Agitating – Stirrer within stationary mixing chamber – Rotatable stirrer
Reexamination Certificate
2000-04-17
2001-09-11
Cooley, Charles E. (Department: 1723)
Agitating
Stirrer within stationary mixing chamber
Rotatable stirrer
Reexamination Certificate
active
06286990
ABSTRACT:
PURPOSE OF THE INVENTION
This present invention refers to a stirring device which has been specially conceived to be attached to kitchen vessels such as pots, saucepans and the like, with the advantage that the stirrer may be adapted to vessels which are substantially different both in size and in height.
The stirrer is especially useful for cooking soups, purees, sauces and, in general, liquid or pasty products which require slow and continuous stirring throughout their cooking process.
BACKGROUND OF THE INVENTION
It is well known that there is an infinite number of kitchen recipes in which, for the best results, it is necessary to stir the product slowly while it is being cooked.
This task of stirring is very wearisome for the cook, and can even be very tiring in the case of products of a certain density, or which must be stirred relatively quickly.
The obvious solution to this problem would consist of using a duly mechanized stirrer which would turn at the correct speed and have blades to stir the product.
However, this apparently very easy solution faces practical problems deriving from the inevitable fact that in any kitchen there is a large number of vessels of different sizes which must also be used specifically at certain times, precisely because of their size, because of the amount or the nature of the product being prepared.
Therefore, it would be necessary to have a different stirrer for each size of kitchen vessel, thus implying a practical complexity which would make this solution completely non-viable.
Other solutions have been proposed by the Patents U.S. Pat. No. 5,613,425 and U.S. 4,184,779 but these patents offered a lot of difficulties in the manufacture that have been solved by the present invention.
SUMMARY OF THE INVENTION
The stirrer proposed in this invention resolves the above problem in a perfectly satisfactory manner, by permitting it to be adapted to any size of kitchen vessel, of whatever diameter or effective height.
The stirrer described here is made up of a support base for a motor reducer group, fixed to said base, The base, fits centrally on the mouth of any kitchen vessel, has articulated arms, the radial disposition of which makes it possible for their free ends to be contained within an imaginary circle of greater diameter than that of the mouth of the largest kitchen vessel foreseen for the purpose, so that a greater or lesser degree of oscillation of these arms means that their effective length will adapt to the diameter of any kitchen vessel.
Likewise, in order to ensure that the imaginary axle of the support base is always in the center of the mouth of the vessel, the inside, or articulated end, of the arms contains a gearing, by means of which they are related to a common center, also geared, which determines a perfectly synchronized oscillation movement for each of the arms, which have at their free end a clamp, of any appropriate conventional type, to attach them to the mouth of the kitchen vessel.
Said support base receives, preferably by means of a bayonet attachment system, an upper part containing said motor reducer group, assisted by an electric circuit with a speed selector, allowing the device to work at two or more speeds, thus adapting the work speed to the type of product being prepared, a switch to set it going and a timer to control at will the duration of the operative cycle, also on the basis of the type of product being prepared.
The motor may be supplied either by rechargeable batteries inside an operative housing fixed to the same body containing the motor reducer, or directly from a main, in which case, instead of the batteries, there will be a rectifier circuit to transform the alternating current of the main into direct current appropriate for the motor reducer.
In any case, from the bottom end of said body there emerges a short motor axle, which is keyed to a considerably longer axle, conveniently associated to the support base, which by mans of another key, is attached telescopically to the shaft bearing the moving blades. This shaft has at least two transverse baffles, at a substantial distance from each other, with holes to attach to the axle, so that the distance between these baffles ensures the permanent vertical position of the shaft, which ends in a lower cross-piece to the symmetrical, free ends of which the stirring arms themselves are attached, adopting a bent position in order to act both on the base and on the sides of the kitchen vessel. The length of the lower or horizontal arm is such that, together with the other arm placed in the intermediate cross piece, it is always greater than the maximum diameter of the kitchen vessel, so that the stirring arms themselves form variable angles as regards the intermediate cross piece, almost 180° C. as the vessel gets wider, although never actually attaining this maximum mark.
The telescopic nature through which the axis joined to the support base is related to the central shaft of the stirring arms, allows these arms to always adapt to the bottom of the vessel, as well as to its sides, whatever its depth.
REFERENCES:
patent: 723977 (1903-03-01), Barney
patent: 3011768 (1961-12-01), Clark
patent: 3357685 (1967-12-01), Stephens
patent: 4184779 (1980-01-01), Detmer
patent: 4832501 (1989-05-01), McCauley
patent: 4921356 (1990-05-01), Bordenga
patent: 5013158 (1991-05-01), Tarlow
patent: 5372422 (1994-12-01), Dubroy
patent: 5516208 (1996-05-01), Givant
patent: 5613425 (1997-03-01), Krznaric
patent: 5676464 (1997-10-01), Mattar
patent: 5711602 (1998-01-01), Rohring et al.
patent: 5816136 (1998-10-01), Stallings
patent: 5863121 (1999-01-01), Dunk
Cooley Charles E.
Ladas & Parry
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