Agitating – Stirrer within stationary mixing chamber – Rotatable stirrer
Reexamination Certificate
1999-03-25
2001-05-08
Cooley, Charles E. (Department: 1723)
Agitating
Stirrer within stationary mixing chamber
Rotatable stirrer
C366S065000
Reexamination Certificate
active
06227697
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a mixer comprising a mixing vat, a mixer rotor rotatable around an essentially vertical axis of rotation by means of a motor, a first mixing tool mounted on the mixer rotor which rotates around a first axis, and an additional mixing tool mounted the mixer rotor, wherein the mixing tools extend down from above into the mixing vat.
A mixer of this type is known from German Patent No. DE 4,212,937, which is constructed as a pan mixer and which has a rotor that is operable by means of a drive motor connected to it by a set of gears. The rotor contains several mixing tools which extend down from above into the mixing vat. At least one mixing tool of the mixer rotor is rotated around an axis of the mixing tool by means of an additional set of gears located on the mixer rotor. A different mixing tool, one for instance designed as a paddle, is mounted on the mixer rotor, advantageously by means of resilient mounts, in such a way as to only turn on the rotational axis of the mixer rotor in the mixing vat.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved mixer.
Another object of the invention is to provide a mixer which can be constructed at low cost and yet optimize the thorough mixing of the substances being mixed.
A further object of the invention is to provide a mixer which assures both economical operation and quick, even mixing of the mixed substance.
It is also an object of the invention to provide a mixer which is very safe to operate and easy to access and service.
These and other objects are achieved in accordance with the present invention by providing a mixer comprising a mixing vat, a mixer rotor rotatable by means of a drive motor around an essentially vertical axis of rotation, a first mixing tool mounted on the mixer rotor which rotates around a first axis, and at least one additional mixing tool mounted on the mixing rotor, wherein the mixing tools extend from above down into the mixing vat, the mixer rotor contains a set of gears by which the first mixing tool and a second rotatable mixing tool are coupled so that the rotational speed of the second mixing tool is greater than the rotational speed of the first mixing tool by a prescribed factor.
The mixer according to the invention is distinguished from others through its functional construction and assures a quick and even mixing of the mixed substance. The mixer contains two mixing tools, which turn about their axes of rotation with different rates of rotation and are linked by means of a common set of gears. Thus, one of the mixing tools can be designed as a mixing star while the other mixing tool is designed as a swirler, the speed of which is greater by a predetermined factor than that of the aforementioned first mixing tool or mixing star. A motor for driving the mixer rotor, in particular an electric motor, is provided, and the set of gears of the two rotatable mixing tools which is located on the mixer rotor is also powered by this motor. The set of gears is optimally located in the middle of the mixer rotor so as to leave hollow spaces on both sides, and in at least one of these hollow spaces is located the preferably resilient mount for a mixing tool which is rotatable only together with the mixer rotor around its axis of rotation. The mixer rotor has a housing which is essentially rotationally symmetrical and/or cylindrical, which housing assures an encapsulation or enclosure of the set of gears located within it as well as of the mount, particularly a resilient arm mount, for the additional mixing tool. Penetration of mixed substance, dirt or the like into the interior of the mixer rotor is thus avoided in a particularly advantageous manner. The hollow space containing the preferably resilient mount of the additional mixing tool is easily accessible, if necessary, by opening the housing, and thus it is possible to carry out maintenance and servicing measures with ease. Preferably, the mixer rotor is rotatably mounted on the underside of a support frame preferably by means of a large roller bearing, while the drive motor is disposed on the upper side of the mounting frame, and a motor shaft extends from the drive motor through the mounting frame down to the mixer rotor.
Refinements and specific embodiments of the invention are described in the remainder of the specification.
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Cooley Charles E.
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
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