WO2023277580A1

WO2023277580A1 - Dishwasher

Info

Publication number: WO2023277580A1
Application number: PCT/KR2022/009337
Authority: WO
Inventors: 김승훈; 심훈섭; 김진동
Original assignee: 엘지전자 주식회사
Priority date: 2021-07-01
Filing date: 2022-06-29
Publication date: 2023-01-05
Also published as: KR20230005619A

Abstract

The present disclosure relates to a dishwasher, and the dishwasher according to an aspect of the present disclosure comprises: a tub having an opening in the front portion thereof, through which an object to be washed enters and exits; a door which is rotatably connected to the tub and opens/closes the opening; a rack which is arranged in the tub and accommodates the object to be washed; a wheel which is connected to a wire of the rack and includes a roller arranged to move in back and forth directions through the opening, wherein the roller moves in back and forth directions along the tube and one surface of the door; a shaft which is inserted in the wheel; and an elastic body arranged between the wire and the shaft, and thus, when the roller passes through a boundary between the tub and the door, the elastic body reduces the vibration of the roller so as to minimize shaking of the rack.

Description

dish wash machine

The present disclosure relates to a dishwasher, and more particularly, to a rack drawn from a tub.

A dishwasher is a device that cleans and sterilizes a washing object by spraying washing water and steam onto a washing object accommodated in a tub.

A rack for storing objects to be washed is disposed inside the tub, and the rack can be drawn out of the tub after the door of the dishwasher is opened.

The rack may be connected to a roller continuously moving along one surface of the tub and one surface of the door to facilitate entry and exit from the tub. In order to minimize the load required for withdrawing the rack and the shaking of the rack generated during the process of withdrawing the rack, one surface of the tub providing a roller rolling surface and one surface of the door need to be positioned at the same height.

However, due to tolerances generated as the door and the tub are manufactured as separate parts, a height difference occurs between one surface of the door and one surface of the tub when the door is opened. For this reason, in the conventional dishwasher, when the roller passes the boundary between the tub and the door, the load required to withdraw the rack increases and the rack shakes.

US Patent No. 6571965 discloses a roller that facilitates the withdrawal of a rack, but there is a problem in that an excessive pulling force is required and shaking of the rack increases when the roller passes the boundary between the tub and the door.

The present disclosure aims to solve the foregoing and other problems.

Another object of the present disclosure may be to facilitate the withdrawal of the rack.

Another object of the present disclosure may be to minimize the load required to pull out the rack.

Another object of the present disclosure may be to minimize shaking of the rack in the process of withdrawing the rack.

Another object of the present disclosure may be to minimize vibration generated when a roller passes a boundary between a tub and a door.

Another object of the present disclosure may be to simplify the structure of the shock absorber of the roller.

The objects of the present disclosure are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

A dishwasher according to one aspect of the present disclosure for achieving the above object includes a tub formed with an opening through which a washing object enters and leaves the front; and a door rotatably connected to the tub and opening and closing the opening.

The dishwasher includes a rack disposed inside the tub and accommodating the object to be washed.

The dishwasher includes a roller connected to the wire of the rack and movable in a forward and backward direction passing through the opening.

The roller includes a wheel that moves forward and backward along one surface of the tub and the door.

The roller includes a shaft inserted into the wheel.

The roller may include an elastic body disposed between the wire and the shaft to reduce vibration generated when the roller passes a boundary between the tub and the door.

The shaft may include a first shaft portion inserted into the wheel; and a second shaft portion extending upward from the first shaft portion.

The elastic body may be disposed on an upper side of the second shaft unit and may be compressed in a vertical direction.

The second shaft part may extend toward an upper end of the wheel.

The elastic body may be positioned above the upper end of the wheel.

The wire may include a first wire extending in the forward and backward directions; and a second wire extending in a direction crossing the first wire.

The elastic body may be disposed between the second wire and the shaft.

The dishwasher may further include a holder accommodating the shaft and the elastic body and through which the wire passes.

The holder may include a first accommodating portion surrounding the shaft; and a second accommodating portion that extends upward from the first accommodating portion and has a larger width in the front-back direction than the first accommodating portion.

The elastic body may be located inside the second accommodating part.

A dishwasher according to another aspect of the present disclosure for achieving the above object includes a roller connected to the wire of the rack and movably disposed in a forward and backward direction passing through the opening, wherein the roller comprises the tub and a wheel moving forward and backward along one side of the door. a shaft inserted into the wheel; and a shaft groove into which the shaft is inserted and having a longitudinal width greater than a diameter of the shaft.

