Elevator Switch Adapter for Automatic Safety Reset
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Solution Overview
Problem
Existing elevator safety switch testing procedures require two technicians, one above and one below the elevator cab, which is dangerous, time-consuming, and costly.
Innovation Solution
An accessory device is added to existing elevator switches to allow automatic resetting during testing, enabling a single technician to operate the switch from a safe location above the cab.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional manual reset procedure is used, then safety can be ensured through direct technician intervention, but testing time increases and requires two technicians
Solution Approach 1:
The switch adapter enables the safety switch to automatically reset itself after tripping during testing. The device includes a tripping mechanism that activates the switch and a separate resetting mechanism that returns it to normal position, eliminating the need for manual intervention by technicians to reset the switch after safety testing.
Solution Approach 2:
The switch adapter is designed as a separate accessory device that attaches to the existing safety switch. It divides the switching function into two independent mechanisms: one for tripping (activating safety) and one for resetting (returning to normal operation), allowing automated operation without requiring technician presence below the cab.
2Reliability
If traditional manual reset procedure is used, then proper switch operation can be confirmed, but risk to technicians increases due to required presence below cab
Solution Approach 1:
The switch adapter automatically performs both tripping and resetting functions through mechanical linkages connected to the safety switch. The device confirms proper operation through visual indicators (such as flag positions) that show whether the switch is in tripped or normal state, eliminating the need for technicians to physically position themselves below the cab to verify switch operation.
3Reliability
If two technicians are used for testing, then comprehensive safety checks can be performed, but cost and complexity increase
Solution Approach 1:
The switch adapter enables a single technician to perform complete safety testing from a safe location above the cab. The device automatically executes the reset function and provides visual confirmation of switch states, reducing manpower requirements from two technicians to one while maintaining comprehensive safety verification through observable indicators.
4Device complexity
If traditional switch design is used, then mechanical simplicity is maintained, but automation capability is lost
Solution Approach 1:
The switch adapter maintains mechanical simplicity by using basic mechanical linkages, springs, and levers that attach to the existing safety switch. It segments the automation function into separate mechanical components: a tripping linkage connected to the safety mechanism and a resetting linkage with a spring-loaded return mechanism, achieving automatic operation without complex electronic or hydraulic systems.
Data Source
AI summary
An elevator switch adapted that ambidextrously attaches to either side of an emergency elevator off-on-off car safeties switch that biases the switch into the on position while blocking one of the off positions. The elevator car safeties temporarily, electrically limits elevator function in an over-speed situation.