JP4073394B2 - closure - Google Patents

Description

  The present invention relates to a closure having a minimum necessary function so that it can be installed in an aerial space.

  Closures have been extensively developed and the applicant has filed patent applications in the past. Such a prior art is disclosed in, for example, Patent Document 1 (Title of Invention: End Surface Member for Closure). This Patent Document 1 describes an invention related to an end face member for a closure, but the specification also discloses a closure. In such a prior art closure, in order to maintain airtightness and watertightness in the closure, the end face seal members disposed at both ends of the cable wiring closure are characterized.

  A similar conventional technique is also disclosed in, for example, Patent Document 2 (Title of Invention: Sealing member for cable connection portion closure). Also in Patent Document 2, the seal member is characterized.

JP 2002-296428 A (paragraph numbers 0017 to 0044, FIGS. 1 to 9) JP 2003-153424 A (FIG. 1)

The closures described in Patent Documents 1 and 2 have the effect of improving airtightness and watertightness. However, it has been difficult to provide an inexpensive closure because the manufacturing cost increases with the improvement of airtightness and watertightness. In view of such circumstances, the present inventor has conducted extensive experiments and installed in places where water tightness and air tightness are not required, such as underwater or underground, for example, in an imaginary place suspended from a messenger wire Then, it was found that it does not require excessive water tightness and air tightness, and can be used as a closure if the protection grade of JISC0920 satisfies about 4th grade (waterproof / splash-proof). There was a demand to provide an inexpensive closure by limiting excess functions with a simple configuration and having sufficient waterproof and splash-proof properties, only for aerial installations.
Also, since the closure is suspended from a messenger wire that is stretched over a support (so-called utility pole / telegraph pole), there is a situation where it is desired to avoid weight, and the structure of the closure itself has been reviewed to make it waterproof and There was also a circumstance that they wanted to realize further weight reduction without affecting the spray properties.

  Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to have sufficient waterproofing and splash-proofing properties for aerial installation purposes, and to reduce weight, reduce costs, and improve workability. It is to provide a closure that realizes the above.

The closure according to claim 1 of the present invention is:
A cable clamp portion of the left and right a pair for gripping the optical fiber cable,
A base plate in which a pair of left and right cable clamps are arranged on both sides;
One or a plurality of end face members attached to the pair of left and right cable clamps for sealing the optical fiber cable from the outside; and
A pair of left and right side frames respectively attached to the pair of left and right cable clamp portions so that the end face member is exposed to the outside;
When configured cover foldably has a plurality of side plates connected to the connecting portion, and a base cover which is formed in a box shape, is formed thin connecting portions of all Rutotomoni connected together by connecting portions, A cover that can be bent at these joints ;
With
The cover is attached to the side frame exposed along with the end face member on the left and right sides, and the base cover is attached to the cover, and the cover is closed while being bent and brought into contact with the side frame.

A closure according to claim 2 of the present invention is
The closure according to claim 1,
The end face member is
A hole provided in the rubber member body;
A pair of cable introduction portions that are provided in pairs on both side surfaces of the member body so as to sandwich the hole portion, and guide the optical fiber cable near the opening of the hole portion;
A thin film sandwiched between a pair of cable introduction parts and arranged to partition the inside of the hole,
Comprising two end face member main bodies,
When the two end surface member main bodies are butted against each other with the openings of the hole portions facing each other, the cable introduction portion and the thin film become end surface members that are in close contact with the optical fiber cable from both sides and sealed from the external environment.

A closure according to claim 3 of the present invention is
The closure according to claim 1 or claim 2,
The cable clamp part is
A lead screw;
A first gripping part that is installed on the near side and moves from the near side to the optical fiber cable side by feeding a feed screw;
A second gripping part installed on the back side and moving from the back side to the optical fiber cable side by feeding of the feed screw;
The 1st clamp part which consists of is provided, It is characterized by the above-mentioned.

A closure according to claim 4 of the present invention is
The closure according to claim 3,
In addition to the first clamp part, the cable clamp part has
A holding part;
A screw that is screwed into the holding portion and that fixes the optical fiber cable held by the holding portion at the tip;
It is characterized by including the 2nd clamp part which consists of.

