Recessed Safe Door Handle and Lock Mechanism

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Solution Overview

Problem

Conventional safe doors have locks and handles that protrude from the surface, compromising their aesthetic appeal and providing criminals with additional leverage points for prying, thereby weakening their anti-theft functionality.

Innovation Solution

A safe door design featuring a recessed lock and door handle, where the lock and handle are installed within step holes on the door plate, with a snap-fit mechanism and steel ball connecting mechanism to prevent the handle from being used as a pry point, enhancing the prying-resistant function while maintaining an aesthetically pleasing appearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the lock and door handle are installed protruding from the door plate surface, then the installation structure is simple, but the aesthetic appearance deteriorates and provides leverage points for prying

Engineering Contradiction:

Improveaesthetic appearanceVSAvoidinstallation structure

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The door handle and lock are nested within recesses formed in the door plate surface. The recesses create stepped holes that accommodate the handle and lock bodies, allowing them to be installed in a nested configuration rather than protruding, thereby improving aesthetic appearance while maintaining structural simplicity

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The design transitions from a two-dimensional surface mounting to a three-dimensional recessed installation. By creating stepped holes with specific depth dimensions, the handle and lock are positioned in a different spatial dimension (recessed below surface), eliminating protrusion while keeping the installation structure straightforward

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the lock and door handle are installed protruding from the door plate surface, then the installation is straightforward, but the anti-theft function deteriorates due to provided leverage points

Engineering Contradiction:

Improveanti-theft functionVSAvoidinstallation ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The recessed nested installation eliminates protruding surfaces that criminals could use as leverage points. By nesting the handle and lock within the door plate recesses, the design removes the mechanical advantage points while maintaining straightforward installation through the stepped hole configuration

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The recessed design proactively prevents prying attacks by eliminating the leverage points before an attack can occur. The stepped holes create a configuration where the handle and lock are recessed below the surface, making it impossible for criminals to apply leverage, thus implementing anti-theft protection in advance

Inventive Principle:

Principle #9Preliminary anti-action

3Strength

If the door handle uses a fixed connection structure, then the structural strength is high, but the prying resistance deteriorates due to stable leverage points

Engineering Contradiction:

Improvestructural strengthVSAvoidprying resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The door handle connection transitions from a static fixed structure to a dynamic detachable structure. The steel ball and groove mechanism allows the handle to be firmly connected during normal use (providing structural strength) but can detach under prying forces (providing prying resistance by removing the leverage point)

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The connection state changes from permanently fixed to conditionally detachable. The steel ball and groove design allows the handle to maintain a fixed connection under normal conditions but can change state and detach when subjected to prying forces, thereby providing both structural strength and prying resistance

Inventive Principle:

Principle #35Parameter changes

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 recessed design reduces the pry point's operational space, increases the difficulty of prying, and enhances the safe door's prying-resistant function while minimizing damage during transportation and use, thus improving safety performance.

Implementation Method 1

a spring, wherein the steel ball is connected to one end of the limiting hole near the inner wall of the straight prism blind hole of the transmission shaft, the bolt is connected to the other end of the limiting hole, and the steel ball and the bolt are connected by the spring

Methodology Applied

Scientific EffectElastic potential energy: Elasticity

Data Source

PatentUS10808448B2Safe door with recessed lock and door handle

Publication Date: 2020.10.20 YU FENGYU

AI summary

The utility model relates to a safe door with a recessed lock and door handle, which comprises a door plate, a door handle and a lock. The door handle is recessed and installed in a first step hole of the door plate through a first connecting structure, the lock is recessed and installed in a second step hole of the door plate, and the upper surfaces of the door handle and the lock are not higher than the upper surface of the door plate. The utility model redesigns the door plate, and sets the position where a lock disc and the door handle are installed into the form of step holes, so that the lock and the door handle are recessed and installed on the door plate.