Magnetic Bolt Recess Locking Device for Door Frames

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Solution Overview

Problem

Existing locking devices for doors, particularly those requiring electric motors and magnets, are complex and costly, lacking a simple and cost-effective solution for both locking and unlocking mechanisms.

Innovation Solution

A locking device featuring a bolt assembly and a bolt receiving device with a magnetic locking mechanism, where the locking element is moved into and out of engagement using magnetic force, allowing for a simple and electrically switchable locking and unlocking process, utilizing an electromagnet and spring-loaded components for efficient operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electric motors and magnets are used for locking mechanism, then reliable locking function is achieved, but device complexity and production cost increase

Engineering Contradiction:
Improvelocking functionVSAvoidcomponent complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the magnetic device and bolt receptacle into a single integrated component. The magnetic device is embedded within the bolt receptacle structure, eliminating the need for separate mounting brackets and reducing the number of parts. This merging approach maintains reliable locking function while significantly reducing device complexity and production cost.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The bolt receptacle serves multiple functions: it guides the bolt element during movement, provides the magnetic field for locking, and acts as the receiving structure for the bolt. By making the bolt receptacle multi-functional, the patent reduces the overall number of components needed while maintaining reliable locking operation.

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

2Reliability

If conventional electric motors are used for bolt movement, then reliable locking and unlocking is achieved, but production cost increases

Engineering Contradiction:
Improvelocking and unlockingVSAvoidproduction cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces the conventional electric motor with a magnetic field-based actuation system. The magnetic device generates electromagnetic force to move the bolt element directly, eliminating the need for mechanical motor components such as gears, shafts, and motors. This substitution maintains reliable locking and unlocking functionality while significantly reducing production cost and simplifying the manufacturing process.

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

Solution Approach 2:

The magnetic device uses electromagnetic attraction to directly move the bolt element into the locked position without requiring separate actuating mechanisms. The system essentially uses its own magnetic field to perform the work of moving the bolt, eliminating the need for external motors and reducing production cost while maintaining reliability.

Inventive Principle:
Principle #25Self-service

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 cost-effective and simpler locking mechanism that can replace conventional electric door openers, offering reliable locking and unlocking functionality with reduced component complexity and lower production costs.

Implementation Method 1

the locking element can be moved into the locked position and engaged with the locking bolt receiver by the magnetic force of the magnetic device

Methodology Applied
Scientific EffectMagnetic force: Magnetism

Implementation Method 2

the magnetic device is designed as an electromagnet

Methodology Applied
Scientific EffectElectromagnet: Electromagnet

Data Source

PatentEP3299547B1Locking device with magnetic bolt recess
Publication Date: 2020.12.30 ASSA ABLOY SICHERHEITSTECHNIK GMBH
  • EP3299547B1 patent drawingFigure 1
  • EP3299547B1 patent drawingFigure 2
  • EP3299547B1 patent drawingFigure 2a

AI summary

A locking device (1) for a leaf (6) movably mounted in a frame (5), preferably a locking device for a door in a building, comprising a bolt assembly (3) mountable on the frame (5) or on the leaf (6) and a bolt receiving device (4) mountable on the leaf (6) or on the frame (5). The bolt assembly (3) comprises a movably mounted bolt element (32) designed as a latch or bolt and an electrically switchable locking retaining device (35), and the bolt element (32) can be locked in a locked position by the electrically switchable locking retaining device (35). It is essential that the bolt receiving device (4) and/or the bolt element (32) has a magnetic device (42), and that the bolt element (32) can be moved into the locking position and brought into engagement with the bolt receiving device (41) by magnetic force from the magnetic device (42).Furthermore, it is essential that, in order to form an unlocked position of the locking element (32) when the electrical locking holding device (35) is switched off, the locking element (32) can be brought out of the engagement of the magnetic device (42) by actuating the locking element (32) and/or the magnetic device (42).