double-acting lever tumbler

  n.
   one that must be lifted a precise amount, neither too little nor too much to allow movement of a bolt

Locksmith dictionary . 2014.

Look at other dictionaries:

  • Lever tumbler lock — A lever tumbler lock is a type of lock that uses a set of levers to prevent the bolt from moving in the lock. In the simplest of these, lifting the tumbler above a certain height will allow the bolt to slide past. Double acting Lever tumbler… …   Wikipedia

  • Barron, Robert —    the Englishman credited with the invention of the double acting lever tumbler in 1778 …   Locksmith dictionary

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