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Locksmiths use power transfer products quite frequently. Sometimes they are used to bring switch contacts from an exit device off a door, or power to a latch retraction exit device, or most recently to bring maglock power and gate position sensor from a swinging gate.
Frequently, a customer specifies that any added hardware be discrete. This means aesthetically pleasing, and also hopefully, less vulnerable to attack. If it not obtrusive, it will be less likely to draw attention to itself, as a target for destruction.
Door cords are nothing new. One of my earliest recollections of a door loop was the kind used for security on roll-up doors. It fastened on the door and the stationary door frame, and had interlocking plugs which connected the two halves. Each interlocking plug had a reinforcing chain that acted as a strain relief, so that in the event of a forced entry where the connectors weren't manually separated prior to opening the door, or if the alarm owner simply forgot to separate the connectors and yanked the door open; the door loop would not self destruct.
Another classic was the coiled cord, which was typically used on tilting casement windows with on-glass security protection. The circuit would not be interrupted regardless of the window position.
The coiled cord was also referred to as a traveler cable. These were used on overhead and sliding doors, and on elevator gondolas, as well as on intercoms and cameras.
So power transfer devices are used to carry power to or monitor hardware on a moving door. In most cases they provide uninterrupted connections, regardless of the door's position.
SECURITECH POWER TRANSFER SYSTEM
One notable exception is a power transfer device used for electromagnetic locking devices which is offered by Securitech . The unique Securitech Yamaka system is installed at the top of the door and the header.
The door module includes two spring loaded stainless steel tips. The header plate includes two stainless steel transfer strips. When the door closes, the tips mate with the strips. Power (or signal) can be transferred to the control trim or other device.
• Concealed Module Installs Easily Into Aluminum Or Hollow Metal Doors
• Transfers Low Voltage Or Signal From Switch Via 18 Gauge Wire
• Stainless Steel Transfer Tips & Plates To Resist Rust & Corrosion
• Tested To Over 2 Million Cycles
• Wide Transfer Strips For Easy Installation
• Adjustable Slot Allows Door Module To Be Raised In Case Door Shifts
• Does Not Require Special Door Or Frame Preparation
• Ideal For Use with Electrically Released Trim
• May Be Used With Other Electrified Products - (Electric Strikes On Inactive Leaf)
Securitech electrified mini-hinges are another unique approach to power transfer, which brings distinct advantages over other solutions for doors outfitted with continuous hinges.
The electrified mini-hinge is installed above the full length hinge, but 1-½” is cut from the full length hinge to allow space for the mini-hinge. Power is transferred from the frame to the door invisibly.
• Allows Easy Testing Of Electric Locking Systems Without Removing Door
• Installs Above Full Length Continuous Hinge
• Choose From Full Mortise, Half- Surface & Full Surface Models
• Wire Transfer Through The Bearing Eliminates Pinching & Wear & Tear
• Channel Drilled In Hinge Section For Clean Wire Routing
• Tested For Over 1 Million Cycles
• Special High Tensile Wire Resists Fraying & Cracking
For more information, visit www.securitech.com.