Retractable Pocket Clip for Snag-Free Knife Retention
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Solution Overview
Problem
Conventional pocket knife clips are prone to snagging, aesthetically unappealing, and inconvenient to use, as they protrude from the pocket and do not securely retain the knife, leading to potential damage and discomfort.
Innovation Solution
A retractable pocket clip that moves in an arc within the same pivot plane as the folding blade, automatically deploying and retracting with the blade's movement, sheltered from snagging hazards and providing a unique retentive tendency through compression along the pocket edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid pocket clip is used to retain the knife, then retention strength is improved, but the clip protrudes conspicuously and snags on objects
Solution Approach 1:
The pocket clip is made movable rather than fixed, allowing it to pivot between extended and retracted positions. The clip can dynamically adjust its position based on whether the knife is being carried or accessed, eliminating snagging when retracted while maintaining retention when extended.
Solution Approach 2:
The clip assembly is divided into separate functional components: a retention element that engages the pocket and a knife-retaining element that contacts the knife body. This segmentation allows independent optimization of each function and enables the clip to retract flush with the knife surface when not in use.
2Object-affected harmful factors
If a retractable clip pivoting perpendicular to the blade pivot plane is used, then snagging is reduced, but the space between clip and knife decreases toward the pivot point causing the clip to protrude at increasing angles
Solution Approach 1:
The clip's movement is constrained to occur within the same pivot plane as the blade, rather than perpendicular to it. This dimensional alignment ensures that the clip remains coplanar with the knife body throughout its retraction stroke, preventing the increasing protrusion angle problem while maintaining snag-free operation.
3Strength
If a retractable clip binding the object toward the pivot point is used, then the object is retained, but the pinching area is small and the knife can easily become dislodged
Solution Approach 1:
The retention mechanism is segmented into a pocket-engaging portion and a knife-retaining portion. The knife-retaining element contacts the knife body at multiple points along its length rather than concentrating force at the pivot point, distributing the retention force over a larger area and preventing dislodgement.
4Extent of automation
If an actuating linkage with sliding friction surfaces is used to coordinate clip movement with blade movement, then automated deployment is achieved, but the device becomes complex and prone to fouling
Solution Approach 1:
The clip actuation mechanism is merged with the blade pivot mechanism itself. The blade's rotational movement directly drives the clip's retraction through a simple cam-like interaction between the blade tang and clip, eliminating the need for separate linkages, sliders, and friction surfaces while achieving automated operation.
5Strength
If the clip is extended perpendicular to the mean exterior surface of the pocket, then retention is achieved, but the clip becomes prominent and exposed to snagging hazards
Solution Approach 1:
The clip dynamically changes its orientation and position based on operational state. When retracted, it lies substantially within the mean exterior surface of the pocket, minimizing exposure to snagging hazards. When extended, it protrudes perpendicular to the knife surface to engage the pocket edge for retention.
Data Source
AI summary
A folding knife with retractable pocket clip that moves in an arc between retracted and deployed positions generally within the same pivot plane as a pivotally folding blade and whose movement between retracted and deployed positions is coordinated through direct contact with the blade so that the clip is automatically deployed for use as the blade is pivoted into a storage position and automatically retracted when the blade is pivoted to a position for use. The pocket clip is configured to be uniquely sheltered from snagging hazards and to secure the folding knife to a pocket by means of a unique retentive characteristic resulting from localized tension advantageously generated along the pocket edge and maintained by compression exerted upon the body of the knife as it rests within the pocket.