A bottle opener is a device that enables the removal of metal bottle caps from bottles. More generally, it might be thought to include corkscrews used to remove cork or plastic stoppers from wine bottles. Another name for some types of bottle opener is church key.
A metal bottle cap is affixed to the rim of the neck of a bottle by being pleated or ruffled around the rim. A bottle opener is a specialised lever inserted beneath the pleated metalwork, which uses a point on the bottle cap as a fulcrum on which to pivot.
The following varieties of bottle opener are used around the world used in a professional capacity.
Invented at the same time as the crown cork it is the original "bar blade". But as well as being portable it also comes as a fixed device to be attached to vertical surfaces, often with a tray to catch the bottle tops. Again, though, it does not open wine.It is class 2 fulcrum type.
A simple opener is just a piece of metal with a rectangular or rounded opening in one end and a solid handle large enough to be gripped between the thumb and forefingers on the other. The opening contains a lip that is placed under the edge of the bottle top, pulling it off when upward force is applied to the handle end of the opener. This type of opener is small and durable, so it is frequently used as a key fob.
This common wine opener consists of a flat housing (often plastic covered) similar to a Swiss army knife with a corkscrew and lever (which doubles as crown cork opener) with either a knife or auto-foiler to remove the foil top of wine bottles and then the cork. Designed to be screwed in to within 1 full rotation before the end of the screw (more will pierce the bottom of the cork and result in extra flotsam on the surface of your wine) before levering out the cork.
A relatively new trend in opening. It is a flat blade of steel approximately 4 cm wide and 16 cm long with a thumb hole at one end and a letterbox cut at the other to remove the caps from beers and soft drinks. It has gained fashionability through widespread usage by professional bartenders in Canada, the USA, and most notably the UK. Carried in the pocket or against the body or on a zip string, it is both convenient and fast for the modern bartender. Its obvious disadvantage is that it does not remove corks.
Works the same as the lever variation, except that it is attached to the wall, to allow for simpler bottle-opening, which can be done with one hand. The bottle cap can fall into a bottle cap catcher mounted below the opener, or you can retrieve it after removal from the bottle. The most famous wall mounted bottle opener manufacturer, Brown Mfg. Company, has been producing bottle openers since 1925. A Brown Mfg. Co. bottle opener carries the trademark "STARR" at the base of the opener.
This is a shaped like a large key with a squared oval handle about 5 cm × 8 cm, and two thin metal strips, approximately 10 cm long, 5 cm wide, and 0.5 cm thick, descending in tandem from the center of the handle. The two strips are spread open and then wiggled into the space between the cork and the bottle on either side. Once fully in place, a turn and pull of the handle causes friction to turn the cork and pull it out of the bottle. "Ah-so" is a translation of the German title, "Ach so!", an expression meaning roughly "Ah, I see." It is named so because its appearance often baffles people, but when its use is demonstrated, they often exclaim "Ah! So that's how it works". The ah-so is useful in opening old bottles with brittle corks, because it does not puncture the cork, limiting the likelihood of a brittle cork crumbling into the wine. The Ah-So can also inadvertantly push the cork further into the bottle rather than extract it.