Safety arrangement of an elevator having sensors limiting extent of elevator travel

A method for setting the safety spaces of an elevator, comprising:

• 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.

A safety arrangement in an elevator, comprising:

• 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.

A safety arrangement in an elevator, comprising:

• 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.

A safety arrangement in an elevator, comprising:

• 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.