A closure according to claim 5 of the present invention is
In the closure according to any one of claims 1 to 4,
The end surface member and the cover are drainage holes are provided at positions which are lower during imaginary installation of rainwater that has entered along the optical fiber cable the cover through the drain hole of the end face member drainage It is characterized by dropping down from the hole.

  According to the present invention as described above, it is possible to provide a closure that is sufficiently waterproof and splash-proof for the purpose of aerial installation and that realizes weight reduction, cost reduction, and workability improvement.

The best mode for carrying out the present invention will be described with reference to the drawings. First, the appearance of the closure will be described. FIG. 1 is an external perspective view of the closure of this embodiment, and FIG.
The appearance of the closure 100 is as shown in FIGS. 1 and 2, and includes a cover 10, a pair of left and right side frames 20, 20, a plurality of end surface members 30, and a pair of left and right hanger brackets 40. .

Next, the inside view of the closure will be described. FIG. 3 is an internal perspective view when the cover is removed from the closure of the present embodiment, and FIG. 4 is a front view of the same.
The interior of the closure 100 is configured as shown in FIGS. 3 and 4, and includes a pair of left and right side frames 20, 20, a plurality of end surface members 30, a pair of left and right hanger brackets 40, a base plate 50, and a pair of left and right sides. Cable clamp portions 60 and 60. The cable clamp part 60 further includes a first clamp part 61 and a second clamp part 62.
In the cover 10, for example, a fusion splicing tray 70 as shown in FIGS. 14 to 16 is provided, and a core wire drawn from a cable (not shown) is connected for wiring. Become.

Subsequently, each part will be described with reference to the drawings. FIG. 5 is a side view of the cover with the open / close cover open, and FIGS. 6 and 7 are external perspective views of the closure with the open / close cover open.
As shown in FIGS. 1 and 2 described above, the cover 10 includes an opening / closing cover 11 and a base cover 12 made of resin. As shown in FIG. 2, the opening / closing cover 11 and the base cover 12 are provided with a drain hole 13, which discharges rainwater that has entered the closure 100, as will be described later. The opening / closing cover 11 and the base cover 12 can be easily opened and closed by the buckle 14.

As shown in FIG. 5, the open / close cover 11 has three side plates 11a, 11b, and 11c connected to each other by connecting portions 11d and 11e. Further, the opening / closing cover 11 and the base cover 12 are connected by a connecting portion 11f.
The connecting portions 11d, 11e, and 11f are very thin and can be bent, and the opening / closing cover 11 can be opened and closed as shown in FIGS.
In addition, since a large number of beams are integrally formed in the cover 10 as shown in FIG. 7, the structure is mechanically robust.

  The base plate 50 is a metal plate having a structure as shown in FIGS. 3 and 4 and is made of a robust material. A tray support 51 is pivotally supported on the base plate 50 so as to be rotatable. As will be described later, the tray support portion 51 is used as a support when the fusion splicing tray 70 is pulled out.

The pair of left and right cable clamp portions 60, 60 are disposed on both sides of the base plate 50 as shown in FIGS. The cable clamp portion 60 has a function of gripping a plurality of cables (not shown).
As shown in FIGS. 3 and 4, the cable clamp portion 60 further includes a first clamp portion 61 and a second clamp portion 62.

Such a cable clamp portion 60 will be described in more detail. FIG. 8 is a cross-sectional view taken along line AA of the closure of the present embodiment, and FIG. 9 is a cross-sectional view taken along line BB.
8 and 9 are diagrams illustrating the first clamp portion 61 of the cable clamp portion 60. FIG. As shown in FIGS. 8 and 9, the first clamp portion 61 includes a feed screw 61 a, a first grip portion 61 b, and a second grip portion 61 c.

