WO2010035924A1

WO2010035924A1 - Pipe sub-connector and pipe connector therewith

Info

Publication number: WO2010035924A1
Application number: PCT/KR2008/007882
Authority: WO
Inventors: Sam Soo Han
Original assignee: Samil Axon Co., Ltd.
Priority date: 2008-09-23
Filing date: 2008-12-31
Publication date: 2010-04-01
Also published as: KR20100034172A

Abstract

The present invention relates to a pipe sub-connector and a pipe connector therewith, characterized by: a body (410) hinged at each end of a pair of circular metal plates; and a saw-tooth (420) formed along an inner circumferential surface of the body, wherein the pipe sub-connector (400) is arranged at both ends of a rubber sleeve into which each end of a pipe (P) is inserted, the pipe sub-connector is attachably and detachably installed at both inner circumferential surfaces of a coupling wrapping an outer periphery of the rubber sleeve, and the outer periphery of the pipe is compressed by the saw-tooth by means of compression of the coupling in response to operation of a fastening unit fastening the pipe to thereby prevent the pipe from being moved.

Description

PIPE SUB-CONNECTOR AND PIPE CONNECTOR

THEREWITH

Technical Field

[1] The present invention relates to a pipe sub-connector and a pipe connector therewith.

More particularly, the invention relates to a pipe sub-connector and a pipe connector including the pipe-sub connector capable of preventing pipes connected by pipe connectors from being separated by an internal force generated by friction resistance of fluid or unexpected external force. Background Art

[2] A pipe is a long hollow tubular article utilized for transfer of fluid, and a path of fluid comprised by the pipe is called a pipeline or a conduit line. At this time, a term of piping or piping arrangement is used where a pipeline is reasonably installed in consideration of liquid quantity, property values and friction resistance. Particularly, the piping plays an important role in determining a transfer efficiency of liquid, such that connecting two ends of a pipe is the most fundamental affair in the piping.

[3]

[4] There are many known methods of connecting pipes according to ambient environments in which fluid is transported, the methods of which may include, for example, a welding method in which both ends of a pipe are joined and welded, a flange method in which both ends of a pipe are respectively formed with flanges and fixed using a bolt and a nut, and a coupling method in which both ends of a pipe are joined using a coupling.

[5]

[6] Among these methods, the flange method is widely and advantageously used to connection of pipes made of materials where welding is difficult in applying, and to connection of pipes where flanges are not formed. However, the flange method suffers from disadvantages of the connected pipes being separated from couplings due to friction resistance of mobile fluid that is transported. Various technologies have been proposed to solve the disadvantages.

[7]

[8] Now, the conventional pipe connector according to the coupling method will be described with reference to the attached drawings.

[9]

[10] FIG.1 is a perspective view illustrating the conventional pipe connector, and FIG.2 is an exploded perspective view illustrating the conventional pipe connector. [H]

[12] Referring to FIGS. 1 and 2, the conventional pipe connector may include a rubber sleeve (100) into which a pipe is inserted, a coupling (200) encompassing an outer circumferential surface of the rubber sleeve (100), and a fastening unit (300) fastening the pipe by tightening up the coupling (200).

[13]

[14] In a case the fastening unit (300) tightens up the coupling (200), the rubber sleeve

(100) is compressed between the coupling (200) and the pipe. If the rubber sleeve (100) is compressed between the coupling (200) and the pipe, the connected pipes are not easily separated by the friction resistance of the fluid transported by the pipes even if the pipes are moved, and a space or a gap formed between the pipe and the coupling (200) is filled up by the rubber sleeve (100) to disable the fluid from being leaked.

