Cutting Tool Pulling Sleeve Fastening to Prevent Cord Slippage
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Solution Overview
Problem
Existing cutting tools, such as loopers, face challenges with time-consuming knot-tying and knot-opening processes for securing the pulling means, which require dexterity and can lead to inadvertent disengagement, affecting ergonomic efficiency and smooth operation.
Innovation Solution
A fastening device with a first and second wrapping element, forming a ladder buckle, securely fastens the pulling means within the pulling sleeve, preventing slippage and disengagement by superimposing parts of the pulling means around these elements, allowing for easy assembly and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a knot is used to fasten the pulling means to the pulling sleeve, then the pulling means can be secured, but the fastening process becomes time-consuming and requires good dexterity
Solution Approach 1:
The fastening device is divided into distinct components: a mounting portion for attachment to the pulling sleeve, and wrapping elements for securing the pulling means. This segmentation allows each component to perform its specific function efficiently, eliminating the need for complex knot-tying while maintaining secure fastening.
Solution Approach 2:
The fastening device acts as an intermediary between the pulling means and the pulling sleeve. Instead of directly knotting the pulling means to the sleeve, the fastening device provides a structured interface with wrapping elements that simplify the fastening process while ensuring reliable connection.
2Reliability
If a knot is used to fasten the pulling means, then the pulling means can be secured, but the process requires good dexterity and may lead to inadvertent disengagement
Solution Approach 1:
The wrapping elements are designed to automatically secure the pulling means through their geometric configuration. The superimposition of wrapping elements creates a self-locking mechanism that maintains secure fastening without requiring continuous user intervention or high dexterity, reducing the risk of inadvertent disengagement.
Solution Approach 2:
Instead of using a flexible knot that requires manipulation, the invention uses rigid wrapping elements with fixed geometric shapes that provide structured guidance for the pulling means. This inversion from flexible to rigid fastening elements simplifies the operation and reduces dexterity requirements.
3Ease of manufacture
If a simple fastening device is used, then the design and manufacture are simpler, but the fastening may not prevent slippage of the pulling means
Solution Approach 1:
The fastening device transitions from simple linear fastening to multi-dimensional securing through the arrangement of wrapping elements in space. The wrapping elements are positioned at different locations and orientations, creating a three-dimensional fastening structure that effectively prevents slippage while maintaining manufacturing simplicity through modular design.
Solution Approach 2:
The wrapping elements are designed with asymmetric geometries and positions that specifically counteract the directional forces applied to the pulling means during operation. This asymmetric configuration optimizes the fastening performance against slippage in the critical directions while keeping the overall device structure simple and manufacturable.
Data Source
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AI summary
The invention concerns a cutting tool (100) comprising an elongated handle (102) that mounts a cutting head (104) and a pulling sleeve (114) to actuate the cutting head (104). A pulling means (120) is arranged at least partially in the elongated handle (102) to transmit an actuating force from the pulling sleeve (114) to the cutting head (104). An end of the pulling means (120) is fastened to the pulling sleeve (114) by a fastening device (122). The cutting tool (100) is characterized in that the fastening device (122) comprises a first wrapping element (140) and a second wrapping element (142) positioned adjacent to the first wrapping element (140). The end of the pulling means (120) is guided between and around the first wrapping element (140) and the second wrapping element (142) such that different parts of the end of the pulling means (120) superimpose each other so that under a tensile force the pulling means (120) tightens around the first wrapping element (140) and the second wrapping element (142).