Optical cable junction box having micro cable duct sealing unit

Abstract

An optical cable junction box having a micro cable duct sealing unit, according to the present invention, comprises: a support frame in which splice trays for connection of an optical cable are provided; a base member supporting the support frame and having a plurality of mounting units penetrated for lead-in and lead-out of cables; a cover member coupled to the base member so as to encompass the support frame, thereby maintaining airtightness; and the micro cable duct sealing unit coupled to the mounting units of the base member so as to encompass micro cable ducts, thereby maintaining airtightness from the outside and fixing the micro cable ducts.

Description

Optical cable junction box with micro cable duct sealing unit.

[0001] The present invention relates to an optical cable connection box, and more specifically, to an optical cable connection box having a micro cable duct sealing unit with improved sealing structure of the inlet and outlet portions of a micro cable duct in which an optical fiber is installed.

[0002] Generally, optical cables are a means of transmitting optical signals. Unlike cables that transmit electrical signals, they can transmit large amounts of information quickly and without loss. Furthermore, optical cables are comprised of multiple optical cable clusters, each of which consists of a collection of multiple optical fibers.

[0003] Because these optical cables cannot be manufactured in infinite lengths, they are manufactured in fixed lengths and wound on drums. For installation, the cables must be connected. Optical cable installation methods can be broadly categorized into towed and pneumatic installation. Pneumatic installation utilizes micro cable ducts to form the conduit.

[0004] Meanwhile, optical cable junction boxes are used to connect or branch optical cables. These optical cable junction boxes are installed in various locations, such as subscriber lines, central offices, and relay stations. They are designed to distribute, secure, connect, and organize optical cables for connection to multiple systems or demand households.

[0005] An optical cable junction box is provided with an optical cable or micro cable duct having optical fibers for connection of optical cables, into and out of the interior of the box. A fixing means is provided to protect the connection part from tension applied to the optical cable or micro duct, and a watertight means is provided to prevent moisture from entering the interior of the box when installed outdoors or in an underground space.

[0006] Korean Patent No. 10-1249768 and Publication No. 2015-0021758 disclose enclosures for micro cable ducts. These enclosures are relatively difficult to secure and seal the micro cable ducts.

[0007] Korean Patent Registration No. 10-1846216 discloses an optical fiber connection terminal box, and Korean Patent Publication No. 2021-0062328 (May 31, 2021) discloses an optical connection box.

[0008] The posted optical connector comprises: a cover having an accommodation space therein; a base mounted on the lower portion of the cover; and a sealing member mounted on a mounting portion formed on the base, wherein an optical cable introduced or withdrawn through the mounting portion is interposed; and a pressure plate provided on opposite sides of the sealing member to increase a cross-sectional area within the mounting portion of the sealing member.

[0009] Korean Patent No. 0233344 discloses a cable connection sealing device. The disclosed sealing device comprises a cable connection sleeve and a sealing plate that can be coupled to one end of the sleeve, thereby moving an inner element so that the sealing ring can be brought into close contact with the outer surface of the cable.

[0010] The conventional joint box configured as such can increase the sealing force with the cable, but the support force of the cable to the joint box is relatively weak.

[0011] EP Patent No. 2136118 discloses a device for sealing an optical cable passing through a container for optical fibers, and EP Publication No. 2136118 discloses a device for passing a conduit through a wall.

[0012] The present invention is intended to solve the above-described problems, and provides an optical cable connection box having a micro cable duct sealing unit that can improve the fixing force and watertightness of a micro cable duct by using a shape deformation and a tightening holder of a sealing member installed in a mounting portion for introducing and withdrawing a micro cable duct in which an optical fiber is installed.

[0013] Another object of the present invention is to provide an optical cable connection box having a micro cable duct sealing unit that can protect the connection part of an optical fiber by improving the fixing force of an optical cable, improve the workability according to the combination and separation of an optical cable or micro cable duct for sealing, and can be applied interchangeably according to changes in the diameter of the micro cable duct.

[0014] In order to achieve the above purpose, the optical cable connection box having the micro cable duct sealing unit of the present invention comprises a support frame on which connection trays for connecting optical cables are installed, a base member having a plurality of mounting portions through which the support frame is supported and through which cables are introduced and discharged,

[0015] A cover member that is combined with the above base member to wrap the above support frame and maintain confidentiality,

[0016] It is characterized by having a micro cable duct sealing unit that is connected to the mounting parts of the above base member to wrap the micro cable ducts and secure them while maintaining airtightness from the outside.

