Door Lock Protective Device with Magnetic Cam Mechanism
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Solution Overview
Problem
Existing lock protection devices are vulnerable to tampering due to mechanical weaknesses and sound-based detection methods, allowing thieves to access locks despite additional security measures.
Innovation Solution
A protective device featuring a plate with multiple seats and cams, including first and second recesses, and pins that interact with a magnetic key to block access, utilizing elastic means and springs to rotate the rotor and prevent sliding, while second recesses create false positions to confuse potential tamperers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a keyhole protection disk with a slot is used to allow key insertion, then the cylinder becomes partially accessible through the slot, but the cylinder remains vulnerable to tampering such as glue introduction
Solution Approach 1:
The protective device is divided into multiple independent components: a fixed plate, a movable covering element, and blocking pins. The covering element can slide between locked and unlocked positions, while the pins protrude to physically block access to the cylinder when the covering element is in the closed position. This segmentation allows the device to simultaneously protect the cylinder and allow key insertion through controlled access.
2Object-affected harmful factors
If a covering element is added to cover the cylinder, then protection is improved, but the device complexity increases
Solution Approach 1:
The blocking pins are equipped with springs that automatically push them outward to block access to the cylinder when the covering element is in the closed position. When the covering element slides to the open position, the pins are retracted automatically by the springs. This self-service mechanism eliminates the need for additional actuators or complex control systems, reducing overall device complexity while maintaining effective protection.
3Object-affected harmful factors
If mechanical combination locks with disks are used, then access control is improved, but sound-based detection allows thieves to determine the opening position
Solution Approach 1:
The patent replaces traditional mechanical combination disks that produce detectable sounds with a magnetic field-based combination mechanism. Magnets are embedded in the protective device, and a magnetic key is used to interact with them. This substitution eliminates the mechanical contact and associated sounds that previously allowed thieves to detect the correct combination position through acoustic monitoring.
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 device effectively prevents unauthorized access by creating ambiguous sound patterns and false positions, making it difficult for thieves to determine the correct alignment, thus enhancing lock security without increasing manufacturing costs.
Implementation Method 1
an adapted magnetic key which contains preset second magnets adapted to mate with the first magnets provided in the cams, in order to cause the rotation of said cams
Implementation Method 2
these pins are pushed toward the outside of the respective ducts, so as to exit transversely from the lateral surfaces of the plate, by the action of adapted springs inserted in said ducts
Data Source
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AI summary
A protective device (1), particularly for a lock of a door or leaf, comprising a covering element (9) which is associated slidingly with a plate (2) that can be fixed to the door or leaf and can be positioned selectively so as to close an opening (3) for access to the lock which is provided in the plate (2), two pins (8a, 8b) being associated transversely with the plate and being adapted to block temporarily the sliding of the covering element with respect to the plate. The device comprises at least one cam, freely associated rotatably within a cavity (5) provided in the plate (2). At least one first recess (16) and at least one second recess (18) are provided in the lateral surface of the at least one cam, which have, in plan view, a mutually different shape and are adapted respectively to allow and prevent the sliding of the covering element (9).