Contactless Optical Sensor for Elevator Safety Systems
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Summary
Problems
Conventional elevator safety apparatuses rely on electrical or electromechanical contacts and switches, which are prone to maintenance issues due to wear and tear, and can experience defects from contact erosion, leading to potential loss of function.
Innovation solutions
A contactless optical sensor system with a transmitter and receiver, utilizing reflective surfaces or fiberoptic conductors, that determines the door closing state without mechanical contact, reducing maintenance needs and avoiding defects from contact erosion, and enabling a failsafe circuit for reliable operation.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If electrical or electromechanical contacts and switches are used to determine door locking state, then the door closing state can be detected, but wear and contact erosion occur leading to maintenance issues and potential loss of function
Why choose this principle:
The patent replaces electromechanical contacts and switches with an optical sensor system comprising a transmitter and receiver. The optical signal detection mechanism eliminates physical contact between components, thereby preventing wear and contact erosion while maintaining reliable door state detection functionality
Principle concept:
If electrical or electromechanical contacts and switches are used to determine door locking state, then the door closing state can be detected, but wear and contact erosion occur leading to maintenance issues and potential loss of function
Why choose this principle:
The patent introduces an optical signal as an intermediary between the door position and the detection system. The optical sensor uses light transmission or reflection through a contact bridge to indicate door state, eliminating the need for direct electrical contact while providing reliable detection
Application Domain
Data Source
AI summary:
A contactless optical sensor system with a transmitter and receiver, utilizing reflective surfaces or fiberoptic conductors, that determines the door closing state without mechanical contact, reducing maintenance needs and avoiding defects from contact erosion, and enabling a failsafe circuit for reliable operation.
Abstract
A sensor for safety apparatuses for elevator apparatuses which can move a cab by means of a drive, the sensor including a contact bridge and a contact receptacle for receiving the contact bridge, said contact bridge being arranged in such a way that the closing state of the elevator door can be determined by connection of the contact receptacle and the contact bridge. In order to be able to improve in particular the susceptibility to maintenance, the sensor is in the form of an optical sensor which comprises a transmitter for transmitting an optical signal and a receiver for receiving the optical signal, the transmitter and the receiver being arranged on the contact receptacle and the contact bridge comprising at least one transmission element for transmitting the optical signal.