The first gripping portion 61b is an arc-shaped gripping portion and is installed on the near side (base cover side), and moves from the near side to the cable side (arrow a direction) by the feed screw 61a.
The second gripping portion 61c is an arc-shaped gripping portion, is installed on the back side (opening / closing cover side), and moves from the back side to the cable side (arrow b direction) by feeding of the feed screw 61a. Thereby, a cable (not shown) is gripped and fixed to the arc portion of the first gripping portion 61b and the second gripping portion 61c.

Moreover, the 2nd clamp part 62 is provided with the holding | maintenance part 62a and the screw 62b, as shown in the enlarged view of FIG. The holding part 62a is formed in a substantially C shape, and a cable is inserted through the holding part 62a. The cable in the holding part 62a is fixed by adjusting the screw 62b.
The cable clamp unit 60 firmly fixes the cable by the first clamp unit 61 and the second clamp unit 62.

As shown in FIGS. 1 to 3, the side frame 20 is attached to the cable clamp portion 60.
In this embodiment, the side frame 20 is attached to one cable clamp part 20, and further, the cable clamp part 60 is arranged in a pair of left and right.

One or more end face members 30 are attached to the cable clamp portion 60.
In this embodiment, three end face members 30 are attached to one cable clamp portion 60, and a pair of such cable clamp portions 60 are arranged on the left and right. The end face members 30 are disposed on both the left and right sides of the end face of the closure, seal the cable introduced from both sides of the closure 100 from the external environment, and prevent a situation where rainwater or the like enters from the introduction position of the cable.
Details of such an end face member will be described. 10 and 11 are component configuration diagrams of the end surface member, and FIGS. 12 and 13 are assembly configuration diagrams of the end surface member.
As shown in FIGS. 10 and 11, the end face member 30 for closure is paired with a pair of end face member bodies 31 and 31.

As shown in FIGS. 10 and 11, the end face member main body 31 is made of a soft plastic (or rubber) member main body, a hole 31a, a cable introducing portion 31b, a thin film 31c, and a locking projection 31d. And a locking hole 31e, a fixing protrusion 31f, a blocking film 31g, a thick part 31h, a flange 31i, and a drain hole 31j. The hole 31a is a semi-cylindrical hole, as is apparent from FIGS. The cable introduction part 31b is semicircular, and is provided so as to be paired on both sides with the hole part 31a interposed therebetween. The cable introduction part 31b plays the role of determining the passage position in order to allow the cable to pass through the hole part 31a. Before the end face member 30 is used, a substantially semicircular blocking film 31g is provided on the innermost periphery of the cable introduction portion 31b.
As will be described in detail later, when the cable is introduced, the blocking film 31g located on the innermost periphery moves while being pushed away, and the cable securely adheres to the blocking film 31g. Furthermore, in the cable introduction part 31b that does not introduce the cable, the blocking film 31g also plays a role of sealing from the external environment.

  A substantially semicircular thick portion 31h is provided outside the semicircular occlusion membrane 31g along a concentric circle that is the same center as the center of the semicircle, and the cable introduction portion 31b has a sufficient thickness. It is secured. Because of the thick portion 31h, even when the blocking film 31g is pushed away in the cable radial direction by the cable, or even when the cable moves in the cable extending direction (axial direction), the entire blocking film 31g Maintain shape.

Two thin films 31c that partition the inside of the hole 31a are formed inside the hole 31a. As is apparent from FIGS. 10 and 11, the thin film 31 c is formed in a bellows shape, and thus has a play portion that can be freely moved. Etc. can also be closely attached. In order to ensure that the thin film 31c is brought into contact with the cable, as is apparent from FIGS. 10 (a), (c), (d) and FIG. It is provided in a size that protrudes. As will be described later, the cable surely comes into close contact with the bellows portion of the thin film 31c.
As shown in FIG. 10B, the drain hole 31j is formed between the two thin films 31c.

The locking protrusion 31d is particularly formed in a bowl shape as shown in FIG. 10 (e), and the locking hole 31e is formed in a hole shape as shown in FIG. 11 (c). ing. As shown in FIGS. 12 and 13, the locking projection 31 d is fitted into the locking hole 31 e to form the end face member 30.
As shown in FIG. 12C, the formed end surface member 30 has drain holes 31j formed in two places. The drain hole 31j is attached to the cable clamp portion 60 so as to be on the lower side.

