Synchronous Stroller Unlocking Mechanism for Seat and Frame Locks

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Solution Overview

Problem

Existing strollers require separate locking mechanisms for the seat and stroller frame, which is inconvenient and prone to damage due to complexity.

Innovation Solution

A synchronous unlocking mechanism that synchronously unlocks the seat and stroller frame using a grip, locking member, elastic member, and towing member, allowing simultaneous operation of both components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate locking mechanisms are used for the seat and stroller frame, then each component can be locked independently, but the device complexity increases and the ease of operation decreases

Engineering Contradiction:
Improveindependent locking capabilityVSAvoidmultiple locking mechanisms
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the seat locking mechanism and stroller frame locking mechanism into a single integrated locking system. The locking member is coupled to both the seat assembly and stroller frame, allowing one locking operation to secure both components simultaneously, thereby reducing device complexity while maintaining independent locking capability through the integrated design

Inventive Principle:
Principle #5Merging (Combining)

2Reliability

If separate locking mechanisms are used for the seat and stroller frame, then each component can be locked independently, but the ease of operation worsens as users must operate each mechanism separately

Engineering Contradiction:
Improveindependent locking capabilityVSAvoidunlocking operation
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent merges the operation of two separate locking mechanisms into a single unified operation. The grip is coupled to the locking member which simultaneously controls both seat locking and frame locking, allowing users to unlock both components with one action, significantly improving ease of operation while maintaining the reliability of independent locking through the coupled design

Inventive Principle:
Principle #5Merging (Combining)

3Reliability

If multiple locking mechanisms are used in the stroller, then comprehensive locking coverage is achieved, but the device complexity increases and reliability decreases due to more potential failure points

Engineering Contradiction:
Improvelocking coverageVSAvoidnumber of locking mechanisms
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple locking mechanisms into a single integrated locking system that provides comprehensive locking coverage. The locking member is simultaneously coupled to the seat assembly and stroller frame, creating one unified mechanism that secures both components, thereby reducing the number of potential failure points while maintaining comprehensive locking coverage

Inventive Principle:
Principle #5Merging (Combining)

4Reliability

If multiple locking mechanisms are used in the stroller, then comprehensive locking coverage is achieved, but the ease of operation worsens and the device is more prone to damage

Engineering Contradiction:
Improvelocking coverageVSAvoidunlocking process
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent merges multiple locking mechanisms into a single integrated system that provides comprehensive locking coverage. The grip is coupled to the locking member which simultaneously controls both seat and frame locking, allowing users to unlock both components with one simple action, thereby improving ease of operation while maintaining comprehensive locking coverage and reducing the complexity that leads to damage

Inventive Principle:
Principle #5Merging (Combining)

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

Saves user time and simplifies the unlocking process, reducing the likelihood of mechanism failure.

Implementation Method 1

an elastic member, configured between the locking member and the seat frame or between the locking member and the backrest

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentEP4110676B1Synchronous unlocking mechanism and stroller
Publication Date: 2025.09.03 WONDERLAND SWITZERLAND AG
  • EP4110676B1 patent drawingFigure 1
  • EP4110676B1 patent drawingFigure 2
  • EP4110676B1 patent drawingFigure 3

AI summary

The present disclosure provides a synchronous unlocking mechanism (30), configured on a seat (10) and a stroller frame (20), in which the seat (10) includes a seat frame (11), a backrest (12) and a shaft (13), the seat frame (11) is pivotally connected to the backrest (12) through the shaft (13), and the stroller frame (20) includes a fixing member (21) for selectively locking the stroller frame (20). The synchronous unlocking mechanism (30) includes a grip (31), a locking member (32), an elastic member (33) and a towing member (34), wherein the grip is pivotally connected to the seat frame (11) and/or the backrest (12); the locking member (32) is slidably disposed on the shaft (13), the seat frame (11) and the backrest (12) along an axial direction of the shaft (13) and is coupled to the grip (31); the elastic member (33) is configured between the locking member (32) and the seat frame (11) or between the locking member (32) and the backrest (12); and the towing member (34) is connected to the grip (31) and the fixing member (21).