Electric Shaver Charger Holding Structure With Guide Portion

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Solution Overview

Problem

Conventional techniques for attaching and holding an electric razor on a charger require magnetic attraction or mechanical mechanisms, which can damage resin molded parts during repeated attachment and detachment, and often necessitate electrical connection for charging.

Innovation Solution

A holding structure featuring conducting terminals on the electric razor and a guide portion on the charger, energized by an elastic member, allowing stable mounting and charging without magnetic attraction, using a V-shaped guide with varying angles for improved usability and reduced part count.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If magnetic holding mechanism is used to attach electric razor on charger, then holding stability is improved, but device complexity increases due to need for magnets and electrical connection mechanisms

Engineering Contradiction:

Improveholding stabilityVSAvoidmechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the magnetic holding mechanism and complex electrical connection components from the charger design. Instead, it uses the razor's own weight and a simple guide portion to achieve stable attachment, while maintaining electrical connection through contact portions that engage automatically during placement.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The razor serves its own weight as the holding force during placement on the charger. The guide portion and contact portions are designed to automatically align and engage when the razor is placed on the charger, eliminating the need for complex alignment mechanisms or active holding forces.

Inventive Principle:

Principle #25Self-service

2Reliability

If mechanical holding mechanism with movable holding arm is used, then holding stability is improved, but ease of operation deteriorates due to repeated attachment and detachment causing damage to resin molded parts

Engineering Contradiction:

Improveholding stabilityVSAvoidattachment durability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Instead of using a movable holding arm that actively grasps the razor, the patent inverts the approach by using the razor's weight and a fixed guide portion to achieve attachment. The contact portions are designed to be resilient and self-aligning, reducing mechanical stress during repeated attachment and detachment operations.

Inventive Principle:

Principle #13The other way round (Inversion)

3Device complexity

If simple holding structure is used without magnetic attraction, then device complexity is reduced, but holding stability deteriorates

Engineering Contradiction:

Improvestructure simplicityVSAvoidholding stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The guide portion is designed with asymmetric geometry (V-shaped cross-section) that provides directional guidance and stable positioning. The contact portions are positioned asymmetrically to ensure proper engagement with the conducting terminals, achieving stable attachment without requiring symmetric magnetic forces.

Inventive Principle:

Principle #4Asymmetry

4Ease of manufacture

If resin molded portions are used for positioning and holding, then ease of manufacture is improved, but reliability deteriorates due to damage from repeated attachment and detachment

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidpart durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The contact portions are designed with elastic properties, allowing them to deform elastically during attachment and detachment. This dynamic response absorbs mechanical stresses that would otherwise damage rigid resin molded parts, extending the durability of the components while maintaining ease of manufacture.

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution provides a stable and simple holding mechanism for the electric razor and charger, eliminating the need for magnetic forces and reducing part complexity, while preventing damage to resin molded parts and ensuring proper electrical contact for charging.

Implementation Method 1

The contact portion is energized by an elastic member

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP2770603B1Structure for holding electric shaver on charger

Publication Date: 2018.11.21 PANASONIC HOLDINGS CORP

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AI summary

In a holding structure for holding an electric razor (10) and the charger (20) which allows the electric razor (10) to be mounted thereon and performs at least charge, a conducting terminal (101) is protruded from a body (11) of the electric razor (10), and a guide portion (103) configured to guide a conducting terminal (101) to a fixed position (104) is provided for a contact portion (102) of the charger (20). The contact portion (102) is energized by a spring (107).