Rotating Wagon Handle Linkage for Pinch-Free Mode Switching
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Solution Overview
Problem
Existing wagons with rotating handles often have structures that allow only one position locking, creating pinch points and limiting versatility for push, pull, and storage modes.
Innovation Solution
A rotatable handle with a linkage system that allows for multiple locking positions, enabling the handle to rotate between push, pull, and storage configurations, with a linkage secured to the frame below the bottom frame for smooth rotation and interference avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-position locking structure is used for the handle, then the structure is simple, but the versatility for push, pull, and storage modes is limited
Solution Approach 1:
The handle is designed to be dynamically adjustable with multiple locking positions (push position, pull position, and storage position) rather than being fixed in a single position. This allows the handle to adapt to different usage modes while maintaining structural integrity through the linkage mechanism with multiple locking points.
Solution Approach 2:
The handle assembly is designed to perform multiple functions through a single unified structure that can lock into different positions. The linkage mechanism serves both as a structural connector and as a multi-position locking system, enabling the handle to function in push mode, pull mode, and storage mode without requiring separate mechanisms for each function.
2Reliability
If a cradle structure is used to lock the handle, then the handle can be locked in position, but pinch points are created reducing safety
Solution Approach 1:
The traditional cradle structure that creates pinch points is removed and replaced with a linkage-based locking mechanism. The linkage system achieves handle stabilization through geometric constraints and locking points without requiring enclosed cradle structures that trap fingers or create pinch hazards.
Solution Approach 2:
The linkage mechanism acts as an intermediary between the handle and the frame, providing a safe intermediate path for force transmission and position locking. Instead of direct cradle-to-handle contact that creates pinch points, the linkage system mediates the connection through multiple safe contact points and geometric constraints.
3Ease of operation
If the linkage is secured above the bottom frame, then the structure is simpler, but rotation is restricted causing interference
Solution Approach 1:
The linkage is repositioned from a vertical arrangement (above the bottom frame) to a horizontal arrangement (below the bottom frame). This dimensional change in the securing location allows the linkage to rotate through the necessary range of motion without interfering with the wagon body or seat structure, while still providing effective handle position control.
Data Source
AI summary
Embodiments of the present disclosure are directed to a wagon for transporting a baby or small child in the wagon, including a handle that can be rotated to various positions. For example, the handle of the wagon can be used in a push position, where the handle is fixed and extends behind the wagon and upwards towards a user. The handle can be rotated relative to a wagon frame, in some cases up to or exceeding approximately 180 degrees, so that the handle can move between pull and storage positions. In the pull position, the handle can be non-fixed and allow for some rotation during pulling of the wagon. A linkage, which may include a curvature, can be used on each side of the wagon to selectively lock the handle in place relative to the frame for a particular mode, such as a push mode or storage mode.