FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
AND
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
“MULTI-ENVIRONMENT COMPATIBLE FAN”
We, Bajaj Electricals Limited, an Indian National, of 45/47, Veer Nariman Road, Fort Mumbai- 400001, India.
The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF INVENTION
The present invention relates to the field of consumer electronic appliances. In particular, the invention relates to a ceiling fan with a system for adjustably fixing the blade angle of the fan blades
5
BACKGROUND OF THE INVENTION
This section is intended to provide information relating to the 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.
10 Ceiling fans as conventionally available, have a fixed angle blade, i.e., in other words,
the blade angle cannot be changed in the ceiling fan, as a result of which, the “air feel” of a particular fan stays constant and cannot be changed as per user requirement. In case a change is required, either the whole fan has to be changed, or the complete blade has to be replaced. Both of these can be highly inconvenient, expensive, and impractical.
15 Therefore, there is a need to provide a system by which the blade angle can be
conveniently changed in the same fan using the same blades, so as to adapt to the user and/or location requirements.
SUMMARY OF THE INVENTION
20 This section is intended to introduce certain objects of the disclosed method and system
in a simplified form, and is not intended to identify the key advantages or features of the present disclosure.
In an aspect of the present invention, there is provided a fan blade motor housing
comprising a plurality of first mount and a plurality of second mount fixedly located on
25 the fan motor housing for mounting at least a fan blade to the fan motor housing, said
first mount having a first length and a first width, having a first end and a second end along the length of the first mount, the height of the first end is d1, height of the second end is d2, wherein d1 < d2 or d > d2; said second mount having a second length and a

second width, having a first end and a second end along the length of the second mount, the height of the first end is d3, height of the second end is d4, wherein d3 = d4.
In an aspect of the present invention, any two adjacent mount are not identical.
In an aspect of the present invention, wherein said first mount has a top surface and a
5 bottom surface, wherein the top surface is inclined along the length of the mount.
In an aspect of the present invention, the angle of inclination of first mount is in the range of -4 ˚to 4˚.
In another aspect of the present invention, the first end comprises at least a fixing means
adapted to removably affix the shank of the fan blade; and independently the second end
10 comprises at least a fixing means adapted to removably affix the shank of the fan blade.
In another aspect of the present invention, the plurality of first mount are equidistant from each other and equidistant (x1) from the center of the housing; the plurality of second mount are equidistant from each other and equidistant (x2) from the center of the housing; and wherein x1= x2, x1 >x2, or x1 d2; said second mount having a second length and a second width , having a first end and a second end along the length of the second mount , the height of the first end is d3, height of the second end is d4, wherein d3 = d4.

In an aspect of the present invention, there is provided a method of altering the
configuration of a blade of a fan, said method comprising: (a) unmounting the fan blade
from a first mount or a second mount in a fan motor housing , said housing comprising
a plurality of first mount and a plurality of second mount fixedly located on the fan
5 motor housing for mounting at least a fan blade to the fan motor housing , said first
mount having a first length and a first width, having a first end and a second end along
the length of the first mount, the height of the first end is d1, height of the second end is
d2, wherein d1 < d2 or d > d2; said second mount having a second length and a second
width, having a first end and a second end along the length of the second mount, the
10 height of the first end is d3, height of the second end is d4, wherein d3 = d4; and (b)
mounting the fan blade on an adjacent second mount or first mount.
In another aspect of the present invention, there is provided a method of altering the configuration of a blade of a fan said method comprising mounting the fan blade from a first mount to an adjacent second mount in a fan motor housing by sliding the fan blade
15 from first mount to second mount via a slider mechanism in communication with the
first mount and the adjacent second mount, said housing comprising a plurality of first mount and a plurality of second mount fixedly located on the fan motor housing for mounting at least a fan blade to the fan motor housing, said first mount having a first length and a first width, having a first end and a second end along the length of the first
20 mount, the height of the first end is d1, height of the second end is d2, wherein d1 < d2 or
d > d2; said second mount having a second length and a second width , having a first end and a second end along the length of the second mount , the height of the first end is d3, height of the second end is d4, wherein d3 = d4; and (b) mounting the fan blade on an adjacent second mount or first mount .
25
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
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
30 some embodiments of the application. For those skilled in the art, without any creative
work, other drawings can be obtained based on these drawings.

