A battery case holding mechanism comprising an engaging means for engaging a battery case which is detachably inserted into a concave formed in a body of an electric apparatus and is biased so as to be detached from the concave and disengagement preventing means which is actuated when the engaging means...http://www.google.fr/patents/US4146682?utm_source=gb-gplus-shareBrevet US4146682 - Battery case holding mechanism