As shown in FIGS. 10 and 11, the fixing protrusion 31 f is a plurality of protrusions (two in this embodiment as shown in FIG. 11C) in one place, and is attached to the cable clamp 60. Is provided. The cable clamp portion 60 is also provided with a corresponding projecting portion (not shown), and can be attached by fitting a projection to the projecting portion.
The flange part 31i becomes a flange shape at the time of assembly, and reliably prevents the intrusion of rainwater on the side exposed to the outside of the end face member 10. Further, the end face member 30 itself has a strong structure. In this way, the flange portion 31i prevents rainwater from entering the inside of the closure and seals the closure from the external environment.

The attachment of the cable to such a closure 100 will be described. First, a cable is attached to the end face member 100.
When the cable is clamped by the pair of end surface member bodies 31, 31, the cable is disposed on the cable introduction portion 31b while pushing away the blocking film 31g, and the pair of cable introduction portions 31b are pressed so as to come into close contact with each other, and the gap is surely secured. Close up. The cable reaches the innermost circumference of the thick portion 31h, which is a semicircular cutout, and the blocking film 31g is in close contact with the cable.
For this reason, the cable introduction part 31b is sufficiently close to prevent rainwater or the like from entering the outside to some extent. Furthermore, even if rainwater reaches a little through the cable to the thin film 31c, in this case also, it drops down through the thin film 31c and drops down through the drainage hole 31j at the lowest position. Become. Finally, it drops from the drain hole 13 of the cover 10 described above, and water is discharged from the cover 10.

Subsequently, the end face member 30 through which the cable is inserted is attached to the cable clamp portion 60 as shown in FIGS. 3 and 4, and the cables (not shown) are attached to the first clamp portion 61 and the second clamp portion 62, and the base plate 50. The optical fiber of the cable is drawn out on a fusion splicing tray (not shown) on the center space and is spliced.
Subsequently, the cover 10 is attached to the closure as shown in FIG.

Then, the usage form by such a closure is demonstrated. FIG. 14, FIG. 15, and FIG. 16 are explanatory views for explaining the usage of the closure of this embodiment.
When such a closure is used, it is suspended from a messenger wire (not shown) in the state shown in FIG. When the connection in the closure 100 needs to be changed, the opening / closing cover 11 is opened as shown in FIG. 14, and the entire cover is removed as shown in FIGS. In such a state, one of the fusion splicing trays 70 is further pulled out by rotational movement and the splicing connection work is performed while being supported by the tray support portion 51 described above. As a result, the optical fiber is connected and replaced on the internal fusion splicing tray.

The above-described closure of the present invention has a structure in which a thin film abuts a cable at the end face member against a path where rainwater easily enters, such as a gap between the end face member and the cable, thereby preventing multiple ingress of rainwater. Prevents rainwater from entering inside.
Even when the opening / closing cover is closed, the protrusion of the opening / closing cover comes into contact with the groove portion of the cable clamp portion, and also in this respect, a situation where rainwater enters the closure is prevented.

  Moreover, even if it is a thin side plate, the beam is sufficiently stretched to have a light and robust structure. Furthermore, since the side plate is pivotally connected by the connecting portion, a structure such as a hinge is unnecessary, and this is also a light weight structure.

  In this way, the base cover and the opening / closing cover of the cover are integrated to reduce the cost by facilitating manufacture, and the waterproof and splash-proof properties can be maintained, and an inexpensive and high-performance closure can be obtained.

