Yale is a lock manufacturer owned by Assa Abloy. It is associated with the pin tumbler lockwhich is often known as the Yale lock. Yale are currently known as one of the UK's most popular lock manufacturers, with a headquarters located in Willenhall.
FLETCHER, of Stamford, in the county of F airfield and State of Connecticut, have invented certain new and useful Improvements in Locks; and I do hereby declare the following to be a full, clear, and exact descriptipn of the invention, such as ,will enable others skilled in the art to which it appertains to make and use the same. My invention relates to an improvement in locks, of that type which is master keyed by a tumbler which lifts all the other tumblers. In locks of this type the spring pressure of the several tumblers, is transmitted to the lifter tumbler, thus causing the latter to tip sidewise, or in a direction to force the other tumblers otf the post supporting the several tumblers, when the cover plate of the lock is removed, and the object of my invention is to provide means for preventing the tipping movement of the lifter plunger.
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