Pivot Hook Door Locking Device for Crowbar Resistance
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Solution Overview
Problem
Existing door locking devices for electronic apparatuses with hinged doors are vulnerable to being pried open using a crowbar, particularly at the pivot end and abutment positions, and padlocks can be easily cut or compromised, posing a risk for crime prevention.
Innovation Solution
A door locking device featuring a pivot end wall portion with a first through-hole, an opposed wall portion with a second through-hole, a key cylinder with a movable element, and pivot hooks that interlock to secure the door by entering the second through-hole when locked, providing enhanced resistance to crowbar attacks and maintaining the door's closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a padlock with holes is used to lock the door, then the door can be locked and unlocked, but the door becomes vulnerable to being pried open with a crowbar at the pivot end and abutment positions
Solution Approach 1:
The door locking device is divided into multiple independent locking points: a first locking point at the pivot end and a second locking point at the abutment position. Each locking point has its own locking piece that can be independently actuated, distributing the security function across multiple locations rather than relying on a single padlock mechanism.
Solution Approach 2:
Instead of using a traditional padlock with holes that requires insertion from the outside, the invention uses locking pieces that extend from the door into receiving structures on the door frame. The locking action is initiated from the inside of the door, reversing the conventional approach and eliminating the need for external holes that could be exploited by prying tools.
2Object-affected harmful factors
If the door structure is reinforced to resist crowbar attacks, then crime prevention improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention introduces locking pieces as intermediary elements between the door and the door frame. These locking pieces act as mediators that transfer and distribute the mechanical strength required for security across multiple contact points, rather than requiring the door structure itself to be heavily reinforced at single critical points.
Solution Approach 2:
The door structure is strengthened locally at specific locking positions rather than uniformly throughout. The first locking point at the pivot end and the second locking point at the abutment position receive localized reinforcement only where needed to support the locking pieces, minimizing overall structural complexity while maintaining security.
3Reliability
If traditional door locking means are used, then the door can be locked, but the locking mechanism can be easily compromised by cutting the padlock or shackle
Solution Approach 1:
The invention replaces the traditional mechanical padlock system with an integrated locking mechanism where locking pieces extend from the door and engage with receiving structures on the door frame. This substitution eliminates the separate padlock component with its vulnerable shackle and hasp, creating a unified structure where the locking function is built into the door assembly itself.
Data Source
AI summary
A door locking device includes: a pivot end wall portion extending from a pivot end side of a door 131, and having a first through-hole formed therein; an opposed wall portion 20 being opposed to the pivot end wall portion when the door 131 is closed, and having a second through-hole 23A, 23B formed therein; a key cylinder including a movable element 33 configured to be displaced in accordance with unlocking/locking operation; and a pivot hook 40A, 40B configured to interlock with the movable element 33. When the door is unlocked, the pivot hook 40A, 40B retreats to an inner side of the door 131 with respect to the first through-hole, whereas when the door is locked, the pivot hook enters the second through-hole 23A, 23B via the first through-hole to keep the door 131 and a door 132 closed.