Wedge based circuit board retainer

A locking retainer comprising:

• at least three wedge members movably linked to each other and disposed in longitudinal sequence along a longitudinal axis;
• the at least three wedge members comprising a middle wedge member disposed between the other two of the three wedge members;
• wherein the locking retainer is movable between a first configuration having a relatively smaller height and a second configuration having a relatively larger height by moving the wedge members longitudinally such that a longitudinal distance between a first wedge member and a last wedge member of the sequence becomes smaller without the wedge members being longitudinally displaced along a common internal longitudinal element;
• wherein all portions of the locking retainer that the middle wedge member is longitudinally moveable relative to do not extend through a theoretical plane disposed at a longitudinal midpoint of the middle wedge member and oriented normal to the longitudinal axis.

A locking retainer comprising:

• a plurality of wedge members including at least a first, second, third, fourth, and fifth wedge members arranged sequentially along a longitudinal axis, with the first wedge member disposed most proximally and the fifth wedge member disposed most distally;
• a plurality of links movably connecting adjacent wedge members;
• wherein no link extends for more than three wedge members;
• a mounting segment disposed proximally from the first wedge member;
• wherein the retainer is moveable between a retracted configuration and an extended configuration:
• wherein, in the retracted configuration:
• the retainer has first height normal to the longitudinal axis;
• the mounting segment and the fifth wedge are separated by a first distance;
• the first wedge and fifth wedge are separated by a second distance;
• wherein, in the extended configuration:
• the retainer has second height normal to the longitudinal axis;
• the second height greater than the first height;
• the mounting segment and the fifth wedge are separated by the first distance;
• the first wedge and fifth wedge are separated by a third distance;
• the third distance less than the second distance.