A rotatable container assembly for use in surface treatment of particulate workpieces includes a container (30) having opposed head ends (34,36) and a polygonal side member (32) defining a work cavity (42) therein. An aperture (40) is formed in a minor portion of the side member (32) and a door (44) is arranged for opening and closing the aperture. A mechanism for imparting generally arcuate movement and generally radial movement advances and retracts the door (44) between open and closed positions. The movement-imparting mechanism includes a cam slot (68) in a gear (62) and a cam follower (94) arranged on a closely adjacent end plate (48) of the door (44). Push blocks (88,90) assist in selective rotation of the container both relative to and with the door. Locking notches (110,112,114,116) are arranged on the periphery of the end plate for operative engagement with a lock member (84,86) extending from the gear (62).
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