Patent ID: 7530512

Claim:
A rotor for a vertical shaft impact crusher, said rotor comprising a horizontal upper disc and a horizontal lower disc, said discs being separated by at least two vertical wall segments defining between them an outflow opening for material leaving the rotor, said wall segments each having a first wall portion being substantially tangential in relation to the rotor and being located adjacent to the periphery of the rotor and a second wall portion being angled in relation to said first wall portion and extending from the first wall portion into the rotor, wherein said second wall portion comprises a straight first section extending from the interior of the rotor towards the periphery of the rotor, said first section forming an obtuse first interior angle with said first wall portion, and a second section connecting the first section and the first wall portion, said second section and said first wall portion forming a second interior angle being smaller than said first interior angle, said second section and said first wall portion forming at least one pocket for retaining material, wherein an end of the second section contacts an end of the first wall portion and the second section is oriented in a radial direction relative to an axis of rotation of the rotor.