave portion 34 formed in the central portion in the longitudinal direction along the circumferential direction, and has an inner conductor insertion portion 35 and a tubular insertion member 36 which are divided by the concave portion 34. There is.

  The inner conductor insertion portion 35 has a plurality of first and second plates that form a plurality of stages of tapered holes 49 that have a reduced diameter toward one end side (tip side) in the axial direction of the contact body 31 and have different inclination angles. The strips (stripes) 38, 48 and the plurality of first and second dividing grooves 37, 47 are alternately arranged along the circumferential direction. As shown in FIG. 3, the inner conductor insertion portion 35 is attached to the inner side (inner peripheral surface) of the inner conductor 12 of the coaxial cable 10.

  On the other hand, the inserted member 36 has a through hole (first through hole) 46 communicating with the one end side of the tapered hole 49 of the internal conductor insertion portion 35, and the through hole 46 and the tapered hole 49 are inserted therethrough. A stopper portion (step portion) 41 of the bolt 33 is provided. The bolt 33 has a head portion 44 having a hexagonal hole 44a and a washer 33a. The head portion 44 abuts (engages) with the stopper portion 41 when the bolt 33 is tightened.

  The tightening fitting 32 has a square columnar fitting portion (projection portion) 43 that fits with some of the plurality of dividing grooves (fits with the first dividing groove 37), and a taper hole 49 of the internal conductor insertion portion 35. And a cone-shaped (cone-shaped) engaging portion 45 to be engaged. The tightening fitting 32 is pulled toward the smaller diameter side (the one end side) of the tapered hole 49 of the inner conductor insertion portion 35 by tightening the bolt 33 with which the head portion 44 contacts the stopper portion 41. Specifically, the fastening fitting 32 has a screw hole 45a and a through hole (second through hole) 43b. The screw hole 45a is formed in the axial center of the engaging portion 45. On the other hand, the through hole 43b is formed at the axial center of the fitting portion 43. The through hole 43b communicates with one end of the screw hole 45a and allows the bolt 33 (the male screw portion of the bolt 33) to be inserted therethrough.

  Here, as described above, the through hole 43b (insertion hole) for simply inserting (through) the bolt 33 is formed in the shaft center of the fitting portion 43 without intentionally forming a screw hole. . Such a through hole 43b functions as a guide hole for guiding the tip of the bolt 33 to the screw hole 45a of the shaft center of the engaging portion 45. As a result, it is possible to avoid a problem that the tip of the bolt 33 and the screw hole 45a are screwed together, for example, in a tilted state to crush each other's threads.

  Here, as shown in FIGS. 4 and 5, the inserted member 36 has a flange portion 39. Further, a part of the outer peripheral surface of the flange portion 39 is formed with a tool gripping surface (flat surface) 39a that can be gripped with a spanner, an adjustable wrench, or the like in order to prevent the contact 30 from idling by tightening and removing. The tool gripping surface 39a is formed of a pair of flat surfaces facing a part of the outer peripheral surface of the flange portion 39. As a result, it is possible to avoid the problem that the bolt does not rotate when the bolt is tightened and the entire contact rotates, resulting in a twisting force on the internal conductor, damage to the contact mounting surface, and insufficient tightening torque. That is, the tool gripping surface 39a functions as a rotation stopping mechanism in the circumferential direction of the contact body 31. With this configuration, the contact body 31 can be tightened and fixed with a desired torque, so that the fixing force for the inner conductor can be stabilized.

  As shown in FIGS. 4 and 5, the above-described first dividing groove 37 of the internal conductor insertion portion 35 is provided at two places, and the fitting portion 43 of the fastening fitting 32 is fitted therein. On the other hand, the second dividing groove 47 is provided at six places and is a non-fitting target groove that is not fitted to the fitting portion 43. The total number of the above-mentioned first dividing groove 37 and the second dividing groove 47 is eight. Here, the width of the second dividing groove 47 is formed narrower than the width of the first dividing groove 37. The width A7 of the first dividing groove 37 is the distance between the first plate-like pieces 38, 38, which is shorter than the interval (arc length) a7 between the adjacent plate-like pieces, which will be described later. The width A1 of 47 is the distance between the second plate-shaped pieces 48, 48, and is shorter than the interval (arc length) a1 between adjacent plate-shaped pieces described later.