[15]

[16] However, the rubber sleeve (100) has a limit in preventing the connected pipes from being separated when the connected pipes are compressed only by the rubber sleeve (100) because the rubber sleeve (100) has a predetermined size of elasticity even if rubber sleeve (100) is compressed to the connected pipes. That is, it is preferable that the rubber sleeve (100) be made of rubber in order to prevent the fluid from leaking from between the pipes and the coupling (200). However, there is still a disadvantage of the pipes being separated due to characteristic limit in low friction factor of the rubber in a case where a friction resistance of the transported fluid abruptly increases or an unexpected external force is applied to the pipes. Disclosure of Invention

Technical Problem

[17] Although the conventional pipe connector can prevent the fluid from leaking between the pipes and the coupling by installing a rubber sleeve between couplings connecting a pipe and a pipe, there is still a disadvantage in that the pipe fixing alone by compressing the rubber sleeve cannot effectively prevent the pipes from being separated when a friction resistance of the transported fluid abruptly increases or an unexpected external force is applied to the pipes.

[18]

[19] The present invention has been made to address or to alleviate the above-described drawbacks occurring in the prior art. Accordingly, it is an object of the present invention to provide a pipe sub-connector and a pipe connector therewith that can be utilized for preventing liquid from leaking from pipes and couplings, and preventing the pipes from being separated due to movement of pipes even if a friction resistance of transported liquid abruptly increases or an unexpected great external force is applied to the pipes. Technical Solution

[20] In one general aspect, a pipe sub-connector is characterized by: a body hinged at each end of a pair of circular metal plates; and a saw-tooth formed along an inner circumferential surface of the body, wherein the pipe sub-connector is arranged at both ends of a rubber sleeve into which each end of a pipe is inserted, the pipe sub-connector is attachably and detachably installed at both inner circumferential surfaces of a coupling wrapping an outer periphery of the rubber sleeve, and the outer periphery of the pipe is compressed by the saw-tooth by means of compression of the coupling in response to operation of a fastening unit fastening the pipe to thereby prevent the pipe from being moved.

[21]

[22] In some exemplary embodiments, the pipe sub-connector further includes a rubber member that is to be installed at an outer periphery of the body.

[23]

[24] In some exemplary embodiments, the saw-tooth comprise plural saw-teeth, each sawtooth having a pitch distance distanced at a predetermined space apart, and a line direction formed by the saw-tooth being vertically formed from an insertion direction of the pipe.

[25]

[26] In another general aspect, a pipe connector connecting both ends of two pipes, the pipe connector including a pipe sub-connector, is characterized by: a cylindrical rubber sleeve having openings at both ends into which each end of the pipe is inserted; a pipe sub-connector including a body hinged at each end of a pair of circular metal plates and a saw-tooth formed along an inner circumferential surface of the body, the pipe sub-connector being arranged at both ends of the rubber sleeve; a circular coupling wrapping the rubber sleeve and the pipe sub-connector and lengthwise opened at one side thereof; and a fastening unit coupled to an outer periphery of the coupling to fasten the pipe by compressing the rubber sleeve and the pipe sub-connector into which the pipe is inserted, by compressing a gap between both cut-outs of the coupling, wherein the pipe is not moved by pressure of the rubber sleeve and the sawtooth of the pipe sub-connector on the outer periphery of the pipe by means of the compression of the coupling in response of the operation of the fastening unit.

[27]

[28] In some exemplary embodiments, the rubber sleeve of the pipe connector is formed at an inner circumferential surface with fixation protruders each spaced at a predetermined distance apart. [29] [30] In some exemplary embodiments, the pipe connector is installed across the coupling with sills for preventing the supportively fixed pipe sub-connector from being disengaged.

[31]

[32] In some exemplary embodiments, the fastening unit of the pipe connector includes a fastening rod fixation unit coupled at two upper cut-out surfaces of the coupling, formed with insertion holes lengthwise of the coupling and formed with a pair of fastening holes that penetrate each lateral surface, a fastening rod provided with a pair of female screws communicating with the fastening holes, and a pair of fastening bolts each screwed into the female screws to compress a gap between two cut-out surfaces.

Advantageous Effects

[33] The advantageous effect of the pipe sub-connector and pipe connector therewith thus configured according to the present invention is that liquid is prevented from leaking from a gap between the pipe and the coupling, using the rubber sleeve, and pipes are concurrently prevented from being easily separated by an internal force generated by friction resistance of transported fluid in the pipes or an unexpected large external force.

