Self-Acting Door Security Device with Segmented Latch and Stopper Mechanism
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Solution Overview
Problem
Existing door security systems fail to effectively prevent unauthorized entry and allow quick evacuation during emergencies, especially when the latch bolt of the lock module is not fully inserted.
Innovation Solution
A self-acting door security device that includes an insert plate, a locker plate, a fastening piece, a stop holder, and a stopper member, which can be easily installed between a door and a door frame to detect forced openings and allow door operation without latch bolt interference, even in malfunction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch bolt of a lock module is installed on a door to enable locking/unlocking operation, then the door security is improved, but the door cannot be opened when the latch bolt is not fully inserted or malfunction occurs
Solution Approach 1:
The door opening system is segmented into two independent paths: the original latch bolt path and the alternative stopper member path. When the latch bolt fails to engage properly, the stopper member provides an alternative mechanism to prevent the door from becoming stuck, allowing operation to continue through the stopper member engagement with the striker
Solution Approach 2:
The stopper member is designed with adjustable positioning along the locker plate, allowing the engagement position to be changed. This enables adaptation to different door thicknesses and striker positions, ensuring reliable operation regardless of variations in installation conditions
2Reliability
If a conventional door lock mechanism is installed on the door, then locking function is provided, but the device cannot detect forced opening by intruders
Solution Approach 1:
The stopper member is pre-positioned and spring-loaded to automatically engage with the striker when the door is in the closed position. This preliminary positioning ensures that if an intruder attempts forced opening, the stopper member will be in the correct position to detect the force and trigger the alarm before significant intrusion occurs
3Reliability
If the latch bolt is designed to engage with the latch hole for secure locking, then security is enhanced, but the door cannot be opened quickly in emergency situations
Solution Approach 1:
The door opening function is segmented between the latch bolt (for normal secure operation) and the stopper member (for emergency or malfunction conditions). The stopper member provides an alternative engagement path that can be actuated independently, allowing quick door opening when the primary latch bolt mechanism fails or during emergencies
Data Source
AI summary
Provided is a self-acting door security device including a latch bolt of a locking module installed on a swinging door and engaging with a latch hole of a striker mounted on a door frame to enable the locking/unlocking the swinging door. The self-acting door security device can be easily installed in a gap between a door and a door frame to quickly detect forced opening of the door by an intruder, thereby securing personal safety. The self-acting door security device has an improved structure such that the door can be opened without interference from a latch bolt even in a malfunction condition that the latch bolt of an existing lock module installed on the door is not fully inserted, thereby enabling quick evacuation in emergency situations including fires. The self-acting door security device includes an insert plate, a locker plate, a fastening piece, a stop holder, and a stopper member.