Apparatus for preparing hot drinks

• US 4,550,024 A
• Filed: 01/20/1984
• Issued: 10/29/1985
• Est. Priority Date: 01/20/1983
• Status: Expired due to Fees

• Current Assignee: Douwe Egberts Koninklijke Tabaksfabriek-Koffiebranderijen-Theehandel BV
• Original Assignee: DOWE Egberts Koninklijke Tabaksfabriek-Koffiebranderijen-Theehandel NV
• Inventors: le Granse, Josephus N.
• Primary Examiner(s): Weinstein, Steven
• Application Number:
  US06/572,373
• Time in Patent Office: 648 Days
• Field of Search: 99/295, 99/304, 99/306, 426/77, 426/82, 426/79, 426/84, 426/433, 426/112, 426/115, 277/135, 220/228
• US Class Current: 426/77
• CPC Class Codes: A47J 31/02 Coffee-making machines with removable extraction cups, to be placed on top of drinking-vessels i.e. coffee-makers with removable brewing vessels, to be placed on top of beverage containers, into which hot water is poured, e.g. cafe filter filters A47J31/06
• CPC Class Codes: A47J 31/0642 specially adapted to cooperate with a cartridge, e.g. having grooves or protrusions to separate cartridge from the bottom of the brewing chamber A47J31/0668 takes precedence
• CPC Class Codes: B65D 85/8061 Filters

Abstract

Apparatus for brewing, in particular, a multiplicity of consumption units a hot drink, such as coffee. The apparatus comprises a combination of a filter pan and a disposable filter cartridge with cellulose web filters. According to the invention, the filter cartridge and the filter pan have parts cooperating to provide a circumferential seal, dimensioned so that when introduced the filter cartridge rests loosely in the filter pan without being clamped therein, and a seal is provided by means of capillary forces that occur during brewing in the gap between the cooperating parts. The filter cartridge may have an axially symmetrical body, and the parts of the filter pan and the filter cartridge co-operating to provide a seal may have a substantially equal axially symmetrical conicity.

Claims

1. Apparatus for multi-cup brewing of ground coffee comprising:

a reusable filter pan having an inwardly directed shoulder and a part in the shape of a reverse truncated cone extending donwardly from said shoulder and

a disposable filter cartridge containing ground coffee having an upper outwardly directed flange which rests loosely on said shoulder thus supporting said filter cartridge without clamping said cartridge in said pan and a part in the shape of a reverse truncated cone extending downwardly from said shoulder with an outside surface cooperating with and having substantially equal concavity as said filter pan part and slightly less radial diameter than said filter pan part the space between said parts is such that, when hot brewing water is poured into said pan and enters the space, a capillary seal is formed which prevents additional hot brewing water from thereafter bypassing said cartridge.

2. Apparatus according to claim 1 wherein the capillary gap remaining between the parts of the filter pan and the filter cartridge is 1/4-3/4 mm.

3. Apparatus according to claim 1, wherein said filter cartridge has an axially symmetrical body, and the parts of the filter pan and the filter cartridge exhibit a substantially equal axially symmetrical conicity of between 0°

and 45°

, the length of these parts ranging between 1/2 and 3 cm.

4. Apparatus according to claim 3, wherein the conicity ranges between 1°

and 10°

, and the parts have a length of 1-2 cm.

5. Apparatus according to claim 3, wherein the filter pan is of metal, and the body of the filter cartridge has such a design and is made of such synthetic plastics material that the radial diameter of the cartridge part is formed with a tolerance not exceeding 0.2 mm.