Bifurcated Dummy Lock Core for Secure Entry Prevention

Solution Overview

Problem

Existing lock systems require significant modifications to prevent ingress while allowing egress, which is costly in terms of manpower and mechanical changes.

Innovation Solution

A universal dummy lock cylinder with a bifurcated core assembly that can be easily replaced using a master key, featuring a catch mechanism to irremovably secure the core body to the housing, preventing entry without extensive modifications to the existing lock assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sophisticated lock systems are modified to prevent ingress, then security against entry is improved, but device complexity and modification cost increase

Engineering Contradiction:

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The lock system is divided into two functional segments: a permanent housing that remains installed and a removable core that can be easily replaced. The dummy core is a separate segment that fits into the housing, allowing security升级 without modifying the entire lock system. This segmentation enables simple replacement of the core component while maintaining the existing housing structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The dummy core is designed as a simple, inexpensive component that can be easily replaced when security requirements change. Rather than permanently modifying the expensive lock housing, the solution uses a disposable-like dummy core that provides security when installed and can be removed or replaced without significant cost or effort.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If lock systems are modified to prevent ingress, then security against entry is improved, but installation time and manpower requirements increase

Engineering Contradiction:

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The dummy core is pre-designed with a standardized configuration that fits into the existing lock housing without requiring on-site customization or complex assembly procedures. The catch mechanism is pre-positioned to engage with the housing features, allowing for quick installation by simply inserting and securing the pre-prepared dummy core component.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If a dummy core body is made irremovable from the door exterior, then security against key entry is improved, but ease of installation and removal decreases

Engineering Contradiction:

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The catch mechanism serves as an intermediary that bridges the dummy core and the lock housing. This intermediate component provides a simple engagement interface - the catch is received in a slot and biased outwardly to engage with the housing, creating a secure connection during normal use while allowing for tool-free removal when needed through the keyway mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9057208B2Dummy lock core

Publication Date: 2015.06.16

AI summary

A core assembly for use with a core housing of a lock assembly is defined by a bifurcated core body including interconnected first and second cylindrical members disposed in an abutting relationship. The bifurcated core body defines a first end received by an opening disposed in the core housing and a second end defining a substantially continuous surface. A slot is defined crosswise of the interconnected cylindrical members disposed between the first end and the second end of the interconnected cylindrical members. A catch is received in the slot defined by the bifurcated core body. The catch is biased outwardly from the slot for interlocking with the core housing irremovably securing the core body to the core housing.