| 主权项 |
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; and two 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; and wherein, 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. |
