Door with automatic fire restricting system

Claim 2

In combination with a closure device and power operating means for closing and opening the closure device, signal triggered logic means connected to the power operating mechanism for only closing the closure device during a warning period, and timer-controlled means connected to the power operating means for repeatedly opening and closing the closure device during an evacuation period following the warning period, said closure device being installed in an access passageway to an enclosed space, fire detecting means mounted within said space for triggering the logic means, and fire extinguishing means mounted within said space for operation in response to sealing of the space by the closure device upon termination of the evacuation period.

Claim 3

The combination of claim 1 including a source of electrical energy for energizing the power operating mechanism, load sensing switch means connecting the source to the power operating mechanism for energization thereof below overload conditions, and load control means connected to the switch means for preventing disconnection of source from the power operating mechanism in response to overload conditions during the evacuation period.

Claim 4

The combination of claim 2 wherein the logic means includes a pair of control logic devices connected to the power operating mechanism for respectively effecting closing and opening of the closure device, pulse generating means connected to one of the control logic devices for periodically triggering closing operation of the closure device during said warning period and disable means connected to the control logic devices and the load control means for initially rendering the switch means insensitive to overload conditions upon triggering of said operation of the closure device.

Claim 5

The combination of claim 3 wherein the power operating mechanism includes a motor connected in series with the switch means to the source, and electrically operated clutch means disengaging the motor in response to opening of the switch means.

Claim 6

The combination of claim 4 wherein said switch means includes a triac having a gate and relay means for supplying trigger voltage to the gate in response to energization of the power operating mechanism to prevent the triac from switching off under the overload conditions.

Claim 7

The combination of claim 5 wherein said load control means includes adjustable means for disabling the relay means during said evacuation period.

Claim 8

The combination of claim 6 wherein said timer-controlled means includes gate means for simultaneously disconnecting the pulse generating means from said one of the control logic devices and supplying a triggering signal to the other of the control logic devices.

Claim 9

In combination with a closure device and power operating means for closing and opening the closure device, signal triggered logic means connected to the power operating mechanism for only closing the closure device during a warning period, timer-controlled means connected to the power operating means for repeatedly opening and closing the closure device during an evacuation period following the warning period, a source of electrical energy for enerGizing the power operating mechanism, load sensing switch means connecting the source to the power operating means for energization thereof below overload conditions, and load control means connected to the switch means for preventing disconnection of the source from the power operating mechanism in response to overload conditions during the evacuation period.

Claim 10

In combination with a closure device and power operating means for closing and opening the closure device, signal triggered logic means connected to the power operating mechanism for only closing the closure device during a warning period, timer-controlled means connected to the power operating means for repeatedly opening and closing the closure device during an evacuation period following the warning period, a source of electrical energy for enerGizing the power operating mechanism, load sensing switch means connecting the source to the power operating means for energization thereof below overload conditions, and load control means connected to the switch means for preventing disconnection of the source from the power operating mechanism in response to overload conditions during the evacuation period.

Claim 11

The combination of claim 8 wherein said switch means includes a triac having a gate and relay means for supplying trigger voltage to the gate in response to energization of the power operating mechanism to prevent the triac from switching off under the overload conditions.

Claim 12

The combination of claim 9 wherein said load control means includes adjustable means for disabling the relay means during said evacuation period.

Claim 13

The combination of claim 8 wherein the logic means includes a pair of control logic devices connected to the power operating mechanism for respectively effecting closing and opening of the closure device, pulse generating means connected to one of the control logic devices for periodically triggering closing operation of the closure device during said warning period and disable means connected to the control logic devices and the load control means for initially rendering the switch means insensitive to overload conditions upon triggering of said operation of the closure device.

Claim 14

The combination of claim 11 wherein said timer-controlled means includes gate means for simultaneously disconnecting the pulse generating means from said one of the control logic devices and supplying a triggering signal to the other of the control logic devices.

Claim 15

In combination with a closure device and a power operating mechanism for closing and opening the closure device, a sensor, logic means connected to the sensor and the power operating mechanism for closing the closure device during a warning period in response to detection of a predetermined condition by said sensor, and timer-controlled means connected to the logic means and rendered operative upon closing of the closure device for repeatedly opening and closing the closure device during an evacuation period following the warning period, said logic means including a control logic device for effecting closing operation of the closure device, drive control means connecting the control logic device to the power operating mechanism for periodically initiating said closing operation during the warning period, overload sensing means for momentarily disabling the power operating mechanism in response to excessive loading of the closure device during said closing operation, and means for disabling the overload sensing means during the evacuation period.

Claim 16

In combination with a closure device and a power operating mechanism for closing and opening the closure device, a sensor, logic means connected to the sensor and the power operating mechanism for closing the closure device during a warning period in response to detection of a predetermined condition by said sensor, and timer-controlled means connected to the logic means and rendered operative upon closing of the closure device for repeatedly opening and closing the closure device during an evacuation period following the warning period, said logic means including a control logic device for effecting closing operation of the closure device, drive control means connecting the control logic device to the power operating mechanism for periodically initiating said closing operation during the warning period, overload sensing means for momentarily disabling the power operating mechanism in response to excessive loading of the closure device during said closing operation, and means for disabling the overload sensing means during the evacuation period.