Later he perfected the mechanism known as the “clock lock” and invented the double lock, which placed two locks within one case to be operated by the same or different combinations. Yale patented his cylinder pin-tumbler lock in 1861. When inserted into the lock, the key pushes the bottom pins into the right position, which allows the user to turn the key and unlock the lock. Though similar to the pin-tumbler lock, his father had invented years earlier, Yale’s lock used a smaller, flat key with serrated edges like the ones we still use today. A second metal pin, or “driver,” sits above the tumbler and is pushed down on the tumbler by a very small coil spring, which is permanently compressed as it sits inside the lock’s enclosed case. A metal pin, or “tumbler,” fits closely to the walls of each of the slots. The design has a main barrel, which is drilled so it has several-usually five or six-cylindrical slots that are set close together in a line. The basic concept was used in ancient Egypt around 4,000 years ago, in locks that were very large (up to two feet long) and made out of wood. Yale’s best-known lock design, however, was for a cylinder pin-tumbler lock. He patented the device, thereby securing his place as an authority on all matters pertaining to locks and safes. The design allowed its owner to change its combination and would also allow the key to secure the lock while being hidden away from the exterior of the door by a hardened steel plate, which covered the keyhole behind it. In 1851, he invented the “Yale Infallible Bank Lock” for safes and vaults. This led him to employ permanent dial and shaft designs in many of his newer locks, such as used in what most know as "combination locks" today. He had become convinced that keyholes in traditional locks made the locks susceptible to thieves who could use picks, gunpowder or other explosives. Eventually he set up his own lock business in Shelburne Falls, Mass. His father died sometime around this period and Yale became more involved in his father’s lock shop. In 1850 he decided a career in painting wasn’t for him and began devoting time to mechanical problems. The younger Yale, meanwhile, who was artistically talented, had begun serious studies in portrait painting. He opened the Yale Lock Shop in Newport, Rhode Island, in 1847. In the 1940s he created one of the first modern locks that used a pin-tumble design. The older Yale was also interested in new lock designs, and spent much of his time on bank locks. His father, Linus Yale Sr., was a successful inventor, having created sawmill head blocks and a millstone process. As a youngster, Yale possessed a great deal of mechanical skill and ingenuity. Linus Yale, inventor of a popular and effective lock that uses a pin-tumbler cylinder design, was born in Salisbury, New York, on April 4, 1821. 2023-24 InvenTeam Grants Application Open!.Student Fellows Research Program: Recruitment Open!.Celebrating Garey High School InvenTeam's Patent Award!.Bridge to Invention and Inclusive Innovation Program.
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