Pivoting Lockout Member for Control Switches
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Solution Overview
Problem
Medium and high-voltage circuit breaker control switches with pistol grip handles lack a locking mechanism, making it unsafe to lock them into the off position and tag them for servicing, posing a risk for hazardous energy release.
Innovation Solution
A lockout/tagout system with a pivoting locking member and hinges that can be mounted on the control switch, allowing the handle to be locked in place using a padlock, preventing accidental operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is added to pistol grip control switches, then safety and security are improved, but device complexity increases
Solution Approach 1:
The locking system is divided into separate components: a locking member with hinge arms that can be independently attached to the control switch, and a padlock that secures the locking member. This segmentation allows the locking function to be added without redesigning the entire control switch assembly.
Solution Approach 2:
The locking member acts as an intermediary between the padlock and the control switch handle. It provides the necessary locking interface without requiring modifications to the control switch itself, thereby adding safety while minimizing complexity increase to the original device.
2Reliability
If a locking mechanism is installed on the control switch, then worker safety is improved, but ease of operation deteriorates
Solution Approach 1:
The locking member is designed to be dynamically attachable and removable from the control switch. During normal operation, the locking member can be quickly installed or removed without complex procedures, maintaining ease of operation while providing safety when needed.
Solution Approach 2:
The locking member is pre-positioned and can be rapidly engaged with the control switch handle. This preliminary positioning allows workers to quickly secure the switch in the off position during lockout/tagout procedures without extensive setup time.
3Object-affected harmful factors
If the locking member prevents handle movement, then energy release prevention is improved, but adaptability decreases
Solution Approach 1:
The locking member is designed with a universal interface that can accommodate different pistol grip control switch handles. The hinge arms and U-shaped member configuration allow it to work with various switch designs, maintaining adaptability while effectively preventing handle movement and energy release.
Solution Approach 2:
The locking member creates a mechanical copy or replica of the handle's movement path through the U-shaped member opening. This allows the locking mechanism to follow and control the handle's motion trajectory without requiring a custom-designed lock for each specific switch model.
Data Source
AI summary
A pivoting lockout member that is mounted to a pair of hinge member installed onto a control switch. Each of the hinge members includes a planar flange having a hole formed therethrough that is dimensioned to accept the face plate screw of a control switch. The lockout member has a pair of hinge arms that are connected together and spaced apart by a central U-shaped member. A pair of lock flanges extend at right angles to the U-shaped member and have holed formed therethrough that are aligned with each other to accept a conventional padlock. The locking member is moved between an unlocked position where the control switch handle is free to move, and a locked position where the U-shaped member captures the handle and prevent it from being operated.