Air Break Switch Blade Lock for Stable Jaw Seating

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Solution Overview

Problem

Existing high voltage/high current air break switches face issues with blades prematurely pivoting about their longitudinal axis, leading to unstable electrical connections and rendering the switch unusable.

Innovation Solution

The design incorporates a jaw assembly, a housing assembly, and a blade assembly that pivot about a first axis to engage the blade contact with the jaw assembly, and the blade assembly is operable to rotate about a second axis only when the distal end of the blade is seated in the jaw assembly, ensuring proper seating and preventing premature pivoting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the blade is designed to pivot about its longitudinal axis to establish electrical contact, then the electrical connection is established, but the blade may pivot prematurely causing unstable connections

Engineering Contradiction:

Improveelectrical connection stabilityVSAvoidblade pivoting control

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The blade assembly is designed to first pivot about the first axis to bring the distal end into the jaw assembly and seat it properly before the blade can pivot about its longitudinal axis. This preliminary seating action ensures the blade is correctly positioned before electrical contact is made, preventing premature or unstable pivoting.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The pivoting motion is divided into two distinct sequential phases: first pivoting about the first axis (entering and seating in the jaw assembly), then pivoting about the longitudinal axis (establishing electrical contact). This segmentation of motion control prevents unintended pivoting and ensures stable connection.

Inventive Principle:

Principle #1Segmentation

2Productivity

If the blade rotates quickly during opening, then the opening operation is completed faster, but momentum causes premature pivoting to closed position

Engineering Contradiction:

Improveswitch opening speedVSAvoidblade position control

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The blade assembly design includes features that counteract the momentum-induced premature pivoting. The structured sequence requiring seating in the jaw assembly before longitudinal axis pivoting creates a mechanical constraint that prevents momentum from causing unintended closed position pivoting, even during quick opening operations.

Inventive Principle:

Principle #9Preliminary anti-action

3Productivity

If the blade bounces off the distal electrical terminal, then the closing operation completes, but the blade rotates about its longitudinal axis before proper seating

Engineering Contradiction:

Improveswitch closing completionVSAvoidblade seating accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The design requires the blade to first pivot about the first axis to enter and properly seat in the jaw assembly before the blade can pivot about its longitudinal axis to make electrical contact. This preliminary seating action prevents the blade from bouncing off the terminal and rotating prematurely, ensuring accurate seating and reliable connection.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12322561B2Side break air switch with anti-rolling blade lock

Publication Date: 2025.06.03 HUBBELL INC

AI summary

A blade assembly for an electrical switch. The blade assembly including a rocker assembly configured to enable rotation of said blade assembly. The rocker assembly including: a first rocker component, said first rocker component having a first rocker pin, and a second rocker component, said second rocker component having a second rocker pin that depresses when said first rocker pin is depressed.