Door lock including electrically actuable coupling arrangement

Claim 1

A lock comprising a lock bolt and a knob means, a first shaft connected to the knob means and arranged to rotate when turning the knob means, a second rotatable shaft whose rotational axis is coaxial in relation to the first shaft and which is arranged upon rotation to displaee the lock bolt between a lock-release and lock-engage position, and an electrically actuable coupling arrangement provided for releasably connecting said first and second shafts with one another to enable the lock bolt to be moved to a lock-release position upon rotation of the knob means, said electrically actuable coupling arrangement including a plate non-rotatably mounted on one of the aforesaid shafts and the periphery of which has provided therein at least one tooth, a bracket structure non-rotatably mounted on the other of said two shafts and carrying a catch pivotable about a pivot axis extending perpendicularly in relation to and at a distance from the common rotational axis of the said mutually coaxial first and second shafts, and an electrical operating means operatively connected with said catch for swinging the same into and out of thelpath of movement of said tooth, said electrical operating means including a rotatable electric motor stationarily mounted with its shaft extending substantially perpendicularly in relation to and located at a distance from the common rotational axis of said mutually coaxial first and second shafts, an eccentric mounted on said motor shaft, and a link mechanism arranged between the catch and said eccentric for swinging the catch about its pivot axis upon rotation of the motor.