US Patent 10370891 Adjustable threshold device

An adjustable door threshold device is disclosed. The device has a user-traversable threshold surface, a transverse surface, and a lift mechanism. The user-traversable threshold surface has a first surface portion and a second surface portion. The transverse surface is positioned transverse to the first surface portion and between the first surface portion and second surface portions. The lift mechanism is operable to move the first surface portion from a lowered position to a raised position. When the first surface portion is in the lowered position the first surface portion is recessed from the second surface portion and the transverse surface extends above the first surface portion for overlapped mating with a door lip.