Portable Shear Tester Leverage Digital Load Cell
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Solution Overview
Problem
Current portable shear testing devices are difficult to use for applications like confirming adhesion of tile panels due to reliance on pneumatic pressure sensors requiring cross-reference sheets and have multiple moving parts with high internal friction, leading to reduced accuracy.
Innovation Solution
A portable shear testing device with a shear force unit featuring pivotally mounted lever and digital load cell, and a drill guide with a drill bit for creating circular grooves, allowing precise measurement of shear force with reduced friction and no need for cross-reference sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pneumatic pressure sensors are used in portable shear testing devices, then the device can be made portable, but the device requires cross-reference sheets to interpret readings and has multiple moving parts with high internal friction
Solution Approach 1:
The patent removes the pneumatic pressure sensor system entirely and replaces it with a direct mechanical load cell measurement system. This extraction eliminates the need for cross-reference sheets and reduces internal friction by removing multiple moving parts, while maintaining portability through the simplified mechanical design.
Solution Approach 2:
The patent replaces the pneumatic pressure sensing system with a mechanical load cell system that directly measures shear force. This substitution eliminates the need for pneumatic components, cross-reference interpretation, and reduces internal friction, thereby improving measurement accuracy while maintaining portability.
2Adaptability or versatility
If multiple moving parts are used in portable shear testing devices, then the device can achieve complex motion, but internal friction increases and measurement accuracy decreases
Solution Approach 1:
The patent extracts and removes unnecessary moving parts from the system, retaining only the essential pivotally mounted lever needed for force application. This reduction in moving parts directly decreases internal friction and improves measurement accuracy while maintaining the necessary motion capability for shear testing.
Solution Approach 2:
The patent concentrates the motion capability in a single, well-defined pivot point rather than distributing it across multiple moving parts. This localization of motion reduces internal friction at each interface while maintaining the overall adaptability and versatility needed for various shear testing configurations.
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 device provides accurate and user-friendly shear force measurements with improved portability and reduced internal friction, enhancing measurement precision and ease of use.
Implementation Method 1
a digital load cell positioned between the lever and the load transfer block
Implementation Method 2
one of the jaw members is moved by a pivotally mounted lever that laterally moves a load transfer block connected to the jaw member
Implementation Method 3
a threaded knob is rotated to press against the lever
Implementation Method 4
a drill shaft with a drill bit that is configured to cut a circular groove
Implementation Method 5
a drill shaft with a drill bit that is configured to cut a circular groove
Data Source
AI summary
A portable shear testing device includes a shear force unit that has two elongated jaw members that are positioned adjacent to each other. One of the jaw members can be moved away from the other, stationary jaw member. One of the jaw members is moved by a pivotally mounted lever that laterally moves a load transfer block connected to the jaw member. A digital load cell is positioned between the lever and the load transfer block and a threaded knob is rotated to press against the lever.