# US 2025/0146602 A1 · Pipe connection device for repairs > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0146602 A1 - Document ID: US20250146602A1 - Status: Published application - Kind: A1 - Application number: 18/502,247 - Filed: 2023-11-06 - Published: 2025-05-08 - Earliest claimed: 2023-11-06 - Inventors: Ho Gun CHUNG - Web page: https://patentgrep.com/patent/US20250146602A1 ## CPC - F16L 21/002: {Sleeves or nipples for pipes of the same diameter; Reduction pieces (F16L27/00, F16L37/00 take precedence; with elastic sealing rings F16L21/022)} - F16L 21/035: placed around the spigot end before connection ({F16L21/022,} F16L21/025 take precedence) - F16L 55/1608: {by replacement of the damaged part of the pipe} - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL ## Abstract Disclosed is a pipe connection device for repairs that connects first and second pipes by extending a length of inner and outer connection pipes, wherein the first and second pipes are connected using the inner and outer connection pipes in a state in which the inner and outer connection pipes are fixed while extended to be proportional to a length between the first and second pipes by a detachment preventing protrusion being caught in and fixed to a detachment preventing groove while an inner catching step is caught on an outer catching step to limit sliding. ## Claims ### Claim 1 A pipe connection device for repairs, the pipe connection device comprising: an inner connection pipe (100), which has a hollow shape whose front and rear portions are open and has a connection pipe (101) formed at one end in order to be inserted into a first pipe (P1) cut to have a predetermined length, a detachment preventing groove (101a) formed to be recessed along an outer surface of the connection pipe (101), and a pipe expanding part (102) formed to expand at a rear end of the connection pipe (101) and forming an outer catching step (102a) between the connection pipe (101) and the pipe expanding part (102); and an outer connection pipe (200), which has a hollow shape whose front and rear portions are open, is inserted and coupled to surround an outer surface of the inner connection pipe (100), and has a detachment preventing protrusion (202) formed to protrude along an inner circumferential surface of one end to correspond to the detachment preventing groove (101a) and be caught in and fixed to the detachment preventing groove (101a), the other end fastened to surround an outer surface of a second pipe (P2), which is cut and faces the first pipe (P1), to connect the inner connection pipe (100) and the second pipe (P2), and an inner catching step (201) formed on an inner circumferential surface in order to be caught on the outer catching step (102a) and prevent the inner connection pipe (100) from being inserted to a predetermined depth or more into the outer connection pipe (200). ### Claim 2 (depends on 1) The pipe connection device of claim 1, wherein: the detachment preventing groove (101a) of the inner connection pipe (100) is formed as a plurality of detachment preventing grooves (101a) spaced apart at predetermined intervals in a longitudinal direction of the outer surface of the inner connection pipe (100); and the detachment preventing protrusion (202) of the outer connection pipe (200) is formed as a plurality of detachment preventing protrusions (202) that are proportional to the number of detachment preventing grooves (101a), spaced apart at predetermined intervals, and caught in the detachment preventing grooves (101a). ### Claim 3 (depends on 1) The pipe connection device of claim 1, wherein the detachment preventing groove (101a) is formed to be recessed in a polygonal shape to allow the detachment preventing protrusion (202) to be inserted thereinto and prevent the detachment preventing protrusion (202) from being detached. ### Claim 4 (depends on 2) The pipe connection device of claim 2, wherein the detachment preventing groove (101a) is formed to be recessed in a polygonal shape to allow the detachment preventing protrusion (202) to be inserted thereinto and prevent the detachment preventing protrusion (202) from being detached. ### Claim 5 (depends on 1) The pipe connection device of claim 1, wherein the outer connection pipe (200) further includes a limiting step part (203) configured to force the other end of the pipe expanding part (102) of the inner connection pipe (100) to be caught on a rear end of the inner catching step (201) to block the inner connection pipe (100) from moving backward toward the other end of the outer connection pipe (200). ### Claim 6 (depends on 5) The pipe connection device of claim 5, wherein the limiting step part (203) further includes: an inclined surface portion (203a) formed to extend to be inclined downward from the inner circumferential surface of the outer connection pipe (200) toward a central portion thereof to guide the pipe expanding part (102) of the inner connection pipe (100) to move over the inclined surface portion (203a); and a perpendicular surface portion (203b) formed to be perpendicular from a tip of the inclined surface portion (203a) toward the inner circumferential surface of the outer connection pipe (200) to cause the other end of the pipe expanding part (102) of the inner connection pipe (100) to come in close contact with and be caught on the perpendicular surface portion (203b). ### Claim 7 (depends on 1) The pipe connection device of claim 1, wherein the outer connection pipe (200) further includes an insertion limiting step (204) formed to be recessed from an inner circumferential surface of a rear end toward an outer circumferential surface thereof and allow the second pipe (P2) to be caught thereon to limit a depth to which the outer connection pipe (200) is inserted toward the second pipe (P2). ### Claim 8 (depends on 1) The pipe connection device of claim 1, wherein: the inner connection pipe (100) has a first O-ring (301) formed in a gap between the connection pipe (101) and the first pipe (P1) to prevent a fluid from leaking through the gap between the first pipe (P1) and the connection pipe (101); and the outer connection pipe (200) has a first O-ring (301) formed in a gap with the second pipe (P2) to prevent the fluid from leaking through the gap with the second pipe (P2). ### Claim 9 (depends on 1) The pipe connection device of any one of claim 1, wherein a second O-ring (302) is installed in a gap between the outer connection pipe (200) and the connection pipe (101) of the inner connection pipe (100) and a gap between the outer connection pipe (200) and the pipe expanding part (102) of the inner connection pipe (100) to prevent the fluid from leaking through the gaps between the inner and outer connection pipes (100, 200). ### Claim 10 (depends on 8) The pipe connection device of any one of claim 8, wherein a second O-ring (302) is installed in a gap between the outer connection pipe (200) and the connection pipe (101) of the inner connection pipe (100) and a gap between the outer connection pipe (200) and the pipe expanding part (102) of the inner connection pipe (100) to prevent the fluid from leaking through the gaps between the inner and outer connection pipes (100, 200). ### Claim 11 (depends on 1) The pipe connection device of claim 1, wherein the inner connection pipe (100) further includes an adapter (103), which has a hollow shape whose front and rear portions are open and has one end inserted and fastened to surround an outer surface of the first pipe (P1) and the other end into which one end of the connection pipe (101) is allowed to be inserted and fastened to connect the first pipe (P1) and the connection pipe (101).