Telescopic Hinge Cam Surfaces Spring Compression
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Solution Overview
Problem
Current spectacle frames with telescopic hinges face inefficiencies due to incomplete spring compression and loose return function, leading to oversized components, as they rely on planar surfaces for hinge operation, which limits the utilization of spring force and increases frame size for comfort and durability.
Innovation Solution
The design introduces irregular transversal opening rest surfaces with recessed and raised intermediary areas in the hinge elements, allowing for more efficient spring biasing and centering, enabling smaller hinge components while maintaining performance by ensuring the opening rest position is predetermined and unchanging, and incorporating additional lugs for complete tilting and prevention of full tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If planar surfaces are used for hinge operation, then the hinge structure is simple, but the spring force utilization is incomplete and the return function becomes loose
Solution Approach 1:
The patent replaces planar surfaces with cam surfaces that have curved geometries. The first cam surface is formed on the front element and the second cam surface is formed on the base of the side-piece element. These cam surfaces engage during rotation to provide progressive spring compression, ensuring complete utilization of spring force and preventing loose return function while maintaining relatively simple hinge structure.
2Ease of manufacture
If planar surfaces are used for hinge operation, then manufacturing is easier, but the spring compression is not full and components must be oversized
Solution Approach 1:
The cam surfaces with curved geometries enable progressive engagement during side-piece rotation, ensuring full spring compression. This allows the spring to be smaller while maintaining the same functional performance, thereby improving spring compression efficiency without significantly complicating the manufacturing process.
Solution Approach 2:
The patent modifies the geometric parameters of the hinge surfaces by introducing cam profiles with specific curvature characteristics. This changes the engagement pattern from linear (planar) to progressive (curved), optimizing the spring compression process and allowing for reduced component sizes while maintaining strength requirements.
3Strength
If irregular opening rest surfaces with recessed intermediary areas are used, then spring force utilization is enhanced and component size is reduced, but the hinge structure becomes more complex
Solution Approach 1:
The irregular opening rest surfaces incorporate cam surfaces with curved geometries that engage during rotation. This design enhances spring force utilization through progressive compression while the complexity is managed by integrating these surfaces into the existing hinge element geometry, adding functional complexity without requiring entirely new structural components.
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 solution enhances the utilization of spring force, allowing for smaller and more efficient telescopic hinges that provide improved comfort and durability without compromising performance, addressing the inefficiencies of planar surfaces and enabling universal frame designs.
Implementation Method 1
the side-piece element of a hinge comprising a slide being jointed on the front element and mounted slidably in a sheath against and under the action of a spring
Data Source
AI summary
The present disclosure relates to a frame which comprises a front surface, extended by two lateral posts and two arms hinged to the posts about the hinge pins of two telescopic hinges, each of which, with a front surface element rigidly connected to a post and an arm element, is rigidly connected to an arm that comprises a slide hinged on the front surface element, and mounted in a sheath against a spring and slidable by means of the latter; the front surface element and the sheath of the arm element engaging, in the open position of the arm, by at least two matching transverse surfaces for stopping the opening. The surfaces that stop the opening of the two elements of each hinge are rough, the surface that stops the opening of one of the elements, of the surface, and of the arm having a hollow intermediate area. Thanks to the present method, system and device, the frame hinges have a reduced size with the same performance.