Pivot Switch Feel Measurement Setup
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Solution Overview
Problem
Conventional methods for measuring the feel of pivot switches are inaccurate and unreliable due to the use of linear measurements for devices that move in an arc, leading to errors in torque/angular displacement profiles, and lack a quantitative, objective, and repeatable means to define and verify switch feel characteristics.
Innovation Solution
A method that involves aligning the switch axis with the measurement axis in both the normal and parallel directions, using a switch feel measuring system that includes a control unit, force/torque sensor, and stepper motor to accurately measure torque/angular displacement profiles, and automates the alignment process to minimize errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If linear measurements are used for pivot switches, then the measurement process is simple, but measurement accuracy deteriorates because pivot switches move in an arc not a straight line
Solution Approach 1:
The patent applies curvature by using an arc-shaped measurement path that matches the pivot switch's natural arc movement. The measurement unit is positioned and oriented to follow the curved trajectory of the switch actuator, transforming the linear measurement approach into a curved one that accurately captures the pivot switch's motion characteristics without requiring complex alignment procedures.
2Productivity
If rough visual alignment is used between measurement axis and switch axis, then setup time is reduced, but measurement reliability deteriorates due to inconsistent and inaccurate results
Solution Approach 1:
The patent implements self-alignment through a fixture design that automatically positions the measurement unit's axis collinear with the pivot switch's axis of rotation. The fixture incorporates geometric features such as aligned holes and mounting surfaces that guide the measurement unit into the correct position without requiring manual adjustment or visual alignment by the operator, thereby achieving both speed and reliability.
3Measurement precision
If advanced measurement devices with force/displacement profiling are used, then switch feel definition becomes more complete, but device complexity and measurement error increase due to misalignment issues
Solution Approach 1:
The patent introduces a specialized fixture as an intermediary between the pivot switch and the measurement unit. This fixture serves as a mediator that mechanically enforces proper alignment between the measurement axis and the switch axis, eliminating the need for complex alignment procedures while allowing the use of advanced force/displacement measurement devices to capture complete switch feel characteristics.
Data Source
AI summary
A method may be employed to assure that a switch feel measurement system accurately measures a torque/angular displacement profile for a pivot switch. A procedure may be employed that aligns the pivot axis of the switch with the rotational axis of the measurement unit of the switch measurement system.