Single-Axis Locking Element for Vibration-Proof Container Doors

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Solution Overview

Problem

Existing locking devices for containers are complex and cost-intensive due to the need for a locking element to move along multiple axes for vibration-proof locking, which can be compromised by vibrations or jerky movements, potentially causing the door to open unintentionally.

Innovation Solution

A locking device with a drive unit that positions a locking element along a single axis to form latches with either one or both locking means, allowing for three states: open, closing, and vibration-proof locking, ensuring the door remains closed during vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a locking element is moved along multiple perpendicular axes to achieve vibration-proof locking, then the locking reliability is improved, but the device complexity increases

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

Solution Approach 1:

The patent transitions from a single-axis locking mechanism to a two-axis locking mechanism. The locking element can move along a first axis (primary locking direction) and a second axis perpendicular to the first axis (secondary locking direction). This dimensional expansion allows the locking element to engage with multiple locking surfaces simultaneously, creating a more reliable vibration-proof lock without requiring complex multi-component systems.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The locking device is segmented into multiple independent functional components: a locking element for movement along two axes, a first locking surface for primary engagement, and a second locking surface for secondary engagement. This segmentation allows each component to be optimized independently while working together to achieve vibration-proof locking, resolving the contradiction between reliability and complexity.

Inventive Principle:
Principle #1Segmentation

2Strength

If spring-loaded bolts and tumblers are used to provide positive lock, then the locking strength is improved, but the risk of unintentional door opening increases due to vibrations

Engineering Contradiction:
Improvelocking strengthVSAvoidanti-vibration reliability
Core Design Contradiction:
StrengthVSReliability

Solution Approach 1:

Instead of using spring-loaded elements that rely on elastic force to maintain locking, the patent inverts the approach by using a drive unit that actively positions the locking element along two perpendicular axes. The locking is maintained through precise positional control rather than spring force, making the system resistant to vibration-induced unintended opening while maintaining strong locking engagement.

Inventive Principle:
Principle #13The other way round (Inversion)

Solution Approach 2:

The patent replaces the traditional spring-loaded mechanical locking system with a drive unit-based positioning system. The drive unit uses controlled mechanical movement along two axes to establish and maintain locking, eliminating the reliance on spring forces that can be compromised by vibrations. This substitution provides both strong locking and vibration resistance.

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

Data Source

PatentEP2876234B1Locking device
Publication Date: 2016.10.05 WINCOR NIXDORF INT GMBH
  • EP2876234B1 patent drawingFigure 1
  • EP2876234B1 patent drawingFigure 2
  • EP2876234B1 patent drawingFigure 3

AI summary

The present invention relates to a locking device (1) for a container (2) comprising a frame (21) and a door (22), and a corresponding method. The device (1) comprises a locking module (13) and a locking module (12), which is configured for attachment to the other part (21; 22) of the container (2) and for forming a latch with the locking module (12), and includes a locking element (121) movably arranged along an axis (121-1).According to the invention, the locking module (12) can assume various states, wherein in a first state the locking element (121) is positioned at a first position (x1) by means of a drive unit (125), in which the locking element (121) does not form a latching connection with either a first locking means (131) or a second locking means (133); in a second state the locking element (121) is positioned at a second position (x2) by means of the drive unit (125), in which the locking element (121) forms a latching connection only with the second locking means (133); and in a third state the locking element (121) is positioned at a third position (x3) by means of the drive unit (125), in which the locking element (121) forms a latching connection with both the first locking means (131) and the second locking means (133).