Two-Stage Hinge Link Locking for 180° Convertible Computers
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Solution Overview
Problem
Existing computing devices, such as laptops, often have limitations in their hinge mechanisms, leading to undesirable springiness of keys in tablet orientations and limited accessibility of back edges when opened to 180 degrees, which can affect user experience and functionality.
Innovation Solution
A two-stage snap hinge assembly with a detent mechanism that includes a hinge link and a detent, allowing for controlled multi-stage opening and locking of the hinge link at predefined positions, providing smooth operation and secure locking at 180 degrees, while minimizing debris entry into the hinge mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional hinge mechanism is used, then the device can be opened to various positions, but the keys exhibit undesirable springiness in tablet orientation
Solution Approach 1:
The hinge mechanism is divided into two distinct stages: a first stage for initial opening movement and a second stage for tablet orientation. This segmentation allows each stage to have optimized characteristics - the first stage provides controlled movement while the second stage locks securely to eliminate key springiness in tablet mode
Solution Approach 2:
The hinge transitions from a continuous movement mechanism to a dynamic system with discrete locked positions. The detent mechanism enables the hinge to switch between movable and locked states, providing stability in tablet orientation while maintaining operability in other positions
2Ease of operation
If the hinge is opened to 180 degrees, then full accessibility is achieved, but debris can easily enter the hinge mechanism
Solution Approach 1:
The hinge link is designed with a concave portion that receives and contains the detent mechanism. This nested structure allows the detent to be housed within the hinge assembly rather than protruding outward, creating a more enclosed mechanism that resists debris entry while maintaining full 180-degree accessibility
3Ease of manufacture
If a simple hinge design is used, then manufacturing is easier, but the hinge cannot maintain stable locking positions
Solution Approach 1:
The detent mechanism is designed to automatically engage with the hinge link at predetermined positions during the opening motion. This self-acting mechanism eliminates the need for external actuators or complex control systems, maintaining manufacturing simplicity while ensuring reliable automatic locking at stable positions
Data Source
AI summary
A device can include a first housing that includes a pivot and a hinge recess that includes a stop surface; a second housing that includes a pivot and a hinge recess; a hinge link that includes a first portion coupled to the pivot of the first housing, a second portion coupled to the pivot of the second housing, and a concave portion disposed between the first portion and the second portion, where the concave portion includes a stop; and a detent disposed in the hinge recess of the first housing, where, upon transitioning the second housing with respect to the first housing between a closed position and a fully open position, at a predefined open position, the detent forcibly biases the stop of the hinge link against the stop surface of the hinge recess of the first housing to lock the hinge link in a locked link position.