Abstract A closure structure for disposition over a window in the wall of an air duct is provided to allow access into the duct. A rectangular frame member is positioned to surround the window in the air duct and is secured along the perimeter of the window by a plurality of flanges which project from the frame transversely of the wall. Each of the flanges has a line of weakness proximal the wall and is manually bendable along this line to a position contiguous the wall to secure the frame member. The two flanges located adjacent each corner of the frame member comprise starter tabs which have substantially less resistance to deformation along their respective lines of weakness than the other flanges thus allowing the frame member to be held in place relative to the wall while the starter tabs are bent into position to hold the frame in place. The remaining flanges may then be bent into place to securely and permanently hold the frame member. An elongated hinge pin is telescopically received by the frame member and the door for mounting the door for swinging movement relative to the frame member. This pin is removable from the frame by simply pulling upwardly to thereby remove the door. This allows greater access to the duct.
Closure structure to be disposed over and secured along the perimeter of a window in a wall for providing access to the other side of the wall, said structure comprising: a frame member adapted to be positioned to surround said window on one side of said wall; a door coupled with the frame member and movable with respect to the latter between an open and a closed position; lock means for holding said door tightly against said frame member; a plurality of flanges integral with said frame member and projecting from the latter on the other side of said wall when the frame member is in position, said flanges being characterized by a plurality of perforations disposed in linear alignment with each other and substantially aligned with said other side of the wall and interrupted by a plurality of integral portions of said flanges disposed between adjacent perforations, said flanges being manually bendable through an arc of approximately 90* along the line presented by said perforations to a position in contact with said wall on said other side thereof; a first sealing strip secured to said frame member for forming a seal between the member and said one side of said wall; and a second sealing strip secured to said frame member for forming a seal between said door and the frame member.
Claim 2
Dependent Claim
223 words
Closure structure to be disposed over and secured along the perimeter of a window in a wall for providing access to the other side of the wall, said structure comprising: a frame member adapted to be positioned to surround said window on one side of said wall; a door coupled with the frame member and movable with respect to the latter between an open and a closed position; lock means for holding said door tightly against said frame member; a plurality of flanges integral with said frame member and projecting from the latter on the other side of said wall when the frame member is in position, said flanges being characterized by a plurality of perforations disposed in linear alignment with each other and substantially aligned with said other side of the wall and interrupted by a plurality of integral portions of said flanges disposed between adjacent perforations, said flanges being manually bendable through an arc of approximately 90* along the line presented by said perforations to a position in contact with said wall on said other side thereof; a first sealing strip secured to said frame member for forming a seal between the member and said one side of said wall; and a second sealing strip secured to said frame member for forming a seal between said door and the frame member.
Claim 3
Dependent Claim
51 words
The invention of claim 1, including an elongated hinge pin telescopically received by the frame member and the door for mounting the door for swinging movement relative to the frame member, said pin being removable from the frame whereby said door is also removable to provide greater access through the window.
Claim 4
Dependent Claim
20 words
The invention of claim 1, wherein said door comprises a non-transparent panel and including an insulating layer for said door.
Claim 5
Dependent Claim
12 words
The invention of claim 1, wherein said door comprises a transparent panel.
Claim 6
Dependent Claim
83 words
The invention of claim 1, wherein at least two of said flanges comprise starter tabs disposed at opposed points on said frame, each of said starter tabs having less resistance to deformation along its line of perforations than the other flanges whereby the starter tabs may be easily bent into position as the frame member is manually held in place realtive to the wall to position the frame member, and the remaining flanges bent into position to secure said member to the wall.