Patent ID: 6972961

Claim:
A modular electronic system using a tongue and groove arrangement to restrain motion of electronic modules, the modular electronic system comprising: an equipment rack with a plurality of openings for receiving electronic modules, wherein an opening is defined by a left side wall, a right side wall, and a bottom surface, where the left side wall has a first side and a second side and further defines-a first groove on the first side of the left side wall disposed a first height above the bottom surface and a second groove on the second side of the left side wall at a second height above the bottom, the second height different than the first height, where the right side wall further defines a third groove disposed the second height above the bottom surface, where the first groove faces the opening and the second groove does not face the opening; and a plurality of electronic modules with housings adapted to slidably couple into openings of the equipment rack, where a housing for an electronic module further comprises at least a left side wall and a right side wall, where the left side wall of the electronic module comprises a first tongue that is adapted to slidably mate with the first groove in a corresponding left side wall of the equipment rack, and where the right side wall of the electronic module comprises a second tongue that is adapted to slidably mate with the third groove in a corresponding right side wall of the equipment rack.