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 modular blade-changeable mixer
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR
Samsul Ekram of Crompton Greaves Limited, Electronic Development Center, CG Global R&D Centre, Kanjur Marg (E), Mumbai, 400 042 Maharashtra, India; 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 and Chaudhary Ranjit of Crompton Greaves Limited, Appliance Division, Kanjur Marg (E), Mumbai, 400 042 Maharashtra, India; all 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 electrical and electronic appliances.
Particularly, this invention relates to home appliances.
Still particularly, this invention relates to a modular blade-changeable mixer.
Background of the Invention:
Under the gamut of home appliances within the precincts of a kitchen room, a mixer is an appliance which processes food in a way that the actions of mixing, grinding, crushing, blending and the like actions are achieved. Typically, a mixer includes a driving unit which provides power. There is a vessel with pre-fixed blades, which vessel mates with the driving unit such that the blades can be rotated inside the vessel.
Depending upon the blade pre-fixed in the vessel, the action or the finesse of the action can be achieved. In order to change the finesse of the action, the vessel (with blade) is changed. A different vessel with a different blade is adapted to mate with the drive unit. Thus, a mixer includes a single drive unit and multiple vessels having pre-fixed blades with complementary matching mating / coupling elements on the vessel and the drive unit.
Once the operation of mixing is performed in the vessel, a user removes the contents out of the mixer. The position of the blades makes it difficult for a

user to remove mixed contents from under the blades. Cleaning is hence a difficult task.
There is a need for a modular blade-changeable mixer.
Prior Art:
US6193181 discloses a Electrical household appliance for cooking
preparation, such as multipurpose domestic robot, and multipurpose working
container.
It discloses a multi-function food processor type comprising a container and
rotatable working assembly driven by a motor by the intermediary of a
driving shaft can be removable passed through the opening of the lid.
FR2768608 discloses a Multifunction domestic food mixer, blender, shredder machine.
US20100005977 discloses a universal food processor. It reveals the concept of universal food processor that has a universal bowl mounted on a single engine adapted to receive multiple of utensils for any operation.
However, all these patent documents include a drive unit or drive which is provided from the top. In practical terms, this is not a feasible or a user-friendly device. There is a need for a bottom-driven mixer with modularity in vessel selection and blade selection which can be easily removed and replaced.

Objects of the Invention:
An object of the invention is to provide a mixer with a single vessel and multiple blades.
Another object of the invention is to provide a mixer with a single vessel and multiple removable blades for the same single vessel.
Yet another object of the invention is to provide an easy to clean mixer.
Summary of the Invention:
According to this invention, there is provided a modular blade-changeable mixer, said mixer comprises:
a. base unit with a drive assembly, said drive assembly;
b. base shaft stemming from said drive unit inside said base unit with an
extended external shaft extending outside said base unit;
c. receivable clamp at an operative top end of said base shaft;
d. blade assembly having a set of blades and a blade shaft extending
downwards from said set of blades, said blade shaft adapted to be
received onto said receivable clamp such that it fits into it and said clamp
grasping said blade shaft;
e. vessel with a holed bottom adapted to fit onto said base unit, said hole at
the bottom of said vessel allowing entry for said clamp so that the blade
assembly is fitted from the top of said vessel into said clamp;

f. vessel shaft adapted to engage said blade assembly from the top of said
vessel; and
g. vessel lid with an aperture located concentrically in order to receive the
top end of said vessel shaft.
Typically, said drive assembly includes a motor.
Typically, said base shaft is an axially rotatable shaft.
Typically, said base shaft has an internal axially rotatable assembly.
Typically, said base shaft is a driver shaft.
Preferably, said extended external shaft is a slotted external shaft and the operative bottom part of said vessel is a flexible part with an aperture such that the edges of said aperture fix into said slot, thereby ensuring that there is no opening at the bottom part of said vessel in its operative configuration.
Typically, said vessel shaft is a driven shaft.
Typically, said vessel lid includes securing means to secure said vessel lid on to said vessel.
Preferably, said vessel shaft includes a threaded bottom screw adapted to fit into said blade and blade shaft.

