Actuating arrangement for window casement or door leaf fittings

A door or window unit, comprising

• a turnable and tiltable door leaf or window casement structure having door or window fittings, said structure having a closed position, a turning position, and a tilting position;
• a pusher bar operating said turnable and tiltable door leaf or window casement structure;
• and
• an arrangement for actuating said door or window fittings, said arrangement including
• a housing having a longitudinal axis and mounted on said door leaf or window casement structure,
• an actuating handle mounted on said housing for turning about an axis, and
• a transmission accommodated in said housing and actuated by said actuating handle, said transmission including
• a slide centered on a central longitudinal axis, mounted in said housing for displacement along said longitudinal axis of said housing, and having an elongated guiding groove centered on a groove axis extending at an acute angle with respect to said central longitudinal axis of said slide,
• an eccentric connected to said actuating handle and equipped with an entraining pin which is received in said housing groove of said slide for movement longitudinally of said guiding groove, said entraining pin having a central axis, said slide extending along an imaginary plane which is intersected by said turning and central axis at respective intersecting points, and
• an entraining member secured to said slide and coupled with said pusher bar,
• said actuating handle being switchable between a first position which corresponds to said closed position of said structure, a second position which corresponds to said turning position of said structure, and a third position which corresponds to said tilting position of said structure, so that when said actuating handle is in said first and third positions of said structure and spaced from one another by 180.degree. a connecting line which connects said intersecting points extends at a right angle with respect to said longitudinal groove axis, and when said actuating handle is in said second position corresponding to said turning position of said structure said longitudinal groove axis extends through said intersecting point of said turning axis with said imaginary plane, whereby with a constant angular speed of said actuating handle a speed of said entraining member in said first and third positions goes to zero and in said second position reaches a maximum and with a constant torque at said actuating handle a force which acts on said entraining member in said first and third positions reaches a maximum and in said second position reaches a minimum.