# US 2021/0276628 A1 · Indoor maintenance cover of bus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0276628 A1 - Document ID: US20210276628A1 - Status: Published application - Kind: A1 - Application number: 17/000,526 - Filed: 2020-08-24 - Published: 2021-09-09 - Earliest claimed: 2020-03-06 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Seung-Ju Lee - Web page: https://patentgrep.com/patent/US20210276628A1 ## CPC - B62D 25/2054: {Load carrying floors for commercial vehicles} - B62D 25/105: {for motor cars} - B62D 25/12: Parts or details thereof (locks E05B, {E05B83/16; devices for holding open E05C17/00, e.g. while carrying oversize objects E05C17/042}; hinges E05D; counterbalancing means E05F; {checks, stops, buffers E05F5/00; } springs, {e.g. pneumatic springs} F16F) - B62D 31/02: for carrying large numbers of passengers, e.g. omnibus - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) ## Abstract An indoor maintenance cover of a bus includes: a frame mounted on a maintenance hole; a first door and a second door in which respective both ends are connected to the frame by a hinge pin to open/close the maintenance hole; an interlocking device configured to join a hinge pin connected to one end of the first door and a hinge pin connected to one end of the second door, the interlocking device facing the hinge pin so that the first door and the second door rotate while interlocking with each other; and a fastener fastening the first door and the second door while the first door and the second door are closed. The maintenance cover can be installed to prevent accidents while increasing operability for easily opening or closing the maintenance hole in the bus. ## Claims ### Claim 1 An indoor maintenance cover of a bus, comprising: a frame mounted on a maintenance hole; a first door and a second door in which respective both ends are connected to the frame by a hinge pin to open/close the maintenance hole; an interlocking device configured to join a hinge pin connected to one end of the first door and a hinge pin connected to one end of the second door, the interlocking device facing the hinge pin so that the first door and the second door rotate while interlocking with each other; and a fastener fastening the first door and the second door while the first door and the second door are closed. ### Claim 2 (depends on 1) The indoor maintenance cover of claim 1, wherein a first end of the hinge pin is inserted into the insertion hole formed in the frame and a second end is fixed to the first door or the second door. ### Claim 3 (depends on 2) The indoor maintenance cover of claim 2, wherein an extraction hole is formed on one side of the insertion hole so that the first end of the hinge pin is extracted from the frame. ### Claim 4 (depends on 1) The indoor maintenance cover of claim 1, wherein the interlocking device is a wire, and a hinge pin connected to one end of the first door and a hinge pin connected to one end of the second door are wound in a staggered winding scheme by the wire. ### Claim 5 (depends on 4) The indoor maintenance cover of claim 4, wherein a wire guide is formed in the wire so as to prevent the wire from being twisted. ### Claim 6 (depends on 4) The indoor maintenance cover of claim 4, wherein a spring is formed so that a first end of the spring is connected to the frame and a second end of the spring is connected to the wire to maintain tension of the wire. ### Claim 7 (depends on 4) The indoor maintenance cover of claim 4, wherein a fixation pin is formed at a portion where the wire is wound on the hinge pin so as to prevent the wire from being loosen. ### Claim 8 (depends on 1) The indoor maintenance cover of claim 1, wherein the fastener includes: a fastening bracket having a fastening hole formed on one side and mounted on the first door or the second door, and a fastening bolt in which a first end of the fastening bolt is inserted into the fastening hole and a washer is mounted on a second end of the fastening bolt. ### Claim 9 (depends on 1) The indoor maintenance cover of claim 1, wherein the frame includes a first locking jaw formed to support the first door or the second door to be closed and a second locking jaw formed to support the first door or the second door to be opened.