Bored cylindrical lock
Encyclopedia
A bored cylindrical lock
is one in which two holes are bored, perpendicular to one another, into the door
. A large hole is bored into the door face and a smaller crossbore hole is bored into the door edge, as opposed to a mortise lock
prep cut into the edge of the door. Typically, the face hole is sized from 1.5 inches to 2.125 inches (3.8 to 5.4 cm) and is centered at 2.375 inches or 2.75 inches (6.0 cm or 7.0 cm) from the leading edge of the door, this distance is referred to as the backset. Other, less popular, backsets are at 3.75 and 5 inches (9.5 and 12.7 cm). Residential doors are normally prepared for a 2.375 inch (6.0 cm) backset and commercial doors at a 2.75 inch (7 cm) backset.
in 1909.
The bored cylindrical lock arose from a need for a more cost-effective method of locking doors. The previous norm, the mortise lock, is a more complex device, and its higher manufacturing cost as well as its more labor intensive installation make the bored cylindrical lock an ideal substitute, both in price and functionality.
Lock (device)
A lock is a mechanical or electronic fastening device that is released by a physical object or secret information , or combination of more than one of these....
is one in which two holes are bored, perpendicular to one another, into the door
Door
A door is a movable structure used to open and close off an entrance, typically consisting of a panel that swings on hinges or that slides or rotates inside of a space....
. A large hole is bored into the door face and a smaller crossbore hole is bored into the door edge, as opposed to a mortise lock
Mortise lock
A mortise lock is one that requires a pocket—the mortise—to be cut into the door or piece of furniture into which the lock is to be fitted...
prep cut into the edge of the door. Typically, the face hole is sized from 1.5 inches to 2.125 inches (3.8 to 5.4 cm) and is centered at 2.375 inches or 2.75 inches (6.0 cm or 7.0 cm) from the leading edge of the door, this distance is referred to as the backset. Other, less popular, backsets are at 3.75 and 5 inches (9.5 and 12.7 cm). Residential doors are normally prepared for a 2.375 inch (6.0 cm) backset and commercial doors at a 2.75 inch (7 cm) backset.
History
The cylindrical lock was invented by Walter SchlageWalter Schlage
Walter Reinhold Schlage was a German born engineer and inventor, best known for the bored cylindrical lock and the lock company that bears his name, Schlage Lock Co..- Early Training and Travels :...
in 1909.
The bored cylindrical lock arose from a need for a more cost-effective method of locking doors. The previous norm, the mortise lock, is a more complex device, and its higher manufacturing cost as well as its more labor intensive installation make the bored cylindrical lock an ideal substitute, both in price and functionality.