Strapping Tool With Notched Seal Assembly for Secure Metal Strap Loops
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Solution Overview
Problem
Existing strapping tools face challenges in efficiently attaching overlapping portions of metal straps, particularly in forming a tensioned strap loop around a load, as they often require complex mechanisms like friction welding, heated blades, or mechanical deformation, which can be cumbersome and inefficient.
Innovation Solution
A strapping tool that cuts notches into a seal element and the overlapping strap portions to securely attach them, using a tensioning assembly, sealing assembly, and cutting mechanism to form a tensioned strap loop around the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If friction welding, heated blades, or ultrasonic welders are used to attach overlapping strap portions, then the attachment strength is improved, but the device complexity and operational difficulty increase
Solution Approach 1:
The sealing assembly is divided into multiple independent jaws (first jaw, second jaw, third jaw, fourth jaw), each equipped with its own cutting element. This segmentation allows each jaw to independently engage and cut notches into the seal element and strap portions, simplifying the overall mechanism while maintaining effective attachment capability
Solution Approach 2:
Instead of using complex welding or heating mechanisms to attach the strap portions, the invention inverts the approach by using cutting elements to create notches that mechanically interlock the seal element with the strap portions. This inverse method achieves secure attachment through a simpler cutting action rather than through complex joining processes
2Reliability
If mechanical deformation (crimping) or notching is used to attach strap portions, then the attachment reliability is improved, but the ease of operation deteriorates
Solution Approach 1:
The sealing assembly merges multiple functions into a single integrated unit: four jaws simultaneously engage the seal element and strap portions, each with its own cutting element. This merging of functions into one coordinated assembly simplifies operation while ensuring reliable attachment through the combined action of all jaws creating interlocking notches
Solution Approach 2:
The cutting elements are positioned and configured to automatically create notches in both the seal element and the overlapping strap portions during the sealing process. The mechanism serves itself by having the jaws and cutting elements inherently perform the notching function without requiring separate manual operations, thereby improving ease of operation while maintaining attachment reliability
3Strength
If punches and dies are used to form mechanically interlocking cuts in metal strap, then the attachment strength is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts the essential function of creating mechanically interlocking cuts from the complex punch-and-die system. Instead of using separate punches and dies that require precise alignment and complex manufacturing, the design uses integrated cutting elements mounted on jaws that perform the same interlocking function through a simpler, more manufacturable structure
Solution Approach 2:
Rather than using punches to force cuts through the strap, the invention inverts the approach by using cutting elements on jaws that create notches in both the seal element and strap portions simultaneously. This inverted method achieves the same mechanically interlocking attachment through a more easily manufactured jaw-based system
Data Source
AI summary
Various embodiments of the present disclosure provide a strapping tool configured to tension metal strap around a load and, after tensioning, attach overlapping portions of the strap to one another by cutting notches into a seal element positioned around the overlapping portions of the strap and into the overlapping portions of the strap themselves.