Stairway accessible carry cart with foldaway wheels

Claim 1

A carry cart or the like comprising a main frame with a handle portion at an upper end thereof and a support frame (13) at a lower end thereof, primary wheels (12, 11) being fixed to said lower end of said main frame, the improvement comprising: foldaway auxiliary wheels (21) which in extended state project rearwardly from said lower portion of said main frame; each of said foldaway auxiliary wheels (21) being rotatably supported by a respective wheel support (3); support blocks (5) being fixed in vertical alignment at lower positions of said main frame, each of said support blocks (5) having a safety hook (51) protruding therefrom; said foldaway auxiliary wheels (21) being foldable about two-way hinges (6); each of said two-way hinges including upper plates (61, 62) which are complementary to each other, said upper plates (61, 62) further comprising an upper left plate (62) and an upper right plate (61), lower plates (63, 64), said lower plates (63, 64) further comprising a lower left plate (63) and a lower right plate (64), four rods (71, 72, 73, and 74), and four springs (81, 82, 83, and 84); one of said respective upper plates (61, 62) being fixed to a lateral side of said support block (5); said upper plate (62, 61) being fixed to said wheel supports (3); and auxiliary wheels (21, 22) which are each fixed on and pivotable about said upper plate (62, 61) of said two-way hinges (6), a pin (41) extending from said wheel support (3) so that said safety hook (51) is latchable thereto to prevent said auxiliary wheel (21, 22) from slipping out of place when in use.