Drawer Safety Lock with Threaded Pin Actuation

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Solution Overview

Problem

Existing safety closure devices for drawers and doors in vehicles require structural modifications and are complex due to bulky components, making them difficult to mount and expensive.

Innovation Solution

A safety closure device with a lock mechanism fixed to the drawer or door internal border and an actuation mechanism connected to the handle, using a threaded pin to screw into standard handle holes, comprising a body and a joint with a pin to directly actuate the lock, reducing bulkiness and complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing safety closure devices are used, then drawer locking function is achieved, but structural modification of drawer and handle is required

Engineering Contradiction:

Improvedrawer locking functionVSAvoidcompatibility with existing drawer and handle

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The actuation mechanism is designed with a threaded pin connection that can be screwed into standard threaded holes found on common handles (such as pull handles and lever handles), making the safety closure device universally compatible with various existing drawer and handle configurations without requiring structural modifications

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The safety closure device is divided into separate functional modules: a lock device fixed on the drawer internal side and an actuation mechanism with a body and joint that connects to the handle. This segmentation allows the actuation mechanism to be independently designed with a standardized threaded pin connection that interfaces with existing handles while the lock device remains fixed on the drawer

Inventive Principle:

Principle #1Segmentation

2Reliability

If existing safety closure devices are used, then locking function is provided, but device complexity increases due to large number of components

Engineering Contradiction:

Improvelocking functionVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The actuation mechanism merges multiple functions into a compact assembly: the body provides structural support and mounting, the joint mounted in an articulated way enables rotational movement, and the pin directly actuates the lock device. This consolidation eliminates the need for separate return mechanisms and motion transmission systems, reducing the total component count while maintaining reliable locking functionality

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If existing safety closure devices are used, then safety is ensured, but mounting difficulty increases

Engineering Contradiction:

ImprovesafetyVSAvoidmounting ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The actuation mechanism is pre-assembled as a complete functional unit with the body, joint, and pin already connected in the correct configuration. This preliminary assembly allows the installer to mount the entire actuation mechanism as a single component onto the drawer, significantly reducing installation complexity and time compared to assembling multiple separate parts on-site

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The threaded pin connection is designed to interface with standard threaded holes found on common handles, allowing the same actuation mechanism to be universally installed across different drawer and handle configurations without requiring custom mounting adaptations, thereby simplifying the manufacturing and installation process

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Reliability

If existing safety closure devices are used, then locking capability is achieved, but cost increases

Engineering Contradiction:

Improvelocking capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The actuation mechanism employs simple, easily manufactured components such as a molded body, a standard articulated joint, and a threaded pin made from common materials. These components can be produced using inexpensive manufacturing processes and are designed to be replaced if necessary, reducing overall system cost while maintaining reliable locking capability

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentEP2315894B1Safety closure device for drawers and doors

Publication Date: 2013.01.09 POLO SRL

Figure 1
Figure 2~4B
Figure 5~7B

AI summary

A safety closure device (100) for drawers or doors is disclosed, which comprises a lock device (7) designed to be fixed to a border (6) of a drawer or door for locking in closed position and an actuation mechanism (M) designed to be connected to a handle (1) and to the lock device (7), in order to unlock the lock device (7) by means of the handle (1). The actuation mechanism (M) comprises a body (2, 4) designed to be fixed in a hole (60) or the door (6) of the drawer, and a joint (3) mounted in the body (2, 4) in an articulated way. The joint (3) comprises a pin (30) to unlock the lock device (7) and a connection (31) fixed to the handle (1).