MECHANISM FOR IMPROVING SAFETY FOR AN ELEVATOR SYSTEM
1 Assignment
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Accused Products
Abstract
A safety control device applicable to an elevator system including an elevator car driven in an elevator shaft by means of a drive device, said safety control device comprising at least one sensor configured to detect, in the elevator shaft, a presence of an object in at least one specified area of the elevator shaft, and a controller configured to receive and process a signal of the at least one sensor indicating a detection result, and to conduct, when the detection result indicates the presence of an object in the at least one specified area of the elevator shaft, a safety procedure in which a switch from a normal drive control of the drive unit to a safety drive control is executed in which a target value set for the speed of the elevator car is decreased.
8 Citations
34 Claims
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1-14. -14. (canceled)
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15. A safety control device applicable to an elevator system including an elevator car driven in an elevator shaft by a drive device, said safety control device comprising:
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at least one sensor configured to detect, in the elevator shaft, a presence of an object in at least one specified area of the elevator shaft; and a controller configured to receive and process a signal of the at least one sensor indicating a detection result, and to conduct, when the detection result indicates the presence of an object in the at least one specified area of the elevator shaft, a safety procedure in which a switch from a normal drive control of the drive device to a safety drive control is executed in which a target value set for the speed of the elevator car is decreased, wherein the at least one specified area of the elevator shaft is a headroom of the elevator shaft and/or a pit safety space of the elevator shaft, and wherein the safety procedure to be conducted by the controller includes at least one of; limiting a target value set for the speed of the elevator car during the safety drive control in at least one of an upward and downward direction to a predefined fraction of a nominal target speed set in the normal drive control; and limiting a target value set for the speed of the elevator car during the safety drive control in at least one of an upward and downward direction to a predefined fraction of a nominal target speed set in a service drive control authorized for service personnel. - View Dependent Claims (16, 17, 18, 19, 27, 28, 29, 30, 31)
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20. A safety control method applicable to an elevator system including an elevator car driven in an elevator shaft by a drive device, said method comprising:
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detecting, in the elevator shaft, a presence of an object in at least one specified area of the elevator shaft; processing a detection result; and conducting, when the detection result indicates the presence of an object in the at least one specified area of the elevator shaft, a safety procedure in which a switch from a normal drive control of the drive device to a safety drive control is executed in which a target value set for the speed of the elevator car is decreased, wherein the at least one specified area of the elevator shaft is a headroom of the elevator shaft and/or a pit safety space of the elevator shaft, and wherein the safety procedure to be conducted includes at least one of limiting a target value set for the speed of the elevator car during the safety drive control in at least one of an upward and downward direction to a predefined fraction of a nominal target speed set in the normal drive control, and limiting a target value set for the speed of the elevator car during the safety drive control in at least one of an upward and downward direction to a predefined fraction of a nominal target speed set in a service drive control authorized for service personnel. - View Dependent Claims (21, 22, 23, 24, 25, 26, 32, 33, 34)
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Specification