Wheeled platform system

A driving apparatus for a mobile platform, comprising:

• a rail;
• a drive system extending from a bottom end of the rail to a position above the bottom end of the rail;
• a wheel connected to the drive system at the bottom end of the rail;
• a crank arm rotatably coupled to a portion of the drive system at the position above the bottom end of the rail;
• and
• a handle coupled to the crank arm and movable between a first position and a second position relative to the drive system;
• wherein with the handle in the first position, a brake limits rotation of the crank arm;
• and
• wherein with the handle in the second position, the brake is released, and the crank arm is rotatable to drive the drive system.

A wheeled platform, comprising:

• a first assembly including:
• a first pair of spaced apart rails;
• at least one rung extending between and coupled to the first pair of spaced apart rails;
• a first pair of wheels coupled to respective bottom ends of the first pair of spaced apart rails;
• and
• a first pair of hinge portions coupled to the first pair of spaced apart rails;
• a second assembly including:
• a second pair of spaced apart rails;
• a second pair of wheels coupled to respective bottom ends of the second pair of spaced apart rails;
• and
• a second pair of hinge portions coupled to the second pair of spaced apart rails, wherein the first pair of hinge portions and the second pair of hinge portions are coupled to each other to form a pair of pivotable hinges movable between a first position in which the first pair of rails extends at a non-parallel angle relative to the second pair of rails and a second position in which the first pair of rails extends parallel to the second pair of rails;
• and
• at least one platform coupled with and extending between the first assembly and the second assembly below the pair of pivotable hinges.