Double-Screen Rotary Shaft Structure for Minimal Gap Closure
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Solution Overview
Problem
Conventional pivot shaft structures for electronic devices with double shafts fail to maintain a minimal gap between movable components when closed, leading to interference and increased size, which hinders miniaturization and lightweight design.
Innovation Solution
A double-screen rotary shaft structure with a base seat, link shafts, synchronous spiral channels, restriction members, and slide members that allow for synchronized rotation and sliding, ensuring a minimal gap between components when opened or closed, and applying torque to maintain support at any angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the two shafts is increased to avoid interference when closed, then the two movable components can close without interference, but the stretched area and occupied room increase
Solution Approach 1:
The patent employs dynamic adjustment of the shaft distance through a spring-loaded mechanism. The two shafts are positioned at different distances from the rotating axis: when closed, the shaft closer to the axis allows components to close without interference; when stretched open, the spring pushes the shafts apart to maximize the stretched area. This dynamic positioning resolves the contradiction between avoiding interference and maximizing stretched area.
Solution Approach 2:
The distance between shafts is changed as a variable parameter rather than a fixed dimension. The spring mechanism allows the shaft separation distance to vary between a minimum value (when closed) and a maximum value (when stretched open). This parameter change enables the system to adapt to different operational states, avoiding interference during closure while maximizing stretched area during extension.
2Volume of moving object
If the distance between the two shafts is increased to maximize stretched area, then the stretched area increases, but the two movable components interfere with each other when closed
Solution Approach 1:
The spring-loaded mechanism dynamically adjusts shaft separation based on operational state. During stretched open operation, the spring maintains maximum shaft separation to maximize stretched area. During closure, the mechanism allows the shafts to move closer, with the shaft nearer the rotation axis positioned to prevent interference. This dynamic behavior resolves the contradiction between maximizing stretched area and preventing closure interference.
Solution Approach 2:
The spring mechanism preliminarily positions the shafts at an optimal distance before operation begins. The spring is pre-loaded to maintain shafts at a distance that maximizes stretched area, but the design anticipates closure operations by positioning at least one shaft closer to the rotation axis, thereby preliminarily preventing interference before closure actually occurs.
3Volume of moving object
If the shafts are positioned closer to each other to minimize occupied space, then the occupied room decreases, but the two movable components cannot close without interference
Solution Approach 1:
The patent introduces asymmetry in the shaft positioning: the two shafts are not equidistant from the rotation axis. One shaft is positioned closer to the axis than the other. This asymmetric arrangement allows the closer shaft to define a smaller clearance zone that prevents interference during closure, while the farther shaft can be pushed outward by the spring to maximize stretched area. The asymmetric design resolves the contradiction between minimizing occupied space and preventing interference.
4Adaptability or versatility
If a double shaft structure is used to synchronously locate two movable components, then the components can be positioned at different open angles, but the structure complexity increases
Solution Approach 1:
The patent combines multiple functions into the dual shaft structure: both shafts are rigidly connected to the common rotation axis and share the same rotational motion, providing synchronous positioning capability. The spring mechanism is integrated between the two shafts to provide both structural support and distance adjustment functionality. This merging of functions allows different open angles to be achieved while managing structural complexity through functional integration.
Solution Approach 2:
The dual shaft structure serves multiple purposes: it provides synchronous positioning for different open angles, maintains structural rigidity during rotation, and enables distance adjustment through the spring mechanism. The spring itself serves dual functions of maintaining shaft separation and allowing dynamic adjustment. This multi-functionality reduces the need for additional separate components, managing overall system complexity while achieving versatile positioning.
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
The structure ensures that the movable components maintain a minimal gap when opened or closed, preventing interference and optimizing the compactness and usability of the electronic device.
Implementation Method 1
At least one synchronously extending spiral channel being disposed on a surface of each of the two link shafts; at least two bosses being disposed on the synchronous assembly, the two bosses being respectively inlaid in the spiral channels of the two link shafts
Implementation Method 2
A synchronously extending oblique guide channel is disposed on one side of each slide member and directed to the two link shafts. The protruding pillars are fitted in the oblique guide channels
Implementation Method 3
Two link assemblies slidably pivotally fitted on the two link shafts; each link has a driving end pivotally connected with the link assembly and a driven end extending into the transverse slot of the connection member
Data Source
AI summary
A double-screen rotary shaft structure includes two synchronous spiral channels disposed on the link shafts. Asynchronous assembly is slidably pivotally fitted on the two link shafts. Two bosses are disposed on the synchronous assembly and respectively inlaid in the spiral channels of the link shafts. Two connection members are respectively securely connected with the two link shafts. Two link assemblies are respectively pivotally fitted on the link shafts to synchronously move with the synchronous assembly. Two slide members are attached to lower sides of the connection members and formed with oblique slots. A guide slide connection member is disposed in each oblique slot and connected with the link assembly. The middle sections of two links are pivotally disposed on the connection members. Each link has a driving end pivotally connected with the link assembly and a driven end to drive the slide member.