[34]

[35] Meanwhile, the pipe sub-connector is also advantageous in that it can be arranged at both ends of the rubber sleeve, and attachably and detachably installed at both inner circumferential surfaces of the coupling, thereby dispensing with a new pipe connector equipped with a pipe sub-connector to allow being fixed at the conventional pipe sub- connector.

[36]

[37] Another advantage is that a body constituting the pipe sub-connector is hinged by each end of a pair of circular plate such that even if a diameter of the pipe is greater than that of the pipe sub-connector fixing the pipe, the pipe sub-connector can be applied to any size of pipe unless the diameter of the pipe is small. Brief Description of Drawings

[38] FIG.1 is a perspective view of the conventional pipe connector.

[39] FIG.2 is an exploded perspective view of the conventional pipe connector.

[40] FIG.3 is a perspective view of a pipe connector according to the present invention.

[41] FIG.4 is an exploded perspective view of a pipe connector according to the present invention.

[42] FIG.5 is a perspective view of a pipe connector according to an exemplary embodiment of the present invention. [43] FIG.6 is an exploded perspective view of a pipe connector according to an exemplary embodiment of the present invention.

[44] FIG.7 is a perspective view of a pipe sub-connector used for a pipe connector according to the present invention.

[45] FIG.8 is a cross-sectional view in which pipes are connected by the pipe connector according to the present invention.

[46] FIG.9 is an exploded cross-sectional view before a fastening unit of a pipe connector is operated according to the present invention.

[47] FIG.10 is a partial exploded cross-sectional view after a fastening unit of a pipe connector is operated according to the present invention.

[48]

[49] ***** Description of principal elements in the drawings *****

[50] P: Pipe 100: Rubber sleeve

[51] 110: Fixation protrusions 200: Coupling

[52] 210: Sills 300: Fastening unit

[53] 310: Fastening rod fixation unit 320: Fastening rod

[54] 330: Fastening bolt 340: Band

[55] 350: Fastener 360: Fastening bolt

[56] 400: Pipe sub-connector 410: Body

[57] 420: Saw-tooth 421 : Corner

Best Mode for Carrying out the Invention

[58] The pipe sub-connector and a pipe therewith according to the present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. First of all, it will be understood that sizes or shapes of constituent elements may have been exaggerated for clarity and explanation of the description. Furthermore, terms and phrases used in the specification and claims may be interpreted or vary in consideration of construction and use of the present invention according to intentions of an operator or customary usages. The terms and phrases therefore should be defined based on the contents across an entire specification.

[59]

[60] FIG.3 is a perspective view illustrating a pipe connector according to the present invention, FIG.4 is an exploded perspective view illustrating a pipe connector according to the present invention, FIG.5 is a perspective view of a pipe connector according to an exemplary embodiment of the present invention, FIG.6 is an exploded perspective view of a pipe connector according to an exemplary embodiment of the present invention, and FIG.7 is a perspective view of a pipe sub-connector used for a pipe connector according to the present invention.

[61]

[62] Referring to FIGS.3 and 4, the pipe connector according to the present invention largely includes a rubber sleeve (100), a coupling (200), a fastening unit (300) and a pipe sub-connector (400).

[63]

[64] The rubber sleeve (100) is a rubber compressed between the coupling (200) and the pipe (P. see FIG.8). The rubber sleeve (200) serves to prevent the connected pipe (P) from being separated, and also prevent the liquid from leaking into the pipe (P) and the coupling (200). The rubber sleeve (100) has an open cylindrical shape such that each end of the pipe (P) can be inserted thereinto. Generally, the pipe (P) is formed of a cylindrical shape in consideration of pressure applied to the pipe (P) itself, such that in order for the pipe (P) to be insertedly abutted to the rubber sleeve (100), it is preferable that the rubber sleeve (100) be also formed of a cylindrical shape like that of the pipe

(P).

