How Was The Door Lock Invented

He improved on his father s design for small key and tumbler locks and invented the first modern cylinder lock.

How was the door lock invented.

Had he always been free or was he recently freed from slavery. History of mechanical locks started over 6 thousand years ago in ancient egypt where locksmith first managed to create simple but effective pin tumbler lock that was made entirely from wood. An improved version still in use today was invented by american linus yale sr. The first documented invention of the doorknob appears in u s.

Based on a pin tumbler mechanism known to the ancient egyptians yale devised a lock that used a smaller flat key with serrated edges like those still in use today. Where did he live. The earliest patent for a double acting pin tumbler lock was granted to american physician abraham o. Patent entries for the year 1878 when a patent for improvements on a door closing device was issued to a man named osbourn dorsey.

He designed his padlock using laminated steel. Dorsey except that he was black. The origins of door locks can be traced back as far as 4000 b c where evidence was found by archaeologists in egypt greece and iraq. It consisted of the wooden post that was affixed to the door and a horizontal bolt that slid into the post.

Decorative door hardware including round knobs were introduced at the centennial exposition of 1876. These locks shared the same basic principle of pin locks today where pins of varying length prevented access to the door unless the matching key was inserted to line up the pins and access the door. In april 1924 he received a patent u s 1 490 987 for his new lock casing. Soref made a padlock that was both strong and cheap using a case constructed out of layers of metal like the doors of a bank vault.