Fig. 1a depicts the perspective view of the first mount fixedly located on the periphery of a fan motor housing, in accordance with an embodiment of the present invention.
Fig. 1b depicts the perspective view of the first mount having length and width, in accordance with an embodiment of the present invention.
5 Fig 1c depicts the perspective view showing the first side and second side of the first
mount, in accordance with an embodiment of the present invention.
Fig. 1d depicts the perspective view of the first mount depicting the inclined top surface; first end having a height d1 and second end of the first mount having a height d2. in accordance with an embodiment of the present invention.
10 Fig. 1e depicts the perspective view of the first mount comprising a first end with a fixing
means; and a second end with a fixing means, in accordance with an embodiment of the present invention.
Fig. 2 depicts the side view of the fan motor housing and mount with inclined top surface, in accordance with an embodiment of the present invention.
15 Fig. 3a depicts the top view of a fan motor housing comprising first mounts and second
mounts, in accordance with an embodiment of the present invention.
Fig. 3b depicts the perspective view of a fan motor housing in accordance with an embodiment of the present invention.
Fig. 4 depicts the top view of a fan motor housing comprising a first set of mounts and a
20 second set of mounts, in accordance with an embodiment of the present invention.
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 embodiments of the present
25 invention. It will be apparent, however, that embodiments of the present invention may
be practiced without these specific details. Several features described hereafter 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 fully addressed by any of the features
described herein. Exemplified embodiments of the present invention are described below,
5 as illustrated in various drawings in which like reference numerals refer to the same parts
throughout the different drawings.
The present invention provides a fan blade motor housing (100) comprising a plurality of first mount (200) and a plurality of second mount (300) fixedly located on the fan motor housing (100) for mounting at least a fan blade (400) to the fan motor housing (100), said
10 first mount (200) having a first length (l1) and a first width (w1), having a first end (202)
and a second end (204) along the length (l1) of the first mount (200), the height of the first end (202) is d1, height of the second end (204) is d2, wherein d1 < d2 or d > d2; said second mount (300) having a second length (12) and a second width (w2), having a first end (302) and a second end (304) along the length (l2) of the second mount (300), the
15 height of the first end (302) is d3, height of the second end (304) is d4, wherein d3 = d4.
The first mount (200) has a top surface (206) and a bottom surface (208). The top surface (206) is an inclined plane along the length (l1) of the direction of the mount (200). In a preferred embodiment, the inclined plane is a continuous incline. In another embodiment, the inclined plane is a discontinuous incline comprising one or more steps. In an
20 embodiment, the angle of inclination, as measured from the first end (202) of the first
mount (200) to the second end (204) of the mount (200) is in the range of -4° to 4°. In an embodiment, the angle of inclination is any one of -4°, -3°, -2°, -1°, 0°, 1°, 2°, 3°, or 4°. The bottom surface (208) of the first mount (200) is substantially flat. In an embodiment, the bottom surface (208) of the first mount (200) is substantially complementary to the
25 contours of the housing (100) surface to which the first mount (200) is attached.
The first end (202) of at least a first mount (200) comprises at least a fixing means (210)
adapted to removably affix a shank (402) of a fan blade (400). In a preferred embodiment,
the first end (202) comprises a single fixing means (210). In another embodiment, the
first end (202) comprises 2 fixing means. It is understood to a person skilled in the art
30 that with regard to the fixing means (210) located in the first end (202) of the first mount
(200), the said fixing means (210) can be located in the region between the first end (202)

