Latch Handle Lock Status Detection Without Lock Replacement

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Solution Overview

Problem

Existing door locks, particularly deadbolt and patio locks, can be closed but not locked, posing safety risks, and existing solutions require replacing the entire lock or are complex to implement.

Innovation Solution

A device with a lock latch handle attachment and an electronic circuit enclosure using an accelerometer sensor and microcontroller to detect the lock's position, sending alerts via Wi-Fi or SMS without replacing the existing lock.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If electronic locks are used to detect lock status, then measurement precision is improved, but device complexity and cost increase due to requiring replacement of existing locks

Engineering Contradiction:

Improvelock status detection accuracyVSAvoidlock system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The invention divides the lock monitoring function into two independent parts: the existing mechanical lock remains unchanged, and a separate attachment device with accelerometer sensor is mounted on the latch handle. This segmentation allows the new sensing technology to be added without replacing or complicating the existing lock system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The accelerometer sensor acts as an intermediary between the mechanical lock components and the digital monitoring system. It indirectly measures lock status by detecting the position and movement of the latch handle, rather than directly sensing the locked/unlocked state, thereby avoiding integration complexity with the existing lock mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If magnetic sensors are used to detect lock position, then measurement precision is improved, but ease of operation deteriorates due to difficulty in sensor placement near metal housing

Engineering Contradiction:

Improveposition detection accuracyVSAvoidsensor installation ease

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The invention replaces magnetic field-based sensing with accelerometer-based mechanical motion sensing. The accelerometer detects the physical position and movement of the latch handle through mechanical acceleration forces, eliminating the need for magnetic sensors that would be shielded by metal housing and difficult to position accurately.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If existing locks are replaced with electronic locks to ensure proper locking, then reliability is improved, but loss of substance increases due to disposal of existing locks

Engineering Contradiction:

Improvelocking reliabilityVSAvoidexisting lock material

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The attachment device enables the existing lock system to provide monitoring services on its own by adding sensing capability to the latch handle. The existing lock continues to perform its primary locking function while the attachment provides the monitoring service, allowing the system to serve itself without replacement.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The attachment device with accelerometer can be mounted on various types of deadbolt and patio locks with standard latch handles, providing universal monitoring capability across different lock models without requiring lock replacement or model-specific modifications.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Measurement precision

If multiple sensors and processors are used for accurate detection, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improvelock status detection accuracyVSAvoidsensor and processor quantity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The invention combines the sensing function (accelerometer), processing function (microcontroller), and communication function (Wi-Fi module) into a single integrated attachment device mounted on the latch handle. This merging eliminates the need for separate sensor housings, processing units, and mounting mechanisms that would increase overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

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

Provides accurate lock status detection with a single installation step, addressing practical issues of power consumption and sensor placement, while maintaining compatibility with existing locks.

Implementation Method 1

uses accelerometer type sensor to determine the lock status

Methodology Applied

Scientific EffectAccelerometer: Accelerometer

Data Source

PatentUS12573252B2System or method to detect opened or closed position of a door lock in existing door lock using lock latch handle position

Publication Date: 2026.03.10 GERSHMAN VLADIMIR

AI summary

A device detects door lock's open or closed positions by using an electronic circuit mounted on the lock latch handle.