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When the correct key is inserted, it will clear the wards and rotate about the center post. The key may then strike a lever, activating a latch or sliding bolt, or it may itself push against the latch or bolt. In a double acting lever lock, the key may additionally push against a spring-loaded lever which holds the sliding bolt in place.
The parts included in the typical US mortise lock installation are the lock body (the part installed inside the mortise cut-out in the door); the lock trim (which may be selected from any number of designs of doorknobs, levers, handle sets and pulls); a strike plate (or box keep), which lines and reinforces the cavity in the door jamb or frame ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 20 December 2024. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including exterior doors of residential and commercial buildings, internal doors, cupboard ...
Higher security lever locks (such as the five-lever) usually have notches cut into the levers. These catch the locking bolt and prevent it from moving if picking is attempted (similar to the security pins in a pin tumbler lock). The Chubb detector lock is a variation of the lever lock which was designed to detect and prevent picking attempts.
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The matchlock was a lever mechanism that simplified the ergonomics of firing. Slow match would be held clear of the flash pan in a spring-loaded pivoting arm (the serpentine). Depressing the firing lever would dip the burning match into the flash pan. The snap matchlock latched the serpentine back against spring tension. Actuating the trigger ...
Lockets usually hold only one or two photographs, but some specially made lockets can hold up to eight. Some lockets have been fashioned as 'spinner' lockets, where the bail that attaches to the necklace chain is attached but not fixed to the locket itself which is free to spin. This was a common style in the Victorian Age.
Credit card companies don't work for free. Every time you use one, the store you're buying from is charged a "swipe fee" — and that charge will get passed down to you in higher prices.
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