Length-Measuring Device Mounting Element with Flexible Struts
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Solution Overview
Problem
Existing length-measuring devices face challenges in maintaining stable fixation of scales during temperature changes due to differing thermal expansion properties between the scale and support materials, which can lead to constraining forces and measurement inaccuracies.
Innovation Solution
The use of a mounting element with a first fastening portion attached to the scale and a second fastening portion attached to the support, featuring a plurality of flexible struts that allow perpendicular movement, compensating for flexure-induced changes in length to prevent movement in the longitudinal direction, ensuring stable fixation and thermal independence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the scale is directly fixed to the support at one point, then the scale is stationary in the measurement direction, but constraining forces are exerted on the scale during temperature changes due to different thermal expansion properties
Solution Approach 1:
A mounting element is introduced as an intermediary component between the scale and support. This mounting element includes a first fastening portion attached to the scale and a second fastening portion attached to the support, with flexible struts connecting them. The flexible struts act as a mediator that allows relative movement between scale and support during thermal expansion, preventing constraining forces while maintaining stationary fixation in the measurement direction.
2Measurement precision
If rigid fixation is used to ensure stable position, then measurement accuracy is maintained, but thermal expansion differences between scale and support cause measurement inaccuracies
Solution Approach 1:
The mounting element incorporates flexible struts that can dynamically adjust their length and configuration in response to thermal expansion. The struts are designed to be flexible in directions perpendicular to the measurement direction while maintaining rigidity in the measurement direction, allowing the system to adapt to temperature changes without compromising measurement precision.
3Strength
If the scale is fixed rigidly to the support, then structural stability is achieved, but the scale and support cannot expand independently during temperature changes
Solution Approach 1:
The connection between scale and support is segmented into multiple flexible struts rather than a single rigid connection. Each strut can independently deform and adjust, allowing the scale and support to expand independently while maintaining overall structural stability. The segmentation enables differential thermal expansion without compromising the integrity of the connection.
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
This solution provides a compact, accurate, and reliable position measurement system that prevents constraining forces during temperature changes, allowing the scale and support to expand independently while maintaining a stable reference point.
Implementation Method 1
An arrangement of a plurality of flexible struts is provided between the first fastening portion and the second fastening portion which, through flexure, allows the first fastening portion to move relative to the second fastening portion perpendicularly to the longitudinal direction
Implementation Method 2
The arrangement of struts is configured to compensate for a flexure-induced change in length of the struts in such a way that no movement will result from the flexure-induced change in length between the first fastening portion and the second fastening portion in the longitudinal direction
Implementation Method 3
The scale and the support are composed of materials having different thermal expansion properties. The stationary fixation has to be implemented in such a way that no constraining forces will be exerted by the support on the scale in response to temperature changes
Data Source
AI summary
A length-measuring device includes a scale and a mounting element. The mounting element has a first fastening portion by which the mounting element is stationarily attached to the scale and a second fastening portion configured to be stationarily attached to a support. An arrangement of a plurality of flexible struts is provided between the first fastening portion and the second fastening portion which, through flexure, allows the first fastening portion to move relative to the second fastening portion perpendicularly to the longitudinal direction. The arrangement of struts is configured to compensate for a flexure-induced change in length of the struts in such a way that no movement will result from the flexure-induced change in length between the first fastening portion and the second fastening portion in the longitudinal direction.