Sliding Scale Ruler with Detent Positions for Fractional and Decimal Measurement
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Solution Overview
Problem
Conventional rulers lack precision in measuring fractional and decimal portions of an inch, and they do not provide easy-to-read measurements for users.
Innovation Solution
A ruler with a sliding scale that includes detent positions at one-inch intervals, featuring scale indicia for both fractional and decimal portions of an inch, and optionally using different colors for indicia to enhance readability, with both the base and sliding scale being transparent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional rulers use a single scale type, then the device complexity is low, but the measurement precision for both fractional and decimal portions is insufficient
Solution Approach 1:
The ruler is divided into a stationary base portion and a movable scale portion that can slide relative to each other. The movable scale contains both fractional and decimal markings, allowing precise measurement of either system by positioning the scale at appropriate detent locations along the base.
Solution Approach 2:
The movable scale integrates both fractional and decimal measurement systems into a single component, enabling the ruler to perform multiple measurement functions. The scale can be positioned at different detent locations to measure using either fractional or decimal portions of an inch.
2Measurement precision
If the ruler uses detailed scale markings for both fractional and decimal portions, then the measurement precision improves, but the ease of operation and readability deteriorates due to visual confusion
Solution Approach 1:
Different portions of the scale have different visual characteristics to indicate their measurement system. Fractional markings may use one style or color while decimal markings use another, allowing users to quickly identify and read the appropriate scale without confusion.
Solution Approach 2:
The movable scale can be dynamically positioned by the user to align with different detent locations on the base. This dynamic positioning allows the user to select which measurement system (fractional or decimal) is active and visible, making the appropriate scale easily readable while hiding or minimizing the other.
3Illumination intensity
If the ruler components are transparent, then the visibility and readability of scale markings improve, but the manufacturing complexity increases
Solution Approach 1:
The transparent base and scale portions incorporate color-coded markings and potentially colored transparent materials to enhance the visibility of scale indicators. Different colors may be used for fractional versus decimal markings, or for different measurement ranges, improving readability against the transparent background.
Data Source
AI summary
A ruler includes an elongated base having a longitudinal axis, a first outer edge, and an opposite second outer edge. A scale is received by the base and is slidably positionable along the longitudinal axis to a plurality of detent positions. The scale includes indicia depicting both fractional and decimal portions of one inch.