- Tumb-Turn = On the side of door equipped with cylinder lock, connected to lock cam. Operates deadbolt.
- Knob = Serves as handle, operates latchbolt.
- Front = This is the surface of the mortice lock case which appears at the cut end of the doors. It includes openings for latch bolt and deadbolt as well as holes for screws which secure it.
- Deadbolt = A lock bolt which is activated by key or thumb-turn, is square on all edges, and has no spring behind it.
- Latchbolt = That part of a lock which, because of a spring device behind it, slide in and then springs out to holt a door in position when it is closed.
- Strike = The plate recessed into the door jamb, into which deadbolt or latchbolt fits when the door is closed or locked.
- Case = Contains major lock components; the mortice type fits into the door and rim type is fastend to the surface of the door.
- Cylinder = A removable unit on high-grade lock which contains the thumblers and receives only the correct key, which when turned operates the lock.
- Backset = Horizontal distance from front surface of lock to the center of knob or cylinder.
- Spacing = Vertical distance between the center of cylinder and the cylinder of knob
Category Archives: Doors & Windows
Working parts of lock
Insulated Glass
Insulated or “double-pane” glass is required by building codes in many areas as a mandatory energy conservation measure. Insulated glass consists of two panes of glass separated by a space. The type of glass, the type of spacer, and the type of gas used in the space contribute to the overall insulating efficiency of the glass, and also the total cost.
Annealed Glass
Although annealed (ordinary) glass is probably the most common glass around, it also has the potential to be the most dangerous. When annealed glass breaks, it produces razor-sharp shards of glass that can cause terrible injury. Building codes in many parts of the world restrict the use of annealed glass in areas where there is high risk of breakage and injury, for example in bathrooms, in door panels, fire exits and at low heights in schools.
