Elevator Overspeed Switch Assembly With Automatic Reset
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Solution Overview
Problem
Existing overspeed governor assemblies for elevators lack an efficient mechanism to return the overspeed protection switch to its untriggered position after activation, necessitating manual intervention and increasing downtime between overspeed events.
Innovation Solution
An overspeed protection switch with a trigger device, actuation device, and reset member that allows the trigger member to rotate to a triggered position and back to an untriggered position through linear movement, utilizing protrusions and connection arms to facilitate automatic resetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overspeed protection switch is activated to brake the elevator, then safety is improved, but the switch remains in triggered position requiring manual intervention which increases downtime
Solution Approach 1:
The reset member is designed to automatically return the trigger member to its initial position after overspeed protection activation. The reset member includes a push rod that contacts the trigger member and pushes it back to the untriggered position, enabling the system to reset itself without manual intervention and reducing downtime between operational cycles
Solution Approach 2:
The reset member acts as a feedback mechanism that automatically responds to the triggered state by returning the trigger member to its initial position. This feedback loop ensures the switch is ready for the next overspeed event without requiring external manual resetting, thereby reducing operational downtime
2Ease of operation
If manual intervention is required to reset the overspeed protection switch, then operational control is improved, but device complexity increases due to additional reset mechanisms
Solution Approach 1:
The reset member is integrated within the same housing as the trigger member and centrifugal mechanism, combining the protection and reset functions into a single compact assembly. This merging reduces overall device complexity compared to having separate manual reset mechanisms while maintaining ease of operation
Solution Approach 2:
The automatic reset mechanism eliminates the need for separate manual intervention systems. The reset member self-activates when the trigger member is in the triggered position and automatically returns it to the initial position, simplifying the overall system while maintaining operational control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables automatic resetting of the overspeed protection switch, reducing downtime and enhancing operational efficiency by allowing the elevator to resume normal operation without manual intervention after overspeed events.
Implementation Method 1
an overspeed governor assembly includes a centrifugal mechanism which is gradually deployed as a rotational speed of a rope sheave increases
Implementation Method 2
an actuation device including an action end capable of performing a linear movement; and a reset member which is connected with the action end of the actuation device and is translated with the linear movement of the action end of the actuation device
Data Source
AI summary
An overspeed protection switch, an overspeed governor assembly and an elevator system are provided by the present disclosure. The overspeed protection switch includes: a trigger device including a trigger member and at least one protrusion, wherein the trigger member is capable of rotating to a triggered position from an untriggered position when being toggled, and the at least one protrusion is connected to the trigger member and rotates together with the trigger member; an actuation device including an action end capable of performing a linear movement; and a reset member which is connected with the action end of the actuation device and is translated with the linear movement of the action end of the actuation device so as to push one of the at least one protrusion to drive the trigger member to return to the untriggered position from the triggered position.