time lock

noun

a lock, as for the door of a bank vault, equipped with a mechanism that makes it impossible to operate the lock within certain hours.

Origin of time lock

First recorded in 1865–70

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

The three and three-quarter minutes which it is necessary to wait, while the time lock is opening, are to me golden moments.
Read ‘The King in Yellow,’ the ‘True Detective’ Reference That’s the Key to the Show | Robert W. Chambers | February 20, 2014 | THE DAILY BEAST
You see, Mr. Headland, I only use the time-lock when I have money or any special papers in the safe.
The Riddle of the Mysterious Light | Mary E. Hanshew
After the formal introduction Lady Beryl led the way into the library, wherein stood the time-lock safe.
The Riddle of the Mysterious Light | Mary E. Hanshew
Yes; it's in the vault where we keep the account books, and there's no time lock.
The Main Chance | Meredith Nicholson
Felix had been experimenting with a new type of time lock and had forgotten to throw the electrical switch that controlled it.
Whispers at Dawn | Roy J. Snell

The best locks are of the combination type, with time lock attachment.
Twenty Years a Detective in the Wickedest City in the World | Clifton R. Wooldridge

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