JP5399311B2 - Coaxial cable clamping device - Google Patents

Description

  The present invention relates to a clamp device for connecting a terminal end of a coaxial cable, and more particularly to a device that reduces signal leakage.

  A coaxial cable used for wiring of a TV hearing facility or the like has suppressed signal leakage, and is used to construct a signal network with high confidentiality.

  In order to configure a network, it is necessary to connect the coaxial cable to an electronic device to be connected or another coaxial cable, and a connector is used for this purpose. The connector is provided with a clamp device that securely holds the coaxial cable, and mechanically and electrically connects the coaxial cable to the connection target.

JP 2007-48466 A

  Conventionally, a coaxial cable clamping device used in a signal distributor or the like used at home for TV reception has a function of mechanically holding and electrically connecting the coaxial cable. There are some aspects that do not give strict consideration to signal leakage, such as the part being exposed to the outside.

  However, with the progress of digitization of TV signals, there is a need to more strictly suppress signal leakage that has not been a problem in the past. In other words, it is not sufficient to simply connect mechanically and electrically, and it is necessary to maintain isolation so that signals transmitted through the coaxial cable do not leak to the outside or enter the coaxial cable from the outside. There is.

  The present invention has been made in consideration of the above points, and an object of the present invention is to provide a coaxial cable clamping device having signal leakage characteristics superior to that of a coaxial connector.

In order to achieve the above object, in the present invention,
A cylindrical connection part into which the coaxial cable with the core wire exposed is inserted;
A clamp screw having a thread groove on the outer periphery and a tool insertion hole on the inner periphery, and a clamp piece that is formed at its end to abut against the outer periphery of the coaxial cable and is rotatably supported by the clamp screw A cable clamp,
The clamp piece is provided in a right-angle direction on the side of the connection portion, and is formed in a cylindrical shape having a screw groove that engages with the screw groove of the cable clamp on the inner periphery, and the clamp piece is disposed at a portion closest to the connection portion. A guide hole that guides while maintaining a predetermined orientation, and a clamp portion to which the cable clamp is mounted;
Coaxial cable clamping device with
I will provide a.

  As described above, the present invention grips the coaxial cable inserted from the connection portion by attaching the cable clamp to the clamp portion, so that the coaxial cable core wire is not exposed to the outside and the signal leakage is extremely small. A cable clamping device can be provided.

The perspective view which shows the external appearance of one Example of this invention. FIG. 2 is a partial cross-sectional view showing a part of the embodiment shown in FIG. The fragmentary sectional view which shows the structure of the cable clamp used for the Example shown in FIG. FIGS. 4A to 4D are a front sectional view, a both end view, and a side view of the cable clamp shown in FIG. The fragmentary sectional view which shows the internal structure of the signal divider | distributor using the said Example. The fragmentary sectional view which shows the structure of the other Example which raised the cable gripping force of the said Example. The fragmentary sectional view which shows the structure of the further another Example which raised the cable gripping force of the said Example. The perspective view which shows the external appearance of the other Example comprised so that fastening of a cable clamp might be performed without using a tool. The fragmentary sectional view which shows the example which used this invention for the relay connector for connection of coaxial cables. Explanatory drawing which shows the example which incorporated this invention in the coaxial connector.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows the appearance of an embodiment of the present invention. This embodiment shows an example in which the present invention is applied to a housing 100 of a signal distributor that distributes an input signal into two.

  In this signal distributor, a signal is given from a coaxial cable connected to the input terminal on the right side of the figure and supplied to the coaxial cable connected to the two output terminals on the left side. There is one. In these connection portions 110, a clamp portion 120 is provided on the upper surface of the connection portion 110 protruding in a cylindrical shape in the left-right direction in the figure.

  In the clamp unit 120, for example, a hexagonal wrench (not shown) is inserted and tightened to press and hold the end of the coaxial cable 200 inserted into the connection unit 110. Thereby, the coaxial cable 200 is firmly fixed to the housing 100. In FIG. 1, a thin coaxial cable 200A is inserted into the front output terminal of the two output terminals, and a gap is generated between the outer periphery of the coaxial cable 200 and the inner periphery of the connection portion 110. A metal or resin collar 210 is inserted so as not to be present.

