FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A motor housing with an air chute for providing an air flow guide
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR
Katti Sudarshan of Crompton Greaves Limited, Industrial Design Center, CG Global R&D Centre, Kanjur Marg (E), Mumbai, 400 042 Maharashtra, India and Nadkarni Mayur, of Crompton Greaves Ltd., Appliance R&D, Appliance Division,Kanjur Marg (E), Mumbai, 400 042 Maharashtra, India;; both Indian Nationals
PREAMBLE TO THE DESCRIPTION :
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

Field of the Invention:
This invention relates to the field of mechanical assemblies.
Particularly, this invention relates to air guides, air chutes, and heat dissipation assemblies and equipment.
More particularly, this invention relates to a motor housing with an air chute for providing an air flow guide.
Background of the Invention:
A mixer or a grinder or any such similar apparatus includes a motor installed within a housing. This motor provides the drive for the mixing action or the grinding action provided by a set of blades of the mixer. The housing, in general, provides a support for the entire motor and motor mounting assembly along with the mixer and grinding vessels with the blades.
Performance of a household mixer grinder mainly depends on the quality and reliability of its motor. One of the major factors that negatively affect the reliability of motor is heat generation and consequent heat dissipation characteristics of the motor body or motor housing which envelopes the motor.
Figure 1 illustrates a mixer with motor according to the prior art.

This system includes a motor (12) and a motor housing (14) which employs a radial fan (16) at the top of the motor in a vertically disposed co-axial manner in order to dissipate the motor generated hot air through air vents (18) disposed on all the four sides. As hot air rises up from around the motor, it makes its way through the vents as channeled by the radial fan. Reference numeral 19 refers to air inlet to the motor housing.
Figure 2 illustrates a relatively newer design of mixer and motor housing with decreased heat dissipation characteristics.
In the design of Figure 2 of the accompanying drawings, due to the form factor, air vents cannot be provided on all four sides. Reference numeral 21 refers to an operative front side of the housing. Reference numeral 22 refers to an operative left side of the housing. Reference numeral 22 refers to an operative right side of the housing. Reference numeral 24 refers to an operative rear side of the housing.
This leaves only one side (rear side) (24) available to provide air vents (25). The air vents are disposed in a relative upward direction and a relative downward direction with respect to a motor.
Since, this departs from normal annularly placed vents or vents in all direction, there is a need for a housing, especially, the rear portion of the housing such that the air is channeled from inside the motor housing to the vents disposed in the rear housing.

Objects of the Invention:
An object of the invention is to provide improved heat dissipation for a motor of a mixer grinder which includes air vents at only one side of the housing.
Another object of the invention is to prevent motor deterioration due to lack of heat dissipation in a mixer grinder which includes air vents at only one side of the housing.
Yet another object of the invention is to prevent hot air from not getting trapped inside the mixer body.
Still another object of the invention is to provide heat dissipation in a motor housing without the need for an extra part or component.
Summary of the Invention:
According to this invention, there is provided an air chute for providing an air flow guide, said air chute being a projected boundary wall jutting pperatively inwards from said housing, said wall being made of:
a) dual parallel placed length-wise walls which are inwardly curvilinear, in that, the curve forms a substantial trough along said length-wise directions; and
b) single breadth-wise wall, which is outwardly curvilinear, in that, the curve forms a substantial crest along said breadth-wise directions.

