A locker unit comprises a plurality of lockers provided with doors equipped with a locking device. The locking device consists of a mechanical lock and an auxiliary lock having an electric drive for said device. The locking device comprises a rest position which blocks the access to the mechanical lock...http://www.google.es/patents/US5219386?utm_source=gb-gplus-sharePatente US5219386 - Locker unit comprising a plurality of lockers