  FIG. 2 illustrates the internal structure of the connecting portion 110 and the clamp portion 120 incorporated in the connecting portion 110 as a cross section. The connection part 110 has a cylindrical space so as to accommodate the centered tip of the coaxial cable 200, and a clamp part 120 that is continuous in the upward direction in the figure is provided in the middle.

  The clamp part 120 is gripped by pressing the side part of the coaxial cable 200 inserted into the connection part 110, and includes a cylindrical clamp cylinder part 121, a guide hole 122 communicating with the clamp cylinder part 121, and a clamp. The cable clamp 123 is inserted into the cylindrical portion 121 and the guide hole 122.

  The cable clamp 123 includes a clamp screw 123a and a clamp piece 123b that is rotatably supported by the clamp screw 123a. The cable clamp 123 is inserted into the clamp cylinder 121 and the guide hole 122, and the tip of the clamp piece 123b. Then, the coaxial cable 200 is pressed and fixed.

  The clamp cylinder 121 has a thread groove on the inner peripheral surface, and is used for screwing the clamp screw 123a using, for example, a hexagonal wrench as shown. At the time of this screwing, the guide hole 122 has a long cross-sectional shape, and is guided downward in the figure so that the clamp piece 123b does not rotate, and when tightened, the upper end surface part of the guide hole 122 in the figure with respect to the clamp piece 123b Functions as a stopper. This prevents an excessive pressing force from being applied to the coaxial cable 200.

  In addition, the screw provided in the outer periphery of the thread groove of the clamp cylinder part 121 and the clamp screw 123a here is a member name which represents another lock mechanism, for example, a half-rotation lock mechanism.

  FIG. 3 shows the detailed structure of the clamp screw 123a and the clamp piece 123b. The clamp screw 123a has a substantially cylindrical shape, a thread groove is cut on the outer periphery, and a hole for a hexagon wrench, for example, is formed on the inner peripheral surface. And one end is a slot for a hexagon wrench, and the other end is shaped to be crimped so as to fix the crimped portion 123b1 of the clamp piece 123b.

  On the other hand, the clamp piece 123b is rotatably caulked and fixed to the other end of the clamp screw at one end, and applies a pressing force to the coaxial cable 200 (FIGS. 1 and 2) at the other end. In addition, the clamp piece 123b may be fixed by screwing, riveting, or the like.

  In order to give this pressing force, the other end of the clamp piece 123b is formed as two teeth 123b2 so as to bite into contact with the outer periphery of the coaxial cable to some extent. Since the coaxial cable has a circular cross section, the tooth profile is formed to have a substantially arc shape so as to be aligned with the outer periphery of the coaxial cable in the cross section, and the tooth tip is formed in a mountain shape whose ridge line extends in the arc direction.

  In addition, the clamp piece 123b has an elongated transverse cross section of the two teeth 123b2, and this part is guided by the guide hole 122 of the clamp portion 120. Therefore, the clamp piece 123b does not rotate and enters and exits the guide hole 122. To do.

  4A to 4D show the structures of the cable clamp 123, that is, the clamp screw 123a and the clamp piece 123b, as a front sectional view, a both end view, and a side view.

  4 (a) shows the caulking structure of the clamp screw 123a and the clamp piece 123b, FIG. 4 (b) shows the shape of the hexagon wrench insertion portion and the rotatable caulking structure, and FIG. 4 (c) shows the clamping piece. Fig. 4 (d) shows the shape of the tooth 123b2 of the clamp piece 123b that is sharp enough to bite into the coaxial cable and bite into the braid of the coaxial cable. It can be used for earth connection.

