US Patent 10400439 Transformable house

A transformable house comprises a stationary part and a movable part placed inside the stationary part and configured to move out of the stationary part along a first direction of the movable part by a first distance. The movable part includes a first sub section having a first width equal to the first distance and a second sub section having a second width that is the rest of a width of the movable part, the second sub section including a water tank. The first width and the second width are determined to meet the following equation: W1×D1=W2×D2, wherein W1, W2, D1, and D2 are the weight of the first sub section, the weight of the second sub section, the first width, and the second width, respectively.