JPH06163094A - Cable earthing structure - Google Patents

Abstract

PURPOSE:To provide a cable earthing structure capable of easily earthing a cable to a frame and never requiring the use of a small fastener element apt to be lost, for example, a set screw and a spring seat metal. CONSTITUTION:In a cable earthing structure for frame-earthing a cable 20 to the frame of an electronic device, substantially Ushaped mounting brackets 24; 28; 32 to enclose the shield wire exposed part 2Oa of the cable are formed from elastic material, and on each leg part 24a; 28a; 32a of the substantially U-shaped brackets, at least one protruding piece 24b; 28b; 32b is integrally formed. Further, opening parts 22b; 26a; 30a for engagingly locking the protruding pieces of the substantially U-shaped brackets on the earthing position of the frame are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable grounding structure for frame-grounding a cable on a frame of an electronic device. When connecting a cable to an electronic device such as a communication device from the outside, in order to eliminate the influence of noise on the signal transmitted by the cable, the shield wire of the cable should be grounded to the frame of the communication device. Is required.

[0002]

2. Description of the Related Art Referring to FIG. 4, there is shown a conventional cable grounding structure, in which 10 is an external cable to be connected to a communication device and 12 is formed integrally with a frame of the communication device. A grounding point, 14 is a hat-type fitting. As shown in the drawing, the outer cable 10 is partially removed from its outer cover to form a shielded wire exposed portion 10a. A semicircular recess 12a is formed in the grounding portion 12, and the shielded wire exposed portion 10a of the external cable 10 is formed therein.
Is housed. The shielded wire exposed portion 10a housed in the semicircular recess 12a is held by the hat-shaped mounting member 14. That is, a pair of insertion holes 14a are formed in the hat-shaped mounting member 14, while a pair of screw holes 12b arranged so as to be aligned with the pair of insertion holes 14a are formed in the grounding portion 12, and a set screw is formed. The shield wire exposed portion 10a is held in the semi-circular recess 12a of the grounding portion 12 by inserting 16 into the insertion hole 14a and screwing it into the screw hole 12b. The spring washer 18 is preferably used when the set screw 16 is screwed. Usually, the frame of the communication device is made of galvanized steel, so that the shield wire of the external cable 10 is electrically connected to the grounding portion 12 and is grounded to the frame. become.

[0003]

As is apparent from the above description, in the conventional cable grounding structure, there is a problem that a troublesome screwing work is involved when the cable is grounded, and when the screwing work is carried out. It is also pointed out that the set screws and spring washers tend to be lost. In addition,
If a lost set screw, a spring washer, or the like slips into the accommodation portion of the circuit board, it may cause a failure of the electronic device. Therefore, an object of the present invention is a cable grounding structure for frame-grounding a cable to a frame of an electronic device, which can easily ground the cable with respect to the frame and is a small stop element that tends to be lost. For example, to provide a cable grounding structure that does not require the use of setscrews or spring washers.

[0004]

According to the present invention, in a cable grounding structure for frame-grounding a cable to a frame of an electronic device, a substantially U-shaped mounting for surrounding a shielded wire exposed portion of the cable is provided. The tool is made of an elastic material and at least one projecting piece is integrally formed on each leg of the substantially U-shaped mounting tool, and the projecting piece of the substantially U-shaped mounting tool is locked to the grounding point of the frame. It is characterized by forming an opening for.

