US Patent 7849657 Connector for frames used in building

A clip or connector is provided for assembling part of a door or window frame having first and second sheet material frame members to be retained in abutting relationship and in a particular predetermined position relative to each other. Each frame member has a concave channel formation along its length. The clip has a head and a body with a neck therebetween. The head engages with a tight interference or frictional fit within the channel formation of the first frame member and the body engages with a tight interference or frictional fit within the channel of the second frame member, such that the frame members are located and held in their particular predetermined position.