# US 11,027,762 B2 · Foldable car seat carriage > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,027,762 B2 - Document ID: US11027762B2 - Status: Granted - Kind: B2 - Application number: 16/710,766 - Filed: 2019-12-11 - Published: 2020-07-09 - Granted: 2021-06-08 - Earliest claimed: 2019-01-04 - Assignees: Wonderland Switzerland AG - Applicants: Wonderland Switzerland AG - Inventors: Curtis M. Hartenstine; Andrew Ma - Web page: https://patentgrep.com/patent/US11027762B2 ## CPC - B62B 7/062: {Coupling unit between front wheels, rear wheels and handle} - B62B 7/145: {the body being a rigid seat, e.g. a shell} - B60N 2/2845: {having handles} - B60N 2/2848: {being convertible or adaptable to a preambulator, e.g. a baby-carriage or a push-chair} - B62B 7/08: in the direction of, or at right angles to, the wheel axis - B62B: HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES (characterised by animal propulsion B62C; propulsion of sledges by driver or engine B62M) - B60N: SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR ## Abstract A foldable car seat carriage includes a frame unit and an engagement unit. The frame unit includes two leg frames. Each of the leg frames includes two legs pivotable relative to each other, and a driving mechanism. The driving mechanism has opposite ends connected pivotally to the legs at first and second intersections. The engagement unit includes two bayonets. Each of the bayonets has a linking portion connected pivotally to the driving mechanism of a respective one of the leg frames. For each of the leg frames, change of a distance between the first and second intersections of the driving mechanism and the legs during pivot action of the legs converts a position of the engagement unit relative to the legs. ## Claims ### Claim 1 A foldable car seat carriage adapted for installation of a car seat thereon, said foldable car seat carriage comprising: a frame unit including two leg frames that are spaced apart from each other in a left-right direction, each of said leg frames including two legs, each of said legs having opposite upper and lower leg ends, and a hub half that is formed on said upper leg end, said hub halves of said legs being rotatably connected to each other such that said legs are pivotable relative to each other, and a driving mechanism that has opposite ends connected pivotally to said legs at first and second intersections; and an engagement unit including two bayonets, each of said bayonets having a linking portion connected pivotally to said driving mechanism of a respective one of said leg frames; wherein, for each of said leg frames, change of a distance between said first and second intersections of said driving mechanism and said legs during pivot action of said legs converts a position of said engagement unit relative to said legs. ### Claim 2 (depends on 1) The foldable car seat carriage as claimed in claim 1, wherein: each of said leg frames further includes a knob protruding parallel to the left-right direction; and each of said bayonets further has a track portion coupled slidably with said knob of the respective one of said leg frames. ### Claim 3 (depends on 2) The foldable car seat carriage as claimed in claim 2, wherein: each of said bayonets is movable upward by said driving mechanism of the respective one of said leg frames to an extended position; and each of said bayonets further has a stop block protruding from said linking portion, and abutting against said knob of the respective one of said leg frames when said bayonet is at the extended position. ### Claim 4 (depends on 1) The foldable car seat carriage as claimed in claim 1, wherein: for each of said leg frames, said driving mechanism includes two links connected pivotally to each other and connected respectively and pivotally to said legs at said first and second intersections; and said linking portion of each of said bayonets is connected pivotally to an intersection of said links of the respective one of said leg frames. ### Claim 5 (depends on 4) The foldable car seat carriage as claimed in claim 4, wherein said frame unit is operable via pivot movement between said legs of each of said leg frames to convert between a setup state, where said lower leg ends of said two legs of each of said leg frames are distal from each other, and a folded state, where said lower leg ends of said two legs of each of said leg frames are proximal to each other. ### Claim 6 (depends on 5) The foldable car seat carriage as claimed in claim 5, wherein for each of said leg frames, the intersection of said links of said driving mechanism is biased upward toward said hub halves of said legs when said frame unit is converted from the folded state to the setup state. ### Claim 7 (depends on 5) The foldable car seat carriage as claimed in claim 5, wherein each of said leg frames further includes a latch which is operable to permit conversion of said frame unit between the setup state and the folded state. ### Claim 8 (depends on 1) The foldable car seat carriage as claimed in claim 1, wherein said frame unit further includes four wheels connected respectively to said lower leg ends of said legs of said leg frames. ### Claim 9 (depends on 1) The foldable car seat carriage as claimed in claim 1, wherein said leg frames are connected to each other by at least one bar. ### Claim 10 A foldable car seat carriage adapted for installation of a car seat thereon, said foldable car seat carriage comprising: a frame unit including two leg frames that are spaced apart from each other in a left-right direction, each of said leg frames including two legs, each of said legs having opposite upper and lower leg ends and a hub half that is formed on said upper leg end, said hub halves of said legs being rotatably connected to each other such that said legs are pivotable relative to each other, and a driving mechanism that has opposite ends connected pivotally to said legs; and an engagement unit including two bayonets, each of said bayonets having a linking portion connected pivotally to said driving mechanism of a respective one of said leg frames at a third intersection, wherein, for each of said leg frames, change of a distance