Patent ID: 7325761

Claim:
A hammer for a material size reducing machine, the material size reducing machine including a rotor on which a plurality of hammers are individually pivotally mounted, the hammer comprising: a mounting end having a throughbore for receiving a pivot pin therethrough in connection with the pivot mounting of the hammer on the rotor, whereupon the axis of the pivot pin when mounted through the throughbore extends parallel to the axis of rotation of the rotor; an extending portion extending from the mounting end and terminating in a distal end with the center of mass of the hammer being located in the extending portion and having a height extent measured radially from the pivot pin axis to the distal end of the extending portion; the extending portion having a non-linear body portion and a linear portion; the non-linear body portion being located intermediate the linear body portion and the throughbore; the linear body portion being inclined in a direction opposite to the direction of rotation of the rotor as measured relative to a line extending through the center of the pivot pin and the center of mass of the hammer; the non-linear body portion having a height extent measured from the pivot pin axis to the bottom most edge of the linear body portion of 50% to 90% of the height extent of the extending portion; and the linear body portion having a planar face and having a height extent measured from the distal end to the top most edge of the non-linear body portion of 10% to 50% of the height extent of the extending portion.