Fire door operator having an integrated electronically controlled descent device
First Claim
Patent Images
1. An operator for operating a fire door, the fire door having a drive shaft, comprising:
- a motor having an output shaft coupled to the drive shaft;
a brake for holding the fire door in an open or a closed condition;
an electronically controlled descent device comprising;
a DC solenoid for engaging and disengaging the brake;
a speed sensor for detecting a descent speed of the fire door; and
an electronic controller, responsive to the speed sensor, selectively enabling the DC solenoid when the descent speed reaches a predetermined minimum speed and disabling the DC solenoid when the descent speed reaches a predetermined maximum speed;
a limit shaft coupled to the output shaft for setting open limit and closed limit positions; and
a DC power source for providing power to the electronically controlled descent device.
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Accused Products
Abstract
A fire door opener and method of electronically controlling the door descent speed is described. The operator includes a DC brake solenoid coupled to an AC motor drive system with an inline gear reducer and an electronically controlled descent device with battery backup power. If the brake is disengaged, the door will drop by overcoming the internal inertia and friction in the inline gear reducer. Speed of descent is controlled electronically by measuring the descent speed of the fire door at its limit shaft and electrically modulating the brake engagement using the DC solenoid.
112 Citations
13 Claims
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1. An operator for operating a fire door, the fire door having a drive shaft, comprising:
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a motor having an output shaft coupled to the drive shaft; a brake for holding the fire door in an open or a closed condition; an electronically controlled descent device comprising; a DC solenoid for engaging and disengaging the brake; a speed sensor for detecting a descent speed of the fire door; and an electronic controller, responsive to the speed sensor, selectively enabling the DC solenoid when the descent speed reaches a predetermined minimum speed and disabling the DC solenoid when the descent speed reaches a predetermined maximum speed; a limit shaft coupled to the output shaft for setting open limit and closed limit positions; and a DC power source for providing power to the electronically controlled descent device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An operator for operating a fire door, the fire door having a drive shaft, comprising:
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a motor having an output shaft coupled to the drive shaft; a brake for holding the fire door in an open or a closed condition; an electronically controlled descent device comprising; a DC solenoid for engaging and disengaging the brake; a speed sensor for detecting a descent speed of the fire door; and an electronic controller, responsive to the speed sensor, selectively enabling the DC solenoid when the descent speed reaches a predetermined minimum speed and disabling the DC solenoid when the descent speed reaches a predetermined maximum speed; a DC power source for providing power to the electronically controlled descent device; time delay circuitry for delaying descent of the fire door a time delay period after receipt of an alarm signal; and apparatus for adjusting the time delay period.
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13. An operator for operating a fire door, the fire door having a drive shaft, comprising:
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a motor having an output shaft coupled to the drive shaft; a brake for holding the fire door in an open or a closed condition;
an electronically controlled descent device comprising;a DC solenoid for engaging and disengaging the brake; a speed sensor for detecting a descent speed of the fire door; and an electronic controller, responsive to the speed sensor, selectively enabling the DC solenoid when the descent speed reaches a predetermined minimum speed and disabling the DC solenoid when the descent speed reaches a predetermined maximum speed; a DC power source for providing power to the electronically controlled descent device; and circuitry for selecting an alarm contact type of an external alarm system for sending an alarm close command to the operator.
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Specification