WO2020143681A1 - Ensemble tiroir à fermeture amortie pour appareil frigorifique ménager - Google Patents

Ensemble tiroir à fermeture amortie pour appareil frigorifique ménager Download PDF

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Publication number
WO2020143681A1
WO2020143681A1 PCT/CN2020/070967 CN2020070967W WO2020143681A1 WO 2020143681 A1 WO2020143681 A1 WO 2020143681A1 CN 2020070967 W CN2020070967 W CN 2020070967W WO 2020143681 A1 WO2020143681 A1 WO 2020143681A1
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WO
WIPO (PCT)
Prior art keywords
storage bin
support
side support
bin
drawer assembly
Prior art date
Application number
PCT/CN2020/070967
Other languages
English (en)
Inventor
Louis A. Wantland
Bagawathkumar Chellappan
Original Assignee
Qingdao Haier Refrigerator Co., Ltd.
Haier Smart Home Co., Ltd.
Haier Us Appliance Solutions, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Refrigerator Co., Ltd., Haier Smart Home Co., Ltd., Haier Us Appliance Solutions, Inc. filed Critical Qingdao Haier Refrigerator Co., Ltd.
Publication of WO2020143681A1 publication Critical patent/WO2020143681A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D25/00—Charging, supporting, and discharging the articles to be cooled
    • F25D25/02—Charging, supporting, and discharging the articles to be cooled by shelves
    • F25D25/024—Slidable shelves
    • F25D25/025—Drawers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B88/00—Drawers for tables, cabinets or like furniture; Guides for drawers
    • A47B88/40—Sliding drawers; Slides or guides therefor
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B88/00—Drawers for tables, cabinets or like furniture; Guides for drawers
    • A47B88/40—Sliding drawers; Slides or guides therefor
    • A47B88/453—Actuated drawers
    • A47B88/46—Actuated drawers operated by mechanically-stored energy, e.g. by springs
    • A47B88/467—Actuated drawers operated by mechanically-stored energy, e.g. by springs self-closing
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B88/00—Drawers for tables, cabinets or like furniture; Guides for drawers
    • A47B88/40—Sliding drawers; Slides or guides therefor
    • A47B88/453—Actuated drawers
    • A47B88/46—Actuated drawers operated by mechanically-stored energy, e.g. by springs
    • A47B88/467—Actuated drawers operated by mechanically-stored energy, e.g. by springs self-closing
    • A47B2088/4675—Actuated drawers operated by mechanically-stored energy, e.g. by springs self-closing with detent or emboss on slide
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2210/00—General construction of drawers, guides and guide devices
    • A47B2210/0091—Drawer movement damping
    • A47B2210/0094—Drawer damping device with 2 relatively movable parts to convert kinetic energy
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2210/00—General construction of drawers, guides and guide devices
    • A47B2210/17—Drawers used in connection with household appliances
    • A47B2210/175—Refrigerators or freezers

Definitions

  • the present subject matter relates generally to refrigerator appliances, and more particularly to soft close drawer assemblies for use in refrigerator appliances.
  • Refrigerator appliances generally include a cabinet that defines a chilled chamber for receipt of food articles for storage.
  • refrigerator appliances include one or more doors rotatably hinged to the cabinet to permit selective access to food items stored in chilled chamber (s) .
  • the refrigerator appliances can also include various storage components mounted within the chilled chamber and designed to facilitate storage of food items therein.
  • Such storage components can include racks, bins, shelves, or drawers that receive food items and assist with organizing and arranging of such food items within the chilled chamber.
  • Certain refrigerator appliances include storage bins that slide between an open and closed position to permit selective access to items stored therein. However, these storage bins are often difficult or cumbersome to close completely. In addition, if the storage bin is closed too quickly, the impact of the storage bin against its support frame generates a very loud closing noise and potentially causes damage or premature wear to one or more refrigerator components. Accordingly, certain refrigerator appliances include soft close mechanisms for slowly and completely closing the storage bin when desired. However, such soft close mechanisms are commonly incorporated within ball bearing drawer slides which are mounted on both sides of the storage bin and are very expensive.
  • a refrigerator appliance with features for improving the opening and closing of storage bins would be useful. More specifically, a drawer assembly including a low cost and effective soft close mechanism would be particularly beneficial.
  • a refrigerator appliance including a cabinet defining a chilled chamber, a door being operably coupled to the cabinet to provide selective access to the chilled chamber, and a drawer assembly positioned within the chilled chamber.
