Rear wheel steering hand cart with integrated brake system

1. A rear wheel steering hand cart with an integrated brake system, comprising:

a main body ( 10 );

a push handle ( 20 ), disposed on one end of the main body ( 10 );

a wheel unit ( 30 ) disposed under the main body ( 10 ), including at least three wheels arranged in two rows, a rear wheel ( 32 ) of the wheel unit ( 30 ) disposed on one end of the push handle ( 20 ) connected to main body ( 10 ) by a wheel seat ( 50 );

the wheel seat ( 50 ) including an upper wheel seat ( 53 ) disposed on the main body ( 10 ) and a lower wheel ( 51 ) connecting to a wheel axle ( 33 ), the upper wheel seat ( 53 ) and the lower wheel ( 51 ) connecting to each other by a rotary shaft ( 52 );

a wheel stop device ( 40 ) disposed between the real wheels ( 32 ) and the wheel seat ( 50 );

wherein further comprising a clutch device ( 60 ) disposed between the upper wheel seat ( 53 ) and the lower wheel seat ( 51 ), comprises:

a first clutch element ( 61 ) covered the rotary shaft ( 52 ), radial position connected to the upper wheel seat ( 53 );

a second clutch element ( 63 ), covered the rotary shaft ( 52 ), radial position connected to the lower wheel seat ( 51 ), and

a clutch device control division, controlling the separation and close of the first clutch element ( 61 ) and the second clutch element ( 63 ).

2. The rear wheel steering hand cart with an integrated brake system as claimed in claim 1 , wherein the clutch device control division connects to the wheel stop device ( 40 ) for controlling locking and unlocking of the wheel stop device ( 40 ).

3. The rear wheel steering hand cart with an integrated brake system as claimed in claim 1 , wherein the clutch device control division is a control rod ( 71 ) parallel to the rotary shaft ( 52 ), and being glided between the upper wheel seat ( 53 ) and the lower wheel seat ( 51 ), the first clutch element ( 61 ) fixedly connects to the upper end of the control rod ( 71 ), and the second clutch element ( 63 ) is disposed on the lower end of the control rod ( 71 ) and fixedly connects to the lower wheel seat ( 51 ); the clutch device control division further comprises a control holder ( 72 ), one end of the control holder ( 72 ) is hinged to the upper wheel seat ( 53 ), and the middle part of the control holder ( 72 ) connects to the control rod ( 71 ).

4. The rear wheel steering hand cart with an integrated brake system as claimed in claim 3 , wherein further comprises a restoring spring ( 56 ) disposed between the first clutch element ( 61 ) and the lower wheel seat ( 51 ).

5. The rear wheel steering hand cart with an integrated brake system as claimed in claim 3 , wherein the second clutch element ( 63 ) is a two-V-shape open grooves ( 631 ), the two-V-shape open grooves ( 631 ) connects to each other; the first clutch element ( 61 ) is a bump ( 611 ), and two intro bevels are disposed at two covers of the bump ( 611 ).

6. The rear wheel steering hand cart with an integrated brake system as claimed in claim 3 , wherein the second clutch element ( 63 ) is a first tooth flank ( 632 ), and the shape of the upper end of the first tooth flank ( 632 ) is smaller than it of the bottom end of the first tooth flank ( 632 ); the first clutch element ( 61 ) is a second tooth flank ( 612 ) meshing with the first tooth flank ( 632 ).

7. The rear wheel steering hand cart with an integrated brake system as claimed in claim 6 , wherein the shapes of the first tooth flank ( 632 ) and the second tooth flank ( 612 ) are triangle, involute, arc, or acumination cusp.

8. The rear wheel steering hand cart with an integrated brake system as claimed in claim 3 , wherein the second clutch element ( 63 ) is multi shrinkage pools ( 633 ) disposed on a radial line, each of the multi shrinkage pools ( 633 ) comprises a V-shape expansion open connecting to each other by their edges, and the first clutch element ( 61 ) is a convex cylinder ( 613 ) corresponding to the shrinkage pool ( 633 ).

9. The rear wheel steering hand cart with an integrated brake system as claimed in claim 8 , wherein the convex cylinder ( 613 ) has a cup head or a pointed end.

10. The rear wheel steering hand cart with an integrated brake system as claimed in claim 1 , wherein the clutch device control division is a first pull component ( 73 ), which comprises a first pull sheath ( 731 ) and a first pull ( 732 ) glided along the inside of the first pull sheath ( 731 ); one end of the first pull ( 732 ) connects to a first brake handle ( 733 ) of the push handle ( 20 ), another end of the first pull ( 732 ) connects to the rotary shaft ( 52 ) or the wheel seat ( 51 ); one end of the first pull sheath ( 731 ) connects to a first brake rack ( 734 ), another end of the first pull sheath ( 731 ) connects to the first clutch element ( 61 ).

11. The rear wheel steering hand cart with an integrated brake system as claimed in claim 10 , wherein the first clutch element ( 61 ) has a T-shape groove ( 614 ); a step sleeve ( 735 ) is disposed on a coupling end of the first pull sheath ( 731 ) and the first clutch element ( 61 ), the step sleeve ( 735 ) is embedded in the T-shape groove ( 614 ).

12. The rear wheel steering hand cart with an integrated brake system as claimed in claim 1 , wherein the first clutch element ( 61 ) is fixed on the upper wheel seat ( 53 ), and the second clutch element ( 63 ) is glided up and down along the rotary shaft ( 52 ).

13. The rear wheel steering hand cart with an integrated brake system as claimed in claim 12 , wherein the clutch device control division is a second pull component ( 74 ), which comprises a second pull sheath ( 741 ) and a second pull ( 742 ) glided along the inside of the second pull sheath ( 741 ); one end of the second pull ( 742 ) connects to a second brake handle ( 743 ) of the push handle ( 20 ), another end of the second pull ( 742 ) connects to the wheel stop device ( 40 ) and the second clutch element ( 63 ); one end of the first pull sheath ( 731 ) connects to a first brake rack ( 734 ), another end of the first pull sheath ( 731 ) is fixed to the first clutch element ( 61 ).

14. The rear wheel steering hand cart with an integrated brake system as claimed in claim 1 , wherein the wheel stop device ( 40 ) comprises a tooth block ( 41 ) disposed on wheels, middle part of the tooth block ( 41 ) is hinged to a deflector rod ( 42 ) of the lower wheel seat ( 51 ), a fixture block ( 421 ) disposed on the head end of the deflector rod ( 42 ) is embedded into the tooth block ( 41 ), the rear end of the deflector rod ( 42 ) connects to the clutch device control division.