Golf Insole Asymmetric Heel Elevation for Swing Stability
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Solution Overview
Problem
Existing golf insoles fail to effectively maintain the appropriate inclination angle and smooth rotation of the axis of motion during a golf swing, leading to missed shots due to inadequate support from the adductor muscles, which are weakened by lack of use and age, causing the ball of the foot to rise and weight to shift improperly.
Innovation Solution
A pair of golf insoles with specific cross-sectional inclinations and height differences between the thumb base, inner heel, outer heel, and little finger base, designed to maintain an inclination angle of 4 to 8 degrees, suppressing the lifting of the ball of the foot and weight shift, made from hardening ethylene vinyl acetate or polyurethane with elastic urethane and synthetic fibers for improved grip and reduced fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ball of the foot is molded into a mortar shape to promote smooth rotation, then rotation of the axis of motion is improved, but the ball of the foot rises and weight shifts toward the little finger side, making it difficult to maintain the inclination angle
Solution Approach 1:
The insole applies different height elevations to specific regions: the outer heel is raised by 5-10mm while the inner heel is raised by 2-5mm, creating localized structural modifications that collectively maintain the 4-8 degree inclination angle while supporting proper weight distribution and rotation
Solution Approach 2:
The insole employs asymmetric height differences between the outer and inner heel regions, with the outer heel being higher than the inner heel. This asymmetric structure creates the necessary 4-8 degree inclination angle while preventing the ball of the foot from rising during rotation
2Use of energy by moving object
If the outer side of the heel is raised to shift weight to the toe, then weight transfer is improved, but the little finger side of the sole remains lower, causing the center of gravity to shift toward the little finger due to foot structure
Solution Approach 1:
The insole raises both the outer heel (5-10mm) and inner heel (2-5mm) by different amounts, creating localized structural support that shifts weight to the toe while maintaining proper center of gravity alignment and preventing collapse toward the little finger side
3Ease of operation
If simply making the outside of the sole higher than the inside is done to correct swing form, then swing form correction is improved, but the range of motion of the ankle is limited and weight shifts to the inside of the heel
Solution Approach 1:
The insole modifies the height parameter of the heel regions with precision: outer heel raised by 5-10mm and inner heel by 2-5mm, creating a controlled 4-8 degree inclination that corrects swing form while preserving full ankle range of motion through gradual, not abrupt, elevation
Data Source
AI summary
To provide an insole that promotes maintenance of the inclination angle and rotation of a motion axis, which is a rotation axis of the inside of both feet, in a golf swing. By making the thickness of the insole the lowest at the base of the thumb (A), and then gradually increasing the thickness from the medial heel (B), lateral heel (C), and little finger base (D), the thickness of the insole is the lowest, and the thickness is gradually increased to the base of the little finger (D). By maintaining the inclination angle of the ball of the foot and preventing the ball of the foot from lifting due to centrifugal force caused by the swing, the center of gravity is prevented from moving toward the little finger, and smooth rotation from the ball of the foot is promoted.