Pull-out Tester Elastic Element for Consistent Force
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Solution Overview
Problem
Existing pull-out testers for setting bolts in concrete ceilings face challenges in maintaining a consistent pull-out test force across varying temperatures and speeds, leading to incorrect identification of setting failures due to thermal influences and deformation of plastic catches.
Innovation Solution
A pull-out tester with an elastic element, made from materials with a temperature-independent spring constant, that undergoes elastic deformation to detach from the setting bolt when a pre-defined force is exceeded, ensuring a constant pull-out test force regardless of temperature and speed, and a setting tool with a mechanism to accurately assess the tensile capacity of setting bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If plastic catches are used for pull-out testing, then the testing mechanism is simple, but the pull-out test force varies significantly with temperature and speed
Solution Approach 1:
The patent changes the material parameter from plastic to metal for the elastic element, fundamentally altering the deformation characteristics. Metal exhibits linear elastic deformation with a constant spring constant that is independent of temperature and deformation speed, thereby ensuring consistent pull-out test force across different environmental conditions and testing rates.
Solution Approach 2:
The patent replaces the plastic deformation-based testing mechanism with a metal elastic deformation-based mechanism. This substitution transitions from a system where plastic catches deform permanently to one where metal springs deform elastically and consistently, providing reliable and repeatable pull-out force measurements.
2Measurement precision
If greater pull-out test forces are applied to ensure sufficient testing, then setting bolts with sufficient capacity are correctly identified, but more setting bolts are incorrectly pulled out and classified as failures
Solution Approach 1:
The patent changes the elastic element's material properties from plastic to metal, which has a higher elastic limit and a constant spring constant. This allows the use of a standardized, consistent pull-out test force that accurately distinguishes between setting bolts with sufficient capacity and those with insufficient capacity, preventing both false positives and false negatives in the testing process.
3Reliability
If the pull-out test force is reduced to avoid pulling out sound setting bolts, then fewer setting bolts are removed, but the ability to detect concealed setting failures is compromised
Solution Approach 1:
The patent changes the elastic element from plastic to metal, enabling the use of a consistent and reliable pull-out test force that is high enough to detect concealed setting failures but controlled enough to avoid removing sound setting bolts. The metal spring's constant spring constant ensures that the test force remains stable and predictable throughout the testing process.
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 ensures that only setting bolts with insufficient tensile force are removed, while those with sufficient capacity remain in place, improving the reliability of fastening systems by maintaining a consistent pull-out test force across different conditions.
Implementation Method 1
with the exceeding of a pull-out test force acting on the setting bolt due to a deformation of the elastic element, the connection between the setting bolt and the pull-out tester is detached, wherein the force for the deformation of the elastic element, transmitted onto the elastic element, essentially causes an elastic deformation of the elastic element
Data Source
AI summary
The invention relates to a pull-out tester (1) for a setting tool used for setting a setting bolt (3), comprising a retaining part (4) for holding the setting bolt (3), an elastic element (7), at least one means (9) for transmitting a pull-out force acting on the setting bolt (3) onto the elastic element (7) such that if a pull-out testing force acting on the setting bolt (3) is exceeded, the connection between the setting bolt (3) and the pull-out tester (1) can be detached due to a deformation of the elastic element (7). The problem addressed by the invention is that of being able to provide a substantially constant pull-out testing force, even in different temperatures and with a different pull-out speed of the pull-out tester (1). The problem is solved in that the force transmitted to the elastic element (7) in order to deform the elastic element (7) substantially causes an elastic deformation of the elastic element (7) and the connection between the setting bolt (3) and the pull-out tester (1) can be detached due to the substantially elastic deformation of the elastic element (7).