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His first patent was in 1909, inventing a door lock that turned lights on and off. [1] At the time, Schlage was a citizen of Germany residing in Berkeley, California. [2] In 1919, Schlage patented a door knob which, when pushed up, locked the door. [3] [4] This was succeeded by a door knob incorporating a push-button lock, patented in 1924. [5]
Walter Schlage had already secured several patents dating back to 1909, when he patented a doorknob that would also complete an electrical circuit so that, for instance, the lights would turn on when the door was opened. [4] However, Schlage's key invention was the bored cylindrical lock, which evolved through several iterations, including a ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 3 March 2025. There are 3 pending revisions awaiting review. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and ...
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The parts included in the typical US mortise lock installation are the lock body (the part installed inside the mortise cut-out in the door); the lock trim (which may be selected from any number of designs of doorknobs, levers, handle sets and pulls); a strike plate (or box keep), which lines and reinforces the cavity in the door jamb or frame ...
The material of the handle itself contributes to the growth of bacteria, with most door handles being constructed of stainless steel – a suitable home for bacteria. The material can affect the time bacteria can survive on door handles, but more important is the temperature and humidity of the environment.
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