[0017] In the present invention, an optical cable sealing unit is further provided to secure the optical cable by wrapping the outer surface of the optical cable and maintaining airtightness, and is installed on at least one of the mounting portions formed on the base member.

[0018] An optical cable connection box having a micro cable duct sealing unit of the present invention can increase the airtightness according to the introduction and withdrawal of a micro cable duct or optical cable into and out of a partitioned space inside a mounting portion formed on a base member, and can prevent damage to the connection portion of the micro duct or optical cable due to external force.

[0019] Figure 1 is an exploded perspective view of an optical cable connection box having a micro cable duct sealing unit according to the present invention;

[0020] Figure 2 is an exploded perspective view showing an excerpt of a main part of an optical cable connection box having a micro cable duct sealing unit according to the present invention.

[0021] Figure 3 is an exploded perspective view showing the micro cable duct sealing unit illustrated in Figure 1.

[0022] Fig. 4 is an exploded perspective view showing the optical cable sealing unit illustrated in Fig. 1.

[0023] Figure 5 is a cross-sectional view of the optical cable sealing unit taken along line A-A'.

[0024] Figure 6 is a B-B' cross-sectional view of the optical cable sealing unit.

[0025] Fig. 7 is a cross-sectional view showing a state in which a micro cable duct is supported by a sealing unit.

[0026] Fig. 8 is a cross-sectional view showing an optical cable supported by an optical cable sealing unit.

[0027] Embodiments of an optical cable connection box having a micro cable duct sealing unit according to the present invention are shown in FIGS. 1 to 4.

[0028] Referring to the drawing, an optical cable connection box (10) according to the present invention comprises a base member (20), a cover (40) coupled to the base member (20) and sealing a space in which connection trays for connecting optical cables are mounted, a micro cable duct sealing unit (50) installed in the mounting portions (21) of the base member (20) to maintain watertightness between a micro cable duct (200) that is introduced or withdrawn and the mounting portion (21), and an optical cable sealing unit (80) installed in at least one of the mounting portions (21) to seal between the outer surface of the optical cable and the inner surface of the mounting portion.

[0029] The optical cable connection box according to the present invention, configured as described above, will be described in more detail by component as follows.

[0030] The above base member (20) is provided with a support frame (12) on which connection trays (25) for connecting optical fibers branched from a micro cable duct (200) or an optical cable (300) are mounted on the upper surface side, and the above base member (20) is provided with a plurality of mounting portions (21) for introducing and withdrawing micro cable ducts (200) and introducing and withdrawing optical cables (300).

[0031] The above mounting portion (21) is arranged and installed so as to penetrate the base member (20), and is formed in an oval cross-section. In addition, ribs are formed between the mounting portions (21) formed on the base member (20) so that they can be interconnected.

[0032] The above cover (40) is combined with the base member (20) to enclose the support frame (12) on which the connection trays (25) are installed, thereby defining a sealed space. The combination of the cover (40) and the base member (20) can be achieved by a toggle clamp (26) with packing interposed at the connection portion. In addition, a separate ring member for suspending the connection box can be installed on the outer circumference of the cover (40).

[0033] The above micro cable duct sealing unit (50) is mounted on each of the mounting portions (21) formed on the base member (20) to support the micro cable ducts (200) in which optical fibers are installed, and maintains watertightness between the outer surface of the micro cable ducts (200) and the inner surface of the mounting portion (21) when the micro cable ducts (200) flow into and out of the internal space partitioned by the cover (40) and the base member (20).

[0034] This micro cable duct sealing unit (50) is inserted and fixed into the mounting portion (21) of the base member (20) while supporting the micro cable duct (200) in which the optical fiber is installed, as shown in FIGS. 1 to 3, and is provided with first and second pressurizing members (51) (55) having the same shape as the hollow portion (21a) of the mounting portion (21). And, it is provided with a first sealing member (58) that is installed between the first and second pressure members (51) (55) and is deformed by the pressure applied by the first and second pressure members (51) (55) so as to be in close contact with the outer surface of the micro cable duct (200) in which the optical fiber is installed and the inner surface of the hollow portion (21a) of the mounting portion (21), and a fastening member (60) for deforming the first sealing member (58) by causing the first and second pressure members (51) (55) to be in close contact with each other in a corresponding direction.

