Retention Nut System for Automated Laptop Disassembly
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Solution Overview
Problem
Conventional portable information handling systems are difficult to disassemble efficiently, making recycling and reuse of components costly and inefficient, with screws and complex cable configurations hindering automated disassembly and component separation.
Innovation Solution
A portable information handling system design that couples components without screws, using a single keystone assembly for automated assembly and disassembly, and eliminating internal cables by integrating functions such as speaker signals and battery power into a membrane with printed circuit board, allowing robotic arms to sort components for reuse, refurbishment, and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws are used to assemble housing and processing components, then system robustness and impact resistance are improved, but system disassembly difficulty and recycling cost increase
Solution Approach 1:
The housing is divided into modular sections (main housing, lid housing, keyboard assembly, display assembly) that can be independently separated. Each module is designed with standardized connection interfaces using retention nuts instead of traditional screw fastening, enabling automated disassembly while maintaining structural integrity during use.
Solution Approach 2:
Traditional screw-based mechanical fastening is replaced with a retention nut system that uses a specialized mechanical mechanism. The retention nut features a body with an opening and a lip that engages with a protrusion on the fastener, creating a snap-fit connection that can be automatically assembled and disassembled by robotic systems without requiring manual screw operation.
2Reliability
If conventional screw assembly is used, then component securement is improved, but automated assembly and disassembly efficiency deteriorate
Solution Approach 1:
The retention nut system is designed to be self-aligning and self-securing. The opening in the retention nut body allows the fastener to be inserted, and the lip automatically engages with the protrusion when the component is pushed into place, eliminating the need for manual tightening operations and enabling automated assembly lines to operate at higher speeds while ensuring reliable component securement.
3Ease of repair
If system breakdown is performed for recycling, then material reuse potential is improved, but separation cost and complexity increase
Solution Approach 1:
The system is segmented into distinct functional modules (housing, keyboard, display, processing components) that can be easily separated for recycling. Each module uses the same retention nut fastening system, creating a standardized disassembly process that reduces complexity. The modular design allows recycling facilities to efficiently separate materials by module type without dealing with complex cable routing and connector disconnection.
Data Source
AI summary
A portable information handling system is assembled and disassembled by a keystone assembly that couples at an upper surface of the portable housing to overlap a keyboard assembly that covers processing components disposed in the portable housing. A motherboard couples to the portable housing under the keyboard assembly with openings aligned to insert over retaining nuts extending from the housing, the retaining nuts having a lip to engage the motherboard, a stop feature to define motherboard sliding movement and an alignment feature to align the lip and stop feature in a predetermined configuration. A cooling fan couples to the motherboard adjacent to one side to retain the motherboard in the engaged position and is removed to allow the motherboard to slide to the released position.