Corner construction and back up bracket therefor

Claim 1

A back-up clip for corner construction of wall panels consisting of a single piece of sheet material having 1. a flat body portion dimensioned to have a length greater than the thickness of the wall panels; 2. a first flanged member extending substantially perpendicularly from one edge of the body portion; 3. a second flanged member struck-out from and extending continuously substantially perpendicularly from an intermediate portion of the flat body portion in the same direction as tHe first flanged member and in substantially parallel relation therewith, and spaced therefrom by an amount corresponding to the thickness of a first panel for receiving an edge portion of the first panel therebetween; 4. said second flanged member terminating in a free edge, the dimension of said second flange member between said flat body portion and said free edge corresponding to the thickness of a second panel so that when a second panel is positioned parallel to and in abutting relation with the body member and with the edge of the second panel abutting the second flanged portion, the latter will be substantially concealed by the second panel while the edge of the second panel is in abutting relationship with the second flanged member substantially throughout its width; 5. the first flanged member having its free outer edge portion inclined at a slight angle in the direction away from the second flanged member to provide an entrant portion for the first panel into the space between the first and second flanged members; and 6. spring members struck from the first flanged portion adjacent the inclined portion and extending angularly inwardly into the space between the first and second flanged members and in a direction towards the second flanged member and the body portion to prevent retraction movements between the first panel and clip once the first panel has cleared the spring fingers during movement into the space between the first and second flanged members.