Magnetic Cam Lock Cover for Door Cylinder Tamper Protection
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Solution Overview
Problem
Existing lock protection devices, especially those with flat plates and oval access openings, are vulnerable to tampering and vandalism due to mechanical plays and sound identification, and are not effectively secure against adhesive substances, leading to potential lock breaches.
Innovation Solution
A protection device featuring a sliding cylindrical slider with magnetic cams and pins, controlled by a magnetic key, which rapidly and safely locks and unlocks the oval access opening, maintaining functionality even when exposed to adhesives, and is structurally simple with modest manufacturing costs.
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, but it remains exposed to tampering and vandalism through the slot
Solution Approach 1:
A magnetic key acts as an intermediary to control access. The magnetic key contains magnets that interact with magnets in the cam mechanism, enabling the user to rotate the cam and release the locking pin only when the correct magnetic pattern is presented. This mediator prevents direct manual manipulation of the locking mechanism while allowing authorized access.
Solution Approach 2:
The traditional mechanical key insertion through a slot is replaced with a magnetic field-based interaction system. The magnetic key generates a magnetic field that actuates the cam mechanism without requiring physical contact with the locking pin or cam, eliminating the vulnerability of the slot to adhesive substances and manual tampering.
2Object-affected harmful factors
If a flat plate with an oval access opening is used to cover the lock, then the lock is partially protected, but mechanical plays and sound identification allow unauthorized opening
Solution Approach 1:
The mechanical combination lock system with multiple disks is replaced with a magnetic field-based cam mechanism. The magnetic key creates a specific magnetic field pattern that directly actuates the cam to a predetermined position, eliminating mechanical plays and the production of identifying sounds that occur in disk-based systems.
Solution Approach 2:
The magnetic field serves as an intermediary between the user and the locking mechanism. Instead of direct mechanical interaction with multiple disks that produce sounds, the magnetic field silently and precisely actuates the cam mechanism, preventing sound-based identification attacks.
3Device complexity
If adhesive substances are introduced through the slot, then the cylinder can be damaged, but the device lacks protection against such substances
Solution Approach 1:
The mechanical slot-based key insertion system is replaced with a magnetic field-based actuation system. Since the magnetic key operates through magnetic fields rather than physical contact, adhesive substances cannot be introduced through a slot to damage the internal mechanism, while the overall device structure remains relatively simple.
4Productivity
If a magnetic key with magnets is used to rotate the cam, then rapid and safe activation is achieved, but the device requires magnetic field interaction mechanism
Solution Approach 1:
The manual rotation of the cam mechanism is replaced with magnetic field-based actuation. The magnetic key generates a magnetic field that directly actuates the cam to rotate to the correct position, enabling rapid activation without manual manipulation. The magnetic interaction mechanism, while adding some complexity, provides fast and safe operation.
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 secures the lock by preventing unauthorized access, avoiding malfunctions and adhesive interference, while allowing rapid and safe activation and deactivation, ensuring robust protection against tampering and vandalism.
Implementation Method 1
an adapted magnetic key (18), which contains adapted second magnets (20b) which are adapted to couple to this first magnets (20a) that are present in the cams (21a, 21b), in order to cause the rotation of said cams (21a, 21b)
Implementation Method 2
said pins are propelled toward the outside of the respective ducts so as to protrude transversely from the lateral surfaces of the plate by virtue of the action of adapted springs inserted in said ducts
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A protection device (1), particularly for a lock (2) of a door or door wing with which a flat plate (3) is associated frontally which is provided with a handle (4) and on which an oval access opening (5) for a cylinder (6) is provided, comprising a covering element (10), which is shaped complementarily to the oval opening (5) and is internally hollow, is provided with a circular front access window (13) for the cylinder (6) and with which a slider (14) is associated internally and slidingly, the slider (14) being provided externally with a temporary grip tab (16) for a magnetic key (18) and accommodating internally a combination element (19) with two or more cams (21a, 21b), which is adapted to allow/block temporarily the sliding of the slider (14) with respect to the covering element (10) in order to conceal temporarily the front window (13).