# US 2018/0020899 A1 · Batch-type warewasher with energy retaining curtain > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0020899 A1 - Document ID: US20180020899A1 - Status: Published application - Kind: A1 - Application number: 15/653,828 - Filed: 2017-07-19 - Published: 2018-01-25 - Earliest claimed: 2016-07-22 - Assignees: Illinois Tool Works Inc. - Applicants: Illinois Tool Works Inc. - Inventors: Alexander R. Anim-Mensah; Mary E. Paulus; Michael T. James; Zachary Siefker; Prasanna Venkatesh Murlidharan; Bandr Mohsin Alsubaie; Zaid Azmathullah Shaikh; Daryl Michael Osterloh; Adam Puccetti; Tarik Said Mohammed Alkharusi - Web page: https://patentgrep.com/patent/US20180020899A1 ## CPC - A47L 15/0076: {of non-domestic use type, e.g. commercial dishwashers for bars, hotels, restaurants, canteens or hospitals (machines specially adapted for drinking glasses A47L15/0065; drawer-type dishwashers A47L15/0084; in-sink dishwashers A47L15/0086; miniature dishwashers A47L15/0089; conveyor-type dishwashers A47L15/24; machines with crockery cleaned by brushes A47L15/37)} - A47L 15/0078: {with a plurality of fluid recirculation arrangements, e.g. with separated washing liquid and rinsing liquid recirculation circuits} - A47L 15/0081: {with vertical sliding closing doors, e.g. hood-type dishwashers} - A47L 15/4209: {Insulation arrangements, e.g. for sound damping or heat insulation} - A47L 15/4251: {Details of the casing (insulation arrangements A47L15/4209; collecting leaked water in the casing for preventing water damage A47L15/4212)} - A47L 15/4257: {Details of the loading door} - A47L 2401/26: Loading door status, e.g. door latch opened or closed state - A47L 2401/34: Other automatic detections - A47L 2501/26: Indication or alarm to the controlling device or to the user - A47L 2501/32: Stopping or disabling machine operation, including disconnecting the machine from a network, e.g. from an electrical power supply - A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08) ## Abstract A batch-type warewash machine includes a chamber for receiving wares to be cleaned, the chamber having a chamber access opening and a single spray zone, with at least one spray system for spraying liquid onto wares in the single spray zone. A door is movable between a closed position covering the chamber access opening and an open position away from the chamber access opening to allow wares to be moved in and out of the chamber. A curtain structure is mounted on the machine, the curtain structure located behind the door when the door is in the closed position. The curtain structure remains in position and at least partially covers the chamber access opening when the door is in the open position so as to retain hot moist air within the chamber when the door is moved to the open position upon completion of a ware cleaning cycle. ## Claims ### Claim 1 A batch-type warewash machine for washing wares, comprising: a housing defining a chamber for receiving wares to be cleaned and having a chamber access opening through which wares are moved into and out of the chamber, the chamber including a lower sump zone and an upper spray zone; a wash spray system including a pump and a wash liquid flow path for moving wash liquid from the sump along the wash liquid flow path to at least one wash spray arm with multiple wash spray nozzles for directing wash liquid sprays onto wares within the upper spray zone; a rinse spray system including a rinse spray flow path for delivering rinse liquid to at least one rinse arm with multiple rinse spray nozzles for directing rinse liquids sprays onto wares within the upper spray zone; a door mounted to the housing, the door movable between a closed position covering the chamber access opening and an open position away from the chamber access opening to allow wares to be moved in and out of the chamber; and a curtain structure mounted on the housing at the chamber access opening, the curtain structure positioned behind the door when the door is in the closed position, the curtain structure at least partially covering an upper part of the chamber access opening when the door is in the open position, the curtain structure comprising flexible material that enables wares to be moved in and out of the chamber access opening past the curtain structure. ### Claim 2 (depends on 1) The machine of claim 1 wherein the curtain structure includes an upper rigid portion and a lower flexible portion that incorporates the flexible material. ### Claim 3 (depends on 1) The machine of claim 1 wherein the curtain structure extends downward from an upper position proximate an upper edge of the chamber access opening to a lower position proximate a bottom edge of the chamber access opening. ### Claim 4 (depends on 1) The