Modular Bicycle Frame With Interchangeable Rear Modules

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Solution Overview

Problem

Existing children's bicycles do not efficiently accommodate growth and varying cycling abilities of children, requiring separate purchase of different bicycle configurations as children develop, leading to waste and increased costs.

Innovation Solution

A modular riding vehicle design featuring a front assembly that can be combined with interchangeable rear modules, allowing conversion between balance and pedal bicycle configurations, with adjustable seat height and secure attachment mechanisms for easy module swapping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate bicycles are purchased for different configurations (balance bike, pedal bike) as children grow, then the child can have appropriate bicycle for each stage, but it leads to waste and increased costs

Engineering Contradiction:

Improvebicycle configuration adaptabilityVSAvoidmaterial waste

Core Design Contradiction:

Adaptability or versatilityVSLoss of substance

Solution Approach 1:

The bicycle is divided into a front assembly and a rear module that can be separated and reconfigured. The front assembly contains the head tube, handlebars, front wheel, and part of the frame, while the rear module contains the rear wheel, seat, and drivetrain components. This segmentation allows the same front assembly to be paired with different rear modules to create different bicycle configurations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The front assembly is designed as a universal component that can work with multiple types of rear modules. The connection interface between the front assembly and rear module uses standardized elements (such as axles, connectors, and mounting points) that allow the same front assembly to accommodate both balance bike rear modules and pedal bike rear modules, making the front assembly multi-functional.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If separate bicycles are purchased for different configurations, then each configuration is optimized for specific needs, but it requires increased financial investment

Engineering Contradiction:

Improvebicycle configuration adaptabilityVSAvoidnumber of bicycles to purchase

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The bicycle system is designed to be dynamically reconfigurable rather than static. The connection between the front assembly and rear module allows for easy attachment and detachment, enabling the bicycle to transition between different configurations (balance bike, pedal bike, different wheel sizes) without requiring permanent fixed structures. This dynamic design allows one bicycle to replace multiple static bicycles.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If traditional fixed-configuration bicycles are used, then the structure is simple and stable, but it cannot accommodate growth and varying cycling abilities

Engineering Contradiction:

Improveconfiguration change easeVSAvoidbicycle structure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The front assembly and rear module are designed with pre-configured connection points, standardized interfaces, and alignment features that facilitate easy assembly and disassembly. The connection mechanism includes pre-positioned axles, connectors, and mounting brackets that guide the user through the configuration change process, reducing the complexity of reconfiguration despite the modular design.

Inventive Principle:

Principle #10Preliminary action

4Adaptability or versatility

If modular design with interchangeable rear modules is implemented, then configuration flexibility is improved, but attachment and detachment mechanisms add structural complexity

Engineering Contradiction:

Improverear module interchangeabilityVSAvoidconnection mechanism complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The connection mechanisms are designed to be simple, lightweight, and easy to manufacture rather than complex and durable. The axles, connectors, and mounting elements use basic mechanical designs (such as simple insertion slots, snap-fit features, or basic bolt connections) that prioritize ease of assembly and disassembly over long-term structural complexity. This allows the connection system to remain simple despite enabling multiple reconfigurations.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS20260048809A1Modular riding vehicle

Publication Date: 2026.02.19 DOONA HLDG

AI summary

A front assembly for use with a rear module to form a riding vehicle is disclosed. The front assembly includes an elongate frame, a mount disposed beneath the elongate frame, a head assembly with a front wheel and handlebar, and a seat mounted relative to the elongate frame. The elongate frame terminates in two laterally spaced apart prongs removably securable to connectors of the rear module. The connectors and elongate frame together constitute a bicycle frame. The riding vehicle may be convertible between different configurations, such as a balance bicycle and a pedal bicycle, by interchanging rear modules. The rear modules may have different wheel sizes and connector geometries while maintaining compatibility with the front assembly. The riding vehicle may include features for partially encasing the mount in different configurations and may be foldable for compact storage.