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2. Latch - Wikipedia

   en.wikipedia.org/wiki/Latch

   A latch bolt is an extremely common latch type, typically part of a lockset. It is a spring-loaded bolt with an angled edge. [1] [2] When the door is pushed closed, the angled edge of the latch bolt engages with the lip of the strike plate; a spring allows the bolt to retract. Once the door is fully closed, the bolt automatically extends into ...

3. Spring (device) - Wikipedia

   en.wikipedia.org/wiki/Spring_(device)

   [citation needed] Spring characteristics: (1) progressive, (2) linear, (3) degressive, (4) almost constant, (5) progressive with knee A machined spring incorporates several features into one piece of bar stock Military booby trap firing device from USSR (normally connected to a tripwire) showing spring-loaded firing pin. A spring is a device ...

4. Lockset - Wikipedia

   en.wikipedia.org/wiki/Lockset

   The latch bolt is spring-loaded and has an angled surface, allowing the door to be closed and latched without first retracting the bolt. In addition, the bolt may be fitted with a guardbolt, which is arranged to prevent the unwanted retraction of the latch bolt by an intruder; in this case the latch bolt is called a deadlocking latch bolt ...

5. Crash bar - Wikipedia

   en.wikipedia.org/wiki/Crash_bar

   Crash bar doors in a school, with upper vertical rod latches. A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar.

6. Pawl - Wikipedia

   en.wikipedia.org/wiki/Pawl

   A ratchet and pawl mechanism A parking pawl in an automatic transmission. A pawl is a movable lever that engages a fixed component to either prevent movement in one direction or restrain it altogether. As such, it is a type of latch and can also be considered a type of dog.

7. Glossary of locksmithing terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

   This independent mechanism is designed to maintain the locked state of a safe even if the lock itself is destroyed. This auxiliary locking device usually consists of a spring-loaded bolt of some type, held in check by a bracket or cable that is rigged to release the mechanism in a burglary attempt.