EE was washing and cleaning up a primary impactor to paint on 6/5/14. Removed a wedge from side access door, set it on frame to do more cleaning, wedge dislodged falling onto main frame then glancing off onto his foot and ankle. He had pain but continued to work. 6th he came into work with foot swollen and having a hard time walking. Went dr 6/9/14, major contusion, off 3 weeks.