Ancillary double glazing panels with frame profile - providing hinge coupling for ease of opening or removal

摘要

The parent patent described ancillary glazing based on use of an extruded PVC frame profile clamped within an existing window opening and having a deep external seal of expanded polyethylene to ensure a draught proof fit against the surrounding surfaces. This addn. describes a modified design in which the ancillary glazing is of safety glass and as two panes of which the lower one is fixed and the upper one can open 'French' style. The two panes are sepd. by a crossbar profile. The pivoting pane is mounted in a subframe with a radiused rib sized to be a snap fit into a 135 deg channel on the main frame to act as a full width hinge and peripheral seal. The ancillary pane can be removed for warm weather without disturbing the main frame.