Roof window with a second operational condition and method of installing the roof window

Method of installing a roof window wherein a frame, sash, and pane of the roof window are provided in a supply condition, comprising the steps of:

• disengaging the sash from the frame, wherein the frame comprises a set of frame members including a top frame member, two side frame members and a bottom frame member and the sash comprises a set of sash members including a top sash member, two side sash members and a bottom sash member, each frame member and sash member defining a longitudinal direction, and the roof window furthermore comprises a hinge assembly configured to allow the sash to be tophung about a substantially horizontal first hinge axis in a first operational condition in a mounted condition of the roof window and comprising a hinge unit with a frame hinge part connected to or connectable to at least the top frame member and a sash hinge part connected to at least the top sash member, the hinge assembly comprises means to allow the sash to be rotated about a substantially horizontal second hinge axis at a distance from the top frame member and top sash member to provide a plurality of additional open positions in a second operational condition, the roof window further comprises a sash installation component to support the sash in the second operational condition of the roof window,
• preparing the frame for installation,
• positioning the frame in an opening in a roof structure,
• connecting the frame to the roof structure,
• placing the sash installation component on the frame,
• subsequently bringing a first engagement portion of the hinge assembly into engagement to put the roof window into the second operational condition, and
• bringing a second engagement portion of the hinge assembly into engagement to put the roof window in the first operational condition of the roof window.

A roof window, comprising:

• a frame, a sash, and a pane, in which
• the frame comprises a set of frame members including a top frame member, two side frame members and a bottom frame member and the sash comprises a set of sash members including a top sash member, two side sash members and a bottom sash member, each frame member and sash member defining a longitudinal direction, and in which
• the roof window furthermore comprises a hinge assembly configured to allow the sash to be tophung about a substantially horizontal first hinge axis in a first operational condition in a mounted condition of the roof window and comprising a hinge unit with a frame hinge part connected to or connectable to at least the top frame member and a sash hinge part connected to at least the top sash member,
• the hinge assembly comprises means to allow the sash to be rotated about a substantially horizontal second hinge axis at a distance from the top frame member and top sash member to provide a plurality of additional open positions in a second operational condition, and
• a sash installation component is provided to support the sash in the second operational condition of the roof window,
• wherein the hinge assembly comprises a coupling unit connected to or connectable to the frame and configured to be connected to the hinge unit in the mounted condition of the roof window, and wherein, in an installation condition of the roof window, the hinge unit is connected to the sash and the coupling unit is connected to the frame, and,
• wherein each coupling unit comprises one top frame coupling plate and one side frame coupling plate, and wherein the coupling unit is configured to allow selective coupling of the frame hinge part of the associated hinge unit to the top frame coupling plate and the side frame coupling plate in the first operational condition, and to only the side frame coupling plate in the second operational condition.