JP2726557B2 - Push-in cable mounting structure for signal light transmission of in-pipe observation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

In the present invention, as shown in FIG. 2, an in-pipe observation mirror A such as a fiberscope, a relay lens, and a television camera is connected to a push-in cable for signal light transmission (hereinafter simply referred to as a push-in cable) D.
The present invention relates to an in-pipe observation apparatus in which a pipe C is pushed into a pipe C such as a gas pipe or a water and sewage pipe, and the inside wall J of the pipe C is observed by a viewing mirror A. The present invention relates to an improvement in a mounting structure of a case B mounted outside the in-pipe observation mirror A and a push-in cable D for signal light transmission.

[Prior art]

2. Description of the Related Art Conventionally, there has been a structure shown in FIGS. 2 and 3 for mounting a push cable and a case mounted outside a viewing mirror in a conduit. 2, the fixing member F is bonded and fixed to the tension member E of the push-in cable D, and the tension member E is inserted into the case B. Next, the fixture L covering the outside of the sheath H of the push-in cable D is placed on the case B, and the two are screwed together with the threaded portion K. Is pushed inward, the locking claw P bites into the sheath H of the pushing cable D, and the case B is fixed to the pushing cable D. Furthermore, when the screw G attached to the case B is tightened,
The mounting member F is pressed against the inner peripheral surface of the case B so that the case B is fixed to the tension member E. 3 is similar to the one shown in FIG. 2, after inserting the push cable D into the case B,
Is tightened, the divided movable portion R of the case B is tightened to the case body S, and the push-in cable D is clamped and fixed to the case B. Next, screw G attached to case B
Is tightened, the fixture F is pressed against the inner peripheral surface of the case B, and the case B is fixed to the tension member E of the push-in cable D. In the mounting structure described above, an optical fiber serving as a light guide for the in-pipe observation mirror A, a communication line of the observation mirror A, etc.
Is mounted on the in-pipe observation mirror A from the push-in cable D through the through hole of the fixture F.

[Problems to be solved by the invention]

However, since the sheath H of the push-in cable D is made of a soft material such as polyethylene, the case B is connected to the inner wall of the pipe C every time the in-pipe observation device is inserted into the pipe in the mounting structure shown in FIG. When it hits J, the locking claw P
The sheath H is subjected to excessive force, and the recesses of the sheath H into which the locking claws P bite gradually increase, and the case B rattles, and the fastener L and the case B
Tightens loosely. When the case H abuts against the inner wall of the conduit even in the mounting structure of FIG. 3, an excessive force is applied to the portion of the sheath H sandwiched between the movable portion R and the case body S, and the sheath H is used for a long time. During this operation, the part is depressed and the case B is rattled, so that the bolt T is loosened. In such a case, an excessive force is directly applied to the optical fiber, the signal line, and the like U, and in a severe case, they may be damaged. Further, if the fixing between the case B and the push-in cable D is loosened as described above, a gap is formed between the two, and foreign matter such as gravel may enter the in-pipe observation apparatus from the gap and damage the apparatus. Was.

[Object of the invention]

It is an object of the present invention to provide a push-in cable mounting structure for signal light transmission of an in-pipe observation apparatus in which the case and the push-in cable sheath are not easily loosened.

[Means for Solving the Problems]

The push-in cable mounting structure for signal light transmission of the in-pipe observation apparatus of the present invention includes a case B outside the in-pipe observation mirror A such as a fiberscope or a television camera as shown in FIG.
In-pipe observation in which the sheath H of the push-in cable D and the tension member E to which the attachment F is attached are inserted, the case B is fixed to the attachment F, and the cable D is attached to the in-pipe observation apparatus. In the push-in cable mounting structure for signal light transmission of the device, the caulking ring 1 is put on the outer circumference of the sheath H of the push-in cable D, and the support ring 3 is inserted inside the sheath H and attached to the case B. The caulking ring 1 is sheathed by pressing of the fixture 2.
The case B is fixed to the sheath H by projecting and deforming the ring 1 into the sheath H by projecting to the side.

[Action]

In the push-in cable mounting structure for signal light transmission of the in-pipe observation apparatus of the present invention, the support ring 3 is inserted inside the sheath H as shown in FIG. When pushed to the sheath H side, the sheath H is supported by the support ring 3 and does not deform inward more than necessary. For this reason, when the fixing tool 2 is further tightened, the caulking ring 1 protrudes and deforms inward and bites into the sheath H. Therefore, the installation of the push-in cable D is ensured, and the sheath H is hardly deformed even if the case B collides with the inner wall J of the pipe C when the in-pipe observation device is inserted into the pipe C, and the sheath H is hardly deformed. Even when used, the fastening of the fixture 2 is unlikely to be loosened, so that the case B and the sheath H are firmly fixed.