[0035] A plurality of first insertion holes (52) are formed in the first pressure member (51) of the sealing unit (50), and a plurality of second insertion holes (56) are formed in the second pressure member (55) so as to be positioned coaxially with the first insertion holes (52). In addition, a plurality of third insertion holes (59) are formed in the first sealing member (58) located between the first and second pressure members (51) (55) so as to be positioned coaxially with the first and second insertion holes (52) (56). The first, second, and third insertion holes (59) are formed to be larger than the outer diameter of the micro cable duct (200) within a tolerance range set for joining.

[0036] The first sealing member (58) may be made of an elastic material such as silicone, rubber, or synthetic rubber so that the diameter of the third insertion hole (59) formed therein becomes smaller when the first sealing member (58) is deformed when pressurized by the first and second pressurizing members (51) (55).

[0037] And the above-mentioned fastening part (60) is provided with fastening bolts (62) that are installed at predetermined intervals on the second pressure member (55) and are screw-connected with the fixing nuts (61) by penetrating the first pressure member (51) and the first sealing member (58) from the lower surface of the first pressure member (51) to move the first and second pressure members (51) (55) toward the first sealing member (58) and pressurize them.

[0038] Meanwhile, a tightening holder (70) for holding the micro cable duct (200) is further provided between the first sealing member (58) and the second pressure member (55).

[0039] The above-described tightening holder (70) has a holder body (72) having grip holes (71) formed on a side corresponding to the second insertion hole (56) formed in the first pressurizing member (55). At least two gripping pieces (73) are formed at the edge of each of the gripping holes (71) formed in the holder body (72) to grip the micro cable duct (200) by a bonding force coupled with the second insertion hole (56). The outer circumferential surfaces of the gripping pieces (73) formed at the edge of the gripping hole (71) are formed to be inclined so that the thickness increases from the end side toward the base side.

[0040] The outer surface slope of the grip piece (73) acts to bend the grip piece toward the center of the grip hole (71) when combined with the second insertion hole (56). The second insertion holes (56) provide a bending force that bends the grip pieces (73) toward the center when combined with the grip pieces (73).

[0041] The above holder body (72) is further provided with a setting rod (74) for setting the joining position of the second insertion hole (56) and the grip pieces (73) when combined with the second pressure member (55).

[0042] Meanwhile, the optical cable sealing unit (80) is inserted and fixed into the mounting portion (21) formed on the base member (20) while supporting the optical cable (300) with the optical fiber installed as shown in FIGS. 1 and 5, and is provided with third and fourth pressurizing members (90) (130) having the same shape as the hollow portion (21a) of the mounting portion (21). And, it is provided with a second sealing member (110) that is installed between the third and fourth pressure members (90) (130) and is deformed by the pressure applied by the third and fourth pressure members (90) (130) so as to be in close contact with the outer surface of the optical cable (300) and the inner surface of the hollow portion (21a) of the mounting portion (21), and a fastening member (140) for deforming the second sealing member (80) by causing the third and fourth pressure members (90) (130) to be in close contact with each other in a corresponding direction.

[0043] The second pressure member (90) of the optical cable sealing unit (80) has a first coupling portion (100) for maintaining a coupled state, and includes first and second unit pressure members (93) (94) that form at least one first cable insertion port (91). The external shape of the first and second unit pressure members (93) (94) in which the coupling is made may vary depending on the cross-sectional shape of the mounting portion (21), and may be formed in an oval shape.

[0044] And it is preferable that the first cable insertion hole (91) is formed in a direction parallel to the central axis of the mounting portion (21) on the mutually opposing sides of the first and second unit pressure members (93) (94) so ​​as to form a circle when the first and second unit pressure members (93) (94) are joined. It is preferable that the diameter of the first cable insertion hole (91) is formed to have a diameter equal to or larger than the diameter of the optical cable connected through the connection box. The size and number of the diameters of the first cable insertion holes (91) formed in the first and second unit pressure members (93) (94) can be formed in various ways within a range that is not indirect to the first coupling portion (100) and the fastening portion (140) of the first and second unit pressure members (93) (94).

[0045] The first coupling portion (100) comprises a first protrusion support portion (101) formed by being introduced from the lower surface of the first unit pressure member (93), a first coupling protrusion (103) extending from the side surface of the first unit pressure member (93), a second protrusion support portion (105) formed by being introduced from the upper surface of the second unit pressure member (94), and a second coupling protrusion (107) extending from the side surface of the second unit pressure member (93).