  Here, a guide portion 43a for guiding the fitting into the first dividing groove 37 is formed on the fitting end side (the one end side) of the fitting portion 43 of the fastening fitting 32 with the first dividing groove 37. Has been done. The guide portion 43a is formed by subjecting an edge portion (corner portion) on the fitting end side of the square columnar fitting portion 43 to chamfering such as R surface processing and C surface processing. As a result, friction when fitting the fitting portion 43 into the first dividing groove 37 is reduced, and damage between fitting portions can be suppressed.

  On the other hand, the above-mentioned first plate-shaped pieces 38 of the inner conductor insertion portion 35 are arranged at positions (four positions) adjacent to the first dividing grooves 37, respectively. On the other hand, the second plate-shaped piece 48 is arranged at a non-adjacent position (four positions) that is not adjacent to the first dividing groove 37. The circumferential width (for example, maximum width) of the first plate-shaped piece 38 is formed to be narrower than the circumferential width (for example, maximum width) of the second plate-shaped piece 48.

  The configuration of the inner conductor insertion portion 35 described above is applied to increase the fixing force of the contact 30 with respect to the coaxial cable 10 (the fixing force between the inner peripheral surface of the inner conductor 12 and the outer peripheral surface of the inner conductor insertion portion 35). ing. That is, when the number of divisions of the inner conductor insertion portion is, for example, 6, the width of the plate-shaped piece (the bead portion) in the circumferential direction is too large, and the contact width with the inner peripheral surface of the inner conductor 12 is limited. However, the contact width between the inner peripheral surface of the inner conductor 12 and the eight plate-shaped pieces is ensured by setting the number of divisions of the inner conductor insertion portion to eight, for example (8 plate-shaped pieces). The contact area between the inner conductor insertion portion 35 and the inner conductor 12 is increased, and the fixing force of the contact 30 to the coaxial cable 10 is improved. Here, if the number of divisions of the internal conductor insertion portion is increased, the number of division grooves between the divided plate pieces also increases, and the contact width in the circumferential direction between the internal conductor and the plate pieces decreases. Therefore, by making the width of the second division groove 47 smaller than the width of the first division groove 37, the reduction of the contact area between the internal conductor and the plate-shaped piece is suppressed.

  Further, as shown in FIGS. 4 and 5, the plurality of stages of tapered holes 49 in the internal conductor insertion portion 35 are formed in two stages, for example. Such a plurality of stages of tapered holes may be constituted by three or more stages, or may be constituted by curved surfaces having different inclinations. Due to the processing of the tapered hole, it is preferable that the tapered hole has two stages. In addition, the inclination angle of the taper hole having the largest inclination angle among the plurality of tapered holes is the same as the inclination angle of the cone-shaped engaging portion 45 formed in, for example, a truncated cone shape in the fastening fitting 32. Is. With the same angle, when the contact 30 is attached to the inner conductor 12 and the outer peripheral surface of the inner conductor insertion portion 35 is pressed against the inner peripheral surface of the inner conductor 12 by the tightening metal fitting (tightening member) 32, the inclined surface 38a. The engaging portion 45 comes into close contact with each other, and the contact angle in the axial direction between the outer peripheral surface of the inner conductor inserting portion 35 and the inner peripheral surface of the inner conductor 12 is reduced, and the contact length can be increased. This increases the fixing force between the inner peripheral surface of the inner conductor 12 and the outer peripheral surface of the inner conductor insertion portion 35. Here, in the longitudinal section obtained by cutting the contact body 31 in the axial direction, the angle formed by the axis line and the inclined surface 38a (and the inclined surface 48a) on the side far from the opening end of the tapered hole 49 is, for example, 3 °. Is. On the other hand, in the longitudinal section obtained by cutting the contact body 31 in the axial direction, the angle formed by the axis line and the inclined surface 38b (and the inclined surface 48b) on the side closer to the opening end of the tapered hole 49 is, for example, 10 °. is there. The inclination angle of the tapered hole having the largest inclination angle among the plurality of stages of tapered holes (two-stage tapered holes 49) is the same as the inclination angle of the cone-shaped engaging portion 45 of the fastening fitting 32. is there. In the example of FIG. 4, the inclination angle of the engaging portion 45 and the maximum inclination angle (inclination angles of the inclined surfaces 38b and 48b) in the plurality of tapered holes are, for example, 10 °.

