Rolling-ball tilt switch inner surface geometry for stable contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rolling-ball tilt switches are susceptible to small angle adjustments and cannot maintain a conducting state within a designated range of tilt angles, leading to unreliable operation.
Innovation Solution
The design includes a conductive housing with a specific inner surface geometry that defines a first angle between 5 to 55 degrees, allowing the conductive rolling-ball to remain in contact with the conductive terminal over a range of tilt angles, ensuring the switch remains in a conducting state within a designated tilt range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional rolling-ball tilt switch uses a simple reception space with cylindrical inner surface, then the structure is simple and easy to manufacture, but the switch cannot maintain conducting state within a range of tilt angles and is susceptible to small angle adjustments
Solution Approach 1:
The inner surface of the reception space is designed with different geometric characteristics in different regions: the first region has a cylindrical surface, the second region has a tapered surface diverging from the central axis, and the third region has a tapered surface converging toward the central axis. This local variation in geometric properties allows the rolling ball to maintain contact with the conductive terminal over a range of tilt angles while keeping the overall structure relatively simple.
Solution Approach 2:
The dynamic response of the rolling ball to tilt angle changes is optimized through the specific geometric design. The diverging and converging tapered surfaces create a controlled dynamic environment that allows the ball to remain in contact with the terminal during small angle adjustments, maintaining the conducting state dynamically across a range of positions.
2Adaptability or versatility
If the inner surface of the reception space has a large divergence angle, then the rolling ball can maintain contact over a larger tilt angle range, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the angle between the extension of the second surface portion and the longitudinal axis ranges from 5 to 55 degrees. This parameter optimization balances the need for a sufficient tilt angle range with manufacturing feasibility, avoiding excessively large angles that would require ultra-precise manufacturing while still providing adequate adaptability.
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 solution effectively maintains the rolling-ball tilt switch in a conducting state over a specified range of tilt angles, enhancing its reliability and usability by preventing unintended switching due to minor angle changes.
Implementation Method 1
When the conventional rolling-ball tilt switch 9 is tilted, as long as any one of the two rolling-balls 92 are concurrently in contact with the conductive shell 91 and the conductive terminal 94, the conventional rolling-ball tilt switch 9 is in a conducting state
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 conductive rolling-ball disposed in the roller cavity and movable 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 an angle ranging from 5 to 55 degrees.