Patent ID: 7347476

Claim:
A ramp door and frame assembly comprising: a) a frame assembly configured to extend about a portion of a door opening including an upright member configured to extend substantially vertically along a side region of the door opening; b) a ramp door pivotally connected to the frame assembly to pivot about an axis extending transverse to the upright member near a bottom region of the door opening between a closed position adjacent the upright member and an open position wherein the ramp door serves as a ramp adjacent the opening; c) a lift cable connected to the ramp door at a first distance from the pivot axis, and extending into the upright at a second distance from the pivot axis, wherein the first and second distances are substantially equal; and d) wherein the ramp door has a height measured from the pivot axis to a top edge of the ramp door when the ramp door is closed, and wherein the first distance is selected such that a ratio of the first distance to the height of the door resides within the range of about 0.11 to about 0.21 to minimize lift cable exposure when the ramp door is open.