Measuring Tape Lock Button Guard Design

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Solution Overview

Problem

Measuring tape lock buttons are vulnerable to impact damage, which compromises their ergonomics and mechanical advantage due to low-profile designs intended for protection.

Innovation Solution

A guard assembly with guard members extending on opposing lateral sides of the locking assembly protects the lock button from impact, enhancing ergonomics and mechanical advantage without sacrificing durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the lock button is designed with a low profile to protect from impact damage, then the vulnerability to impact damage is reduced, but the ergonomics and mechanical advantage during button actuation are negatively impacted

Engineering Contradiction:

Improvevulnerability to impact damageVSAvoidergonomics and mechanical advantage

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The lock button assembly is segmented into two distinct functional parts: a low-profile locking mechanism (for protection) and a separate guard member (for ergonomics). The guard member extends laterally from the housing to provide a larger actuation surface, while the locking mechanism itself remains compact and protected, resolving the contradiction between protection and ease of operation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guard member acts as an intermediary element between the user's finger and the locking mechanism. It provides a larger mechanical advantage for actuation while the locking mechanism itself remains low-profile and protected. The guard member mediates the force application, allowing easier operation without compromising the protective low-profile design of the core locking mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the lock button extends outwardly from the housing to provide better ergonomics, then the mechanical advantage during button actuation is improved, but the lock button becomes vulnerable to damage if the measuring tape is dropped or encounters impact

Engineering Contradiction:

Improvemechanical advantageVSAvoidvulnerability to impact damage

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The lock button assembly is divided into the locking mechanism (kept low-profile for protection) and a separate guard member (extended for ergonomics). This segmentation allows the ergonomic benefits of an extended actuation surface while the core locking mechanism remains protected and low-profile.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the lock button assembly have different profiles and functions. The guard member has a larger lateral extension for ergonomic actuation, while the locking mechanism itself maintains a low profile for protection. This local differentiation of quality resolves the contradiction between ergonomics and protection.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11385038B2Measuring tape with lock button guard

Publication Date: 2022.07.12 APEX BRANDS INC

AI summary

A measuring tape device may include a housing having an aperture, a reel assembly defining an axis, a blade having a first end configured to extend from the housing through the aperture and a second end configured to be wound on the reel assembly, a locking assembly configured to alternately allow and prevent winding of the blade onto the reel assembly based on a position of the locking assembly, and a guard assembly comprising guard members extending on opposing lateral sides of the locking assembly to protect the locking assembly from impact.