Agitating – By movement of mixing chamber relative to stationary support
Patent
1993-04-19
1994-10-04
Jenkins, Robert W.
Agitating
By movement of mixing chamber relative to stationary support
366602, 494 33, B01F 900
Patent
active
053520378
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a mixing bowl for planetary centrifugal mixers, and to a planetary centrifugal mixer receiving such bowls.
Planetary centrifugal mixers are known, for example through Patent Application DE-A-2,209,850 and Patent Application EP-A-207,335, intended for example for the preparation of mixtures used in dentistry, particularly alginate-based pastes for taking dental impressions and comprising at least one arm mounted movable in rotation about a vertical axis, means provided on the said arm so as to permit the mounting of a bowl movable in rotation about an axis sloping with respect to the axis of rotation of the arm, and driving and planetary transmission means for simultaneously causing the arm to turn about its vertical axis of rotation and the bowl about its axis of rotation sloping with respect to the vertical. The bowls provided on these known mixers are bowls of revolution comprising a bottom and a peripheral lateral wall of cylindrical general shape. However, the mixing effect to which the products to be mixed are subjected in such bowls often proves not to be optimal, in view, among other things, of the consistency of the products to be mixed and of the effect of adherence of these products to the bowls.
In order to improve this mixing effect, it has already been proposed through Patent Application DE-A-2,001,301 to give such mixing bowls an internal shape which is not of revolution. According to FIGS. 17 and 18 of this document, the internal space of a mixing bowl of cylindrical external configuration has the shape of a transverse slit defined by two parallel flat walls and by two semi-circular end walls.
Such a bowl proves not to give satisfaction because an excessive unbalance is produced, when the bowl rotates, owing to the shape of the latter and to the irregular movement which the products to be mixed undergo in the bowl.
Moreover, another disadvantage of the known mixing bowls consists in the difficulties in extracting the mixed product from the bowl. This extraction is generally effected with the aid of a spatula which it is necessary to pass several times into the bowl so as to remove therefrom the whole of the contents.
Furthermore, the known bowls, when they are light, that is to say with a thin peripheral lateral wall, undergo during mixing deformations under the effect of the centrifugal force.
Another problem relating to the known bowls concerns the closure of these bowls with the aid of a detachable lid fitted onto or into the bowl. If this closure is hermetic, in order to protect the contents of the bowl from the ambient air, a partial vacuum (suction cup effect) is produced inside the bowl when the lid is removed. In order to remedy this suction cup effect, it has already been proposed to pierce a small hole in the lid, but in this case the bowl and its lid do not constitute a hermetic enclosure and, moreover, when the lid is removed, an air intake is produced through the hole, inducing a jet of air which results, when the products contained in the bowl are in powder form, in a portion of these products being blown out of the bowl at the moment when the lid is removed.
In a general way, the known centrifugal planetary mixers of the type defined above have moreover the disadvantage of a high cost owing to the complicated structure of the mixer as a whole and in particular of the means for supporting the rotary arm and of the means for supporting the mixing bowl on the rotary arm. In fact, these support means generally comprise a rotary shaft for the arm as well as a rotary shaft for a bowl-carrier, which involves the use of bearings (rolling bearings) for mounting these shafts. Moreover, the holding of the bowls on these mixers is often unsatisfactory.
The present invention has as its subject a mixing bowl for a planetary centrifugal mixer, this bowl ensuring an effective mixing while facilitating the removal of the mixed products from the bowl. The invention also has as its subject a mixing bowl with lid, preventing any deformation of the bowl during mixi
REFERENCES:
patent: 3778033 (1973-12-01), Pullman
patent: 4586292 (1986-05-01), Carroll
patent: 4728197 (1988-03-01), Reinhard
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