FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
AND
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
“AN AIR DUCT ASSEMBLY DEPLOYED IN A FOOD
PROCESSOR”
I/We, Bajaj Electricals Limited, an Indian National, of 45/47, Veer Nariman Road, Fort, Mumbai 400001, Maharashtra India.
The following specification particularly describes the invention and the manner in which it is to be performed.

The present application is a divisional patent application which claims benefit of Indian Provisional Patent Application No. 202321001390 filed on 06th January 2023.
FIELD OF THE INVENTION
5 The present invention generally relates to the field of food processors. More particularly, the present invention relates to an air duct assembly deployed in a food processor, for internal cooling of the food processor during operations thereof.
BACKGROUND OF THE INVENTION
10 Th i s se c t ion i s i n te n de d t o prov ide infor ma t ion r e l at i ng to t h e field of the invention and thus any approach or functionality described below should not be assumed to be qualified as prior art merely by its inclusion in this section.
A variety of food processors are known in the food processor industry, to be employed in the household, to perform grinding, mixing and blending operations
15 on various food and/or edible ingredients. A mixer grinder includes a processing unit and a jar unit, wherein the jar unit carries food articles and may be detachably connected to the processing unit, to perform processing of the food articles therein. The processing unit includes a main housing, a motor assembly housed within the main housing, and a cutter assembly connected to a motor of the motor
20 assembly, such that the cutter assembly is driven by the motor assembly for performing processing operations thereof.
During operation, a lot of heat is generated within the main housing, and therefore, a motor cooling assembly is deployed in the processing unit, for cooling and dissipation of heat from the motor assembly. Particularly, each of the motor 25 assembly and the motor cooling assembly are positioned within the main housing, while the motor cooling assembly performs cooling of the motor of the motor assembly during operations thereof. Notably, the main housing of the processing

unit defines a bottom air inlet for receiving ambient air, and a pair of circumferential outlets for exiting hot air from the main housing. Typically, the motor cooling assembly includes a fan coaxially connected to a motor shaft extending from the motor, and an air duct assembly positioned around a top 5 portion of the motor.
The conventionally known air duct assembly comprises a bottom opening for receiving ambient air, and a pair of duct outlets through which the hot air, after cooling, is vented outwards of the air duct assembly. In operation, upon activation of the motor, the fan intakes ambient air through the bottom air inlet of the main
10 housing, thereafter, passes it around the motor for cooling the same, and then passes it through the air duct assembly, to be finally vent through the pair of circumferential outlets in the main housing. Notably, within the air duct assembly, the hot air enters the air duct assembly through a bottom opening thereof, and thereafter, the hot air is circulated within the air duct assembly, and is finally vent
15 out through the pair of duct outlets.
It may be noted that the air duct assembly plays a vital role in venting the hot air from the main housing, and therefore, a structure and arrangement of the air duct assembly is required to be optimized, to enable noise reduction, enhance airflow for enhancing cooling of the motor assembly. Particularly, the conventional air
20 duct assembly is provided with the pair of duct outlets, such that one portion of the hot air, while circulating within the air duct assembly, is vent through a first duct outlet; and another portion of the hot air, while circulating within the air duct assembly, is vent through a second duct outlet. This creates a turbulence in the flow of air within the air duct assembly, which adds up to the noise in operation
25 of the food processor. Additionally, yet another portion of the hot air may not be vented outwards from either of pair of duct outlets, and recirculate within the air duct assembly, which may cause a backflow within the main housing, causing reduced amount of air capacity therein, and thus reduce the overall cooling

capacity of the motor cooling assembly.
Therefore, in view of the aforementioned limitations and drawbacks existing in the art, there is a well‐felt need to provide an improved air duct assembly deployed in the food processor, for efficiently as well as noiselessly venting the 5 hot air out of the main housing, via the air duct assembly, thereby facilitating efficient cooling of the motor within the food processor, which the present disclosure aims to address.
SUMMARY OF THE INVENTION
This section is intended to introduce certain aspects of the disclosed system in a 10 simplified form, and is not intended to identify the key advantages or features of the present disclosure.
The present disclosure relates to an air duct assembly deployed in a motor cooling assembly of a food processor, comprising: a first duct member; and a second duct member, wherein the first duct member is attached with the second duct 15 member, to integrally define a duct outlet between a first wall and a second wall thereof, such that each of the first wall and the second wall form an angle (α) of 50 degrees or above, relative to a central line passing through a middle of the duct outlet.
According to an aspect of the present disclosure, the air duct assembly comprises 20 an interior region having an involute profile for efficient circulation of hot air therein.
According to another aspect of the present disclosure, the air duct assembly comprises a duct inlet for receiving hot air therein.
According to yet another aspect of the present disclosure, the first duct member
25 defines a top surface defining a ring section and an extension section extending
therefrom, such that one edge of the extension section extends tangentially from