[0005]

As is apparent from the above construction, according to the present invention, at least one projecting piece integrally formed with each leg of the substantially U-shaped fixture is formed at the grounding portion of the frame. Since it is adapted to be locked to the portion, the exposed portion of the shielded wire of the cable can be held at the grounding portion of the frame with a substantially U-shaped attachment without using an attachment such as a set screw.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the cable grounding structure according to the present invention will be described below with reference to FIGS. First, FIG. 1 shows a first embodiment of a cable grounding structure according to the present invention, in which 20 is an external cable to be connected to an electronic device, for example, a communication device, 22
Is a grounding point integrally formed on the frame of the communication device, 24
Indicates a substantially U-shaped fixture. As in the case described with reference to FIG. 4, the external cable 20 has a shielded wire exposed portion 20a formed by partially removing the outer sheath thereof, and the grounded portion 22 is designed to accommodate the shielded wire exposed portion 20a. The semicircular recess 22a is formed. The substantially U-shaped fitting 24 is configured to have a size and shape capable of enclosing the shield wire exposed portion 20a, and is formed of, for example, a suitable metal plate material such as a steel plate or a copper plate, and is preferably nickel-plated. Each leg 24a of the substantially U-shaped fixture 24 has a protruding piece 2
4b is integrally formed, and this protruding piece 24b is preferably obtained by making a notch in a substantially U shape on the leg 24a and then pulling out the inner region thereof, but this protruding piece 24b is separated. It can also be formed as a body and attached to the leg portion 24a by soldering or welding. In addition,
In the illustrated embodiment, each leg 24a has only one protruding piece 24b, but multiple protruding pieces may be provided if desired. An opening 22b is formed on the side wall surface of the semicircular recess 22a, and both legs 24a of the substantially U-shaped attachment 24 are formed.
When pushing into the semicircular recess 22a, the protruding piece 24b
Are locked in the opening 22b. Therefore, the shield wire exposed portion 20 is provided in the semicircular recess 22a.
Both legs 24 of the substantially U-shaped fixture 24 in a state of accommodating a
By pushing a into the semi-circular recess 22a, the shield wire exposed portion 20a is held by the substantially U-shaped fitting 24. At this time, the shield wire exposed portion 20a is held in the semi-circular recess 2a.
It is electrically connected to 2a and is grounded to the frame of the communication device.

FIG. 2 shows a second embodiment of the cable grounding structure according to the present invention. In this second embodiment, the grounding portion 26 is formed as a flat portion integrated with the frame of the communication device. A pair of openings 26a are formed in the flat portion 26. On the other hand, each leg portion 28a of the substantially U-shaped attachment 28 extends in a strip shape, and two protruding pieces 28b are formed therein. The substantially U-shaped attachment 28 is also made of the same material as in the first embodiment described above, and the protruding piece 28b is also formed in the same manner as the protruding piece 24b shown in the first embodiment. obtain. Exposed portion of shielded cable (Fig. 2
(Not shown in the figure) is inserted between the pair of openings 26a, the legs 28a of the substantially U-shaped fixture 28 are inserted into the openings 26a, so that the protruding piece 28b is locked in the openings 26a. The shielded wire exposed portion is grounded to the frame of the communication device as in the case of the first embodiment. It should be noted that in the second embodiment, approximately U
Each leg 28a of the V-shaped fitting 28 has only two protrusions 28b, but it is also possible to provide more than one protrusion, in this embodiment a strip leg 28a to the opening 26a. By adjusting the insertion amount into the
A feature is that the character-shaped fitting 28 can be applied to cables of various diameters.

FIG. 3 shows a third embodiment of the cable grounding structure according to the present invention. In this third embodiment as well, the grounding point 30 is the frame of the communication device as in the second embodiment described above. And a pair of openings 30a are formed in the flat portion 30. In the third embodiment shown in FIG. 3, the substantially U-shaped attachment 32 is made of a plastic material having an appropriate elasticity, and the inner surface thereof is lined with a metal plate 34 made of copper or steel. Each leg portion 32a of the substantially U-shaped attachment 32 is provided with a large number of saw-toothed protrusions 32b as projecting pieces, and these saw-toothed protrusions 32b are integrally formed when the substantially U-shaped attachment 32 is formed. When the shielded wire exposed portion (not shown in FIG. 3) of the cable is placed between the pair of openings 30a, when the legs 32a of the substantially U-shaped fixture 32 are inserted into the openings 30a, the sawtooth protrusions 32b are formed. The shield wire exposed portion is locked to the opening portion 30a, and thus the shield wire exposed portion is grounded to the frame of the communication device as in the case of the first and second embodiments.

