Injection-Molded Linear Slide Mechanism Without Bushings
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Solution Overview
Problem
Current linear slide mechanisms are complex, costly, and sensitive to contamination and misalignment due to high part count and material limitations, particularly in metal components, and require additional components like bushings, which increase complexity and cost.
Innovation Solution
An injection molded slide actuator assembly with a minimized part count, featuring a frame, slide carrier, and slide track member with oblong frustoconical side members and slanted surfaces, allowing for linear movement with reduced components and no bushings, enabling simplified assembly and reduced material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal components and bushings are used in linear slide mechanisms, then strength and durability are improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple functions into a single injection-molded plastic component that serves as both the structural housing and the sliding surface, eliminating the need for separate metal components and bushings. The plastic part integrates features that previously required multiple metal parts, thereby reducing device complexity while maintaining strength through optimized geometry and material selection.
Solution Approach 2:
The patent replaces traditional metal mechanical components with an injection-molded plastic mechanism that achieves similar functional outcomes. The plastic slide mechanism substitutes for metal parts and bushings, using molded-in geometric features to provide sliding surfaces and structural support, thereby reducing complexity while maintaining durability through appropriate material properties.
2Manufacturing precision
If high precision tolerances are required for linear slide mechanisms, then manufacturing accuracy is improved, but cost and manufacturing difficulty increase
Solution Approach 1:
The patent changes the manufacturing parameters by using injection molding to produce plastic components with built-in tolerance compensation features. The molding process allows for controlled shrinkage and dimensional variations to be accounted for in the design phase, achieving required precision without requiring extremely tight manufacturing tolerances that would increase cost and difficulty.
Solution Approach 2:
The patent segments the mechanism into modular injection-molded plastic components that can be manufactured independently with standard tolerances, then assembled together. This segmentation allows each component to be optimized for its specific function with appropriate tolerances, rather than requiring the entire mechanism to meet uniformly high precision requirements, thereby easing manufacturing.
3Ease of operation
If traditional linear slide mechanisms are used, then linear motion is achieved, but sensitivity to contamination and misalignment increases
Solution Approach 1:
The patent uses a closed-loop plastic housing structure that encloses the sliding mechanism, creating a protective barrier against contamination. The injection-molded plastic components form sealed chambers that prevent dust and debris from entering the sliding surfaces, thereby reducing sensitivity to contamination while maintaining smooth linear motion operation.
Solution Approach 2:
The patent incorporates misalignment compensation features directly into the injection-molded plastic components, such as compliant mounting surfaces and tolerance-built-in geometric features. These features beforehand accommodate potential misalignments between components, preventing binding and ensuring smooth operation without requiring extremely precise alignment during assembly.
Data Source
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AI summary
An injection molded slide actuator assembly which has a frame, a slide carrier and a slide track member. The injection molded slide actuator has an X, Y, and Z axis with the slide track member having at least one track slot extending along the y and the Z direction and said slide carrier having at least one cooperating outwardly extending side members for engaging the at least one track slot.