Foldable Pushchair Frame With Bicycle Rack Mounting

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Solution Overview

Problem

Existing stroller-to-bicycle conversion systems are bulky, heavy, expensive, and impractical, failing to meet the needs of families due to incompatibilities in design and regulatory compliance, and lack flexibility in use and storage.

Innovation Solution

A stroller system convertible into a bicycle seat with a rigid, foldable frame that can be attached to a bicycle rack in both deployed and folded configurations, featuring adjustable handles, locking mechanisms for wheels, and removable accessories, allowing seamless transition between stroller and bicycle seat modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If existing stroller-to-bicycle conversion systems are designed to be bulky and heavy, then they can provide sufficient structural strength and stability, but they become impractical for storage and maneuvering in apartments

Engineering Contradiction:

Improvestructural strengthVSAvoidweight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The stroller frame is divided into separable components that can be folded and detached. The front wheel assembly detaches from the main frame, and the seat unit can be separated, allowing the system to be broken down into manageable segments for storage while maintaining structural integrity when assembled.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stroller incorporates dynamic folding mechanisms that allow the frame to transition between extended and compact configurations. The adjustable handlebar and foldable seat backrest enable the structure to adapt its shape and size based on usage requirements, providing strength when needed and compactness for storage.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If existing conversion systems are designed to be multifunctional, then they can serve both stroller and bicycle seat purposes, but they become expensive and add to family budget

Engineering Contradiction:

ImproveversatilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The stroller is designed with universal interfaces and standardized mounting points that allow it to function both as a standalone stroller and as a bicycle seat attachment. The frame includes integrated bicycle rack mounting brackets, and the seat structure can be securely attached to bicycle racks, eliminating the need for separate products.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If existing stroller loading systems on bicycle are designed without standardized mounting, then they can be adapted to different configurations, but they become difficult to use due to dependence on respective product designs

Engineering Contradiction:

ImproveadaptabilityVSAvoidease of use

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The stroller is pre-equipped with standardized mounting brackets and attachment mechanisms designed specifically for bicycle rack interfaces. The mounting points are pre-positioned and clearly marked, allowing users to quickly attach the stroller to a bicycle rack without complex adjustments or custom fitting procedures.

Inventive Principle:

Principle #10Preliminary action

4Stability of the object's composition

If existing conversion systems are designed without folding capability, then they can maintain structural stability, but they cannot be folded for storage

Engineering Contradiction:

Improvestructural stabilityVSAvoidstorage capability

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4522485B1Pushchair system convertible into a bicycle seat

Publication Date: 2026.02.04 LIF (LAB)

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Figure 2
Figure 3A~3B

AI summary

The invention relates to a pushchair system (2) convertible into a bicycle seat, comprising a foldable rigid chassis (4), a steered front wheelset (14) mounted pivotably about a front axis (X-X), a rear wheelset (20) mounted pivotably about a rear axis (Y-Y), a device for locking the front wheelset in its deployed and folded positions, a device (6) for removable fastening to a bicycle luggage carrier, and a mechanism for locking and unlocking the rear wheelset that is able to cooperate with a stop member secured to the rear wheelset, between a locking position, in which it retains the rear wheelset in its deployed position, and an unlocking position, in which it allows the rear wheelset to pivot towards its folded position, the rear wheelset being retained in its folded position by the front wheelset when the latter is locked in its folded position.