  • the drawer assembly includes a drawer support frame including a first side support and a second side support and a storage bin supported by the first side support and the second side support and being movable between an open position and a closed position.
  • a striker extends from a side of the storage bin and a soft close mechanism is mounted to the first side support and is configured for engaging the striker when the storage bin is moved toward the closed position.
  • a drawer assembly includes a drawer support frame including a first side support and a second side support and a storage bin supported by the first side support and the second side support and being movable between an open position and a closed position.
  • a striker extends from a side of the storage bin and a soft close mechanism is mounted to the first side support and is configured for engaging the striker when the storage bin is moved toward the closed position.
  • a drawer assembly including a drawer support frame including a first side support and a second side support and a storage bin supported by the first side support and the second side support and being movable between an open position and a closed position.
  • a striker extends from the first side support toward the storage bin and a soft close mechanism is mounted to a side of the storage bin and is configured for engaging the striker when the storage bin is moved toward the closed position.
  • FIG. 1 provides a perspective view of a refrigerator appliance according to an exemplary embodiment of the present subject matter.
  • FIG. 2 provides a perspective view of the exemplary refrigerator appliance of FIG. 1, with the doors of the fresh food chamber shown in an open position.
  • FIG. 3 provides a front view of a drawer assembly of the exemplary refrigerator appliance of FIG. 1 according to an exemplary embodiment of the present subject matter.
  • FIG. 4 provides a perspective view of the exemplary drawer assembly of FIG. 3 with the storage bins removed for clarity.
  • FIG. 5 provides a perspective cross sectional view of the exemplary drawer assembly of FIG. 3 according to an exemplary embodiment of the present subject matter.
  • FIG. 6 is a perspective view of a storage bin of the exemplary drawer assembly of FIG. 3 according to an exemplary embodiment of the present subject matter.
  • FIG. 7 is a perspective view of a striker on the exemplary storage bin of FIG. 6 according to an exemplary embodiment of the present subject matter.
  • FIG. 8 is a side view of a center support of the exemplary drawer assembly of FIG. 3 according to an exemplary embodiment of the present subject matter.
  • FIG. 9 is a cross sectional view of the storage bin supported by a support roller of the exemplary drawer assembly of FIG. 3 according to an exemplary embodiment of the present subject matter.
  • FIG. 10 is a perspective view of a soft close mechanism in an extended position for use with the exemplary drawer assembly of FIG. 3 according to an exemplary embodiment of the present subject matter.
  • FIG. 11 is a perspective view of a soft close mechanism in a retracted position for use with the exemplary drawer assembly of FIG. 3 according to an exemplary embodiment of the present subject matter.
  • FIG. 1 provides a perspective view of a refrigerator appliance 100 according to an exemplary embodiment of the present subject matter.
  • Refrigerator appliance 100 includes a cabinet or housing 102 that extends between a top 104 and a bottom 106 along a vertical direction V, between a first side 108 and a second side 110 along a lateral direction L, and between a front side 112 and a rear side 114 along a transverse direction T.
  • Each of the vertical direction V, lateral direction L, and transverse direction T are mutually perpendicular to one another, such that an orthogonal coordinate system is generally defined.
  • Housing 102 defines chilled chambers for receipt of food items for storage.
  • housing 102 defines fresh food chamber 122 positioned at or adjacent top 104 of housing 102 and a freezer chamber 124 arranged at or adjacent bottom 106 of housing 102.
  • refrigerator appliance 100 is generally referred to as a bottom mount refrigerator. It is recognized, however, that the benefits of the present disclosure apply to other types and styles of refrigerator appliances such as, e.g., a top mount refrigerator appliance, a side-by-side style refrigerator appliance, or a single door refrigerator appliance. Moreover, aspects of the present subject matter may be applied to other appliances as well, such as ovens, storage cabinets, etc. Consequently, the description set forth herein is for illustrative purposes only and is not intended to be limiting in any aspect to any particular appliance or configuration.
  • Refrigerator doors 128 are rotatably hinged to an edge of housing 102 for selectively accessing fresh food chamber 122.
  • a freezer door 130 is arranged below refrigerator doors 128 for selectively accessing freezer chamber 124.
  • Freezer door 130 is coupled to a freezer drawer (not shown) slidably mounted within freezer chamber 124.
  • Refrigerator doors 128 and freezer door 130 are shown in the closed configuration in FIG. 1.
  • FIG. 1 One skilled in the art will appreciate that other chamber and door configurations are possible and within the scope of the present invention.
  • FIG. 2 provides a perspective view of refrigerator appliance 100 shown with refrigerator doors 128 in the open position.
