| lock |
has spring latch bolt operated by lever or knob plus deadbolt operated by key |
| latch |
like a lock but only has spring latchbolt |
| deadlock |
like a lock but no latch. Just key operated deadbolt. |
| cylinder |
key operated barrel which is inserted into and held within the lockcase. |
| single cylinder |
key operation from one side only. Suitable for storerooms, risers. |
| double cylinder |
key operation from both sides. |
| cylinder & thumbturn |
key operation from one side, simple turn knob from other side. |
| door closer |
device which shuts door hydraulically. Can be concealed or surface mounted. Concealed door closers will suit double swing doors but surface door closers will only swing one way. |
| backcheck |
a damping action which increases the amount of oil in the chamber as the door opens to 90 deg and acts as a kind of cushion to prevent the door being flung open beyond its max opening angle. |
| delay |
an adjustment in the door closer which allows the door to hold open for up to 60 seconds. |
| lever handle |
device for operating a latch or a lock. Supplied in pairs. Try to avoid one side operation. If you specify 1 set of lever handles you will get 2 handles + 1 spindle. Sufficient for 1 door. |
| rose |
the circular or oval component upon which the lever or knob bears. Supplied in sets. |
| escutcheon |
the circular/oval component which goes underneath the rose and surrounds the cylinder barrel. Supplied in singles. |
| backplate |
a long plate combining holes for lever handle & cylinder barrel. Supplied in sets. |