  As described above, by applying the plurality of stages of tapered holes 49 having different inclination angles to the internal conductor insertion portion 35, when the tightening fitting 32 is tightened, a plurality of tapered holes 49 having a cone-shaped engaging portion 45 or more are provided. The taper hole 49 of the step is expanded, and the tip of the engaging portion 45 of the fastening member 32 is suppressed from coming into contact with the inner surface of the plate-shaped piece. Therefore, friction at the time of engaging the engagement portion 45 of the tightening fitting 32 with the tapered hole 49 of the inner conductor insertion portion 35 is reduced, and damage between the engagement portions can be suppressed. Accordingly, when the bolt 33 is tightened with a predetermined tightening torque, the force for expanding the tapered hole 49 (plate-shaped piece) can be increased, so that the inner conductor insertion portion 35 is fixed to the inner conductor 12 of the coaxial cable 10. You can improve your strength.

  As described above, the coaxial cable connector 20 according to the present embodiment can increase the fixing force of the contact 30 with respect to the coaxial cable 10.

  Next, an embodiment of the present invention will be described based on FIGS. 6 to 11 in addition to FIGS. 3 to 5 described above. Here, FIG. 6 is a partial cross-sectional view of the contact 50 of the coaxial cable connector of the comparative example, and FIG. 7 is a view B of the contact 50 shown in FIG. Further, FIG. 8 is an inner circumference of the inner conductor 12 at the time of attaching the contacts of Examples 1 and 2 for explaining a contact portion between the inner conductor of the coaxial cable shown in FIG. 1 and the contact 30 shown in FIGS. 4 and 5. It is a development view which expands and shows a field.

  On the other hand, FIG. 9 is a developed view showing the outer peripheral surfaces of the contacts of Comparative Examples 1 and 2 for explaining the contact location between the inner conductor of the coaxial cable shown in FIG. 1 and the contact 50 shown in FIGS. 6 and 7. It is a figure. In addition, FIG. 10 is a diagram showing the results of comparing Example 1 and Comparative Example 1 with respect to the pulling force for pulling out the contacts of FIGS. 8 and 9 from the internal conductor. Further, FIG. 11 is a diagram showing the results of comparing Example 2 and Comparative Example 2 with respect to the pulling force for pulling out the contacts of FIGS. 8 and 9 from the internal conductor.

  As shown in FIGS. 6 and 7, the contact 50 of the coaxial cable connector of the comparative example includes a contact body 51, an inner conductor insertion portion 55 having a one-step tapered hole 59, and an inclined surface (tapered surface) 58a. Six plate-like pieces 58 that have the same width (maximum width, etc.) in the circumferential direction, and six dividing grooves 57 that have the same groove width in the circumferential direction, and the fitting portion 53. It mainly includes a fitting 56 and a tightening fitting 52 having a screw hole 52a.

  As shown in FIGS. 8 and 9, more specifically, the main characteristic values of the inner conductor mounting portion in Example 1 and Comparative Example 1 and in Example 2 and Comparative Example 2 are compared as follows. First, a1 and a7 are intervals (arc length) between adjacent plate-like pieces, a2 and a8 are arc lengths of the plate-like pieces, a3 is a contact length between the plate-like pieces and the inner conductor, and a4 is a convex portion on the inner surface of the inner conductor. Area, a5 is a contact area between the inner conductor and the plate-shaped piece, and a6 is an inner diameter of the inner conductor. Further, b1 is a space between adjacent plate-like pieces, b2 is an arc length of the plate-like pieces, b3 is a contact length between the plate-like pieces and the inner conductor, b4 is a region of a convex portion on the inner surface of the inner conductor, and b5 is an inner conductor. The contact area of the plate-like piece, b6 is the inner diameter of the inner conductor.

  Furthermore, in Example 1 and Comparative Example 1, a copper inner conductor was applied to the coaxial cable on the mounted side. Further, the sum of the arc lengths a2, a8, and b2 of the plate-like piece is 0.98 times in the case of Comparative Example 1 being 1, and the sum of the contact lengths a3 and b3 of the inner conductor and the plate-like piece is. When Comparative Example 1 is set to 1, Example 1 is 1.03 times.

  On the other hand, in Example 2 and Comparative Example 2, an aluminum inner conductor was applied to the coaxial cable on the mounted side. Further, the sum of the arc lengths a2, a8, and b2 of the plate-like piece is 1.06 times when the comparative example 2 is 1, and the sum of the contact lengths a3 and b3 of the internal conductor and the plate-like piece is. When Comparative Example 2 is set to 1, Example 2 is 1.33 times as large.

  As a result of observing the contact traces of the inner conductors of Example 1 and Comparative Example 1 as described above, the total sum of the contact regions a5 and b5 of the inner conductor and the plate-like piece and the convex regions a4 and b4 of the inner surface of the inner conductor is Comparative Example 1. The contact trace of 1.22 times as large as that of Example 1 was confirmed.