[0046] The first protrusion support portion (101) formed on the first unit pressure member (93) is formed such that a first support hole (101a) having a predetermined diameter is formed from the lower surface of the first unit pressure member (93), and a first guide portion (101b) is formed toward the first support hole (101a) in the direction of the second unit pressure member (94) and is opened with a width smaller than the diameter of the first support hole (101a). In addition, the first coupling protrusion (103) has a first extension portion (103a) coupled with a second guide portion described later, and a first catch portion (103b) formed at an end of the first extension portion (103a) and having the same diameter as the second support hole described later. A first through hole (103c) communicating with the second support hole described later is formed in the first catch portion (103b).

[0047] The second protrusion support member (105) formed on the second unit pressure member (94) has substantially the same configuration as the first protrusion support member (101), and the second catch (107) has substantially the same structure as the first catch (103).

[0048] That is, the second protrusion support portion (105) formed on the second unit pressure member (94) is formed by forming a second support hole (105a) having a predetermined diameter from the upper surface of the second unit pressure member (94), and forming a second guide portion (105b) that is formed from the second support hole (105a) in the direction of the first coupling member (93) and is opened with a width smaller than the diameter of the second support hole (105a). In addition, the second coupling protrusion (107) has a second extension portion (107a) that is coupled with the first guide portion (101b) and a second catch portion (107b) that is formed at an end of the second extension portion (107a) and is coupled to the first support hole described later. A second through hole (107c) that is connected to the first support hole (101a) is formed in the second hanging portion (107b).

[0049] And as shown in FIGS. 4 and 6, the fourth pressure member (130) has a structure substantially similar to the third pressure member (90), and an auxiliary cable fixing member (150) may be further provided on the lower side.

[0050] The fourth pressurizing member (130) of the optical cable sealing unit (80) has a second coupling portion (120) for maintaining a coupled state, and includes third and fourth unit pressurizing members (133) (134) that form at least one second cable insertion port (131). The second cable insertion ports (131) formed by the first and second unit pressurizing members (133) (134) are formed in the same number as the number of first cable insertion ports (91) formed in the first pressurizing member (90).

[0051] The second connecting portion (120) has a third protrusion support portion (121) formed by being introduced from the lower surface of the third unit pressing member (133), a third connecting projection (123) extending from the side surface of the third unit pressing member (133), a fourth protrusion support portion (125) formed by being introduced from the upper surface of the fourth unit pressing member (134), and a second connecting projection (127) extending from the side surface of the fourth unit pressing member (124).

[0052] The third protrusion support portion (121) formed on the third unit pressure member (133) is formed by forming a third support hole (121a) having a predetermined diameter from the lower surface of the third unit pressure member (133), and forming a third guide portion (121b) from the third support hole (121a) in the direction of the fourth unit pressure member (134) and opening with a width smaller than the diameter of the third support hole (121a). In addition, the third coupling protrusion (123) is provided with a third extension portion (123a) coupled with a second guide portion described later, and a third catch portion (123b) formed at an end of the third extension portion (123a) and having the same diameter as the fourth support hole described later. A third through hole (123c) that is connected to the fourth support hole described later is formed in the third hanging part (123b).

[0053] The fourth protrusion support member (125) formed on the fourth unit pressure member (134) has substantially the same configuration as the third protrusion support member (121), and the fourth catch (127) has substantially the same structure as the third catch (123).

[0054] That is, the fourth protrusion support portion (125) formed on the fourth unit pressing member (134) is formed by forming a fourth support hole (125a) having a predetermined diameter from the upper surface of the fourth unit pressing member (134), and forming a fourth guide portion (125b) from the fourth support hole (125a) in the direction of the third unit connecting member (133) and opening with a width smaller than the diameter of the fourth support hole (125a). In addition, the fourth connecting protrusion (127) has a fourth extension portion (127a) coupled to the fourth guide portion, and a fourth catch portion (127b) formed at an end of the fourth extension portion (127a) and coupled to the third support hole. A fourth through hole (127c) communicating with the third support hole (121a) is formed in the fourth catch portion (127b). The shape of the third and fourth support holes (121a) (125a) and the third and fourth catches (123b) (127b) is not limited to a circle, and may be formed in the shape of a dovetail.

