Patent ID: 8161683

Claim:
An operational mechanism for a window comprising a fixed frame ( 2 ) and a leaf ( 3 ), and a control ( 15 ) of the operational mechanism, which, when operational is arranged to open and close the leaf ( 3 ) to turn around a vertical axis (X-X′) by use of hinges ( 11 ) or which can tilt around a horizontal axis (Y-Y′) depending on the position of the control ( 15 ) arranged to move from a closing position in which the window ( 1 ) is closed, to a first opening position for one of either of the turning or tilling movements of the leaf ( 3 ) depending on the window, in particular turning for a turn tilt window ( 1 ) or tilting for a tilt turn window ( 1 ), and further to a second opening position for another movement of either one of said turning or tilting movements of the leaf depending on the window, in particular tilting for a turn tilt window ( 1 ) or turning for a tilt turn window ( 1 ), the operational mechanism comprising: a scissor mechanism ( 29 ) comprising a guide to be mounted on the leaf and a main arm ( 30 ) which is hinge-mounted to a carriage ( 32 ) which can shift on the guide and which is connected to a hinge of the vertical axis (X-X′) when operational; a slide latch ( 28 ) shiftable by the control ( 15 ) over an outer perimeter ( 8 ) of the leaf; a locking device for locking and unlocking the main arm in relation to the leaf ( 3 ), the locking device having two coupling elements, a first coupling element ( 37 ) located on the main arm ( 30 ) and a second coupling element ( 38 ) located on the slide latch ( 28 ) respectively, which coupling elements can mesh to lock the main arm ( 30 ) by controlling the operational mechanism ( 6 ) for allowing turning of the leaf or be moved apart in view of the free movement of the main arm ( 30 ) for allowing tilting of the leaf, wherein the first coupling element ( 37 ) is formed as a gudgeon fixed on a rotating arm ( 39 ) which is rotatable around an axis ( 40 ) with respect to the main arm, the gudgeon being positioned eccentrically on the rotating arm ( 39 ) at a distance from the axis ( 40 ) and working in conjunction with the second coupling element ( 38 ), the rotating arm ( 39 ) arranged to turn in a reversible manner half a turn between two lockable positions: a first lockable position corresponding to a turn tilt operational mechanism ( 6 ) wherein the first and second coupling elements are meshed when the control ( 15 ) is in a closing or first opening position and are disengaged when the control ( 15 ) is in a second opening position; a second lockable position corresponding to a tilt turn operational mechanism ( 6 ), wherein the first and second coupling elements are disengaged when the control ( 15 ) is in the closing or first opening position and are meshed when the control ( 15 ) is in the second opening position.