Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-12-22
2001-04-24
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S07500D, C123S1490FA, C074S440000
Reexamination Certificate
active
06222292
ABSTRACT:
FIELD OF THE INVENTION
This invention relates in general to magnetically driven pump assemblies and more specifically to a device that facilitates attachment of multiple outer drive magnet assemblies to a given motor shaft.
BACKGROUND OF THE INVENTION
Magnetically driven fluid pump manufacturers supply outer drive magnet assemblies that are mounted or attached to the output shaft of an electric motor. The outer drive magnet assembly is typically disposed on the motor output shaft and held in place using a shaft key and a set screw. The outer drive magnet assembly rotates with the motor output shaft. The outer drive magnet assembly of several manufacturers are one-piece assemblies. Manufacturers of such devices include Ansimag Inc. of Elk Grove, Ill.
Outer drive magnet assembly characteristics vary in accordance with required magnet strength, horsepower (hp) requirements of the pump, RPM (revolutions per minute) of the motor and the bore and keyway dimensions of the motor output shaft. The same outer drive magnet assembly can be used with several horsepower and RPM ranges. For example, the same magnet assembly can be used for 1 hp through 5 hp pumps operating at 3500 RPM. A different magnet assembly may be used for 7.5 hp through 15 hp at 3500 RPM. The internal bore and keyway dimensions of the shaft to which the magnet assembly is attached are the only differences in the outer drive magnet mechanisms for several horsepower and RPM ranges. Manufacturers currently address this difference by fabricating completely different outer drive magnet assemblies for each different motor shaft diameter. The outer drive magnet mechanism is quite costly relative to the total cost of the pump. The added cost is passed on to distributors and end users of the outer drive magnet mechanism. The outer drive magnet mechanism is costly to manufacture, expensive to maintain as an inventory item (for manufacturers, distributors and end users) and occupies valuable inventory shelf space.
There is a need for an adapter mechanism to make the outer drive magnet assemblies more versatile in their application. Creating added versatility in the application of outer drive magnet assemblies can reduce manufacturing overhead costs and thus reduce purchasing and inventory costs to manufacturers, distributors and end users. End users would benefit in that they would only be required to stock the largest bore diameter outer drive magnet assembly for each pump/horsepower/RPM range, along with the appropriate adapter, thereby reducing inventory costs and adding flexibility and convenience in replacing outer drive magnet assemblies.
SUMMARY OF THE INVENTION
A shaft adapter for use with an outer drive magnet assembly having an internal bore adapted to receive the output shaft of a motor, according to one aspect of the present invention, comprises a cylindrical member having an axially aligned cylindrical aperture therein adapted to receive the output shaft of the motor, and wherein the cylindrical member has an outer diameter sized to correspond with the internal bore of the outer drive magnet assembly, means for positively engaging the output shaft of the motor disposed within the cylindrical aperture and attached to the cylindrical member, and means for positively engaging the outer drive magnet assembly attached to the cylindrical member.
One object of the present invention is to provide a more economical mechanism for attaching a variety of outer drive magnet assemblies to motor shafts.
Another object of the present invention is to eliminate the need to maintain inventory of a variety of outer drive magnet assemblies if the supplier thereof produces the magnet assemblies in a multitude of sizes yet the user desire to use a standard motor to drive all the magnet assemblies.
These and other objects of the present invention will become more apparent from the following description of the preferred embodiment.
REFERENCES:
patent: 4066048 (1978-01-01), Premus
patent: 4285305 (1981-08-01), Kaufman et al.
patent: 5729886 (1998-03-01), Olson et al.
Brant Kyle
Lam Thanh
Ramirez Nestor
LandOfFree
Magnetic drive adapter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic drive adapter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic drive adapter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2450464