[001] The present invention relates to the field of Ceiling Fan. The present invention in particular relates to a high RPM performance fan with shank-less and rivet-less aesthetically pleasing design .
DESCRIPTION OF THE RELATED ART
[002] In typical ceiling fans, aluminium blades are used as they are light in weight. Hence, they require less powerful motor which reduces the cost of the fan. The blades of the fan are usually attached to the fan via a shank which is riveted onto the blade at the point of mounting to the motor housing. The shank provides additional strength to the blade. Both the lift angle and twist angle which generate the air throw is incorporated into the shank.
[003] Decorative fans hide the rivets and shanks by adding additional plastic parts onto the blade or by extending parts from the motor housing. These additional plastic parts or extending parts add to the noise and turbulence created by the fan and also accumulates dust over time. . In addition, they also increase the cost of the product.
[004] Fans with blades made of material other than aluminium, such as wood, plastic etc., do not require shanks and rivets but are much more expensive and are heavier than fans with blades made of aluminium. Hence, they need motors with high wattage which further increases the cost and reduce the overall RPM of the fan.
[005] Patent Application No.: 6524/DELNP/2014 discloses a fan blade comprising a root end, a blade region, and a transition region.

Wherein each of the root end and blade region comprise a unique profile, and wherein the transition region comprises a profile which transitions the root end profile to the blade region profile. The root end profile comprises a substantially convex top surface, a substantially concave domed sector, and reliefs to allow for the root end to be coupled with a similarly shaped fan hub extrusion. The blade region profile comprises a substantially convex top surface and bottom surface which terminate at a leading edge and trailing edge. The blade region slopes upward along a length of the blade region and terminates at a curved tip.
[006] The fan blade described in the art is mounted directly on the motor body of the fan. Selection of material of the blades depends on the type of profile of the blades. Shank-less fan blades has intricate profile as both lift angle and twist angle must be incorporated in fan blade to throw air downwards. To provide desired profile to the fan blade different materials such as bamboo, plastic, fiberglass matting or carbon fiber composite materials combined with epoxy resins are used. These materials make the fan blade heavy which consequently need motor of higher power to run the fan. The expensive material of the blade and motor of high wattage makes the shank-less fans expensive. Also, absence of shank in the assembly decreases the support of the blades.
[007] The fan described in the present invention uses aluminium blades and hides the shank and rivets within the diameter of the outer plastic bottom cover with a maximum diameter of 210 mm. Also,

shank only has lift angle and twist angle is aerodynamically incorporated into the blade shape. Additionally, the way in which the lift angle has been given in the shank and the twist angle has been incorporated into the blade allows for a reduction in overall height of the product. Hence, the fan provides the design of a shank-less and rivets-less fan at low cost with high performance. In present assembly noise and turbulence is also reduced as the shank is moved towards the centre which encloses the mounting area, shanks and rivets within the body of the fan.
OBJECTS OF THE INVENTION
[008] The principal object of the present invention is to provide a fan with shank-less and rivet-less look.
[009] Another object of the present invention is to provide a fan with shank-less and rivet-less look in which rivet and shank of the blades are obscured in the smallest diameter possible.
[010] Still another object of the present invention is to provide a fan with shank-less and rivet-less look with high performance and RPMs.
[011] Another object of the present invention is to provide a fan with shank-less and rivet-less look in which shank and blade is arranged to provide more support to the assembly.
[012] Yet another object of the present invention is to provide a fan with shank-less and rivet-less look which is economical.

