Limit Switch Box Position Indicator With Adjustable Mask Apertures
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Solution Overview
Problem
Existing visual position indicator assemblies for limit switch boxes cannot be adjusted to accommodate different angular strokes of valves and actuators, leading to inaccurate display of operation conditions and high manufacturing and installation costs due to the lack of standardization.
Innovation Solution
A rotatable mask configuration within the visual position indicator assembly allows for adjustable angular alignment of apertures to match the specific angular stroke of the indicator element, enabling the same assembly to be used with various valves and actuators, while a protective cap enhances water resistance and simplifies assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the indicator element is keyed on the shaft at a fixed angular position and the mask is fixed on the container by screws, then the assembly structure is simple and standardized, but the visual position indicator assembly cannot adapt to different angular strokes of various valves and actuators
Solution Approach 1:
The mask is made rotatable relative to the indicator element through a series of nested components: the first mask rotates on the shaft, the second mask rotates on the first mask, and the third mask rotates on the second mask. This dynamic configuration allows the aperture alignment to be adjusted to match different angular strokes of various valves and actuators, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The patent employs a nested structure where multiple masks are fitted one inside another (second mask inside first mask, third mask inside second mask). Each mask can rotate independently on its predecessor, creating a compact multi-degree-of-freedom adjustment mechanism that maintains standardized components while achieving adaptability to different angular positions.
2Productivity
If a same control device is used with a plurality of valves and actuators that determine different angular strokes, then device standardization is achieved, but the visual position indicator assembly cannot properly visualize the operation conditions of all valves and actuators
Solution Approach 1:
The rotatable masks enable the aperture alignment to be dynamically adjusted for each specific valve or actuator application. This allows a single standardized control device to achieve precise visualization accuracy for different angular strokes by rotating the masks to the appropriate angular positions, thereby resolving the contradiction between standardization and measurement precision.
Solution Approach 2:
The patent changes the angular parameter of the mask apertures through rotation to match different angular stroke parameters of various valves and actuators. This parameter adjustment allows the same standardized device to accurately visualize different operation conditions by altering the angular orientation of the visible sectors.
3Adaptability or versatility
If multiple masks with rotatable configurations are added to enable angular adjustment, then adaptability to different valves and actuators is improved, but the assembly and manufacturing complexity increases
Solution Approach 1:
The nested mask configuration allows all rotatable adjustment components to be contained within a compact structure. Each mask is fitted inside the previous one, creating a space-efficient design that reduces the overall size while maintaining multiple degrees of freedom for angular adjustment, thus mitigating the manufacturing complexity issue.
Solution Approach 2:
The patent divides the adjustment function into multiple independent rotatable masks, each capable of being adjusted separately. This segmentation allows for modular manufacturing and assembly, where each mask can be produced and adjusted independently, potentially simplifying the overall manufacturing process despite the increased number of components.
Data Source
AI summary
A visual position indicator assembly for limit switch boxes is provided. The indicator assembly has an indicator element configured to be fitted to a shaft of a driving assembly of a limit switch box, and the indicator element has a plurality of adjacent sectors featuring different colors and/or writings. The visual position indicator assembly further has a first mask and a second mask that are both provided with through apertures having the same size and arrangement and that are fitted coaxially to each other. One between the first mask and the second mask is rotatable with respect to the other one. Thanks to this configuration, it is possible to vary the angular width of the through apertures in order to adapt it to the real angular stroke of the indicator element.