Bushing Leg Center Column for Fixture Stress Resistance
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Solution Overview
Problem
Existing fixtures lack strong tolerance to vertical stress, shear stress, and torsional stress due to inadequate design features such as the absence of a columnar construction inside the leg part and openings for elastic locking pieces that reach to the back of the flange, leading to weak resistance against these types of inputs.
Innovation Solution
A fixture design featuring a pin and bushing with a leg part having shaft-part receiving openings, outer walls with elastic engagement claws, and a leg center column that connects opposing outer wall portions, providing increased cross-sectional area and bifurcated spaces for the pin, along with a closed end construction to enhance resistance to vertical, shear, and torsional stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a columnar construction is not disposed inside the leg part of the bushing, then the device complexity is reduced, but the tolerance to shear stress becomes weak
Solution Approach 1:
The leg part is segmented into multiple functional zones: the leg center column provides a central load-bearing element, while the bifurcated spaces on either side accommodate elastic engagement claws. This segmentation allows each component to specialize in resisting specific stress types, collectively achieving strong shear stress tolerance without requiring an overly complex monolithic structure.
Solution Approach 2:
The leg part combines different structural elements (leg center column, outer walls, elastic engagement claws) into a composite construction that leverages the strengths of each component. The leg center column provides rigid support for vertical and shear loads, while the elastic engagement claws provide flexible retention, creating a composite structure with superior overall performance.
2Strength
If an opening for forming elastic locking pieces reaches from the shaft part to the back of the flange, then the ease of manufacture is improved, but the tolerance to torsional input becomes weak
Solution Approach 1:
The opening is strategically positioned only in the leg part where elastic engagement claws are needed, rather than extending through the entire bushing structure. This localized opening provides the necessary functionality for elastic locking piece formation while maintaining structural integrity in the flange and shaft part regions, thereby preserving torsional stress tolerance.
3Strength
If the cross-sectional area of the leg part is increased, then the tolerance to vertical stress and shear stress is improved, but the volume of the bushing increases
Solution Approach 1:
Instead of uniformly increasing the leg part's cross-sectional area in all directions, the design extends the leg center column vertically and creates bifurcated spaces that utilize the available volume efficiently. This dimensional optimization increases the effective load-bearing area for vertical and shear stresses without proportionally increasing the overall bushing volume.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves improved tolerance to vertical stress, shear stress, and torsional stress by distributing forces effectively through the increased cross-sectional area and bifurcated spaces, providing enhanced stability and resistance compared to prior art fixtures.
Implementation Method 1
a pair of opposing elastic engagement claws disposed on a portion of the outer walls
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A fixture (1) comprises a pin (2) and a bushing (3), and the bushing (3) comprises a flange (8) and a leg part (9). The leg part (9) has shaft-part receiving openings (10) for receiving shaft parts (7) of the pin (2), and the shaft-part receiving openings (10) are enclosed by an outer wall (11) having a rectangular cross-section. A pair of opposing elastic engagement claws (12a, 12b) are disposed at a pair of opposing outer wall portions (11 a, 11 b) of a portion of the outer wall (11). A leg center column (13) is disposed between the shaft-part receiving openings (10), and the leg center column (13) connects the pair of opposing outer wall portions (11 a, 11 b) and another pair of perpendicular outer wall portions (11c, 11 d) with each other.