The present invention relates to a dishwasher comprising movable nozzles.

Since washing tubs of the dishwashers generally have quadrilateral cross-sections and the spray arms create a circular washing area by rotating around their axes, dishes placed at the comers of the washing tub cannot be cleaned effectively. In addition to the corner regions, pots which are extremely dirty cannot be cleaned properly by means of conventional spray arms. The use of spray arms rotating around different axes is known for solving this problem. One of the spray arms rotates preferably around an axis at the center of the base of the washing tub while the other spray arm rotates around an eccentric axis. Thus, the end of the additional spray arm reaches further into the corner regions of the washing tub and enables the dishes in the corner regions to be cleaned more effectively or by means of the additional spray arm, an intensive washing region can be created, cleaning the dishes which are extremely dirty. However, in such embodiments, the gears which rotate the additional spray arm are disposed in the washing tub. During the washing process, dirt particles such as oil, etc. which are removed from the dishes accumulate on the gears and cause the gears to get stuck over time. Moreover, the larger dirt particles which are removed from the dishes are stuck between the gears during the washing process and block the movement of the gears. Furthermore, the use of an additional spray arm increases the production costs.

In the state of the art United States Patent Application No. US5464482, a dishwasher is disclosed, comprising two spray arms connected at different axes so as to be one above the other and gears disposed below the lower spray arm, enabling the upper spray arm to be rotated.

In the state of the art International Patent Application No. WO2015149859, a dishwasher is disclosed, comprising two spray arms which are arranged in the washing tub with one rotating the other after being rotated itself and gears which are provided in the washing tub and which that enable the spray arms to be rotated. The aim of the present invention is the realization of a dishwasher wherein the dishes placed at the comers of the washing tub are enabled to be washed more effectively without any problem.

The dishwasher realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a movable nozzle which is disposed on a spray arm connected to the water line on the base of the washing tub, and a movement mechanism which is provided in the spray arm and which enables the nozzle to be moved. By using movable nozzles on the spray arm, water can be delivered to the corner regions of the washing tub and thus, the dishes placed in regions which cannot be sprayed with water by standard spray arms are enabled to be washed.

In an embodiment of the present invention, the movement mechanism is provided in the spray arm. The movement mechanism comprises a gear group which can rotate independently of the spray arm and a bar which transmits the rotational movement of the gear group to the nozzle. When the spray arm is rotated, the gear group rotates independently and enables the bar to be rotated around its own axis. A worm gear provided on the bar moves the nozzle. By disposing the movement mechanism in the spray arm, the dirt particles in the washing tub are prevented from limiting the movement of the nozzle. Moreover, by means of the simple structure, said problems can be solved without increasing production costs.

In another embodiment of the present invention, the nozzle has a cylindrical body which extends into the spray arm. Cut-outs are provided on the body, which enable the water to be delivered to the nozzle and the worm gear to rotate the nozzle. The teeth of the worm gear engage with the cut-outs and enable the nozzle to be rotated.

In another embodiment of the present invention, the nozzle sprays water in directions other than the direction perpendicular to the surface of the spray arm. Thus, the area sprayed with water by the nozzle is increased by means of the movement of the nozzle and the rotation of the spray arm. The nozzle is enabled to act as a fluid oscillator by spraying the water in an angled manner and rotating around its own axis. In another embodiment of the present invention, the nozzle rotates at a speed that is proportional to the rotational speed of the spray arm. The rotational speed of the nozzle can be determined by changing the size of the gear group.

By means of the dishwasher of the present invention, washing performance is improved by enabling the dishes placed at the comer regions of the washing tub to be washed more effectively, and by concealing the movement mechanism, which provides the movement of the nozzle, in the spray arm, the gear group is prevented from getting dirty due to the dirt particles from the dishes and getting stuck, thus improving the aesthetic perception.

A dishwasher realized in order to attain the aim of the present invention is illustrated in the attached figures, where:

Figure 1 - is the schematic view of the dishwasher.

Figure 2 - is a exploded schematic view of the bar and the nozzle in an embodiment of the present invention.

Figure 3 - is the perspective view of the spray arm in an embodiment of the present invention.

Figure 4 - is the open view of the spray arm in an embodiment of the present invention. The elements illustrated in the figures are numbered as follows:

1- Dishwasher

2- Casing

3- Washing tub

4- Water line

5- Spray arm

6- Nozzle

7- Movement mechanism

8- Gear group 9- Bar

10- Worm gear

11- Body

12- Cut-out

The dishwasher (1) comprises a casing (2); a washing tub (3) which is disposed in the casing (2) and wherein the washing process is performed; a water line (4) which is provided in the casing (2); and a spray arm (5) which is disposed at the base of the washing tub (3) and which rotates around its own axis while being connected to the water line (4). Upon the delivery of water to the spray arm (5) from the delivery line (4), the spray arm (5) rotates around its own axis as a result of the water pressure and enables the dishes in the washing tub (3) to be washed.

