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US 4,071,789 AGranted
Multi-purpose kitchen appliance
AssigneeOster Corporation
InventorsPeter Jacob Ernster, William Joseph Collins, George Henry Schaefer
Life of this patent
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AssigneeOster Corporation
InventorsPeter Jacob Ernster, William Joseph Collins, George Henry Schaefer
Estimating the term…
A multi-purpose kitchen appliance for performing the functions of food mixing, blending, and the grinding or chopping of food. A power unit includes a low speed and a high speed power delivery shaft at the upper end thereon which are connectable alternatively to a blender vessel or a transversely extending head including gearing to drive a pair of food mixing elements. The head for driving the mixing elements is provided with means for detachably supporting and driving other attachments such as a food grinder. The power unit rests on a base having a laterally extending portion which has a turntable supporting a bowl into which the food mixing elements extend when the transversely extending head is positioned for food mixing. The transverse head is mountable on the power unit in alternate positions so that by connecting the food grinder to the gear train in the head, the chopped food or meat may be delivered to the bowl position on the turntable. The head is provided with means to pivotally connect it to the power unit or to rigidly latch the head in a fixed position with respect to the power unit.
A power unit for a food preparation appliance comprising a housing having side walls and a top wall, attachment support means fastened to said top wall of said housing to receive and support various alternatively usable attachments which are to be driven by said power unit, a motor enclosed within said housing including an armature carried by a shaft, said shaft being journaled by upper and lower armature bearings, a laminated field, commutator means supported on said armature shaft, a combined upper frame member supported within said power unit housing from the top wall thereof, said upper frame member supporting said laminated field and said upper armature bearing, a lower frame member supported by said upper frame member, said lower frame member supporting said lower armature bearing and commutator brushes in engagement with said commutator means, assembly means mounting said upper frame member in said housing to permit relative movement between said motor and said housing to obtain alignment of said motor and gearing assembly with said attachment support means, said upper frame member being formed with a recess within which reduction gearing is enclosed, said shaft extending into said recess into driving engagement with said reduction gearing and having coupling means extending through said top wall to provide a high speed output shaft, said reduction gearing having a low speed output shaft which is concentric with and surrounds said high speed output shaft, said high speed output shaft having a speed on the order of 18,000 RPM and said low speed output shaft having an output speed on the order of 250 RPM.
Dependencies are inferred from the claim text.