[0055] The auxiliary cable fixing member (150) formed on the lower surface of the fourth pressure member (130) is for fixing the optical cable (300) that flows in or out through the second cable insertion port (131) of the sealing unit (80), and is provided with first auxiliary cable fixing pieces (152) that extend downward on at least one of the lower surface of the third unit pressure member (133) and the lower surface of the fourth unit pressure member (134) and have a plurality of first fixing holes (151) formed therein.

[0056] In practice, the first auxiliary cable fixing member (152) is formed to extend downward from the edge of the second cable insertion port (131). In addition, the auxiliary cable fixing member (150) is further provided with a band (not shown) for fixing an optical cable (300) that is inserted into a first fixing hole (151) formed in the first auxiliary cable fixing member (152) and introduced or discharged through the second cable inlet port.

[0057] The second sealing member (110) of the optical cable sealing unit (80) is installed between the third pressure member (90) and the fourth pressure member (130), and is deformed as it is compressed by the third and fourth pressure members (90) (130) to come into close contact with the inner surface of the mounting portion (21) and the optical cable (300) supported thereon, thereby maintaining watertightness. The second sealing member (110) is formed with cable holding holes (111) corresponding to the first and second cable insertion portions (91) (131), and first and second connecting holes (115) (116) corresponding to the first and third support holes (101a) (121a) and the second and fourth support holes (121a) (125a) formed in the third and fourth pressure members (90) (130), respectively. The second sealing member (110) has a structure that can be pressed against the inner surface of the mounting portion (21) and the outer surface of the optical cable (300) inserted into the cable grip hole (111) when pressurized by the first and second pressurizing members (90) (130). The second sealing member (110) can have at least one cut portion (117) formed in the width direction so that a cable can be smoothly inserted into the cable grip hole (111) formed therein.

[0058] The second sealing member (110) is made of a flexible material that can be elastically deformed. The second sealing member (110) may be made of silicone or soft rubber, and has a shape substantially similar to the cross-sectional shape within the mounting portion (21) or the shape of the third and fourth pressurizing members (90) (130).

[0059] When the diameter of the optical cable (300) is relatively smaller than the diameters of the first and second cable grip holes (91) (131), watertightness can be achieved when an auxiliary sealing member (not shown) in which auxiliary cable grip holes having a diameter corresponding to the diameter of the optical cable (300) for sealing are formed is respectively coupled to the cable grip holes (111). At least one auxiliary cable grip hole can be formed in the auxiliary sealing member.

[0060] The above-mentioned fastening member (140) is connected to the third pressure member (90) and the fourth pressure member (130) to move them in corresponding directions so that the second sealing member (110) positioned between them is pressed, and is provided with fastening bolts (141) (142) penetrating through the first and second pressure members (90) (130) and the second sealing member (110), and fastening members (143) that are screw-connected to the fastening bolts (141) (142), respectively.

[0061] The fastening bolt (141) on one side is inserted into the third support hole (121a) and the fourth through hole (127c) of the fourth catch (127b) inserted therein, the first connecting hole (115) of the second sealing member (110) and the second through hole (107c) of the first support hole (101a) and the second catch (107b) connected thereto, and then is screw-connected with one side of the fastening member (143), and the fastening bolt (142) on the other side is inserted into the third through hole (123c) of the third connecting part connected to the fourth support hole (125a), the second connecting hole (116), the first through hole (103c) of the first catch (103b) connected to the second support hole (125a), and the second supporting hole (105a). It is screw-connected to the other side of the fastening member (143).

[0062] The above-described fastening member (140) is not limited to the above-described embodiment, and may have any structure that can bring the first and second pressure members (90) (130) into close contact with the sealing member (110).

[0063] Meanwhile, a separation prevention protrusion (not shown) may be formed on the inner surface of the mounting portion (21) to prevent the optical cable sealing unit (80) from being detached once it is coupled, and an insertion restriction protrusion (137) may be formed on the outer surface of the lower side of the third pressure member (91) to prevent the optical cable sealing unit (80) from being inserted into the mounting portion (21).

[0064] In addition, the base member (20) installed in the mounting portion (21) may further be provided with a sealing unit separation prevention portion to prevent the sealing unit (50) inserted into the mounting portion (21) from being separated.

[0065] Meanwhile, a cable fixing member (160) protruding from the upper surface of the base member (20) and the upper surface of the micro cable duct sealing unit (50) and the optical cable sealing unit (80) may be further provided to fix the optical cable to the tension line.

