Patent ID: 7287806

Claim:
A recreational vehicle comprising: a main housing defining an interior living space having a floor located at a first level wherein the main housing defines a first wall having an opening formed therein; an expandable room having a floor an outer wall positioned within the opening in the first wall of the main housing, wherein the expandable room is adapted to be movable between a retracted position wherein the floor of the expandable room is positioned at a second level above the first level of the floor of the main housing and the outer wall is positioned substantially adjacent the first wall of the main housing and a deployed position wherein the outer wall is extended away from the first wall of the main housing and the floor of the expandable room is positioned at a third level below the second level so as to be more planar with the first level; and a vertical movement mechanism mounted to the main housing and comprising at least one telescoping armature, comprising a piston configured to be actuated and provide vertical movement, the vertical movement mechanism further comprising a roller coupled to the at least one telescoping armature and oriented to engage and lift and lower the floor of the expandable room and to provide a rolling support for the floor of the expandable room during movements between retracted and deployed positions, such that an upward movement of the at least one telescoping armature results in vertical movement of the roller so as to exert a force having an upward component on the expandable room to thereby move the floor of the expandable room from the third level to the second level and wherein a downward movement of the at least one telescoping armature results in a downward movement of the roller so as to permit the floor of the expandable room to move from the second level to the third level.