Thread Lens Fastening with Slit-Like Clamping Seat
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Solution Overview
Problem
Existing spectacle lens fastening methods are complex, require drilling holes, use clamping screws, or need threads of predetermined lengths, leading to technical and economic inefficiencies, as well as optical and mechanical disadvantages.
Innovation Solution
A spectacle lens fastening system using a thread that encloses the lens with a slit-like clamp seat and pull-out lock, featuring a resilient thin metal wire with V- or U-shaped bending deformation for non-positive locking, allowing for easy adjustment and cutting of thread length without additional tools, and using thermoplastic materials for end thickening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thread is threaded through a hole with diameter equal to thread thickness to fix the lens, then the lens can be secured to the frame, but holes must be drilled in the lens and frame, increasing manufacturing complexity
Solution Approach 1:
The clamping seat is divided into two functional zones: a wider receiving area that accommodates the thread without requiring precise hole drilling, and a narrower locking area that provides form-fit retention. This segmentation allows the thread to be inserted easily while still achieving secure fixation.
Solution Approach 2:
The clamping seat acts as an intermediary structure between the thread and the frame, providing a dedicated locking mechanism that eliminates the need for holes through the lens or frame. The seat's geometry mediates the connection by converting simple thread insertion into secure form-fit locking.
2Reliability
If clamping screws are used to fix the thread in the frame, then the thread can be securely held, but additional precision tools and complex assembly are required
Solution Approach 1:
The complex clamping screw mechanism is completely removed from the design. Instead, the frame structure itself is shaped to provide the clamping function through the geometry of the clamping seat, which uses form-fit locking to retain the thread without any additional fastening components.
Solution Approach 2:
The clamping seat is designed to automatically lock the thread in place through its own geometry. The narrowing toward the tip creates a form-fit condition where the thread is mechanically locked by the seat structure itself, eliminating the need for external clamping screws or additional fixation mechanisms.
3Adaptability or versatility
If threads of predetermined lengths are used for different spectacle frames and lenses, then specific frame-lens combinations can be accommodated, but a large number of thread variants must be kept available, increasing complexity
Solution Approach 1:
The thread length is made variable and adjustable rather than fixed at manufacturing. The free end of the thread can be cut to the required length after the spectacles are assembled, allowing a single thread design to accommodate different frame-lens combinations without requiring multiple predetermined length variants.
Solution Approach 2:
The clamping seat is designed with sufficient length and appropriate geometry to accommodate threads of various lengths. This preliminary design consideration allows flexible thread length adjustment without compromising the locking function, enabling universal compatibility across different spectacle configurations.
4Reliability
If the thread is held in through-bores by clamping screws in clamping cylinders, then the thread can be securely retained, but the technical design becomes unnecessarily complicated
Solution Approach 1:
The clamping seat structure provides self-retention through its geometric design. The narrowing toward the tip creates a form-fit condition that automatically locks the thread in place, eliminating the need for clamping screws, cylinders, or any active retention mechanism. The structure serves its own clamping function.
Solution Approach 2:
Instead of using active mechanisms (screws, springs, or adhesive) to hold the thread, the design uses a passive geometric constraint where the clamping seat's shape itself provides the retention force. The inversion is from active retention to passive form-fit locking.
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 provides a simple, economical, and robust lens attachment that avoids drilling and precision tools, enabling flexible thread length adjustment and secure locking without predetermined thread lengths, enhancing production efficiency and optical quality.
Implementation Method 1
an elastic and/or plastic deformation of the thread will occur, which provides part of the holding capacity of the pull-out lock
Implementation Method 2
an elastic and/or plastic deformation of the thread will occur, which provides part of the holding capacity of the pull-out lock
Implementation Method 3
the slit-like clamp seat consists of a V-shaped bending deformation of this metal wire with a gap that narrows towards the tip
Data Source
AI summary
A spectacle device consisting of spectacle lenses (1) and a spectacle frame (2) is provided, comprising a holder for a spectacle lens (1) made of a thread (3) that at least partially encloses the spectacle lens (1) and has an end-side pull-out locking mechanism consisting of a fixed seat. A method for fastening a spectacle lens (1) in the spectacle frame (2) by means of a thread (3) is also provided. This method is very simple and economical and does not require drilling holes with diameters equal to the thread thickness into the spectacle frame (2) or the lens, nor the use of clamping screws for the thread (3), nor the need to hold threads of a predetermined length. This is achieved by equipping the spectacle frame (2) in the contact area between the thread (3) and the spectacle frame (2) with a force-fit and friction-fit pull-out locking mechanism consisting of a slot-like clamping seat (5) for the thread (3).in which this thread (3) is held clamped on several sides and a free end (6) of the thread (3) is cut off behind the clamping seat (5).