Measuring Tape Blade Cupping for Longer Standout Without Twisting

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional measuring tapes have limited standout length due to bending and collapse, necessitating repeated attempts to reach anchor points rather than moving to attach the end hook, which is inefficient and limits user experience.

Innovation Solution

Increasing cupping of the blade portion of the measuring tape through shot peening, specifically using a dual nozzle assembly to apply a bead blast area centered along the longitudinal centerline, enhancing curvature without causing blade twisting, and maintaining rigidity for extended standout.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the measuring tape blade is made stiffer to maintain rigidity during extension, then the standout length is improved, but the ability to wind onto the reel assembly deteriorates

Engineering Contradiction:

Improvestandout lengthVSAvoidwinding capability

Core Design Contradiction:

Length of moving objectVSEase of manufacture

Solution Approach 1:

The blade is given a curved or cupped cross-sectional shape along its length. This curvature allows the blade to bend and wind onto the reel assembly while maintaining sufficient rigidity in the longitudinal direction to achieve extended standout lengths without collapsing.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The cupping parameter of the blade is modified by applying compressive forces to the convex side surface, changing the mechanical properties of the blade material. This creates residual compressive stresses that enhance the blade's ability to maintain rigidity while still allowing it to flex for winding.

Inventive Principle:

Principle #35Parameter changes

2Strength

If the cupping of the blade is increased to enhance standout, then the rigidity is improved, but the blade may twist during extension

Engineering Contradiction:

Improveblade rigidityVSAvoidblade orientation

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The compressive forces are applied locally to specific regions of the convex side surface of the blade, creating localized zones of increased cupping. This allows differential modification of blade properties along its length, enhancing rigidity where needed while maintaining orientation stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The blade exhibits asymmetric cupping with different curvature characteristics along its length, with greater cupping in regions that require enhanced rigidity for standout while maintaining overall directional stability during extension.

Inventive Principle:

Principle #4Asymmetry

3Length of moving object

If the measuring tape is made longer to increase standout distance, then the measurement range is improved, but the reliability of reaching anchor points deteriorates due to blade collapse

Engineering Contradiction:

Improvemeasuring rangeVSAvoidstandout reliability

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The curved cross-section of the blade provides structural strength that prevents collapse even at extended lengths, allowing the measuring tape to reliably reach distant anchor points without the blade bending under its own weight.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

By modifying the cupping parameter through controlled application of compressive forces, the blade achieves optimal rigidity-to-flexibility ratio that maintains reliability for reaching anchor points at extended distances while still allowing winding operation.

Inventive Principle:

Principle #35Parameter changes

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 increased cupping allows for a longer standout distance without collapsing, reducing the need for frequent repositioning and improving user experience by maintaining blade rigidity and preventing twisting during extension.

Implementation Method 1

a shot peening assembly for cupping a measuring tape blade is provided. The assembly may include a first nozzle operably coupled to a high pressure air line and a shot line to enable shot entering a pressurized air stream from the high pressure air line to be propelled against a first portion of a convex side of the blade via the first nozzle

Methodology Applied

Scientific EffectShot peening: Shot Peening

Implementation Method 2

a first nozzle operably coupled to a high pressure air line and a shot line to enable shot entering a pressurized air stream from the high pressure air line to be propelled against a first portion of a convex side of the blade

Methodology Applied

Scientific EffectHigh pressure air stream: Pressure Gradient

Data Source

PatentUS11293738B2Method and apparatus for providing a measuring tape with increased cupping

Publication Date: 2022.04.05 APEX BRANDS INC

AI summary

A method of producing a measuring tape may include providing a cupped blade with substantially uniform cupping over a longitudinal length of the cupped blade, applying a stress relief operation to a selected portion of only a convex side of the cupped blade to increase curvature of the cupped blade in the selected portion of the cupped blade where the stress relief operation includes bead blasting the selected portion via a dual nozzle shot peening assembly to define a combined bead blast area that is substantially centered with respect to a longitudinal centerline of the blade, and operably coupling the cupped blade to a reel assembly and providing the cupped blade and reel assembly within a housing to define the measuring tape device.