Safety arrangement of an elevator having sensors limiting extent of elevator travel
First Claim
1. A safety arrangement of an elevator, which elevator comprising an elevator control system, an elevator motor, a power supply circuit of the elevator motor as well as at least one mechanical stopping appliance for preventing movement of the elevator car, the safety arrangement comprising:
- a measuring arrangement for monitoring the safety spaces of the elevator;
a control unit;
a first data transfer channel between the said measuring arrangement and the control unit;
a second data transfer channel between the elevator control system and the control unit;
wherein the measuring arrangement for monitoring the safety spaces of the elevator comprises;
normal drive limit switches in an upper part and a lower part of an elevator shaft for setting the end limits of movement of the elevator car in normal drive,service space limit switches in the upper part and the lower part of the elevator shaft for setting service spaces in the elevator shaft, which service space limit switches are situated farther from the ends of the elevator shaft than the normal drive limit switches,wherein the measuring arrangement for monitoring the safety spaces of the elevator comprises service drive sensors in the upper part and the lower part of the elevator shaft for setting the end limits of movement of the elevator car in service drive permitted mode, which service drive sensors are situated farther from the ends of the elevator shaft than the service space limit switches, andwherein the control unit stops the elevator car by controlling the mechanical stopping appliance when the elevator car reaches the service drive sensors and then permits the elevator control system to start another run, the control unit switching to a drive prevented mode if the elevator car reaches a service space limit switch, anda manually operated return appliance to cancel the drive prevented mode.
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Accused Products
Abstract
The invention relates to a safety arrangement of an elevator and a method for implementing safety spaces in an elevator shaft. The elevator has an elevator control system, an elevator motor, a power supply circuit of the elevator motor, and at least one mechanical stopping appliance for preventing movement of the elevator car in the elevator shaft. In the method according to the invention information is read with the control unit from the sensors that measure the position of the landing door of the elevator and possibly information is read from the sensors that measure the position of the door of the elevator car. If it is detected that more landing doors than the door of the elevator car are open, the control unit is switched to the person in the elevator shaft mode and information about the person in the elevator shaft mode is sent with the control unit to the elevator control system.
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Citations
30 Claims
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1. A safety arrangement of an elevator, which elevator comprising an elevator control system, an elevator motor, a power supply circuit of the elevator motor as well as at least one mechanical stopping appliance for preventing movement of the elevator car, the safety arrangement comprising:
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a measuring arrangement for monitoring the safety spaces of the elevator; a control unit; a first data transfer channel between the said measuring arrangement and the control unit; a second data transfer channel between the elevator control system and the control unit; wherein the measuring arrangement for monitoring the safety spaces of the elevator comprises; normal drive limit switches in an upper part and a lower part of an elevator shaft for setting the end limits of movement of the elevator car in normal drive, service space limit switches in the upper part and the lower part of the elevator shaft for setting service spaces in the elevator shaft, which service space limit switches are situated farther from the ends of the elevator shaft than the normal drive limit switches, wherein the measuring arrangement for monitoring the safety spaces of the elevator comprises service drive sensors in the upper part and the lower part of the elevator shaft for setting the end limits of movement of the elevator car in service drive permitted mode, which service drive sensors are situated farther from the ends of the elevator shaft than the service space limit switches, and wherein the control unit stops the elevator car by controlling the mechanical stopping appliance when the elevator car reaches the service drive sensors and then permits the elevator control system to start another run, the control unit switching to a drive prevented mode if the elevator car reaches a service space limit switch, and a manually operated return appliance to cancel the drive prevented mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for setting the safety spaces of an elevator, comprising:
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reading information with a control unit from sensors that measure the position of a landing door of the elevator car, information is read from the sensors that measure the position of the landing door of the elevator car and if, on the basis of the measurements the landing door is detected opening onto the elevator shaft, the control unit is switched to a person in the elevator shaft mode; and preventing driving of the elevator car by controlling at least one mechanical stopping appliance; sending information about the person in the elevator shaft mode to an elevator control system; wherein, after the control unit has switched to the person in the elevator shaft mode, a service drive switch is read with the control unit and, if it is detected that the service drive switch has switched to service drive mode, the control unit is switched to a service drive permitted mode and states of service space limit switches are read with the control unit and, if a service space limit switch is detected as being open, the control unit switches to a drive prevented mode, monitoring the safety spaces of the elevator with service drive sensors in the upper part and the lower part of the elevator shaft for setting the end limits of movement of the elevator car in service drive, the service drive sensors situated farther from the ends of the elevator shaft than the service space limit switches, stopping the elevator car by controlling the mechanical stopping appliance when the elevator car reaches the service drive sensors and then permitting the elevator control system to start another run; switching to a drive prevented mode if the elevator car reaches a service space limit switch, and canceling the drive prevented mode with a manually operated return appliance. - View Dependent Claims (17, 18, 19, 20)
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21. A safety arrangement in an elevator, comprising:
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an elevator shaft having a top and a bottom; a plurality of floors connected to the elevator shaft; a landing door on each floor; an elevator car movable within the elevator shaft along a travel path, the elevator car having an elevator door; a first normal drive limit sensor near the bottom of the elevator shaft and a second normal drive limit sensor near the top of the elevator shaft, the normal drive limit sensors defining the end limits of the travel path of the elevator car when the elevator is in a normal mode; a first service space limit sensor near the bottom of the elevator shaft and further from the bottom than the first normal drive limit sensor and a second service space limit sensor near the top of the elevator shaft and further from the top than the second normal drive limit switch, the service space limit sensors defining the end limits of the travel path of the elevator car when the elevator is in a service drive mode; a control unit controlling the movement of the elevator car within the elevator shaft; and a reader on the elevator car for reading the normal drive limit sensors and service space limit sensor. - View Dependent Claims (22, 23, 24, 25, 27, 28, 29)
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26. A safety arrangement in an elevator, comprising:
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an elevator shaft having a top and a bottom; a plurality of floors connected to the elevator shaft; a landing door on each floor; an elevator car movable within the elevator shaft along a travel path, the elevator car having an elevator door; a first normal drive limit sensor near the bottom of the elevator shaft and a second normal drive limit sensor near the top of the elevator shaft, the normal drive limit sensors defining the end limits of the travel path of the elevator car when the elevator is in a normal mode; a first service space limit sensor near the bottom of the elevator shaft and further from the bottom than the first normal drive limit sensor and a second service space limit sensor near the top of the elevator shaft and further from the top than the second normal drive limit switch, the service space limit sensors defining the end limits of the travel path of the elevator car when the elevator is in a service drive mode; a control unit controlling the movement of the elevator car within the elevator; sensors for indicating a person has entered the elevator shaft, wherein the sensors for indicating a person has entered the elevator shaft comprises; a position sensor on the elevator car; and a circuit, the circuit comprising; a switch at each landing door, the switch being closed when the landing door is closed and the switch being open when the landing door is open; a resistor in parallel with each switch; a voltage source; and a current reader, wherein the wherein the sensors for indicating a person has entered the elevator shaft can determine if a landing door is opened when the elevator car is not at the landing door, and wherein a bottom-most landing door has a resistor with a value different than any other resistor.
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30. A safety arrangement in an elevator, comprising:
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an elevator shaft having a top and a bottom; a plurality of floors connected to the elevator shaft; a landing door on each floor; an elevator car movable within the elevator shaft along a travel path, the elevator car having an elevator door; a position sensor on the elevator car; and a circuit, the circuit comprising; a switch at each landing door, the switch being closed when the landing door is closed and the switch being open when the landing door is open; a resistor in parallel with each switch; a voltage source; a current reader; and a control unit to determine if a landing door is opened when the elevator car is not at the landing door; the resistor at the lowermost floor landing door has a different resistance that other resistors in the circuit.
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Specification