According to this invention, there is provided a motor housing with an air chute for providing an air flow guide, said air chute being a projected boundary wall jutting operatively inwards from said housing, said wall being made of:
a) dual parallel placed length-wise walls which are inwardly curvilinear, in that, the curve forms a substantial trough along said length-wise directions;
b) single breadth-wise wall, located away from an inner surface of said housing, which is outwardly curvilinear, in that, the curve forms a substantial crest along said breadth-wise directions;
wherein, said length-wise walls mate with said inner surface of said housing, said channel being formed by the three projected walls i.e. said dual parallel placed length-wise walls and said single breadth-wise wall forming an air guide for the hot air that rises up and above from the motor, thereby biasing the air flow away from the motor and through the vents provided in said inner surface of said housing.
Typically, said air chute is a housing integrated air chute.
Typically, said air chute is an injection molding process manufactured air chute.
Brief Description of the Accompanying Drawings:
Figure 1 illustrates a mixer with motor according to the prior art; and
Figure 2 illustrates a relatively newer design of mixer and motor housing with
decreased heat dissipation characteristics.
The invention will now be described in relation to the accompanying drawings, in which:

Figure 3 illustrates a mixer grinder with internal components and an improved air guiding housing;
Figures 4, 5, 6, and 7 illustrate various views of a part of the improved air guiding housing with air chute.
Detailed Description of the Accompanying Drawings:
According to this invention, there is provided a housing cover for a mixer grinder with an integrated air chute for heat dissipation.
Figure 3 illustrates a mixer grinder with internal components and an improved air guiding housing. The housing has vents (25) as shown.
Figures 4, 5, 6, and 7 illustrate various views of a part of the improved air guiding housing with air chute (100).
The interior surface of the housing includes rib elements (42) which provide internal support to the housing.
In accordance with an embodiment of this invention, there is provided an air chute which is a projected boundary wall which juts operatively inwards from said housing. The dual parallel placed length-wise walls are inwardly curvilinear in that the curve forms a substantial trough along the length-wise directions. The single breadth-wise wall, located away from the housing wall, is outwardly curvilinear in that the curve forms a substantial crest along the breadth-wise directions. The

length-wise walls mate with the inner surface of the housing. The channel formed by the three projected walls i.e. the dual parallel placed length-wise walls and the single breadth-wise wall form an air guide for the hot air that rises up and above from the motor, thereby biasing the air flow away from the motor and through the vents provided. The channel so formed guides the air towards the air vent as shown by the arrows in Figures 3 to 7 of the accompanying drawings.
Dissipated air from inside the mixer body is directed to rear side through an air chute that is provided in the body. Shape of the air chute facilitates flow of air to the rear of the mixer. This air chute is integrated with body part of the housing. No extra part is required to direct the hot air. Same function is achieved with the help of a projection integrated into the outer body parts with no extra cost. It does not require special manufacturing process to make the chute which is achieved in normal injection molding process. The size of the chute is enough to pass most of the air dissipated out of the motor. With the help of larger surface area of outlet air vent, hot air does not get trapped inside the mixer body.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. An air chute for providing an air flow guide, said air chute being a projected
boundary wall jutting operatively inwards from said housing, said wall being
made of:
a) dual parallel placed length-wise walls which are inwardly curvilinear, in that, the curve forms a substantial trough along said length-wise directions; and
b) single breadth-wise wall, which is outwardly curvilinear, in that, the curve forms a substantial crest along said breadth-wise directions.
2. A motor housing with an air chute for providing an air flow guide, said air
chute being a projected boundary wall jutting operatively inwards from said
housing, said wall being made of:
a) dual parallel placed length-wise walls which are inwardly curvilinear, in that, the curve forms a substantial trough along said length-wise directions;
b) single breadth-wise wall, located away from an inner surface of said housing, which is outwardly curvilinear, in that, the curve forms a substantial crest along said breadth-wise directions;
wherein, said length-wise walls mate with said inner surface of said housing, said channel being formed by the three projected walls i.e. said dual parallel placed length-wise walls and said single breadth-wise wall forming an air guide for the hot air that rises up and above from the motor, thereby biasing the air flow away from the motor and through the vents provided in said inner surface of said housing.

3. A motor housing as claimed in claim 1 wherein, said air chute is a housing integrated air chute.
4. A motor housing as claimed in claim 1 wherein, said air chute is an injection molding process manufactured air chute.