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In a door lock comprised of an elongated housing in which a piston loaded with a spring is displaceable in two opposite axial directions, a rotatable locking shaft connected to the door wing and provided with a pinion engaged with a rack formed on that piston, the spring is prestressed in the direct

In a door lock comprised of an elongated housing in which a piston loaded with a spring is displaceable in two opposite axial directions, a rotatable locking shaft connected to the door wing and provided with a pinion engaged with a rack formed on that piston, the spring is prestressed in the direction of the closing of the door. The spring acts on a displaceable supporting member which displaces the piston in the housing of the lock. An electromotor actuated by a control unit is operated to displace the supporting member.

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In an automatic door lock for opening and closing a door wing, comprising a housing having an elongated cylindrical portion formed with a cylindrical bore, a hydraulic piston-cylinder unit including a piston displaceable in said bore, a rotatable locking shaft connected to the door wing and cooperat

In an automatic door lock for opening and closing a door wing, comprising a housing having an elongated cylindrical portion formed with a cylindrical bore, a hydraulic piston-cylinder unit including a piston displaceable in said bore, a rotatable locking shaft connected to the door wing and cooperating with said piston and rotatable upon displacing of said piston in said bore to effect a movement of the door wing to a closed postion and to an opened position; spring means disposed in said bore and operative for loading said piston and said locking shaft in the direction of closing the door wing, said piston-cylinder unit having a pressure chamber, said housing being formed with a pressure medium return passage; throttle means in said return passage; a check valve opening into said pressure chamber, said pressure chamber of the piston-cylinder unit being connected at one side thereof with said return passage via said throttle means and at another side thereof with said check valve; the improvement comprising a movable supporting member interconnected immediately between said piston and said spring means; and an external energy source, said supporting member being controllably driven by the external energy source in the direction of prestressing of said spring means in dependence upon operation of the door wing.