Secure Hinge for Motorcycle Case Using Segmented Pin
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Solution Overview
Problem
Existing cycle and motorcycle cases with hinges suffer from issues such as inconsistent friction over time, leading to security vulnerabilities and ineffective hardness adjustments, which can be compromised by unscrewing and removing pins, allowing easy opening and theft.
Innovation Solution
A secure hinge design featuring sectioned hollow cylinders and bushes with matching teeth that prevent rotation and disassembly, ensuring the lid remains at a preferred angle and provides enhanced security against theft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If screw adjustments are inserted in the pins to maintain hardness adjustment, then the lid can remain open at any tilting angle, but the case can be easily opened by unscrewing and removing the pins, cancelling security
Solution Approach 1:
The pin is divided into two separate components: a threaded pin body that remains fixed in the hinge, and a removable cap that provides the adjustment mechanism. This segmentation allows the adjustment function to be accessed without compromising the security of the main pin, which remains permanently secured in the hinge assembly.
Solution Approach 2:
A cap is introduced as an intermediary component that interfaces with the threaded pin. The cap can be removed and reattached to adjust the friction characteristics of the hinge, while the main pin body with its threaded portion remains permanently fixed. This intermediary allows adjustment functionality without exposing the security-critical pin to removal.
2Ease of operation
If the threaded pin is allowed to rotate with the hinge, then the hinge can move freely, but the nut is unscrewed making the hardness adjustment ineffective
Solution Approach 1:
The threaded adjustment portion is extracted from the rotating hinge assembly and placed in a stationary component (the cap or housing). This allows the hinge and pin body to rotate freely for normal operation, while the extracted threaded portion remains stationary to maintain the friction adjustment setting.
Solution Approach 2:
The friction adjustment is performed in advance by positioning the cap at the desired location on the threaded pin body, before the hinge enters use. Once adjusted, the cap remains fixed relative to the pin body, pre-setting the friction characteristics for the entire operational period without requiring continuous adjustment during hinge rotation.
3Ease of operation
If high friction hinges are used to maintain lid at intermediate positions, then the lid can remain open at any tilting angle, but the friction surfaces are consumed over time, varying mechanical features
Solution Approach 1:
The friction parameter of the hinge is made adjustable through the threaded cap mechanism. Users can modify the friction characteristics by changing the position or tightness of the cap on the threaded pin, allowing optimization between easy opening and position maintenance capabilities. This adjustable parameter approach replaces fixed high-friction surfaces that degrade over time.
Data Source
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AI summary
Case (100) for cycle or motorcycle comprising a lid (102), a bottom (103) and at least one folding hinge (10) comprising two upper portions (20, 30) and comprising a sectioned hollow cylinder (200, 300) pivoted by a threaded pin (40) screwed with a nut (50), two bushes (60, 70) with a matching tooth (62, 72), wherein a first section (201) and a last section (207) of the sectioned upper hollow cylinder (200) comprise a through opening (260, 270) housing the body of the respective bush (60, 70).