Automatic interlocked doors

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Interlocking system controls personnel access
A novel electromagnetic interlocking system controls personnel access through the gates and doors set within the perimeter safety fencing or screens surrounding potentially hazardous machinery. This system is the latest innovation in machine safety - an electromagnetic interlocking system for controlling personnel access through the gates and doors set within the perimeter safety fencing or screens surrounding potentially hazardous machinery. A key design element in Tonali's system was to lock the door using magnetic force rather than by mechanical means and to remove the problems that plague existing gate locks due to liquid and dirt exposure in combination with the rigours of daily operation. This causes fatigue and leads to mechanical failure of the product. Using safety light curtain based technology the system control unit 'continuously monitors' the on and off state of the magnets. This ensures the system detects when the gate is open and when it is closed. Only when the gate is closed and the magnetic locking force applied, will the control system allow machine operation. A typical system comprises of electromagnetic gate locks, controller, local access control unit with 'traffic light' entry condition indication and connection cables. The maximum level of security is not always best. There are some situations, in fact, where generic control of the main entrances may suffice, assigning the more sophisticated systems to special zones inside the company. For example, in a low risk environment with a large number of persons who must access the controlled area, slim physical barriers may be selected, to avoid lines, with a rapid recognition system, while for high-risk areas the choice may go to full-height barriers and biometric recognition systems, permitting access only to authorized personnel. In the choice of the physical barrier the two main considerations of the designer are ergonomics and aesthetics: the devices must be placed in a position that is comfortable for the user and, at the same time, aesthetically pleasing. Comfort, of course, is a subjective matter; a comfortable position for a standing user may be very uncomfortable for someone in a wheelchair; this is why the products ought to be flexible, permitting great freedom of positioning of the detection devices, allowing for insertion from the left or the right, for example, to adapt to the user's possibility of movement.. Other important considerations regard the connection of the electronic components of the system. The installation of a security checkpoint must take account of certain essential factors required by the electronic control system, having to do with the positioning of the devices and their connection. In planning the positioning, besides considering the ease of use, the designer should focus on environmental conditions (electromagnetic disturbances, luminosity, temperature, humidity, etc.). In terms of interconnection, we have to consider the various technical implications involved in the installation of the gate, the wiring for the sensor and activators (magnetic contacts, electronic locks, optical and acoustic signals, etc.), and the type of communication network connected to the central processing system.

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