The shaft groove may have a width in a vertical direction equal to or greater than a diameter of the shaft and may extend in a forward and backward direction.

The shaft may include a first shaft portion extending toward the wheel; and a second shaft portion extending upward from the first shaft portion.

The roller may include a rotation shaft inserted into the wheel and a holder surrounding the first shaft unit.

A front-back width of the shaft groove may be greater than a radius of the rotation shaft.

The shaft groove may include a first groove portion extending in the front-rear direction; and a second groove portion obliquely extending upward from the first groove portion.

The second groove may extend obliquely opposite to a direction from the tub toward the door.

An angle between a direction in which the first groove part extends and a direction in which the second groove part extends may be an acute angle.

A dishwasher according to another aspect of the present disclosure for achieving the above object includes: a first roller connected to the rack and movable in a forward and backward direction passing through the opening; and a second roller connected to the rack in front of the first roller and having a lower end positioned above the lower end of the first roller.

A diameter of the second roller may be smaller than a diameter of the first roller.

The center of rotation of the second roller may be located higher than the center of rotation of the first roller.

The rack includes a first wire extending along the front-back direction; and a third wire extending obliquely forward from the first wire.

The second roller may be disposed at a position where the first wire and the third wire intersect.

Details of other embodiments are included in the detailed description and drawings.

According to at least one of the embodiments of the present disclosure, the withdrawal of the rack can be facilitated.

According to at least one of the embodiments of the present disclosure, when the roller passes the boundary between the tub and the door, the elastic member can alleviate the vibration of the roller, thereby minimizing the vibration of the rack.

According to at least one of the embodiments of the present disclosure, when the roller passes the boundary between the tub and the door, vibration of the roller is reduced by the shock absorber, so that a load required to withdraw the rack can be minimized.

According to at least one of the embodiments of the present disclosure, when the roller passes the boundary between the tub and the door, the shaft is moved within a predetermined range in the shaft groove, thereby preventing a load from being rapidly increased.

According to at least one of the embodiments of the present disclosure, before the first roller enters the boundary between the tub and the door, the second roller is seated on the door first, so that the first roller enters the boundary between the tub and the door. It can prevent the load from increasing rapidly when doing so.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a front view of a dishwasher according to the present disclosure.

2 is an internal structure diagram of a dishwasher according to the present disclosure.

3 is a diagram illustrating a state in which the door of the dishwasher according to the present disclosure is opened.

4 is a perspective view of a roller according to a first embodiment of the present disclosure.

5 is a rear view of a roller according to a first embodiment of the present disclosure.

6 is a front view of a roller according to a second embodiment of the present disclosure.

7 is a cross-sectional view taken along the line C-C' of FIG. 6;

8 is a conceptual diagram of a shaft groove according to a second embodiment of the present disclosure.

9 is a side view of a rack according to a third embodiment of the present disclosure.

10 is a graph showing the effects of the present disclosure.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Hereinafter, the present invention will be described with reference to drawings for explaining a dishwasher according to embodiments of the present invention.

Referring to FIG. 1 , the overall appearance of the dishwasher 1 will be described first. 1 shows the overall appearance of the dishwasher 1.

The dishwasher 1 includes a cabinet 10 in which a tub 100 (see FIG. 2) for accommodating objects to be washed is disposed, and a door 20 disposed in front of the cabinet 10.

The cabinet 10 may form the outer shape of the dishwasher 1 and may have a rectangular column shape. The front of the cabinet 10 may be opened, and an object to be washed may be introduced into the tub 100 through the opening 11 (see FIG. 3 ) of the cabinet 10 .

The opening 11 may be a space communicating the outside of the cabinet 10 and the inside of the tub 100 .

The door 20 may open or close the opening 11 of the cabinet 10 . The door 20 may close the opening 11 to seal the tub 100 , and open the opening 11 to allow the tub 100 to communicate with the outside of the cabinet 10 .

The door 20 includes a door body 21 forming the exterior of the door 20, a lower door 22 connected to the lower side of the door body 21, and the door body 21 and the lower door 22. It may include a link 23 connecting the.

The door body 21 may be moved forward using the link 23 as a rotation axis. The door body 21 may be moved forward using the rotational axis of the link 23 to open the opening 11 of the cabinet 10 . When the door body 21 is moved forward to open the opening 11, the washing space 100S of the tub 100 may communicate with the outside of the cabinet 10.

The lower door 22 may be fixed to the cabinet 10 . The lower door 22 may be fixed to the cabinet 10 even when the door body 21 moves forward.

