초록 ▼

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. In one embodiment, ends of the blank are secured together by a central tab on one end which exte

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. In one embodiment, 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. In another embodiment, the blank is secured in its folded form by an angle shaped end bracket and the frame is provided with at least one corner bracket forming a gusset. The blanks have inwardly directed flanges which are formed with 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.

대표청구항 ▼

A one piece frame for fire dampers and the like, the frame being of centrally open, generally rectangular shape formed from a folded elongated sheet metal blank which, in its unfolded form, comprises: (a) a longitudinally extending central web portion of planar form (b) side edge portions which are

A one piece frame for fire dampers and the like, the frame being of centrally open, generally rectangular shape formed from a folded elongated sheet metal blank which, in its unfolded form, comprises: (a) a longitudinally extending central web portion of planar form (b) side edge portions which are longitudinally bent so as to define: (i) a pair of longitudinally extending marginal regions of double blank thickness for permitting mounting of the frame in an air duct or the like and; (ii) a pair of longitudinally extending parallel flanges disposed inwardly of said marginal regions and extending perpendicular to and disposed at the same side of the planar web portion, said flanges being divided into sections by V-shaped notches which extend over the entire height of the flange and which are intended to define corners of the completed frame, each section being aligned with sections of the other flange transversely of the blank and extending along a side of the completed frame; (c) a first end portion including two tabs which extend beyond an outer edge of said web portion and which are shaped to define therebetween an open T-shaped slot having a stem portion and a transverse portion, said transverse portion defining part of said outer edge; (d) a second end portion including a central tab shaped to fit through and fold over the transverse portion of the T-shaped slot when the frame is in its folded form and adapted to be folded over to retain the frame in said form, and outer tabs adapted to be folded over said outer edge of the web when the frame is in its folded form; said blank being folded transversely at the positions of said notches with the flanges extending inwardly in forming the frame.