Rolling-ball tilt switch with segmented roller cavity
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Solution Overview
Problem
Conventional rolling-ball tilt switches are overly sensitive to small angle adjustments, causing them to switch between conducting and non-conducting states even with slight tilts, making them unsuitable for applications requiring a specific range of tilt angles.
Innovation Solution
A rolling-ball tilt switch design featuring a conductive housing, insulating seat, conductive terminal, and ball unit, where the inner surface of the housing defines specific angles to allow the ball unit to remain in a conducting position within a range of tilt angles, ensuring stability and preventing false triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conventional rolling-ball tilt switch uses a simple cylindrical roller cavity, then the structure is simple and easy to manufacture, but the switch is overly sensitive to small angle adjustments and cannot maintain a conducting state under a range of tilt angles
Solution Approach 1:
The roller cavity is segmented into multiple sections with different surface characteristics: a first section with a smaller inclination angle and a second section with a larger inclination angle. This segmentation allows the cavity to provide different functional zones - the first section maintains ball contact for small angle adjustments while the second section enables switching for larger angle changes, thus resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
Different sections of the roller cavity are given different local qualities through varying inclination angles. The first section has a gentler slope to maintain stability and prevent false triggering from minor tilts, while the second section has a steeper slope to ensure reliable switching when needed. This local differentiation enables the single cavity structure to achieve both tolerance and switching capability.
2Reliability
If the rolling-ball tilt switch uses a conventional design with uniform surface, then the manufacturing is simple, but the switch cannot remain in conducting state under designated range of tilt angles
Solution Approach 1:
The roller cavity incorporates dynamic geometric features with varying inclination angles rather than a uniform static surface. The first section's smaller angle dynamically accommodates small angle adjustments while maintaining ball contact, and the second section's larger angle dynamically enables switching. This dynamic geometric design improves reliability without requiring complex additional components, keeping manufacturing relatively simple.
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 allows the rolling-ball tilt switch to maintain a conducting state across a range of tilt angles, enhancing its operational tolerance and suitability for various applications by preventing false switching due to minor angle changes.
Implementation Method 1
The ball unit is disposed in the roller cavity, and is movable along the second surface portion between a conducting position, where the ball unit is concurrently in contact with the protruding section of the conductive terminal and the second surface portion, and a non-conducting position, where the ball unit is separated from the protruding section of the conductive terminal
Data Source
AI summary
A rolling-ball tilt switch includes a conductive housing having an inner surface that surrounds a longitudinal axis and that defines a roller cavity, an insulating seat inserted into the roller cavity, a conductive terminal having a protruding section extending through the insulating seat into the roller cavity, and a ball unit disposed in the roller cavity and moveable between a conducting position and a non-conducting position. The longitudinal axis and an extension of a surface portion of the inner surface of the conductive housing cooperatively define a first angle that ranges from 2 to 12 degrees.