Undue heat melts the fusible piece, whereupon the spring closes the shutter. More than one spring can be used. The openings in the body and shutter are rectangular. The fusible piece is formed by two metal plates with adjacent faces joined by a layer of fusible material....
In accordance with a first aspect, a fire shutter adapted to close off an area comprises a shutter curtain movable from an up position to a closed position, wherein the shutter curtain closes off the area when in the closed position, and at least one retractable guide, movable from a retra...
Undue heat melts the fusible piece, whereupon the spring closes the shutter. More than one spring can be used. The openings in the body and shutter are rectangular. The fusible piece is formed by two metal plates with adjacent faces joined by a layer of fusible material....
The shutter can be raised and lowered manually, or with mechanical assistance, as by means of a chain lift or other roll-up/down mechanism for shade and privacy control, but will drop (close) automatically when released by a fusible link of the appropriate temperature setting to provide the ...
The shutter can be raised and lowered manually, or with mechanical assistance, as by means of a chain lift or other roll-up/down mechanism for shade and privacy control, but will drop (close) automatically when released by a fusible link of the appropriate temperature setting to provide the ...
A fire damper of the kind having a folding shutter made up of reversely hinged shutter elements, normally held against a strong spring force, in a compact stack substantially out of the air flow path way, by a substantially rigid fusible link 2 is disclosed. The fusible link 2 has an eye...
Feb. 16. Fire-proof shutters.- Relates to means for controlling and operating rolling fire shutters, and more particularly to locking-means for limiti n g the unwinding movement of the winding barrel or drum, so that the shutter cannot sag down further and bulge out the guidegrooves after ...
The apertures in the flange 19, which slide over the bolts 21, are provided with antifriction sleeves or thimbles. The shutter is normally supported in a hood 9, Fig. 5, by means of a lever 24 pivoted to an ear 26, a lever 25 pivoted to an ear 27, and a fusible link 28 ...
When a fusible link 13 is severed, a spring 11 moves the lever 17, thus releasing the cord 7. The shaft 3 is then free to rotate, and the springs 4 to unwind, thus allowing the shutter to fall by its own weight. In order to check excessive speed as the shutter approaches its ...
A fire and smoke damper 1 comprises a plurality of stainless steel slats 2 each having inturned longitudinal edges for interengaging with the adjacent inturned edges of an adjacent slat 2 to form a folding shutter-type mechanism. Each of the slats 2 is formed with a longitudinally extending ...