Movable Housing Screw Load Testing Device
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Solution Overview
Problem
Existing screw load testing devices are limited in their ability to perform destructive load tests on breakaway screws, as the housing members block the space needed for specialized tools to remove the screw fragments after the test.
Innovation Solution
A screw load testing device with movable housing members that can be shifted from a first position with a smaller axial distance to a second position with a larger axial distance, allowing for easy removal of the screw after the test without the need for additional tool engagement surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the housing members are clamped against one another by the axial force during destructive load test of a breakaway screw, then the screw connection is securely held for testing, but the space for applying specialized tools is blocked making it impossible to remove screw fragments
Solution Approach 1:
The housing members are designed to be movable relative to each other along the longitudinal axis. After the breakaway screw test is completed and the rear screw head breaks off, the housing members can be shifted apart axially to create clearance. This dynamic adjustment allows the clamping force to be maintained during testing while enabling tool access afterward for removing screw fragments from the threaded portion.
2Ease of operation
If additional tool engagement surfaces are attached to the breakaway screw, then specialized tools can be applied for removing screw fragments, but mechanical processing alters the screw's strength properties and falsifies measurement results
Solution Approach 1:
The housing members are pre-configured with internal threaded portions that can receive and hold the breakaway screw before testing. After the rear screw head breaks off during the load test, the housing members can be shifted apart to provide access to the threaded portion for removing fragments using standard tools. This eliminates the need for preliminary attachment of additional tool engagement surfaces to the screw itself, thereby preserving the screw's original strength properties and ensuring accurate measurement results.
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
Enables easy removal of screw fragments from the testing device after a destructive load test, preventing mechanical processing that could alter the screw's strength properties and ensuring accurate measurement results.
Implementation Method 1
a clamping device (24) is provided for moving the two housing members (14, 62) from a first position to at least a second position
Implementation Method 2
said resetting means being formed as at least one spring element (45) arranged in the area of the clamping device (24) between two members (26, 28) of the clamping device (24) configured to be movable relative to one another in the direction of the longitudinal axis (22)
Data Source
AI summary
The invention relates to a screw load testing device that includes a housing configured to support a screw and a mating element that is formed as a threaded nut and is positioned to interact with a threaded portion of the screw. The screw load testing device housing includes a measuring device for detecting an axial force acting on the screw and/or for detecting a torque acting on the screw. A first housing member is configured to interact at least indirectly with a portion that is in monolithic connection to the screw. A second housing member is configured to interact with the threaded nut, and the two housing members are arranged movably relative to each other at least in the direction of a longitudinal axis.