Push cart

Abstract

A push cart comprises includes a main frame, a handle, a front support, two wheel frames, two wheels, and a retractable rod and a rear support , wherein the main frame has a pair of side rods connected with a pair of rods of the handle in a slidable manner, the center portion of the main frame is connected to each other, and the lower portion of the main frame has is connected with a the wheel frame frames and a wheel respectively the wheels. The lower respective ends portion of the main frame are is connected with respective ends sides of the front support which then meshes with the wheel frame frames. The respective lower ends of the handle are connected with one end of the retractable rod whereas the other end of the retractable rod is connected with the inner center portion of the front support, thus, support. Thus, by operating the handle, the retractable rod is linked to move which then links the front support and the wheel frame to retract or to expand.

I claim:  
     
       1. A push cart comprising a main frame, a handle, a front support, two wheel frames, two wheels, and a retractable rod and a rear support , wherein said main frame having the  respective sides connected to respective sides of said handle in a slidable manner, the center portion of said main frame being connected to respective sides of said rear support, the  a lower portions  of said main frame being connected to said wheel frames which then  are connected to said wheels,  respectively, the lower ends of said main frame being connected  and to respective sides of said front support, Further,  the respective sides of said front support comprising teeth, and said wheel frames having teeth corresponding to and meshing with said teeth of said front support, said handle having its  respective ends connected to one end of said retractable rod, and the other end of said retractable rod being connected to the  an inner center portion of said front support, thus,  such that by operating said handle, linking  thereby engaging said retractable rod and  with said front support and said wheel frames to move simultaneously. 
     
     
       2. The push cart as recited in  claim 1 , wherein said main frame comprising a U-shaped rod, two fixtures secured to the respective  a lower ends  portion of said U-shaped rod, two supporting rods connected to said fixtures,  respectively, two sockets, and a cross bar and two pulling springs, each said supporting rod having a torque spring which has one end secured to said supporting rod while the other end of said torque spring being secured to said rear support , each said fixture comprising a pin, and said sockets being connected to said U-shaped rod and having a  the cross bar extending in between. 
     
     
       3. The push cart, as recited in  claim 1 , wherein said handle shape like  is shaped as a reversed English letter U, comprising  and includes two sliding seats, a cross bar, a lock, a torque spring, and a snap plate, wherein two  respective ends of said handle are inserted into respective sockets of said main frame and secured with said sliding seats of said main frame  respectively, said sliding seats are inserted through respective ends of said U-shaped rod, a  said cross bar being  is set between said sliding seats, and a  the lock being  is set on said cross bar, said lock being  and connected to said torque spring and said snap plate, said snap plate having a slope surface . 
     
     
       4. The push cart, as recited in claim  1   3 , wherein said lock havinghas a stopper at a top end thereof, and said snap plate having ahas at least one stopper at itsa lower left andor right positions, respectivelythereof. 
     
     
       5. The push cart, as recited in  claim 1 , wherein said front support having  has a pair of hinges extending from the respective ends  sides thereof, and each hinge hinges the  said front support to one lower ends  of each said  of two supporting rods of the main frame, and each hinge having  has teeth,  meshing with corresponding teeth of said wheel frame hinged to the lower end of said supporting rod, and said wheel frame corresponding to said teeth of said rear support having formed with teeth for meshing together  frames. 
     
     
       6. The push cart, as recited in  claim 1 , wherein said retractable rod comprising  comprises an outer tube, an inner tube, a stopper and a C-snap ring, whereas  said inner tube being  is sleeved on said outer tube in an sliding manner, and  said inner tube having  has a stopper at its  a top end which comprises  thereof, the stopper has an outer diameter slightly larger than the  an outer diameter of said inner tube and smaller than the  an inner diameter of said outer tube, said stopper comprising  comprises a C-shaped groove at its  a top end thereof, and said outer tube having  has an inner bulge portion, said outer tube having a  and the C-snap rig  ring at the  a lower end and the lower end of said outer tube being connected to the center portion of said rear support  thereof. 
     
     
       7. The push cart, as recited in  claim 6 , further comprising a rear support, wherein the lower portion of said main frame being connected to respective sides of said rear support, and a lower end of said inner tube is connected to the inner center portion of said front support. 
     
     
       8. The push cart, as recited in  claim 2 , further comprising a rear support, wherein the center portion of said main frame being connected to respective sides of said rear support. 
     
     
       9. The push cart as recited in  claim 8 , wherein said main frame further comprises two supporting rods, and each said supporting rods having a pulling spring which has one end secured to said supporting rod while the other end of said pulling spring being secured to said rear support. 
     