the ring section, while the other edge thereof extends at an inclination from the ring section.
According to yet another aspect of the present disclosure, the ring section of the top surface defines a cylindrical member extending vertically upwards from a 5 centre thereof.
According to yet another aspect of the present disclosure, the first duct member defines a top half‐wall surface extending from a periphery of the top surface, the top‐half wall surface defining: a circular top half‐wall section; and an extension top half‐wall section, wherein the circular top half‐wall section extends downwards 10 from the ring section of the top surface, while the extension top half‐wall section extends downwards from edges of the extension section of the top surface.
According to yet another aspect of the present disclosure, the second duct member defines a bottom surface comprising a planar bottom surface and an inclined bottom surface extending therefrom.
15 According to yet another aspect of the present disclosure, the planar bottom surface defines a ring section and an extension section extending therefrom, such that one edge of the extension section extends tangentially from the ring section, while another edge thereof extends at an inclination from the ring section.
According to yet another aspect of the present disclosure the second duct member 20 defines a bottom half‐wall surface extending from a periphery of the bottom surface, the bottom half‐wall surface defining: a circular bottom half‐wall section; and an extension bottom half‐wall section, wherein the circular bottom half‐wall section extends upwards from the ring section of the planar bottom surface, while the extension bottom half‐wall section extends upwards from edges of the 25 extension section of the planar bottom surface.
According to yet another aspect of the present disclosure, the first duct member

and the second duct member are attached to each other, such that the extension top half‐wall section and the extension section defined in the first duct member, and the inclined bottom surface and the extension bottom half‐wall section defined in the second duct member, integrally define the duct outlet 5 therebetween.
According to yet another aspect of the present disclosure, a combination of the extension top half‐wall section defined in the first duct member and the extension bottom half‐wall section defined in the second duct member, define the first wall and the second wall.
10 According to yet another aspect of the present disclosure, the interior region is defined between the ring section defined in the first duct member and the ring section defined in the second duct member.
According to yet another aspect of the present disclosure, the air duct assembly comprises a central wall extending parallel to the first wall and the second wall of 15 the duct outlet, from the middle of the duct outlet.
According to yet another aspect of the present disclosure, the food processor comprises a processing unit including: a main housing; a motor assembly; and the motor cooling assembly, wherein the motor assembly is fixedly housed and positioned within the main housing, while the motor cooling assembly is installed 20 on the motor assembly, to be positioned within the main housing.
According to still another aspect of the present disclosure, the main housing of the food processor comprises an upper part and a lower part, such that the upper part defines a pair of air outlets on a circumference thereof, while the lower part defines an air inlet on a bottom surface thereof.
25 According to still another aspect of the present disclosure, the air duct assembly is installed above the motor assembly, such that each of the duct inlet and the

duct outlet of the air duct assembly, is aligned with each of the air inlet and the pair of air outlets, respectively, to efficiently vent out hot air from the main housing of the food processor.
BRIEF DESCRIPTION OF DRAWINGS
5 In order to explain the technical solution in the embodiments of the present application more clearly, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application. For those skilled in the art, without any creative work, other drawings can be obtained based on these
10 drawings.
Figure 1 illustrates a first perspective view of the food processor, in accordance with the concepts of the present disclosure.
Figure 2 illustrates a second perspective view of the mixer grinder of Figure 1, in accordance with the concepts of the present disclosure.
15 Figure 3a illustrates a sectional side view of the mixer grinder of Figure 1, in accordance with a first embodiment of the present disclosure.
Figure 3b illustrates an exploded view of the mixer grinder of Figure 3a, in accordance with the first embodiment of the present disclosure.
Figure 4a illustrates a sectional side view of the mixer grinder of Figure 1, in 20 accordance with a second embodiment of the present disclosure.
Figure 4b illustrates an exploded view of the mixer grinder of Figure 4a, in accordance with the second embodiment of the present disclosure.
Figure 5a illustrates of a perspective view of an air duct assembly deployed in the mixer grinder, in accordance with the first embodiment of the present disclosure.
25 Figure 5b illustrates of a bottom view of the air duct assembly of Figure 5a, in

accordance with the first embodiment of the present disclosure.
Figure 6a illustrates of an exploded view of an air duct assembly deployed in the mixer grinder, in accordance with the second embodiment of the present disclosure.
5 Figure 6b illustrates of an assembled side view of the air duct assembly of Figure 6a, in accordance with the second embodiment of the present disclosure.
Figure 7 illustrates a tabulation of comparative test results drawing a comparison between the mixer grinder employing the air duct assembly, in accordance with the first embodiment of the present disclosure, and the mixer grinder not 10 employing the air duct assembly i.e., prior art.
Figure 8 illustrates a tabulation of comparative test results drawing a comparison between the mixer grinder employing the air duct assembly, in accordance with the second embodiment of the present disclosure, and the mixer grinder not employing the air duct assembly i.e., prior art.
15 DETAILED DESCRIPTION OF THE INVENTION
In the following description, for the purposes of explanation, various specific details are set forth in order to provide a thorough understanding of the preferred embodiment of the present invention. It will be apparent, however, that the embodiments of the present invention may be manufactured without these
20 specific details. Several features described hereinafter can each be used independently of one another or with any combination of other features. An individual feature may not address any of the problems discussed above or might address only one of the problems discussed above. Some of the problems discussed above might not be full address by any of the features described herein.
25 Exemplified embodiments of the present invention are described below, as illustrated in various drawings in which like reference numerals refer to the same

