Fire damper frame

Details Fire damper frame Fire damper frame

F - Mech Eng,Light,Heat,Weapons

23

L

98/53

F23L 13/00 (2006.01) A62C 2/12 (2006.01)

Patent

CA 1127443

ABSTRACT OF DISCLOSURE The disclosure relates to one piece frames for fire dampers and the like. The frames are formed from elongate sheet metal blanks each of which is folded into a centrally open, generally rectangular form. Ends of the blank are secured together by a central tab on one end which extends through a T-shaped slot formed at the opposite end of the blank. The blanks have inwardly directed flanges which are formed with a V-shaped notches to permit folding of the blank. In one embodiment, the notches each define an angle of less than 90° and portions of the flange on each side of the notch are overlapped when the blank is folded to provide for frictional engagement between the overlapped portions. In another embodiment, the notches each define an angle of 90° so that the edges of the flange at opposite sides of the notch come into abutting relationship when the blank is folded.

340480

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