Abstract: A frame for a two wheeled hand cart comprising a single frame useful for a two wheel or four wheel hand cart that is constructed and designed of a molded plastic in a single unitary piece comprising a pair of side frames joined by spaced apart cross rails integrally molded with each of the side rails at pre-selected spaced apart locations to form a molded plastic, rigid frame for receiving handles and wheel assemblies in a frame of improved strength and life.

Abstract: A convertible hand cart convertible between a two wheel hand cart for vertically loading of materials and a four wheel hand cart providing a horizontal material loading platform. The wheel structure for providing the four wheel configuration is pivotably secured to the two wheel structure and movable between the two wheel and four wheel configurations. The two wheel configuration includes structures for locking up the wheel structure for the four wheel configuration thereto. The locking structure is constructed and defined with minimum parts and operable based on vertical sliding action to minimize wear on the locking structure parts. A foot operative mechanism is provided to release the locking structure to permit the wheel structure to be released from a locked up position, hands free, to commence the reconfiguration to the four wheel cart.