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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

    This series would ultimately culminate in U.S. patent 1,674,841, filed in 1923, [8] which was sold commercially as the Schlage "A" series lock. [3] Schlage would later make a 1925 filing for a push button cylindrical lock fusing the two 1920 patents with the 1923 patent. [9] Schlage's first shop was at 229 Minna Street, [10] and he moved to 461 ...

  4. Bored cylindrical lock - Wikipedia

    en.wikipedia.org/wiki/Bored_cylindrical_lock

    The modern bored cylindrical lock was invented by the German-born engineer Walter Schlage [4] in 1923 [5], as an innovation on a patent filed in 1920 [6] for a lock whose installation required a face bore and surface rabbet, simplifying door preparation compared to a traditional mortise lock.

  5. New Schlage® Touchscreen Deadbolt Lock Puts Strength and ...

    www.aol.com/news/2013-01-03-new-schlage-touch...

    New Schlage ® Touchscreen Deadbolt Lock Puts Strength and Control at Homeowners' Fingertips Fully loaded multi-function lock unites Nexia ™ CARMEL, Ind.--(BUSINESS WIRE)-- Redefining what it ...

  6. Lock bumping - Wikipedia

    en.wikipedia.org/wiki/Lock_bumping

    When no key or the wrong key is in the lock, pin misalignment prevents the cylinder from turning. [ 7 ] [ 8 ] To bump a lock, a person inserts a bump key into the key way one notch (pin) short of full insertion, then bumps the key inward to push it deeper into the key way.

  7. Pin tumbler lock - Wikipedia

    en.wikipedia.org/wiki/Pin_tumbler_lock

    Each tenant is given a key that only unlocks their own door, called the change key, but the second key is the master key, which unlocks all the doors, and is usually kept by the building manager, so they can enter any room in the building. In a master-keyed lock, some or all of the pin chambers in the lock have three pins in them instead of two.

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