Oversized Plug Sandal Sole Attachment
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Solution Overview
Problem
Existing sandals with toe thongs often experience the central plug being pulled through the sole during wear, leading to structural failure due to pressure, as the plugs are typically larger than the holes but not securely anchored.
Innovation Solution
A sandal design featuring an oversized front plug and side straps with rear plugs, where the front plug is significantly larger than prior designs, and a unique manufacturing method where the front plug does not pass through any holes in the sole, ensuring secure attachment and preventing pullouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front plug is made larger than the hole to prevent separation, then the toe thong is secured to the sole, but the plug can still be pulled through the hole during wear under pressure
Solution Approach 1:
The front plug is divided into two functional parts: a larger head portion that prevents pullthrough and a smaller shank portion that fits through the hole. This segmentation allows the plug to simultaneously achieve secure attachment (head larger than hole) and passability (shank smaller than hole), resolving the contradiction between attachment security and resistance to pullout force
Solution Approach 2:
Instead of making the entire plug small enough to pass through the hole (conventional approach), the invention inverts the approach by making the main body of the plug larger than the hole and only the insertion portion smaller. This inversion allows the plug to be secured more effectively while still being installable, thereby improving both reliability and strength
2Reliability
If the plug is significantly larger than the hole to prevent pullouts, then attachment security improves, but the plug cannot be pulled through the hole during manufacturing
Solution Approach 1:
The plug is segmented into a head portion (larger than hole) and a shank portion (smaller than hole). The shank passes through the hole during manufacturing while the head remains outside to provide secure attachment. This segmentation resolves the contradiction by allowing both easy manufacture (shank fits through) and high reliability (head prevents pullout)
Solution Approach 2:
The shank portion acts as an intermediary element that facilitates the passage of the plug through the hole during manufacturing. By making the shank smaller than the hole while keeping the head larger, the shank serves as a mediator that enables easy installation while the head provides the necessary security against pullout during use
3Ease of manufacture
If the plug is made small enough to pass through the hole, then manufacturing is easier, but the toe thong can separate from the sole during wear
Solution Approach 1:
The plug is divided into a head portion (provides security) and a shank portion (enables easy installation). The head is made larger than the hole to prevent separation, while the shank is made smaller to facilitate easy passage through the hole during manufacturing, thus resolving the contradiction between ease of manufacture and attachment security
Solution Approach 2:
Different parts of the plug are given different sizes and functions: the head portion is locally optimized for security (larger than hole) while the shank portion is locally optimized for installation (smaller than hole). This local differentiation resolves the contradiction by allowing each part to fulfill its specific function without compromising the other
Data Source
AI summary
A sandal has a sole with a front hole and a pair of rear holes, a toe thong that includes a center portion and a pair of side straps, the center portion having an oversized front plug, and each of the side straps having a rear plug.