Spherical Tension Adapter Self-Alignment
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Solution Overview
Problem
Existing tension test accessories for materials testing machines are complex, expensive, and labor-intensive to install, with issues of concentricity uncertainty and space consumption due to multiple components and undesirable spherical seat placement within the test space, leading to resistance and safety hazards.
Innovation Solution
A spherical tension alignment device comprising a shank with a convex spherical bearing surface and a sleeve with a concave spherical bearing surface, allowing for self-alignment and reduced resistance, positioned away from the test space, and designed for easy adaptation and maintenance with a high-strength metal construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional spherical washer assembly with multiple components is used, then the tension rod can be installed, but the device becomes complicated, expensive, and labor-intensive to install and adjust
Solution Approach 1:
The patent combines the spherical washer assembly and tension rod into a single integrated spherical tension adapter component. The adapter includes a body with a spherical seat and a threaded shank as unified structures, eliminating the need for separate spherical washers, nuts, and multiple fasteners. This merging reduces the number of parts from multiple components to a single unit, simplifying installation and adjustment while maintaining reliable tension force application.
Solution Approach 2:
The spherical tension adapter is designed with a universal interface that can accommodate various test accessory configurations. The threaded shank accepts different thread types and the spherical seat works with various alignment requirements, making it adaptable to different test machines and accessories without requiring custom components for each application.
2Manufacturing precision
If multiple high precision concentric surfaces are machined for the spherical washer and tension rod, then the assembly can function, but the manufacturing cost increases and concentricity uncertainty increases
Solution Approach 1:
By integrating the spherical seat and threaded shank into a single machined body, the patent reduces the number of concentric surfaces that must be precision-machined. Instead of machining concentric surfaces on separate spherical washers and tension rods, only the critical spherical seat and shank interface surfaces in the integrated body require high precision, reducing overall manufacturing complexity and cost while maintaining necessary concentricity.
Solution Approach 2:
The patent specifies precise geometric parameters for the spherical seat (radius, curvature) and threaded shank (thread type, pitch, tolerance) that optimize both manufacturing feasibility and functional performance. These parameter specifications balance the need for sufficient precision with practical manufacturing capabilities, reducing costly ultra-precision machining requirements while ensuring proper function.
3Ease of operation
If the spherical seat is placed inside the test space, then the tension rod can be installed, but it consumes test space and creates resistance to self-alignment
Solution Approach 1:
The patent extracts the spherical seat from the test space by positioning it on the external surface of the crosshead, away from the internal test volume. The threaded shank extends through the crosshead to provide the tension interface, while the spherical seat remains externally mounted. This extraction eliminates the spherical seat's occupation of test space and reduces resistance to self-alignment by allowing greater angular freedom for the shank during loading.
4Adaptability or versatility
If a large spherical radius is used, then the spherical seat can accommodate alignment variations, but it results in significant resistance to self-alignment
Solution Approach 1:
The patent specifies an optimized spherical radius parameter that balances alignment tolerance with self-alignment resistance. Rather than using a large radius that increases tolerance but also increases resistance, the design selects a specific radius value that provides sufficient alignment accommodation while minimizing friction and resistance during the self-alignment process. This parameter optimization resolves the trade-off between adaptability and ease of operation.
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 device ensures accurate tension force application with reduced resistance and improved safety by allowing self-alignment and maintaining alignment during testing, while being simpler to use and cost-effective, suitable for a variety of test accessories and machines.
Implementation Method 1
The surface of the shank which is surrounded by the sleeve, immediately adjacent to the first end, is turned down to a diameter to allow a range of freedom between the shank and sleeve, expressed in degrees of rotation from the vertical
Data Source
AI summary
A tension adapter is disclosed for a materials testing machine. The tension adapter includes a shank and a sleeve. The shank includes an enlarged head with a machined convex spherical bearing surface which forms a ring around the periphery adjacent to one end of the shaft. The opening of the sleeve includes a machine concave spherical bearing surface around the periphery thereof to form a seat for the convex spherical bearing surface. The sleeve further includes inner walls which are conical in order to allow the shank to rotate or pivot from the vertical orientation about the pivot point formed by the spherical bearing surfaces. The rotation or pivoting of the shank allows the tension adapter to align so that only tension forces are applied during materials testing.