A push cart, including: a frame, a rear wheel assembly, a front wheel assembly, a connection rod linkage. The frame includes an upper frame and a lower frame, and the upper frame is disposed on the lower frame. The rear wheel assembly is movably disposed on the lower frame or the upper frame. The fr
A push cart, including: a frame, a rear wheel assembly, a front wheel assembly, a connection rod linkage. The frame includes an upper frame and a lower frame, and the upper frame is disposed on the lower frame. The rear wheel assembly is movably disposed on the lower frame or the upper frame. The front wheel assembly is disposed on the lower frame. The frame is connected to the rear wheel assembly via the connection rod linkage. The rotation of the upper frame or the lower frame drives the connection rod linkage to flatten the rear wheel assembly with the upper frame or the lower frame, or to unfold the rear wheel assembly.
대표청구항▼
1. A push cart, comprising: a frame, the frame comprising an upper frame and a lower frame, the upper frame comprising an upper pipe and a handlebar, and the lower frame comprising a rear wheel mounting pipe and two lower frame pipes;a rear wheel assembly;a front wheel assembly; anda connection rod
1. A push cart, comprising: a frame, the frame comprising an upper frame and a lower frame, the upper frame comprising an upper pipe and a handlebar, and the lower frame comprising a rear wheel mounting pipe and two lower frame pipes;a rear wheel assembly;a front wheel assembly; anda connection rod linkage, the connection rod linkage comprising two linkage units, and each of the two linkage units comprising a first connection rod, a first sliding block, and a second connection rod; wherein: the upper frame is disposed on the lower frame;the rear wheel assembly is movably disposed on the rear wheel mounting pipe;the rear wheel mounting pipe is connected to the upper pipe;the front wheel assembly is disposed on the lower frame;the frame is connected to the rear wheel assembly via the connection rod linkage;in operation, the rotation of the upper frame drives the connection rod linkage to flatten the rear wheel assembly with the upper frame, or to unfold the rear wheel assembly;the first connection rod is connected to the upper frame and the first sliding block;the first sliding block is movably disposed on the lower frame;the second connection rod is connected to the first sliding block and the rear wheel assembly;the second connection rod is connected to the rear wheel assembly via a fixed seat;the fixed seat is movably disposed on the rear wheel mounting pipe;the fixed seat is fixedly connected to the rear wheel assembly;the handlebar is disposed on top of the upper pipe;the two lower frame pipes are disposed in parallel on the rear wheel mounting pipe;the upper pipe is rotatably disposed on the rear wheel mounting pipe;the first sliding block of one of the two linkage units is disposed on one of the two lower frame pipes, and the first sliding block of the other one of the two linkage units is disposed on the other one of the two lower frame pipes;the rear wheel mounting pipe is provided with a joint seat and two seat sleeves;the joint seat is sandwiched in the two seat sleeves;the upper pipe is inserted in the joint seat, and the two lower frame pipes are inserted in the two seat sleeves, respectively;a folding buckle is disposed at an outer side of the joint seat, and the joint seat is located in an opening of the folding buckle;two ends of the folding buckle are coupled to the joint seat via a rotating shaft;a tube plug is disposed in the joint seat, and the tube plug comprises a second sliding block and an elastic resetting mechanism operating to reset the second sliding block;a fixed bolt runs through the folding buckle, the joint seat, the tube plug and the second sliding block;the fixed bolt is adapted to drive the second sliding block to slide up and down in the joint seat;the two seat sleeves each comprise a first locking groove and a second locking groove;when the push cart is in an unfolded state, two ends of the fixed bolt are clamped in two first locking grooves of the two seat sleeves, respectively; andwhen the push cart is in a folded state, two ends of the fixed bolt are clamped in two second locking grooves of the two seat sleeves, respectively. 2. The push cart of claim 1, wherein the elastic resetting mechanism comprises a spring, and the second sliding block is located below the spring. 