The link 23 may be rotatably connected to the lower door 22 . The link 23 can connect the door body 21 and the lower door 22 and rotate the door body 21 .

However, the door 20 may be configured as a single door body 21 without the lower door 22 and the link 23. In this case, the door 20 is rotated around the hinge 24 disposed inside the door 20 to communicate the washing space 100S with the outside or to seal the washing space 100S.

The dishwasher 1 may include a control panel 30 connected to an upper side of the door 20 . The control panel 30 may be a display capable of displaying driving information of the dishwasher 1 and selecting an operation course of the dishwasher 1 . The control panel 30 may be connected to the door 20 to form a front surface of the door 20 . The control panel 30 is connected to the door body 21 and can move forward together with the door body 21 . The control panel 30 may be moved forward to open the opening 11 of the cabinet 10 . When the control panel 30 is moved forward to open the opening 11, the washing space 100S may communicate with the outside of the cabinet 10.

Hereinafter, the internal structure of the dishwasher 1 will be described with reference to FIG. 2 . FIG. 2 is a view of the dishwasher 1 shown in FIG. 1 as viewed from the side by cutting it up and down.

In the tub 100, a washing target is accommodated and washing water is sprayed. The tub 100 is disposed inside the cabinet 10 and forms a washing space 100S in which a washing target is accommodated.

At the lower side of the tub 100, a driving unit 200 for circulating washing water is disposed. The driving unit 200 may be disposed inside the cabinet 10 . The driving unit 200 forms a driving space 200S in which structures for circulation of washing water, which will be described later, are disposed.

Inside the tub 100, an upper rack 110 on which an object to be washed is seated, and a lower rack 120 disposed below the upper rack 110 and on which an object to be washed is seated may be disposed.

Inside the tub 100 , a plurality of

spray tubes

150 , 160 , and 170 may be disposed to spray washing water toward washing objects seated on the upper rack 110 and the lower rack 120 . The

injection tubes

150 , 160 , and 170 may have a bar shape extending in the width direction of the

racks

110 and 120 and may have a rotation shaft extending in the width direction of the

racks

110 and 120 . The

injection tubes

150, 160, and 170 may have a cross shape formed by crossing two types of frames arranged side by side with the

racks

110 and 120, and may have a rotation shaft extending in the vertical direction.

The

injection tubes

150 , 160 , and 170 may have a tube shape and may be disposed below the upper rack 110 or below the lower rack 120 . The

injection tubes

150, 160, and 170 may have a cross-shaped shape and may be referred to as "a spray rock".

The plurality of

injection tubes

150, 160, and 170 include a lower injection tube 150 disposed below the lower rack 120 and an upper injection tube disposed between the upper rack 110 and the lower rack 120 ( 160) and a top spray tube 170 disposed above the upper rack 110. The lower injection tube 150 and the upper injection tube 160 may be referred to as “injection arms”.

Each of the plurality of

injection tubes

150 , 160 , and 170 may receive washing water from the washing pump 220 . Inside the tub 100, a first injection pipe 130 and a second injection pipe 140 extending from the driving unit 200 may be disposed.

The first injection pipe 130 extends upward from the switching valve 240 and may extend toward the upper injection tube 160 .

The second injection pipe 140 extends upward from the switching valve 240 and may extend toward the top injection tube 170 .

The upper injection tube 160 may be connected to the first injection pipe 130 and receive washing water through the first injection pipe 130 . The top spray tube 170 is connected to the second spray pipe 140 and can receive washing water through the second spray pipe 140 .

However, the dishwasher 1 according to the embodiment of the present invention may not include the first injection pipe 130 and the second injection pipe 140, but only a single second injection pipe 140. there is. In this case, the upper injection tube 160 and the top injection tube 170 are connected to the second injection pipe 140, respectively, so that washing water may be supplied through the second injection pipe 140. The washing water introduced into the second injection pipe 140 through the switching valve 240 may be distributed to the upper injection tube 160 and the top injection tube 170, respectively.

The lower injection tube 150 is connected to the switching valve 240 and can receive washing water through the switching valve 240 .

The lower spray tube 150 may be rotatably disposed in the tub 100 and may be rotated using an upper and lower shaft as a rotation shaft to spray washing water toward the lower portion of the lower rack 120 .

The lower injection tube 150 may include a plurality of lower injection nozzles 151 . The lower spray nozzle 151 may open toward the washing space 100s and spray washing water toward the lower rack 120 .

The upper spray tube (spray arm) 160 may be rotatably disposed in the tub 100 and may be rotated using an upper and lower shaft as a rotation shaft to spray washing water to the lower portion of the upper rack 110 .