between said hub halves and said third intersection of said driving mechanism and a respective one of said bayonets during pivot action of said legs converts a position of said engagement unit relative to said legs. ### Claim 11 (depends on 10) The foldable car seat carriage as claimed in claim 10, wherein: each of said leg frames further includes a knob protruding parallel to the left-right direction; and each of said bayonets further has a track portion coupled slidably with said knob of the respective one of said leg frames. ### Claim 12 (depends on 11) The foldable car seat carriage as claimed in claim 11, wherein: each of said bayonets is movable upward by said driving mechanism of the respective one of said leg frames to an extended position; and each of said bayonets further has a stop block protruding from said linking portion, and abutting against said knob of the respective one of said leg frames when said bayonet is at the extended position. ### Claim 13 (depends on 10) The foldable car seat carriage as claimed in claim 10, wherein: for each of said leg frames, said driving mechanism includes two links connected pivotally to each other and connected respectively and pivotally to said legs; and said linking portion of each of said bayonets is connected pivotally to an intersection of said links of the respective one of said leg frames at said third intersection. ### Claim 14 (depends on 13) The foldable car seat carriage as claimed in claim 13, wherein said frame unit is operable via pivot movement between said legs of each of said leg frames to convert between a setup state, where said lower leg ends of said two legs of each of said leg frames are distal from each other, and a folded state, where said lower leg ends of said two legs of each of said leg frames are proximal to each other. ### Claim 15 (depends on 14) The foldable car seat carriage as claimed in claim 14, wherein for each of said leg frames, the intersection of said links of said driving mechanism is biased upward toward said hub halves of said legs when said frame unit is converted from the folded state to the setup state. ### Claim 16 (depends on 14) The foldable car seat carriage as claimed in claim 14, wherein each of said leg frames further includes a latch which is operable to permit conversion of said frame unit between the setup state and the folded state. ### Claim 17 (depends on 10) The foldable car seat carriage as claimed in claim 10, wherein said frame unit further includes four wheels connected respectively to said lower leg ends of said legs of said leg frames. ### Claim 18 (depends on 10) The foldable car seat carriage as claimed in claim 10, wherein said leg frames are connected to each other by at least one bar. ### Claim 19 A foldable car seat carriage adapted for installation of a car seat thereon, said foldable car seat carriage comprising: a frame unit including two leg frames that are spaced apart from each other in a left-right direction, each of said leg frames including two legs, each of said legs having opposite upper and lower leg ends, and a hub half that is formed on said upper leg end, said hub halves of said legs being rotatably connected to each other such that said legs are pivotable relative to each other, and a driving mechanism that has opposite ends connected pivotally to said legs; and an engagement unit including two bayonets, each of said bayonets having a linking portion connected pivotally to said driving mechanism of a respective one of said leg frames, wherein said engagement unit is driven to move relative to said legs of said leg frames when a distance between said lower leg ends of said legs of each of said leg frames is changed. ### Claim 20 (depends on 19) The foldable car seat carriage as claimed in claim 19, wherein: each of said leg frames further includes a knob protruding parallel to the left-right direction; and each of said bayonets further has a track portion coupled slidably with said knob of the respective one of said leg frames. ### Claim 21 (depends on 20) The foldable car seat carriage as claimed in claim 20, wherein: each of said bayonets is movable upward by said driving mechanism of the respective one of said leg frames to an extended position; and each of said bayonets further has a stop block protruding from said linking portion, and abutting against said knob of the respective one of said leg frames when said bayonet is at the extended position. ### Claim 22 (depends on 19) The foldable car seat carriage as claimed in claim 19, wherein: for each of said leg frames, said driving mechanism includes two links connected pivotally to each other and connected respectively and pivotally to said legs; and said linking portion of each of said bayonets is connected pivotally to an intersection of said links of the respective one of said leg frames. ### Claim 23 (depends on 22) The foldable car seat carriage as claimed in claim 22, wherein said frame unit is operable via pivot movement between said legs of each of said leg frames to convert between a setup state, where said lower leg ends of said two legs of each of said leg frames are distal from each other, and a folded state, where said lower leg ends of said two legs of each of said leg frames are proximal to each other. ### Claim 24 (depends on 23) The foldable car seat carriage as claimed in claim 23, wherein for each of said leg frames, the intersection of said links of said driving mechanism is biased upward toward said hub halves of said legs when said frame unit is converted from the folded state to the setup state. ### Claim 25 (depends on 23) The foldable car seat carriage as claimed in claim 23, wherein each of said leg frames further includes a latch which is operable to permit conversion of said frame unit between the setup state and the folded state. ### Claim 26 (depends on 19) The foldable car seat carriage as claimed in claim 19, wherein said frame unit further includes four wheels connected respectively to said lower leg ends of said legs of said leg frames. ### Claim 27 (depends on 19) The foldable car seat carriage as claimed in claim 19, wherein said leg frames are connected to each other by at least one bar.