  • various storage components are mounted within fresh food chamber 122 to facilitate storage of food items therein as will be understood by those skilled in the art.
  • the storage components may include bins 134 and shelves 136. Each of these storage components are configured for receipt of food items (e.g., beverages and/or solid food items) and may assist with organizing such food items.
  • bins 134 may be mounted on refrigerator doors 128 or may slide into a receiving space in fresh food chamber 122. It should be appreciated that the illustrated storage components are used only for the purpose of explanation and that other storage components may be used and may have different sizes, shapes, and configurations.
  • Dispensing assembly 140 will be described according to exemplary embodiments of the present subject matter. Although several different exemplary embodiments of dispensing assembly 140 will be illustrated and described, similar reference numerals may be used to refer to similar components and features. Dispensing assembly 140 is generally configured for dispensing liquid water and/or ice. Although an exemplary dispensing assembly 140 is illustrated and described herein, it should be appreciated that variations and modifications may be made to dispensing assembly 140 while remaining within the present subject matter.
  • Dispensing assembly 140 and its various components may be positioned at least in part within a dispenser recess 142 defined on one of refrigerator doors 128.
  • dispenser recess 142 is defined on a front side 112 of refrigerator appliance 100 such that a user may operate dispensing assembly 140 without opening refrigerator door 128.
  • dispenser recess 142 is positioned at a predetermined elevation convenient for a user to access ice and enabling the user to access ice without the need to bend-over.
  • dispenser recess 142 is positioned at a level that approximates the chest level of a user.
  • Dispensing assembly 140 includes an ice dispenser 144 including a discharging outlet 146 for discharging ice from dispensing assembly 140.
  • An actuating mechanism 148 shown as a paddle, is mounted below discharging outlet 146 for operating ice or water dispenser 144.
  • any suitable actuating mechanism may be used to operate ice dispenser 144.
  • ice dispenser 144 can include a sensor (such as an ultrasonic sensor) or a button rather than the paddle.
  • Discharging outlet 146 and actuating mechanism 148 are an external part of ice dispenser 144 and are mounted in dispenser recess 142.
  • refrigerator door 128 may define an icebox compartment 150 (FIG. 2) housing an icemaker and an ice storage bin (not shown) that are configured to supply ice to dispenser recess 142.
  • control panel 152 is provided for controlling the mode of operation.
  • control panel 152 includes one or more selector inputs 154, such as knobs, buttons, touchscreen interfaces, etc., such as a water dispensing button and an ice-dispensing button, for selecting a desired mode of operation such as crushed or non-crushed ice.
  • inputs 154 may be used to specify a fill volume or method of operating dispensing assembly 140.
  • inputs 154 may be in communication with a processing device or controller 156. Signals generated in controller 156 operate refrigerator appliance 100 and dispensing assembly 140 in response to selector inputs 154.
  • a display 158 such as an indicator light or a screen, may be provided on control panel 152. Display 158 may be in communication with controller 156, and may display information in response to signals from controller 156.
  • processing device or “controller” may refer to one or more microprocessors or semiconductor devices and is not restricted necessarily to a single element.
  • the processing device can be programmed to operate refrigerator appliance 100, dispensing assembly 140 and other components of refrigerator appliance 100.
  • the processing device may include, or be associated with, one or more memory elements (e.g., non-transitory storage media) .
  • the memory elements include electrically erasable, programmable read only memory (EEPROM) .
  • EEPROM electrically erasable, programmable read only memory
  • the memory elements can store information accessible processing device, including instructions that can be executed by processing device.
  • the instructions can be software or any set of instructions and/or data that when executed by the processing device, cause the processing device to perform operations.
  • drawer assembly 200 which may be used with refrigerator appliance 100 will be described according to exemplary embodiments of the present subject matter. Specifically, drawer assembly 200 may be positioned within fresh food chamber 122 or freezer chamber 124 of refrigerator appliance 100, e.g., replacing one or more of bins 134 in FIG. 2. It should be appreciated that drawer assembly 200 is an exemplary embodiment of the present subject matter intended only for explaining aspects of the present subject matter and is not intended to limit the scope of the present subject matter in any manner.
  • drawer assembly 200 includes a drawer support frame 202 which is generally configured for supporting one or more storage bins 204, e.g., using a roller and guide rail assembly. More specifically, drawer support frame 202 includes a top frame 210, a left support wall 212, a center support wall 214, and a right support wall 216, each of which extend down from top frame 210.
  • top frame 210 may include a solid surface or pane of glass (not shown) , is intended to form a top of each storage bin 204, and may additionally be used as a shelf within refrigerator appliance 100.
