×

Method and apparatus for transporting and steering a load

  • US 6,581,525 B2
  • Filed: 05/09/2001
  • Issued: 06/24/2003
  • Est. Priority Date: 05/09/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A load-carrying transport apparatus for moving a load over a surface, the transport apparatus comprising:

  • a substructure for carrying the load above the surface;

    a track member positioned on the surface adjacent the substructure;

    a plurality of lift assemblies mounted on the substructure selectively operable for extension toward the surface to engage the track member and raise the substructure above the surface so that it is carried on the track member, and for retraction to lower the substructure onto the surface and disengage from the track member; and

    a shifter mechanism disposed adjacent the substructure and the track member selectively operable for displacing the substructure along the track member when the lifting assemblies have been extended toward the surface to raise the substructure above the surface and for displacing the track member on the surface relative to the substructure when the lifting assemblies have been retracted and disengaged from the track member.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×