parts throughout the different drawings. It may be understood that some of the components described in the present disclosure may not be illustrated in the accompanying exemplary drawings, and therefore, are not associated with any reference numeral.
5 The embodiments of the present invention relate to an air duct assembly [126, 126’] deployed in a food processor [100], for efficiently and noiselessly venting hot air from a main housing [106] of the food processor [100]. Hereinafter, the term ‘food processor [100]’ may be interchangeably referred to as ‘mixer grinder [100]’, merely for exemplary purposes, and the same shall not be construed to impose
10 any limitations, whatsoever, on the scope of the present invention.
Figures 1 and 2 illustrate a first perspective view and a second perspective view of the mixer grinder [100], respectively, in accordance with the concepts of the present disclosure. Figures 1 and 2 are to be viewed in conjunction with each other, in order to better understand the concepts of the present disclosure. In light
15 of the aforementioned accompanying drawings, a structure and arrangement of the mixer grinder [100] is elucidated hereunder, for ease in understanding of a reader. The mixer grinder [100] comprises of a processing unit [102] and a jar unit (not shown). The jar unit comprises a cutter assembly (not shown), and is capable of carrying the food articles therein. The jar unit can be arranged with the
20 processing unit [102], such that the processing unit [102] drives the cutter assembly of the jar unit, to perform processing of the food articles therein.
Figures 3a and 3b illustrates a sectional side view and an exploded view of the mixer grinder [100] of Figure 1, in accordance with a first embodiment of the present disclosure, respectively, while figures 4a and 4b illustrates a sectional side 25 view and an exploded view of the mixer grinder [100] of Figure 1, in accordance with a second embodiment of the present disclosure, respectively. Hereinafter, while referring to the aforementioned figures, a structure and arrangement of the processing unit [102] of the mixer grinder [100] will be described in detail.

The processing unit [102] comprises a main housing [106], a motor assembly [108], and a motor cooling assembly [110]. The motor assembly [108] and the motor cooling assembly [110] are housed within the main housing [106], while the motor cooling assembly [110] is adapted to cool a motor [120] of the motor assembly 5 [108] during its operation. Particularly, the motor assembly [108] is fixedly housed and positioned within the main housing [106], while the motor cooling assembly [110] is installed on the motor assembly [108], to be positioned within the main housing [106]. A detailed understanding of the main housing [106] is provided hereunder for ready reference of the reader.
10 The main housing [106] is formed of an upper part [112] and a lower part [114]. The upper part [112] and the lower part [114] of the main housing [106] are suitably arranged with each other, to house each of the motor assembly [108] and a motor cooling assembly [110] therein. The lower part [114] further defines an air inlet [116] on a bottom thereof, while the upper part [112] defines a pair of air
15 outlets [118] on a circumference thereof. Notably, the motor cooling assembly [110] intakes ambient air through the air inlet [116] defined in the lower part [114] of the main housing [106], and vents hot air to external environment through the pair of air outlets [118] defined in the upper part [112] of the main housing [106].
As may be known to a person skilled in the art, the motor assembly [108] is fixedly 20 installed within the main housing [106], such that the motor assembly [108] extends at least partially within the upper part [112] and partially within the lower part [114]. The motor assembly [108] includes a motor [120] and a motor shaft [122] extending therefrom. Further, a drive motor coupler is attached to the motor shaft [122], to transmit a rotational motion of the motor [120] of the motor 25 assembly [108] to the cutter assembly of the jar unit, when engaged therewith. A structure and arrangement of the motor cooling assembly [110] will be described hereinafter in detail.
The motor cooling assembly [110] is provided within the processing unit [102] of

the mixer grinder [100], to air‐cool the motor assembly [108]. The motor cooling assembly [110] comprises a fan [124] and an air duct assembly [126, 126’]. The fan [124] is installed on the motor shaft [122] of the motor [120], for receiving and generating an airflow around the motor [120] of the motor assembly [108]. The 5 air duct assembly [126, 126’] is installed, on top of the motor assembly [108], within the main housing [106], and is primarily adapted to vent hot air from the main housing [106].
Particularly, the fan [124] of the motor cooling assembly [110] intakes ambient air through the air inlet [116] of the main housing [106], passes it around the motor 10 [120], for cooling the same, and thereafter passes the hot air through the air duct assembly [126, 126’] to be finally vent through the pair of air outlets [118] of the main housing [106]. Further, the air duct assembly [126, 126’] is also adapted to circulate the hot air therein, and efficiently vent the hot air therefrom, to improve cooling efficiency of the motor cooling assembly [110] of the mixer grinder [100].
15 Figure 5a illustrates of a perspective view of an air duct assembly [126] deployed in the mixer grinder, in accordance with the first embodiment of the present disclosure. Figure 5b illustrates of a bottom view of the air duct assembly [126] of Figure 5a, in accordance with the first embodiment of the present disclosure. Figures 5a and 5b are to be viewed in conjunction with the following paragraphs
20 of the present disclosure. Accordingly, in light of the aforementioned accompanying drawings, a detailed elucidation pertaining to the installation of the air duct assembly [126] i.e., the first embodiment of the present invention, within the main housing [106] is provided hereunder for ease of understanding of the reader.
25 The air duct assembly [126] is a single‐member structure installed on an internally extended portion (not shown) of lower part [114] of the main housing [106] (as seen from figure 1c), such that the air duct assembly [126] at least partially surrounds the motor assembly [110]. Particularly, the air duct assembly [126]