  Furthermore, as a result of observing the contact traces of the inner conductors of Example 2 and Comparative Example 2, the sum of the contact regions a5 and b5 of the inner conductor and the plate-shaped piece and the convex regions a4 and b4 of the inner surface of the inner conductor is the same as that of Comparative Example 2. A 1.4 times larger contact trace was confirmed in Example 2.

  Further, as is clear from the results shown in FIGS. 10 and 11, Examples 1 and 2 provided with the internal conductor insertion portion having a plurality of tapered holes have the internal conductor insertion portion having a single tapered hole. It was verified that the pulling-out force was improved by about 1.3 to about 2 times as compared with the provided Comparative Examples 1 and 2, and the fixing force of the contact to the coaxial cable was increased.

  Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are also included in the invention described in the claims and the scope equivalent thereto.

10 Coaxial Cable 11 Insulated Pipe 12 Inner Conductor 14 Cordell String 15 Outer Conductor 15a Slot 17 Sheath 18 Supporting Protrusion 19 Support Line 20 Coaxial Cable Connector 20a Shell 20b Shell Tightening Tool 23a Bush 23b Bush 23c Bush 26 Insulator 30 Contact 31 Contact body 32 Tightening fitting (tightening member)
33 Bolt 33a Washer 34 Recessed portion 35 Inner conductor insertion portion 36 Inserted member 37 First dividing groove 38 First plate-shaped piece 38a Sloping surface 38b Sloping surface 39 Flange portion 39a Tool gripping surface (flat surface)
41 stopper part 43 fitting part 43a guide part 43b through hole (second through hole)
44 Head 44a Hexagonal hole 45 Engaging part 45a Screw hole 46 Through hole (first through hole)
47 Second split groove 48 Second plate-shaped piece 48a Sloping surface 48b Sloping surface 49 Tapered hole 50 Contact 51 Contact body 52 Tightening fitting 52a Screw hole 53 Fitting portion 55 Internal conductor inserting portion 56 Engaging portion 57 Dividing groove 58 plate-like piece 58a inclined surface 59 taper hole 60 flange

Claims (10)

A coaxial cable connector attached to a coaxial cable having a hollow inner conductor,
A plurality of plate-like pieces and a plurality of dividing grooves that form a plurality of tapered holes having different inclination angles and that have a reduced diameter toward one end side in the axial direction are arranged alternately along the circumferential direction, and An inner conductor insertion part that is inserted inside,
A tubular inserted member having a through hole communicating with the one end side of the tapered hole and having a stopper portion of a screw member inserted through the through hole and the tapered hole,
The screw member has a fitting portion that fits with some of the plurality of dividing grooves, and a cone-shaped engaging portion that engages with the tapered hole, and is tightened by tightening the screw member that abuts the stopper portion. A tightening member that is drawn to the smaller diameter side of the tapered hole,
For coaxial cable having a contact provided with. The plurality of dividing grooves include a first dividing groove into which the fitting portion is fitted and a second dividing groove that is a non-fitting target of the fitting portion. The width is narrower than the width of the first dividing groove,
The coaxial cable connector according to claim 1. Of the plurality of tapered holes, the inclination angle of the taper hole having the largest inclination angle is the same as the inclination angle of the cone-shaped engaging portion of the tightening member.
The coaxial cable connector according to claim 1 or 2. The plurality of stages of tapered holes are configured in two stages,
The coaxial cable connector according to any one of claims 1 to 3. The total number of the plurality of division grooves is eight,
The coaxial cable connector according to any one of claims 1 to 4. On the fitting end side of the fitting portion, a chamfered guide portion for guiding fitting into the split groove is formed.
The coaxial cable connector according to any one of claims 1 to 5. The tightening member is formed in the shaft center of the engaging portion, and a screw hole screwed with the screw member,
A second through hole that is formed in the axial center of the fitting portion, communicates with the one end side of the screw hole, and allows the screw member to be inserted therethrough;
The coaxial cable connector according to any one of claims 1 to 6. The inserted member has a flange portion, a part of the outer peripheral surface of the flange portion is formed of a pair of flat surfaces facing each other,
The coaxial cable connector according to any one of claims 1 to 7. The plurality of plate-shaped pieces have a first plate-shaped piece that is adjacent to the first division groove and a second plate-shaped piece that is not adjacent to the first division groove, and The circumferential width of the first plate-shaped piece is narrower than the circumferential width of the second plate-shaped piece,
The coaxial cable connector according to any one of claims 2 to 8.   A coaxial cable to which the connector for a coaxial cable according to claim 1 is attached.

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