Resilient Thumb Engaging Portion for Tape Rule Impact Absorption
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Solution Overview
Problem
Retractable tape rule assemblies face challenges in durability, particularly with the thumb engaging portion, which is prone to impact damage and wear, affecting the overall utility and longevity of the tool.
Innovation Solution
A retractable tape rule assembly with a resilient thumb engaging portion made of elastomeric material, a coil spring mechanism for blade winding, and a protective clear plastic coating on the blade with fluorescent additive for improved readability, combined with a blade holding assembly that absorbs impact and provides secure blade engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid thumb engaging portion is used in the blade holding assembly, then structural strength is maintained, but impact resistance and durability deteriorate due to prone to impact damage
Solution Approach 1:
The patent applies parameter changes by transitioning the thumb engaging portion from a rigid material to a resilient elastomeric material. This material parameter change enables the component to deform under impact forces and return to its original shape, simultaneously maintaining structural integrity and improving impact resistance. The elastomeric material's elastic properties allow it to absorb impact energy while preserving the structural strength needed for blade engagement.
Solution Approach 2:
The patent employs composite materials by integrating an elastomeric thumb engaging portion with a rigid blade engaging portion in the blade holding assembly. This composite structure combines the advantages of both materials: the elastomeric portion provides impact resistance and durability, while the rigid portion maintains structural strength for secure blade engagement. The composite design resolves the contradiction between strength and impact resistance by distributing different functional requirements to different material components.
2Object-affected harmful factors
If standard blade coating is applied, then basic protection is provided, but readability in dimly lit conditions deteriorates
Solution Approach 1:
The patent applies color changes by incorporating fluorescent additive into the clear plastic coating on the blade. The fluorescent material absorbs light during the day and re-emits it with enhanced brightness in low-light conditions, thereby improving readability without compromising the protective function of the coating. This principle allows the blade to maintain its protective coating while significantly enhancing visibility in dimly lit environments.
Solution Approach 2:
The patent uses an intermediary substance (fluorescent additive) within the blade coating to bridge the gap between protection and readability. The fluorescent additive acts as a mediator that converts ambient light into enhanced visibility, allowing the blade to simultaneously achieve protective coating coverage and improved illumination characteristics for better readability in low-light conditions.
3Device complexity
If the blade holding assembly is simplified, then device complexity is reduced, but impact absorption capability deteriorates
Solution Approach 1:
The patent applies flexible shells by using an elastomeric thumb engaging portion that functions as a flexible protective element. This elastomeric component forms a resilient shell around the thumb engagement area, providing impact absorption capability while maintaining a relatively simple overall assembly structure. The flexible nature of this shell allows it to deform and absorb impact forces without adding significant structural complexity to the blade holding assembly.
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
Enhances the durability and readability of the tape rule by absorbing impact, maintaining structural integrity, and providing clear, long-lasting measurements even in dimly lit conditions through the use of a resilient thumb engaging portion and a protective coating on the blade.
Implementation Method 1
a coil spring formed of a ribbon of metal is constructed to rotate the reel in the housing assembly in a direction to wind up the elongated blade
Implementation Method 2
a resilient thumb engaging portion and a receiving region behind the thumb engaging portion to enable the thumb engaging portion to deform into the receiving region to absorb impact
Implementation Method 3
a protective clear plastic coating on the blade with fluorescent additive for improved readability
Data Source
AI summary
One aspect of an invention disclosed herein relates to improved durability of the thumb engaging portion of a tape rule locking assembly. In accordance with this aspect, there is provided a retractable rule assembly comprising a housing assembly; a reel rotatably mounted in the housing assembly; and an elongated blade formed of a ribbon of metal being wound on the reel. The elongated blade has measuring indicia formed on a concave side thereof; and a coil spring formed of a ribbon of metal is constructed to rotate the reel in the housing assembly in a direction to wind up the elongated blade. A blade holding assembly for holding the blade in a position of extension outwardly of said housing, said blade holding assembly comprising a resilient thumb engaging portion and a receiving region behind the thumb engaging portion to enable the thumb engaging portion to deform into the receiving region to absorb impact.