Patent ID: 8651164

Claim:
A method for providing vertical acting egress and fire and smoke protection using an overhead coiling door comprising the steps of: power closing the door to a closed position upon entering an alarm state; while still in the alarm state power opening the door to a pre-established emergency egress height upon activation of an egress device, pausing for a pre-established period of time, and reclosing; and returning to a fully open position once the alarm state ends; wherein the door is powered by an operator powered by a self-contained power cell and an additional operator logic having a normal power cell condition, a Level 1 low power cell condition, a Level 2 low power cell condition, and a Level 3 low power cell condition; wherein the Level 1 low power cell condition comprises a power cell condition below the normal power cell condition wherein the operator functions as if in the normal power cell condition; the Level 2 low power cell condition comprises a power cell condition below the Level 1 low power cell condition wherein the door power closes when in the alarm state; and power operates to the emergency egress height upon activation of the egress device pauses for a pre-established period of time, and recloses while still in the alarm state; the Level 3 low power cell condition comprises a power cell condition below the Level 2 low power cell condition wherein the operator moves the door to the emergency egress height and releases an operator clutch and motor drive, wherein a preset counter balance operatively connected to the door balances the door at the emergency egress height; and wherein upon activation of a predetermined temperature high temperature limit trip sensor, prevents power operation and releases spring tension moving the door to a fully closed position by gravity; wherein the operator reengages the clutch and motor drive when the power cell returns to a normal power cell condition and the predetermined temperature high temperature limit trip sensor did not activate; and wherein spring tension is released by a spring release mechanism comprising: a first sprocket rotationally fixed to a shaft arising from an inner bracket; a governor comprising a second sprocket rotationally fixed to the governor and operatively engaging the first sprocket, the governor operatively engaged by a first ratcheting pawl attached to the inner bracket; an outer bracket attached to the inner bracket; a dropout pawl attached to the outer bracket comprising a pin/swing arm engagement area; a swing arm stop attached to the outer bracket comprising a channel to allow pass through of a pin; a shaft operatively connected to the first sprocket extending through an outer bracket orifice to rotationally receive a swing arm, the swing arm rotationally restricted by engagement with the dropout pawl pin and swing arm engagement area; and a tensioned adjusting wheel rotatively engaged to the shaft comprising a plurality of receptacles to receive the pin.