  • Support walls 212-216 extend down from top frame 210 and are intended to support storage bins 204 while permitting a user to slide storage bins 204 between an open position to access food items positioned therein and a closed position when not in use or when doors 120 are closed.
  • drawer assembly 200 could instead include a single storage bin 204 or may include storage bins that are stacked adjacent each other along the vertical direction V.
  • drawer support frame 202 and storage bins 204 may have any other suitable size or configuration.
  • drawer assembly 200 as described herein is designed such that storage bins 204 may be identical and interchangeable between the left hand and right hand side of drawer support frame 202.
  • drawer assembly 200 and its components may be formed from any material which is sufficiently rigid to support the weight of storage bins 204 or other supported items.
  • drawer support frame 202 and storage bins 204 may be formed by injection molding, e.g., using a suitable plastic material, such as injection molding grade high impact polystyrene (HIPS) or acrylonitrile butadiene styrene (ABS) .
  • HIPS high impact polystyrene
  • ABS acrylonitrile butadiene styrene
  • these components may be compression molded, e.g., using sheet molding compound (SMC) thermoset plastic.
  • some or all of drawer support frame 202 and storage bins 204 may be formed from stamped metal, acrylic glass, or any other suitable material or combination thereof.
  • FIGS. 3 and 4 illustrate drawer assembly 200 as having two storage bins positioned adjacent each other
  • exemplary embodiments of the present subject matter include a single storage bin configuration.
  • drawer support frame 202 will be described as including a first side support 220 and a second side support 222 which are spaced apart along the transverse direction T for receiving storage bin 204.
  • first side support 220 may generally correspond with center support wall 214
  • a second side support 222 may generally correspond with either left support wall 212 or right support wall 216 as shown in FIGS. 3 and 4.
  • second side support 222 may be defined by a sidewall of fresh food compartment 122 instead of extending vertically from top frame 210.
  • first side support 220 may define a support rail 230 which protrudes or extends from the first side support 220 toward storage bin 204, e.g., along the lateral direction L.
  • support rail 230 generally extends along substantially an entire depth of drawer support frame 202, e.g., from a front 232 of drawer support frame 202 to a rear 234 of drawer support frame 202 along the transverse direction T. It should be appreciated that as used herein, terms of approximation, such as “approximately, ” “substantially, ” or “about, ” refer to being within a ten percent margin of error.
  • support rail 230 may have any suitable shape or profile suitable for facilitating the opening and closing of storage bin 204.
  • support rail 230 may include a flat portion 236 which extends substantially parallel to the transverse direction T and an angled portion 238 which is angled relative to the transverse direction T at a guide angle 240.
  • flat portion 236 may be defined proximate a front 232 of support frame 202 such that storage bin 204 extends substantially within a horizontal plane as it approaches the open position.
  • angled portion 238 may be designed to facilitate closing of storage bin 204 by encouraging storage bin 204 to roll down on angled portion 238 under the force of gravity as it approaches the closed position.
  • the guide rail and roller assembly may further include a bin roller 242 which is rotatably mounted on a side 244 of storage bin 204 for rolling along support rail 230 as storage bin 204 moves between the open position and the closed position. More specifically, bin roller 242 may be mounted proximate a rear 246 of storage bin 204.
  • drawer assembly 200 may further include a rear stop 248 positioned proximate rear 234 of support frame 202 and a front stop 250 positioned proximate front 232 of support frame 202. In this manner, bin roller 242 may be configured for engaging or seating against rear stop 248 when in the fully closed position and may be prevented from pulling out of support frame 202 by front stop 250 when in the fully extended or open position.
  • side 244 of storage bin 204 may define a bin guide rail 252 that protrudes toward first side support 220, e.g., substantially along the lateral direction L.
  • a support roller 254 may be rotatably mounted to first side support 220 proximate front 232 of support frame 202 for supporting bin guide rails 252 as storage bin 204 moves between the open position and the closed position. It should be appreciated that a similar guide rail and roller assembly may be included proximate a second side support 222. In this manner, storage bin 204 is fully supported along the lateral direction L and the transverse direction T.
  • support roller 254 supports bin guide rail 252 proximate front 232 of storage bin 204 and support rail 230 support bin roller 242 proximate rear 234 of storage bin 204.
  • drawer assembly 200 may further include an upper rail 260 that is defined by first side support 220 and defines a top surface 262 and a bottom surface 264.