and an imaginary line perpendicular to the length of the first mount (200) dividing the mount (200) in two equal halves.
The second end (204) of the first mount (200) comprises at least a fixing means (212)
adapted to removably affix a shank (402) of a fan blade (400). In a preferred embodiment,
5 the second end (204) comprises a single fixing means (212). In another embodiment, the
second end (204) comprises 2 fixing means. It is understood to a person skilled in the art
that with regard to the fixing means (212) located in the second end (204) of the mount
(200), the said fixing means (212) can be located in the region between the second end
(204) and an imaginary line perpendicular to the length of the first mount (200) dividing
10 the first mount (200) in two equal halves.
The first end (302) of at least a second mount (300) comprises at least a fixing means
(306) adapted to removably affix a shank (402) of a fan blade (400). In a preferred
embodiment, the first end (302) comprises a single fixing means (306). In another
embodiment, the first end (302) comprises 2 fixing means. It is understood to a person
15 skilled in the art that with regard to the fixing means (306) located in the first end (302)
of the second mount (300), the said fixing means (306) can be located in the region between the first end (302) and an imaginary line perpendicular to the length of the second mount (300) dividing the second mount (300) in two equal halves.
The second end (304) of the second mount (300) comprises at least a fixing means (308)
20 adapted to removably affix a shank (402) of a fan blade (400). In a preferred embodiment,
the second end (304) comprises a single fixing means (308). In another embodiment, the
second end (304) comprises 2 fixing means. It is understood to a person skilled in the art
that with regard to the fixing means (308) located in the second end (304) of the mount
(300), the said fixing means (308) can be located in the region between the second end
25 (304) and an imaginary line perpendicular to the length of the second mount (300)
dividing the mount (300) in two equal halves.
It is understood to a person skilled in the art that the fixing means (210, 212, 306, 308) can be any fixing means generally known in the art used to affix a shank of a fan blade to the motor housing of a fan.

In a preferred embodiment, any two adjacent first mount (200) of the plurality of first mount (200) are equidistant from each other. In an embodiment, at least two adjacent first mount (200) of the plurality of first mount (200) are equidistant from each other. In a preferred embodiment, the plurality of first mount (200) are equidistant (x1) from the center of the housing (100). In an embodiment, at least two first mount (100) of the plurality of first mount (200) are equidistant (x1) from the center of the housing (100). In a preferred embodiment, each of the plurality of first mount (200) are equidistant from each other and equidistant from the center of the housing (100).
In a preferred embodiment, any two adjacent second mount (300) of the plurality of second mount (300) are equidistant from each other. In an embodiment, at least two adjacent second mount (300) of the plurality of second mount (300) are equidistant from each other. In a preferred embodiment, the plurality of second mount (300) are equidistant (x2) from the center of the housing (100). In an embodiment, at least two second mount (300) of the plurality of second mount (300) are equidistant (x2) from the center of the housing (100). In a preferred embodiment, each of the plurality of second mount (300) are equidistant from each other and equidistant from the center of the housing (100).
In a preferred embodiment, x1 = x2. In another embodiment, x1 > x2. In yet another embodiment, x1 < x2.
In a first embodiment, the fan blade (400) can be removably mounted on at least a first mount (200) and detached to removably mount on a second mount (300). In an alternate embodiment, the fan blade (400) can be removably mounted on a first mount (200) and without detaching from first mount (200) mounted on an adjacent second mount (300) via a slider mechanism in communication with the first mount (200) and the adjacent second mount (300).
The present invention also provided a fan (500) comprising a fan blade motor housing (100) as substantially described herein. In an embodiment, the fan further comprises a plurality of blades. In an embodiment, the fan comprises 3 blades. In another embodiment, the fan comprises 4 blades. It is to be understood by a person skilled in the art that the fan of the present invention is not limited by the number of blades disclosed herein. It is also to be understood to a person skilled in the art that the number of first or

