Tape Measure Core Bearings for Smooth, Low-Noise Retraction
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Solution Overview
Problem
Existing tape measures suffer from excessive shaking and noise during rotation due to improper processing or installation of internal ribbing, leading to a suboptimal user experience.
Innovation Solution
A tape measure design featuring bearings on the core shaft, including an aluminum core shaft with first bearings on the tape measure core, upper and bottom brake blocks, and a cleaning mechanism with a carrier plate and rotating disk, ensuring smooth operation and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If internal ribbing is used to rotate the tape measure core, then the structure is simple and cost-effective, but the core shakes excessively and produces noise during rotation
Solution Approach 1:
The patent introduces bearings as an intermediary component between the core shaft and the housing ribbing. The bearings mediate the rotational interaction, allowing the simple ribbing structure to rotate the core smoothly without excessive shaking or noise, thus resolving the contradiction between structural simplicity and rotational stability.
2Ease of manufacture
If internal ribbing is used to rotate the tape measure core, then manufacturing cost is low, but noise is generated during operation
Solution Approach 1:
The bearings serve as a noise-reducing intermediary that sits between the ribbing-driven rotation system and the core shaft. This allows the inexpensive ribbing structure to function while the bearings dampen the noise and vibration, maintaining low manufacturing cost while eliminating the harmful noise effect.
3Stability of the object's composition
If bearings are added to the core shaft, then rotation smoothness and noise reduction are achieved, but device complexity increases
Solution Approach 1:
The patent segments the rotation system into distinct functional components: the ribbing structure for driving rotation, the bearings for smooth rotation and noise reduction, and the core shaft for tape winding. This segmentation allows each component to be optimized independently while maintaining overall system simplicity through modular assembly.
4Stability of the object's composition
If multiple components are added to improve rotation, then rotation performance is enhanced, but manufacturing cost increases
Solution Approach 1:
The patent uses standard, inexpensive bearing components that are mass-produced and readily available. These affordable bearings provide significant rotation performance improvement without substantially increasing manufacturing cost, as they are simple, standardized parts that can be easily integrated into the existing ribbing-driven rotation system.
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 design provides smoother tape extension and retraction, reduces noise, and lowers overall cost by minimizing unnecessary part rotation, while allowing for easy cleaning of the tape.
Implementation Method 1
both sides of the tape measure core inner wall are inserted with first bearings, an inner wall of the first bearings is sleeved on an outside of the tape measure core
Data Source
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AI summary
A tape measure with bearings on the core shaft of the tape measure includes a first tape measure housing and a second tape measure housing, inner wall of first tape measure housing and inner wall of second tape measure housing are snap-fitted in opposite directions, centers of inner walls of first tape measure housing and second tape measure housing are inserted with an aluminium core shaft, outside center of aluminium core shaft is sleeved with a tape measure core, both sides of tape measure core inner wall are inserted with first bearings, an inner wall of first bearings is sleeved on outside of the tape measure core, outside of first tape measure housing and second tape measure housing is jointly movably mounted with an upper brake block, bottom side of first tape measure housing and second tape measure housing inner wall is jointly provided with a bottom brake block.