One-Piece Toggle Bar for Breaker Box Switches

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Solution Overview

Problem

Existing double throw switch linkages are complex and costly, often requiring multiple parts for assembly, and fail to ensure safe isolation of emergency generators from utility power lines, leading to dangerous situations during utility work.

Innovation Solution

A simple, one-piece toggle bar made of metal or synthetic polymer is used to link two breaker switches in a conventional breaker box, ensuring only one power source is active at a time, preventing simultaneous operation of emergency and utility power sources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple slots and fasteners are used in the linkage assembly, then the switching mechanism can control two switches, but the assembly complexity and manufacturing cost increase

Engineering Contradiction:

Improveswitching control capabilityVSAvoidassembly complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges multiple separate linkage components (slots, fasteners, actuator plate, lever arms) into a single integrated toggle bar structure. This single piece of hardware performs the function of coordinating two switches simultaneously, eliminating the need for multiple discrete parts and their associated assembly steps while maintaining full dual-switch control capability

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If traditional multi-part linkages are used, then the switching function is achieved, but the manufacturing cost increases

Engineering Contradiction:

Improveswitching functionVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

By combining multiple manufactured parts into a single molded or machined toggle bar, the patent reduces manufacturing steps, material waste, and assembly operations. This integration significantly lowers production costs while maintaining the required switching functionality for coordinating two breakers

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single toggle bar serves multiple functions simultaneously: it acts as a mechanical linkage, provides structural support, enables dual-switch coordination, and ensures safe isolation. This multi-functionality in a single component reduces the overall bill of materials and manufacturing complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If the linkage allows both switches to be on simultaneously, then operational flexibility is improved, but safety hazards increase due to potential electrocution risks

Engineering Contradiction:

Improveoperational flexibilityVSAvoidelectrocution hazard

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The toggle bar's mechanical design incorporates preliminary anti-action by physically preventing both breakers from being in the ON position simultaneously. The single toggle mechanism can only occupy one position at a time, which automatically ensures that when one breaker is ON, the other must be OFF, thereby preemptively eliminating the dangerous condition of simultaneous power connection

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent converts the potential harm of operational flexibility into a safety benefit by designing the toggle mechanism so that its single-position constraint naturally enforces safe operation. The limitation of having only one position becomes the safety feature that prevents electrocution hazards, turning what could be seen as a restriction into a protective mechanism

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS9905388B2Double-throw switch for breaker box

Publication Date: 2018.02.27 EDMONDS ELMER

AI summary

A first breaker is adapted to be connected to an external source of electrical power, and a second breaker is adapted to be connected to an electrical generator. The first breaker is in an on position when the second breaker is in an off position, and the first breaker is in an off position when the second breaker is in an on position. The breakers are in combination with a toggle adapted to simultaneously operate the first breaker and the second breaker. The first breaker has a first breaker hole, and the second breaker has a second breaker hole, where the first breaker electrically connects an external power transmission to a breaker box, and the second breaker electrically connects a generator to the breaker box. The toggle comprising an integral bar with a first toggle hole through the toggle, and a second toggle hole through the toggle, such that the first toggle hole and the second toggle hole are longitudinally spaced whereby the first toggle hole registers with the first breaker hole while the second toggle hole registers with the second breaker hole. A first bolt extends through both the first toggle hole and the first breaker hole, and a second bolt extends through the second toggle hole and the second breaker hole, such that when the first breaker is turned to an on position, the toggle simultaneously turns the second breaker to an off position, and when the first breaker is turned to an off position, the toggle simultaneously turns the second breaker to an on position.