second mounts (200, 300) fixedly located on the fan motor housing (100) is commensurate with the number of fan blades.
The present invention also provides a method of altering the configuration of a blade of a fan, the method comprising: (a) unmounting the fan blade from a first mount (200) or a second mount (300) in a fan motor housing (100); and (b) mounting the fan blade on an adjacent second mount (300) or first mount (200).The present invention also provides a method of altering the configuration of a blade of a fan, said method comprising mounting the fan blade from a first mount (200) to an adjacent second mount (300) in a fan motor housing (100) by sliding the fan blade from first mount (200) to second mount (300) via a slider mechanism in communication with the first mount (200) and the adjacent second mount (300).
In an exemplary exemplification of the invention, Fig. 1a shows a perspective view of a first mount (200) fixedly located on the periphery of a fan blade motor housing (100). Fig. 1b is a perspective view of the first mount (200) having length (l1) and width (w1). Fig. 1c is a perspective view showing the first end (202) and second end (204) of the first mount (200). The first mount (200) can be divided into two halves along its length by an imaginary line (dotted) perpendicular to the length of the first mount (200). Fig. 1d is a perspective view of the second mount (200) having an inclined top surface (206) and a bottom surface (210) (not shown); the height of the first end (202) of the first mount (200) is d1; the height of the second end (204) of the first mount (200) is d2. It is understood that the height d1 and d2 of first end (202) and second end (204) of the first mount (200) are not fixed, i.e., the height of first end (202) can be d2 and height of second end (204) can be d1. In a non-limiting exemplification, Fig. 1e depicts a first fixing means (210) located near the first end (202) of the first mount (200) and a second fixing means (212) located near the second end (204) of the first mount (200). The height of the first fixing means (210) (from the base of the first mount (200)) is lower than the height of the second fixing means (212). It is understood that the height of the first fixing means (210) can be higher than the height of the second fixing means (212). While not shown in Fig. 1a-e, the housing (100) also comprises a plurality of second mounts (300) as substantially described in the present specification.

Fig. 2 shows a side view of the fan motor housing (100). The side view of a first mount (200) is also visible in which the inclined plane of the top surface (206) can be seen (not shown). The angle of inclination of the plane of the top surface (206) is also highlighted in Fig. 2, whereby it can be appreciated that the inclination is a continuous graded incline from a first end (202) to a second end (204) of the first mount (200). While not shown in Fig. 2, the housing (100) also comprises a plurality of second mounts (300) as substantially described in the present specification.
Fig. 3a and 3b shows the top view and perspective view respectively of an exemplary example of the fan blade motor housing (100) comprising 3 first mounts (200a, 200b, 200c) and 3 second mounts (300a, 300b, 300c). The first mounts (200a, 200b, 200c) are placed equidistant from each other and from the center of the housing (100). The second mounts (300a, 300b, 300c) are also placed equidistant from each other and from the center of the housing (100). It can also be seen that any two adjacent mounts are different, i.e., adjacent mounts are a first mount (200) and a second mount (300).
In another embodiment of the housing (100) as described in Fig. 3, Fig. 4 shows the top view of an exemplary example of the fan blade motor housing (100) comprising a 3 first mounts (200a, 200b, 200c) located at a distance x1 from the center of the housing (100); and 3 second mounts (200d, 200e, 200f) located at a distance x2 from the center of the housing (100). It is to be noted that x1 is more than x2. This configuration allows for change in sweep size of the fan without requiring 2 different fans/ fan blades/ motor housing. While not shown in Fig. 4, the housing (100) also comprises a plurality of second mounts (300) located at distance x1 and/or x2 from the center of the housing (100) and each second mount (300) is located between any two first mount (200).
In an exemplary operation of the housing (100) of the present invention (not shown), a fan blade (400) removably attached to any one of a first mount (200) may be detached and attached to an adjacent first mount (200) or second mount (300) to change the lift angle of the blade or sweep area of the blade. In yet another exemplary operation of the housing (100) of the present invention (not shown), a fan blade (400) removably attached to any one of a first mount (200) can be mounted onto an adjacent second mount (300) via a slider mechanism wihtout removing the blade (400) from the first mount (200). The slider mechanism is in communication with the first mount (200) and the adjacent second

