Tool-less Scooter Frame Assembly via Nested Sleeve Mechanism
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Solution Overview
Problem
Conventional scooter assembly requires multiple tools and can be frustrating for consumers, leading to improper assembly and increased product returns due to skill dependence and tool availability issues.
Innovation Solution
A tool-less assembly system for scooters, featuring a sleeve assembly with inner and outer sleeves connected through a threaded mechanism, including spring clips and push pins, allowing for easy connection of the front and rear frames without tools, and a locking mechanism for rear wheels that uses a spring-biased locking element to secure the wheels to the axle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional assembly methods are used with multiple tools and fasteners, then connection strength and reliability are improved, but assembly complexity and difficulty increase significantly
Solution Approach 1:
The connection system is divided into modular components: a sleeve assembly with inner and outer sleeves, spring clips, and push pins. Each component performs a specific function (positioning, securing, or locking) allowing the overall connection to achieve strength through coordinated simple parts rather than complex fasteners
Solution Approach 2:
The spring clips and push pins are designed to be self-installing components that automatically secure the frame assemblies together through spring bias and friction engagement, eliminating the need for external tools or complex assembly procedures while maintaining reliable connections
2Ease of operation
If tool-less connectors are used, then ease of assembly is improved, but connection reliability may deteriorate
Solution Approach 1:
The inner sleeve is nested within the outer sleeve, creating a layered connection system where the inner sleeve provides initial positioning and the outer sleeve provides additional structural support and alignment, achieving reliable connection through nested simple components rather than complex tool-required fasteners
Solution Approach 2:
The spring clips utilize curved, flexible geometry that allows them to engage with the frame assemblies through elastic deformation and friction, providing reliable securement through shape and material properties rather than threaded or bolted connections
3Reliability
If multiple fasteners and connectors are used, then connection reliability is improved, but assembly time and skill requirement increase
Solution Approach 1:
Multiple connection functions (positioning, securing, and locking) are merged into a single integrated sleeve assembly that contains the inner sleeve, outer sleeve, spring clips, and push pins working together as one unit, allowing reliable connection to be achieved in a single assembly operation rather than through multiple separate fastening steps
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 quick, easy, and tool-free assembly of scooters, reducing the risk of improper assembly and product returns by simplifying the connection process and ensuring that consumers can assemble the scooter without specialized tools, thereby enhancing user experience and reducing manufacturing costs.
Implementation Method 1
The spring clip includes a spring bias such that when the spring clip engages the aperture, the spring clip moves and is received in the aperture, thereby positively connecting the inner sleeve and the fork stem
Implementation Method 2
The inner and outer sleeves may connect through a threaded connection
Implementation Method 3
The second tool-less connector includes a spring-biased push pin in one of the steering tube or fork stem and an aperture in the other of the steering tube or fork stem. When the push pin is received in the aperture, the steering tube and fork stem are positively connected together
Data Source
AI summary
A child vehicle includes a front frame having a handlebar with a steering tube and a front fork having a fork stem and a front wheel, a rear frame including a head tube and a rear wheel, and a sleeve assembly mounted to the front frame and engaging the rear frame to rotatably connect the front and rear frames in a tool-less manner. A method of tool-less assembly of a child vehicle includes inserting an end of the fork stem through the head tube, sliding an inner sleeve over the end of the fork stem and positively connecting the inner sleeve to the fork stem, sliding the outer sleeve over an end of the steering tube, connecting the steering tube to the fork stem, and connecting the outer sleeve to the inner sleeve. A child vehicle having a rear wheel connected to the vehicle in a tool-less manner and a method of achieving such a tool-less connection is also disclosed.