Patent ID: 8770598

Claim:
A hand truck, comprising: a frame body, having a L-shaped cross section, comprising a load platform for carrying a load thereon, and a handle upwardly extended from said load platform, wherein said handle comprises two parallel handle members; and a wheel assembly which comprises: two wheel frames rearwardly extended from said handle members respectively, wherein each of said wheel frames comprises two retention walls rearwardly extended from said respective handle member of said handle to define a guiding channel between said retention walls; and two wheel units spacedly supported at said handle of said frame body, wherein each of said wheel units comprises a wheel housing, a wheel member rotatably held at said wheel housing, and a switching shaft upwardly extended from said wheel housing, wherein said switching shafts of said wheels units are rotatably received in said guiding channels respectively to move said wheel members between a first operation position and a second operation position, wherein each of said wheel frames further comprises a first locking slot defined between said two retention walls, a second locking slot formed at a bottom edge of one of said respective retention walls, and a retention member upwardly protruded from said respective wheel housing, wherein in said first operation position, said switching shafts are rotated in said guiding channels until said wheel members are oriented in parallel planes for enabling said frame body to move in a back-and-forth direction, wherein said wheel unit is retained in said first operation position when said retention member is moved at said first locking slot between said retention walls, wherein in said second operation position, said switching shafts are rotated in said guiding channels until said wheel members are oriented to align with each other in a common plane for enabling said frame body to move in a left-and-right direction, wherein said wheel unit is retained in said second operation position when said retention member is moved at said second locking slot at said bottom edge of said respective retention wall.