SUMMARY OF THE INVENTION
[013] In accordance with the said objectives, the present invention provides a fan with shank-less and rivet-less look achieved with aluminium blades. The aluminium blade is attached to a shank with rivets to provide additional strength as in basic fans. The shank and blade assembly is mounted onto the bottom of the motor housing via the shank. This shank and blade assembly is unique as the shank only has the lift angle; the twist angle has been aerodynamically incorporated into the blade shape. This whole assembly is then covered by the circular top outer plastic cover and bottom outer plastic cover. This assembly has multiple benefits:
> This assembly allows the shanks to mount closer to the centre of the motor housing which hide the rivets and shank within maximum diameter of 210 mm when the circular outer plastic covers are assembled.
> Noise and turbulence is also reduced as moving the shanks towards the centre allows us to enclose the mounting area, shanks and rivets within the body of the fan, hence removing any parts which would cause turbulence when exposed to the air while the fan is running.
> This method of hiding the shank and rivets also allows us to use aluminium blades which are cheaper as they are lighter and put fewer loads on the motor which in-turn can be of a lower wattage. This brings down the overall cost of the fan.

> The incorporation of the twist angle into the blade also allows
us to reduce the size of the outer plastic covers further reducing
costs, as the twisting occurs outside the outer plastic covers
> The use of Aluminium blades with the shanks also allows the
5 fan to rotate at higher RPMs (335 -365 RPM).
[014] The aluminium motor housing also acts as a subassembly onto which the blade and shank assembly is mounted which then covered by the outer plastic covers.
BRIEF DESCRIPTION OF THE DRAWINGS
10 [015] It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments.
[016] Figure: 1 depicts basic fan assembly with fan blades attached to 15 upper side of the motor housing using rivets.
[017] Figure: 2 depict decorative fan assembly in which additional plastic parts are used to hide the rivets and shank from the bottom.
[018] Figure: 3 depict plastic fan assembly mounted directly on the motor housing.
20 [019] Figure: 4 depict a ceiling fan assembly with fan blades attached to lower side of the motor housing using rivets according to present invention.
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[020] Figure: 5 depict a ceiling fan assembly and its different components according to present invention.
[021] Figure: 6 depict assembled ceiling fan with shank-less and rivet-less look according to present invention.
5 DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[022] The present invention will be described in detail below with reference to an embodiment as shown in the drawing.
[023] Accordingly, the present invention provides a ceiling fan (10) with shank-less and rivet-less look in which a shank (1) and plurality
10 of blades (3) are mounted with a common motor housing platform (5) in such a way that a rivet (2) and the shank (1) are hidden. The common motor housing platform (5) has a maximum diameter of 210 mm when the circular outer plastic covers (6, 7) are assembled. The smaller size of the common motor housing platform (5) is achieved by
15 moving the mounting of the shanks (1) closer to the center of the motor and only giving the lift angle in the shanks (1). Twist angle is given in the blade (3) once it exits the outer plastic covers.
[024] Referring to figure 5, the ceiling fan (10) according to the 20 present invention is disclosed. The ceiling fan (10) comprises a motor (not shown, enclosed in the common motor housing platform (5)), a plurality of fan blades (3), the common motor housing platform (5), plastic outer top cover (6), plastic outer bottom cover (7), support rod
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(8), shanks (1) and fastener. The fasteners is preferably rivets (2) but other fastening means such as screws, bolts, clips, clamps, and/or any other suitable fastener for coupling fan blades (3) with the shank (1) may be used.
5 [025] Referring to figure 4, the ceiling fan assembly according to the present invention is given. The support rod (8) which is an elongated tube is first coupled on a surface preferably ceiling from one end. The other end of the support rod (8) accommodates plastic outer top cover (6) and common motor housing platform (5) which encloses motor.
10 The common motor housing platform (5) is provided with holes (9) to hold rivets (2) or other fastening means when shanks (1) are fastened to the bottom of the common motor housing platform (5).
[026] Then aluminium blade (3) of the fan is fastened to shank (1) with the help of fasteners preferably rivets (2).
15 [027] The shank (1) and aluminium blade (3) assembly is a unique assembly in which rather than providing both lift angle and twist angle on the shank as provided in basic ceiling fan, only lift angle is provided on the shank (1). The twist angle (4) is aerodynamically incorporated into the shape of the aluminium blade (3). By giving
20 twist angle (4) in the aluminium blades (3) the size of the outer plastic covers (6, 7) are reduced, which further reduced the cost of the fan (10).
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[028] The assembly of the shank (1) and aluminium blades (3) is further fastened to the bottom of the common motor housing platform (5) with fastening means preferably rivets (2).
[029] This whole assembly is then covered by the circular top outer 5 plastic cover (6) and bottom outer plastic cover (7). The covers (6, 7) hide the shanks (1) and rivets (2) fastened to the bottom of the common motor housing platform (5). The assembly described above gives an aesthetically pleasing look to the ceiling fan (10).
[030] As both shanks (1) and rivets (2) are moved towards the centre, 10 the mounting area, shanks (1) and rivets (2) are enclosed within the body of the fan. This removes any parts which would cause turbulence when exposed to the air while fan is working.
[031] The ceiling fan (10) assembly with shank-less and rivet-less design as described above has numerous advantages over fan 15 assemblies currently available. The advantages includes:
> Mounting the shanks closer to the centre of the motor housing hence allow to hide the rivets and shanks within a maximum diameter of 210 mm when the circular outer plastic covers are assembled.
20 > Reduction in noise and turbulence as moving the shanks
towards the centre allow to enclose the mounting area, shanks and rivets within the body of the fan, hence removing any parts which would cause turbulence when exposed to the air while fan is working
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> Hiding the shank and rivets also allow using aluminium
blades which are cheaper and lighter in weight and put
fewer loads on the motor which in turn can be of lower
wattage. This lower down the overall cost of the fan.
5 > Incorporating twist angle on the blade allows to reduce
the size of the outer plastic covers further reducing cost, as the twisting occurs outside the outer plastic covers.
> Enhancing the performance of the fan by providing high
RPMs, and reducing cost as aluminium blades, motor of
10 lower wattage and outer plastic covers of reduced sizes
are used.
[032] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific
15 embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various assembly that, although not explicitly described or shown herein, embody the principles of the present
20 subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to
25 be construed as being without limitation to such specifically recited
10

examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the aforementioned description when 5 considered in connection with the accompanying figures.
[033] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled 10 in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[034] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single
15 component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and
20 other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above
25 that the fabrication of the unique structures herein and the operation
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thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of "comprising" or "including" also contemplates embodiments that "consist essentially of or "consist of the recited feature.
[035] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

We claim:

A ceiling fan (10) with shank-less look according to the present invention comprises:
A common motor housing platform (5);
a plurality of fan blades (3);
a plastic outer top cover (6);
a plastic outer bottom cover (7);
a support rod (8);
a plurality of shanks (1); and
a plurality of fasteners (2);
characterized in that the shank (1) is attached to the blade (3) using plurality of fasteners (2) to make a shank and blade assembly (11);
the shank and blade assembly (11) is mounted to the bottom surface of the common motor housing platform (5) with the help of plurality of fasteners (2) via the shank (1); and
the shank and blade assembly (11) attached to the common motor housing platform (5) is covered by the plastic outer top cover (6) and the plastic outer bottom cover (7) to cover the plurality of shanks (1) and the plurality of fasteners (2) to

provide a high RPM performance fan with shank-less and rivet-less aesthetically pleasing design.
The ceiling fan (10) as claimed in claim 1, wherein the plurality of fan blades (3) is made of aluminum.
The ceiling fan (10) as claimed in claim 1, wherein the plurality of fasteners (2) are rivets, screws, bolts, clips, clamps.
The ceiling fan (10) as claimed in claim 1, wherein the plurality of shanks (1) includes a lift angle of 6 degrees
The ceiling fan (10) as claimed in claim 1, wherein the plurality of blades (3) includes twist angle between the range of 9 - 10 degrees which allows reducing the size of the outer plastic covers.
The ceiling fan (10) as claimed in claim 1, wherein the rotating speed of the ceiling fan (10) is the range 335 -365 RPM.