Patent ID: 7389610

Claim:
A door system for use in a high temperature structure having a metal wall portion, the metal wall portion defining a doorway into the high temperature structure, the door system comprising: a metal door frame configured to extend generally about the periphery of the doorway and generally parallel to the metal wall portion of the high temperature structure; said metal door frame defining a plurality of slots therein, said slots each defining weld surfaces configured for allowing said metal door frame to be welded to the doorway; a compressible door for selectively blocking the doorway; a screw configured for causing selective compression of the door upon rotation of said screw in a first direction and selective decompression upon rotation of said screw in a second direction generally opposite to said first direction; said screw having a projection; a bridge spanning substantially across the door; a bearing member attached to said bridge for receiving said screw; at least one arm extending outwardly from the door; at least one cross-member connected to said arm; a guide member for receiving said screw, said guide member being fixed relative to rotation of said screw; connectors readily releasably connecting said guide member to said cross-member; a handle connected to said screw for turning said screw; a fastener for readily releasably connecting said handle to said screw; a debris guard having an elongated portion substantially covering the length of the screw; said debris guard being configured to move with and cover the screw as the screw is rotated; a collar carried on said screw between said projection and said bearing member and configured to bear against said bearing member and said projection upon rotation of said screw in said first direction to compress the door; and said collar being configured to provide a gap of predetermined width between said projection and said bearing member upon rotation of said screw in said second direction to decompress the door.