Door Lock Bolt Position Sensor with Displaceable Reed Contact
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Solution Overview
Problem
Existing monitoring devices for door locks are prone to errors due to manufacturing tolerances and settling movements over time, which can lead to faulty signal transmission between the bolt and reed contact, making them susceptible to manipulation and tamper-proofing challenges.
Innovation Solution
A tamper-proof monitoring device design featuring a bolt that interrupts the excitation of a sensor between a magnet and reed contact, with a displaceable sensor unit and a molded insert supporting the latch, along with a slidably guided magnet and adjustable eccentric rivet bolts, ensuring precise alignment and resistance to external manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bolt and reed contact are firmly fixed in the latch engagement, then the sensor unit is stable, but manufacturing tolerances and settling movements cause misalignment and faulty signals over time
Solution Approach 1:
The sensor unit is made displaceable relative to the latch engagement through a slot-shaped receptacle with a guide and locking strip, allowing the reed contact and magnet to move and self-align with the bolt while maintaining electrical connection, thereby compensating for manufacturing tolerances and settling movements
Solution Approach 2:
The relative position parameters of the sensor unit components (reed contact and magnet) are made adjustable within the slot-shaped receptacle, enabling the system to adapt to position deviations caused by manufacturing tolerances and time-dependent settling movements
2Measurement precision
If the magnet and reed contact are arranged close together, then the sensor response is sensitive, but the system becomes susceptible to manipulation by external magnets
Solution Approach 1:
The bolt itself serves as an intermediary shielding element between the magnet and external magnetic fields. When the bolt is in the locking position, it physically blocks external magnets from approaching the sensor unit, thereby preventing manipulation while maintaining close proximity of the magnet and reed contact for sensitive detection
3Ease of manufacture
If the bolt is designed with a mount for a magnet, then the bolt can be easily tracked, but the design becomes more complex and susceptible to tampering
Solution Approach 1:
The magnet mount is extracted from the bolt and relocated to the latch engagement side, where it forms part of the sensor unit housing. This allows the bolt to remain a simple, solid component without additional features that could be exploited for tampering, while the sensor unit assumes the role of magnet positioning
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 solution provides a reliable, error-free, and cost-effective monitoring system that maintains alignment between the bolt and sensor unit, enhancing security by preventing external magnet manipulation and accommodating manufacturing inaccuracies, while allowing for easy assembly and adjustment.
Implementation Method 1
A magnet is arranged next to the bolt entry opening, which is opposite a reed contact in relation to the bolt entry opening, so that the bolt enters between these in its locking position. If the bolt dips into the bolt entry opening, this influences the switching status of the reed contact.
Data Source
AI summary
The invention relates to a monitoring device, comprising a fitting-integrated monitoring unit (1), which has a number of sensor units (15) and which is connected to an evaluating unit with respect to signals and data, wherein the sensor unit (15) comprises at least one opening or closing sensor, wherein the sensor unit (15) comprises at least one reed contact (16), which interacts with a magnet (17), and the bolt (2) causes a change of the switching state of the sensor unit (15) when the bolt enters the strike plate opening (9). In order to attach the monitoring device in a manner that is sabotage-proof and difficult to detect, the bolt (2) according to the invention comes between the magnet (17) and the sensor (15) when the bolt enters the strike plate opening (9), and the sensor unit (15) is arranged in such a way that the sensor unit can be moved with respect to the position of the sensor unit in relation to the bolt (2).