The dishwasher (1) of the present invention comprises at least one nozzle (6) which is movably positioned on the spray arm (5), and a movement mechanism (7) which moves the nozzle (6) such that the nozzle (6) sprays water in different directions. The nozzle (6) is positioned on the spray arm (5). Moreover, the nozzle (6) can move on the spray arm (5) so as to spray water in different directions, wherein, the nozzle (6) can move so as to rotate around its own axis or can move linearly. Leakproofing is provided between the nozzle (6) and the spray arm (5) during the movement of the nozzle (6). During the washing process, the movement mechanism (7), by moving the nozzle (6), enables the water to be sprayed in different directions, especially towards the comers of the washing tub (3). Thus, every region of the washing tub (3) can be sprayed with pressurized water and the effectiveness of the washing process is improved.

In an embodiment of the present invention, the movement mechanism (7) has a gear group (8) which is provided in the spray arm (5) and which can rotate independently of the spray arm (5), and a bar (9) which extends in the spray arm (5) along the spray arm (5), which can rotate around its own axis while being connected to the gear group (8) and which has at least one worm gear (10) thereon providing the movement of the nozzle (6). The movement mechanism (7) is provided in the spray arm (5) and thus, the dirt particles in the washing tub (3) is prevented from limiting the movement of the nozzle (6). The gear group (8) can rotate around its own axis independently of the spray arm (5). The gear group (8) is positioned at the center/hub of the spray arm (5). The bar (9) extends along the arms/blades of the spray arm (5). The bar (9) is connected to the gear group (8) at one end and the bar (9) rotates around its own axis as the gear group

(8) rotates, and a differential gear preferably compatible with the gear group (8) is provided at the end of the bar (9) connected to the gear group (8). The worm gear (10) enabling the nozzle (6) to be moved is provided on the bar (9) and the nozzle (6) moves by means of the worm gear (10) as the bar (9) rotates.

In different versions of this embodiment, the worm gear (10) is disposed at different positions on the bar (9). For example, in the version wherein the worm gear (10) is positioned at the other end of the bar (9) and the nozzle (6) is positioned at the end of the spray arm (5), the dishes at the corners of the washing tub (3) are enabled to be washed effectively. When the worm gear (10) is positioned at the center of the bar (9), an intensive washing region is created in the washing tub (3) by means of the nozzle (6). By means of the nozzle (6) being positioned on the spray arm (5), the intensive washing region is not limited with a specific area and thus, the user can place the dishes into the washing tub (3) according to his/her preferences.

In another embodiment of the present invention, the nozzle (6) has a cylindrical body

(11) which extends into the spray arm (5) and a plurality of cut-outs (12) which are arranged on the body (11), which enable the body (11) to be compatible with the worm gear (10) and which provide the delivery of water to the nozzle (6). The nozzle (6) extends inwards from the top surface of the spray arm (5). The body (11) of the nozzle (6) is cylindrical. The body (11) is provided with the cut-outs (12) thereon and the water flowing in the spray arm (5) is transferred to the nozzle (6) by means of the cut-outs

(12). Moreover, the cut-outs (12) ensure compatibility between the body (11) and the worm gear (10) so as to enable the nozzle (6) to rotate around its own axis. As the bar

(9) rotates, the worm gear (10) rotates the nozzle (6) around its own axis.

In another embodiment of the present invention, the nozzle (6) sprays water in a direction angled with respect to the direction perpendicular to the surface of the spray arm (5). As the nozzle (6) rotates around its own axis, water can be sprayed to different regions thanks to the angled orientation of the nozzle (6).

In another embodiment of the present invention, the nozzle (6) rotates at a speed in direct proportion to the rotational speed of the spray arm (5). The movement/rotational speed of the nozzle (6) is proportional to the rotational speed of the spray arm (5). The number and sizes of gears in the gear group (8) can be adjusted as required, and the rotational speed of the nozzle (6) can be equal to or different from the speed of the spray arm (5).

By means of the movable nozzle (6) of the present invention and the movement mechanism (7) which moves the nozzle (6), every region in the washing tub (3) can be sprayed with water using a lower number of nozzles (6) in the dishwasher (1). Thus, especially the dishes which are placed at the corner regions of the washing tub (3) are enabled to be washed effectively.