Metal Spectacle Frame Bridge Recesses for Weld Stability
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Solution Overview
Problem
Conventional methods for manufacturing metal wire spectacle frames face challenges in achieving sufficient stability and integrity at the welded connections between eyepieces and the nose bridge due to small contact surfaces, leading to potential deformations and breakage, while reducing the welded zone compromises aesthetics and stability.
Innovation Solution
A method involving a one-piece metal wire nose bridge with recesses created by milling to provide an interference fit with eyepieces, allowing for more stable attachment through welding with electromagnetic induction or laser processes, reducing the number of welds and enhancing positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extensive welded zone is provided to ensure sufficient relative stability of attachment, then the stability and integrity of the frame is improved, but major deformations occur in the frame and aesthetic appearance deteriorates
Solution Approach 1:
The patent applies preliminary action by creating precise recesses in the bridge and protrusions on the eyepieces before welding. These features are formed during the bending and shaping stages, preparing the components for accurate alignment and interference fit prior to the welding operation, thereby reducing the need for extensive welded zones
Solution Approach 2:
The patent applies local quality by concentrating the attachment stability in specific localized zones through interference fits (recesses and protrusions) rather than distributing welds across extensive areas. This allows sufficient stability at critical points while maintaining aesthetic appearance in other regions
2Shape
If the welded zone is reduced to improve aesthetic appearance and reduce deformations, then the aesthetic appearance and tension states are improved, but the integrity of the joined parts in the welded zone is compromised
Solution Approach 1:
The recesses and protrusions are prepared in advance through bending and forming operations, ensuring precise geometric compatibility before welding. This preliminary preparation enables small welded zones to achieve sufficient integrity through the mechanical interference fit that precedes the welding operation
Solution Approach 2:
The patent creates a composite attachment system combining mechanical interference fit (recess-protrusion engagement) with welding. This composite approach provides both aesthetic appearance (minimal welded zone) and integrity (combined mechanical + metallurgical bonding)
3Weight of moving object
If thin metal wire structure is used to provide light weight and high flexibility, then the frame becomes lighter and more flexible, but the welded zones become vulnerable to stresses and may break easily
Solution Approach 1:
The interference fit features (recesses and protrusions) are formed during the wire shaping process before welding, providing preliminary mechanical strength and stress distribution. This prepares the thin wire structure to better withstand welding stresses and subsequent use loads
Solution Approach 2:
The patent applies local quality by reinforcing the welded zones with interference fit features at critical attachment points while maintaining thin wire construction elsewhere. This provides localized strength enhancement where needed while preserving overall light weight and flexibility
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
This method enhances the stability and integrity of the frame attachments, reduces the risk of breakage, and improves aesthetic appeal by increasing the contact surface area and precision in the welding process, while minimizing the number of welds and production time.
Implementation Method 1
allowing for more stable attachment through welding with electromagnetic induction or laser processes
Implementation Method 2
allowing for more stable attachment through welding with electromagnetic induction or laser processes
Data Source
Figure 1
Figure 2~10
Figure 3~7A
AI summary
A method of manufacturing a metal frame for spectacles of the type comprising a front frame (2) with a pair of lens-carrying eyepieces (3) of metal wire, on each of which is attached on its outermost part a hinge projection (6) for a corresponding arm (5) and a central bridge (7) for support on the nose connected to lens-carrying eyepieces (3), also having a pair of nose pads (8), is described, the method comprising the stage of providing the bridge (7) in a single piece, obtained by bending a wire of metal material, defining a central cross-piece (10), extended on opposite sides by a pair of corresponding lengths (11) of wire which are capable of being attached to corresponding lens-carrying eyepieces (3), the bridge (7) having attachment means for corresponding pads (8) for support on the nose at the respective free extremities. The method further comprises the stages of making a recess (13) by milling with the removal of material on each of the lengths (11) of central bridge (7), each recess (13) forming a respective seat having at least a partial interference fit with a respective external surface portion of the metal wire of the corresponding lens-carrying eyepieces (3) facing it in the zone of mutual attachment, making a weld between each of the lengths (11) of the central bridge and the corresponding portion of lens-carrying eyepieces (3) at the location of the respective recess (13) to attach each lens-carrying eyepiece (3) to the central bridge (7) for support on the nose.