A printed circuit board heat sink retainer is disclosed comprising a mating pair of sawtoothed bars with slidably engaging teeth. The bars are laterally spread apart and held by a forcing device, which may be a screw or a spring, in order to push against and hold a heat sink in a channel. The distance...http://www.google.fr/patents/US4721155?utm_source=gb-gplus-shareBrevet US4721155 - Sawtooth card retainer
