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A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]
Coiled springs appeared early in the 15th century, [2] in door locks. [3] The first spring powered-clocks appeared in that century [3] [4] [5] and evolved into the first large watches by the 16th century. In 1676 British physicist Robert Hooke postulated Hooke's law, which states that the force a spring exerts is proportional to its extension.
A doorstop (also door stopper, door stop or door wedge) is an object or device used to hold a door open or closed, or to prevent a door from opening too widely. The same word is used to refer to a thin slat built inside a door frame to prevent a door from swinging through when closed.
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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 ...
The Big Book, first published in 1939, was the size of a hymnal. With its passionate appeals to faith made in the rat-a-tat cadence of a door-to-door salesman, it helped spawn other 12-step-based institutions, including Hazelden, founded in 1949 in Minnesota. Hazelden, in turn, would become a model for facilities across the country.
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