Astragal boot

An astragal boot comprising;

• a platform defined by a head portion presenting a straight edge having opposite ends and a base portion having sides narrower than said head portion extending from said straight edge along an axis perpendicular to said straight edge to a curved distal extremity,
• said platform defining a hole spaced from said straight edge and from said distal extremity,
• a first projection projecting upwardly from said head portion of said platform and a second projection spaced from said first projection projecting upwardly from said base portion of said platform,
• a head fin being flexible and projecting downwardly from said platform along and between said opposite ends of said straight edge of said head portion of said platform,
• a skirt projecting downwardly from said head portion of said platform and extending around said head portion complementary to said head fin between said opposite ends of said straight edge of said head portion,
• a plurality of base fins being flexible and projecting downwardly from said base portion of said platform,
• said plurality of base fins including a curved fin joined to and extending across said curved distal extremity of said base portion and between said sides of said base portion,
• said plurality of base fins including a pair of spaced lateral fins extending from said curved fin along said sides of said base portion,
• a plurality of primary fins being flexible and projecting downwardly from said platform a greater distance than said base fins and joined to and extending between said lateral fins in parallel relationship with said head fin,
• said plurality of primary fins including a first primary fin spaced from said head fin to define a channel between said first primary fin and said head fin,
• said plurality of fins including a second primary fin in spaced relationship to said first primary fin,
• said plurality of fins including a third primary fin in spaced relationship to said second primary fin,
• whereby said first projection and said second projection are engageable with a profile defined by a lower end of an astragal to retain said astragal boot to the lower end of the astragal disposed at a free end of a semi-active door in a double door set disposed over a threshold for sliding a lock bolt through said hole to secure the semi-active door in a closed position and for receiving door sweeps adjacent each said sides of said base portion with said head fin in parallel and overlapping sealing engagement with the door sweeps and flexed against the threshold and into said channel when said head fin passes over the threshold and said base fins are in sealing engagement with the threshold and said plurality of primary fins flex against the threshold to form a first cavity between said lateral fins and said first primary fin and said second primary fin and said platform for disposition over the threshold and to form a second cavity between said lateral fins and said second primary fin and said third primary fin and said platform for disposition over the threshold.

An astragal assembly for disposition on a free end of a semi-active door in a double-door set disposed over a threshold, said astragal assembly comprising;

• an astragal presenting a lower end proximal to the threshold and walls extending upwardly from said lower end defining a profile,
• an astragal boot including a platform and a plurality of projections complementary to said profile projecting upwardly from said platform in engagement with said walls,
• said astragal boot including a pair of spaced lateral fins being flexible and projecting downwardly from said platform for sealing engagement with the threshold,
• said astragal boot including a first primary fin being flexible and projecting downwardly from said platform a greater distance than said lateral fins and directly joined to and extending between said lateral fins for flexing against the threshold in sealing engagement with the threshold to form a cavity between said lateral fins and said first primary fin and said platform for disposition over the threshold, and
• said astragal boot includes a second primary fin disposed in said cavity and being flexible and projecting downwardly from said platform a greater distance than said lateral fins and directly joined to and extending between said lateral fins in said cavity in spaced relationship to said first primary fin.