defines a plurality of attachment regions [128] that can be fixedly attached to the internally extended portion of lower part [114] of the main housing [106], to fixedly install the air duct assembly [126] thereon, thereby surrounding at least a portion of the motor assembly [110].
5 An attachment means between the plurality of attachment regions [128] of the air duct assembly [126] and the internally extended portion of the lower part [114] of the main housing [106] may include one of a screw attachment, a rivet attachment, a bolt attachment, an adhesive attachment, and combinations thereof. By virtue of the present disclosure, a person skilled in the art may be
10 motivated to employ any other conventionally known attachment means between the plurality of attachment regions [128] of the air duct assembly [126] and the internally extended portion of the lower part [114] of the main housing [106], and the same is encompassed within the scope of the present disclosure.
With such an arrangement of the air duct assembly [126] within the main housing 15 [106], a cavity is formed between the inner periphery of the lower part [114] of the main housing [106] and the air duct assembly [126]. Next, the structure and arrangement of the air duct assembly [126] and various features thereof will be described in detail.
The air duct assembly [126] is a single‐member structure having an inverted 20 container‐type shape. Particularly, the air duct assembly [126] comprises a defined profile of a central ring profile (not shown), and an extended profile (not shown) extending from a section of circumference of the central ring profile. In the preferred embodiment, the air duct assembly [126] defines a top surface [212] , and a wall surface [214 ] exte nding from a pe rip he ry of the top surface [212].
25 The top surface [212] defines a planar top surface [212a] having a ring‐shaped structure, and an inclined top surface [212b] having a flap‐type structure, such that the inclined top surface [212b] is inclined outwards relative to the planar top

surface [212a]. Notably, each of the planar top surface [212a] and the inclined top surface [212b] are integrally formed, to define a singular continuous face of the top surface [212]. Although, the present disclosure describes the planar top surface [212a] and the inclined top surface [212b] as separate surfaces inclined 5 with each other, it may be understood that in an embodiment, the planar top surface [212a] and the inclined top surface [212b] may be planar, and extend in a singular plane.
The wall surface [214] of the air duct assembly [126] extends downwards from at least a portion of periphery of the top surface [212]. The wall surface [214] defines
10 a curved wall‐section [214a], a first wall [222a], and a second wall [222b], each of which extends downwards from at least a portion of the periphery of the top surface [212]. The curved wall‐section [214a] extends downwards from a periphery of the planar top surface [212a], while the first wall [222a] extends tangentially from one end of the curved wall‐section [214a], and the second wall
15 [222b] extends tangentially from another end of the curved wall‐section [214a].
More particularly, the first wall [222a] extends downwards from one side of the inclined top surface [212b], while the second wall [222b] extends downwards from another side of the inclined top surface [212b], such that the first wall [222a] and the second wall [222b] define a duct outlet [222] of the air duct assembly [126]
20 therebetween. Furthermore, each of the first wall [222a] and the second wall [222b] is inclined outwards relative to a plane perpendicular to the top surface [212]. Additionally, the second wall [222b] defines a stopper portion [226] extending therefrom, towards an interior region [224] of the air duct assembly [126]. Notably, the interior region [224] has an involute profile for efficient
25 circulation of hot air therein, and is defined between the planar top surface [212a] of the top surface [212] and the curved wall section [214a] of the wall surface [214].
With the aforementioned structure, the air duct assembly [126] defines a duct

inlet [220] defined by a bottom opening thereof, for receiving hot air therein, and the duct outlet [222] defined by a peripheral opening thereof. Notably, the duct outlet [222] is defined by the opening between the first wall [222a] and the second wall [222b]. Notably, each of the first wall [222a] defining a first point of the duct
5 outlet [222] and the second wall [222b] defining a second point of the duct outlet [222], are inclined at an angle (α) in a range of 40° to 60°, relative to a central line passing through a middle of the duct outlet [222]. In the preferred embodiment, the angle (α) between each of the first point of the duct outlet [222] defined by the first wall [222a] and the second point of the duct outlet [222] defined by the
10 second wall [222b], relative to the central line passing through the middle of the duct outlet [222], is 50°.
In an assembled state i.e., when the air duct assembly [126] is installed above the motor assembly [108], each of the duct inlet [220] and the duct outlet [222] of the air duct assembly [126] is aligned with each of the air inlet [116] and the pair of air
15 outlets [118], respectively, to efficiently vent hot air from the main housing [106] of the food processor [100]. In an alternate embodiment, in addition to the above, the duct outlet [222] further defines a central separation wall (not shown) along the central line passing through the middle of the duct outlet, capable of splitting the duct outlet [222] into a two‐part structure, for enhanced air flow rate
20 therethrough.
In assembly, the air duct assembly [126] is fixedly attached to the internally extended portion of lower part [114] of the main housing [106], by employing an attachment means to fasten the plurality of attachment regions [128] on to the internally extended portion of lower part [114] of the main housing [106], thereby 25 surrounding at least a portion of the motor assembly [110] housed within the main housing [106]. Various types of the attachment means, disclosed earlier in the present disclosure, are not repeated herein for the sake of brevity.
Figure 6a illustrates of an exploded view of an air duct assembly [126’] deployed