[65]

[66] Furthermore, the rubber sleeve (100) is formed at an inner circumferential surface with protrusive fixation protrusions (110) each distanced apart at a predetermined space.

[67]

[68] The fixation protrusions (110) are protrusively formed along a circumferential direction of the rubber sleeve (100) which is a right angle to a direction in which the connected pipe (P) can be separated from the rubber sleeve (100). The protrusively formed space of each fixation protrusion (110) may vary according to size and installation environment of the connected pipe (P). The cross-section of the protrusively formed fixation protrusion (110) may take any shape such as a triangular shape or an oval shape. Preferably, the cross-section of the fixation protrusion (110) is of a rectangle in order to increase friction with the pipe (P) when the connected pipe (P) is applied with pressure.

[69]

[70] Meanwhile, the coupling (200) is cylindrically formed to encompass the periphery of the rubber sleeve (100). The coupling (200) protects the periphery of the rubber sleeve (100) and compresses the rubber sleeve (100) as well when the fastening unit (300) is fastened. The coupling (200) is lengthwise cut at one side thereof to enable a full wrap of the rubber sleeve (100) even if a diameter of the rubber sleeve (100) is unexpectedly larger.

[71]

[72] Furthermore, across the coupling (200) there may be further included with sills (210) for preventing the supportively fixed pipe sub-connector (400) from being disengaged.

[73]

[74] That is, as described later, the pipe sub-connector (400) is attachably and detachably installed at both inner circumferential surfaces of the coupling (200) to allow the pipe sub-connector (400) to be disengaged along with the pipe (P) when the pipe (P) is disengaged. In order to prevent the pipe sub-connector (400) from being disengaged, both ends of the coupling (200), the sills (210) may be further installed.

[75]

[76] Meanwhile, the fastening unit (300) is coupled to a periphery of the coupling (200) to tighten up a gap between both cut-out surfaces of the coupling (200), whereby the rubber sleeve (100) is compressed.

[77]

[78] In one exemplary embodiment of the fastening unit (300), the fastening unit (300) may largely include a fastening rod fixation unit (310), a fastening rod (320) and a fastening bolt (330).

[79]

[80] The fastening rod fixation unit (310) serves to secure the fastening rod (320. described later) at both cut upper ends of the coupling (200). The fastening rod fixation unit (310) is coupled to both cut upper ends of the coupling (200) and is mounted with an insert hole (311) formed lengthwise of the coupling (200). The fastening rod fixation unit (310) may be coupled to both cut-out upper ends of the coupling (200) using a joining method such as welding or riveting. The fastening rod fixation unit (310) is mounted with a pair of fastening holes (312) each piercing a lateral surface of the coupling (200). The insert hole (310) is a space into which the fastening rod (320) is fixedly inserted. The fastening holes (312) function as a passage through which the fastening bolt (330. described later) is screwed into a female screw (321) mounted at the fastening rod (320).

[81]

[82] The fastening rod (320) is mounted with a female screw (321) communicating with each fastening hole (312). The female screw (321) is inserted and screwed by the fastening bolt (330. described later) to tighten up the gap between both cut surfaces. Each of the fastening rods (320) is inserted into the insert hole (311) to be secured at both upper cut upper ends of the coupling (200).

[83]

[84] The fastening bolt (330) comes in a pair, each being screwed into the female screw

(321) to tighten up the gap between both cut surfaces of the coupling (200). In a case the gap between both cut surfaces of the coupling (200) is tightened up, the rubber sleeve (100) into which the pipe (P) is inserted is pressurized to fasten the pipe (P). That is, the fastening unit (300) serves to tighten up the coupling (200) by screwing force of the female screw (321) and the fastening bolt (330).

[85]

[86] Meanwhile, in another exemplary embodiment of the fastening unit (300), the fastening rod (320) may be directly coupled to both cut upper surfaces of the coupling (200) instead of installing the fastening rod fixation unit (310) on both cut upper surfaces of the coupling (200). The configuration of the fastening unit (300) may be simplified by said another exemplary embodiment of the fastening unit (300). That is, the fastening rod (320) is welded to both cut upper surfaces of the coupling (200), and the fastening bolt (330) is screwed to the female screw (321) provided at the lateral surface of the fastening rod (20) to tighten up the gap between both cut surfaces of the coupling (200).

