Automatic device for heating and frothing a liquid, in particular milk

• US 6,840,163 B2
• Filed: 06/19/2001
• Issued: 01/11/2005
• Est. Priority Date: 06/23/2000
• Status: Expired due to Term

• Current Assignee: Rancilio Macchine Per Caffe' S.p.A.
• Original Assignee: Rancilio Macchine Per Caffe' S.p.A.
• Inventors: Oldani, Renzo, Bottelli, Eliano
• Primary Examiner(s): Simone, Timothy F.
• Application Number:
  US10/312,367
• Publication Number:
  US 20040107843A1
• Time in Patent Office: 1,302 Days
• Field of Search: 99452-455, 99275-279, 99293-295, 992/91, 992/89.R, 99284-286, 993/00, 993/02.R, 993231-3233, 261/78.1, 261/DIG.16, 261/DIG.76, 261/121.1, 261/126, 366/101, 366/163.1, 366/163.2, 366/167.1, 426/477, 426/523
• US Class Current: 99/453
• CPC Class Codes: A47J 31/4485 Nozzles dispensing heated and foamed milk, i.e. milk is sucked from a milk container, heated and foamed inside the device, and subsequently dispensed from the nozzle
• CPC Class Codes: A47J 31/4489 Steam nozzles, e.g. for introducing into a milk container to heat and foam milk
• CPC Class Codes: A47J 36/34 Supports for cooking-vessels
• CPC Class Codes: A47J 43/125 Receptacles with gas-introducing means at the bottom; Gas pumping means therefor

Abstract

An automatic device for heating and frothing a liquid, in particular milk, comprises a container (1) for the liquid, inside which a first tube (6) for introducing pressurised steam into the liquid is removably mounted. The first tube (6) has an inlet in correspondence of the bottom of the container (1), for receiving steam from a duct located within a support base (3) of the container (1), and is secured, for at least part of its length, to a second tube (7) for introducing air into the liquid.

Claims

1. An automatic device for heating and frothing a liquid, comprising a container having a bottom to which a first tube for introducing pressurized steam into the liquid is removably connected, said container being mounted on a support base where a duct for feeding steam is provided to supply said first tube with steam produced by a source, so that steam enters said first tube from the bottom, characterized in that said first tube is open and has a first end, which is arranged in correspondence of the bottom of the container inside the container, and is connected with said duct for feeding steam, and has a second end which is closed and is substantially adjacent to the bottom of the container, a radial opening being provided near said second end for letting steam pass from said first tube directly to the liquid surrounding said radial opening.

2. A device according to claim 1, characterized in that said first tube is removably connected to a fastening member secured to the bottom of the container and having an axial through-hole intended to receive said first end of the first tube.

3. A device according to claim 2, characterized in that said first tube comprises at least a first section, secured to said fastening member and having axis substantially parallel with the axis at the container, and an end section, also with axis substantially parallel with the axis of the container, comprising said second end and said radial opening and arranged adjacent to an internal wall of the container.

4. A device according to claim 3, characterized in that said first tube further comprises a substantially rectilinear and downward inclined intermediate section.

5. A device according to claim 1, characterized in that said first tube is associated with a second tube for introducing air into the liquid, which second tube is open at both ends, is arranged within the container, is secured to the first tube and is removable jointly therewith from the container.

6. A device according to claim 5, characterized in that said second tube comprises a first section, substantially parallel with said intermediate section of the first tube, and a second section, substantially parallel with the end section of the first tube and having an end portion of reduced cross-sectional size, which has an air outlet opening arranged in front of said radial opening of the first tube so as to partly obstruct such opening.

7. A device according to claim 2, characterized in that said fastening member has an outward projecting portion arranged to sealingly engage a cavity of said base, an outlet of said duct for feeding steam provided on the bottom of said cavity, in register with said axial through-hole of said fastening member.

8. A device according to claim 1, characterized in that said container has, an external surface, a plurality of tongues arranged to engage a plurality of openings in said base, adapted to be retained upon a rotation of the container about its axis, by a plurality of members on an upper surface of the base wherein said members define said openings.

9. A device according to claim 1, characterized in that said container has an external wall, having a plurality of projections arranged to engage, upon a rotation of the container about its axis, a plurality of members projecting upwardly from the base, further secured by a plurality of horizontal sections of said retaining members.

10. A device according to claim 9, characterized in that said base has a set of freely rotatable ball supports upon which the container rests when placed on the base.

11. A device according to claim 10, characterized in that said ball supports are resiliently supported within the base.

12. A device according to claim 10 or 11, characterized in that one of said ball supports co-operates with a safety switch located inside the base so as to keep said switch open when said projections are not retained by the retaining members.

13. A device according to claim 2, characterized in that said base has a central projection housing an end portion of said duct for feeding steam, said projection being arranged to sealingly engage a cavity in the bottom of said container so that an outlet of the duct for feeding steam is in register with an inlet of said first tube.

14. A device according to claim 13, characterized in that said cavity is an axial cavity of said fastening member.

15. A device according to claim 1, characterized in that said base has an on/off switch and a control knob for controlling the steam flow in said duct for feeding steam.

16. A device according to claim 15, characterized in that said on/off switch and said control knob for controlling the steam flow are carried by a control panel mounted on a vertical stem projecting from the base.

17. A device according to claim 1, characterized in that said duct for feeding steam is connected with a source of pressurized steam internal to said base.

18. A device according to claim 1, characterized in that said duct for feeding steam is connected with a source of pressurized steam external to said base, in particular with the source of pressurized steam of an espresso coffee machine.

19. A device according to claim 1, characterized in that said liquid is milk to be heated and frothed for the preparation of cappuccinos.