Infusion Coffee Maker
Infusion Coffee Maker
© Denzil Green
An Infusion Coffee Maker has two main parts to it, a carafe and a plunger.
The coffee gets "filtered", but without any paper to absorb some of the flavour oils away from the coffee, this method allows for more oils and suspended flavour particles in the coffee. It makes a denser coffee with more substance. Some people like the ceremony involved, which is a bit more elaborate than pressing a button on an electric drip-machine.
The plunger is a disk (sometimes referred to as a screen) attached to the bottom of metal rod that, at the top, has a knob on it. The metal rod goes through the centre of a lid, and has the disk at one end underneath the lid; the knob at the other end on top of the lid. The disk is a metal frame with a mesh screen cover on it. The mesh may be nylon or stainless steel; stainless steel lasts longer. The disk fits snugly into the carafe, so that as you push the plunger down, there's no space on the sides for coffee grounds to escape upwards along the sides. As you press the plunger down, the ground coffee gets trapped underneath the plunger, and driven down to the bottom of the coffee pot.
The carafe can be metal, plastic or glass, but is usually glass. It is shaped like a tall cylinder, with a pouring spout at the top front. Glass carafes sit in a metal frame, with a handle attached to the back, Glass carafes are very fragile -- many meet untimely ends by being vibrated off their resting places on top of fridges, or accidentally being brushed off a counter, leaving you with your plunger and stylish but now useless frame. They certainly aren't something you're going to want to take camping with it. Stainless steel carafes have the advantage of being unbreakable, and are usually insulated -- but the disadvantage is that you can't "see" how the coffee is coming along inside as you are brewing it.
Carafes come in different volumes, from personal to dinner-party size. A carafe won't hold the amount of water that it seems to say it will. One that says, for instance, that it holds 32 oz of water, may just hold 28 oz of water once you have the ground coffee in it as well.
You boil the water outside the pot, either in a kettle (electric or stovetop), or in an ordinary pot on the stove
It is best to warm the carafe, with the plunger in it, first with boiling water in it for 1 to 2 minutes. Then empty out the warming water, measure in the coffee, and pour in fresh hot water. Ideally, the water should be just a bit below the boiling point -- 195 to 205 F (90 to 96 C.) But admittedly, with all our electric kettles designed to tell us when the water has actually reached the boiling point, it's hard to know when it's less than that.
Some people like to stir it at this point before proceeding. Now, put the plunger in place, lid on, but only push the plunger down after the steeping time. Let coffee steep for 3 to 5 minutes, then push the plunger down slowly. If the plunger seems to get stuck and won't go any further without a lot of force, pull it back up again a little ways, then try again. If the plunger just won't go any further say than halfway down, you have either put in an insane amount of ground coffee, or have used coffee ground far too finely. When you press the plunger down when the jug has no coffee in it, the knob of the handle will come right down to the lid. When it has coffee in it, don't expect it to, or try to make it to -- it can't, because the ground coffee is occupying space at the bottom of the jug.
For an average person's taste, use 2 tablespoons of ground coffee per 6 oz (175 ml) of water. The coffee should be medium grind, similar to that for a drip machine, or medium-coarse.
You can now get electric ones. The coffee carafe itself is cordless, but it sits on a base that gets plugged in the wall. To use it, you fill the carafe with water, put it on the base, and turn it on, which causes the water to boil. Then when the water has boiled, you add your coffee, plunge and continue as usual.
Coffee won't stay warm long in a French Press. You can buy fabric covers which operate along the same principle as tea cozies designed to wrap around the sides, usually fastened with velcro, If you have one, put it on just before you pour the brewing water in, so that you are conserving the heat right from the start. If you don't, you may wish to consider transferring it as soon as it is done into a heated thermos coffee pot. This will both keep the coffee warm, and get it away from the coffee grounds, which cause it to keep on steeping to the point eventually of bitterness. Many advise to pour it even out of the insulated stainless steel ones once brewed.
