Pistol-Grip Cable Tie Tool with Self-Locking Tensioning
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Solution Overview
Problem
Existing cable tie tools are inaccurate in applying tension and often leave protruding remnants during cutting, leading to increased complexity and cost in achieving desired tensioning and clean cuts.
Innovation Solution
A hand-held tool with a pistol-shaped housing featuring a trigger mechanism, tension mechanism with a pawl link, locking mechanism, and cut-off mechanism, including a cutting lever and adjustable biasing mechanism, optimized for precise tension application and clean cuts through a combination of guide apertures, resilient biasing, and a simplified cutting linkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If higher-quality tools are made complex to achieve desired tensioning accuracy and clean cuts, then manufacturing precision and reliability improve, but device complexity and manufacturing cost increase
Solution Approach 1:
The tool is divided into distinct functional modules: a tensioning mechanism with a pawl and ratchet for controlled tension application, a separate cutting mechanism with a cutting blade, and a housing that integrates these components. This segmentation allows each module to be optimized independently for its specific function while maintaining overall simplicity
Solution Approach 2:
The pawl and ratchet mechanism automatically maintains consistent tension through its self-locking action, eliminating the need for complex control systems. The cutting blade is automatically positioned and actuated by the tool's own mechanical structure when the cable tie reaches the cutting point, requiring no external control mechanisms
2Reliability
If higher-quality tools are made complex to achieve desired tensioning accuracy and clean cuts, then reliability improves, but manufacturing cost increases
Solution Approach 1:
Instead of using complex electronic sensors and motors to achieve reliable cutting, the patent inverts the approach by using a simple mechanical cutting blade that is passively actuated by the tensioning mechanism itself. The cutting action is a natural consequence of the mechanical tensioning process, achieved through the interaction of the cutting blade with the cable tie when it reaches the predetermined position
Solution Approach 2:
The cutting blade is designed as a simple, replaceable component that can be easily manufactured and replaced if needed. This approach prioritizes ease of manufacture and low cost over long-term durability of the cutting edge, allowing the use of simpler, cheaper materials and manufacturing processes
3Device complexity
If simple tools are used, then manufacturing cost and complexity are reduced, but tensioning accuracy and cut quality deteriorate
Solution Approach 1:
The patent introduces a cutting blade as an intermediary element between the tensioning mechanism and the cable tie. This blade acts as a dedicated cutting component that is mechanically coupled to the tool structure, providing clean cuts without requiring complex control systems. The blade's position and movement are controlled by the mechanical interaction with the cable tie itself during the tensioning process
4Ease of manufacture
If simple tools are used, then manufacturing cost is reduced, but tensioning accuracy deteriorates
Solution Approach 1:
The pawl and ratchet mechanism is pre-configured with a specific geometric relationship that inherently limits the tensioning stroke to a predetermined amount. This preliminary mechanical design ensures that each actuation of the tool applies a consistent, accurate tension to the cable tie without requiring complex measurement or control systems during 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 tool provides consistent and accurate tensioning with clean cuts, reducing manufacturing costs and improving durability while accommodating various tie tail thicknesses and allowing adjustable tension settings.
Implementation Method 1
a resilient biasing mechanism, configured to bias the cutting lever between a retracted position and a cutting position
Data Source
AI summary
The present invention provides for an improved tool for tensioning and severing an elongate cable tie having a tie head portion and a tie tail portion, said tool comprising: a pistol-shaped housing having a barrel portion extending between a distal housing end portion and a proximal housing end portion along a longitudinal axis and a handle portion extending away from said barrel portion in a direction different to said longitudinal axis; a trigger mechanism comprising an elongate trigger member extending away from said barrel portion operably forward of said handle portion and configured to pivotably move toward and away from said handle portion; a tension mechanism comprising a pawl link provided slidably reciprocatingly within said barrel portion along said longitudinal axis and operably coupled to said trigger mechanism, configured to grippingly engage the cable tie and apply tension to the tie tail when moving said elongate trigger member toward said handle portion, during use; a locking mechanism within said barrel portion and operably coupled with said tension mechanism, configured to stop operation of and lock said tension mechanism at a predetermined tension of the tie tail; a cut-off mechanism within said barrel portion and operably coupled with said trigger mechanism and said locking mechanism configured to cut the tie tail when said locking mechanism is lockingly actuated, and an adjustable biasing mechanism comprising a second biasing member provided within said barrel portion, adapted to provide a biasing load to any one of said trigger mechanism, said tension mechanism and said cut-off mechanism.