The upper injection tube 160 may include a plurality of upper injection nozzles 161 . The upper spray nozzle 161 may open toward the washing space 100s and spray washing water toward the upper rack 110 and the deodorizing device 300 .

The lower injection nozzle 151 and the upper injection nozzle 161 may be referred to as “injection nozzles”.

The top spray tube 170 may be rotatably disposed on the upper side of the tub 100 and may evenly spray the washing water toward the inside of the tub 100 .

Inside the tub 100, a steam spray nozzle 180 for supplying steam into the tub 100 is disposed. The steam spray nozzle 180 may be disposed in front of the tub 100 adjacent to the door 20 . The steam spray nozzle 180 may be disposed to face the lower rack 120 .

The steam injection nozzle 180 may be connected to the washing pump 220 of the driving unit 200 to receive steam generated by the washing pump 220 .

The washing space 100S may be defined as a space in which a washing object, a plurality of

injection tubes

150, 160, and 170, and a steam nozzle 180 are disposed, and the driving space 200S is a portion of the washing space 100S. It may be defined as a space for circulation of washing water formed on the lower side.

The drive unit 200 includes a sump 210 collecting washing water sprayed toward the washing space 100S, a washing pump 220 extruding the washing water collected in the sump 210 toward the tub 100, and washing A heater 230 connected to the pump 220 to heat the washing water flowing in the washing pump 220, a switching valve 240 distributing the washing water extruded from the washing pump 220, and collecting water in the sump 210 A drain pump 250 extruding the washed water out of the cabinet 10 may be included.

The sump 210 may include a filter 211 that filters foreign substances contained in the collected washing water.

The sump 210 may be connected to an external water source (not shown) through a water supply pipe 213 and may receive washing water from an external water source (not shown). A water supply valve 214 for adjusting the flow rate of washing water in the water supply pipe 213 may be disposed in the water supply pipe 213 .

The washing pump 220 may be connected to the sump 210 through a pump inlet pipe 223 . Washing water collected into the sump 210 may flow into the washing pump 220 through the pump inlet pipe 223 when the washing pump 220 is operated.

The heater 230 may heat the washing water introduced into the washing pump 220 to generate hot water or steam. The heater 230 may be disposed below the washing pump 220 and may be integrally manufactured with the washing pump 220 .

Washing water in a warm water state heated by the washing pump 220 may flow into the switching valve 240 through the pump discharge pipe 234 . The washing water introduced into the switching valve 240 may be distributed to the spray arm 150 , the first distribution pipe 130 and the second distribution pipe 140 . The switching valve 240 may selectively flow the introduced washing water to any one of the spray arm 150 , the first distribution pipe 130 and the second distribution pipe 140 .

Washing water in a steam state heated by the washing pump 220 may flow to the steam nozzle 180 through the steam nozzle inlet pipe 183 . The steam nozzle 180 may be connected to the washing pump 220 through the steam nozzle inlet pipe 183 and receive steam from the washing pump 220 .

The drain pump 250 may be connected to a drain pipe 254 extending to the outside of the cabinet 10 . Washing water collected inside the sump 210 may be extruded by the drain pump 250 and discharged to the outside of the cabinet 10 through the drain pipe 254 .

A dispenser 190 supplying detergent to the inside of the tub 100 may be disposed in the washing space 100s. The dispenser 190 may be coupled to the door 20 .

Hereinafter, a structure in which the rack 120 is drawn out from the tub 100 will be described with reference to FIG. 3 . FIG. 3 shows a state in which the rack 120 is pulled out of the cabinet 10 from the washing space 100s when the door 20 is opened. In FIG. 3 , structures other than those related to the cabinet 10 , the door 20 , and the rack 120 are omitted.

The door 20 may be rotatably connected to the tub 100 . The door 20 may be connected to the tub 100 through a hinge 24 . The door 20 can be rotated in the forward and backward directions using the hinge 24 as a pivot.

When the door 20 opens the opening 11 , the rack 120 may be drawn out of the cabinet 10 . The rack 120 can accommodate a plurality of objects D to be washed. The rack 120 may be drawn forward along the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 .

The rack 120 may include a roller 300 that moves forward and backward along the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 . The roller 300 may be referred to as a "buffering device".

The roller 300 may contact the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 . The roller 300 may roll on the upper side of the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 .

The rack 120 may include a first wire 121 extending in the front-back direction and a second wire 122 extending in a direction crossing the first wire 121 . The roller 300 may be connected to the second wire 122 . The second wire 122 may extend in the vertical direction.

