Frame corner structure

A corner structure for window frames and the like comprising:

• a bracket having a pair of angularly disposed legs, each leg being of rigid metal and having a surface opposed to a surface on an adjacent leg, each opposed surface also having a pair of longitudinally spaced triangular depressions therein;
• a pair of metal frame members each having a longitudinally extending channel extending from a mitred end, each channel being defined by opposed sides slideably receiving a respective leg of the bracket;
• the depression in one surface of each leg nearest the opposed surface of the other leg having a depth less than the depth of the other depression by at least the thickness of the adjacent side of said channel;
• and
• the said adjacent side of each channel having a pair of longitudinally spaced tongues extending in a direction away from the respective mitred end into a respective depression, each tongue engaging at least part of both surfaces of the depression to urge said mitred ends of said frame members together, the two longitudinally spaced depressions in each leg being laterally offset relative to one another, with the tongues in said depressions being correspondingly laterally offset.