Abstract: A window frame is made of a plastic material which is secured together by utilization of corner key pieces at each of the four corners joining the header and the sill with a pair of jambs. The corner key pieces may be initially stapled or screwed to the frame members to create a stable unit prior to the permanent securement of the various members by means of ultra-sound welding.
Abstract: A window frame made, for example, of a vinyl material is secured together by the utilization of corner key pieces at each of the four corners joining the header and the sill with a pair of side frames. After the frame pieces have been assembled they are permanently secured by the use of ultra-sound welding.
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