Cremone bolts are decorative hardware that secures doors or windows using vertical rods. They are commonly used on patio doors and casement windows. Cremone bolts have a traditional appearance and are easy to install, but provide poor security and can be difficult to maintain. They come in various finishes and designs.
A cremone bolt is a type of hardware that uses surface-mounted vertical rods to secure a door or window. Gear bolt sets are similar to modern flush bolts, but are often much more ornamental than other varieties of modern hardware. They only secure the door along the top or bottom of the opening, whereas flush bolts generally secure both the top and bottom of the door. Due to their relatively low level of safety protection, cremone bolts are often used more for aesthetics than to keep a building safe.
The most common application for a cremone bolt is along the inside of a pair of patio doors. French doors are often used on patios and balconies, but are also found inside the home when using certain decorating styles. These bolts can be used on both leaves of the pair, or only on the inactive leaf. A set of cremone bolts can also be installed horizontally on a casement window to keep the window secure.
Cremone bolts include two interconnecting rods that run the full length of a door or the full width of a window. At one end of the rods is a bolt that protrudes into a floor plate or the frame itself. A knob or level is located where the two rods meet. When users turn the knob, the bolt lifts off the floor plate. If the knob is turned again, the latch retracts into the floor to lock the door.
Most cremone bolts can only be operated by the knob or lever at the intersection of the rods. Some specialized varieties feature a traditional lock cylinder that can be locked and unlocked from either side of the opening with a key, although this design is quite rare. Buyers can choose from a variety of finishes and designs, with brass and stainless steel being the most popular finishes. Many Cremonas are fashioned in elaborate designs and patterns to give doors an ornate look, while others are simpler and more modern.
The main advantage of the cremone bolt hardware is its traditional and distinctive appearance. These locks are also easy to use and there is typically no key to keep track of. As they are surface mounted to the door, they are simple to install and do not require lengthy preparations in the door or frame.
At the same time, these locks provide rather poor security and should be combined with more effective locking systems to keep a building truly secure. The cremone bolt, unless equipped with a cylinder, can only be operated from the inside, which can make it awkward for some applications. These locks can also be difficult to maintain as users could accidentally push the rods out of alignment during day-to-day use.
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