Hinge Assembly for Clamshell Mobile Device Input Area
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Solution Overview
Problem
Conventional clamshell mobile devices have limited input device size due to overlapping housings and bulky hinge assemblies, restricting the size of input devices like keyboards and displays when in the open configuration.
Innovation Solution
A hinge assembly with a spine, link arm assembly, and end caps that allows the upper and lower housings to rotate 180°, maintaining a constant gap and enabling larger input devices without overlapping, while providing a smooth and aesthetically pleasing design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If conventional hinge assemblies are used in clamshell devices, then the device can open and close, but the upper and lower housings overlap when open, limiting the size of input devices
Solution Approach 1:
The hinge assembly is divided into separate functional components: a spine providing the rotation axis, link arms for motion transmission, and end caps for structural support. This segmentation allows each component to be optimized independently, enabling the housings to move without overlapping while maintaining a compact form factor.
Solution Approach 2:
The link arm assembly acts as an intermediary mechanism between the spine and the housings. It translates the rotational motion at the spine into coordinated movement of the upper and lower housings, ensuring they move in a way that prevents overlap while maximizing the available area for input devices.
2Strength
If housings are separated by a bulky hinge assembly when open, then the hinge provides structural support, but input devices cannot extend across housings
Solution Approach 1:
The hinge assembly is segmented into a compact configuration where the link arms are positioned to provide structural support only where needed. This allows the housings to be closer together when open, enabling input devices to extend across them without interference from a bulky hinge structure.
Solution Approach 2:
The hinge assembly is designed to operate in a compact spatial arrangement where the link arms move through a constrained path. This dimensional optimization allows the hinge to maintain structural strength while occupying minimal space, permitting input devices to extend further across the housings.
3Volume of moving object
If housings overlap when open, then the device maintains a compact form, but the size of input devices must be reduced
Solution Approach 1:
The hinge assembly enables dynamic movement of the housings through a controlled arc, transitioning from a closed position to an open position where they do not overlap. This dynamic motion allows the device to maintain a compact form when closed while providing maximum space for input devices when open.
Solution Approach 2:
The hinge mechanism utilizes a three-dimensional motion path that allows the housings to clear each other when open without increasing the device's footprint when closed. By moving in multiple dimensions rather than simply pivoting in a plane, the housings can be positioned to maximize input device area while maintaining overall compactness.
Data Source
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AI summary
A mobile device includes a first housing, a second housing, and a hinge assembly rotatably coupling the first housing to the second housing and enabling movement of the device between an open configuration and a closed configuration. The hinge assembly includes a pair of link arm assemblies each including a first linkage arm configured for engaging the first housing and a second linkage arm configured for engaging the second housing. When the device is in the open configuration, the first housing is planar with the second housing.