JP2003070141A - Protective structure of hanging cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective structure of a hanging cable capable of preventing a cable in a spring from being disconnected in spite of expansion of the spring or being caught in the spring. SOLUTION: In a shock absorbing mechanism provided with a coil like spring 2 for absorbing imparted shocks or the like and a cable inserted expandably into the spring 2, a cable part 5 is formed by inserting the cable into a spirally shaped tube having elasticity. Thereby, the apparent diameter of the cable increases, and the cable is prevented from slipping out of a space between pitches of the spring, so that damages or disconnection hardly happens by expansion of the spring or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension cable protection structure, and more particularly to a suspension cable protection structure for protecting a cable connected between two objects from impact.

[0002]

2. Description of the Related Art For example, there is a fish finder which comprises a levitation body which floats above the sea surface and an electronic device section which is submerged in the sea while being connected to the levitation body (float or the like). In the case of a device with a transmitter, antenna, battery, etc. mounted on the levitation body and various sensors built into the electronic equipment part, the levitation body and the electronic equipment part are connected by a cable, and this cable simultaneously serves as a connecting member. . In this type of device, when the device is dropped from the air, a large force is generated between the levitation body and the weight due to the weight of the electronic device section, which may cause damage or disconnection of the cable. Furthermore, even after the drop, a tensile force is formed between the levitation body and the electronic device section in the sea according to the change in the wave height, and as the wave height increases, excessive force is applied to the wire rod and its connection, and the cable It may cause damage or disconnection.

Therefore, in order to reduce the influence of pressure changes such as impact and tensile force, a buffer mechanism for reducing the force applied to the cable is provided between the levitation body and the electronic equipment section in the sea.
This buffer mechanism is a coil-shaped metal spring having a predetermined length, a cable built in the spring in an S-shape or a spiral shape, and holding both ends of the spring and penetrating both ends of the cable. And a member. When the spring expands and contracts in response to shocks and changes in wave height, the buffer mechanism in such a structure also expands and contracts the cable in the spring according to the change in the length of the spring, and the levitating body and the electronic device section under the sea. The tensile force applied between them can be reduced, and the force applied to the cable connecting them can be reduced. When the spring of the buffer mechanism expands and contracts, the cable inside the spring also expands and contracts, so the cable inside the buffer mechanism is protected from damage and the like.

[0004]

However, according to the conventional suspension cable protection structure, when the expansion and contraction of the spring in the buffer mechanism is not constant, the extra length of the cable in the buffer mechanism is shortened. If the extra length of the cable is long, part of the cable will come out of the gap as the spring stretches.
When the spring contracts, the cable portion that has come out remains sandwiched in the gap. On the contrary, when the extra length of the cable is short, when the spring extends, the cable also extends, so that a large force is applied to the cable and, in the worst case, the cable is broken.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a suspension cable protection structure capable of preventing the cable in the spring from being broken or pinched by the spring even if the spring expands or contracts.

[0006]

In order to achieve the above-mentioned object, the present invention provides a suspension cable protection structure connected to an electric device immersed in a fluid such as air or seawater.
A coil-shaped spring that supports any two points of the suspension cable while allowing the suspension cable to have an extra length, and absorbs a shock applied to the electric device or the suspension cable; and the coil-shaped spring. There is provided a suspension cable protection structure, characterized in that the suspension cable is provided in a space inside thereof and has a spiral tube through which the suspension cable is inserted.

According to this structure, the cable mounted in the spring so that it can expand and contract is inserted into the tube, and the cable and the tube expand and contract integrally with the expansion and contraction of the spring. The provision of the tube increases the apparent diameter of the cable and prevents it from slipping out of the gap between the spring pitches. Therefore,
Even if the cable in the spring has a long extra length, it is possible to prevent damage or disconnection from occurring due to the expansion and contraction of the spring.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a suspension cable protection structure according to the present invention. The cushioning mechanism 1 includes a coiled metal spring 2 having a predetermined length, connecting portions 3a and 3b for holding the upper and lower ends of the spring 2, and connecting portions 3a and 3a.
A spring fixture 4a for fixing the spring 2 to 3b,
4b, a spiral cable portion 5 (consisting of a cable 5a and a tube 5b) coaxially arranged in the spring 2, a holding member 6a provided at the center of the connecting portions 3a, 3b for holding the cable portion 5, 6b. Through holes 8a for inserting the cables 5a connected to the holding members 6a, 6b are formed in the connecting portions 3a, 3b.
8b is provided. Devices 9 and 10 are attached to the connecting portions 3a and 3b.

