Wheelchair with belt transmission

A wheelchair, comprising:

• a seat portion;
• a pair of stationary mounting plates, each being fixed to a respective side of said seat portion;
• a driving unit mounted on each of said stationary plates;
• a gear unit mounted on each of said stationary plates, said gear unit having a gear shaft provided with a driving pulley which is driven by said driving unit;
• a driven pulley mounted rotatably on each of said stationary plates;
• a pair of endless belts, each interconnecting said driving pulley and said driven pulley on a respective one of said stationary mounting plates such that rotation of said driving pulley is transmitted to said driven pulley;
• a pair of wheels, each connected coaxially to a respective one of said driven pulley;
• a clutch assembly for connecting and disconnecting said driving unit and said gear unit;
• wherein said driving unit includes a driving worm, and said gear unit includes a gear disc having an external toothed periphery meshing with said driving worm and an engaging recess formed in an inner periphery of said gear disc, said gear shaft extending axially into said gear disc movably mounted in an enclosed casing, said gear shaft further having a protrusion projecting radially therefrom and a biasing spring for pushing said gear shaft such that said protrusion normally engages said engaging recess.