[0066] The optical cable connection box having a micro cable duct sealing unit according to the present invention, which is configured as described above, includes a micro cable duct sealing unit (50) coupled to mounting portions (21) of a base member (20) and an optical cable sealing unit (80), and optical fibers (optical cores) of optical cables (300) are connected by connection means including a connection tray supported on a frame (12).

[0067] This optical cable connection box (10) is formed by connecting the base member (20) and the cover (40) with a clamp to form a sealed space blocked from the outside, and the watertightness of the sealed space is maintained by the micro duct sealing unit (50) and the optical cable sealing unit (80) inserted into the mounting portion (21) while supporting the micro cable duct (200) and the optical cable (300).

[0068] In addition, since the micro cable duct (200) and the optical cable (300) are supported in a solid state by the respective sealing units (50) (80), the micro cable duct (200) and the optical cable (300) can be prevented from being separated from the connection box by an external traction force acting on the micro cable duct (200) and the optical cable (200), and further, short circuits of the optical cores connected by the connection means including the connection tray can be prevented.

[0069] To explain this in more detail, in order to maintain airtightness according to the introduction and withdrawal of the micro cable duct (200) by being combined with the mounting portion (21) formed on the base member (20) of the optical cable connection box (10), the first pressure member (51) and the second pressure member (55) of the micro cable duct sealing unit (50) and the first sealing member (58) and the tightening holder (70) positioned therebetween are temporarily assembled using the fastening portion (60). At this time, the end of the gripping piece (73) of the tightening holder (70) remains coupled to the second support hole (56) of the second pressure member (55).

[0070] In this state, a micro cable duct (200) for fixing is inserted into the first insertion hole (52) of the first pressure member (51), the third insertion hole (59) of the sealing member (58), the holding hole (71) of the brazing holder (70), and the second insertion hole (56) of the second pressure member (55).

[0071] The insertion of the above micro cable duct (200) is not limited to the above-described embodiment, and the first pressure member (51), the first sealing member (58), and the second pressure member (55) can be performed independently.

[0072] As described above, the first sealing units (50) that are connected to the micro cable duct (200) are inserted into each mounting portion (21). At this time, the insertion limiting protrusion (53) is made to be in close contact with the edge of the mounting portion (21) of the base member (20).

[0073] When the insertion of the sealing unit (50) into the above mounting portion (21) is completed, the fastening bolts (61) (62) of the fastening portion (60) are tightened to move the first and second pressurizing members (51) (55) toward the sealing member (58), respectively, so that the sealing member (58) and the tightening holder (70) are pressurized.

[0074] In this way, as shown in Fig. 7, the compressed first sealing member (58) is deformed so that the outer surface thereof is in close contact with the inner surface of the mounting portion (21), and at the same time, the inner surface of the third insertion hole (59) of the first sealing member (58) is in close contact with the outer surface of the micro cable duct (200) equipped with the optical fiber.

[0075] In addition, the tightening holder (70) is brought into close contact with the second pressure member (55), and the gripping pieces (73) formed around the gripping hole (71) are pressed into the second insertion hole (56) to close contact with the outer surface of the micro duct (200), thereby gripping it. Accordingly, it is possible to prevent the micro cable duct (200) from being separated from the micro cable duct sealing unit (50) by an external force acting in the longitudinal direction.

[0076] The adhesion between the inner surface of the above-mentioned mounting portion (21) and the outer surface of the above-mentioned micro cable duct (200) and the first sealing member (58) increases as the transfer pressure of the first and second pressurizing members (51) (55) by the fastening portion (60) increases.

[0077] And the installation of the optical cable sealing unit (80) to maintain airtightness according to the introduction and withdrawal of the optical cable (300) into the mounting portion (21) or at least one mounting portion located in the center of the base member (20) of the optical cable connection box (10) is performed as follows.

[0078] In order to install the optical cable sealing unit (80) in the above-mentioned mounting portion (21), a third pressure member (90) in which the first and second unit pressure members (93) (94) are combined, a fourth pressure member (130) in which the third and fourth unit pressure members (133) (134) are combined, and a second sealing member (110) positioned between them are temporarily assembled using a fastening member (140).

[0079] In this state, as shown in Fig. 8, an optical cable (300) for connection is inserted through the second cable insertion holes (131) of the fourth pressure member (130), the cable holding hole (111) of the sealing member (110), and the first cable insertion hole (91).

