Material separators

A material separator comprising:

• a supporting frame comprising upper and lower frame members;
• and
• a screening surface mounted at an incline on the supporting frame, the screening surface comprising a plurality of deck bars having upper and lower ends that are attached to the upper and lower frame members;
• wherein the deck bars are attached to the supporting frame only at their upper and lower ends, and are not attached to each other along their length.

A material separator comprising:

• a supporting frame;
• a screening surface mounted at an incline on the supporting frame, the screening surface comprising a plurality of fixed bars that are attached to the frame in a manner to resist upward movement, and a plurality of shift bars that are attached to the frame at their upper and lower ends, in a manner to allow upward movement;
• a shift bar actuator, positioned between the upper and lower ends of the shift bars, the shift bar actuator being configured to impart movement to the shift bars;
• and
• a deck bar support member, fixedly mounted to the frame and extending generally parallel to the shift bar actuator;
• wherein the shift bar actuator is pivotably mounted on the deck bar support member, and the deck bar support member and shift bar actuator are positioned closer to the upper ends of the shift bars than the lower ends of the shift bars.