machine of claim 1 wherein the curtain structure extends downward from an upper position proximate an upper edge of the chamber access opening and terminates at a lower position that is higher than a bottom edge of the chamber access opening by at least four inches. ### Claim 5 (depends on 1) The machine of claim 1 wherein: the chamber lacks any opening, other than the chamber access opening, through which wares can be moved into and out of the chamber; and/or the chamber lacks any ware conveyance structure that moves wares during cleaning cycles; and/or the chamber lacks any spray zone, other than the upper spray zone, and both wash liquid sprays and rinse liquid sprays are directed onto wares that are stationary within the upper spray zone. ### Claim 6 (depends on 1) The machine of claim 1 wherein the flexible material comprises overlapping elongated strips of flexible material. ### Claim 7 (depends on 1) The machine of claim 1 wherein a bottom portion of the door is pivotably mounted to the housing such that the door pivots downward in order to move from the closed position, which is an upright position, to the open position which is a lateral position. ### Claim 8 (depends on 1) The machine of claim 1 wherein the door is slidingly mounted to the housing and shifts upward when moving from the closed position to the open position, and both the closed position and the open position are upright positions. ### Claim 9 (depends on 1) The machine of claim 1 wherein the curtain structure includes an upper mount frame, an intermediate rigid part extending downward from the upper mount frame and a lower flexible part extending downward from the intermediate rigid part. ### Claim 10 (depends on 1) The machine of claim 1 wherein a substantial majority of the curtain structure is comprised of transparent or at least translucent to enable some viewing of wares within the chamber from a position external of the machine when the door is in the open position. ### Claim 11 (depends on 1) The machine of claim 1 wherein the curtain structure is pivotably mounted to the housing. ### Claim 12 (depends on 1) The machine of claim 1 wherein the curtain structure is removable from the machine without the use of tools. ### Claim 13 (depends on 1) The machine of claim 1 wherein the curtain structure includes an elongated rigid upper mount part with end portions that slide down into opposed mount bracket slots on the housing. ### Claim 14 (depends on 1) The machine of claim 1 wherein a top most portion of the curtain structure is positioned at a height that is at or above a height of an upper wall of the chamber. ### Claim 15 A batch-type warewash machine for washing wares, comprising: a chamber for receiving wares to be cleaned, the chamber having a chamber access opening and a single spray zone, with at least one spray system for spraying liquid onto wares in the single spray zone; a door movable between a closed position covering the chamber access opening and an open position away from the chamber access opening to allow wares to be moved in and out of the chamber; a curtain structure mounted on the machine, the curtain structure located behind the door when the door is in the closed position, the curtain structure remaining in position and at least partially covering the chamber access opening when the door is in the open position so as to retain hot moist air within the chamber when the door is moved to the open position upon completion of a ware cleaning cycle. ### Claim 16 (depends on 15) The machine of claim 15 wherein the curtain structure includes an upper rigid portion and a lower flexible portion that permits wares to be moved in and out of the chamber. ### Claim 17 (depends on 15) The machine of claim 15 wherein the curtain structure extends downward from an upper position proximate an upper edge of the chamber access opening, and terminates at a lower position that is higher than a bottom edge of the chamber access opening. ### Claim 18 (depends on 15) The machine of claim 15 wherein the curtain structure lies in a plane that is substantially parallel to a pivot axis of the door or a sliding plane of the door. ### Claim 19 (depends on 15) The machine of claim 15 wherein, further comprising a controller and sensor, the controller configured to implement a door interlock for shutting down or pausing an ongoing cleaning cycle when the door is moved away from the closed position, wherein the curtain structure is removable, and wherein cleaning cycles remain enabled even upon removal of the curtain structure. ### Claim 20 (depends on 1) The machine of claim 1 wherein the curtain structure includes an elongated rigid upper mount part with end portions that slide down into opposed mount bracket slots on the housing.