The roller 300 may support the load of the rack 120 and the object D stored in the rack 120 . The first wire 121, the second wire 122, and the washing object D are spaced apart on the upper side of the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 by the roller 300. It can be.

A height difference G may be formed between the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 . The rear surface 20a of the door 20 may be positioned above the lower surface 100a of the tub 100 .

In order to reduce shock and vibration generated in the roller 300, it is preferable that the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 are located at the same height. However, since the tub 100 and the door 20 are separate parts and are manufactured by independent manufacturing processes, design tolerances occur between the tub 100 and the door 20 . Due to the design tolerance, a height difference G may be formed between the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 .

After moving along the lower surface 100a of the tub 100, the roller 300 may overcome the height difference G and move forward along the rear surface 20a of the door 20.

When the roller 300 passes the boundary between the lower surface 100a of the tub 100 and the rear surface 20a of the door 20, shock and vibration may be generated in the roller 300 due to the height difference G. can

Hereinafter, the shock absorber 300 according to the first embodiment will be described with reference to FIGS. 4 and 5 . 4 is a perspective view of the shock absorber 300 according to the first embodiment, and FIG. 5 is a rear view of the shock absorber 300 according to the first embodiment.

The shock absorber 300 may be a roller 300.

The roller 300 includes a wheel 310 that moves forward and backward along the

surfaces

100a and 20a of the tub 100 and the door 20, a shaft 320 inserted into the wheel 310, and a wire ( 122) and the elastic body 330 disposed between the shaft 320.

The overall outer shape of the wheel 310 may be cylindrical, and an outer circumferential surface may contact one

surface

100a or 20a of the tub 100 and the door 20 .

The wheel 310 includes an outer body 311 in contact with the tub 100 and the door 20, an inner body 312 having a smaller diameter than the outer body 311, and a wheel from the inner body 312 ( 310) and a plurality of ribs 313 extending radially inside, and an axial coupling part 314 disposed radially inside the inner body 312.

The wheel 310 may roll on the lower surface 100a of the tub 100 and the rear surface 20a of the door 20 .

The shaft 320 may include a first shaft portion 321 inserted into the wheel 310 and a second shaft portion 322 extending upward from the first shaft portion 321 .

The second shaft part 322 may extend in the vertical direction, and the first shaft part 321 may extend in a direction crossing the second shaft part 322 . The first shaft part 321 may extend from the lower end of the second shaft part 322 toward the center of rotation of the wheel 310 .

The elastic body 330 may be disposed above the second shaft part 322 . The elastic body 330 may be seated on the upper side of the second shaft part 322 . In addition, the elastic body 330 may be disposed to surround the second shaft part 322 .

The second wire 122 may be disposed on the upper side of the elastic body 330 . The elastic body 330 may be disposed between the second wire 122 and the second shaft part 322 . In addition, the elastic body 330 may be disposed to surround the second wire 122 and the second shaft portion 322 .

The second wire 122 and the second shaft part 322 may be manufactured as separate parts. At this time, the elastic body 330 may be disposed between the second wire 122 and the second shaft portion 322 . The second shaft part 322 may receive an upward impact when the roller 300 passes the boundary between the tub 100 and the door 20, and the elastic body 330 may be affected by the second shaft part 322 and the second shaft part 322. It is compressed between the second wires 122 and can alleviate the impact.

The second wire 122 and the second shaft portion 322 may be integrally manufactured. At this time, the elastic body 330 may be disposed to surround the second wire 122 and the second shaft portion 322 . The integrated second wire 122 and the second shaft portion 322 can be impacted upward when the roller 300 passes the boundary between the tub 100 and the door 20, and the elastic body 330 The shock can be alleviated by being compressed by being blocked by the fence 347 of the holder 340 to be described later.

The shock absorber 300 may further include a holder 340 accommodating the shaft 320 and the elastic body 330 and through which the

wires

121 and 122 pass.

The holder 340 may be disposed between the wheel 310 and the rack 120 .

The holder 340 includes a first accommodating portion 341 surrounding the shaft 320, and a second accommodating portion 341 that extends upward and has a larger width in the front-back direction than the first accommodating portion 341. It may include a receiving portion 342 and a rotating shaft 343 inserted into the shaft coupling portion 313 .

The first shaft part 321 and the second shaft part 322 may be accommodated inside the first accommodating part 341 . A part of the elastic body 330 and the second wire 122 may be accommodated inside the second accommodating part 342 .

