Corner fastener

A corner fastener for use in forming a frame assembly by interconnecting at a predetermined angle elongated tubular members having a hollow internal space of a predetermined and generally rectangular cross sectional area comprising a pair of legs at such predetermined angle with respect to each other connected to a junction member, each of the legs being adapted for disposition within the interior of the elongated tubular members and being of such a cross sectional area so as to substantially and securely fill the internal space of the elongated tubular members, the junction member being of such configuration so as to be contiguous with the outer walls of the tubular members, and the junction member having a generally hemispherically-shaped nipple projecting outwardly to provide sufficient clearance between the frame assembly and window frame to maintain a temperature and humidity equilibrium.

A frame assembly formed by interconnecting at a predetermined angle elongated tubular members having a hollow internal space of a predetermined and generally rectangular cross sectional area and extending from the tubular member and for its entire length is an L-shaped member which in turn forms with the tubular member a U-shaped channel, adapted for disposition within the U-shaped channel is a spline to effect the securement of tubular members, the improvement comprising a corner fastener having a pair of legs at such predetermined angle with respect to each other connected to a junction member, each of the legs being adapted for disposition within the interior of the elongated tubular members and being of such cross sectional area so as to substantially and securely fill the internal space of the elongated tubular members, the junction member being of such configuration so as to be contiguous with the outer walls of the tubular members, and the first and second junction members each having a resilient finger projecting outwardly and curving medially to effect securement of the frame assembly to a window frame, and the third and fourth junction members each having a generally hemispherically-shaped nipple projecting outwardly to provide sufficient clearance between the frame assembly and window frame to maintain a temperature and humidity equilibrium.