  • upper rail 260 is spaced apart from and extends parallel to support rail 230 to define a roller slot 266. More specifically, roller slot 266 is defined between a top surface of support rail 230 and bottom surface 264 of upper rail 260.
  • Bin roller 242 may be received within roller slot 266 to prevent too much wobble or vertical movement of storage bin 204 within roller slot 266.
  • a distal end of one or both of support rail 230 and upper rail 260, a retention lip 268 may be defined for retaining bin roller 242 within roller slot 266.
  • first gap 270 is defined between storage bin 204 and first side support 220 along the lateral direction L and a second gap 272 is defined between storage bin 204 and second side support 222 along the lateral direction L.
  • first gap 270 is smaller than second gap 272.
  • first gap 270 may be less than about 0.1 millimeters less than about 0.075 millimeters, or smaller.
  • second gap 272 may be greater than 1 mm, greater than 2 millimeters, or larger.
  • the support rail 230 and bin guide rail 252 may be wider to support the lateral variation of storage bin 204 within support frame 202 proximate second side support 222.
  • retention lip 268 is configured for slidably receiving and retaining bin roller 242 proximate first side support 220, thereby substantially fixing its lateral position.
  • assembly 200 may further include a striker 280 which extends from side 244 of storage bin 204 toward first side support 220.
  • drawer assembly 200 may include a soft close mechanism 282 which is mounted to the first side support 220 and is configured for engaging striker 280 when storage bin 204 is moved toward the closed position.
  • striker 280 and soft close mechanism 282 may be reversed.
  • striker 280 may extend from first side support 220 and soft close mechanism 282 may be mounted on storage bin 204.
  • soft close mechanism is intended to refer to devices, mechanisms, or assemblies which are designed to act as a damper to slow the velocity of the closing drawer or storage bin while also engaging the storage bin and moving it into a fully closed position.
  • soft close mechanism 282 is mounted to top surface 262 of upper rail 260 and is mounted at an extension angle 284 relative to the transverse direction T.
  • extension angle 284 is substantially equivalent to guide angle 240 such that soft close mechanism 282 will remain engaged with striker 280 as storage bin 204 moves toward the closed position.
  • striker 280 generally defines a rear face or striking face 286 and a front face or locking face 288.
  • soft close mechanism 282 defines a pivoting head 290 mounted on the distal end of a piston rod 292. Piston rod 292 is slidable along the transverse direction T within a cylinder assembly 294 which provides the damping and retraction forces to piston rod 292.
  • striking face 286 of striker 280 impacts a first face 296 of pivoting head 290.
  • pivoting head 290 pivots relative to piston rod 292 such that a second face 298 of pivoting head 290 engages locking face 288 of striker 280.
  • striking face 286 and locking face 288 of striker 280 are sandwiched between first face 296 and second face 298 of pivoting head 290 such that storage bin 204 moves with pivoting head 290 along the transverse direction T.
  • cylinder assembly 294 may act to damp the closing motion of storage bin 204 via piston rod 292. Simultaneously, cylinder assembly 294 may draw storage bin 204 into the fully closed position.
  • Piston rod 292 may be configured for remaining in the extended position until a subsequent closing process of storage bin 204. It should be appreciated that the soft close mechanism described is only exemplary and that other soft close mechanisms may be used according to alternative embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Refrigerator Housings (AREA)
  • Drawers Of Furniture (AREA)

Abstract

L'invention concerne un ensemble tiroir pour un appareil frigorifique ménager, l'ensemble tiroir comprenant un cadre (202) de support de tiroir comportant une paroi de support gauche (212), une paroi de support centrale (214) et une paroi de support droite (216). Un compartiment de stockage (204) est positionné de chaque côté de la paroi de support centrale (214) et porté par le cadre (202) de support de tiroir à l'aide d'un ensemble rouleau (242) et rail de guidage (252). Chaque compartiment de stockage (204) définit un percuteur (280) s'étendant vers la paroi de support centrale (214), et un mécanisme de fermeture amortie (282) est positionné de chaque côté de la paroi de support centrale (214) afin d'entrer en prise avec les percuteurs (280) et d'effectuer une manœuvre de fermeture amortie des compartiments de stockage (204).
PCT/CN2020/070967 2019-01-11 2020-01-08 Ensemble tiroir à fermeture amortie pour appareil frigorifique ménager WO2020143681A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16/245,380 US20200224959A1 (en) 2019-01-11 2019-01-11 Soft close drawer assembly for a refrigerator appliance
US16/245,380 2019-01-11

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Publication Number Publication Date
WO2020143681A1 true WO2020143681A1 (fr) 2020-07-16

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