Rotating Lock Mechanism with SMA Actuator for Secure Device Connection

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Solution Overview

Problem

Existing computing devices with separable portions face challenges in maintaining a secure and efficient mechanical connection, particularly in resisting tensile forces and minimizing free play, while ensuring reliable electrical communication and user experience.

Innovation Solution

A computing device with a locking mechanism featuring a rotating lock and shape memory alloy (SMA) wire actuator, which includes a heating element and magnets to securely connect and disconnect the device portions, maintaining minimal gap and free play, and ensuring electrical communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a locking mechanism is used to securely connect the first portion to the second portion, then the resistance to tensile forces is improved, but the device complexity increases

Engineering Contradiction:
Improveresistance to tensile forcesVSAvoidlocking mechanism complexity
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

The rotating lock is nested within the locking receptacle, with the locking protrusion fitting into the rotating lock's aperture. This nested arrangement allows multiple locking components to occupy minimal space while working together to resist tensile forces through rotational engagement and mechanical interlocking.

Inventive Principle:
Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent replaces traditional complex mechanical locking systems with a simplified rotating lock mechanism that uses rotational motion to engage and disengage the locking protrusion. This substitution reduces the number of mechanical components needed while maintaining the strength to resist tensile forces.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If a rotating lock with aperture is used in the locking receptacle, then the reliability of the connection is improved, but the device complexity increases

Engineering Contradiction:
Improveconnection reliabilityVSAvoidlocking mechanism complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The locking mechanism incorporates a rotating lock that can dynamically transition between locked and unlocked states through rotational motion. This dynamic element allows the system to maintain reliable connection when locked while enabling easy disengagement when rotated, balancing reliability with operational simplicity.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The rotating lock serves multiple functions: it provides the locking engagement through its aperture, acts as a release mechanism through rotation, and potentially provides tactile feedback to the user. This multi-functionality reduces the need for separate components, thereby reducing overall complexity while maintaining reliability.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Ease of operation

If an actuator with shape memory alloy wire and heating element is used to unlock the locking mechanism, then the ease of operation is improved, but the device complexity increases

Engineering Contradiction:
Improveunlocking easeVSAvoidactuator complexity
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The patent replaces manual mechanical actuation with a thermal actuation system using shape memory alloy (SMA) wire. When electrical current flows through the heating element, it heats the SMA wire, causing it to change shape and automatically trigger the unlocking mechanism. This substitution provides ease of operation through simple electrical activation while reducing the need for complex mechanical linkages.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The shape memory alloy wire undergoes a phase transition when heated by the heating element. This phase change causes the SMA wire to change its physical shape, which in turn actuates the unlocking mechanism.利用材料本身的相变特性实现解锁功能,避免了复杂的机械传动结构。

Inventive Principle:
Principle #36Phase transitions

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 solution provides a secure, efficient, and user-friendly connection that resists significant tensile forces with minimal movement, maintains electrical communication, and allows for easy unlocking via thermal actuation, enhancing the device's usability and reliability.

Implementation Method 1

The actuator may include a shape memory alloy (SMA) wire and a heating element connected to the SMA wire

Methodology Applied
Scientific EffectShape memory alloy: Shape Memory Alloy

Implementation Method 2

The computing device may include an actuator mechanically coupled to the locking mechanism and configured to unlock the first portion from the second portion. The actuator may include a shape memory alloy (SMA) wire and a heating element connected to the SMA wire

Methodology Applied
Scientific EffectJoule heating: Joule Heating

Implementation Method 3

The computing device may include one or more magnets proximate the locking mechanism

Methodology Applied
Scientific EffectMagnetism: Magnetism

Data Source

PatentUS10571974B2Locking mechanism
Publication Date: 2020.02.25 MICROSOFT TECHNOLOGY LICENSING LLC
  • US10571974B2 patent drawing
  • US10571974B2 patent drawing
  • US10571974B2 patent drawing

AI summary

A computing device is described. The computing device may include a first portion and a second portion separably connected to the first portion. A locking mechanism may be configured to lock the first portion to the second portion. The locking mechanism may include a locking receptacle connected to the first portion and a locking protrusion connected to the second portion. The locking receptacle may include a rotating lock and may have an aperture through which the locking protrusion is insertable. The computing device may include an actuator mechanically coupled to the locking mechanism and configured to unlock the first portion from the second portion.