Agitating – Stirrer within stationary mixing chamber – Rotatable stirrer
Patent
1984-02-08
1986-05-27
Coe, Philip R.
Agitating
Stirrer within stationary mixing chamber
Rotatable stirrer
366331, B01F 730
Patent
active
045912734
DESCRIPTION:
BRIEF SUMMARY
The present invention provides a whisk beater which is particularly, but not exclusively, intended for beating egg white stiff.
Beaters of this type are known and in general they comprise two whisks which are made to rotate at high speed in opposite directions. In hand beaters, this rapid rotary motion of the whisks is superposed on a much slower hand motion whose purpose is to ensure that all the ingredients are beaten into a homogenous product.
The present invention relates more particularly to a whisk beater for mounting in a food processor such as that described in French Pat. No. 71 27039 in the name of Pierre Verdun. This type of processor comprises a base housing an electric motor whose shaft projects into a removable bowl and on which various tools can be received. The motor shaft rotates at high speed and some tools, such as knives with curved blades, mix ingredients inserted into the bowl in a homogenous manner. Unfortunately, this tool turns out to be unsatisfactory for beating egg white stiff.
Other food processors provide means for mounting two whisks over the bowl, with the whisks being suspended from a motor shell which includes a cantelever. In order to obtain the above-mentioned simultaneous pair of motions, it is known to cause the whisks to rotate at high speed while the bowl itself is driven at low speed. Such a device is described in U.S. Pat. No. 2,615,690 filed in the name of Jepson.
The present invention provides a whisk beater capable of being mounted on a food processor which does not include a cantelever, but which has a bowl that is closed by a lid, said beater including a mechanism which enables it to provide both of the required rotary motions.
According to the invention, the whisk beater comprises two whisks made to rotate at high speed in opposite directions and mounted in a shell which is provided with drive means, characterized in that said shell rotates at slow speed inside a fixed bowl.
To give an idea of scale, high speed may be taken to mean about 1,500 rpm and low speed about 60 rpm.
Since the shell is included inside the bowl and the drive means are located below the bowl, the mechanism will be subjected, in operation, to splashing. It is therefore important that it should be washable, preferably in a washing up machine. This means that the shell should be sealed so that washing up liquids do not get inside it. Unfortunately, because of the rotating contacts, sealing cannot be suitably provided by conventional means. The present invention provides a solution to this problem.
According to another characteristic of the present invention, since the shell is mounted on a hub which cooperates with the motor drive shaft, resilient means are interposed between the hub and the shell in such a manner as to move a collar against a sealing ring when the device is in the rest position.
Finally, since the whisks and the shell are rotatably driven inside the bowl, it is necessary for a fixed point to be available. According to another characteristic of the invention, the fixed point is provided by the shell bearing against the lid of the bowl. This characteristic has a safety advantage in that the device can thus be operated only when the lid is in a suitable position, thereby preventing fingers from being inserted during operation.
Other characteristics and advantages of the invention appear from the following description of a particular embodiment given solely by way of non-limiting example with reference to the figures, in which:
FIG. 1 is a vertical section through a whisk beater in accordance with the invention in its working position;
FIG. 2 is a view of the whisk mounting and drive means;
FIG. 3 is a diagram showing the co-operation between the beater and the lid;
FIGS. 4 and 4a are respectively a diagram showing the principle of shell drive and a section through the teeth; and
FIG. 5 is a view similar to FIG. 1, but showing the beater in the rest position.
In FIG. 1, the hub of a beater is fixed on the top end of a drive shaft A and is surrounded by a skirt B formed in the
REFERENCES:
patent: 2615690 (1952-10-01), Jepson
Gallardo Manuel A.
Meyer Jean
Coe Philip R.
O'Rourke Thomas A.
LandOfFree
Whisk beater does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Whisk beater, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Whisk beater will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1568991