To perform a grinding by percussion, two elements are required: a fixed element in the shape of a bowl, called mortar and a mobile element called pestle.
Mortar and pestle have been used since ancient times by apothecaries and pharmacy preparers to pound various products of the pharmacopoeia for pharmaceutical preparations.
Known in the Maghreb and the Middle East, this small circular stone mill, for domestic use was widely used for grinding seeds, including coffee beans.
The use of the stone wheel is inseparable from human history, its use remained constant until the end of the nineteenth century,
The metate is a dormant stone wheel, used for home use, which was used to grind corn.
The upper part, called wheel or mano, generally greater than the width of the grinding wheel, seized with both hands and actuated in a reciprocating rectilinear motion.
The mill of Olynthe (named after the city of Olynthe in Greece which was destroyed in - 348 BC),represents a real technical change.
In the olynthian mill, the lower grinding wheel (4) is of rectangular type, placed on a table (5) The grinder, which constitutes the upper grinding wheel (3), is usually rectangular in shape, sometimes oval, and has in its center a parallel hopper with long sides and intended to receive the grain to grind.
This mill is surmounted by a horizontal axis (2) fixed on one side on the table to a pivot (1), the other end being actuated in a movement back and forth horizontal of the lever (2).
The Olynthe mill has a start of mechanization, the user is now standing and the work is facilitated.
This is the traditional hand-coffee grinder.
The coffee mill has a grinding chamber, comprising two grinding members.
First made for grinding spices, they will be quickly adopted to grind coffee, after some improvements (adapted grinders, adding a drawer, etc. ..)
Certainly the best grinding system, for the coffee bean.
Price sometimes high, but as with the manual mechanical mill, the grains are crushed between grinding wheels. The conical wheels grind the grains with precise uniformity while preserving the full aroma of the coffee.
The first coffee-grinder patent in the United States was issued to Thomas Bruff, Sr., in 1798.
"... This invention relates to certain new and useful improvements in coffee mills of that class wich are designed to be affixed in any desired position upon a wall or other support, and it has for its object among others to provide a simple, cheap, yet convenient mill, which has for use in connection therewith a pivoted receptacle for catching the ground coffee as it comes from the mill, the said receptacle being graduated and supported upon a pivoted part so mounted as to throw the preponderance of weight toward the support so as to prevent accidental tipping of the receptacle to the front, ..."
An electric motor driven coffee grinder is turned on by manually activating an on/off/start switch when a bag is in position to receive ground coffee under a discharge chute and automatically turned off when the bag is removed.
The grinder motor is controlled by both the manual on/off/start switch and by a switch which is actuated by a pivotally mounted lever responsive to the presence and absence of a bag under the discharge chute.
This lever is designed to assume a switch-off position when no bag is present and is pivoted to a switch-on position when a bag is present.
Website created by AICMC members - © AICMC 2012 - All rights reserved
Reproduction is prohibited without the written permission of AICMC
The association is absolutely not involved in commercial transactions between collectors.
The association is only interested in the heritage value of objects.
Note : we do not offer a valuation service
Use the Contact Us page to send us the request form with questions you may have