Strike-Plate Electronic Door Lock for Standard Knob Integration

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Solution Overview

Problem

Current smart electronic door locks require battery replacement, are prone to damage from door movement, and limit design choices due to specialized doorknobs and drilling requirements for wiring.

Innovation Solution

An electric door lock device powered by various sources, including property electricity, solar, or rechargeable batteries, with components on the strike plate side, allowing use of standard doorknobs and doors without drilling, using an expansion or blocking block mechanism to lock and unlock the cam.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electronic door lock components are located inside the door, then the lock can be integrated with the door structure, but the components may get damaged or stop functioning due to door motion and slamming

Engineering Contradiction:

Improveintegration with door structureVSAvoidcomponent functionality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The electronic door lock system is divided into two separate parts: the electronic control components are mounted on the door frame (strike plate side), while the mechanical locking components remain on the door. This segmentation isolates sensitive electronics from door motion and slamming forces, preventing damage while maintaining structural integration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A cam mechanism serves as an intermediary that translates rotational motion from the doorknob into linear motion of the locking tongue. The cam is positioned on the door frame side, acting as a mediator that protects the electronic components from direct exposure to door movement while still enabling the locking function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Extent of automation

If smart electronic door locks use battery power, then the lock can operate independently, but batteries require periodic changing and may result in user lockout

Engineering Contradiction:

Improveindependent operationVSAvoidcontinuous power supply

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The system uses a power adapter that automatically connects to the door frame's electrical system, providing continuous power without requiring user intervention for battery replacement. The electronic components draw power directly from the building's electrical infrastructure through the strike plate mounting location.

Inventive Principle:

Principle #25Self-service

3Use of energy by stationary object

If electronic door locks require drilling through the door for wiring, then continuous power can be supplied, but fire doors and custom doors cannot be modified

Engineering Contradiction:

Improvecontinuous power supplyVSAvoiddoor compatibility

Core Design Contradiction:

Use of energy by stationary objectVSAdaptability or versatility

Solution Approach 1:

The electronic control components are extracted from the door and mounted on the door frame (strike plate side) instead. This eliminates the need to drill through the door for wiring, as all electrical connections are made on the frame side where the strike plate is already installed. The door itself remains unmodified, maintaining fire safety and custom design integrity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The mounting location is shifted from the door (one dimension) to the door frame (another dimension). By relocating the electronic components to the frame side where the strike plate is mounted, the system accesses power and control connections without penetrating the door structure, thus preserving door integrity while enabling continuous power supply.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

4Device complexity

If smart electronic door locks use specialized doorknobs, then the locking mechanism can be integrated, but design choices and aesthetic options are limited

Engineering Contradiction:

Improvelocking mechanism integrationVSAvoiddoorknob design options

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The doorknob and the electronic control components are segmented into separate units. The doorknob remains a standard mechanical component that can be freely selected for aesthetic and design purposes, while the electronic control system is mounted separately on the door frame. This separation allows users to choose from a wide variety of standard doorknob designs without compromising the integrated locking mechanism.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250361749A1Electric Door Lock Device

Publication Date: 2025.11.27 PIN GENIE INC

AI summary

An electronic door lock device and an electronic door lock provides electronic components on a strike plate side of a door frame rather than inside the actual door, which is a limitation to conventional electronic door lock devices. The unique design provides for flexibility in using standard doorknobs that otherwise could not be used in an electronic door lock. Electrical wiring connection need not involve the door itself for allowing flexibility in use of any door and for avoiding any disconnection of electrical wiring due to door movement when the door is opened and closed. An electromagnetic expansion block moves an auxiliary latch that locks a cam for preventing the doorknob from rotating when locked. The cam is in contact with a link strip that engages a locking tongue to lock the door. Alternatively, a blocking block moved by an electromagnetic module may be used to lock the cam.