Tape Measure Core Shaft Bearings for Smooth, Low-Noise Retraction
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Solution Overview
Problem
Existing tape measures with internal ribbing in the housing often shake excessively during rotation due to improper processing or installation, leading to a rough and noisy operation.
Innovation Solution
A tape measure with bearings on the core shaft, featuring a first and second tape measure housing with a snap-fitted inner wall, an aluminum core shaft, and bearings on the tape measure core, along with a brake block and cleaning mechanism to enhance smooth operation and reduce 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, but the core shakes excessively during rotation
Solution Approach 1:
The patent introduces an aluminum core shaft as an intermediary component between the housing and the tape measure core. This shaft provides a stable rotational axis with bearings, mediating the rotation function while eliminating the shaking problem caused by direct ribbing engagement. The shaft acts as a mediator that separates the rotational function from the housing structure.
2Ease of operation
If bearings are added to the core shaft, then rotation smoothness improves, but device complexity increases
Solution Approach 1:
The aluminum core shaft serves multiple functions: it provides structural support, defines the rotational axis, houses the bearings, and connects the housing to the tape measure core. By making the shaft multi-functional, the patent achieves smooth rotation with bearings while minimizing the increase in overall device complexity.
3Ease of manufacture
If traditional housing structure is used, then manufacturing is simple, but cleaning access is difficult
Solution Approach 1:
The housing is segmented into first and second housing parts that can be separated from each other. This segmentation allows the housing to be manufactured using simple injection molding processes while enabling easy access to the interior for cleaning and maintenance. The separated housing parts can be removed to access the aluminum core shaft and bearings.
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 bearings on the core shaft ensure smoother tape extension and retraction with reduced noise, while the cleaning mechanism maintains the tape's clarity, and the overall cost is lower compared to prior art.
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
AI summary
A tape measure with bearings on the core shaft of the tape measure, comprising 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.