Retractable Skating Wheel Footwear Locking Mechanism

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Solution Overview

Problem

Existing footwear with skating wheels lacks a reliable mechanism to securely deploy and retract the wheels between skating and walking configurations, failing to maintain a low profile when walking.

Innovation Solution

A footwear design featuring a retractable skating wheel mechanism with a locking assembly that includes upper and lower rail assemblies and an actuating handle, allowing the wheels to be securely deployed for skating or retracted for walking, while maintaining a low profile and being cost-effective to manufacture and maintain.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a locking mechanism is added to securely deploy and retract skating wheels, then the reliability of wheel positioning is improved, but the device complexity increases

Engineering Contradiction:
Improvewheel positioning reliabilityVSAvoidlocking mechanism complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The locking mechanism is segmented into distinct functional components: upper and lower rail assemblies with integrated locking rails, and an actuating handle. This segmentation allows each component to perform its specific function independently, improving reliability while keeping the overall design manageable and not excessively complex.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The locking rails are merged with the rail assemblies, integrating the locking function directly into the structural components. This merging eliminates the need for separate locking mechanisms, thereby improving reliability through unified design while avoiding additional complexity from separate components.

Inventive Principle:
Principle #5Merging (Combining)

2Adaptability or versatility

If the wheel mechanism is designed to be low profile for walking, then the adaptability between skating and walking modes is improved, but the manufacturing complexity increases

Engineering Contradiction:
Improveskating and walking mode adaptabilityVSAvoidlow profile mechanism manufacturing
Core Design Contradiction:
Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The wheel assembly is nested within the sole when in the walking position, with the wheel mechanism contained within a recess in the sole. This nesting achieves the low profile appearance required for walking while using standard manufacturing techniques for recesses and fittings, avoiding excessive manufacturing complexity.

Inventive Principle:
Principle #7Nested doll (Nesting)

Solution Approach 2:

The wheel mechanism is designed to be dynamically reconfigurable between a retracted low-profile state for walking and a deployed state for skating. The movable wheel assembly that can be rotated into and out of the sole provides this dynamic adaptability through relatively simple mechanical movement rather than complex transformation mechanisms.

Inventive Principle:
Principle #15Dynamics

3Stability of the object's composition

If a locking assembly with upper and lower rail assemblies is implemented, then the stability of the skating configuration is improved, but the device complexity increases

Engineering Contradiction:
Improveskating configuration stabilityVSAvoidlocking assembly complexity
Core Design Contradiction:
Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The locking function is extracted as a separate functional element within the rail assemblies, with dedicated locking rails that engage with the actuating handle. This extraction allows the locking mechanism to be optimized for stability while remaining a discrete, manageable component rather than an integrated complex system.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The actuating handle serves as an intermediary element that engages with both the upper and lower locking rails to provide stable locking action. This intermediary component simplifies the overall system by providing a single control mechanism that achieves stable locking through sequential engagement with the locking rails.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS8998217B1Footwear with selectively retractable skating wheels
Publication Date: 2015.04.07 GARDEN STATE R&D
  • US8998217B1 patent drawing
  • US8998217B1 patent drawing
  • US8998217B1 patent drawing

AI summary

A footwear product (10) with a selectively retractable skating mechanism (30) that permits a user to selectively change from WALK to SKATE. Mechanism (30) includes two coaxially disposed elongated rail assemblies (40; 60) conforming to each other and snuggly fitted to allow them to slide and cammingly deploy and retract wheel assembly (80) that protrudes outwardly in the SKATE position. Upper rail assembly (40) is totally housed within the sole assembly (20) in the WALK position.