US Patent 10472872 Window that can both slide open and pivot open

Conventional UPVC windows have casements which are pivotable and movable in a limited manner relative to the frame. It is desirable to be to move all the casements such that substantially the entire the frame is opened. This is achieved by providing a window (10) comprising a frame (20) including a head (22), a sill (24), the window further comprising at least first and second casements, wherein the first casement includes hinges (50) for rotating it relative to the frame, the hinges being movable relative to the frame along channels (120) provided in the sill and head such that the first casement is slidable within the frame, the first casement also including at least one guide (52) located on the upper and/or lower surface of the first casement distal from the hinges and movable within the respective head or sill channel as the first casement slides relative to the frame, the said at least one guide disengagable from the respective head or sill channel allowing the at least one guide to pass out of the respective channel thus allowing the first casement to be opened relative to the frame, the sill including a runner (140) on which the casement is slidable. In this way the first casement may be stacked adjacent the second casement at one end of the window frame after both have been pivoted open.