Knockbox

Knockbox is a device used in espresso preparation for the disposal of spent coffee grounds. It is a common tool in both commercial and home espresso-making setups. The purpose of the knockbox, also known as a bash bin or coffee knock out box, is to provide a convenient means of disposing of the coffee puck, the compacted cake of coffee left in the machine's portafilter after an espresso has been pulled.

Design and Use

A typical knockbox consists of a sturdy box or container, often made of stainless steel, plastic, or wood, with a crossbar or knock bar across the top. The knock bar is usually covered with a material that is both durable and shock-absorbent, such as rubber, to withstand the repeated impacts of the portafilter.

To use the knockbox, the barista takes the portafilter, containing the spent coffee puck, and strikes it against the knock bar. The impact dislodges the puck, which falls into the box. The knockbox is designed to be easy to clean, with the knock bar often being removable for this purpose.

History

The knockbox is a relatively recent addition to the espresso-making process, reflecting the increasing popularity of espresso drinks and the need for efficient disposal of spent coffee grounds. While there is no definitive date for the invention of the knockbox, it has become a standard piece of equipment in coffee shops and espresso bars around the world.

See Also

• Espresso machine
• Coffee grinder
• Barista