U-Shaped Lock-Out Device for Circuit Breakers
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Solution Overview
Problem
Existing lock-out devices for circuit breakers are often complex, costly, and difficult to install, requiring multiple pieces and additional hardware, and are not easily field-installable or self-orienting to ensure proper alignment.
Innovation Solution
A single-piece, U-shaped lock-out device with protrusions and apertures that can be manually installed without tools, allowing for self-orientation and alignment with the circuit breaker housing, using a blocking member to prevent handle movement between positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art lock-out devices use multiple piece configurations with additional fastening hardware, then the locking function is achieved, but the device complexity and installation cost increase
Solution Approach 1:
The patent combines multiple separate components (mounting bracket, lock-out mechanism, and mounting features) into a single integrated lock-out device. The device includes a body with integrated mounting features such as protrusions that engage with recesses in the circuit breaker housing, eliminating the need for separate fastening hardware and reducing assembly complexity while maintaining reliable locking functionality.
2Reliability
If prior art lock-out devices require additional fastening hardware, then the locking function is secured, but the ease of installation and field-installability deteriorates
Solution Approach 1:
The lock-out device incorporates self-aligning and self-mounting features. The protrusions on the device body automatically engage with corresponding recesses in the circuit breaker housing during installation, eliminating the need for separate fastening hardware and complex assembly procedures. This self-service mechanism simplifies installation while ensuring secure mounting.
3Reliability
If prior art lock-out devices lack self-orienting features, then the locking function is provided, but the alignment precision with switch operating handle deteriorates
Solution Approach 1:
The lock-out device employs asymmetric mounting features including protrusions with specific geometries that correspond to asymmetric recesses in the circuit breaker housing. This asymmetric design ensures proper orientation and alignment of the device with the housing and switch operating handle, preventing incorrect installation while maintaining reliable locking function.
Data Source
AI summary
A circuit breaker lock-out device having a generally U-shaped cross section, configured to mount on a switch having a housing having a recess is provided. Device comprises a first leg connected with a second leg, said second leg having a first aperture configured to receive a blocking member, wherein at least one of said first and second legs has a protrusion configured to engage with said switch housing.