Abstract: A board to board coupling structure coupled between at least two panel assemblies, the board to board coupling structure including a tubular shaft, two locating plates respectively mounted in a longitudinal groove at the tubular shaft, two inner socket assemblies respectively mounted on the tubular shaft, two end caps respectively mounted on the tubular shaft, two outer sockets, a plurality of hook plates, and a plurality of plug plates. The hook plates are fixed to the at least two panel assemblies, each having a hooked portion respectively hooked on a top notch at an outer race at one inner socket and a notch at an upright flange at one outer socket. The plug plates are fixed to the at least two panel assemblies, each having a plug portion inserted in between the socket body and outer race at one inner socket and engaged into the notch at the upright flange at one outer socket.

Abstract: A picture frame assembly has a first picture frame and a second picture frame. The first picture frame has a first connection bar, a first insert rod disposed on the first connection bar, a first connection plate, and a first C-shaped clamp plate disposed on the first connection plate. The second picture frame has a second connection bar, a second insert rod disposed on the second connection bar, a second connection plate, and a second C-shaped clamp plate disposed on the second connection plate. The second insert rod is inserted in the first C-shaped clamp plate.