IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0547704
(2014-11-19)
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등록번호 |
US-9199655
(2015-12-01)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Muncy, Geissler, Olds & Lowe, P.C.
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인용정보 |
피인용 횟수 :
4 인용 특허 :
5 |
초록
A foldable cart includes a frame mechanism and a control mechanism. The control mechanism can drive the frame mechanism to be in a collapsed state or an expanded state.
대표청구항
▼
1. A foldable cart comprising: a frame mechanism including a main frame body that has two spaced-apart upright first pipes, two second pipes respectively and telescopically inserted into said first pipes, and two third pipes respectively connected to bottom ends of said first pipes,a carrier that is
1. A foldable cart comprising: a frame mechanism including a main frame body that has two spaced-apart upright first pipes, two second pipes respectively and telescopically inserted into said first pipes, and two third pipes respectively connected to bottom ends of said first pipes,a carrier that is rotatably connected to bottom ends of said third pipes, andtwo spaced-apart wheel members that are respectively connected to and pivotable about said third pipes and that are connected to said carrier for pivoting in a simultaneous manner with a rotating movement of said carrier; anda control mechanism including two drive units for rotating said carrier, each of said drive units corresponding to one of said first pipes and one of said second pipes, and including a driven gear member that is drivingly connected to said carrier for rotation of said carrier and that is disposed below the corresponding one of said first pipes, anda driving rack member that is disposed inside the corresponding one of said first pipes in an upward and downward movable manner and that is connected to a bottom end of the corresponding one of said second pipes to move along therewith, said driving rack member being meshable with said driven gear member to drive said driven gear member. 2. The foldable cart as claimed in claim 1, wherein, when said frame mechanism is in a collapsed state, said carrier is folded over a front side of said main frame body, said wheel members are non-rollably situated at a rear side of said main frame body, and said bottom ends of said second pipes are respectively proximate to said bottom ends of said first pipes such that said driving rack members respectively mesh with said driven gear members; and wherein, when said second pipes are moved upward to enable said bottom ends of said second pipes to move to top ends of said first pipes, respectively, said driving rack members respectively drive rotation of said driven gear members, which causes said carrier to rotate forward, downward and away from said front side of said main frame body and to bring said wheel members to displace away from said rear side of said main frame body thereby permitting said wheel members to roll forward or rearward, placing said frame mechanism in an expanded state and separating said driving rack members from said driven gear members. 3. The foldable cart as claimed in claim 1, wherein each of said first pipes has first positioning hole proximate to a top end of said first pipe, each of said second pipes having a second positioning hole proximate to said bottom end of said second pipe, each of said drive units further including a lock member that is mounted inside the corresponding one of said second pipes, said control mechanism further including an operating unit that is connected to and operates said lock members of said drive units to respectively move inside said second pipes, wherein, when said frame mechanism is in an expanded state, each of said second pipes extends upwardly from the respective one of said first pipes, such that said lock member of the corresponding one of said drive units is engaged to said first positioning hole in the corresponding one of said first pipes and said second positioning hole in the corresponding one of said second pipes to prevent the corresponding one of said second pipes from being movable relative to the corresponding one of said first pipes. 4. The foldable cart as claimed in claim 3, wherein each of said first pipes further has a first hole edge that bounds said first positioning hole, each of said second pipes further having a second hole edge that bounds said second positioning hole, said lock member having a hook portion that protrudes resiliently into said second positioning hole of the corresponding one of said second pipes, said hook portion having a bottom engaging segment, and a guide segment that extends upwardly and inclinedly from said bottom engaging segment, wherein, when said second positioning hole of each of said second pipes is in communication with said first positioning hole of the corresponding one of said first pipes, said hook portion of said lock member of the corresponding one of said drive units springs outward from said second positioning hole, and engages said first positioning hole, such that said bottom engaging segment of said hook portion abuts against said first hole edge of the corresponding one of said first pipes to prevent said second pipe from moving downward relative to the corresponding one of said first pipes, and when said lock member of each of said drive units is pulled upward, said guide segment of said hook portion slidably abutting against said second hole edge of the corresponding one of said second pipes, such that said hook portion is pressed inward to depart from said first positioning hole of the corresponding one of said first pipes and to allow downward movement of the corresponding one of said second pipes. 5. The foldable cart as claimed in claim 4, wherein said driving rack member of each of said drive units has an insertion portion that is inserted into said bottom end of the corresponding one of said second pipes, a push portion that is extended upwardly from said insertion portion, and a rack portion that extends downwardly from said insertion portion to mesh with said driven gear member, said insertion portion having a mounting space for said hook portion to be mounted resiliently therein, said hook portion further having a resilient straight segment that has an upper section abutting against said push portion, and a lower section resiliently bendable relative to said upper section and connected to said guide segment. 6. The foldable cart as claimed in claim 5, wherein said mounting space of said insertion portion has an upper compartment and a lower compartment communicated with said upper compartment, said bottom engaging segment and said guide segment of said hook portion of said lock member being disposed in said second compartment, each of said drive units further including a resilient member sleeved on said straight segment and disposed in said upper compartment to urge downward said hook portion. 7. The foldable cart as claimed in claim 1, wherein said driven gear member is rotatable about a rotation axis of said carrier, said driven gear member having a rotator body that is formed with a radial gear tooth to mesh with said driving rack member and a lever arm that extends radially from said rotator body to engage and rotate said carrier. 8. The foldable cart as claimed in claim 7, wherein said carrier has an engaging slot to receive engagingly said radial lever arm. 9. The foldable cart as claimed in claim 1, wherein said control mechanism further includes an operating unit that is connected to said driving rack members of said drive units and that is operable to move upward or downward said driving rack members. 10. The foldable cart as claimed in claim 9, wherein said main frame body further has a handle member that is connected to said second pipes and said operating unit. 11. The foldable cart as claimed in claim 10, wherein each of said drive units further includes a lock member disposed inside the corresponding one of said second pipes and engageable with the corresponding one of said first pipes to prevent the corresponding one of said second pipes from moving relative to the corresponding one of said first pipes. 12. The foldable cart as claimed in claim 11, wherein said lock members of said drive units are connected to said operating unit to move along with said driving rack members.
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