Extendable Level Braking and Bushing Design for Coplanarity
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Solution Overview
Problem
Conventional extendable levels face challenges in maintaining coplanarity of working surfaces while providing a robust and easy-to-use design with effective locking and braking mechanisms, which affects their usability and accuracy in leveling applications.
Innovation Solution
The design incorporates a braking mechanism with adjustable friction and bushings that exert forces between the frame and extension, allowing for smooth and stable length adjustment, along with a dovetail fit and spring-loaded bushings to maintain contact and control movement, and a color-contrasting vial arrangement for improved readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a braking mechanism is added to control extension movement, then the levelness indication accuracy is improved, but the device complexity increases
Solution Approach 1:
The braking mechanism is integrated into the extension structure itself, where the brake surface is formed as part of the extension body that engages with the frame. This merging of functions allows the braking mechanism to control extension movement and maintain levelness indication accuracy without adding separate complex components, thereby resolving the contradiction between measurement precision and device complexity.
2Reliability
If bushings with springs are used to maintain contact between frame and extension, then the reliability of coplanarity is improved, but the device complexity increases
Solution Approach 1:
The bushings with springs are designed to automatically maintain contact between the frame and extension through elastic deformation. The springs self-adjust to ensure continuous contact and coplanarity without requiring external adjustment mechanisms or complex control systems, thereby improving reliability while minimizing the increase in device complexity.
3Ease of operation
If the extension is made fully slidable for easy adjustment, then the ease of operation is improved, but the stability of the extended configuration deteriorates
Solution Approach 1:
The system transitions from a static fixed-length level to a dynamic adjustable-length level with a braking mechanism. The brake allows the extension to be freely adjusted when needed (improving ease of operation) while providing a stable locked configuration when the desired length is reached (maintaining configuration stability). The dynamic control of friction enables both states to be achieved sequentially.
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
This configuration enables the level to maintain coplanarity and adjustability, providing a robust and user-friendly extendable body with precise leveling capabilities, ensuring accurate measurements across various configurations.
Implementation Method 1
The level comprises one or more bushings that comprise a spring exerting a force between the frame and the extension
Implementation Method 2
The level comprises a braking mechanism that frictionally resists movement between the frame and the extension
Data Source
AI summary
An extendible or adjustable length level is provided. The level includes a frame, a slidable member, and a bushing. The slidable member is coupled to the frame and extends and retracts along the frame. The bushing is coupled to one of the frame or the slidable member and couples the frame and slidable member together.