in the mixer grinder, in accordance with the second embodiment of the present disclosure. Figure 6b illustrates of an assembled side view of the air duct assembly [126’] of Figure 6a, in accordance with the second embodiment of the present disclosure. Figures 6a and 6b are to be viewed in conjunction with the following 5 paragraphs of the present disclosure. Accordingly, basis the aforementioned accompanying drawings, a detailed elucidation of the air duct assembly [126’] i.e., the second embodiment of the present invention, is provided hereunder, for ease of understanding of the reader.
The air duct assembly [126’] is a two‐member assembly comprising a first duct
10 member [202’] and a second duct member [204’]. Each of the first duct member [202’] and the second duct member [204’] are container‐shaped structures suitably arranged with each other to form the air duct assembly [126’]. Particularly, each of the first duct member [202’] and the second duct member [204’] includes one or more snap members, such that the one or more snap
15 members on one of the first duct member [202’] and the second duct member [204’] can be snapped with corresponding one or more snap members on other of the first duct member [202’] and the second duct member [204’], to assemble the air duct assembly [126’]. In alternate embodiments, each of the first duct member [202’] and the second duct member [204’] can be attached to each other, to form
20 the air duct assembly [126’], by means of any fastening means including, but not limited to weld attachment means, rivet attachment means, screw attachment means, and the like. Other conventionally known means may be employed for such purposes, as may be envisioned by a person skilled in the art, and the same lies within the scope of the present invention. Now, the structure and various
25 features of the first duct member [202’] of the air duct assembly [126’] will be described in detail.
The first duct member [202’] includes a defined profile of a central ring profile (not shown), and an extended profile (not shown) extending from a section of

circumference of the central ring profile. In particular, the first duct member [202’] defines a top surface [206’], and a top half‐wall surface [208’] extending from a periphery of the top surface [206’]. Particularly, the top surface [206’] is defined by a ring section [206a’], and an extension section [206b’] extending from a section
5 of circumference of the ring section [206a’], such that one edge of the extension section [206b’] extends tangentially from one portion of circumference of the ring section [206a’], while another edge of the extension section [206b’] extends at an inclination, from another portion of circumference of the ring section [206a’]. Notably, the ring section [206a’] and the extension section [206b’] integrally form
10 a single continuous top surface [206’] of the first duct member [202’].
Furthermore, the top half‐wall surface [208’] defines a circular top half‐wall section [208a’] and an extension top half‐wall section [208b’]. Notably, the circular top half‐wall section [208a’] extends downwards from the ring section [206a’] of the top surface [206’], while the extension top half‐wall section [208b’] extends
15 downwards from edges of the extension section [206b’] of the top surface [206’]. As seen from figures 2a and 2b, it may be clear to a reader that the extension top half‐wall section [208b’] does not extend from a face of the extension section [206b’]. Notably, the circular top half‐wall section [208a’] and the extension top half‐wall section [208b’] integrally form a single continuous top half‐wall surface
20 [208’] of the first duct member [202’]. Moreover, the ring section [206a’] of the top surface [206’] defines a cylindrical member [210’] extending vertically upwards from a centre thereof, as seen from figures 2a and 2b, which is covered during assembly of the motor cooling assembly [110]. Next, a structure and various features of the second duct member [204’] of the air duct assembly [126’]
25 will be described in detail.
Similar to the construction of the first duct member [202’], as elaborated hereinabove, the second duct member [204’] also includes a defined profile of a central ring profile (not shown), and an extended profile (not shown) extending

from a section of circumference of the central ring profile. More particularly, the second duct member [204’] defines a bottom surface [212’], and a bottom half‐ wall surface [214’] extending from a periphery of the bottom surface [212’].
The bottom surface [212'] is a combination of a planar bottom surface [216’], and
5 an inclined bottom surface [218’] extending from the planar bottom surface
[216’]. Further, the planar bottom surface [216’] defines a ring section [216a’] and
an extension section [216b’] extending therefrom. Notably, one edge of the
extension section [216b’] extends tangentially from the ring section [216a’], while
another edge thereof extends at an inclination from the ring section [216a’]. The
10 ring section [216a’] and the extension section [216b’] integrally form a single
continuous planar bottom surface [216’] of the bottom surface [212’] of the
second duct member [204’]. In an exemplary embodiment, the inclined bottom
surface [218’] extends laterally at an angle from a lip region of the extension
section [216b’] of the planar bottom surface [216’]. A detailed overview of the
15 bottom half‐wall surface [214’] is provided hereunder for better understanding
the concepts of the present disclosure.
The bottom half‐wall surface [214’] defines a circular bottom half‐wall section [214a’], and an extension bottom half‐wall section [214b’]. Notably, the circular bottom half‐wall section [214a’] extends upwards from the ring section [216a’] of
20 the planar bottom surface [216’], while the extension bottom half‐wall section [214b’] extends upwards from edges of the extension section [216b’] of the planar bottom surface [216’] as well as edges of the inclined bottom surface [218’]. As seen from figure 2a and 2b, a reader may understand that the extension bottom half‐wall section [214b’] does not extend from a face of the extension section
25 [216b’]. Notably, at least a portion of the extension bottom half‐wall section [214’b] extending from the edges of the extension section [216’b] of the bottom planar surface [216’] and the edges of the inclined bottom surface [218’] extend inwards upto the ring section [216’a] of the bottom planar surface [216’].