     
       10. The push cart as recited in  claim 1 , wherein a length of the retractable rod substantially varies in order to retract the front support and the wheels to the main frame. 
     
     
       11. The push cart as recited in  claim 10 , wherein the retractable rod includes tubes telescopingly engaged to vary the length of the retractable rod. 
     
     
       12. The push cart as recited in  claim 1 , wherein the wheels are retracted by rotating about the main frame. 
     
     
       13. A push cart comprising a handle, a main frame, a front support, two wheels, and a retracting means, wherein the main frame has a left side and a right side being connected to respective sides of the handle in a slidable manner, and a lower portion being connected to the front support and one side of each of the wheels such that the retracting means retracts the front support and the two wheels to the main frame simultaneously, and a length of the retracting means substantially varies in order to retract the front support and the two wheels to the main frame. 
     
     
       14. The push cart according to  claim 13 , wherein the retracting means is connected to a upper portion of the main frame and an inner center portion of the front support so as to retract the front support and the wheels simultaneously. 
     
     
       15. The push cart according to  claim 14 , wherein each of the wheels has a gear, and a right side and a left side of the front support each has at least one gear to mesh with the gear of each of the wheels respectively. 
     
     
       16. The push cart according to  claim 13 , wherein the retracting means is shaped as a rod. 
     
     
       17. The push cart according to  claim 13 , wherein said connection between at least two of the main frame, the front support, the wheels, and the retracting means is provided by at least one pair of meshing gears. 
     
     
       18. The push cart according to  claim 13 , wherein said main frame includes a U- shaped rod, two fixtures secured to a lower portion of said U - shaped rod, two supporting rods connected to said fixtures respectively, two sockets, and a cross bar, each said fixture comprising a pin, and said sockets being connected to said U - shaped rod and having a cross bar extending in between.   
     
     
       19. The push cart according to  claim 13 , wherein said handle has two ends connected to one end of said retracting means, and the other end of said retractable means is connected to an inner center portion of said front support such that said retractable means, said front support and said wheels are linked to move simultaneously by operating said handle. 
     
     
       20. The push cart according to  claim 13 , wherein said handle is shaped like a reversed English letter U and has two sliding seats, and two ends of said handle are respectively inserted into two respective sockets of said main frame so as to be secured with the two sliding seats of the handle. 
     
     
       21. The push cart according to  claim 13 , wherein said handle further has two sliding seats, a cross bar, a lock, a torque spring, and a snap plate, said sliding seats are inserted through respective ends of said U- shaped rod, said cross bar is set between said sliding seats, and said lock is set on said cross bar and connected to said torque spring and said snap plate.   
     
     
       22. The push cart according to  claim 21 , wherein said lock having a stopper at a top end thereof, and said snap plate having at least one stopper at a lower left or right position thereof. 
     
     
       23. The push cart according to  claim 13 , further comprising two wheel frames for connecting the wheels to the main frame, wherein said front support has a pair of hinges extending from respective sides thereof, and each hinge hinges said front support to one lower end of each of two supporting rods of the main frame, and each hinge has teeth meshing with corresponding teeth of each of said wheel frames. 
     
     
       24. The push cart according to  claim 13 , wherein said retracting means comprises an outer tube, an inner tube, a stopper and a C- snap ring, wherein said inner tube being sleeved on said outer tube in a sliding manner, and said inner tube having a stopper at a top end thereof, the stopper has an outer diameter slightly larger than the outer diameter of said inner tube and smaller than the inner diameter of said outer tube, said stopper comprising a C - shaped groove at a top end thereof and said outer tube having an inner bulge portion and a C - snap ring at a lower end thereof.   
     
     
       25. The push cart, as recited in  claim 24 , further comprises a rear support, wherein the lower portion of said main frame is connected to respective sides of said rear support, and a lower end of said inner tube is connected to an inner center portion of said front support. 
     
     
       26. The push cart, as recited in  claim 13 , further comprising a rear support, wherein the right and left sides of said main frame are connected to respective sides of said rear support. 
     
     
       27. The push cart as recited in  claim 26 , wherein said main frame further comprises two supporting rods, and each of said supporting rods has a pulling spring which has one end secured to said supporting rod while the other end of said pulling spring being secured to said rear support. 
     
     
       28. The push cart as recited in  claim 13 , wherein the retracting means includes tubes telescopingly engaged to vary the length of the retracting means. 
     
     
       29. The push cart as recited in  claim 13 , wherein the wheels are retracted by rotating about the main frame.