Panel end structure and panel joint

Claim 1

A joint for two panels each having first and second generally parallel metallic sheets separated by a thermally and electrically insulating core, the joint comprising: a. first and second panel end structures each comprising: 1. a portion of each of said first and second sheets extending beyond said core to form first and second sheet ends; 2. an elongated metallic unitary member having five planar sides in cross section, side 1 being parallel to side 3, side 2 connecting sides 1 and 3 and being perpendicular to side 1, sides 4 and 5 meeting sides 1 and 3 respectively at obtuse angles, side 4 meeting and being perpendicular to side 5, one of sides 4 or 5 having a planar self-aligning joining surface mateable with a similar surface on another similar unitary member, and a planar extension to the side having the self-aligning joining surface extending the joining surface beyond the junction of sides 4 and 5 and forming a flange mateable with a similar flange on another similar unitary member; 3. side 4 of the unitary member being joined to said first sheet end; and 4. insulating means for thermally and electrically insulating and mechanically joining side 5 of the unitary member from and to said second sheet end; and b. fastening means for securely joining the self-aligning planar joining surfaces of said first and second panel end structures.