  FIG. 5 is a partial cross-sectional view showing the internal structure of the connecting portion 110. The connection part 110 is configured as a coaxial connector, and is mechanically fixed by providing a detent 123c so that the coaxial cable 200 does not rotate inside the connection part 110. Then, the core wire 201 of the coaxial cable 200 is used as a central conductor and guided to the core wire receiving pin 125 via the core wire guide 124. In order to confirm that the core wire 201 is in contact with the core wire receiving pin 125, a viewing window 130 is opened in the housing of the signal distributor 100. Further, when the braid 202 folded back on the insulation coating of the coaxial cable 200 is used as the outer conductor, the coaxial cable may be pressed in the radial direction so that the rotation stopper 123c is bitten into the braid.

  FIG. 6 shows an example of a structure that reinforces the coaxial cable gripping force of the connecting portion 110. This is because a concave portion (or hole) 111 is provided on the connecting portion 110 on the opposite side of the clamp portion 120 in the radial direction, and the teeth 123b2 of the clamp piece 123b push the coaxial cable 200 into the concave portion 111 to deform it, thereby strengthening the gripping force. It is a thing.

  FIG. 7 shows another structural example that reinforces the coaxial cable gripping force of the connecting portion 110. In this configuration, two clamp portions 120 are provided on the connection portion 110, and the clamp portions 120 are provided on both sides of the connection portion 110 in the radial direction. As a result, the end of the clamp piece 123b is pressed from both radial sides of the coaxial cable 200 to grip the coaxial cable 200.

  FIG. 8 shows a structural example for connecting the coaxial cable 200 without a tool. In the above embodiment, the tightening operation of the cable clamp 123 is performed using a tool such as a hexagonal wrench as a representative example, but in this embodiment 4, a knob 126 is provided and an operator manually tightens it. You can do the work.

  FIG. 9 shows a structural example in which the present invention is applied to a relay connector for connecting coaxial cables 200 to each other. This relay connector 100A is obtained by connecting two connecting portions 110 in the axial direction. Core wire receiving pins 125 connect the core wires 201 of the two coaxial cables, and press and fix the coaxial cable 200 at the tip of the clamp piece 123b.

  FIG. 10 shows a structural example in which the present invention is applied to an F-type coaxial connector. In this case, the coaxial cable 200 is pressed and fixed at the tip of the clamp piece 123b, and the core wire 201 of the coaxial cable 200 is used as it is as the central conductor of the connector. That is, when the operation of connecting the coaxial cable 200 to the connector 100B is completed, the coaxial connector is completed.

100 housing, 100A relay connector, 100B connector,
110 connection part, 120 clamp part, 121 clamp cylinder part,
122 guide hole, 123 cable clamp, 123a clamp screw,
123b clamp piece, 123b1 caulking portion, 123b2 teeth,
123c Non-rotating, 124 core wire guide, 125 core wire receiving pin,
130 viewing window, 200, 200A coaxial cable, 201 center conductor,
202 braids, 210 colors, 300 tools.

Claims (4)

A cylindrical connection part into which the coaxial cable with the core wire exposed is inserted;
A clamp screw having a thread groove on the outer periphery and a tool insertion hole on the inner periphery, and a clamp piece that is formed at its end to abut against the outer periphery of the coaxial cable and is rotatably supported by the clamp screw A cable clamp,
The clamp piece is provided in a right-angle direction on the side of the connection portion, and is formed in a cylindrical shape having a screw groove that engages with the screw groove of the cable clamp on the inner periphery, and the clamp piece is disposed at a portion closest to the connection portion. A guide hole that guides while maintaining a predetermined orientation, and a clamp portion to which the cable clamp is mounted;
A coaxial cable clamping device. In the clamping device of the coaxial cable according to claim 1,
A coaxial cable clamping device in which a stopper for restricting excessive tightening of the cable clamp is provided around the guide hole. In the clamping device of the coaxial cable according to claim 1,
The cable clamp is a coaxial cable clamping device having an arc-shaped portion in which the tooth profile abuts on an outer periphery of the coaxial cable. In the clamping device of the coaxial cable according to claim 1,
A coaxial cable clamping device, wherein the connecting portion has a structure that seals the core of the coaxial cable without exposing the core.

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