Sliding door threshold sensor
First Claim
1. A safety sensor for a sliding door system of a type wherein an automatic operator is at least partially responsive to an operate signal for initiating the operation of a sliding door which is transversely moveable across a threshold having opposing entrance and exit sides for selectively opening and closing an entranceway comprising:
- detection zone means comprising a plurality of infrared transmitters energizable for emitting infrared radiation to define a detection zone which substantially encompasses a region above the threshold and the threshold vicinity at the opposing sides of the threshold;
synchronization means for synchronizing the operation of said sensor with an alternating current line frequency;
pulsing means responsive to said synchronization means for sequentially pulsing said transmitters in a series of time spaced pre-established pulse intervals;
receiver means for receiving reflected infrared radiation from said detection zone and generating a corresponding electrical detection signal;
verification means responsive to said detection signal for determining whether an object is present in said detection zone;
operate input means for supplying a signal indicative of the status of the operate signal;
circuit means including a latch circuit selectively actuatable between unlatched and latched states, said circuit means being responsive to said verification means and said operate input means for activating said latch circuit to the latched state in the event that an object is present in the detection zone and said operate signal is present; and
safety signal means responsive to the latched state of said circuit means for generating a hold open output.
1 Assignment
0 Petitions
Accused Products
Abstract
A threshold safety sensor for a sliding door system employs infrared transmitters and a photo diode for detecting traffic at or near the threshold of a sliding door system. The transmitters are pulsed in a time spaced sequence. An input signal derived from the operate initiating signal of the automatic door operator is employed for enabling a latch. The latch sets a relay to a state for maintaining the doors in an open position when traffic is detected in the sensor detection zone.
82 Citations
21 Claims
-
1. A safety sensor for a sliding door system of a type wherein an automatic operator is at least partially responsive to an operate signal for initiating the operation of a sliding door which is transversely moveable across a threshold having opposing entrance and exit sides for selectively opening and closing an entranceway comprising:
-
detection zone means comprising a plurality of infrared transmitters energizable for emitting infrared radiation to define a detection zone which substantially encompasses a region above the threshold and the threshold vicinity at the opposing sides of the threshold; synchronization means for synchronizing the operation of said sensor with an alternating current line frequency; pulsing means responsive to said synchronization means for sequentially pulsing said transmitters in a series of time spaced pre-established pulse intervals; receiver means for receiving reflected infrared radiation from said detection zone and generating a corresponding electrical detection signal; verification means responsive to said detection signal for determining whether an object is present in said detection zone; operate input means for supplying a signal indicative of the status of the operate signal; circuit means including a latch circuit selectively actuatable between unlatched and latched states, said circuit means being responsive to said verification means and said operate input means for activating said latch circuit to the latched state in the event that an object is present in the detection zone and said operate signal is present; and safety signal means responsive to the latched state of said circuit means for generating a hold open output. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A safety sensor for a sliding door system of a type wherein an automatic operator is at least partially responsive to an operate signal for initiating the operation of a sliding door which is transversely moveable across a threshold having opposing entrance and exit sides for selectively opening and closing an entranceway comprising:
-
housing means for mounting above the threshold; detection zone means comprising a plurality of infrared transmitters mounted in said housing means and energizable for emitting infrared radiation to define a detection zone which substantially encompasses a region above the threshold and the threshold vicinity at the opposing sides of the threshold; synchronization means for synchronizing the operation of said sensor with an alternating current line frequency; pulsing means responsive to said synchronization means for sequentially pulsing said transmitters in a series of time spaced pre-established pulse intervals; receiver means mounted in said housing means for receiving reflected infrared radiation from said detection zone and generating a corresponding electrical detection signal; operate input means having a low and a high state for supplying a signal indicative of the status of said operate signal; verification means responsive to said detection signal for determining whether an object is present in said detection zone, said pulsing means, said receiver means and said verification means being generally continuously operable regardless of the state of the operate input means; circuit means including a latch circuit selectively actuatable between unlatched and latched states, said circuit means being responsive to said verification means and enabled by said operate input means for activating said latch circuit to the latched state in the event that an object is present in the detection zone and said operate signal is present; and safety signal means responsive to the latched state of said circuit means for generating a hold open output. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
-
-
15. A safety sensor for a sliding door system of a type wherein an automatic operator is at least partially responsive to an operate signal for initiating the operation of a sliding door which is transversely moveable across a threshold having opposing entrance and exit sides for selectively opening and closing an entranceway comprising:
-
detection zone means comprising a plurality of infrared transmitters energizeable for emitting infrared radiation to define a detection zone which substantially encompasses a region above the threshold and the threshold vicinity at the opposing sides of the threshold; synchronization means for synchronizing the operation of said sensor with an alternating current line frequency; pulsing means responsive to said synchronization means for sequentially pulsing said transmitters in a series of time spaced pre-established pulse intervals; receiver means for receiving reflected infrared radiation from said detection zone and generating a corresponding electrical detection signal; verification means responsive to said detection signal for determining whether an object is present in said detection zone, said verification means comprising counter means for counting pulses and phase select means for selecting pulses having a pre-established phase relationship with the radiation transmitted by said transmitter; operate input means for supplying a signal indicative of the status of the operate signal; circuit means including a latch circuit selectively actuatable between unlatched and latched states, said circuit means being responsive to said verification means and said operate input means for activating said latch circuit to the latched state in the event that an object is present in the detection zone and said operate signal is present; and safety signal means responsive to the latched state of said circuit means for generating a hold open output. - View Dependent Claims (16, 17, 18, 19, 20)
-
-
21. A safety sensor for a sliding door system of a type wherein an automatic operator is at least partially responsive to an operate signal for initiating the operation of a sliding door which is transversely moveable across a threshold having opposing entrance and exit sides for selectively opening and closing an entranceway comprising:
-
detection zone means comprising a plurality of infrared transmitters energizeable for emitting infrared radiation to define a detection zone which substantially encompasses a region above the threshold and the threshold vicinity at the opposing sides of the threshold; synchronization means for synchronizing the operation of said sensor with an alternating current line frequency; pulsing means responsive to said synchronization means for sequentially pulsing said transmitters in a series of time spaced pre-established pulse intervals; receiver means for receiving reflected infrared radiation from said detection zone and generating a corresponding electrical detection signal; verification means responsive to said detection signal for determining whether an object is present in said detection zone; operate input means for supplying a signal indicative of the status of the operate signal; circuit means including a latch circuit selectively actuatable between unlatched and latched states, said circuit means being responsive to said verification means and said operate input means for activating said latch circuit to the latched state in the event that an object is present in the detection zone and said operate signal is present; safety signal means responsive to the latched state of said circuit means for generating a hold open output; and switch means having two states for selectively synchronizing the operation of the sensor at one of two 180°
phase spaced relationships.
-
Specification