Patent ID: 8104561

Claim:
A motorized tricycle comprising a frame including first, second, and third cylindrical coupling members having a threaded bore, two rear wheels, and a rear wheels mounting structure comprising: a plurality of side pieces on either side; a plurality of cross pieces interconnecting the side pieces; two spaced cylindrical first joints at two forward ends respectively; two seats each projecting upward from the topmost side piece and comprising a top second joint and a bottom first threaded hole; two second threaded holes each disposed on a section between the first joint and the second joint of the same side; two inverted L-shaped reinforcement plates comprising a hollow boss projecting inward from a bending point, a first through hole proximate one end, and a second through hole proximate the other end; two sleeves each put on the first joint; two cylinders each disposed in the second joint; and a plurality of threaded fasteners wherein at either side of the frame a first threaded fastener is driven through the boss into the second cylindrical coupling member, a second threaded fastener is driven through the first through hole into the second threaded hole, a third threaded fastener is driven through the second through hole into the first threaded hole, a fourth threaded fastener is driven through both the cylindrical joint and the sleeve into the third cylindrical coupling member, and a fifth threaded fastener is driven through both the cylinder and the top joint into the first cylindrical coupling member to secure the reinforcement plate, the rear wheels mounting structure, and the frame together.