VORRICHTUNG ZUR ELEKTRISCHEN ENERGIEVERSORGUNG VON TUERSCHLOESSERN

In door locks which are provided with an electromagnetic tumbler which locks them in the currentless state, a current source supplying them and a control circuit which can be acted upon by keys, in particular also in electronic cylinder locks which can be activated with electromechanically encoded keys and operated by means of a replaceable battery, the door lock can no longer be correctly opened when the current source or the battery is unexpectedly exhausted. In order, nevertheless, to achieve this, an emergency power supply device is provided which consists of an auxiliary power source (21) accommodated in the lock (3) in addition to its power supply source (18) and briefly chargeable in a contactless manner by means of a reception aerial (6) arranged accessibly on the outside of the door in the door closing area and of a charging device (9) which can be temporarily attached to the outside of the door and has a correspondingly situated transmitting aerial (8). The charging device (9) is advantageously provided with a holding key (7) connected movably and electrically to it and pluggable with its shaft (7') into the locking cylinder (3) and having, on its side at the end, the transmitting aerial (8) of the charging device (9) suspended on it.