# US 12,593,937 B2 · Multi-functional oven with air fryer capability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,593,937 B2 - Document ID: US12593937B2 - Status: Granted - Kind: B2 - Application number: 16/926,024 - Filed: 2020-07-10 - Published: 2022-01-13 - Granted: 2026-04-07 - Earliest claimed: 2020-07-10 - Assignees: Hamilton Beach Brands, Inc. - Applicants: Hamilton Beach Brands, Inc. - Inventors: William D Starr; Lynda Musante - Web page: https://patentgrep.com/patent/US12593937B2 ## CPC - A47J 37/0641: {with forced air circulation, e.g. air fryers} - A47J 36/32: Time-controlled igniting mechanisms or alarm devices - A47J 37/0664: {Accessories} - A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES ## Abstract A multi-functional oven includes: a housing having a floor, a rear wall, a ceiling, and first and second side walls; a door that serves as a front wall of the housing; an internal side wall that divides the housing into a cooking cavity and an control cavity; a removable cooking rack that defines a cooking surface; a lower heating element positioned in a lower region of the cooking cavity beneath the cooking surface; an upper heating element positioned in an upper region of the cooking cavity above the cooking surface; and a fan residing in a recirculation duct in the control cavity configured to draw air from the cooking cavity through lower vents located in a lower area of the internal side wall, thereby creating an airstream above and below the cooking surface that flows into the lower vents, and to force air from the control cavity through upper vents into the cooking cavity. ## Claims ### Claim 1 A multi-functional oven, comprising: a housing having a floor, a rear wall, a ceiling, and first and second side walls; a door that serves as a front wall of the housing; an internal side wall that divides the housing into a cooking cavity and a control cavity; a removable cooking rack that defines a cooking surface; a lower heating element positioned in a lower region of the cooking cavity beneath the cooking surface; an upper heating element positioned in an upper region of the cooking cavity above the cooking surface; a fan residing in a recirculation duct, the recirculation duct further comprising a shroud that surrounds the fan, the recirculation duct and the shroud located in the control cavity, the fan configured to draw air from the cooking cavity through one or more lower vents located in a lower area of the internal side wall, thereby creating an airstream below the cooking surface that flows into the lower vents, and to force air from the control cavity through upper vents into the cooking cavity; and a recirculation duct vent located in the recirculation duct, the vent including a flapper plate connected to the recirculation duct via a hinge, the flapper plate including a closed position wherein the flapper plate obstructs the recirculation duct vent below a predetermined pressure level and an open position wherein the recirculation duct vent is uncovered above a predetermined pressure magnitude, wherein the flapper plate actuates to the open position from the closed position when the fan operates and maintains the closed position when the fan does not operate. ### Claim 2 (depends on 1) The multi-functional oven defined in claim 1, wherein the fan comprises an air-directing member that rotates about an axis that is generally parallel with the internal side wall. ### Claim 3 (depends on 1) The multi-functional oven defined in claim 1, wherein the recirculation duct directs the air from the lower vents to the fan, and from the fan to the upper vents. ### Claim 4 (depends on 3) The multi-functional oven defined in claim 3, wherein the shroud includes an upper outlet and a lower outlet, each of the upper and lower outlets directing air from the fan into the cooking cavity. ### Claim 5 (depends on 3) The multi-functional oven defined in claim 3, further comprising a duct fluidly connected with the shroud that extends into an upper portion of the cooking cavity, and wherein the upper vents are located in the duct. ### Claim 6 (depends on 3) The multifunctional oven defined in claim 3, wherein the shroud includes a vent into the control cavity, and mounting of the cooking rack in the cooking cavity causes to the vent in the control cavity to open. ### Claim 7 (depends on 1) The multi-functional oven defined in claim 1, wherein the cooking rack includes a heat shield located below the cooking surface, and wherein the heat shield is positioned between the cooking rack and one of the lower heating elements. ### Claim 8 (depends on 1) The multi-functional oven defined in claim 1, further comprising a supplemental heating element. ### Claim 9 (depends on 8) The multi-functional oven defined in claim 8, further comprising a controller operatively connected with the lower heating element, the upper heating element, and the supplemental heating element, and wherein when a first cooking mode is selected, the controller activates the upper and lower heating elements, and wherein when a second cooking mode is selected, the controller activates the upper and lower heating elements and the supplemental heating element. ### Claim 10 (depends on 9) The multi-functional oven defined in claim 9, wherein in the second cooking mode, the controller activates the upper and lower heating elements to operate at less than full heating capacity. ### Claim 11 (depends on 1) The multi-functional oven defined in claim 1, wherein the cooking cavity has a height, a depth and a width, wherein the height is less than at least one of the depth and the width. ### Claim 12 (depends on 1) The multi-functional oven defined in claim 1, wherein the cooking rack and the internal side wall are configured so that mounting of the cooking rack in the cooking cavity engages a switch that enables the fan to operate. ### Claim 13 (depends on 1) The multifunctional oven defined in claim 1, wherein the cooking rack has a first feature, and the internal wall has a second mating feature, wherein engagement of the first and second features ensures that the cooking rack is mounted at the correct height. ### Claim 14 (depends on 1) The multifunctional oven defined in claim 1, wherein operation of the fan induces an airstream of between 15 and 25 cfm. ### Claim 15 (depends on 1) The multifunctional oven defined in claim 1, wherein the cooking cavity has a volume of between 0.5 and 1.5 cubic feet. ### Claim 16 (depends on 1) The multifunctional oven defined in claim 1, further comprising at least one baffle mounted across the cooking cavity from the internal wall. ### Claim 17 (depends on 1) The multifunctional oven defined in claim 1, wherein all of the lower vents are positioned below the cooking surface.