Linear Guide Micro-Profile Prevents Self-Locking in Pipe Measuring Devices
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Solution Overview
Problem
Measuring devices for pipe sections often experience self-locking issues due to material property changes over their service life, affecting measurement accuracy, and existing solutions fail to prevent self-locking effectively.
Innovation Solution
A measuring device with a linear guide featuring a guide channel and a movable guide element with a micro-profile on its outer wall, comprising protrusions and indentations oriented at a right angle, which counteracts self-locking by maintaining a smaller width/length ratio, preventing the guide element from becoming forcibly locked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measuring stamps are arranged in a measuring arm with a linear guide, then length measurement capability is provided, but self-locking occurs rapidly due to material property changes
Solution Approach 1:
The outer wall of the guide element is provided with local structural features (protrusions and/or indentations) that create a micro-profile with specific width/length ratios. These localized geometric modifications prevent self-locking by ensuring that at least one direction of movement has a width/length ratio below the self-locking threshold, while maintaining the overall guide structure's ability to provide precise linear guidance for length measurement.
2Reliability
If the guide element has a small width/length ratio to prevent self-locking, then self-locking is prevented, but the guide length must be increased which affects device compactness
Solution Approach 1:
Instead of increasing the guide length in the primary movement direction, the solution introduces a secondary dimension by adding protrusions and/or indentations to the outer wall. This creates additional movement directions with favorable width/length ratios, allowing self-locking prevention without extending the main guide length, thus maintaining device compactness while ensuring reliable operation.
Data Source
AI summary
The invention relates to a measuring device for precisely determining the length of at least one longitudinal profile between two measuring arms opposite of one another, with said two measuring arms opposite of one another and a measuring stamp, which can be moved in one of the measuring arms by means of a linear guide. The longitudinal profile can be positioned such that one end abuts against the measuring stamp. The linear guide comprises a guide channel extending in a guiding direction and a guide element having an outer wall, which guide element can be moved back and forth in the guide channel along the guiding direction. The guide element comprises a first guide length and a first guide width and forms a first width/length ratio. On the outer wall, in a cross-section that is vertical to the guiding direction, indentations and/or protrusions are provided circumferentially in the guide section direction, each having an additional guide length, an additional guide width and an additional width/length ratio, wherein the additional width/length ratios are smaller than the first width/length ratio.