The rotating shaft 343 may extend from the first accommodating part 341 toward the wheel 310 . The rotating shaft 343 may be inserted into a space formed inside the shaft coupling part 313 . A shaft insertion groove 344 into which the shaft 320 is inserted may be formed inside the rotating shaft 343 . The first shaft part 321 may be inserted into the shaft insertion groove 344 .

The holder 340 may include a first wire groove 345 into which the first wire 121 is inserted, and a second wire groove 346 into which the second wire 122 is inserted. The first wire groove 345 may extend long in the front-back direction, and the second wire groove 346 may extend long in the vertical direction. The second wire groove 346 may be formed at a position closer to the rack 120 than the first wire groove 345 .

The elastic body 330 may be disposed below the first wire 121 . The elastic body 330 may be disposed in the second wire groove 346 below the first wire groove 345 .

The elastic body 330 may be positioned above the upper end 310a of the wheel 310 .

The second wire groove 346 may extend vertically inside the first accommodating part 341 and the second accommodating part 342 .

Inside the holder 340, a circumferential wall 346a forming a second wire groove 346 may be formed therein. The second wire 122 and the second shaft portion 322 may be disposed in the second wire groove 346 formed inside the circumferential wall 346a.

The holder 340 may include a fence 347 protruding from the circumferential wall 346a toward the second wire 122 . The fence 347 may be positioned above the elastic body 330 .

When the second shaft unit 322 moves upward, the elastic body 330 may come into contact with the lower surface of the fence 347 . The elastic body 330 may be compressed between the fence 347 and the second shaft part 322 . Alternatively, the holder 340 may not include the fence 347, and the elastic body 330 may be compressed between the second wire 122 and the second shaft portion 322.

Hereinafter, the shock absorber 400 according to the second embodiment will be described with reference to FIGS. 6 to 8 . 6 is a front view of the shock absorber 400 according to the second embodiment, FIG. 7 is a cross-sectional view of the shock absorber 400 along the line C-C′ shown in FIG. 6, and FIG. 8 is a shaft groove 444a. ) It is a diagram showing various embodiments of.

The shock absorber (or roller) 400 may include a wheel 410, a shaft 420, and a holder 440. The description of the wheel 410 and the shaft 420 may be applied to the description of the wheel 310 and the shaft 320 in the first embodiment.

The holder 440 may include a first accommodating portion 441 in which the shaft 420 is accommodated, and a rotating shaft 443 protruding from the first accommodating portion 441 toward the wheel 410 .

The rotating shaft 443 may be inserted into the shaft coupling part 414 connected to the plurality of ribs 413 of the wheel 410 . A cylindrical groove 444 may be formed inside the rotation shaft 443 in the radial direction.

The shaft 420 may include a first shaft portion 421 extending toward the groove 444 and a second shaft portion 422 extending upward from the first shaft portion 421 . The first shaft part 421 and the second shaft part 422 may be accommodated inside the holder 440 .

The roller 400 may include

shaft grooves

444a and 444b into which the shaft 420 is inserted and having a front-back width greater than the diameter of the shaft 420 . The

shaft grooves

444a and 444b may be formed inside the holder 440 .

The

shaft grooves

444a and 444b may include a first shaft groove 444a extending in the front-back direction and a second shaft groove 444b extending in the vertical direction.

The first shaft part 421 may be accommodated in the first shaft groove 444a, and the second shaft part 422 may be accommodated in the second shaft groove 444b.

The first shaft groove 444a may have a vertical width equal to or greater than the diameter of the first shaft portion 421 . The first shaft groove 444a may have a front-back width greater than the diameter of the first shaft portion 421 . The first shaft part 421 may be moved forward and backward inside the first shaft groove 444a.

The width of the first shaft groove 444a in the front-back direction may be greater than the radius of the rotation shaft 443 .

The rotating shaft 443 may be inserted into the groove 444 and may extend toward the rack 120 . At least a portion of the rotating shaft 443 may protrude toward the rack 120 from the shaft coupling portion 414 . At least a portion of the rotating shaft 443 may be positioned between the wheel 410 and the rack 120 .

The first accommodating part 441 may be located between the wheel 410 and the rack 120 .

The first shaft groove 444a may be formed inside the first accommodating part 441 . The first shaft groove 444a may be positioned between the wheel 410 and the rack 120 . The first shaft groove 444a may extend forward and backward between the wheel 410 and the rack 120 . The first shaft groove 444a may intersect the groove 444 and communicate with the groove 444 .

The first shaft part 421 may be positioned between the wheel 410 and the rack 120 . The first shaft unit 421 may move inside the first shaft groove 444a formed between the wheel 410 and the rack 120 .

