| 摘要 |
A retractable step apparatus for providing access to a recreational vehicle (6), or trailer includes a mounting frame (10), a top tread assembly (12) pivotally attached to the mounting frame, a center tread assembly (14) swingably coupled to the top tread assembly, and a bottom tread assembly (16) pivotally attached to the center tread assembly. The mounting frame includes right and left mounting brackets (18) and at least one crossmember (20, 22). The top tread assembly includes right and left top brackets (26) and a top step (28) attached between the right and left top brackets. The center tread assembly includes right and left center brackets (36) and a center step (38) attached between the right and left center brackets. The bottom tread assembly includes right and left bottom brackets (46) and a bottom step (48) attached between the right and left bottom brackets. The step apparatus is arranged and configured such that retraction of the assembly is carried out by pivoting the bottom tread assembly 180 degrees into a position above the center tread assembly. The center tread assembly, with the bottom tread assembly upon it, is swung beneath and into the top tread assembly. The top tread assembly, having the center and bottom tread assemblies nested within it, is pivoted from its lower rearward comers into the mounting frame and latched into position such that the entire retractable step assembly is beneath the doorway (17) of the recreational vehicle when not in use. Deployment of the retractable step apparatus is carried out by reversing the above procedure.
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