Cover structure of a clothes washing machine

A clothes washing machine comprising:

• a housing with a top wall forming an access opening for loading and unloading clothes, and a pair of guide surfaces disposed on opposite sides of said access opening;
• a washing basket rotating on a vertical shaft and mounted in said housing;
• a cover assembly attached to said top wall for closing and opening said access opening, said cover assembly comprising first and second members, wherein one end of said first member is hinged to one end of said second member by means of a first hinge, with the other end of said second member hinged to said top wall by a second hinge, and the other end of said first member having a pair of roll devices for rolling on respective ones of said guide surfaces during movement of said cover assembly to an open position and a closed position, said guide surfaces being sloped downwardly in a direction traveled by said roll devices during a closing of said cover assembly;
• wherein each of said roll devices comprises a roller having a shaft arranged in parallel with respective axes of said first and second hinges, and a bracket inserted in said cover assembly for rotatably mounting said roller, a front end of each guide surface having an upwardly open cup-shaped depression for receiving a respective roller when the cover assembly is closed, to cause the cover assembly to approach the top wall.