Piston b slides in hydraulic cylinder a and has rod 1 which carries roller 3. Roller 3 rolls a long straifght fixed guide c. Member 2, connected to the dump body o the truck, turns about fixed axis A and has profiled cam surface d along which roller 3 rolls and slides. When piston b moves to the right, the dump body is tipped; on the return stroke the body returns to i ts horizontal position.
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