Opportunities to use hidden latching systems include outdoor telecom enclosures, electronic cabinets or secure storage lockers. They are particularly advantageous for outdoor enclosures in a remote location because their mounting on the interior of a compartment eliminates obvious pry points.

Viable options include both mechanical latching systems and electronic latching systems that can satisfy the aesthetic concerns of industrial designers seeking a clean, non-intrusive look and the practical concerns of mechanical designers concerned about robust performance and enhanced security and vandal resistance. The very fact of concealing the latching point obscures the most vulnerable point of attack from a potential vandal. This is important, because the longer time a compartment can resist a break-in attempt, the greater the deterrence factor.

One of the most basic and versatile mechanical options is a robust rotary latching mechanism that can be actuated remotely, and from different angles, using a cable or a mechanical linkage. With a relatively flat profile and a strong latching/triggering mechanism, it is well suited for installation where it can be hidden from view by the sheet metal of a door or panel edge.

Multi-point latching systems with multiple interior cam or stud mechanisms and recessed actuation mechanisms hidden in the door edge also provide secure latching on long-span doors without visible hardware to disrupt the exterior look of the door panel. (Figure A.) The multiple points of engagement provide a consistent grip along the full length of the door to minimize rattle, ensure consistent gasket compression, and eliminate the extreme corner pry points that could be exaggerated by flexing on long-span doors. And even if their hidden actuation points do not provide keylocking protection, they can discourage opportunistic access by unauthorized individuals.

Electronic access systems using rotary and slide-bolt mechanisms can deliver the same benefits of "hidden" performance as various mechanical latches, but with added advantages of convenient and secure remote access, and with easier installation options. (Figure B.) Electromechanical latches mounted on the frame instead of the door, eliminate the need for running wires to the moving door and can also work well with sliding panels where tight clearances would not tolerate a protruding latch on the door panel.

For operating convenience, electronic latches can be actuated using one of several potential electronic signal sources, including numeric keypads, proximity readers, RF controlled key fobs or biometrics. But electronic systems offer more than just the convenience of remote access. They can also be used as safety interlocks that prevent latch actuation when equipment is running, or as security devices that electronically prevent access when "locked out." This can be implemented as part of an electronically actuated latch, or as part of a switch lock mechanism whereby the actuation of a mechanical latch or lock electronically disables another system.

Steve Spatig is Business Development Manager, Electronic Access Solutions, Southco, Inc.
www.southco.com