Patent ID: 9694364
Date: 2017-07-04
CPC Classifications: B02C,E03C,G01R,G01V

Claim:
1. An under-sink disposal unit, comprising a passageway through which objects pass into a disposal chamber for grinding, and a coil assembly and associated electronics configured to detect the passing of a metallic object through the passageway, wherein the arrangement of coils comprises, (a) a first coil comprising a loop that is oriented with respect to an axis of the passageway such that objects passing through the passageway pass by and proximate to, but do not pass through, the loop of the first coil, (b) a second coil comprising a loop that is oriented with respect to the axis such that objects passing through the passageway pass by and proximate to, but do not pass through, the loop of the second coil, and (c) a third coil comprising a loop that is oriented with respect to the axis such that objects passing through the passageway pass through the loop of the third coil.