Power Source Circuit Shutoff Device Restriction Rib Design

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Solution Overview

Problem

Conventional power source circuit shutoff devices experience operability issues due to inclination of the lever housing during operation lever rotation, leading to increased sliding resistance and operational force, which hinders smooth mating and separating processes.

Innovation Solution

Incorporation of restriction ribs on both the base and lever housings, positioned diagonally relative to the operation lever's axis, to guide and restrict the inclination of the lever housing, ensuring smooth sliding and mating operations by engaging between the lever mating start and completion positions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the operation lever is rotated to mate the lever housing with the base housing, then the terminals are electrically connected, but the lever housing inclines relative to the base housing causing increased sliding resistance and operational force

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidoperational force

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The restriction rib acts as an intermediary element between the lever housing and base housing, mediating the mating process by preventing inclination while allowing the necessary sliding motion for terminal connection

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The inclination problem is extracted and addressed separately through the restriction rib structure, which specifically targets and eliminates the unwanted rotational degree of freedom without affecting the primary mating function

Inventive Principle:

Principle #2Taking out (Extraction)

2Adaptability or versatility

If the lever housing is allowed to incline during operation, then the mating process can accommodate misalignment, but the sliding resistance increases and operability deteriorates

Engineering Contradiction:

Improvemating alignment toleranceVSAvoidoperability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The restriction rib provides a dynamic constraint that adapts to the mating process - allowing initial approach and terminal contact while dynamically preventing inclination that would increase friction during the sliding phase

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If the cam pin moves in the cam groove without restriction, then the operation lever can rotate freely, but the lever housing oscillates and mating precision deteriorates

Engineering Contradiction:

Improverotation freedomVSAvoidmating precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The restriction rib serves as an intermediary constraint between the cam pin-cam groove mechanism and the lever housing, filtering out unwanted oscillations while preserving the beneficial rotational freedom for operation

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8915749B2Power source circuit shutoff device

Publication Date: 2014.12.23 YAZAKI CORP

AI summary

A power source circuit shutoff device includes: a base housing including a first mating wall and a cam pin; a lever housing including a second mating wall; and an operation lever rotatably supported to the lever housing and having a cam groove for guiding the cam pin. The base housing and the lever housing are set to a lever mating start position in which the first mating wall and the second mating wall are partly overlapped with each other and the cam pin is entered into the cam groove of the operation lever, and a rotation of the operation lever moves the cam pin in the cam groove to thereby cause a mating force between the first mating wall and the second mating wall. The base housing and the lever housing respectively have restriction ribs.