Multi-Track Bearing Distributes Pressure in Folding Knife
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Solution Overview
Problem
Folding knives with single-track ball bearings concentrate pressure on protruding ball portions, leading to potential failure and malfunction when the balls or bearing fail.
Innovation Solution
A multi-track bearing system with balls positioned along multiple circular paths, distributing pressure more evenly and increasing longevity by forming guides through concentric movement, which enhances the durability and usability of the folding knife.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single track of balls is used in the bearing, then the device complexity is reduced, but the reliability deteriorates because all pressure is forced on protruding portions of the balls causing potential failure
Solution Approach 1:
The bearing is segmented into multiple tracks (at least two tracks) instead of a single track, distributing the balls into separate concentric circular paths. This segmentation allows pressure to be distributed across multiple ball surfaces rather than concentrating all force on protruding portions of a single track, thereby improving reliability while maintaining reasonable structural complexity.
2Reliability
If multiple tracks of balls are used in the bearing, then the reliability is improved by distributing pressure, but the device complexity increases
Solution Approach 1:
The bearing design transitions from a single-dimensional track to a multi-dimensional arrangement with at least two concentric circular tracks. This dimensional expansion allows pressure distribution across multiple ball surfaces while maintaining a compact cylindrical structure, improving reliability without proportionally increasing overall device complexity.
3Ease of manufacture
If a single track of balls is used, then the ease of manufacture is improved, but the duration of action deteriorates due to increased wear on protruding portions
Solution Approach 1:
The bearing is divided into multiple tracks with balls positioned at different radial distances from the center. This segmentation distributes contact pressure across multiple ball surfaces during folding and unfolding cycles, reducing wear on individual balls and extending the operational lifespan of the blade mechanism.
Solution Approach 2:
Balls in different tracks are positioned at different radial distances from the center of the bearing, creating local variations in pressure distribution. Balls in the first track experience different pressure conditions than balls in the second track, allowing each ball to operate under optimized local conditions that reduce overall wear and extend service life.
Data Source
AI summary
Disclosed are various embodiments for a multi-track bearing folding knife or folding tool. In various embodiments, a folding knife has a handle having a first side with a first side inner surface and a second side with a second side inner surface and a blade rotatably coupled to the handle, where the blade is configured to rotate from a closed position and an open position. A multi-track bearing may be disposed between the handle and the blade. The multi-track bearing may include a first plurality of balls positioned along a first circular path and a second plurality of balls positioned along a second circular path. The balls of the multi-track bearing may protrude from both a first side of the bearing and a second side of the bearing to contact two surfaces. A first guide and a second guide may be formed by a periodic rotation of the blade.