Limit Switch Assembly Drain Hole and Calibration Nut Design
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Solution Overview
Problem
Existing limit switch assemblies are prone to water stagnation and have a time-consuming calibration process due to their complex design, leading to increased costs and part count.
Innovation Solution
A simplified limit switch assembly design featuring a housing with a spring, calibration nut, and drain holes to prevent moisture accumulation and facilitate quick calibration, using a reduced number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing limit switch assembly design is used, then reliability is maintained, but water stagnation occurs within the switch housing
Solution Approach 1:
The patent extracts the harmful element (water) from the housing by incorporating drain holes that allow water to escape from the enclosed space, preventing water stagnation while maintaining the protective housing structure
Solution Approach 2:
The patent applies preliminary anti-action by pre-equipping the housing with drain holes and sealing mechanisms before water accumulation can cause harm, proactively preventing water stagnation rather than addressing it after the fact
2Reliability
If existing limit switch assembly design is used, then robustness is maintained, but calibration time is relatively time consuming
Solution Approach 1:
The patent segments the calibration function from the main housing by using a separate, adjustable calibration block that can be independently positioned and secured, allowing rapid calibration adjustments without disassembling or complexly manipulating the entire switch assembly
Solution Approach 2:
The patent applies preliminary action by pre-positioning the calibration block in standardized locations and providing pre-marked adjustment positions, so that calibration can be quickly performed by simply selecting and securing the block at the appropriate pre-determined position rather than requiring precise manual adjustment
3Reliability
If existing limit switch assembly design is used, then functional reliability is maintained, but number of parts is relatively high
Solution Approach 1:
The patent merges multiple functions into fewer components: the calibration block serves both as a calibration element and a positioning element, the housing integrates both protective enclosure and drainage functions, and the sealing mechanism is integrated into the housing structure rather than being a separate complex assembly
Solution Approach 2:
The patent applies universality by designing the calibration block to serve multiple purposes (calibration reference, positioning element, and adjustment mechanism), and the housing to provide both protection and active water management through integrated drain holes, reducing the need for separate dedicated components
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 effectively prevents water accumulation and streamlines the calibration process, reducing overall costs and part complexity while maintaining reliability.
Implementation Method 1
The spring is disposed within the inner volume of the housing and surrounds the bushing section. The spring engages the limit switch and the spring engagement surface.
Implementation Method 2
The drain hole is formed in the housing and extends between the inner and outer surfaces. The drain hole fluidly communicates the first volume to a surrounding environment.
Implementation Method 3
The calibration nut is threaded onto the bushing section and engages the first end of the housing.
Data Source
AI summary
A limit switch assembly includes a housing having a first end, a second end, an inner surface that defines an inner volume and a spring engagement surface, and an outer surface. A limit switch disposed within the inner volume includes a threaded bushing section at least partially extending from the first end. A spring within the inner volume surrounds the bushing section, and engages the limit switch and the spring engagement surface. A calibration nut threaded onto the bushing section engages the first end of the housing. A seal divides the inner volume of the housing into a first volume and a second volume. A drain hole formed in the housing fluidly communicates the first volume to a surrounding environment. A terminal assembly connected to the second end of the housing seals the second volume from the surrounding environment.