3. A push cart, comprising: a frame, the frame comprising an upper frame and a lower frame, the lower frame comprising a rear wheel mounting pipe;a rear wheel assembly;a front wheel assembly; anda connection rod linkage, the connection rod linkage comprising two linkage units, and each of the two linkage units comprising a first connection rod, a first sliding block, and a second connection rod; wherein: the upper frame is disposed on the lower frame;the rear wheel assembly is movably disposed on the rear wheel mounting pipe;the rear wheel mounting pipe is connected to the upper frame;the front wheel assembly is disposed on the lower frame;the frame is connected to the rear wheel assembly via the connection rod linkage;in operation, the rotation of the upper frame drives the connection rod linkage to flatten the rear wheel assembly with the upper frame, or to unfold the rear wheel assembly;the first connection rod is connected to the upper frame and the first sliding block;the first sliding block is movably disposed on the lower frame;the second connection rod is connected to the first sliding block and the rear wheel assembly;the second connection rod is connected to the rear wheel assembly via a fixed seat;the fixed seat is movably disposed on the rear wheel mounting pipe;the fixed seat is fixedly connected to the rear wheel assembly;the fixed seat is provided with an installation seat, and the second connection rod is connected to the fixed seat via the installation seat;the fixed seat comprises a first base plate and two first side plates respectively disposed at two sides of the first base plate;the rear wheel assembly is fixedly connected to the first base plate;one end of the rear wheel mounting pipe is disposed between the two first side plates; andthe fixed seat is connected to the connection rod linkage. 4. The push cart of claim 3, wherein the installation seat comprises a second base plate and two second side plates respectively disposed at two sides of the second base plate; the second base plate is located at an outer side of the first side plate and connected to the first side plate. 5. The push cart of claim 3, wherein the installation seat comprises a first spherical connector, the first sliding block is provided with a second spherical connector, one end of the second connection rod is provided with a first spherical joint, and another end of the second connection rod is provided with a second spherical joint; the first spherical joint corresponds to and is received by the first spherical connector, and the second spherical joint corresponds to and is received by the second spherical connector. 6. A push cart, comprising: a frame, the frame comprising an upper frame and a lower frame, the upper frame comprising two parallel disposed upper pipes and a handlebar disposed on top of the two upper pipes, and the lower frame comprising a lower frame pipe and a rear wheel mounting pipe;a rear wheel assembly;a front wheel assembly; anda connection rod linkage, the connection rod linkage comprising two linkage units, and each of the two linkage units comprising a first connection rod, a first sliding block, and a second connection rod; wherein: the upper frame is disposed on the lower frame;the front wheel assembly is disposed on the lower frame;the frame is connected to the rear wheel assembly via the connection rod linkage;in operation, the rotation of the upper frame drives the connection rod linkage to flatten the rear wheel assembly with the upper frame, or to unfold the rear wheel assembly;the first connection rod is connected to the lower frame and the first sliding block;the first sliding block is movably disposed on the upper frame;the second connection rod is connected to the first sliding block and the rear wheel assembly;the lower frame pipe is disposed on the rear wheel mounting pipe;the rear wheel assembly is movably disposed on the rear wheel mounting pipe;the rear wheel mounting pipe is connected to the two upper pipes;the lower frame pipe is adapted to rotate relative to the rear wheel mounting pipe;the two upper pipes are disposed on the rear wheel mounting pipe;the first sliding block of one of the two linkage units is disposed on one of the two upper pipes, and the first sliding block of the other one of the two linkage units is disposed on the other one of the two upper pipes;the rear wheel mounting pipe is provided with two joint seats and a seat sleeve;the seat sleeve is sandwiched in the two joint seats;the two upper pipes are inserted in the two joint seats, respectively, and the lower frame pipe is inserted in the seat sleeve;a folding buckle is disposed at an outer side of the seat sleeve, and the seat sleeve is located in an opening of the folding buckle;two ends of the folding buckle are coupled to the seat sleeve via a rotating shaft;a tube plug is disposed in the seat sleeve, and the tube plug comprises a second sliding block and an elastic resetting mechanism operating to reset the second sliding block;a fixed bolt runs through the folding buckle, the seat sleeve, the tube plug and the second sliding block;the fixed bolt is adapted to drive the second sliding block to slide up and down in the joint seat;the two joint seats each comprise a first locking groove and a second locking groove;when the push cart is in an unfolded state, two ends of the fixed bolt are clamped in two first locking grooves of the two joint seats, respectively; andwhen the push cart is in a folded state, two ends of the fixed bolt are clamped in two second locking grooves of the two joint seats, respectively. 7. The push cart of claim 6, wherein the elastic resetting mechanism comprises a spring, and the second sliding block is located behind the spring.
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