Door Handle Safety Lock with Limited Support Arm

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Solution Overview

Problem

Existing door locks pose risks to children as they can be easily opened, leading to potential safety hazards, and current child safety locks are complex, costly, and difficult to install.

Innovation Solution

A simple and cost-effective door handle safety lock design featuring a button with retaining ribs, a pedestal, a limited support arm, and a spring, which locks the door handle in place when not pressed, allowing easy operation with a single hand and rapid installation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional door locks are used, then the door can be easily opened, but children can accidentally open the door and go out of sight

Engineering Contradiction:

Improveease of door openingVSAvoidsafety risk to children

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The support arm is designed to be dynamically adjustable between a locked position (preventing door opening) and an unlocked position (allowing normal door operation). The button mechanism enables dynamic transition between these states, allowing adults to temporarily disable the safety lock when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The support arm acts as an intermediary mechanical element that physically blocks the door handle rotation when in the locked position. It mediates between the door handle and the door body, preventing the harmful effect (accidental opening) without permanently disabling the door's normal function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If child safety locks are used to prevent accidental door opening, then safety is improved, but the structure becomes complex and cost increases

Engineering Contradiction:

Improvesafety risk to childrenVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The safety lock is segmented into simple, distinct components: a button, a support arm with limiting grooves, and a spring. Each component has a specific function, and together they create an effective safety mechanism without requiring complex assemblies. The support arm itself is divided into a locking portion and a limiting portion with distinct grooves.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The spring provides automatic reset functionality, pushing the support arm back to the locked position after the button is released. This self-service mechanism eliminates the need for additional actuators or power sources, maintaining simplicity while ensuring the safety lock automatically re-engages.

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If complex child locks are used, then safety is improved, but assembly process becomes complicated and installation time increases

Engineering Contradiction:

Improvesafety risk to childrenVSAvoidassembly process difficulty

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The button and spring are combined into a single integrated assembly unit that fits into the door handle mechanism. The support arm is designed as a single piece with both locking and limiting portions, eliminating the need for multiple separate components and reducing assembly steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The safety lock mechanism is extracted as a separate, modular assembly that can be independently manufactured and then installed onto the door handle. This allows for specialized production of the safety components and simplifies the overall installation process, as the entire safety mechanism can be installed as one unit.

Inventive Principle:

Principle #2Taking out (Extraction)

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 safety lock effectively prevents accidental door opening by children, offering a secure, easy-to-use, and cost-efficient solution with a straightforward assembly process, reducing potential risks while being suitable for doors with centrifugal opening mechanisms.

Implementation Method 1

a spring (4), the said spring (4) is installed between the button (1) and the hole bottom of the second mounting hole (32)

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11268295B2Door handle safety lock

Publication Date: 2022.03.08 NINGBO FABE CHILD SAFETY CO LTD

AI summary

A door handle safety lock comprises a button, a pedestal, a limited support arm and a spring, the outer wall the button is provided with retaining ribs; the top of the pedestal is provided with inserting parts, a first mounting hole matched with the button is arranged in the inserting part, and the first chutes are arranged on the inner wall of the first mounting hole; the end of the limited support arm which is close to the pedestal is provided with an inserting slot which is matched with the inserting part, the outer wall of the limited support arm which is close to the pedestal is provided with a second mounting hole which is matched with the button, and the second chute are arranged on the inner wall of the second mounting hole; and the spring is installed between the button and the hole bottom of the second mounting hole.