Slidable Ruler with Wheel Hand Stand for Straight Writing
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Solution Overview
Problem
Conventional rulers fail to prevent hand staining and ensure straight-line writing, especially when writing large letters, as ink adheres to the hand and it is difficult to maintain a horizontal line without additional tools.
Innovation Solution
A ruler with two slidable parts, featuring a rectangular body with longitudinal recesses, a hand stand with rotating wheels for horizontal movement, and a wrist stand with a curved surface and hemispherical ground portions for wrist support, allowing for controlled hand and wrist movement to prevent hand staining and ensure straight-line writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional ruler is used for writing large letters, then the ruler can provide a straight edge reference, but the hand becomes stained with ink and it is difficult to maintain a horizontal line
Solution Approach 1:
The patent introduces intermediary components (hand stand with wheels and wrist stand with ground portions) that mediate between the user's hand and the writing surface. These intermediaries allow the hand to move along predefined tracks without direct contact with the paper, preventing ink staining while maintaining writing precision
Solution Approach 2:
The ruler is segmented into multiple functional components: a fixed ruler body providing the straight edge reference, a slidable hand stand with wheels for horizontal movement, and a wrist stand with ground portions for vertical movement. This segmentation allows independent control of hand position and writing angle
2Object-affected harmful factors
If the hand is held stationary to prevent staining, then hand cleanliness is improved, but the ability to move along the writing line is restricted
Solution Approach 1:
The hand stand is designed with wheels that enable dynamic horizontal movement along the first recess, while the wrist stand with ground portions allows dynamic vertical adjustment. This dynamic design maintains hand cleanliness by preventing direct paper contact while preserving necessary movement freedom for writing large letters
3Manufacturing precision
If a fixed ruler position is used to ensure straight line writing, then writing precision is improved, but the ability to adjust to different writing positions is reduced
Solution Approach 1:
The slidable hand stand with wheels provides dynamic horizontal positioning along the ruler's length, while the wrist stand with ground portions offers vertical adjustment. This allows the writing surface to remain fixed for precision while the hand position adapts to different writing requirements
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 enables hands to remain clean and facilitates writing large letters in a straight line by allowing controlled movement of the hand and wrist, reducing ink adherence and improving writing precision.
Implementation Method 1
a hand stand having a wheel, which is coupled with the second recess of the ruler body
Implementation Method 2
ground portions attached to the support portion, wherein the ground portions are grounded to the bottom of the first recess
Data Source
AI summary
A ruler having two slidable parts includes a ruler body, which is formed in rectangular shaped, the ruler body having a first recess extending longitudinally on its top surface and a second recess extending longitudinally on its side surface, a hand stand having a wheel, which is coupled with the second recess of the ruler body, and a wrist stand, the wrist stand having a wrist rest portion, a support portion for supporting the wrist rest portion, a joint connecting the wrist rest portion and the support portion, and ground portions attached to the support portion, wherein the ground portions are grounded to the bottom of the first recess.