| 主权项 |
1. A drum type washing machine, comprising:
a housing; a water reservoir installed in the housing to contain washing water; a spin tub provided in the water reservoir to hold laundry to be washed; and a ball balancer coupled to the spin tub to compensate for a dynamic imbalance during rotation thereof, the ball balancer comprising an annular-shaped race having a closed internal space in which a plurality of balls and viscous fluid are accommodated, the annular-shaped race including a first plastic member and a second plastic member joined to each other to define the closed internal space, the first plastic member having a U-shaped cross-section and the second plastic member adapted to cover an open side of the U-shaped cross-section of the first plastic member, the second plastic member having a first surface facing the first plastic member and a second surface opposite to the first surface, wherein the U-shaped cross-section of the first plastic member is defined in part by side walls, each of the side walls including an engaging portion to engage with a portion of the second plastic member, wherein the engaging portion includes a fusion ridge adapted to be inserted within a fusion groove provided at the second plastic member and an inner pocket ridge which is spaced apart from the fusion ridge and configured to create a space to receive fusion scraps falling inward off the fusion ridge to prevent the fusion scraps from being introduced into the closed internal space of the ball balancer, the inner pocket ridge adapted to engage with a guide ridge of the second plastic member, and wherein the guide ridge of second plastic member protrudes from the first surface at an inner side of the fusion groove toward the first plastic member, and a groove is formed on the second surface at a position corresponding to the guide ridge. |
