# US 5,342,099 A · Fluid coupling with condition indicator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,342,099 A - Document ID: US5342099A - Status: Granted - Kind: A - Application number: 08/011,677 - Filed: 1993-02-01 - Granted: 1994-08-30 - Earliest claimed: 1992-02-25 - Assignees: Rasmussen GmbH - Inventors: Frank Bahner; Stephan Mann - Web page: https://patentgrep.com/patent/US5342099A ## CPC - F16L 37/133: using flexible hooks {(F16L37/1215 takes precedence)} - F16L 33/213: only a sleeve being expanded inside the hose - F16L 2201/10: Indicators for correct coupling - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL ## Abstract A coupling device which separably connects the end of a hose to the end of a pipe has a sleeve one end portion of which is connectable to the end of the hose and the other end portion of which has axially parallel resilient radially movable prongs serving to establish a form-locking connection with an external rib on the end of the pipe in response to insertion of the end of the pipe into the other end portion of the sleeve. A locking ring which is reciprocable on the sleeve between a retracted position and an operative position has axially parallel arms which overlie the prongs in the operative position of the ring. A C-shaped indicator of the condition of the form-locking connection has tongue-like male detent members which extend into sockets provided therefor in the prongs when the ring is held in the retracted position and the end of the pipe is not in form-locking engagement with the prongs of the sleeve. The detent members are expelled from their sockets in response to form-locking engagement between the pipe and the sleeve, and the indicator is thereupon displaced longitudinally of the sleeve in response to movement of the ring to its operative position. ## Claims ### Claim 1 A device for separably coupling an end of a first conduit with an end of a second conduit, comprising: a tubular connecting member having a first end portion engageable with the end of the first conduit and a second end portion separably engageable with the end of the second conduit; form-locking means on said second end portion for partly establishing a form-locking connecting between said tubular member and the second conduit upon movement of said tubular member and the end of the second conduit to predetermined positions relative to each other; a locking element movable relative to said tubular member between operative and inoperative positions, wherein said locking element terminates and prevents said form-locking connection; an indicator; and affixing means on said indicator for separably affixing said indicator to said tubular member; and displacement means on said locking element for displacing said indicator relative to said tubular member in response to movement of said locking element to said operative position. ### Claim 2 (depends on 1) The coupling device of claim 1, wherein said affixing means comprises at least one male detent and at least one complementary female detent, one of said male and female detents being provided on said indicator and the other of said male and female detents being provided on said second end portion. ### Claim 3 (depends on 2) The coupling device of claim 2, wherein said at least one female detent is provided on said second end portion, said displacing means including means for effecting a movement of said at least one male detent away from said at least one female detent in response to movement of said locking element to said operative position. ### Claim 4 (depends on 2) The coupling device of claim 2, wherein said tubular member is elongated and said form-locking means for partly establishing said form-locking connection comprises a plurality of resilient prongs extending substantially longitudinally and movable relative to each other substantially radially of said tubular member, said prongs engaging an annular external projection of the end of the second conduit in said predetermined positions of said second end portion of said tubular connecting member and the end of the second conduit relative to each other, said form-locking means for partly establishing said form-locking connection further having slots between said prongs, said at least one female detent being provided in one of said prongs and said at least one male detent comprising a portion extending into one of said slots to be displaced by said external projection and to thus expel said at least one male detent from said at least one female detent in response to movement of said tubular member and the end of the second conduit relative to each other to said predetermined positions. ### Claim 5 (depends on 4) The coupling device of claim 4, wherein each of said prongs has a female detent and said indicator comprises a male detent for each of said female detents. ### Claim 6 (depends on 4) The coupling device of claim 4, wherein said locking element is reciprocable relative to said member along a predetermined path between said operative and inoperative positions thereof, a protuberance of said at least one male detent extending into said path in response to displacement of said portion of said at least one male detent. ### Claim 7 (depends on 4) The coupling device of claim 4, wherein said locking element comprises a ring which surrounds said member and is reciprocable along said member between said operative and inoperative positions thereof, said displacement means comprising arms which overlie said prongs in the operative position of said ring. ### Claim 8 (depends on 7) The coupling device of claim 7, wherein said affixing means comprises a plurality of male detents provided on said indicator and having protuberances extending axially of said ring and into a path of said arms during movement of said ring to said operative position so that said arms displace said indicator relative to said member. ### Claim 9 (depends on 8) The coupling device of claim 8, wherein said male detents have first terminals and said arms have second terminals spaced apart from said first terminals in the operative position of said locking element. ### Claim 10 (depends on 7) The coupling device of claim 7, wherein said affixing means comprises a plurality of male detents on said indicator, each of said prongs being provided with a female detent, said locking element having slots alternating with said arms and said male detents including extensions extending circumferentially of said tubular member and into sockets constituting said female detents. ### Claim 11 (depends on 10) The coupling device of claim 10, wherein said arms have a first width and said male detents have a greater second width in the circumferential direction of said tubular member. ### Claim 12 (depends on 10) The coupling device of claim 10, wherein said male detents and said prongs have ramps which slide along each other during movement of said locking element to said operative position to facilitate displacement of said indicator relative to said member. ### Claim 13 (depends on 12) The coupling device of claim 12, wherein said indicator is displaceable axially of said member in response to movement of said locking element to said operative position. ### Claim 14 (depends on 1) The coupling device of claim 1, wherein said indicator is substantially C-shaped and has a recess for said second end portion of said tubular connecting member. ### Claim 15 (depends on 14) The coupling device of claim 14, further comprising a closure for said second end portion, said closure being provided in said recess and having at least one readily breakable portion. ### Claim 16 (depends on 15) The coupling device of claim 15, wherein said at least one readily breakable portion includes a web. ### Claim 17 (depends on 15) The coupling device of claim 15, wherein said closure comprises a handle extending substantially axially of said tubular member. ### Claim 18 (depends on 1) The coupling device of claim 1, wherein said indicator comprises a portion extending substantially radially of and away from said tubular member.