# US 12,000,174 B2 · Galley trolley bay door with incorporated turnbutton position indicators > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,174 B2 - Document ID: US12000174B2 - Status: Granted - Kind: B2 - Application number: 17/229,993 - Filed: 2021-04-14 - Published: 2021-10-21 - Granted: 2024-06-04 - Earliest claimed: 2020-04-15 - Assignees: B/E Aerospace, Inc. - Applicants: B/E Aerospace, Inc. - Inventors: Christopher L. Tracey; Gianluigi Malandra - Web page: https://patentgrep.com/patent/US12000174B2 ## CPC - B64D 11/0007: {Devices specially adapted for food or beverage distribution services} - E05B 41/00: Locks with visible indication as to whether the lock is locked or unlocked {(indicator lights E05B17/10)} - B64D 11/04: Galleys - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS ## Abstract A latch indicator system for a trolley bay is disclosed. The system includes a door that includes a latch indicator window. The system further includes an indicator assembly coupled to the door configured to contact a turnbutton then the door is closed and indicate a latched state or an unlatched state of the turnbutton. The indicator assembly includes a latch signal configured to be visible through the latch indicator window when the turnbutton is in the latched state. The indicator assembly further includes an unlatch signal configured to be visible through the latch indicator window when the turnbutton is in the unlatched state. The system further includes a wedge coupled to the flag assembly configured to contact the turnbutton when the turnbutton is in the unlatched state, where upon contact, the flag assembly is translated so that the unlatch signal is visible through the latch indicator window. ## Claims ### Claim 1 A system comprising: a door comprising a front latch indicator window and a rear latch indicator window; a front indicator assembly and a rear indicator assembly coupled to the door configured to contact a respective front turnbutton or a rear turnbutton when the door is closed and indicate a latched state or an unlatched state of the respectively front turnbutton or rear turnbutton, the front indicator assembly and a rear indicator assembly each comprising: a flag assembly comprising: a latch signal, configured to be visible through the latch indicator window when the respective front turnbutton or rear turnbutton is in the latched state; and an unlatch signal, configured to be visible through the latch indicator window when the respective front turnbutton or rear turnbutton is in the unlatched state; and a wedge coupled to the flag assembly configured to contact the respective front turnbutton or rear turnbutton when the respective front turnbutton or rear turnbutton is in the unlatched state, wherein upon contact the flag assembly is translated so that the unlatch signal is visible through the respective front latch indicator window or rear latch indicator window, wherein the respective front turnbutton and rear turnbutton are configured to at least one of securing a respective front trolley and rear trolley or engaging a respective front retainer element or rear retainer element to secure the front trolley and rear trolley. ### Claim 2 (depends on 1) The system of claim 1, further comprising a spring configured to bias the indicator assembly toward the front turnbutton or rear turnbutton. ### Claim 3 (depends on 1) The system of claim 1, wherein the unlatch signal is further configured to be visible through the respective front latch indicator window or the rear latch indicator window upon a malfunction of the indicator assembly. ### Claim 4 (depends on 1) The system of claim 1, further comprising an extended bay, the extended bay having a front side, a rear side, and at least one side wall, the extended bay configured to removably stow the rear trolley adjacent to the rear side and the front trolley adjacent to the front side. ### Claim 5 (depends on 1) The system of claim 1, wherein the extended bay is configured to stow three or more trolleys. ### Claim 6 (depends on 4) The system of claim 4, wherein the extended trolley bay is configured to be implemented in an aircraft. ### Claim 7 (depends on 1) The system of claim 1, wherein the front turnbutton or the rear turnbutton is configured as a retaining element. ### Claim 8 A system comprising: an extended bay, the extended bay having a front side, a rear side, and at least one side wall, the extended bay configured to removably stow a rear trolley adjacent to the rear side and a front trolley adjacent to the front side; a front turnbutton having a latched state and an unlatched state coupled to the extended trolley bay, the front turnbutton in the latched state being configured to at least one of securing a front trolley or engaging a front retainer element to secure the front trolley; a rear turnbutton having a latched state and an unlatched state coupled to the extended trolly bay, the rear turnbutton in the latched state being configured to at least one of securing a rear trolley or engaging a rear retainer element to secure the rear trolley; a bay door comprising a front latch indicator window and a rear latch indicator window; and a front indicator assembly and a rear indicator assembly coupled to the bay door configured to contact the front turnbutton, and the rear turnbutton, respectively, when the bay door is closed and indicate whether the front turnbutton or the rear turnbutton, respectively, is in the latched stated or unlatched state, the front indicator assembly and the rear indicator assembly each comprising: a flag assembly comprising: a latch signal, configured to be visible through the latch indicator window when the respective front turnbutton or rear turnbutton is in the latched state; and an unlatch signal, configured to be visible through the latch indicator window when the respective front turnbutton or rear turnbutton is in the unlatched state; and a wedge coupled to the flag assembly configured to contact the turnbutton when the turnbutton is in the unlatched state, wherein upon contact the flag assembly is translated so that the unlatch signal is visible through the latch indicator window. ### Claim 9 (depends on 8) The system of claim 8, further comprising a spring configured to bias the front indicator assembly toward the front turnbutton. ### Claim 10 (depends on 8) The system of claim 8, wherein the unlatch signal is further configured to be visible through the front latch indicator window upon a malfunction of the front indicator assembly. ### Claim 11 (depends on 8) The system of claim 8, wherein the extended bay is configured to be implemented in an aircraft. ### Claim 12 (depends on 8) The system of claim 8, wherein the extended bay is configured to stow three or more trolleys.