FORM 2
THE PATENT ACT 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION
Novel Ceiling Fan Blade.
2. APPLICANT (S)
(a) Shah Ashokkumar Dahyabhai
(b) NATIONALITY: an Indian
(c) 6, Nemnath Society, N.N. Road, Paldi, Ahmedabad - 380 007. Gujarat, India.
3. PREMABLE TO THE DESCRIPTION

PROVISIONAL
The following specification describes the invention.

0 COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

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This application is Patent of Addition of copending Indian Patent No. 205116, filed in India on 20th August, 2002, all of which are hereby incorporated herein in their entirety by reference.
This invention relates to A NOVEL CEILING FAN BLADE
Since decades people use ceiling fans in homes and offices to get continuous air. Generally ceiling fans include plurality of blades extending from a motorized hub for rotation therewith to circulate air in a room. Ceiling fan blades are attached to the hub via a standardized clamp. The clamp has a triangular shape at one end and a square shape at the other hand. The triangular/ square shaped end is riveted to the blades with rivets.
The rotating hub of the ceiling fan has two corresponding bores. The clamp is attached to the hub by fitting bolts or screws through the holes into the bores of the hub. In such ceiling fans, the conventional shape of the clamp and blade allows the blade to remain at 180° angle at the top with the hub, making a straight line with the hub. The blades are parallel with the ceiling and the floor. In this position the blades deliver air directly below them. As a result the air delivery is limited to the area directly below the ceiling fan.
Generally people do not seat directly under a ceiling fan, but they seat in an area surrounding it, where there is no air delivery from the conventional ceiling fan. Due to circular motion of the ceiling fan blades, certain amount of air is thrown to the sides of the fan horizontally, which is practically wasted.
A NOVEL CEILING FAN BLADE is invented to overcome the above-mentioned drawback of the conventional ceiling fan blades reduce air delivery to the sides and delivers more air to the area bellow the ceiling fan.
2

The present invention addresses the drawback of the conventional blade of ceiling fan and will be described with great specific and clarity with reference to the following drawings.
Fig. 1 represents view of the bottom side of the motorized hub and
Conventional ceiling fan blade. Fig.2 represents bottom view of the novel ceiling fan blade with the sloping
shapes of the blade. Fig. 3 represents bottom view of the novel ceiling fan blade with bend on the
side.
Fig.l represents bottom view of the ceiling fan hub and the blade facing the floor. The Blade rotates in anticlockwise direction from 4 to 5. As show in the Fig.l, wherein left side end is numbered by 1, right side end is numbered by 2 and the middle point of the blade is numbered by 3. Due to circular motion of the blade from 4 to 5, air coming under the section 1-5, goes out at pint 3 due to centrifugal force, as there is no surface at .point 3 to hold the air. That amount of air is delivered to side of the blade horizontally and not to the area bellow it. Hence that much air is wasted. The effort or energy used to move that air is also wasted.
As shown in fig.2, left side end of the blade is numbered as 1 and right side end of the blade is numbered as 2. As shown in fig. 2, length side of 1 to 3 is shorter than the length side of 2 to 4. Line 1 to 2 may be curved or straight line.
As shown in Fig.2, point 2 positioned at higher than the point 1, so when the air is coming under point 1 will have support through out to point 2 during the anticlockwise circular motion of the blade so, air will not go out to sides, but will be delivered to the area bellow the ceiling fan. The wastage of air and energy will be reduced.
3

An example is shown in Fig. 3, length 2 to 5 is one third of the total length from 2 to 4 and length 2 to 3 is also one third of the total width length from 2 to 1. In the present invention blade is bent inward at an angle of 15° at point 3 to 5. Angle 235 = 15° Angle 253 = 15°
This is only for an example , actually length 2-5 may vary from XA to XA of the
total length 2-4 of the blade length. The width 2-3 of the bent portion may vary
from lA to !4 of the total width 1-2 of the blade length. The angle may vary from
5° to 20°
Angle 235 = 5° to 20°
Angle 253 = 5° to 20°
This inward bend of the portion 2-3-5 of the blade at the rear side of the blade
stops the air from going out horizontally at point 2 due to centrifugal force and
delivers it to the area bellow the ceiling fan. Hence the wastage of air and energy
is reduced.
4

I Claim:
1. A NOVEL CEDLING FAN BLADES comprising of upward slanting blades with front side of the blade length being shorter than the rear side length of the blade and the rear side blade is bent inwardly from the right side end.
2. A NOVEL CEILING FAN BLADES of claim 1 wherein the blade is slanted upward with angle of 5° to 20° with the motorized hub of the blade.
3. A NOVEL CEILING FAN BLADES of claim 1 wherein right side end is bent from the Vz to V4 length of the total length of the rear side blade and Vz to V4 width of the total width inwardly at an angle of 5° to 20° .
4. A NOVEL CEILING FAN BLADES substantially herein described with reference to the foregoing description and the accompanying drawings.
Dated this on 6th August, 2007
Dr. Rajeshkumar H. Acharya
Advocate &Patent agent
For and on behalf of the applicant
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Abstract
A Novel Ceiling Fan Blade delivers more air to the area bellow the ceiling fan. In the present invention front side length is shorter than the rear side length of the fan blade. The fan blade is bent inwardly from the right side end from the V2 to lA length of the total length and V2 to VA width of the total width at an angle of 5° to 20°. This inward bland stops the air from going out horizontally due to centrifugal force and delivers it to the area bellow the ceiling fan, hence the wastage of air end energy is reduced.