Hand Warmer with Hall Switch Magnetic Connection

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Solution Overview

Problem

Conventional hand warmers with double-sided heating are inconvenient to carry and use separately, as they require two units to be used together, limiting portability and efficiency.

Innovation Solution

A hand warmer design featuring a cambered and flat surface configuration, with Hall switches and magnetic steels to allow connection and disconnection of heating circuits, enabling separate or combined use, and incorporating heat insulation grooves, waterproofing, and non-slip rubber strips for enhanced usability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If two hand warmers are used together with double-sided heating, then heating coverage is improved, but portability and ease of carrying deteriorate

Engineering Contradiction:

Improveheating coverageVSAvoidportability

Core Design Contradiction:

TemperatureVSEase of operation

Solution Approach 1:

The patent merges two hand warmers into a single integrated unit by connecting them through a bonding surface. The first and second hand warmer bodies are joined together, allowing them to function as one unified device that can be carried conveniently while providing heating coverage for both hands when used together.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The hand warmer is designed with multi-functionality to serve multiple usage scenarios. It can be used separately by each user or combined by two users holding hands, providing universal applicability across different situations while maintaining portability as a single unit.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Temperature

If heating films are connected on the bonding surface, then heating continuity is improved, but safety and energy efficiency deteriorate due to potential overheating

Engineering Contradiction:

Improveheating continuityVSAvoidsafety

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent extracts the heating function from the bonding surface by configuring the heating films to be disconnected on the bonding surface. This means the heating elements are removed from the connection area, preventing overheating and ensuring safety while allowing the hand warmers to be connected without electrical continuity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent converts the potential harm of continuous heating at the bonding surface into a benefit by deliberately disconnecting the heating films there. This design choice prevents overheating and safety issues while still allowing the hand warmers to be used together, turning a potential hazard into a safety feature.

Inventive Principle:

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

3Measurement precision

If Hall switches and magnetic steels are used for connection detection, then connection accuracy is improved, but device complexity increases

Engineering Contradiction:

Improveconnection accuracyVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical connection detection mechanisms with a magnetic field-based Hall switch system. The Hall switches and magnetic steels provide precise detection of hand warmer connection status through magnetic field interaction, achieving accurate measurement with relatively simple implementation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables safer, more energy-efficient, and convenient use of hand warmers, allowing for separate or combined operation while ensuring stability and broadening application prospects.

Implementation Method 1

the outer shell is internally provided with a Hall switch that is tightly attached to the flat surface and a magnetic steel located on a side of the Hall switch

Methodology Applied

Scientific EffectHall effect: Hall Effect

Implementation Method 2

when flat surfaces of the two hand warmer bodies are opposite and attached to each other, Hall switches and magnetic steels inside the two hand warmer bodies are opposite, and the Hall switches are triggered

Methodology Applied

Scientific EffectMagnetic field interaction: Magnetic Field

Implementation Method 3

a heating film disposed on each of two sides of the outer shell

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 4

an aluminum alloy thermally-conductive cover plate covered on the heating film

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 5

the two sides of the outer shell each are provided with a heat insulation groove, and the heating film is disposed inside the heat insulation groove

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS20240350300A1Hand warmer with double-sided heating

Publication Date: 2024.10.24 SHENZHEN STREET CAT TECH CO LTD

AI summary

A hand warmer with double-sided heating is provided. The hand warmer includes a hand warmer body with a cambered surface on one side and a flat surface on the other side. Through the flat surface of the hand warmer body, two hand warmer bodies can be attached together. The hand warmer body includes an outer shell, a heating film disposed on each of two sides of the outer shell, and an aluminum alloy thermally-conductive cover plate covered on the heating film. The outer shell is internally provided with a Hall switch that is tightly attached to the flat surface and a magnetic steel located on a side of the Hall switch. Flat surfaces of the two hand warmer bodies are opposite and attached to each other.