It is an external appearance perspective view of the closure of the best form for implementing this invention. FIG. 3 is a three-sided view of the appearance of the best mode closure for carrying out the present invention. It is an internal perspective view at the time of removing a cover from the closure of the best form for implementing this invention. It is a front view at the time of removing the cover from the closure of the best form for implementing this invention. It is a side view of the cover which opened the opening-and-closing cover. It is an external appearance perspective view of the closure which opened the opening-and-closing cover. It is an external appearance perspective view of the closure which opened the opening-and-closing cover. It is an AA line sectional view of the closure of the best form for carrying out the present invention. It is a BB sectional view of the best form closure for carrying out the present invention. FIG. 10 (a) is a front view, FIG. 10 (b) is a left side view, FIG. 10 (c) is a bottom view, and FIG. 10 (d) is a cross-sectional view along the line aa. FIG. 10E is an enlarged view, and FIG. 10F is an enlarged view. FIG. 11A is a left side view, FIG. 11B is a cross-sectional view taken along the line bb, and FIG. 11C is an enlarged view. FIG. 12A is a left side view, FIG. 12B is a front view, FIG. 12C is a bottom view, and FIG. 12D is a plan view. FIG. 13A is a right side view, FIG. 13B is a cross-sectional view taken along the line cc, and FIG. 13C is a cross-sectional view taken along the line dd. It is explanatory drawing explaining the usage form of the closure of the best form for implementing this invention. It is explanatory drawing explaining the usage form of the closure of the best form for implementing this invention. It is explanatory drawing explaining the usage form of the closure of the best form for implementing this invention.

Explanation of symbols

100: Closure 10: Cover 11: Opening and closing covers 11a, 11b, 11c: Side plates 11d, 11e, 11f: Connecting portion 11g: Projection 12: Base cover 13: Drain hole 14: Buckle 20: Side frame 30: End surface member 31 : End face member main body 31a: Hole 31b: Cable introduction part 31c: Thin film 31d: Locking protrusion 31e: Locking hole 31f: Fixing protrusion 31g: Blocking film 31h: Thick part 31i: Flange part feed screw 40: Hanger bracket 50: Base plate 51: Tray support part 60: Cable clamp part 61: First clamp part 61a: Feed screw 61b: First grip part 61c: Second grip part 62: Second clamp part 62a: Holding part 62b : Screw 63: Groove 70: Fusion splicing tray

Claims (5)

A cable clamp portion of the left and right a pair for gripping the optical fiber cable,
A base plate in which a pair of left and right cable clamps are arranged on both sides;
And the end surface members which are respectively mounted one or more pair of right and left cable clamp portion for sealing the optical fiber cable from the outside world,
A pair of left and right side frames respectively attached to the pair of left and right cable clamp portions so that the end face member is exposed to the outside;
When configured cover foldably has a plurality of side plates connected to the connecting portion, and a base cover which is formed in a box shape, is formed thin connecting portions of all Rutotomoni connected together by connecting portions, A cover that can be bent at these joints ;
With
The closure is characterized in that a base cover is attached to a side frame exposed along with the end face member on the left and right sides, and the cover is closed while the opening / closing cover is bent and brought into contact with the side frame. The closure according to claim 1,
The end face member is
A hole provided in the rubber member body;
A pair of cable introduction portions that are provided in pairs on both side surfaces of the member body so as to sandwich the hole portion, and guide the optical fiber cable near the opening of the hole portion;
A thin film sandwiched between a pair of cable introduction portions and arranged to partition the inside of the hole portion;
Comprising two end face member main bodies,
When abutting the end face member main body 2 of the opening are opposed to the hole portion, the closure, characterized in that the edge members for sealing from the external environment cable entry portion and thin film closely from both sides in the optical fiber cable . The closure according to claim 1 or claim 2,
The cable clamp part is
A lead screw;
A first gripping part that is installed on the near side and moves from the near side to the optical fiber cable side by feeding a feed screw;
A second gripping part installed on the back side and moving from the back side to the optical fiber cable side by feeding of the feed screw;
The closure characterized by including the 1st clamp part which consists of. The closure according to claim 3,
In addition to the first clamp part, the cable clamp part has
A holding part;
A screw that is screwed into the holding portion and that fixes the optical fiber cable held by the holding portion at the tip;
The closure characterized by including the 2nd clamp part which consists of these. In the closure according to any one of claims 1 to 4,
The end face member and the cover are provided with a water drain hole at a lower position during aerial installation, and rain water that has entered through the optical fiber cable is drained through the drain hole of the end face member. A closure characterized by dropping down from the hole.

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