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When the flash is fully inserted, a spring-loaded latch on the flash locks into the indentation in the middle of the flash shoe. Detachment The user presses the unlock button on the flash body, which, by means of a lever or a wedge mechanism disengages the locking latch, enabling the user to slide off the flash from the camera body.
A push switch (button) is a momentary or non-latching switch which causes a temporary change in the state of an electrical circuit only while the switch is physically actuated. An automatic mechanism (i.e. a spring ) returns the switch to its default position immediately afterwards, restoring the initial circuit condition.
A latching switch is a switch that maintains its state after being activated. [1] A push-to-make, push-to-break switch would therefore be a latching switch – each time you actuate it, whichever state the switch is left in will persist until the switch is actuated again.
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 ...
The lever then would latch in the disengaged position until the user released it again by pressing a button under the slide, whereupon tension from the striker spring would push it back to the engaged position. Thus engaging the safety also relieved some tension in the striker spring. [4]
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.