Binding Device Curved Portion Acute Angle Retention
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Solution Overview
Problem
Existing binding devices face challenges in manufacturing efficiency and cost-effectiveness while maintaining high retention strength, particularly in the extraction direction, due to complex configurations and high production costs.
Innovation Solution
A binding device with a band-like body and a head portion connected by a curved portion, featuring engagement teeth with acute angles and a movable pawl, allowing for deep engagement and easy manufacturing through die casting, enhancing retention strength and insertability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If engagement teeth and movable pawl are designed with deep engagement and acute angles to improve retention strength, then extraction resistance increases, but manufacturing complexity and cost increase
Solution Approach 1:
The band-like body and head portion are merged into a single integral structure formed by die casting. The curved portion is built-in during molding, and the engagement teeth are directly formed on the band-like body, eliminating the need for separate assembly operations and reducing manufacturing complexity while maintaining the deep engagement design for high retention strength
Solution Approach 2:
The curved portion is pre-formed during the die casting process before the binding device is assembled. This preliminary formation of the acute angle geometry enables the engagement teeth to achieve sharp profiles and deep engagement capability without requiring subsequent complex machining or assembly operations
2Strength
If engagement teeth are designed with acute angles for deep engagement, then extraction resistance increases, but manufacturing difficulty increases
Solution Approach 1:
Traditional mechanical methods for forming sharp engagement teeth (such as precision machining or multi-step molding) are replaced by die casting technology. The die casting process directly forms the acute-angled engagement teeth with sharp profiles in a single operation, achieving both high extraction resistance and manufacturing efficiency
Solution Approach 2:
The manufacturing method is changed from conventional molding or machining to die casting, which allows for different geometric parameters (acute angles, sharp edges, deep engagement features) to be achieved more easily. The die casting process parameters (molten metal injection, pressure, cooling) are optimized to produce the desired sharp tooth profiles
3Strength
If a curved portion is added to form acute angles during molding, then retention strength improves, but device complexity increases
Solution Approach 1:
The curved portion is merged into the integral structure of the band-like body and head portion. Rather than being a separate component, the curved portion is built-in during die casting, creating a unified structure that achieves the desired acute angle geometry without adding structural complexity or assembly steps
Data Source
Figure 1
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AI summary
Provided are a band-like body (40) having flexibility and a head portion (20) disposed on an end of the band-like body (40) in the longitudinal direction. The other end of the band-like body (40) in the longitudinal direction is insertable into a through-hole (23) disposed in the head portion (20) to form a loop for securing purposes. The band-like body (40) is connected to the head portion (20) through a curved portion (28), and an acute angle (e) centered on the curved portion (28) is formed between the band-like body (40) and a direction perpendicular to the direction of insertion (A) of the band-like body (40) into the through-hole (23).