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Under the trade name Von Duprin (a blend of the three principals names, VONnegut, DUpont, PRINzler) the Von Duprin Safe Exit Device, as it was called, was manufactured and distributed by the Vonnegut Hardware Company. [4] Manufacturing took place in Indianapolis (also in Chicago and Canada in later years).
Allegion plc is an American Irish-domiciled provider of security products for homes and businesses.. Though it comprises thirty-one global brands, including CISA, Interflex, LCN, Schlage and Von Duprin, the company operates through two main sections: Allegion International and Allegion Americas. [4]
An electric strike is an access control device used for door frames. It replaces the fixed strike faceplate often used with a latch (also known as a keeper). Like a fixed strike plate, it normally presents a ramped or beveled surface to the locking latch allowing the door to close and latch just like a fixed strike would.
Von Kleist knew that the glass would provide an obstacle to the escape of the "fluid", and so was convinced that a substantial electric charge could be collected and held within it. He received a significant shock from the device when he accidentally touched the nail through the cork while still cradling the bottle in his other hand.
The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation.
The Krieger electric landaulet had a drive motor in each front wheel with a second set of parallel windings (bifilar coil) for regenerative braking. [7] The Orwell Electric Truck introduced by Ransomes, Sims & Jefferies in England during WW1 used regenerative braking switched in by the driver.
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