Patent ID: 8240686

Claim:
A self-steering apparatus comprising: a frame; a steering bracket fixedly mounted to a steering bar of the frame; two couples of axles, each axle being hingedly fastened to a corresponding axle fastening hole of the frame; a couple of balance-maintenance devices hingedly fastened to balance-maintenance device fixing holes of the frame and the axles respectively; a couple of axle connecting members, each axle connecting member being hingedly fastened to a corresponding couple of the two couples of axles via axle fastening holes of the axle connecting member; a couple of knuckles, each knuckle being hingedly fastened to one of the couple of axle connecting members by a couple of up-and-down kingpins; a couple of knuckle arms fixedly mounted to a couple of lower kingpins; and a couple of wheels rotatably fastened to the couple of knuckles, wherein a couple of rods steer the knuckle arms depending on a slope of the frame, the frame is balanced by the balance maintenance device, and a direction of the couple of wheels is determined depending on a slope of the frame.