Rotary Handle Locking Mechanism for Tool Box

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Solution Overview

Problem

Existing locking devices for tool boxes are costly to produce and compromise on longevity or robustness, lacking a balance between ease of operation, durability, and affordability.

Innovation Solution

A tool box with a locking mechanism featuring two pivotable housing parts and a rotary handle with a spring-elastic actuating element, incorporating a latching mechanism that ensures secure closure and easy operation, including a rotary cam, stop cam, and latching tongue for precise positioning and snap-action locking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a complex locking mechanism is used to ensure robustness and durability, then the reliability of the closure device is improved, but the manufacturing cost increases significantly

Engineering Contradiction:

Improverobustness of closure deviceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The locking mechanism is divided into separate functional components: a rotary handle for operation, a spring-elastic actuating element for automatic engagement, and a latching means for securing. This segmentation allows each component to be manufactured independently using cost-effective methods while maintaining overall reliability through their coordinated interaction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The spring-elastic actuating element automatically engages the latching means with the abutment section when the housing parts are closed, without requiring manual intervention. This self-service mechanism ensures reliable locking while simplifying the operation and reducing the need for complex manual locking systems.

Inventive Principle:

Principle #25Self-service

2Ease of manufacture

If a simple and cost-effective closure device is manufactured, then the manufacturing cost is reduced, but the longevity and robustness of the closure device deteriorates

Engineering Contradiction:

Improvemanufacturing costVSAvoidlongevity of closure device

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The rotary handle is designed to rotate between a closed position (where the latching means engages the abutment section) and an open position. This dynamic mechanism allows the simple, cost-effective structure to provide reliable locking when closed while enabling easy opening when needed, thus ensuring both longevity and operational flexibility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The spring-elastic actuating element rapidly engages the latching means with the abutment section during the closing motion, ensuring quick and secure locking. This rushing through of the engagement process prevents partial engagement and ensures the closure device achieves its full locking capability immediately, enhancing both reliability and longevity.

Inventive Principle:

Principle #21Skipping (Rushing through)

3Reliability

If a rigid locking lug is used to provide a secure connection between housing parts, then the reliability of the locking device is improved, but the ease of operation deteriorates

Engineering Contradiction:

Improvesecure connection between housing partsVSAvoidease of opening and closing

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The spring-elastic actuating element is pre-loaded to automatically engage the latching means with the abutment section as the housing parts come together during closing. This preliminary action ensures the locking connection is established before the user needs to apply force to open, making the closing operation simple and the locking secure simultaneously.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of requiring the user to manually engage a rigid locking lug, the design inverts the operation: the user simply closes the housing parts and the spring-elastic actuating element automatically performs the locking action. To open, the user rotates the handle in the opposite direction, and the spring automatically disengages the latching means, making operation easy while maintaining secure connection.

Inventive Principle:

Principle #13The other way round (Inversion)

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, durable, and user-friendly locking mechanism that prevents unintentional opening, ensuring tools remain secure and easily accessible, even in challenging working conditions, with a design that enhances longevity and safety.

Implementation Method 1

incorporation of a spring-elastic actuating element, so that it can rotate on a first housing part

Methodology Applied

Scientific EffectSpring-elastic actuation: Spring

Data Source

PatentEP2412493B1Locking mechanism

Publication Date: 2015.10.07 HAZET WERK HERMANN ZERVER GMBH & CO KG

Figure 1
Figure 2a~3
Figure 4a~4b

AI summary

The box has tub-like, rectangular housing parts (2, 3) pivotably coupled with each other around a pivot axis in a region of a rear side. The housing parts are locked by a closure device in a closed condition. The closure device is arranged at a front side of the housing parts. The closure device includes a rotary handle (8), which is rotatably arranged at the front side in a retainer by integration of spring elastic control elements (20) i.e. helical springs, at one of the parts. A stop unit i.e. pin, at the handle is brought into engagement with a counter bearing section at the other part.