Automatic door bottom

An automatic door bottom for a hinged door which is pivotable to be positioned over a sill when closed, the door having a hinge side and a width, said door bottom comprising:

• a sealing member having a length corresponding to the width of said door bottom;
• a movable member positionable to be actuated by the closing of the door;
• a plurality of springs positonable adjacent the bottom of the door and coupled to said movable member having a first plurality of elements in sliding abutment against said sealing member and a second plurality of elements in sliding abutment toward said door so that said plurality of springs flex and engage said sealing member as said movable member is actuated thereby to cause said sealing member to move into a sealing position relative to the sill when the door is closed;
• and
• wherein each of said plurality of springs has a resistance to flexing and wherein a first spring of said plurality of springs closest to the hinge side of the door has a lower resistance to flexing than each other one of said plurality of springs.

An automatic door bottom for a hinged door which is pivotable to be positioned over a sill when closed, the door having a hinge side and a width, said door bottom comprising:

• a case having an inverted channel having an open bottom, a length corresponding to the door bottom width and a hinge end corresponding to the hinge side of the door;
• a sealing member having a length corresponding to the length of said channel, said sealing member being housed in said channel and being movable vertically downwardly into a sealing position in which said sealing member is positionable so that it will contact the sill when the door is closed;
• a displacement mechanism comprising plural resilient members of different spring stiffnesses installed in said channel and coupled to said sealing member for moving said sealing member into the sealing position in response to closing of the door, wherein
• said displacement mechanism is slidably coupled to said sealing member at a first plurality of points along the length of said sealing member and slidably coupled toward said door at a second plurality of points along the length thereof and is operative to move the end of said sealing member at said hinge side of said channel into the sealing position prior to the remainder of said sealing member during closing of the door.