Collapsible and extension is used for increasing building structure in advertisement space

The utility model discloses a collapsible and extension is used for increasing building structure in advertisement space, including bottom support element, middle data expanding unit, top layer extension unit, extension hoist mechanism and displacement locking mechanism, bottom support element includes bottom braced frame, bottom braced frame top is equipped with the loading board, the bottom is equipped with the counter weight board, middle data expanding unit include the suit in extension frame in the middle of on the bottom braced frame, middle extension frame has the edge the degree of freedom of bottom braced frame rebound, the top layer extend the unit include the suit in top layer on the middle extension frame extends the frame, the top layer extends the frame and has the edge the degree of freedom of middle extension frame rebound. The utility model discloses installation design is nimble, and the transportation is removed conveniently, and display space is big, effectual, is convenient for demonstrat