Fusible Links

Globe Technologies Corporation - The World's leading manufacturer of high quality fusible links used in the fire protection industry. It is another object of the present invention to provide a novel motorized smoke and fire damper incorporating cable means which are continuously tensioned by a motor to normally retain the damper blade assembly in an open condition and which automatically acts to release the blade assembly upon de-energization of the motor.
The step spindle 52 is pinned or otherwise conventionally affixed to the shaft 50 and rotates as the shaft is rotated by function of the motor 42. Rotation of the spindle 52 winds the first spring 66 by means of its connected inner end 64 and the seated outerwardly turned end 68. Winding of the first spring 66 upon operation of the elsie fusible links motor 42 results in a decrease in spring diameter which causes the spring body to grip the inwardly directed hub 88 of the pulley 86. The greater the turning moment caused by the motor shaft 50, the tighter the spring will lock upon the pulley hub 88 to rotate the pulley to a stall position and to lock the pulley in this position.

The main difference between the two designs is dynamic dampers (in most cases) utilize springs to pull the curtain closed against the air pressure and velocity while static dampers rely solely upon gravity to pull the curtain closed (static dampers designed for floor installation utilize closure springs).
4 and 5, the cable 96 has one end connected to the pulley 86 at the connecting holes 98, 98' and has its other end connected to the fusible link 102 below the lowest blade 38. The cable 96 terminates in an S-link 100 and the other end of the link 100 is attached to a fusible element 102 by a suitable metallic strap 103.
Fire dampers shall be installed in wall or floor openings utilizing steel mounted sleeves, angles, other materials and practices required to satisfy the Australian and N.Z. Building Code, and A.S.1682 Parts I & II, and as shown in the manufacturers instructions.

Working Fire Dampers are essential when it comes to stopping the smoke from spreading throughout a building and saving lives, we offer extensive testing services to ensure the Fire Dampers you have in your building will work correctly in the event of a fire.
5. The smoke and fire damper of claim 3 wherein the initial diameter of the first spring is great enough to permit the hub of the pulley to slip relative to the untensioned first spring when the cable tensioning means is functioned to its said second position.