Measuring Tape Removable Spool and Break Region Design
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Solution Overview
Problem
Coilable measuring tapes have a short lifespan due to deformation and breakage, requiring complete tool replacement, and their design makes removal and reinsertion of the tape complicated, limiting extension length and causing inconvenience.
Innovation Solution
A repairable coilable measuring tape with a removable spool and elongate depressions in the break region to enhance flexibility and durability, allowing easy replacement of the tape and extended measurement length without breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the measuring tape uses a resiliently-deformable material to enable coiling, then the tape can be stored in a compact housing, but the tape is prone to deformation and breakage reducing its lifespan
Solution Approach 1:
The tape is divided into multiple segments or sections with varying properties. The resiliently-deformable portion enables coiling for compact storage, while the rigid portion provides structural integrity and resistance to breakage. This segmentation allows each part to perform its specialized function optimally.
Solution Approach 2:
The measuring tape uses a composite structure combining resiliently-deformable material (such as spring metal or flexible plastic) with rigid material. This composite construction allows the tape to be coiled for storage while maintaining sufficient strength and rigidity to prevent breakage during use.
2Volume of moving object
If the tape casing is designed to house the coiled tape, then the tape can be stored compactly, but the entire tool must be replaced when the tape fails
Solution Approach 1:
The measuring tool is segmented into replaceable components: the housing/casing and the tape/spool assembly. The spool is designed to be removable from the housing, allowing users to replace only the tape/spool component when it wears out, while retaining the durable housing. This significantly improves repairability and reduces waste.
Solution Approach 2:
The design allows the durable housing to be retained and reused while the consumable tape/spool component is replaced. This discards only the necessary worn part and recovers/reuses the durable housing, improving both repairability and economic efficiency.
3Strength
If the rule tape has an arcuate cross section to provide rigidity, then the tape maintains its profile in extended positions, but the tape breaks downward at certain lengths
Solution Approach 1:
The tape cross-section is segmented into different regions with different properties. The arcuate portion provides rigidity and profile maintenance, while the flat portion extends the effective length capability and prevents breaking downward. This segmented cross-sectional design allows the tape to maintain its shape over longer distances.
Solution Approach 2:
The tape uses a composite cross-sectional design combining arcuate (curved) and flat portions. The arcuate section provides the necessary rigidity and structural support, while the flat section extends the measurement length capability and prevents the tape from breaking downward at extended lengths.
4Ease of repair
If the tape is designed to be entirely removable from the casing, then the tape can be replaced, but the removal and reinsertion procedures are complicated
Solution Approach 1:
The spool holding the tape is segmented as a separate removable component from the housing. This allows the spool to be easily detached and reattached without complex manipulation of the entire tape length, simplifying the replacement procedure while maintaining replaceability.
Solution Approach 2:
The spool is extracted as a separate, easily removable component from the housing. This extraction design allows users to remove and replace the spool (with tape) without having to manipulate the entire extended tape or disassemble the entire tool, significantly simplifying the replacement operation.
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 solution extends the service life of the measuring tape by enabling easy repair and increased measurement length without breakage, reducing user inconvenience and tool replacement costs.
Implementation Method 1
a resilient rule tape uncoilable to a substantially straight orientation
Data Source
AI summary
A measuring tape of the type including a housing enclosing a coil of a resilient rule tape uncoilable to a substantially straight orientation. The housing has first and second sidewalls joined by surrounding walls extending substantially parallel to the coil axis and defining a rule-egress-ingress opening with a rule-tape free end extending therefrom. The inventive measuring tape includes a spool holding the coil of the rule tape wound thereabout and secured to a spool-supporting wall portion of the housing such that the coiled rule-tape coil is entirely removable from the housing. The rule tape has first and second sides and extends for a length which includes a break region spaced from a free end of the uncoiled rule tape. The break region includes a plurality of discrete elongate depressions spaced from one another lengthwise along the rule-tape length.