society > occupation and work > equipment > building and constructing equipment > fastenings > [noun] > lock > tumbler (3)
In mechanical applications. In a lock: †A pivoted piece through which the pressure of a spring was transmitted to the tail of the bolt, tending…
In full Chubb's lock, Chubb-lock: a patent lock with tumblers and, in addition, a lever called a detector, which fixes the bolt immovably when one…