Variable-Torque Laptop Hinge for One-Handed Opening and Wobble Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hinges in information handling systems provide constant resistive torque throughout the rotation range, failing to meet design requirements for one-handed opening and minimizing wobble, as they do not apply varying torques at different angles, leading to inefficient mobility and stability issues.
Innovation Solution
A variable-torque hinge is designed, combining constant and variable torque joints to apply different resistive forces at specific rotational ranges, ensuring low torque for one-handed opening and higher torque to prevent wobble, achieved through mechanisms like question mark bands and spring-loaded clips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant torque is applied throughout the rotation range, then the hinge provides stable resistance, but it prevents one-handed opening and causes wobble
Solution Approach 1:
The hinge transitions from a static constant torque mechanism to a dynamic variable torque mechanism that automatically adjusts resistance based on the rotation angle. The spring-loaded clip engages with different portions of the question mark band at different angles, creating a dynamic torque profile that is low during opening (45-80 degrees) and high during stabilization (90-120 degrees).
Solution Approach 2:
The torque parameter is changed as a function of rotation angle. The question mark band's varying radius creates a variable mechanical advantage, and the spring-loaded clip's engagement depth changes with angle, transforming the constant spring force into a variable torque output that adapts to different operational phases.
2Stability of the object's composition
If high torque is applied throughout the rotation range, then wobble is prevented, but one-handed opening becomes difficult
Solution Approach 1:
Different torque characteristics are applied to different angular regions. The question mark band's geometry creates localized torque variations: the narrower portion provides high torque for wobble prevention at certain angles, while the wider portion provides low torque for easy opening at other angles. The spring-loaded clip selectively engages these different regions based on rotation angle.
3Ease of operation
If variable torque mechanisms are added, then both one-handed opening and wobble prevention are achieved, but device complexity increases
Solution Approach 1:
Multiple functions are merged into a single integrated mechanism. The question mark band simultaneously serves as the torque transmission element, the variable geometry element, and the engagement guide for the spring-loaded clip. The spring-loaded clip itself provides both the variable engagement depth and the damping function, eliminating the need for separate components.
Solution Approach 2:
The question mark band performs multiple functions: it transmits torque from the spring, provides variable mechanical advantage through its changing radius, and guides the spring-loaded clip engagement. The spring-loaded clip simultaneously provides variable torque engagement and damping. This multi-functionality reduces the total component count despite the increased functional complexity.
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 variable-torque hinge enables one-handed opening by reducing torque in the 45-80 degree range and prevents wobble by increasing torque in the 90-120 degree range, enhancing mobility and stability in information handling systems.
Implementation Method 1
spring-loaded clips
Implementation Method 2
friction joint
Data Source
AI summary
A variable torque opening hinge joint for a laptop may comprise a shaft having a protrusion along its axial length and operably connecting to a display chassis inserted through a first hinge joint and a second hinge joint that are operably connected to a base chassis. The first hinge joint may apply a constant torque resistive to a rotation of the shaft throughout a range of angular displacement, and the second hinge joint may apply a variable torque resistive to a rotation of the shaft that increases from a minimum variable resistive torque to a maximum variable resistive torque over a preset subset of the range of angular displacement to reach a maximum variable torque. A leading edge of the protrusion and a trailing edge of the protrusion may be separated by an angle equivalent to the preset subset of the range of angular displacement.