Food processor comprising a mixing vessel and a drive mechanism

Details Food processor comprising a mixing vessel and a drive mechanism Food processor comprising a mixing vessel and a drive mechanism

1997-01-27

1998-06-23

Simone, Timothy F.

Foods and beverages: apparatus

Cooking

With stirring

99510, 366144, 366146, 366314, 366601, A21B 100, A47J 2900, A47J 4304, A47J 4307

Patent

active

057689784

DESCRIPTION:

BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION

The invention relates to a food processor comprising a mixing vessel and a drive mechanism for an agitator in the mixing vessel, wherein the mixing vessel may be heated in its lower region and may be held in a narrowly enclosing seat which has a substantially cylindrical wall region.
A food processor formed in such a manner is known from DE-OS 35 07 276. Here there is shown a mixing vessel, which is conically formed in its lower region in such a way that this region tapers downwardly. A mounting of the mixing vessel is effected in a seat in the device, which seat has a correspondingly conically-formed wall region. This seat is manufactured of aluminium and frictionally receives the mixing vessel manufactured of stainless steel sheet. Concentrically with the seat, there is provided on the underside of the seat a heating plate ring surface likewise comprised of aluminium. The seat transfers the heat absorbed by the heating plate ring surface via the surface exerting the frictional connection to the mixing vessel and therefore to the medium disposed in the mixing vessel. Further food processors are known in which the seat is PTFE-coated, to simplify a placement and release of pot and seat. It has proven that because of the different materials--mixing vessel of stainless steel and seat or heater of aluminium--at like temperature of heater/seat and mixing vessel, the heater/seat expands more than the mixing vessel and therefore an air gap may develop between the mixing vessel and the seat or the heater. By this, the frictional mounting is diminished, as a consequence of which there results an impaired heat transfer. In addition, it arises, in mixing vessels which have a vertical stop face, that this stop face loses the heat-conducting contact with the heater. But if the pot does not have a vertical stop face, there then results, after the heater is switched on, a sliding down of the mixing vessel deeper into the seat or heater. Consequently, there may result a jamming after cooling of the heater/seat and the mixing pot, because the heater or the seat shrinks to a greater extent than the mixing pot in its floor region. Even the cone, which converts a portion of the radial shrinkage forces into axial disengaging forces, and an optional PTFE-coating with low coefficient of friction, effect no upward movement of the mixing vessel. Furthermore, food residues or the like may get into the gap formed by the different thermal expansion coefficients of mixing vessel and heater/seat. These food residues or the like may lead, during the heating operation, in a permanent baking between the seat and the mixing vessel. After that, a removal of the mixing vessel may be effected only by relatively high exercise of force.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide a food processor of this type improved so that there is always uniform heat transfer and a removal of the mixing vessel may be effected without great exercise of force after the food processor has been used.
As a result of such an arrangement, there is provided a food processor of this type in which there is always provided a uniform transmission of heat between the seat and the mixing vessel, irrespective of the level of the heating temperature. Furthermore, during operation, there is always provided a frictional retention. After use of the food processor, the frictional connection is relieved, by virtue of which the mixing vessel may be easily removed from the food processor. This is solved in that the cylindrical wall region may be changed with regard to its diameter, for frictional holding of the mixing vessel. To put the food processor into operation, the mixing vessel is seated in the processor, with the seat wall enclosing the lower region of the mixing vessel. After this, there is effected a change in the diameter of the cylindrical wall region of the seat, to the effect that there is achieved a reduction of the diameter for frictional clamping around the lower mixing-vessel region. The

REFERENCES:
patent: 4779522 (1988-10-01), Wong
patent: 5013158 (1991-05-01), Tarlow
patent: 5031518 (1991-07-01), Bordes
patent: 5228381 (1993-07-01), Virgilio et al.
patent: 5363746 (1994-11-01), Gordon
patent: 5605090 (1997-02-01), Mantani et al.

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