Tape Measure Bumper Reducing Hook Impact Force
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Solution Overview
Problem
Tape measures are prone to damage due to the exposure of the hook and tape blade to impact forces, as the hook's lower half often absorbs the impact force when the tape measure is dropped, transferring this force to the rivets and the tape blade.
Innovation Solution
A tape measure design featuring a bumper with a shoulder and recess portion that allows the hook to pivot and move upward during impact, reducing the force experienced by the hook and tape blade, with a specific ratio of upper hook height to recess width optimized for impact protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hook and tape blade are exposed for measurement functionality, then measurement accessibility is improved, but vulnerability to impact damage increases
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a bumper with a recess portion positioned below the tape opening. This recess creates a cushioning space that allows the hook to pivot and move upward during impact, absorbing impact forces before they can damage the hook and tape blade. The bumper structure is designed in advance to protect against future impact events while maintaining normal measurement functionality.
2Ease of manufacture
If the hook structure is simplified for manufacturing, then manufacturing cost is reduced, but impact protection capability is compromised
Solution Approach 1:
The patent introduces an intermediary element - the bumper with recess portion - that mediates between the simple hook structure and the impact forces. The bumper acts as a protective intermediary that allows the hook to move and pivot during impact without requiring complex reinforcement of the hook itself. This maintains manufacturing simplicity while adding impact protection capability through the intermediary bumper structure.
3Reliability
If the bumper recess width is increased to allow more hook movement, then impact force absorption is improved, but the ratio of upper hook height to recess width deviates from optimal protection range
Solution Approach 1:
The patent applies parameter changes by specifying an optimal range for the ratio of upper hook height to recess width (between 4:1 and 8:1). This parameter optimization ensures that the recess width is precisely dimensioned to allow sufficient hook movement for impact force absorption while maintaining the correct geometric relationship with the upper hook height. The specified ratio range balances impact protection effectiveness with manufacturing precision requirements.
Data Source
AI summary
A tape measure including an elongate tape blade is shown. The tape measure includes a protective bumper that extends below the tape opening. The bumper is shaped to allow the tape hook to pivot during drop or impact to reduce the impact force experienced by the tape hook.