Self leveling flush slide-out floor

An expandable housing structure comprising,

• a primary housing structure having a floor with at least one outer edge,
• an expandable area unit having a floor with inner and outer extremities and movable between a first housed position within the primary housing structure and a second position contiguous to the primary structure, where, in the housed position, the expandable area unit floor is superimposed over and is supported by the primary structure floor, and in the second position the floor of the expandable area unit is contiguous to and flush with the floor of the primary structure, and
• extension and retraction means comprising,
• at least one extensible beam attached to the primary housing structure and having an outer cantilevered end,
• a coupling, slidable in a plane perpendicular to the said floors, and interconnecting the outer extremity of the expandable area unit floor and the outer cantilevered end of the extensible beam,
• at least one roller carried by the primary housing structure proximate it outer edge and defining a rolling contact between the primary structure floor and the expandable area unit floor,
• a support shelf depressed from the level of the primary structure floor and carried by the primary structure outwardly of the roller and adapted to support the inner extremity of the expandable area unit floor in a position flush with the primary structure floor when the expandable unit is in its extended position.

In mobile living quarters comprising,

• a frame,
• a main floor supported by the frame,
• walls and ceiling attached to the main floor to form a living area,
• a retractable living area extension having a floor and mounted for movement from a retracted position over the main floor to an extended position where the floor of the living area extension is contiguous to the main floor and flush therewith,
• at least one beam, carried by the frame and laterally extensible from the frame, supporting the retractable living area extension,
• the improvement comprising,
• an interconnection between the extensible beam and the living area extension, which interconnection comprises a fixed member and a moveable member that are linearly slidable with respect to one another in a plane perpendicular to the floor of the living area extension between a raised retracted position and a lowered extended position, and wherein the interconnection includes means biasing the living area extension to one of the said two positions.