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Sargent & Greenleaf, Inc., more commonly known among Safe and Vault technician circles as S&G, is a U.S. company that manufactures combination locks, key-operated safe and safe deposit box locks, high security military padlocks, and associated equipment.
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]
Joseph Bradford Sargent (December 14, 1822 in Leicester, Massachusetts – July 15, 1907 in New Haven, Connecticut) was the founder of Sargent & Co., a manufacturer of locks and hardware, with headquarters in New Haven, Connecticut, and mayor of that town.
A door operator may use sensors to prevent the door from coming into contact with a user. Full Energy operators require at least 3 sensors. Low-energy operators are not required to have safety sensors, as the door is allowed to come in contact with a user, given that the kinetic energy of the moving door is limited by the reduced moving speed.
Sargent was born in Chester, Vermont on December 1, 1824. [1] He married Angelina Foster in 1847; they had one daughter. [2] In 1865, Sargent established the Sargent & Greenleaf company. [3] Later in life, he founded the Sargent Automated Railway Signal Company, one of several predecessors of the General Railway Signal company. [4]
A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.