mount (300). This allows for change in lift angle of the blade without changing the blade (400) itself or housing (100).
In an exemplary configuration of the fan (500) (not shown) described in the present specification, the fan (500) comprises a fan motor housing (100), the motor housing (100) comprising first mount (200a, 200b, 200c) and second mount (300a, 300b, 300c) fixedly located on the periphery of the motor housing (100). The angle of inclination of the plane of the top surface of the second mount (300) is about 0°. The angle of inclination of the plane of the top surface of the first mount (200) is about 2°. In a first configuration, the shank of each of the 3 blades of the fan (500) are mounted on the fan motor housing (100) via the first mount (100a, 100b, 100c) such that the angle of the blade is 2°. It is understood that the shank of the blade of the may be at an angle x°, such that upon mounting, in the first operation, the total angle of the blade of the fan would be (2+x)°.
In a second configuration, the shank of each of the 3 blades are removed from the mounts (200a, 200b, 200c) and mounted on the fan motor housing (100) via the second mount (300a, 300b, 300c) such that the angle of the blade is 0°. It is understood that the shank of the blade of the may be at an angle x°, such that upon mounting, in the second configuration, the total angle of the blade of the fan would be only x°.
In the operation of the fan (500) in the first configuration vs. the second configuration, due to change in the angle of fan blade, there is a measurable alteration/ change in the air delivery volume per unit time, efficiency of the ceiling fan operation, and/ or coverage area of the ceiling fan.
ADVANTAGE OF THE INVENTION
The present invention provides a fan blade motor housing (100) comprising a plurality of first mount (200) and second mount (300) located on the fan motor housing (100), whereby the first mount (200) has an inclined surface with fixing means (210, 212) at either end. A user can detach the fan blade shank and affix to first fixing means (210) or second fixing means (212), thus allowing change in lift angle of blade and thus affect change in fan performance parameters. The fan sweep area can also be altered based on the particular location of the mounts (200, 300). This invention absolves the requirement

of changing the whole fan or requirement of new blades with different blade angle, thus representing a significant cost saving and efficiency.
LIST OF REFERENCE NUMERALS
(100) fan blade motor housing;
(200) first mount;
(202) first end of first mount (200);
(204) second end of first mount (200);
d1 height of first end (202) of first mount (200);
d2 height of second end (204) of first mount (200);
w1 width of first mount (200);
l1 length of first mount (200);
(206) top surface of first mount (200);
(208) bottom surface of first mount (200);
(210) fixing means located in first end (202) of first mount (200);
(212) fixing means located in second end (204) of first mount (200);
(300) second mount;
(302) first end of second mount (300);
(304) second end of second mount (300);
(306) fixing means located in first end (302) of second mount (300);
(308) fixing means located in second end (304) of second mount (300);
x1 distance of first mount (200) from center of motor housing (100);
x2 distance of second mount (300) from center of motor housing (100);
(400) fan blade;

(402) shank of fan blade (400) (500) fan comprising housing (100).

I/We claim:
1. A fan blade motor housing (100) comprising a plurality of first mount (200) and a
plurality of second mount (300) fixedly located on the fan motor housing (100) for
mounting at least a fan blade (400) to the fan motor housing (100),
said first mount (200) having a first length (l1) and a first width (w1), having a first end (202) and a second end (204) along the length (l1) of the first mount (200), the height of the first end (202) is d1, height of the second end (204) is d2, wherein d1 < d2 or d > d2;
said second mount (300) having a second length (12) and a second width (w2), having a first end (302) and a second end (304) along the length (l2) of the second mount (300), the height of the first end (302) is d3, height of the second end (304) is d4, wherein d3 = d4.
2. The housing (100) as claimed in claim 1, wherein any two adjacent mount are not identical.
3. The housing (100) as claimed in claim 1, wherein said first mount (200) has a top surface (206) and a bottom surface (208), wherein the top surface (206) is inclined along the length (l1) of the mount (200).
4. The housing (100) as claimed in claim 3, wherein the angle of inclination of first mount (200) is in the range of - 4 ˚to 4˚.
5. The housing (100) as claimed in claim 1, wherein the first end (202, 302) comprises at least a fixing means (210, 306) adapted to removably affix a shank (402) of the fan blade (400); and independently the second end (204, 304) comprises at least a fixing means (212, 308) adapted to removably affix the shank (402) of the fan blade (400).
6. The housing (100) as claimed in claim 1, wherein the plurality of first mount (200) are equidistant from each other and equidistant (x1) from the center of the housing (100); the plurality of second mount (300) are equidistant from each other and

equidistant (x2) from the center of the housing (100); and wherein x1= x2, x1 >x2, or x1