US 3,971,514 AGranted

Meat grinder attachment

OwnerLuigi E. Martinelli, George S. Cerelliinventors

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Abstract

The invention is concerned with an improved grinder useful for grinding meat, which grinder includes a first section for coarsely grinding the meat followed by a second section for more finely grinding the meat, the two sections including screws which are coaxial with each other and driven by a common power source. The improvement comprises a cylindrical section intermediate the coarse grinding section and the fine section, the intermediate section including a shaft coaxial with both of the screws and connecting one screw to the other with a chamber surrounding said shaft. The shaft includes two partial screw threads both of which have pitches greater than the pitches of the threads in the two grinding sections. The intermediate section serves to transfer meat or the like from the coarse grinding section to the fine grinding section at a rate such that the fine grinding section can effectively grind the meat into a fine grind while not becoming clogged and not tending to overload the common power supply for the overall grinding apparatus.

Claims10

Dependent claims

In a grinder comprising a feed hopper for delivering material to be ground to a first cylindrical chamber;

a first screw having a first pitch within said first chamber for coarsely grinding and transporting said material from said hopper passed a first rotary knife mounted to said first screw and through a first plurality of generally equal sized holes in a first plate;
a second screw having a second pitch drivingly attached coaxially to said first screw within a second cylindrical chamber for finely grinding and transporting said material from said first plate passed a second rotary knife mounted to said second screw and through a second plurality of generally equal sized holes in a second plate;
the holes of said first plurality of holes being larger than the holes of said second plurality of holes;
and means for driving said first screw and thereby also said second screw;
an improvement which comprises:
a shaft coaxial with and connecting together said first and second screws;
a third cylindrical chamber surrounding said shaft and connecting said first and second chambers;
a first partial screw thread having a third pitch greater than said first pitch and greater than said second pitch, said first partial screw thread extending radially from said shaft within said third chamber commencing adjacent said first plate and terminating adjacent a central portion of said shaft;
and
a second partial screw thread non-contiguous with said first partial screw thread having a fourth pitch greater than said first pitch and greater than said second pitch, said second partial screw thread extending radially from said shaft within said third chamber commencing adjacent the central portion of said shaft and terminating adjacent said second screw.

7 more elements

Dependencies are inferred from the claim text.