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2. Walter Schlage - Wikipedia

   en.wikipedia.org/wiki/Walter_Schlage

   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]

3. Schlage - Wikipedia

   en.wikipedia.org/wiki/Schlage

   However, Schlage's key invention was the bored cylindrical lock, which evolved through several iterations, including a 1917 filing for a mortise mechanism which locked when the knob was tilted, [5] one in April 1920 for a lock requiring one hole and a surface rabbet rather than a complex mortise pocket, [6] and another the same year in October ...

4. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.

5. Door handle bacteria - Wikipedia

   en.wikipedia.org/wiki/Door_handle_bacteria

   A door may be held open with a device such as a door holder [1] or door closer, [2] which can automatically release the door upon the sound of a fire alarm and protect a building in the event of a fire. An ultraviolet door handle attendant can be installed to sterilize the existing handle. Automatic door handle sanitisers are used mainly in ...

6. Kentuck Knob - Wikipedia

   en.wikipedia.org/wiki/Kentuck_Knob

   Kentuck Knob, also known as the Hagan House, is a house in rural Stewart Township near the village of Chalkhill in Fayette County, Pennsylvania, United States. Designed by the American architect Frank Lloyd Wright , it is 45 miles (72 km) southeast of Pittsburgh . [ 3 ]