Patent ID: 7744102

Claim:
An articulated steerable carriage apparatus for manually transporting a payload across a surface, comprising: (a) a first frame portion; (b) a second frame portion; (c) a yoke assembly including a pivotal axial axis, said yoke assembly disposed adjacent to said first frame portion and said second frame portion, said yoke facilitating pivotal movement about said pivotal axial axis between said first frame portion and said second frame portion, said yoke further including a means for urging said first frame portion and said second frame portion into a non-turning mode, wherein said means for urging into non turning mode is operational when said articulated steerable carriage apparatus is static in relation to the surface; (d) a first rotating element rotationally attached to said first frame portion and forming a first contact on the surface; and (e) a second rotating element rotationally attached to said second frame portion forming a second contact on the surface, said second rotating element and said second frame portion are operational to be steerable through said pivotal movement.