Vertically slidable tiltable sash

Claim 1

IN A STRUCTURE FOR PIVOTALLY AND SLIDABLY SUPPORTING A SASH IN A WINDOW FRAME HAVING A PAIR OF SPACED, SUBSTANTIALLY PARALLEL JAMBS, THE COMBINATION COMPRISING: AN ELONGATED GUIDE MEMBER SECURABLE TO, AND SUSTANTIALLY PARALLEL WITH, ONE OF SAID JAMBS; AN ELONGATED SLIDE MEMBER SLIDABLY SUPPORTED UPON AND PARALLEL WITH SAID GUIDE MEMBER, SAID SLIDE MEMBER BEING SUBSTANTIALLY SHORTER THAN THE GUIDE MEMBER; A HINGE DEVICE MOUNTED UPON SAID SLIDE MEMBER ADJACENT ONE END THEREOF, SAID HINGE DEVICE HAVING MEANS DEFINING AN ARCUATE GRIPPING SURFACE AXIALLY PERPENDICULAR TO SAID SLIDE MEMBER; A TRUNNION ROTATABLY ENGAGED BY SAID GRIPPING SURFACE, MEANS SUPPORTING SAID TRUNNION UPON THE EDGE OF SAID SASH ADJACENT SAID SLIDE MEMBER AND NEAR SAID ONE END THEREOF, SAID SASH BEING PIVOTABLE WITH RESPECT TO SAID FRAME AROUND THE AXIS OF SAID TRUNNION; AND MECHANISM OPERATIVELY ASSOCIATED WITH AND CONNECTED TO SAID HINGE DEVICE AND LOCATED RADIALLY OUTWARDLY OF SAID GRIPPING SURFACE FOR ADJUSTING THE RADIAL PRESSURE BETWEEN SAID TRUNNION AND SAID SURFACE, AND THEREBY CONTROLLING THE ROTATIONAL MOVEMENT OF SAID TRUNNION WITH RESPECT TO SAID HINGE DEVICE, WHEREBY THE PIVOTAL MOVEMENT OF SAID SASH IS CONTROLLED.