A well-designed corkscrew will utilise the use of a screw and the rack and pinion to extract the cork from a bottle. The corkscrew's handles, which end in pinions, generate a considerable force and leverage on the rack. This enables the cork to be extracted without having to extract the screw component which is embedded within the cork.
After the screw has been fully inserted, the handles are then pushed downwards. This action forces the pinions up the rack, and at the same time pulls the cork from the bottle, this process is a demonstration of the scientific phenomenon of levers in use.
The electric corkscrew operates on similiar principles but in this case an electric motor is used which first screws the screw into the cork and then extracts the cork all in a single operation.
