Door handle

The traditional door knob has a bolt or spindle running through it that sits just above a cylinder, to which the spindle is connected. Turning the knob pulls the cylinder in the direction of the turn. The end of the cylinder is the 'latch bolt' (more simply known as the 'latch'), which protrudes into a space carved out of the door frame, and which prevents the door from being opened if the knob is not turned. A spring or similar mechanism causes the latch to return to its protruding state whenever the knob is not being turned. escutcheon plates are the keyhole covers, usually circular, through which keys pass to enter the lock body. If the door handles have a square or rectangular plate on which the handle is mounted this is called the backplate. The backplate can be plain (for use with latches), pierced for keyholes (for use with locks), or pierced and fitted with turn knobs and releases (for use with bathroom locks). The plate on the front edge of the lock where the latch bolt protrudes is called the faceplate.Outside door handle of a 1998 Lincoln Town Car, featuring digital lock.Outside door handle of a 1996 Lancia Y, hidden on the B pillar.Inner door panel of a 1998 Lincoln Town Car, featuring a chromed door handle often associated with luxury cars.Inner door handle of a 2010 Porsche 911 GT3 RS, consisting of a canvas strap for weight reduction.Door latch at Madingley Hall, CambridgeshireOrnate door handle on a Moravian Church.A door handle in the center of a door in ParisHead shaped doorknob, FlorenceThe doorknobs at Glen Eyrie castle in Colorado SpringsTraditional door handles in KoreaA Tulip Schlage doorknob'Crash bar' handle installed on a glass exterior doorLever-style door handleCommercial duty lever door handleDoor handles designed by Ferdinand Kramer, 1925A door handle in Theatro Circo, Braga, PortugalKnob has crescent-shaped bar which pulls back latchbolt when turned. Version on upper right has a lock; version on upper left does not. Kwikset uses this shape. Other companies have square or D-shaped bars.an incorrectly installed door handle in an inn in Stuttgart, Baden-Württemberg, Germany The traditional door knob has a bolt or spindle running through it that sits just above a cylinder, to which the spindle is connected. Turning the knob pulls the cylinder in the direction of the turn. The end of the cylinder is the 'latch bolt' (more simply known as the 'latch'), which protrudes into a space carved out of the door frame, and which prevents the door from being opened if the knob is not turned. A spring or similar mechanism causes the latch to return to its protruding state whenever the knob is not being turned. escutcheon plates are the keyhole covers, usually circular, through which keys pass to enter the lock body. If the door handles have a square or rectangular plate on which the handle is mounted this is called the backplate. The backplate can be plain (for use with latches), pierced for keyholes (for use with locks), or pierced and fitted with turn knobs and releases (for use with bathroom locks). The plate on the front edge of the lock where the latch bolt protrudes is called the faceplate. Door handles can be and have been made out of a wide variety of materials. Just a few examples include brass, white porcelain, brown mineral, cut glass, wood, and Victorian bronze.