When the roller 400 passes the boundary between the tub 100 and the door 20, the shock and vibration applied to the wheel 410 cause the first shaft part 421 to move inside the first shaft groove 444a. can be moved from

The shaft 420 may be integral with the second wire 122 . The rotation shaft 443 may provide a rotation center of the wheel 410 . When impact and vibration are applied to the wheel 410, the rotating shaft 443 of the holder 440 is shaken, and the shaft 420 inserted into the holder 440 is also shaken. Due to this, the second wire 122 integral with the shaft 420 is shaken, and the entire rack 120 is shaken. At this time, by forming the first shaft groove 444a, which is a gap space, in the space where the shaft 420 is accommodated, collision between the shaft 420 and the holder 440 is prevented up to a predetermined vibration range, and the rack 120 vibration can be minimized.

The first shaft groove 444a may extend in the front-back direction, or may extend obliquely in the front-back direction (444a').

When the first shaft groove 444a extends only in the forward and backward directions, the first shaft portion 421 may move only in the forward and backward directions within the first shaft groove 444a.

When the first shaft groove 444a' extends obliquely in the front-back direction, the first shaft portion 421 may move in the front-back and vertical directions within the first shaft groove 444a'.

The first shaft groove 444a' may include a first groove portion 444a1 extending in the front-back direction and a second groove portion 444a2 extending obliquely upward from the first groove portion 444a1.

The second groove 444a2 may extend obliquely opposite to the direction from the tub 100 toward the door 20 .

An angle θ between a direction in which the first groove portion 444a1 extends and a direction in which the second groove portion 444a2 extends may be an acute angle. The angle (θ) may be within a range of 40 to 50 degrees, preferably 45 degrees.

When the first shaft groove 444a' has the first groove part 444a1 and the second groove part 444a2, vibration in the vertical direction as well as the front-back direction can be reduced.

Hereinafter, the

shock absorbers

500 and 530 according to the third embodiment will be described with reference to FIG. 9 . 9 is a side view of the rack 120 in which

shock absorbers

500 and 530 according to the third embodiment are installed.

The

shock absorbers

500 and 530 include a first roller 500 connected to the rack 120 and disposed movably in the forward and backward directions through the opening 11, and a rack ( 120) and the lower end 530a may include a second roller 530 positioned above the lower end 500a of the first roller 500.

The first roller 500 may include a first wheel 510 and a first shaft 520 . The description of the first wheel 510 and the first shaft 520 may be applied to the description of the wheel 310 and the shaft 320 of the first embodiment.

The second roller 530 may include a second wheel 531 and a second shaft 532 . The description of the second wheel 531 and the second shaft 532 may be applied to the description of the wheel 310 and the shaft 320 of the first embodiment.

The first roller 500 and the second roller 530 may be connected to the second wire 122 . The first shaft 520 and the second shaft 532 may be connected to the second wire 122 . The first wheel 510 and the second wheel 531 may be rotatably connected to the second wire 122 .

The rack 120 includes a first wire 121 extending in the longitudinal direction, a second wire 122 extending in the vertical direction, and a third wire 123 extending obliquely forward from the first wire 121. ), and a front wire 124 extending upward from the third wire 123.

The third wire 123 may be inclined upward toward the front. The front wire 124 may be a second wire 122 located at the front of the rack 120 .

The second roller 530 may be disposed in an area where the first wire 121 and the third wire 123 intersect.

The diameter D2 of the second roller 530 may be smaller than the diameter D1 of the first roller 500 .

The center of rotation O2 of the second roller 530 may be located higher than the center of rotation O1 of the first roller 500 .

The rotational center O1 of the first roller 500 and the rotational center O2 of the second roller 530 may have a difference in height by the distance A.

The height difference A between the center of rotation O1 of the first roller 500 and the center of rotation O2 of the second roller 530 is the lower surface 100a of the tub 100 and the rear surface of the door 20 ( 20a) may be smaller than the height difference (G) between them. Accordingly, when the second roller 530 reaches the boundary between the tub 100 and the door 20, the second roller 530 moves through the rear surface 20a of the door 20 through interference with the door 20. can be installed stably.

The second roller 530 reaches the boundary between the tub 100 and the door 20 earlier than the first roller 500 . Since the gap (A) is smaller than the height difference (G), when the second roller 530 is seated on the rear surface 20a of the door 20, the first roller 530 moves along the gap A and It can be lifted upward by the difference in the height difference (G). Accordingly, when the first roller 530 reaches the boundary between the tub 100 and the door 20, the first roller 530 overcomes the height difference G and smoothly moves the rear surface of the door 20. (20a).

