Synchronous Hinge Geometry Constraint Eliminates Torque Elements
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Solution Overview
Problem
Conventional double shaft hinge devices for laptops require numerous torque elements, making assembly labor-intensive and time-consuming, and are costly due to the use of concave and convex wheels and other torque positioning mechanisms.
Innovation Solution
A synchronous hinge device with a geometry constraint structure using axle sleeves between two bases, allowing the display device to rotate and position at any angle without the need for complex torque elements, featuring a system of shafts with varying radial lengths and torque elements with curved axle sleeves and sealing sheets for synchronized movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional torque positioning elements (concave wheels, convex wheels, torque pads) are used to position the display device at any angle, then the positioning function is achieved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent extracts and eliminates the complex torque positioning elements (concave wheels, convex wheels, torque pads) from the hinge device, retaining only the essential shaft structures. The positioning function is achieved through the geometric constraint of the simplified shaft system rather than through complex torque elements, directly reducing device complexity while maintaining positioning capability.
Solution Approach 2:
Instead of using active torque elements to enforce positioning, the patent inverts the approach by using passive geometric constraint through shaft design. The shafts' radial length variations and hole configurations naturally constrain the display device to specific angles without requiring additional torque-applying components, simplifying the overall structure.
2Ease of operation
If conventional torque elements with nuts are used to position the display device, then positioning functionality is achieved, but assembly labor and time increase
Solution Approach 1:
The patent removes the time-consuming torque elements and nuts from the assembly, keeping only the essential shaft structures. This extraction eliminates the need for complex assembly operations involving multiple components, directly reducing assembly time and labor while preserving the positioning functionality through the simplified shaft geometry.
3Ease of operation
If conventional double shaft hinge devices with multiple torque elements are used, then positioning capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates expensive torque elements (concave wheels, convex wheels, torque pads) from the hinge device, retaining only the essential shaft structures. This reduction in component count directly lowers manufacturing cost while the geometric constraint design maintains the positioning capability through simplified means.
Data Source
AI summary
A synchronous hinge device includes a first base having a first connecting portion and a first assembling portion. The first connecting portion has a first central groove, a first outer groove, a first through hole and a second through hole. A second base has a second connecting portion and a second assembling portion. The second connecting portion has a second central groove, a second outer groove, a third through hole and a fourth through hole. First, second, third, and forth shafts extending through the first, the second, the third, and the fourth through holes, respectively. A first torque element disposed between the first shaft and the third shaft; and a second torque element disposed between second shaft and the fourth shaft, wherein the first torque element has axle sleeves limiting the first distance, and the second torque element has axle sleeves limiting the second distance.