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A push cart transferable to a back holder and a chair includes a pair of connecting mounts jointing a bottom frame and a back frame as well an angle adjusting device jointing with an upper frame and the back frame; wherein the angle adjusting device adjusts the rotation angle of the upper frame; the

A push cart transferable to a back holder and a chair includes a pair of connecting mounts jointing a bottom frame and a back frame as well an angle adjusting device jointing with an upper frame and the back frame; wherein the angle adjusting device adjusts the rotation angle of the upper frame; the bottom frame displaces and positions vertically or horizontally in a concave slot of the connecting mount; the connecting mounts slide at a limited distance on a left and a right lateral tubes of the back frame so as to fulfill the embodiment of being a push cart, a back holder or a chair.

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1. A push cart transferable to a back holder and a chair comprises:a bottom frame having two adjoining ends disposed with transverse through holes; two connecting mounts of a longitudinal through hole, the transverse through hole and a concave slot are disposed on a main body thereof; an adjoining e

1. A push cart transferable to a back holder and a chair comprises:a bottom frame having two adjoining ends disposed with transverse through holes; two connecting mounts of a longitudinal through hole, the transverse through hole and a concave slot are disposed on a main body thereof; an adjoining end of the bottom frame is received inside the concave slot.a shaft rod penetrates into the transverse through hole of the connecting mount and the transverse through holes of the adjoining ends to allow the bottom frame to rotate by using the shaft rod as a turning shaft;upper retaining convex portions and lower retaining convex portions are respectively disposed on lower segments of two left and right lateral tubes of a back frame; the left and right lateral tubes located between the upper and the lower retaining convex portions are movably connected into the longitudinal through holes of the connecting mounts;a pair of turning wheels are movably connected at the lower segments of the left and right lateral tubes;on lower segments of two left and right lateral tubes of an upper frame are positioned slightly above the upper aspects of the left and right lateral tubes of the back frame respectively through an angle adjusting device,wherein a turning shaft is disposed between the pair of turning wheels to penetrate into a transverse through hole of a brake device thereby freely rotating therein; the brake device is clamped fixedly by a clamp slot of the main body thereof at the lower end of the left and right tubes of the back frame; an outer lateral wall of the brake device is disposed with a convex rod which penetrates transversely into the clamp slot and further fixedly connects with the left and right lateral tubes of the back frame;a rocker arm has a front end disposed with a concave portion and a rear end movably connected at a lower aspect of the bottom frame through a shaft portion to allow the rocker arm to rotate by using the shaft portion as a turning shaft thereby making the concave portion to selectively retain on to the convex rod. 2. A push cart transferable to a back holder and a chair according to claim 1, wherein the angle adjusting device comprises:a left disk and a right disk with surfaces thereof disposed respectively with concavo-convex rim surfaces; through holes are disposed at a circle center of the left and right disks; outer peripheral rims of hole walls of the through holes are formed as circular concave slots; two ends of a spring insert respectively into the circular concave slots;a screw rod penetrates into predetermined through holes of the left and right lateral tubes of the back frame, the central through holes of the left and right disks, the spring and through holes on the left and right lateral tubes of the upper frame; furthermore, a nut fixedly screws at the outer end of the screw rod; the mesh between the concavo-convex rim surfaces on the left and right disks adjusts the inclination degree between the upper frame and the back frame. 3. A push cart transferable to a back holder and a chair according to claim 1, wherein front and rear rims of a seat cover respectively connect with the shaft rod and a front transverse rod of the bottom frame; a back cover is sleeved onto the back frame, wherein the backside of the back cover is disposed with a back strap and a long strap having a male, button disposed at the front end thereof; a female button is disposed on the bottom surface of the seat cover; the buckling of the male and female buttons positions the folded upper frame, the back frame and the seat cover. 4. A push cart transferable to a back holder and a chair according to claim 1, wherein the position near a front segment at a lower aspect of the bottom frame is disposed with a pair of foldable and expandable positioning frames; the folded positioning frame affixes to the bottom surface of a seat cover; the lower aspects on two sides of the bottom frame are disposed with concave portions for re taining; inner sides of the left and right lateral tubes of the upper frame are disposed with convex posts to be selectively retained onto the convex portions.