Hereinafter, with reference to FIG. 10, the effect of the shock absorber of the present disclosure will be described. Figure 10 is a comparison of the load required to withdraw the rack 120 before and after application of the shock absorber according to embodiments of the present disclosure.

The horizontal axis of the graph represents the elapsed time for the rack 120 to be withdrawn, and the vertical axis represents the load required to withdraw the rack 120.

Referring to FIG. 10 , the graph on the left is a graph before application of the shock absorber according to an embodiment of the present disclosure, and the graph on the right is a graph after application of the shock absorber according to embodiments of the present disclosure.

Referring to the graph on the left, it can be seen that the load required to withdraw the rack rapidly increases in the P region, when the roller passes the boundary between the tub and the door.

Referring to the graph on the right, it can be seen that the load required to withdraw the rack does not increase even when the roller passes the boundary between the tub and the door.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Various modifications and implementations are possible by those skilled in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

Claims

a tub formed with an opening at the front through which objects to be washed come in and out;

a door rotatably connected to the tub and opening and closing the opening;

a rack disposed inside the tub and accommodating the washing object;

A roller connected to the wire of the rack and disposed movably in the forward and backward directions passing through the opening,

the roller,

a wheel moving forward and backward along one surface of the tub and the door;

a shaft inserted into the wheel; and

A dishwasher comprising an elastic body disposed between the wire and the shaft.
According to claim 1,

the shaft,

a first shaft part inserted into the wheel; and

A second shaft portion extending upward from the first shaft portion;

The elastic body,

The dishwasher is disposed on the upper side of the second shaft unit and is compressed in a vertical direction.
According to claim 2,

The second shaft part,

It extends toward the top of the wheel,

The elastic body,

A dishwasher positioned above the top of the wheel.
According to claim 1,

the wire,

A first wire extending along the front-back direction; and

And a second wire extending in a direction crossing the first wire,

The elastic body,

A dishwasher disposed between the second wire and the shaft.
According to claim 1,

The dishwasher further comprises a holder accommodating the shaft and the elastic body and through which the wire passes.
According to claim 5,

the holder,

a first accommodating portion surrounding the shaft; and

A second accommodating portion extending upward from the first accommodating portion and having a larger width in the front-back direction than the first accommodating portion,

The elastic body,

A dishwasher positioned inside the second accommodating part.
a tub formed with an opening at the front through which objects to be washed come in and out;

a door rotatably connected to the tub and opening and closing the opening;

a rack disposed inside the tub and accommodating the washing object;

A roller connected to the wire of the rack and disposed movably in the forward and backward directions passing through the opening,

the roller,

a wheel moving forward and backward along one surface of the tub and the door;

a shaft inserted into the wheel; and

A dishwasher comprising: a shaft groove into which the shaft is inserted and having a front-and-back direction width greater than a diameter of the shaft.
According to claim 7,

The shaft groove,

A dishwasher having a vertical width equal to or greater than the diameter of the shaft and extending in a longitudinal direction.
According to claim 7,

the shaft,

a first shaft part extending toward the wheel; and

A second shaft portion extending upward from the first shaft portion;

the roller,

A rotation axis inserted into the wheel and a holder surrounding the first shaft portion,

The dishwasher of claim 1 , wherein the width of the shaft groove in the front-back direction is greater than the radius of the rotation shaft.
According to claim 7,

The shaft groove,

a first groove extending in the front-back direction; and

A dishwasher comprising a second groove extending obliquely upward from the first groove.
According to claim 10,

The second groove part,

It extends obliquely in the opposite direction of the direction from the tub toward the door,

An angle between a direction in which the first groove part extends and a direction in which the second groove part extends is an acute angle.
a tub formed with an opening at the front through which objects to be washed come in and out;

a door rotatably connected to the tub and opening and closing the opening;

a rack disposed inside the tub and accommodating the washing object;

a first roller connected to the rack and movably disposed in the forward and backward directions passing through the opening; and

and a second roller connected to the rack in front of the first roller and having a lower end positioned above a lower end of the first roller.
According to claim 12,

A diameter of the second roller is smaller than a diameter of the first roller.
According to claim 12,

The rotational center of the second roller is located higher than the rotational center of the first roller.
According to claim 12,

The rack is

A first wire extending along the front-back direction; and

And a third wire extending obliquely forward from the first wire,

The second roller,

A dishwasher disposed at a position where the first wire and the third wire intersect.