[87]

[88] Meanwhile, in still another exemplary embodiment of the fastening unit (300), the fastening unit (300) may largely include a band (340), a fastener (350) and a fastening bolt (360).

[89]

[90] The band (340) is wrapped around the periphery of the coupling (200), being longer than a circular length of the coupling (200) to fully tighten up the coupling (200) regardless of the thickness of the rubber sleeve (100). The band (340) is coupled at one end thereof to the periphery of the coupling (200) while the other end of the band (340) is mounted with slits (341) each continuously formed as long as a predetermined length to the lengthwise direction of the band (340) to be piercingly inserted into the fastener (350. described later).

[91]

[92] The fastener (350) formed at an inner surface thereof with female screws (not shown) is mounted at one end of the band (340). The female screw (not shown) is inserted by the other end of the band (340) formed with slits (341) along with the fastening bolt (360).

[93]

[94] The fastening bolt (360) goes through the slits (341) to be screwed to the female screw (not shown). Preferably, the fastening bolt (360) goes through the slits (341) which are far distanced from a distal end of the band (340) for firmly tightening up the coupling (200). The band (340), the fastener (350) and the fastening bolt (360) may be in plural numbers in consideration of the length of the coupling (200) if the coupling is lengthy.

[95]

[96] Now, referring to FIG.7, the pipe sub-connector (400) is largely composed of a body (410), a saw-tooth (420) and a rubber member (430).

[97]

[98] The body (410) is formed by each end of a pair of circular plates, the each end being hinged. The curvature of the circular plate is preferably the same as that of pipe (P). However, if the curvature of the plates disaccords with that of the pipe (P), the plates are preferably made of a ductile member, or the plates are respectively rotated about a hinge axel arranged at each end to thereby allow the plates to adjust a mutually- uncoupled gap between respective other ends.

[99]

[100] The saw-tooth (420) is formed along an inner circumferential surface of the body (410). The saw-tooth (420) compresses an outer surface of the pipe (P) to prevent the pipe (P) from being moved when the coupling (200) is fastened. At this time, the sawtooth may comprise plural saw-teeth each saw-tooth spaced at a predetermined distance apart along the inner circumferential surface of the body (410). Particularly, the number and space of saw-teeth are preferably adjusted in consideration of type of fluid transported along the pipe (P) and an area on which the pipe (P) is installed.

[101]

[102] That is, if the fluid being transported is the one having a great friction resistance or an area where pipes are installed is the one which tends to receive a large external shock, the number of saw-teeth (420) is preferably increased to narrow the mutual space.

[103]

[104] Furthermore, the saw-tooth (420) is formed to have a pitch distance of a predetermined space, and a direction o a line formed by a corner (421) of the saw-tooth (420) is made to be perpendicular to an insertion direction of the pipe (P), whereby the pipe (P) is not moved any more.

[105]

[106] The rubber member (430) is formed at an outer periphery of the body (410) to allow the body (410) to abut against the coupling (200). Therefore, the rubber member (430) is further able to transfer to the saw-tooth (420) the pressure that is applied when the coupling (200) is fastened by the operation of the coupling unit (300). Thus, the sawtooth (420) can further compress the outer periphery of the pipe (P) via the rubber member (430) to ultimately compress the outer periphery of the pipe (P) much more stronger, whereby the pipe sub-connector (400) is prevented from being disengaged from the coupling (200) by the motion of the pipes (P).

[107]

[108] The pipe sub-connector (400) thus configured is installed at both ends of the rubber sleeve (100), and attachably and detachably installed at both inner circumferential surfaces of the coupling (200). Thus, as the coupling (200) is fastened by the operation of the fastening unit (300), the saw-tooth (420) compresses the outer periphery of the pipe (P), whereby the pipe (P) is prevented from being disengaged and is fixed firmly.

