a locking aperture 43 for receiving a locking protuberance 51 formed in the pocket 50 the roll 30 is rotatably mounted on the bracket 40 by means of the shaft 60 fixed in the holes 42 while the bracket 40 is mounted in the pocket 50 formed in the leading end 21a of the first member 21 the locking protuberance 51 is formed on the rear wall of the pocket 50 so as to be locked in the locking aperture 43 of the bracket 40 the roll 30 is protruded outwardly i e downwardly in fig3 5 from the leading end 21a of the first member 21 so as to properly contact a pair of guide surfaces 13l and 13r formed on the cover frame 13 when the first member 21 rotates around the hinge 23 the guide surfaces 13l and 13r are ultilized for guiding the rolls so as to smoothly open or close the cover assembly 20 they are sloped downwardly toward the front portion of the washer from the position at which the roll devices 100 are disposed when the cover assembly 20 is completely opened as shown in fig3 the rear ends of the guide surfaces 13l and 13r maintain a slope enabling the roll devices 100 to contact the guide surfaces in operation when loading or unloading clothes into or from the washing basket 12 the first member 21 is raised upwardly by grasping the grip 24 in the closed position of the cover assembly 20 as shown in fig5 so that the first and second members 21 and 22 are folded by.