Upwardly acting door assembly

Claim 1

A VERTICALLY ACTING DOOR ASSEMBLY COMPRISING FRAME MEMBERS PROVIDED WITH INWARDLY FACING JAMB SEALS, A DOOR COMPRISING A PLURALITY OF HORIZONTALLY ARTICULTED SECTIONS, TRACK SUPPORT MEMBERS MOUNTED ON SAID DOOR FRAME MEMBERS IN SPACED RELATION TO THE JAMB SEALS THEREOF, TRACKS COMPRISING UPRIGHT SECTIONS SWINGABLY MOUNTED AT THEIR UPPER ENDS ON SAID TRACK SUPPORT MEMBERS, SAID DOOR SECTIONS BEING PROVIDED WITH ROLLERS COACTING WITH SAID TRACK INCLUDING ROLLERS DISPOSED ADJACENT THE LOWER EDGE OF THE BOTTOM DOOR SECTION, SAID TRACK SUPPORTS AND UPRIGHT TRACK SECTIONS HAVING REARWARDLY FACING RECESSES AT THEIR LOWER ENDS, THRUST MEMBER BRACKETS OF OUTWARDLY FACING CHANNEL SECTION MOUNTED ON THE LOWER ENDS OF SAID SUPPORT MEMBERS AT THE REAR OF THE RECESSED ENDS OF SAID TRACK SECTIONS, DOWNWARDLY AND FORWARDLY INCLINED THRUST MEMBER PIVOTALLY MOUNTED ON SAID BRACKETS REARWARDLY OF SAID RECESSED ENDS OF SAID TRACK SECTIONS, SAID BRACKETS HAVING VERTICAL SLOTS IN THE WEBS THEREOF, ABUTMENTS FOR SAID THRUST MEMBERS PROVIDED WITH SUPPORTING BOLTS ADJUSTABLY ENGAGING SAID SLOTS IN SAID BRACKETS, AND SPRINGS ACTING TO BIAS SAID TRACK SECTIONS REARWARDLY.