Collapsible Stroller Trigger Handle Hub Mechanism
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Solution Overview
Problem
Existing collapsible strollers have complex designs that make it difficult for users to easily attach and remove the basket or seat, compromising user friendliness.
Innovation Solution
A collapsible stroller design featuring a front axle frame, rear axle frame, handlebar frame, cable, spring, and hub assemblies with rotating attachment points and camming surfaces, allowing for easy detachment and reattachment of the seat or basket through a trigger and twist handle mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex folding mechanism with multiple rotatable members, gears, and cam-fold units is used, then the stroller can be collapsed, but the design complexity increases and user friendliness decreases
Solution Approach 1:
The folding mechanism is divided into two independent hub assemblies, each handling one side of the stroller frame. Each hub assembly contains its own camming surface plate, release pin, and spring, allowing the left and right sides to fold independently and simultaneously, simplifying the overall mechanism while maintaining collapsing capability
Solution Approach 2:
The mechanism uses dynamic elements including a rotatable handle that converts rotational motion into linear cable tension, springs that provide automatic return force, and camming surfaces that convert linear motion into rotational folding motion. This dynamic design allows smooth, controlled collapsing and unfolding without complex mechanical linkages
2Adaptability or versatility
If a complex folding mechanism with multiple rotatable members and geared coordination is used, then the stroller can be collapsed, but the ease of operation deteriorates
Solution Approach 1:
The spring-loaded release pins automatically engage with the camming surface plates when the handle is rotated, and the springs automatically return the hub carriers to their starting positions after folding. This self-service mechanism eliminates the need for users to manually manipulate multiple components, significantly improving ease of operation while maintaining collapsing functionality
Solution Approach 2:
Cables act as intermediaries connecting the rotatable handle to the hub carriers, translating the user's simple rotational input into the coordinated folding motion of both sides of the stroller. This intermediary mechanism simplifies user interaction to a single rotational action while achieving complex coordinated folding
3Adaptability or versatility
If multiple rotatable members with disks and notches are used for folding, then the stroller frame can be collapsed, but the attachment and removal of basket or seat becomes difficult
Solution Approach 1:
The hub assemblies are designed with pre-positioned camming surfaces and release pins that are ready to engage when the handle is rotated. The springs are pre-loaded to provide immediate return force. This preliminary preparation allows the folding mechanism to respond instantly to user input, making seat attachment and removal as easy as the folding operation itself
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
The design simplifies the attachment and removal process, enhancing user friendliness by reducing the complexity of the stroller's folding mechanism while maintaining structural integrity and ease of use.
Implementation Method 1
a spring, and a spaced pair of identically configured hub assemblies. Each hub assembly includes a rotating attachment point for the front axle frame member, a rotating attachment point for the handlebar frame member, a fixed attachment point for the rear axle frame member, a camming surface plate including a camming surface and a release pin engagement slot, and a release pin located partially in a hub carrier including a connection point for one end of the cable, the hub carrier biased by the spring.
Data Source
AI summary
A collapsible stroller is disclosed, including a front axle frame member, a rear axle frame member, a handlebar frame member, a handlebar, and a hub. The hub includes a rotating attachment point for the front axle frame member, a rotating attachment point for the handlebar frame member, a fixed attachment point for the rear axle frame member. A cable connects the hub, and a rotatable handle on the handlebar frame member. When the rotatable handle is rotated, the cable causes the hub to collapse in two stages.