US Patent 7237294 Tri-folding ramp

The tri-folding ramp is a portable, collapsible device that includes three sections which define an upper surface of the ramp as having an arc-shaped profile. The arc-shaped profile of the ramp can reduce the loading angle between the distal end of the ramp and an upper loading surface, thereby inhibiting contact between the vehicle's undercarriage and the ramp's upper surface and/or the upper loading surface as the vehicle is entering or exiting the ramp.