If you want coffee to last the morning, you can go one of two ways:
- pour it into a heated thermal carafe
- get a personal size one, and make a cup at a time as you want it. And look on the bright side: the ceremony involved in making 1 cup will help to stretch out your coffee break (in theory.)
Stray bits of ground coffee can enter the coffee now and then. In fact, every cup of coffee will probably always have a bit of sediment settling in the bottom of it.
A popular brand name is "Bodum."
The coffee makers were made slowly throughout the second half of the 1800s, mainly of metal. The persistent problem was grounds escaping up around the edges of the metal screen.
Improvements happened slowly, starting in the 1930s. Attilio Calimani  and Giulio Moneta (living at 34 Via Piolti de Bianchi in Milano) and Giulio Moneta (living at 20 Via San Vincenzo in Milano) filed requests for an improvement in screen in 1929 in Denmark (filed 27 March 1929) and in America (2 April 1929). They were granted Danish Patent Number DK43444C on 1 December 1930; US Patent Number 1,797,672 on 24 March 1931 (filed as "Ugo Paolini, of Milan, Italy, Assignor of one-half to Attilio Calimani and one-half to Giulio Moneta"); Dutch Patent Number NL27332C on 15 August 1932; and UK Patent Number GB395548 on 20 July 1933. Here is their description of their improvement from their UK request filed on 13 October 1932:
[a plunger] "characterized by the feature that the piston-like filter is provided around its periphery with resiliently deformable seaing means, such as one or more split rings of any form, a helical coiled spring or the like, or a solid or hollow rubber ring or the like, which prevent liquid from leaking past the periphery of the filter and permit the filter to be pressed down by a moderate amount of force..."
A patent for the design of a plunger closer to that used today was awarded in 1936 to "Bruno Cassol", Milan, assignor to Gemma Barelli Moneta, Milan, Italy (the patent says that the application was filed in America on 26 February 1935, in Italy on 2 March 1934. US patent number 2,053,021 received on 1 September 1936,) Cassol's invention was a plunger that hugged the size of the jug, ensuring that the coffee grounds stayed below.
Fallero Bondanini (of Lausanne, Switzerland) was granted US patent number 2,900,896 on 25 August 1959 for improving upon Cassol's design. He said in his filing request, "It is seen in Fig. 3 that the filter (6) has a turned up edge (6c) which assumes the form of the wall (8d) in order to dispose itself between this wall and the inner surface (2b) of the pot..... frame comprising two sheet metal disks formed with open work to define said perforations, one of said disks defining a dish-shaped until and said filter being mounted between said disks..."
Bodum started dominating the market outside the UK in the late 1970s with their sophisticated designs.
 In 1931, Attilio (and Giuseppe Campana of Milan, Italy) also received American patent 1,819,226 on 18 August 1931 for a metal milk jug for boiling milk in. It had a broad, flat rim around it, to prevent milk from boiling over (and UK patent number GB341764 on 22 January 1931 for the same device). This was for heating milk in for caffe latte, etc.
Literature & Lore
In the preferred embodiment of the invention, the resilient packing member for obtaining efficient tightness, comprises a helical spring peripherally secured to the filter. The filter may be built up of two flat discs each, provided with perforations and pressed together by a screw-threaded spindle. One of the discs has an upstanding peripheral edge pierced with holes, in which engage the coils of the spring, the spring portion in contact with the inner surface of the vessel being suitably covered. This covering may be effected by bending the projecting edge of the filtering gauze which is secured between the two discs. As the flexible packing of this embodiment adheres to the inner surface of the vessel at all points, a radial expansion of the elements always occurs thus holding them during reciprocation in contact with the inner surface of the vessel and in this manner an effective tightening of the vessel is obtained between the packing and the inner surface of the vessel.
-- US patent number 2,053,021. 1 September 1936. (awarded to "Bruno Cassol", Milan, assignor to Gemma Barelli Moneta, Milan, Italy.)
In the 1960s, Infusion Coffee Makers were introduced into the UK by the Household Articles Ltd company. They called their version "La cafetière", They were still making it under that brand name as of 2006.
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