# US 10,865,926 B2 · Joint device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,926 B2 - Document ID: US10865926B2 - Status: Granted - Kind: B2 - Application number: 15/532,301 - Filed: 2015-12-01 - Published: 2018-09-20 - Granted: 2020-12-15 - Earliest claimed: 2014-12-05 - Assignees: U-Tec Co., Ltd. - Applicants: U-TEC Co., Ltd. - Inventors: Yukio Uenishi; Yuji Kondo - Web page: https://patentgrep.com/patent/US10865926B2 ## CPC - F16L 37/32: at least one of two lift valves being opened automatically when the coupling is applied - F15B 20/00: Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems - F15B 20/002: {Electrical failure} - F15B 20/004: {Fluid pressure supply failure} - F16L 29/002: {joints with taps} - F16L 37/23: by means of balls - F16L 37/30: with fluid cut-off means in each of two pipe-end fittings - F16L 55/07: Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining (apparatus for draining F16T) - F15B 2211/8623: Electric supply failure - F15B 2211/8633: Pressure source supply failure - Y10T 137/87917: Flow path with serial valves and/or closures - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Provided is a joint device which can be connected by quick and simple operation while being subjected to high-pressure high-flow-rate pressurized operating oil. The present invention comprises: a closed chamber 27 provided in a hydraulic circuit on which pressurized fluid acts, the pressurized fluid circuit having an upstream side and a downstream side, which are closed by an upstream-side stop valve 211 and a downstream-side stop valve 212; a male joint 30 provided at a position in communication with the closed chamber 27; and a female joint 40 connectable to the male joint 30 and provided in an emergency hydraulic circuit connected to the hydraulic circuit. The present invention is configured so that the female joint 40 is connected to the male joint 30 while the closed chamber 27 is closed by the upstream-side stop valve 211 and the downstream-side stop valve 212. ## Claims ### Claim 1 A joint device, comprising: an upstream port which connects to an upstream side of a hydraulic circuit; a downstream port which connects to a downstream side of the hydraulic circuit; a closed chamber connected to the upstream port via a first stop valve and connected to the downstream port via a second stop valve; a first joint having a first passage communicating to the closed chamber; and a second joint attachable to the first joint, which has a second passage connected to an emergency hydraulic circuit, wherein the hydraulic circuit is subjected to a pressure fluid from a hydraulic pressure unit, wherein the emergency hydraulic circuit subjected to an emergency pressure fluid from a sub hydraulic pressure unit, wherein upstream and downstream refer to opposite directions of flow relative to the closed chamber, and wherein the first stop valve and the second stop valve are capable of operating independently. ### Claim 2 (depends on 1) The joint device, according to claim 1, wherein the first joint is a male joint while the second joint is a female joint, the male joint comprising: a male joint main body having a male joint path as the first passage and a male joint valve seat between one end of the male joint path on the side of the closed chamber and another end of the male joint path to be connected to the female joint, and a male joint main valve having an abut portion abuttable to the male joint valve seat, the male joint main valve being disposed movably along the male joint path in the male joint path; and the female joint comprising: a female joint main body having a female joint path as the second passage and a female joint valve seat between one end of the female joint path on the side of the sub hydraulic pressure unit and a female joint leading end portion which is another end of the female joint path and is attachable to the male joint, and a female joint main valve having an abut portion abuttable to the female joint valve seat, the female joint main valve being disposed movably along the female joint path in the female joint path, wherein a distance between the abut portion of the male joint main valve and the abut portion of the female joint main valve is made greater than a distance between the male joint valve seat of the male joint main body and the female joint valve seat of the female joint main body, while a leading end portion of the male joint main valve and a leading end portion of the female joint main valve are abutted to each other. ### Claim 3 (depends on 2) The joint device, according to claim 2, wherein the male joint main valve comprises: an in-valve passage penetrating the male joint main valve, the in-valve passage being provided therein with an in-valve seat, and a decompression valve having an abut portion abuttable to the in-valve seat, the decompression valve being disposed movably in the in-valve passage along the in-valve passage, and the decompression valve being disposed so as to protrude from the leading end portion of the male joint main valve.