FIG. 2 shows a detailed structure of the cable section 5. The cable portion 5 is composed of a spiral cable 5a having resilience and a tube 5b into which the cable 5a is inserted. As the cable 5a, a cable that meets the specifications conventionally required is used. Therefore, the thickness, elastic force, length, etc. of the cable 5a are as usual. Cable 5a
The length is set so that there is an extra length even if the spring 2 reaches maximum extension. The tube 5b has an inner diameter that causes play in the inserted cable 5a, does not impair the elasticity and spiral shape required for the cable 5a, and does not deform or damage the cable 5a, such as rubber. Use synthetic resin such as vinyl, polyethylene, etc. The thickness of the tube 5b is set such that the pitch of the tube 5b is larger than the pitch of the spring 2. If the winding direction of the cable 5a and the tube 5b is opposite to the winding direction of the spring 2,
The effect of preventing the cable 5a and the tube 5b from protruding from the gap between the pitches of the spring 2 is further enhanced.

FIG. 3 shows a state in which the cushioning mechanism 1 having the structure shown in FIG. 1 is used by being connected to an electronic device. Illustration of some of the parts shown in FIG. 1 is omitted. Floating part 11 floating on the sea surface
The connecting portion 3a of the buffer mechanism 1 is connected to the bottom of the via a holding member 12 having a waterproof structure. A waterproof retaining member 13 is coupled to the connecting portion 3b of the buffer mechanism 1, and the cable 7b is pulled out from the retaining member 13. The other end of the cable 7b is connected to the electronic device unit 14.

When the device having the configuration shown in FIG. 3 is installed in the sea, a predetermined portion of the floating portion 11 floats above the sea surface and the other portion is submerged in the sea. The electronic device unit 14 sinks due to its own weight and pulls the buffer mechanism 1. When the wavefront changes, the floating portion 11 moves up and down in accordance with the change, so that a tensile force (impact) corresponding to this acts on the buffer mechanism 1 and the buffer mechanism 1
Spring 2 expands and contracts. The cable 5a and the tube 5b integrally expand and contract in association with the expansion and contraction of the spring 2. At this time, since the tube 5b is provided,
Even if the spring 2 extends, the tube 5b (cable 5a) does not jump out from the gap between the pitches. Therefore, the cable 5a is not damaged. Also, the tube 5b is always the spring 2
Since there is a gap between the cable 5a and the tube 5b, the cable 5a and the tube 5b contract without any resistance even when the spring 2 contracts.

Although the cable 5a and the tube 5b are spiral-shaped in the above embodiment,
It may be S-shaped.

[0013]

As described above, according to the protection structure for a suspended cable of the present invention, the cable mounted so as to be able to expand and contract in the spring is inserted into the tube, so that the cable in the spring has an extra length. Even when the length is long, it is possible to make it difficult for damage and cutting to occur when the spring expands and contracts.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a protection structure for a hanging cable according to the present invention.

FIG. 2 is a partial cross-sectional view showing a detailed configuration of a cable section in FIG.

FIG. 3 is a front cross-sectional view showing a state in which the cushioning mechanism according to the present invention is connected to another device and used.

[Explanation of symbols]

1 buffer mechanism 2 spring 3a, 3b connection part 4a, 4b Spring fixing device 5a cable 5b tube 6a, 6b, 12 holding member 7a, 7b cable 8a, 8b through hole 11 Float 13 Retaining member 14 Electronic Equipment Department

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02G 3/30 H02G 9/02 A 9/02 A01K 75/00 K // A01K 75/00 H02G 3/26 E (72) Inventor Hiroshi Terashima 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Hitachi Electric Cable Co., Ltd. Hidaka Plant (72) Inventor Yasuo Inaba 5-1-1 Hidaka-cho, Hitachi City, Ibaraki Hitachi Electric Cable Co., Ltd. F-term in Hidaka factory (reference) 2B106 AA01 DA14 PA04 3J066 AA22 BA01 BC07 BC10 BD01 BD05 5G357 DA06 DB01 DC20 DD01 DD05 DD13 5G363 AA07 BA01 BB01 DA02 DC10 5G369 AA06 BA02 BB01 BB02 EA01

Claims (4)

[Claims] 1. A structure for protecting a suspension cable connected to an electric device immersed in a fluid such as air or seawater, wherein any two points of the suspension cable are provided with an extra length. And a coil-shaped spring that absorbs a shock applied to the electric device or the suspension cable, and a spiral tube that is disposed in an internal space of the coil-shaped spring and that inserts the suspension cable. Suspended cable protection structure characterized by: 2. The suspension cable protection structure according to claim 1, wherein the coiled spring and the spiral tube are configured such that the winding directions are opposite to each other. 3. The spiral tube and the suspension cable inserted through the spiral tube have a length larger than a length in a central axis direction when the coiled spring extends. The hanging cable protection structure according to claim 1. 4. The suspension cable protection according to claim 1, wherein the spiral tube has an outer diameter larger than a gap generated between adjacent turns when the coiled spring extends. Construction.