[0080] The insertion of the optical cable (300) is not limited to the above-described embodiment, and the third pressure member (90), the second sealing member (110), and the fourth pressure member (130) can be performed independently, and the third pressure member (90) and the fourth pressure member (130) can be performed in a state where the first and second unit pressure members (93)(94) and the third and fourth unit pressure members (133)(134) are separated.

[0081] At this time, the combination of the first and second unit pressure members (93) (94) forming the third pressure member (90) is achieved by combining the first protrusion (103) with the second protrusion support member (105) and the second protrusion (107) with the first protrusion support member (101). The ends of the first and second protrusions (103) (107) are formed in a cylindrical shape so that they are inserted into the first and second protrusion support members (101) (105) and prevented from being detached, thereby increasing the combination support force.

[0082] And the combination of the third and fourth unit pressure members (133) (134) forming the fourth pressure member (130) is achieved by the third protrusion (123) being combined with the fourth protrusion support member (125) and the fourth protrusion (127) being combined with the third protrusion support member (121).

[0083] As described above, the optical cable sealing units (80) coupled with the optical cables (300) are inserted into each mounting portion (21). At this time, the insertion limiting protrusion (137) is made to be in close contact with the edge of the mounting portion (21) of the base member (20). When the insertion of the optical cable sealing unit (80) into the mounting portion (21) is completed, the fastening bolts (141) and (142) of the fastening portion (140) are tightened so that the third and fourth pressurizing members (90) and (130) are moved toward the second sealing member (110), respectively, so that the second sealing member (110) is pressed.

[0084] In this way, as shown in Fig. 8, the second sealing member (110) that is compressed is deformed so that the outer surface thereof is in close contact with the inner surface of the mounting portion (21), and at the same time, the inner surface of the cable grip hole (111) of the second sealing member (110) is in close contact with the outer surface of the inserted optical cable (300).

[0085] The adhesion between the inner surface of the mounting portion (21) and the outer surface of the optical cable (300) and the second sealing member (110) increases as the transfer pressure of the third and fourth pressurizing members (90) (130) by the fastening portion (140) increases.

[0086] When the fixing of the optical cable sealing unit (80) is completed as described above, the tension line of the optical cable (300) is fixed using the cable fixing unit (160).

[0087] In this state, when the optical cable (300) is pulled from the outside by an external force, the optical cable (300) is fixed to the optical cable sealing unit (80) by the cable fixing unit (160) and the auxiliary cable fixing unit (150) installed in the sealing unit (80), and the second sealing member (110) of the optical cable sealing unit (80) is supported by the anti-detachment protrusion formed on the inner surface of the mounting portion (21) when deformed, so that the detachment of the optical cable and the detachment of the optical cable sealing unit (80) are prevented.

[0088] And, although not shown in the drawing, if the diameter of the optical cable (300) is smaller than the diameter of the cable grip holes (111) formed in the optical cable sealing unit (80), the auxiliary sealing member is inserted into the cable grip holes (111) while supporting the optical cables (300) in the auxiliary cable grip holes of the auxiliary sealing member.

[0089] And as described above, the third and fourth pressurizing members (61) (71) are pressed by the second sealing member (110) using the fastening bolts of the fastening part. In this way, as the second sealing member (110) is deformed, its outer surface is brought into close contact with the inner surface of the mounting part (21), and the cable grip hole (111) portion of the sealing member (110) is brought into close contact with the outer surface of the auxiliary sealing member and is pressed. And the inner surface side of the auxiliary cable grip hole of the auxiliary sealing member is brought into close contact with the outer surface of the optical cable (300) to maintain airtightness.

[0090] As described above, the optical cable sealing unit (80) can seal and maintain airtightness of optical cables of various diameters, i.e., those having a diameter smaller than the diameter of the cable sealing hole (111).

[0091] As described above, the optical cable connection box according to the present invention can increase the airtightness of the microcable duct or optical cable when it is introduced or withdrawn into a partitioned space inside, and can prevent the connection part from being damaged by external force.

[0092] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. A support frame on which connection trays for connecting optical cables are installed, and a base member that supports the support frame and has multiple mounting portions through which cables are introduced and discharged; A cover member combined with the above base member to wrap the above support frame and maintain airtightness, An optical cable connection box having a micro cable duct sealing unit, characterized in that it is equipped with a micro cable duct sealing unit that is connected to the mounting portion of the above base member to wrap the micro cable ducts and secure them while maintaining an airtight seal with the outside.

