EXTRUDED PLASTIC WINDOW FRAMING

摘要

EXTRUDED PLASTIC WINDOW FRAMING The invention comprises plastic window framing for single or double glazing and single or multiple panes. The frames comprise mullions, glass stops, nailing fins and expansion strips extruded from modified polyolefins that are weather and ultraviolet degradation resistant. The glass stops and expansion strips are co-extruded integral combinations of a hard rigid plastic support and a very flexible sealing portion. Since both the hard rigid portion and the flexible sealing portion of the extrusions are of the same weather and ultraviolet resistant plastic, the plasticizer being the addition for flexibility, the entire framing including the seals can be exposed to the external environment and the mullions can be of relatively simple configuration. The mullions are symmetrical about perpendicular planes longitudinal with the extrusion. The mullions of identical crosssection can be used for vertical and horizontal members of the frame including intermediate mullions between panes. Interior and exterior glass stops are identical in cross-section and can be interchanged and used for both single and double glazing without alteration of the glass stops or mullions. The glass stops engage the mullions along parallel longitudinal engagements. The engagement nearest the glazing features means to snap the glass stop into a slot which may be selected from one of several longitudinal parallel slots in the mullion. A second longitudinal surface on the glass stop, spaced from the slot engagement and opposite from the glazing, rests tightly against the mullion surface and acts as a fulcrum. The glass stop as it is snapped into the first longitudinal slot rotates slightly about the fulcrum and thereby tightly engages the flexible sealing portion of the glass stop against the glazing.