[109]

[110] At this time, in a case where the material of the pipe (P) has a less hardness than that of the saw-tooth (420) such as PVC, the saw-tooth (420) is partially buried in the periphery of the pipe (P) to prevent the pipe (P) from moving and to fix the pipe (P). However, in a case where the material of the pipe (P) has a higher hardness than that of the saw-tooth (420), the saw-tooth (420) is not buried in the periphery of the pipe (P), but increases the friction resistance with the periphery of the pipe (P) to prevent the pipe (P) from moving and to fix the pipe (P). Mode for the Invention

[111] Now, operation of both ends of a pipe being connected by the pipe sub-connector and the pipe connector therewith according to the present invention will be described in detail with reference to FIGS.8 to 10.

[112]

[113] FIG.8 is a cross-sectional view in which pipes are connected by the pipe connector according to the present invention, FIG.9 is an exploded cross-sectional view before a fastening unit of a pipe connector is operated according to the present invention, and FIG.10 is a partial exploded cross-sectional view after a fastening unit of a pipe connector is operated according to the present invention.

[114]

[115] Referring to FIG.8, each end of the pipe (P) is inserted into the rubber sleeve (100). At this time, because the gap between both cut-out surfaces of the coupling (200) is not larger than a diameter of the pipe (P), the pipe (P) should be gone through the coupling (200) before the pipe (P) is inserted into the rubber sleeve (100). Thereafter, the coupling (200) is positioned to wrap the periphery of the rubber sleeve (100), and then, both ends of the rubber sleeve (100), i.e., both inner circumferential surfaces of the coupling (200), is installed with the pipe sub-connector (400).

[116]

[117] In a case the rubber sleeve (100), the coupling (200) and the pipe sub-connector

(400) are provided about the pipe (P), the fastening unit (300) is utilized to fasten a gap between both cut-out surfaces of the coupling (200). Thus, because the gap between both cut-out surfaces of the coupling (200) is tightened up by using the fastening unit (300), the rubber sleeve (100) and the pipe sub-connector (400) into which the pipe (P) is inserted are compressed to prevent the pipe (P) from being moved and to allow the pipe (P) to be fixed. [119] Now, referring to FIGS. 9 and 10, the saw-tooth (420) comprising the pipe sub- connector (400) along with the rubber sleeve (100) is either buried into the outer periphery of the pipe (P) or compresses the outer periphery of the pipe (P) according to the material of the pipe (P), and the pipe (P) is prevented from moving and is instead fixed by the pipe sub-connector and the pipe connector. Industrial Applicability

[120] The industrial applicability of the pipe sub-connector and the pipe connector according to the present invention is that liquid is prevented from leaking from a gap between the pipe and the coupling, using the rubber sleeve, and pipes are concurrently prevented from being easily separated by an internal force generated by friction resistance of transported fluid in the pipes or an unexpected large external force. Another industrial applicability is that the pipe sub-connector can be arranged at both ends of the rubber sleeve, and attachably and detachably installed at both inner circumferential surfaces of the coupling, thereby dispensing with a new pipe connector equipped with a pipe sub-connector to allow being fixed at the conventional pipe sub-connector. Still another industrial applicability is that a body constituting the pipe sub-connector is hinged by each end of a pair of circular plate such that even if a diameter of the pipe is greater than that of the pipe sub-connector fixing the pipe, the pipe sub-connector can be applied to any size of pipe unless the diameter of the pipe is small.

[121]

[122] While the present invention is described herein with reference to illustrative embodiments for particular applications, it should be understood that the disclosure is not limited thereto. Those having ordinary skill in the art and access to the teachings provided herein will recognize additional modifications, applications and embodiments within the scope thereof and additional fields in which the present disclosure would be of significant utility.

