Illustrated Guide to Door Hardware: Design, Specification, Selection by Tobias Scott;

Author:Tobias, Scott; [Tobias, Scott]
Language: eng
Format: epub
Publisher: Wiley
Published: 2015-04-13T00:00:00+00:00

Thumb Turn

A thumb turn is a rotating part of a lockset that rotates and operates the deadbolt if included as a feature in the device. The thumb turn extends and retracts the latch or bolt, and it is typically installed on the inside of the door opening, allowing those securely inside to operate the thumb turn to unlock or lock the door from the inside of the space. A thumb turn may have limited operation, such as a classroom deadlock, which will only allow the user to unlock or disengage the deadbolt from the strike plate in lieu of both locking and unlocking it. This is a security feature that prevents someone with bad intentions from locking themselves in a public space with others, prohibiting the entry of rescuers from the outside.

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