| 摘要 |
An apparatus for accessing the bed of a pickup truck having a frame, a rear bumper and a tailgate having a distal edge and being hingedly mounted to the frame includes a lower linkage assembly having proximal and distal ends and being pivotally mounted at its proximal end to the rear truck bumper at a first axis; an upper linkage assembly having proximal and distal ends and being pivotally mounted at its proximal end to and proximal the distal edge of the truck tailgate at a second axis, and being pivotally mounted at its distal end to the distal end of the lower linkage assembly at a third axis; a step connected to the lower linkage assembly; and, wherein the distance between the first and second axes is an effective length LB, the distance between the second and third axes is an effective length LT, and the distance between the first and third axes is an effective length LS, and wherein the ratio of LS to LT to LB to is approximately 2.9 to 1.8 to 4.5. |