As described above, in the first and third embodiments, the substantially U-shaped attachment itself is made of a metal material, and in the third embodiment, the substantially U-shaped attachment is made of a plastic material. Although the metal plate is lined on the side surface to give conductivity to the substantially U-shaped fixture, as long as sufficient electric conduction can be obtained between the grounded portion of the frame and the shielded wire exposed portion, It is also possible for the substantially U-shaped fixture to be formed solely from an insulating material, for example a plastic material. Further, in the above-mentioned embodiment, the grounding point is formed integrally with the frame of the communication device, but a metal seat that provides the grounding point may be attached to the frame by welding or the like.

[0010]

As is apparent from the above description, according to the present invention, with respect to the grounding of the cable with respect to the frame of the electronic device such as the communication device, a small stop element such as a set screw or a spring washer which is apt to be lost. It is possible to obtain the operational effect that the process can be performed easily and quickly without using the above. Also,
According to the present invention, there is no need to use any small stop elements that tend to be lost, so there is no electronic device failure that can occur when such stop is lost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a cable grounding structure according to the present invention.

FIG. 2 is a perspective view showing a second embodiment of the cable grounding structure according to the present invention.

FIG. 3 is a perspective view showing a third embodiment of the cable grounding structure according to the present invention.

FIG. 4 is a perspective view showing a conventional cable grounding structure.

[Explanation of symbols]

 20 ... External cable 20a ... Shielded wire exposed part 22 ... Grounding part 22a ... Semicircular recess 22b ... Opening part 24 ... Almost U-shaped fixture 24a ... Leg part 24b ... Projection piece 26 ... Grounding part 26a ... Opening part 28 ... Almost U V-shaped attachment 28a ... Leg 28b ... Projecting piece 30 ... Grounding point 20a ... Opening 32 ... Substantially U-shaped attachment 32a ... Leg 32b ... Sawtooth projection 34 ... Metal plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Shinohara 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (5)

[Claims] 1. A cable grounding structure for frame-grounding a cable (20) to a frame of an electronic device, wherein a substantially U-shaped fitting (24) is arranged to surround a shielded wire exposed portion (20a) of the cable. 28; 32) are formed of elastic material and each leg (2) of the substantially U-shaped fixture is
4a; 28a; 32a) is integrally formed with at least one projecting piece (24b; 28b; 32b), and is used to lock the projecting piece of the substantially U-shaped fixture at the grounding point of the frame. A cable grounding structure characterized in that openings (22b; 26a; 30a) are formed. 2. The cable grounding structure according to claim 1, wherein the shielded wire exposed portion (22a) of the cable (20) is accommodated in a grounding portion of the frame in a semicircular recess (22a). Is formed, the opening (22b) is formed on the side wall surface of the semi-circular recess, and the leg (24a) of the substantially U-shaped fixture (24) is pushed into the semi-circular recess. A cable grounding structure characterized in that a protruding piece (24b) is locked in the opening. 3. The cable grounding structure according to claim 1, wherein a ground portion of the frame is a flat portion (26; 30), and the opening portion (26a; 30a) is formed in the flat portion. The substantially U-shaped fitting (28; 32) in the opening
Cable grounding structure, characterized in that when the leg portions (28a; 32a) are inserted, the protrusion pieces (28b; 32b) are locked in the opening portion. 4. The cable grounding structure according to claim 1, wherein the U-shaped fixture (24;
28) A cable grounding structure in which 28) is formed of a metal plate material. 5. The cable according to any one of claims 1 to 3, wherein the U-shaped fitting (32) is made of a plastic material, and a metal plate (34) is lined on the inner side surface thereof. Cable grounding structure characterized by.