# US 7,610,781 B2 · Drum type washing machine

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- Number: US 7,610,781 B2
- Document ID: US7610781B2
- Status: Granted
- Kind: B2
- Application number: 11/302,114
- Filed: 2005-12-14
- Published: 2007-01-11
- Granted: 2009-11-03
- Earliest claimed: 2005-07-07
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Dong Hyun Choi; Woon Gu Hur; Won Seok Choi
- Web page: https://patentgrep.com/patent/US7610781B2

## CPC

- D06F 37/065: {ribs or lifters having means for circulating the washing liquid}
- D06F: LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES

## Abstract

Disclosed herein is a drum type washing machine designed to continuously raise and drop wash water during washing operation to enhance washing efficiency. The drum type washing machine includes a tub to hold wash water, a rotational drum rotatably installed in the tub, and a water raising unit having a plurality of water pockets equipped in a rotating direction of the rotational drum to an inner rear side of the rotational drum to raise and drop the wash water when the rotational drum is rotated.

## Claims

### Claim 1

A drum type washing machine comprising:
a tub to hold wash water and a rotational drum rotatably installed in the tub; and
a plurality of water pockets formed only on an inner rear side of the rotational drum along an outer periphery of the rotational drum to raise and drop the wash water when the rotational drum is rotated, each of the plurality of water pockets being oriented to scoop the wash water from inside the rotational drum when the rotational drum is rotated in a rotating direction,
wherein each water pocket comprises:
a water inlet formed at an outer periphery of the water pocket; and
a water outlet formed near an inner periphery of the water pocket to outlet water towards a center of the rotational drum from the outer periphery of rotational drum.

### Claim 2 (depends on 1)

The washing machine according to claim 1, wherein the water inlet is formed in the rotating direction of the rotational drum to allow the wash water to easily flow into the water pocket.

### Claim 3 (depends on 2)

The washing machine according to claim 2, wherein the water pocket has a whirlwind shape curved in the rotating direction of the rotating drum and having a width gradually increased from the center of the rotational drum to the outer periphery of the rotational drum.

### Claim 4 (depends on 1)

The washing machine according to claim 1, further comprising
a ring-shaped rotational plate having an outer diameter smaller than an inner diameter of the rotational drum and coaxially fixed to the inner rear side of the rotational drum,
wherein the water pockets protrude from the inner rear side of the rotational drum from the rotational plate toward a front of the rotational drum to define water holding spaces between the inner rear side of the rotational drum and the rotational plate, respectively.

### Claim 5

A drum type washing machine comprising:
a tub to hold wash water and a rotational drum rotatably installed in the tub; and
a plurality of water pockets formed only on an inner rear side of the rotational drum along an outer periphery of the rotational drum to raise and drop the wash water when the rotational drum is rotated, each of the plurality of water pockets being oriented to scoop the wash water from inside the rotational drum when the rotational drum is rotated in a rotating direction,
wherein each water pocket comprises:
a water inlet formed at an outer periphery of the rotational drum; and
a water outlet formed in the water pocket itself at an outer periphery of the rotational drum near to the water inlet.