Injection-Moulded Connecting Structure for Hand-Held Metal Detector
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Solution Overview
Problem
Traditional screw fastening arrangements on hand-held metal detectors slip over time due to friction loss, leading to unreliable connections and increased weight when using anti-slip features or non-circular shafts, which compromise the detector's reliability and efficiency in harsh outdoor environments.
Innovation Solution
The use of injection-moulded connecting structures with rails, teeth, and grooves directly integrated onto a lightweight tubular shaft, eliminating the need for fasteners and providing a secure, vibration-resistant bond between components without adding weight, using thermoplastic polymers reinforced with minerals and fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional screw fastening arrangements are used to connect components to the shaft, then the connection is initially secure with friction grip of 9-11 Nm, but the friction grip falls off over time due to plastic creep causing the connection to slip
Solution Approach 1:
The patent replaces the mechanical screw fastening system with a chemical bonding system using adhesive. The adhesive is applied between the attachment and the shaft, creating a permanent bond that eliminates the problems of friction grip loss and plastic creep. This substitution transforms the connection mechanism from mechanical friction-based to chemical adhesion-based, providing long-term reliability without slipping.
Solution Approach 2:
The patent introduces aperture features in the shaft that allow adhesive to penetrate and create anchoring points. The adhesive is segmented into multiple bonding zones along the shaft-attachment interface, including end regions and intermediate regions. This segmentation of the bonding interface enhances the overall connection strength and prevents slip by creating multiple independent bonding zones.
2Stability of the object's composition
If anti-slip features such as apertures are added to the shaft to prevent fastener slippage, then connection stability is improved, but clearance between the fastener and aperture results in undesirable movement
Solution Approach 1:
The patent replaces the mechanical fastener system with adhesive bonding, eliminating the clearance and alignment issues between fasteners and apertures. The adhesive flows into the aperture features and creates a continuous bonding interface that eliminates gaps and undesirable movement, achieving both stability and precision without the limitations of mechanical fastening.
3Strength
If anti-slip features are made stronger and more wear resistant to prevent damage through repeated usage, then durability is improved, but the materials used increase the weight of the detector
Solution Approach 1:
The patent replaces mechanical anti-slip features with adhesive bonding, eliminating the need for heavy, wear-resistant mechanical components. The adhesive provides sufficient bonding strength without requiring additional heavy materials, thus maintaining detector weight efficiency while achieving the required connection strength and wear resistance.
4Stability of the object's composition
If square or non-circular shafts are used to prevent rotation between connecting structure and shaft, then rotational stability is improved, but volume efficiency decreases and weight increases
Solution Approach 1:
The patent replaces mechanical rotational prevention features (such as square shafts) with adhesive bonding. The adhesive creates a bonded interface that prevents relative rotation between the shaft and connecting structure without requiring non-circular cross-sections. This maintains the optimal circular shaft geometry for volume efficiency and weight while achieving the required rotational stability through chemical adhesion.
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
This solution ensures a robust, lightweight metal detector with firmly connected components that resist movement and wear, maintaining reliability and efficiency without the need for fasteners, reducing assembly complexity and weight, while maintaining structural integrity.
Implementation Method 1
a first connecting structure moulded directly onto the elongated body at the first end through an injection moulding process
Data Source
AI summary
Provided is a body of a hand-held metal detector which includes an elongated body with a first and second end; and a first connecting structure moulded directly onto the elongated body at the first end through an injection moulding process. The connecting structure includes an engaging portion configured to engage at least one attachment of the hand-held metal detector, such that the at least one attachment is supported by the elongated body through the connecting structure moulded directly onto the elongated body.