A foldable cart includes a frame mechanism, a wheeled rear support mechanism and two spaced-apart handle units. The frame mechanism can be in a collapsed state or an expanded state. The wheeled rear support mechanism is mounted pivotally to a rear side of a main frame body of the frame mechanism and
A foldable cart includes a frame mechanism, a wheeled rear support mechanism and two spaced-apart handle units. The frame mechanism can be in a collapsed state or an expanded state. The wheeled rear support mechanism is mounted pivotally to a rear side of a main frame body of the frame mechanism and movable between a supporting position and a fully folded position with respect to the main frame body. The handle units are rotatably connected to the main frame body to drive the frame mechanism to be in the collapsed state or the expanded state.
대표청구항▼
1. A foldable cart comprising: a frame mechanism including a longitudinal main frame body,a carrier frame pivotally connected to a bottom end of said main frame body and rotatable in one of a forward-and-downward direction and a rearward-and-upward direction;two spaced-apart front wheel members resp
1. A foldable cart comprising: a frame mechanism including a longitudinal main frame body,a carrier frame pivotally connected to a bottom end of said main frame body and rotatable in one of a forward-and-downward direction and a rearward-and-upward direction;two spaced-apart front wheel members respectively connected to two sides of said bottom end of said main frame body and respectively having horizontal shafts that are swivelable in a first horizontal plane, anda gear unit connected to said main frame body, said carrier frame and said front wheel members,wherein, when said frame mechanism is in a collapsed state, said carrier frame is folded upward to confront with said main frame body above said bottom end, and said horizontal shafts of said front wheel members are substantially in the front-rear direction of said main frame body to limit said front wheel members from rolling forward or rearward, and when said frame mechanism is in an expanded state, said carrier frame is extended forward from said bottom end of said main frame body, and said horizontal shafts of said front wheel members are extended transversely to the front-rear direction of said main frame body to permit said front wheel members to roll forward or rearward;a wheeled rear support mechanism mounted pivotally to said main frame body opposite to said carrier frame and movable between a supporting position where said wheeled rear support mechanism is unfolded to roll on the ground, and a fully folded position where said wheeled rear support mechanism is folded to move away from the ground; andtwo spaced-apart handle units rotatably connected to said main frame body and respectively connected to said front wheel members, said handle units being further connected to said gear unit to drive said gear unit which in turn drives said carrier frame and said front wheel members so that said carrier frame is unfolded to extend forward or folded upward and said horizontal shafts swivel in the first horizontal plane,wherein said wheeled rear support mechanism includes a rear support frame that has a top end pivotally connected to said main frame body and a bottom end opposite to the top end, two rear wheels that are mounted to the bottom end of said rear support frame, a first link member that has a first end pivotally connected to and slidable along said rear support frame, and a second end opposite to the first end, and a second link member having a front end pivotally connected to said main frame body and a rear end pivotally connected to the second end of said first link member; andwherein, when said wheeled rear support mechanism moves to the supporting position from the fully folded position, said rear end of said second link member extends away from said main frame body and abuts against said front wheel members, and said first end of said first link member slides downward on said rear support frame such that said first link member extends substantially in the front-rear direction to move said bottom end of said rear support frame away from said main frame body. 2. The foldable cart as claimed in claim 1, wherein each of said front wheel members has a wheel bracket that is swivelably disposed at a corresponding one of said two sides of said main frame body and a front wheel that is mounted in said wheel bracket, said wheel bracket having a joining portion, each of said handle units having a transmission rod that is connected to said main frame body and that is coaxial with said wheel bracket, a handlebar that bends from a top end of said transmission rod, and a driving bar that bends from a bottom end of transmission rod, said driving bar being connected to said joining portion of said wheel bracket, said handlebar being operable to rotate said transmission rod and said driving bar so as to swivel said wheel bracket. 3. The foldable cart as claimed in claim 2, wherein said wheel brackets of each of said front wheel members further has a limiting seat transversely extending from said joining portion in a direction toward said wheel bracket of the other one of said front wheel members when said frame mechanism is in the expanded state, said rear end of said second link member being seated on said limiting seats to limit movements of said joining portions so that said wheel brackets of said front wheel members are prevented from swiveling when said wheeled rear support mechanism is in the supporting position. 4. The foldable cart as claimed in claim 3, wherein said wheeled rear support mechanism is further movable to a half-folded position intermediate of the fully folded and expanded positions, and, when said wheeled rear support mechanism moves from the fully folded position to the half-folded position, said rear end of said second link member is seated on said limiting seats between said joining portions, and said first end of said first link member slides upward on said rear support frame to move said bottom end of said rear support frame to said main frame body. 5. The foldable cart as claimed in claim 2, wherein, when said wheeled rear support mechanism moves to the fully folded position, said rear end of said second link member moves away from said limiting seats and is folded over a rear side of said main frame body, and the swiveling of said wheel brackets pushes said second link member to move forward and toward said main frame body and to be positioned at the rear side of said main frame body. 6. The foldable cart as claimed in claim 2, wherein said rear support frame further has two spaced-apart rear rods that extend from said top end to said bottom end of said rear support frame and that is pivotally connected to said main frame body in proximity to said top end of said rear support frame, and a cross bar that is connected between said rear rods in proximity to said bottom end of said rear support frame, said rear wheels being respectively connected to said rear rods at said bottom end of said rear support frame, said first link member having a slide rod with two opposite ends slidably and respectively connected to said rear rods at said first end of said first link member and two spaced-apart first link rods pivotally and respectively connected to said two opposite ends of said slide rod, said second link member being connected pivotally to said main frame body and further connected pivotally between said first link rods. 7. The foldable cart as claimed in claim 6, wherein said rear wheels of said rear support mechanism are rotatable in a second horizontal plane parallel with the first horizontal plane. 8. The foldable cart as claimed in claim 6, wherein said main frame body has two spaced-apart main rods, and top and bottom transverse bars, said top transverse bar being connected between top ends of said main rods, said bottom transverse bar being connected between bottom ends of said main rods, said transmission rods of said handle units being respectively connected to said main rods, said rear rods being respectively connected to said transmission rods, said front end of said second link member being pivotally disposed between said main rods, said rear end of said second link member being disposed pivotally between said first link rods. 9. The foldable cart as claimed in claim 8, wherein said main frame body further has two spaced-apart transverse rods which are disposed between said top and bottom transverse bars and each of which has two opposite ends connected respectively to said main rods, said two opposite ends of each of said transverse rods respectively having two tubular pivot seats projecting respectively from said main rods, said transmission rods of said handle units respectively extending through said tubular pivot seats of each of said transverse rods. 10. The foldable cart as claimed in claim 1, wherein said gear unit has two first gears that are respectively and coaxially connected to said front wheel members and that are rotatable in the first horizontal plane, two second gears that are connected coaxially to said carrier frame and rotatable in a vertical plane perpendicular to the first horizontal plane, and two third gears that are mounted on said main frame body, each of said third gears meshing with a respective one of said first gears and a respective one of said second gears.
Herbault, Patrick; Marques, Frédéric; Saulnier, Fabien, Convertible transport trolley having a pair of fold-away legs and simultaneously fold-away wheels.
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