Hereinafter, the arrangement of the first duct member [202’] with the second duct member [204’] will be described in detail, along with the additional features arising out of such arrangement.
In an assembled configuration i.e., when the first duct member [202’] is attached
5 to the second duct member [204’], the top half‐wall surface [208’] of the first duct
member [202’] abuts with the bottom half‐wall surface [214’] of the second duct
member [204’], to defines a bottom opening i.e., a duct inlet [220] adapted to
receive hot air therein, and a peripheral opening i.e., a duct outlet [222] adapted
to vent hot air therethrough. More particularly, in such a configuration, the first
10 duct member [202’] and the second duct member [204’] are attached to each
other, such that the extension top half‐wall section [208b’] and the extension
section [206b’] defined in the first duct member [202’], and the inclined bottom
surface [218’] and the extension bottom half‐wall section [214b’] defined in the
second duct member [204’], integrally form the peripheral opening i.e., the duct
15 outlet [222], therebetween.
Furthermore, in the aforementioned configuration, a combination of the extension top half‐wall section [208b’] defined in the first duct member [202’], and the extension bottom half‐wall section [214b’] defined in the second duct member [204’], define a first wall [222a] and a second wall [222b] of the air duct assembly
20 [126’]. Notably, in the assembled configuration, the first duct member [202’] is attached to the second duct member [204’], to integrally define the duct outlet [222] between the first wall [222a] and the second wall [222b] thereof, such that each of the first wall [222a] and the second wall [222b] form an angle (α) of 50 degree and above, relative to a central line passing through a middle of the duct
25 outlet [222].
Moreover, in the aforementioned configuration, the air duct assembly [126’] further comprises an interior region [224] having an involute profile, for efficient circulation of hot air therein. Notably, the interior region [224] is defined between

the ring section [206’a] defined in the first duct member [202’], and the ring section [216’a] defined in the second duct member [204’].
In addition to the aforementioned, in an exemplary embodiment, the second wall [222b] defines a stopper portion [226] extending inwards therefrom and upto the 5 ring section [216’a] defined in the second duct member [204’]. In yet another alternate embodiment, the air duct assembly [126’] may additionally include a central wall (not shown) extending parallel to the first wall [222a] and the second wall [222b] of the duct outlet [222], and at the middle of the duct outlet [222]. The assembly of the air duct assembly [126’] will be described hereinafter in detail.
10 In assembly, the one or more snap members on one of the first duct member [202’] and the second duct member [204’] is snapped with corresponding one or more snap members on the other of the first duct member [202’] and the second duct member [204’], to assemble the air duct assembly [126’]. Thereafter, the air duct assembly [126’] is positioned within the main housing [106] of the mixer
15 grinder [100], more particularly, installed above the motor assembly [108], such that each of the duct inlet [220] and the duct outlet [222] of the air duct assembly [126’], is aligned with each of the air inlet [116] and the pair of air outlets [118], respectively, to efficiently vent out hot air from the main housing [106] of the food processor [100]. The operation of the mixer grinder [100] employing the air duct
20 assembly [126’] therein, as disclosed herein, will be described hereinafter.
In operation, the fan [124] of the motor cooling assembly [110] intakes ambient air through the air inlet [116] defined in the lower part [114] of the main housing [106], thereafter, the ambient air conducts heat from the motor assembly [108], and this hot air passes on to the air duct assembly [126]. The air duct assembly 25 [126] receives hot air from the duct inlet [220] thereof, circulates the hot air within the interior region [224] having the involute profile, and vents the hot air through the duct outlet [222] thereof, to finally vent hot air to external environment through the pair of air outlets [118] defined in the upper part [112] of the main

housing [106].
Figure 7 illustrates a tabulation of comparative test results drawing a comparison between the mixer grinder [100] employing the disclosed air duct assembly [126] (FIRST EMBODIMENT), and the mixer grinder (not shown) without air duct
5 assembly (PRIOR ART), in accordance with the concepts of the present disclosure. Referring to figure 7, it may be observed by the reader that the rise in temperature observed for FIRST EMBODIMENT of the present invention is 81.06°C, while the rise in temperature observed for PRIOR ART is substantially higher than the disclosed embodiment, i.e., 115.58°C. In view of the aforementioned, the mixer
10 grinder [100] employing the air duct assembly [126], in accordance with the first embodiment of the present disclosure, proves to provide better cooling performance in comparison with the existing art.
Figure 8 illustrates a tabulation of comparative test results drawing a comparison between the mixer grinder [100] employing the air duct assembly [126’] (SECOND
15 EMBODIMENT), in accordance with the concepts of the present disclosure, and the mixer grinder not employing the air duct assembly (PRIOR ART). As seen from figure 8, a reader may learn that the rise in temperature observed for the SECOND EMBODIMENT of the present invention is 86.14 °C (SECOND EMBODIMENT temperature rise), while the rise in temperature observed for PRIOR ART is
20 substantially higher than the present invention, i.e., 115.58 °C (PRIOR ART temperature rise). In view of the aforementioned, it is abundantly clear that the mixer grinder [100] with a motor cooling assembly [110] employing the air duct assembly [126’], as disclosed herein, proves to provide a better air‐cooling performance as compared to the existing art.
25 Various advantages of the disclosed air duct assembly [126, 126’] exist. Particularly, since the air duct assembly [126, 126’] includes a single duct inlet [220] and a single duct outlet [222], the air duct assembly [126, 126’] facilitates a laminar flow of air therein. This results in improved air holding and/or circulating

