| ANSI |
American National Standards Institute. |
| Backset |
The distance from the
edge of the door to the center line of the prep in the door. |
| Chassis |
The body of
the lock itself, without any trim. |
| Cylinder |
The portion
of a lock containing the plug with keyway and a body with the pin
tumbler mechanism. The properly cut key allows the cylinder to rotate
the driver mechanism which unlocks the lock. |
| Hand |
A term used to indicate
how a door swings. Left-handed lever: from the exterior, door hinges
located on the left side. Right-handed lever: from the exterior, door
hinges located on right side. |
| Latchbolt |
A spring operated bolt
with a beveled face to permit a latching action when the door closes.
|
| Pin Tumbler Mechanism
|
Most key operated locks
provide limited access through the use of pin tumblers. |
| |
Pin Tumblers |
Small sliding pins in
a lock cylinder that work against coil springs. They prevent the cylinder
plug from rotating until the appropriate length pin is raised to the
proper height by corresponding notch depth cut in the key. Pin tumblers
usually consist of bottom pins, top pins and master pins. |
| |
Bottom Pins |
Usually a cylindrical
shaped tumbler which is often bullet shaped and comes in a variety
of lengths that correspond to the depth of the cut of the notch in
the key. |
| |
Top Pins |
Usually a cylindrical
shaped tumbler which is often flat on both ends and is installed directly
under a coil spring in the spring stack. |
| |
Master Pin |
Usually a cylindrical
shaped tumbler which is often flat on both ends, placed between the
top and bottom pin to create an additional shear line. |
| Rose |
A circular trim plate
attached to the door under the knob or lever. |
| Shear Line |
The area where the top
surface of the plug and the cylinder housing meet. The height which
the bottom pins must be raised by the key in order to rotate the key
cylinder. |
| Spindle |
Bar which connects knobs
or levers through the door and operates the lock mechanism. |
