Drive for a leaf of a door or window, having a drive shaft , a motor driving the drive shaft , and an output shaft for transmitting a torque from the motor to the leaf; and an assembly for inhibiting in a directed manner the transmission of torque between the drive shaft and the output shaft, wherein the assembly comprises: at least one transmission element for the torque; a spring which for conjoint rotation is coupled to the transmission element ; and a static spring receptacle by way of which the spring is mounted so as to be rotatable under friction; wherein the spring has at least one first entrainment portion for interacting with the transmission element ; and wherein the spring is disposed in such a manner that a transmission of torque in a first rotation direction from the transmission element to the first entrainment portion reduces the friction between the spring and the spring receptacle such that a rotation of the transmission element conjointly with the spring is released, and/or that a transmission of torque in a second rotation direction, in particular counter to the first rotation direction, from the transmission element to the first entrainment portion , increases the friction between the spring and the spring receptacle such that a rotation of the transmission element conjointly with the spring is inhibited; wherein the assembly has two transmission elements, specifically an input element which is assigned to the drive shaft , and an output element which is assigned to the output shaft, wherein the input element and the output element comprise axially overlapping half-shaft portions and wherein a rotational guide element for the input element and the output element is provided, in particular wherein the rotational guide element is disposed so as to be concentric with and/or to axially overlap the spring receptacle , characterized in that the input element and the output element in the region of the half-shaft portions have in each case one guide region which corresponds to the rotational guide element and is disposed so as to be in sliding contact with the rotational guide element . at least one transmission element for the torque; a spring which for conjoint rotation is coupled to the transmission element ; and a static spring receptacle by way of which the spring is mounted so as to be rotatable under friction; wherein the spring has at least one first entrainment portion for interacting with the transmission element ; and wherein the spring is disposed in such a manner that a transmission of torque in a first rotation direction from the transmission element to the first entrainment portion reduces the friction between the spring and the spring receptacle such that a rotation of the transmission element conjointly with the spring is released, and/or that a transmission of torque in a second rotation direction, in particular counter to the first rotation direction, from the transmission element to the first entrainment portion , increases the friction between the spring and the spring receptacle such that a rotation of the transmission element conjointly with the spring is inhibited; wherein the assembly has two transmission elements, specifically an input element which is assigned to the drive shaft , and an output element which is assigned to the output shaft, wherein the input element and the output element comprise axially overlapping half-shaft portions and wherein a rotational guide element for the input element and the output element is provided, in particular wherein the rotational guide element is disposed so as to be concentric with and/or to axially overlap the spring receptacle , characterized in that the input element and the output element in the region of the half-shaft portions have in each case one guide region which corresponds to the rotational guide element and is disposed so as to be in sliding contact with the rotational guide element . <EOS>