초록 ▼

In the entranceway between an elevator car and a floor are two oppositely sliding doors. The approach of these doors is controlled by a detection system that senses the presence of objects between the doors. This system includes, on each door, a plurality of emitters which are vertically spaced apar

In the entranceway between an elevator car and a floor are two oppositely sliding doors. The approach of these doors is controlled by a detection system that senses the presence of objects between the doors. This system includes, on each door, a plurality of emitters which are vertically spaced apart the door edge, for radiating noncollimated light towards the edge of the other door. At the top and bottom portions of each door edge there is a sensor which can receive the radiation from the emitters on the other door edge. The emitters on each door edge are sequentially turned on and the sensors on the opposite door edge provide a corresponding signal as they are turned on, unless an obstruction is in the way, causing the detection system to generate a signal that thus indicates that an object is between the doors.

대표청구항 ▼

A method for detecting the presence of an object in the path of a closing sliding door, characterized by: sequentially activating energy transmitters as the door closes, to transmit energy between vertically spaced apart points along one of the two vertical edges of the area closed by the door to a

A method for detecting the presence of an object in the path of a closing sliding door, characterized by: sequentially activating energy transmitters as the door closes, to transmit energy between vertically spaced apart points along one of the two vertical edges of the area closed by the door to a detector on the second of said edges, an imaginary line between the detector and each transmitter decreasing as the door closes and being at an angle greater than 0 but less than 90 degrees to the direction in which the door slides; sensing the transmitted energy with the detector for producing an output signal in response to the energy; sensing the output from the detector when the energy is transmitted from each energy transmitter and providing a door stop signal when there is no output from the detector when each energy transmitter is activated.