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Claim 1

IN A DOUBLE HUNG WINDOW, A FRAME COMPRISING A SILL, SIDE JAMBS AND A HEAD JAMB, UPPER AND LOWER SASHES SLIDABLE VERTICALLY WITH RESPECT TO SAID SIDE JAMBS, MEANS FOR SLIDABLY MOUNTING SAID SASHES RELATIVE TO SAID SIDE JAMBS COMPRISING JAMB LINERS, ONE FOR EACH SIDE JAMB, AND MEANS BIASING SAID LINERS AWAY FROM SAID SIDE JAMBS AND INTO CONTACT WITH SAID SASHERS, SAID JAMB LINERS COMPRISING MEMBERS OF UNDULANT SHAPE EXTENDING THROUGHOUT THE HEIGHT OF SAID SIDE JAMBS AND EACH HAVING A PAIR OF LONGITUDINALLY EXTENDING SASH BEADS TO CONTACT EACH SASH, AN OPPOSITELY EXTENDING SPRING BEAD SUBSTANTIASLLY MIDWAY BETWEEN EACH OF SAID PAIR OF SASH BEADS AND A CONNECTING WEB BETWEEN THE INNER TWO BEADS OF EACH PAIR OF SASH, BEADS, SAID JAMB LINERS BEING FORMED OF STIFF BUT RESILIENT PLASTIC MATERIAL, SAID BIASING MEANS COMPRISING LEAF SPRINGS EXTENDING THROUGHOUT THE HEIGHT OF SAID SIDE JAMBS, EACH LEAF SPRING COMPRISING A PAIR OF WINGS, ONE ENGAGING EACH OF SAID SPRING BEADS AND THEREBY EXERTING SUBSTANTIALLY EQUAL PRESSURE THROUGH SAID SASH BEADS AGAINST SAID SASH, AND MEANS FOR SECURING THE CENTER PORTIONS OF SAID LEAF SPRING TO SAID SIDE JAMBS.