Patent ID: 8607598
Filing Date: 2013-12-17
Classification: D06F

Abstract:
1. A drum type washing machine, comprising: a housing; a spin tub to hold laundry to be washed, the spin tub rotating with respect to an axis of the washing machine; and a ball balancer coupled to the spin tub to compensate for a dynamic imbalance during rotation thereof, the ball balancer comprising a first plastic member and a second plastic member joined to each other to form a closed internal space in which a plurality of balls and viscous fluid are accommodated, wherein the spin tub includes a cylindrical body, a front cover and a rear cover, the front cover having a front wall with an opening formed therein for receiving laundry and an outer annular side wall section configured for establishing continuous circumferential surface contact with a front inner surface area of the cylindrical body such that the outer annular side wall section thereof is disposed between the ball balancer and the cylindrical body, a front annular recess is provided on the front cover and the ball balancer is installed in the front annular recess of the front cover, and the outer annular side wall section is an outer wall of the front annular recess, and the front annular recess has a depth greater than a diameter of the balls contained in the ball balancer, whereby during a rotation of the spin tub the balls contained in the ball balancer are supported in a direction of centrifugal force by the first plastic member, the outer annular side wall section and the cylindrical body.