Patent ID: 7819409

Claim:
A foldable wheel seat having a base having a top face; a bottom face; a middle; a front end; a rear end; two side edges; a chamber being defined in the base between the faces of the base; an opening being formed through the bottom face of the base and communicating with the chamber; and a groove being formed in the top face of the base and having at least one end adjacent to the rear end of the base; an operating bar being mounted pivotally in the groove of the base; a first rotating shaft being mounted rotatably in the chamber of the base near the rear end and having two ends, wherein at least one of the ends of the first rotating shaft extends into the groove of the base near the rear end and is securely connected to the operating bar; a middle; and two pulling segments being mounted on the first rotating shaft near the ends of the first rotating shaft, and each pulling segment having two pulling tabs being mounted on the first rotating shaft, being parallel with each other and protruding to the rear end of the base, and each pulling tab having a contacting side; and two wheel axles being mounted rotatably in the chamber of the base respectively near the side edges of the base and being perpendicular to the first rotating shaft and below the pulling tabs of the pulling segments of the first rotating shaft, and each wheel axle having two ends; an engaging block being mounted on the wheel axle below and selectively pushed against by one of the pulling segments of the first rotating shaft; at least two wheels being mounted on the wheel axle between the ends of the wheel axle; a holding panel being mounted on the wheel axle near the first rotating shaft; and a torsional spring being mounted around the wheel axle near the holding panel and having two ends, one of the ends of the torsional spring being connected to the holding panel and the other end being connected to the bottom of the base.