US Patent 9731467 Food processor

A food processor includes a tubular member, and a spindle inserted into the tubular member and including a guide entry section, a crushing section, a grinding section, an extension section, a guide exit section, a guide thread helically wound around the guide entry section, a crushing thread helically wound around the crushing section, and a plurality of spaced-apart grinding threads helically extending from the grinding section to the guide exit section. The guide thread has first and second ring segments each helically extending one revolution around the guide entry section. The first ring segment has a thread depth smaller than that of the second ring segment.