【Example】

FIG. 1 shows an embodiment of a push-in cable mounting structure for signal light transmission of the in-pipe observation apparatus of the present invention. A shown in FIG. 1 is an in-pipe observation mirror such as a fiberscope or a television camera, which is used to observe an inner wall J of a pipe C such as a gas pipe, a water pipe, and a water pipe. B is a case attached to the outside of the observation mirror A. D is a push-in cable for signal light transmission of the in-pipe observation mirror A, E is a tension member made of FRP or the like of the cable D,
U denotes an optical fiber disposed outside the tension member E and serves as a light guide of the in-line observation mirror A, a communication line with the in-line observation mirror A, and W denotes an inner side provided on the outer periphery thereof. The coating film layer, H, is a sheath formed on the outer periphery of the inner coating layer W. These are the same as before,
An improved version of them is used. F shown in FIG. 1 is a fixture which is interposed between the case B and the tension member E. The mounting member F includes an inner mounting member 10 adhered and fixed to the tip of the tension member E, and an outer mounting member 11 fixed to the outside of the inner mounting member 10 with screws 12. The optical fiber, the communication line U and the like are mounted to the in-pipe observation mirror A through the through hole 13 formed in the outer mounting body 11. G shown in FIG. 1 is a fixing tool such as a set screw for fixing the case B to the fixture F, and thereby fixes the case B to the tension member E. In this embodiment, the case B is fixed to the tension member E by screwing the fixing tool G into a screw hole formed in the case B and pressing the mounting tool F against the inner peripheral surface of the case B. . In FIG. 1, reference numeral 1 denotes a caulking ring, which is made of metal or the like and is covered on the outside of the sheath H of the pushing cable D. Reference numeral 3 shown in FIG. 1 denotes a support ring inserted inside the sheath H. The support ring 3 is for supporting the sheath H so that the sheath H is not deformed even if the sheath H is pressed from the outside. Reference numeral 2 shown in FIG. 1 denotes a fixing tool. In this embodiment, two flat head screws are used by being screwed into screw holes of the case B. The fixing device 2 is configured such that the caulking ring 1 is protruded and deformed toward the sheath H by tightening the fixing device 2, and the protruding portion is cut into the sheath H so that the case B
Is fixed to the sheath H. In this embodiment, two fixtures 2 are used, but the number may be one or three or more, and the case B is firmly fixed to the sheath H by the pressing of the fixture 2. Just do it.

【The invention's effect】

In the push-in cable mounting structure for signal light transmission of the in-pipe observation apparatus according to the present invention, the swaging ring 1 is protruded toward the sheath H by the fixture 2 while the sheath H of the push-in cable D is supported by the support ring 3. Since the case B is deformed and its protruding portion cuts into the sheath H and the case B of the in-line observation mirror A is fixed to the sheath H, even if the case B collides with the inner wall J of the tube C, the case H Does not deform any more, the case B becomes less rattled,
Also makes it difficult to loosen. Therefore, the case B and the sheath H are not easily loosened even after long-term use, so that the optical fibers and signal lines U in the in-pipe observation device are not damaged, and foreign matter such as gravel is not removed. The device does not break into the roadside observation device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a push-in cable for signal light transmission of an in-pipe observation apparatus according to the present invention, and FIG. 2 is a push-in cable attachment for signal light transmission of a conventional in-pipe observation apparatus. FIG. 3 is a longitudinal sectional view showing an example of the structure, FIG. 3 is a longitudinal sectional view showing another example of a push-in cable for signal light transmission of a conventional in-pipe observation apparatus, and FIG. 4 is a ZZ section in FIG. FIG. 1 is a caulking ring 2 is a fixture 3 is a support ring A is an observation mirror in a pipeline B is a case C is a pipeline D is a push-in cable for signal light transmission E is a tension member F is a fixture G is a fixture H is a sheath

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirotoshi Ikema 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Inventor Toshimasa Tanimoto 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Yoshitaka Toriumi 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (56) References JP-A-62-123337 (JP, A) JP-A-60 JP-A-21020 (JP, A) JP-A-63-300958 (JP, A) JP-A-63-300959 (JP, A) JP-A-63-62755 (JP, U) JP-A-57-63251 (JP, U) ) Hikaru 1-163855 (JP, U)

Claims (1)

(57) [Claims] 1. A tension member E to which a sheath H of a push-in cable D for signal light transmission and a fixture F are attached is inserted into a case B outside an in-pipe observation mirror A such as a fiberscope or a television camera. The push-in cable for signal light transmission of the in-pipe observation device in which the case B is fixed to the fixture F and the cable D is attached to the in-pipe observation device.
A caulking ring 1 is put on the outer periphery of the sheath H, a support ring 3 is inserted inside the sheath H, and the caulking ring 1 is protruded and deformed toward the sheath H by the pressing of the fixture 2 attached to the case B. Then, the caulking ring 1 is sheath H
Characterized in that the case B is fixed to the sheath H by making it bite into the cable.