Claims

[1] A pipe connector connecting both ends of two pipes characterized by: a cylindrical rubber sleeve (100) having openings at both ends into which each end of the pipe (P) is inserted; a pipe sub-connector(400) including a body hinged at each end of a pair of circular metal plates and a saw-tooth (420) formed along an inner circumferential surface of the body, the pipe sub-connector being arranged at both ends of the rubber sleeve; a circular coupling (200) wrapping the rubber sleeve and the pipe sub-connector and lengthwise opened at one side thereof; and a fastening unit (300) coupled to an outer periphery of the coupling to fasten the pipe by compressing the rubber sleeve and the pipe sub-connector into which the pipe is inserted, by compressing a gap between both cut-outs of the coupling, wherein the pipe is not moved by pressure of the rubber sleeve and the saw-tooth of the pipe sub-connector on the outer periphery of the pipe by means of the compression of the coupling in response of the operation of the fastening unit.

[2] The pipe connector of claim 1, characterized in that the pipe sub-connector (400) further includes a rubber member (430) installed on an outer periphery of the body.

[3] The pipe connector of claim 2, characterized in that the saw-tooth (420) includes plural saw-teeth, each saw-tooth having a pitch distance distanced at a predetermined space apart.

[4] The pipe connector of claim 2, characterized in that a line direction formed by a corner of the saw-tooth (420) is perpendicular to an insertion direction of the pipe (P).

[5] The pipe connector of claim 2, characterized in that the rubber sleeve (100) of the pipe connector is formed at an inner circumferential surface with fixation protruders each spaced at a predetermined distance apart.

[6] The pipe connector of claim 2, characterized in that sills (210) are formed across the coupling for preventing the supportively fixed pipe sub-connector from being disengaged.

[7] The pipe connector of claim 2, characterized in that the fastening unit (300) of the pipe connector comprises: a fastening rod fixation unit (310) coupled at two upper cut-out surfaces of the coupling, formed with insertion holes lengthwise of the coupling and formed with a pair of fastening holes that penetrate each lateral surface; a fastening rod (320) provided with a pair of female screws communicating with the fastening holes; and a pair of fastening bolts (330) each screwed into the female screws to compress a gap between two cut-out surfaces.

[8] The pipe connector of claim 2, characterized in that the fastening unit (300) of the pipe connector comprises: a fastening rod (320) provided lengthwise of the coupling at both upper cut-out surfaces of the coupling and formed with a pair of female screws; and a pair of fastening bolts (330) each screwed into the female screw to fasten a gap between the both cut-out surfaces of the coupling.

[9] The pipe connector of claim 2, characterized in that the fastening unit includes a band (340) wrapped around the periphery of the coupling (200), being longer than a circular length of the coupling (200) and coupled at one end thereof to the periphery of the coupling (200) while the other end of the band (340) is mounted with slits (341) each continuously formed as long as a predetermined length to the lengthwise direction of the band (340) to be piercingly inserted into the fastener (350), a fastener (350) formed at an inner surface thereof with female screws mounted at one end of the band (340) and inserted by the other end of the band (340), and a fastening bolt (360) going through the slits (341) to be screwed to the female screw.

[10] A pipe sub-connector, characterized by: a body (410) hinged at each end of a pair of circular metal plates; and a saw-tooth (420) formed along an inner circumferential surface of the body, wherein the pipe sub-connector (400) is arranged at both ends of a rubber sleeve (100) into which each end of a pipe (P) is inserted, the pipe sub-connector (400) is attachably and detachably installed at both inner circumferential surfaces of a coupling (200) wrapping an outer periphery of the rubber sleeve, and the outer periphery of the pipe is compressed by the saw-tooth (420) by means of compression of the coupling in response to operation of a fastening unit (300) fastening the pipe to thereby prevent the pipe from being moved.

[11] The pipe sub-connector of claim 10, characterized in that a rubber member (100) is formed at an outer periphery of the body (410).

[12] The pipe sub-connector of claim 10, characterized in that that the saw-tooth

(420) includes plural saw-teeth, each saw-tooth having a pitch distance distanced at a predetermined space apart.

[13] The pipe sub-connector of claim 10, characterized in that a line direction formed by a corner of the saw-tooth (420) is perpendicular to an insertion direction of the pipe (P).