2. In paragraph 1, The above micro cable duct sealing unit is an optical cable connection box having a micro cable duct sealing unit, characterized in that it comprises a first pressure member having a shape substantially identical to a shape of a hollow portion of a mounting portion and having a plurality of first insertion holes formed therein, a second pressure member having a plurality of second insertion holes formed coaxially with the first insertion holes, a first sealing member which is installed between the first and second pressure members and has a plurality of third insertion holes formed coaxially with the first and second insertion holes formed in the first and second pressure members, and whose shape is deformed by the pressure applied by the first and second pressure members so that the outer surface of the micro cable duct inserted into the first, second, and third insertion holes can be brought into close contact with the inner surface of the hollow portion of the mounting portion, and a fastening member which causes the first and second pressure members to close in a direction corresponding to each other to deform the first sealing member.

3. In paragraph 1, A tightening holder for holding the micro cable duct is further provided between the first sealing member and the second pressurizing member. An optical cable connection box having a micro cable duct sealing unit, characterized in that the clamping holder has a holder body in which gripping holes are formed on a side corresponding to the second insertion hole formed in the first pressurizing member, and at least two gripping pieces are formed on the edge of each gripping hole for gripping the micro cable duct by a bonding force combined with the second insertion hole.

4. In paragraph 1, An optical cable connection box having a micro cable duct sealing unit, characterized in that it further comprises an optical cable sealing unit installed on at least one of the mounting brackets formed on the base member to wrap around the outer surface of the cable and secure it to maintain airtightness from the outside.

5. In paragraph 4, The above optical cable sealing unit is inserted into the mounting portion of the base member, and includes a third pressurizing member having a first coupling portion for maintaining a mutually coupled state and first and second unit pressurizing members forming at least one first cable insertion port; A fourth pressurizing member including third and fourth unit pressurizing members having a second connecting portion for maintaining a mutually coupled state and forming at least one second cable insertion port; A second sealing member interposed between the third and fourth pressurizing members and having a cable holding hole corresponding to the first and second cable insertion holes, An optical cable connection box having a micro cable duct sealing unit characterized by having a fastening member that presses the third and fourth pressurizing members toward the mutual sealing member so that the sealing member is deformed and thus comes into close contact with the outer surface of the cable and the inner surface of the fixing member.

6. In paragraph 5, The first connecting portion has a first protrusion support portion formed by being introduced from the lower surface of the first unit pressing member and a first connecting projection extending from the side surface of the first unit pressing member, and a second protrusion support portion formed by being introduced from the lower surface of the second unit pressing member and a second connecting projection extending from the side surface of the second unit pressing member. An optical cable connection box having a micro cable duct sealing unit, characterized in that the second connecting portion has a third protrusion support portion formed by being introduced from the lower surface of the third unit pressing member, a third connecting projection extending from the side surface of the third unit pressing member, and a fourth protrusion support portion formed by being introduced from the lower surface of the fourth unit pressing member, and a fourth connecting projection extending from the side surface of the fourth unit pressing member.

7. In paragraph 6, The first protrusion support portion formed on the first unit pressure member is formed by forming a first support hole having a predetermined diameter from the upper surface of the first unit pressure member, and forming a first guide portion that is formed from the first support hole in the direction of the second unit pressure member and is opened with a width smaller than the diameter of the first support hole. The above first coupling projection has a first extension portion extending from the first unit pressure member toward the second unit pressure member, and a first engaging portion formed at an end of the first extension portion and having a first through hole formed therein. The second protrusion support portion formed on the second unit pressure member is formed by forming a second support hole having a predetermined diameter from the lower surface of the second unit pressure member, and forming a second guide portion that is formed from the second support hole in the direction of the first upper connecting member and is opened to a width smaller than the diameter of the second support hole. An optical cable connection box having a micro cable duct sealing unit, characterized in that it has a second extension portion coupled with the first guide portion of the second coupling protrusion and a second catch portion formed at an end of the second extension portion and having a second through hole formed therein.

8. In paragraph 5, An optical cable connection box having a micro cable duct sealing unit, characterized in that the second sealing member is made of soft synthetic resin or rubber, a cable holding hole is formed to correspond to the first and second cable support holes, and the optical cable holding hole is cut in the width direction so that it can be opened.

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