capacity of the disclosed air duct assembly [126, 126’], thereby improving the overall cooling efficiency of the motor cooling assembly [110] employing the disclosed air duct assembly [126, 126’]. Additionally, the aforementioned laminar flow of air within the air duct assembly [126, 126’] further eliminates turbulence 5 therein, thereby resulting in reduced noise while performing processing operations on the mixer grinder [100].
Moreover, in the first embodiment of the present invention, the involute profile of the interior region [224] of the air duct assembly [126, 126’], facilitates a relative increment in velocity of air flowing therethrough, from the duct inlet [220] to the
10 duct outlet [222]. Therefore, air handling, holding, and/or circulating capacity of the air duct assembly [126, 126’] is improved, which results in increased cooling efficiency of the motor cooling assembly [110] employing the disclosed air duct assembly [126, 126’]. Further, the first wall [222a] and the second wall [222a] of the duct outlet [222] form a greater angle therebetween as compared to the
15 existing art, i.e., in the range of 80 degrees to 120 degrees, and thus, ensure efficient venting of hot air from the main housing [106] to the external environment. Additionally, the stopper portion [226] extending from the second wall [222b] restricts recirculation of hot air within the interior region [224], thereby avoiding backflow of air into the main housing [106].
20 In view of the aforementioned features and advantages of the disclosed air duct assembly [126] i.e., the first embodiment, the air vent characteristics of the disclosed air duct assembly [126] is highly improved in comparison with the existing art. This results in improved cooling efficiency of the motor cooling assembly [110] and the involute profile defined between the planar top surface
25 [212a] of the top surface [212] and the curved wall section [214a] of the wall surface [214] ensures the substantial noise reduction. Furthermore, in an alternate embodiment, the central separation wall further reduces the noise during operations of the mixer grinder [100], while the hot air is vent from the

disclosed air duct assembly [126].
Additionally, in the second embodiment, the involute profile of the interior region [224] of the air duct assembly [126’], facilitates a relative increment in velocity of air flowing therethrough, from the duct inlet [220] to the duct outlet [222].
5 Therefore, air handling, holding, and/or circulating capacity of the air duct assembly [126’] is substantially improved, which further results in increased cooling efficiency of the motor cooling assembly [110] employing the disclosed air duct assembly [126’]. Further, the first wall [222a] and the second wall [222b] of the duct outlet [222] form a greater angle therebetween as compared to the
10 existing art, i.e., 100 degrees or above, and thus, ensure efficient venting of hot air from the main housing [106] to the external environment. Additionally, the stopper portion [226] extending from the second wall [222b] restricts recirculation of hot air within the interior region [224], thereby avoiding backflow of air into the main housing [106].
15 In view of the aforementioned features and advantages of the disclosed air duct assembly [126’] i.e., the second embodiment, the air vent characteristics of the disclosed air duct assembly [126’] is highly improved in comparison with the existing art. This results in improved cooling efficiency of the motor cooling assembly [110], and the involute profile of the interior region [224] further
20 ensures substantial noise reduction during operations of the mixer grinder [100]. Furthermore, in an implementation, the central separation wall further reduces the noise during operations of the mixer grinder [100], while the hot air is vent from the disclosed air duct assembly [126’].
While the preferred embodiments of the present invention have been described 25 hereinabove, it should be understood that various changes, adaptations, and modifications may be made therein without departing from the spirit of the invention and the scope of the appended claims. It will be obvious to a person skilled in the art that the present invention may be embodied in other specific

forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive.
LIST OF COMPONENTS
5 100 – Mixer Grinder
102 – Processing unit
106 – Main housing
108 – Motor assembly
110 – Motor cooling assembly 10 112 – Upper part
114 – Lower part
116 – Air inlet
118 – Air outlets
120 – Motor 15 122 – Motor shaft
124 – Fan
126 – Air duct assembly (First embodiment)
212 – Top surface
212a – Planar top surface 20 212b – Inclined top surface
214 – Wall surface

214a – Curved wall section
126’ – Air duct assembly (Second embodiment)
202’ – Upper duct member
204’ – Lower duct member 5 206’ – Top surface
206a’ – Ring section
206b’ – Extension section
208’ – Top half‐wall surface
208a’ – Circular top half‐wall section 10 208b’ – Extension top half‐wall section
210’ – Cylindrical member
212’ – Bottom surface
214’ – Bottom half‐wall surface
214a’ – Circular bottom half‐wall section 15 214b’ – Extension bottom half‐wall section
216’ – Planar bottom surface
216a’ – Ring section
216b’ – Extension section
218’ – Inclined bottom surface 20 220 – Duct inlet

222 – Duct outlet 222a – First wall 222b – Second wall 224 – Interior region 5 226 – Stopper portion

