Automatic Direction-Limiting Mechanism for Stroller Wheel Rotation
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Solution Overview
Problem
Conventional direction changeable strollers require manual adjustment to limit the rotation of wheels at the trailing side, making it difficult to control the moving direction of the stroller when the push handle is switched between front and rear positions.
Innovation Solution
A direction changeable stroller with an automatic direction-limiting mechanism that prevents relative rotation between the fixed and rotating portions of the wheel seats, allowing for easy control of the moving direction by limiting the wheels' direction based on the push handle's position, using a mechanism with positioning grooves, automatic positioning members, resilient members, and a braking system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment is used to limit wheel rotation, then the structure is simple, but the ease of operation deteriorates because it requires manual intervention to control moving direction
Solution Approach 1:
The wheel assembly performs self-service by automatically limiting its own rotation direction based on the push handle position. The automatic direction-limiting mechanism uses the positional relationship between the push handle and wheel assembly to autonomously determine which wheels should be locked, eliminating the need for manual intervention while maintaining simple operation
Solution Approach 2:
The direction-limiting mechanism is pre-configured with positioning grooves and automatic positioning members that are positioned in advance. When the push handle is moved to a specific position, the mechanism is already prepared to automatically engage and limit the wheel rotation direction, eliminating the need for real-time manual adjustment
2Adaptability or versatility
If the push handle is switched between front and rear positions, then the adaptability improves, but the device complexity worsens because automatic direction limiting is required
Solution Approach 1:
The automatic direction-limiting mechanism serves multiple functions: it automatically locks the trailing wheels to prevent rotation, maintains the positional relationship between the push handle and wheel assembly, and adapts to different push handle positions (front and rear). This single mechanism handles all direction-limiting requirements for both push handle positions, avoiding the need for separate control systems
Solution Approach 2:
The mechanism dynamically adapts to the push handle position through its automatic positioning members that can engage or disengage based on the relative position between the push handle and wheel assembly. The positioning grooves and resilient members allow the system to automatically transition between different operational states, providing adaptability without complex control logic
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 effortless control of the stroller's moving direction by automatically limiting the wheels' direction when the push handle is switched, ensuring smooth operation and ease of use.
Implementation Method 1
a resilient member biased the automatic positioning member toward the rotating portion
Data Source
AI summary
A direction changeable stroller comprises a frame unit that includes a side leg frame and a push handle pivotable between front and rear positions. The side leg frame includes front and rear leg tubes, and front and rear wheel assemblies. Each of the front and rear wheel assemblies includes a wheel seat and a wheel. Each of the wheel seats includes a fixed portion connected fixedly to a corresponding one of the front and rear leg tubes, and a rotating portion connected pivotably to the fixed portion. The side leg frame further includes an automatic direction-limiting mechanism connected to the push handle such that, when the push handle is at a selected one of the front and rear positions, relative rotation between the fixed portion and the rotating portion of a corresponding one of the front and rear wheel seats is prevented.