Tongue and groove joint for picture frame, has tongue whose upper part and stopper are simultaneously inserted into groove and slit, respectively, in which lower part of tongue fastens rear wall, picture with mount and glass into frame

摘要

The joint has a tongue whose upper part and a stopper (2) are simultaneously inserted into a groove (8) and a slit between a rear wall (6) and a frame (7), respectively to firmly lock the joint. A lower part of the tongue fastens the rear wall, a picture with a mount and a glass into the frame. The upper part of the tongue has a fixed position in the groove. The picture is hung straight by pushing the joint towards left or right.