I/We Claim:
1. An air duct assembly [126’] deployed in a motor cooling assembly [110] of a
food processor [100], comprising:
- a first duct member [202’]; and
5 - a second duct member [204’],
wherein the first duct member [202’] is attached with the second duct
member [204’], to integrally define a duct outlet [222] between a first wall
[222a] and a second wall [222b] thereof, such that each of the first wall [222a]
and the second wall [222b] form an angle (α) of 50 degrees or above, relative
10 to a central line passing through a middle of the duct outlet [222].
2. The air duct assembly [126’] as claimed in claim 1, comprising an interior region [224] having an involute profile for efficient circulation of hot air therein.
3. The air duct assembly [126’] as claimed in claim 1, comprising a duct inlet [220] for receiving hot air therein.
15 4. The air duct assembly [126’] as claimed in claim 3, wherein the first duct member [202’] defines a top surface [206’] defining a ring section [206a’] and an extension section [206b’] extending therefrom, such that one edge of the extension section [206b’] extends tangentially from the ring section [206a’], while the other edge thereof extends at an inclination from the ring section
20 [206a’].
5. The air duct assembly [126’] as claimed in claim 4, wherein the ring section [206a’] of the top surface [206’] defines a cylindrical member [210’] extending vertically upwards from a centre thereof.

6. The air duct assembly [126’] as claimed in claim 4, wherein the first duct member [202’] defines a top half‐wall surface [208’] extending from a periphery of the top surface [206’], the top‐half wall surface [208’] defining:
- a circular top half‐wall section [208a’]; and
5 - an extension top half‐wall section [208b’],
wherein the circular top half‐wall section [208a’] extends downwards from the ring section [206a’] of the top surface [206’], while the extension top half‐ wall section [208b’] extends downwards from edges of the extension section [206b’] of the top surface [206’].
10 7. The air duct assembly [126’] as claimed in claim 1, wherein the second duct member [204’] defines a bottom surface [212’] comprising a planar bottom surface [216’] and an inclined bottom surface [218’] extending therefrom.
8. The air duct assembly [126’] as claimed in claim 7, wherein the planar bottom
surface [216’] defines a ring section [216a’] and an extension section [216b’]
15 extending therefrom, such that one edge of the extension section [216b’] extends tangentially from the ring section [216a’], while another edge thereof extends at an inclination from the ring section [216a’].
9. The air duct assembly [126’] as claimed in claim 8, wherein the second wall
[222b] defines a stopper portion [226] extending inwards therefrom and upto
20 the ring section [216’a] defined in the second duct member [204’].
10. The air duct assembly [126’] as claimed in claim 7, wherein the second duct
member [204’] defines a bottom half‐wall surface [214’] extending from a
periphery of the bottom surface [212’], the bottom half‐wall surface [214’]
defining:
25 - a circular bottom half‐wall section [214a’]; and

- an extension bottom half‐wall section [214b’],
wherein the circular bottom half‐wall section [214a’] extends upwards from the ring section [216a’] of the planar bottom surface [216’], while the extension bottom half‐wall section [214b’] extends upwards from edges of the 5 extension section [216b’] of the planar bottom surface [216’].
11. The air duct assembly [126’] as claimed in claims 1‐9, wherein the first duct
member [202’] and the second duct member [204’] are attached to each other,
such that the extension top half‐wall section [208’b] and the extension section
[206’b] defined in the first duct member [202’], and the inclined bottom
10 surface [218’] and the extension bottom half‐wall section [214’b] defined in the second duct member [204’], integrally define the duct outlet [222] therebetween.
12. The air duct assembly [126’] as claimed in claims 1, 6, and 9, wherein a
combination of the extension top half‐wall section [208’b] defined in the first
15 duct member [202’] and the extension bottom half‐wall section [214’b] defined in the second duct member [204’], define the first wall [222a] and the second wall [222b].
13. The air duct assembly [126’] as claimed in claims 2, 4, and 8, wherein the
interior region [224] is defined between the ring section [206’a] defined in the
20 first duct member [202’] and the ring section [216’a] defined in the second duct member [204’].
14. The air duct assembly [126’] as claimed in claims 1‐12, comprising a central
wall extending parallel to the first wall [222a] and the second wall [222b] of
the duct outlet [222], from the middle of the duct outlet [222].
25 15. The air duct assembly [126’] as claimed in claim 1, wherein the food processor [100] comprises a processing unit [102] including:

‐ a main housing [106];
‐ a motor assembly [108]; and
‐ the motor cooling assembly [110],
wherein the motor assembly [108] is fixedly housed and positioned within 5 the main housing [106], while the motor cooling assembly [110] is installed on the motor assembly [108], to be positioned within the main housing [106].
16. The air duct assembly [126’] as claimed in claim 14, wherein the main housing
[106] of the food processor [100] comprises an upper part [112] and a lower
part [114], such that the upper part [112] defines a pair of air outlets [118] on
10 a circumference thereof, while the lower part [114] defines an air inlet [116] on a bottom surface thereof.
17. The air duct assembly [126’] as claimed in claim 1‐15, wherein the air duct
assembly [126’] is installed above the motor assembly [108], such that each of
the duct inlet [220] and the duct outlet [222] of the air duct assembly [126’],
15 is aligned with each of the air inlet [116] and the pair of air outlets [118], respectively, to efficiently vent out hot air from the main housing [106] of the food processor [100].