Preferably, said blade shaft includes a threaded bottom screw adapted to fit into said base shaft at its operative top.
Additionally, said mixer includes bearings between said blade assembly and said vessel shaft.
Brief Description of the Accompanying Drawings:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a schematic of the modular blade-changeable mixer; and
Figure 2 illustrates an exploded view of the modular blade-changeable mixer which showcases its components.
Detailed Description of the Accompanying Drawings:
According to this invention, there is provided a modular blade-changeable mixer.
Figure 1 illustrates a schematic of the modular blade-changeable mixer. Figure 2 illustrates an exploded view of the modular blade-changeable mixer which showcases its components.

In accordance with an embodiment of this invention, there is provided a base unit (12) with a drive assembly (14). The drive unit includes a motor which receives electrical power in order to drive the mixer. The base unit is a sturdy insulated unit with electrical cables for connecting to a power source. There is a base shaft (16) which stems from the drive unit (14) typically placed inside the base unit (12). This shaft is a rotatable shaft or has an internal rotatable assembly. The rotation is axial rotation. The base shaft (16) extends out of the base unit (12) to form the extended external shaft of the base unit (12). The operative top end of this base shaft (16) includes a receivable clamp (18). The base shaft is the driver shaft.
In accordance with another embodiment of this invention, there is provided a blade assembly (22) adapted to be received onto the receivable clamp (18) such that it fits into it. The clamp (18) grasps a portion (or shaft) extending downwards from the blades. Thus, the modularity of the blades is achieved. A plurality of such blades with varying sizes, varying number of blades, varying blade edges and types can be manufactured in order to be received by the clamp of the base unit.
In accordance with yet another embodiment of this invention, there is provided a vessel (26) with a holed bottom adapted to fit onto the base unit (12). The hole at the bottom of the vessel allows entry for the clamp (18). The blade assembly (22) can then be fitted from the top into the clamp (18). The operative bottom part of the vessel may be a flexible part with an aperture such that the edges of the aperture fix into a slot provided in the protruding part of the base shaft which part protrudes out of the base unit.

This ensures that there is no opening at the bottom part of the vessel in its operative configuration.
In accordance with still another embodiment of this invention, there is provided a vessel shaft (24) adapted to engage the blade assembly from the top of the vessel. This vessel shaft is the driven shaft. The vessel shaft can allow from easy removal of the blades from the top of the vessel, without digging into the vessel.
The vessel shaft (24) may have a threaded bottom screw which fits into the blade (22) and blade shaft (22a). Further, the blade shaft (22a) may have a threaded bottom screw which fits into the base shaft (16) at its operative top. The vessel shaft need not be a driven shaft. Only the screw beneath it may rotate in accordance with the blade movement and bearings may be provided between the blade assembly and the vessel shaft.
In accordance with an additional embodiment of this invention, there is provided a vessel lid (28) with an aperture (32) located concentrically to receive the top end of the vessel shaft (24). In its detached form, the vessel may be removed from the base unit. Then, the vessel shaft which engages the blade assembly can be removed along with the blade assembly. The contents from the vessel can be emptied. The vessel lid can be securely fitted on to the vessel.
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. A modular blade-changeable mixer comprising:
a. base unit with a drive assembly, said drive assembly;
b. base shaft stemming from said drive unit inside said base unit with an
extended external shaft extending outside said base unit;
c. receivable clamp at an operative top end of said base shaft;
d. blade assembly having a set of blades and a blade shaft extending
downwards from said set of blades, said blade shaft adapted to be
received onto said receivable clamp such that it fits into it and said
clamp grasping said blade shaft;
e. vessel with a holed bottom adapted to fit onto said base unit, said hole
at the bottom of said vessel allowing entry for said clamp so that said
blade assembly is fitted from the top of said vessel into said clamp;
f. vessel shaft adapted to engage said blade assembly from the top of
said vessel; and
g. vessel lid with an aperture located concentrically in order to receive
the top end of said vessel shaft.
2. A mixer as claimed in claim 1 wherein, said drive assembly includes a motor.
3. A mixer as claimed in claim 1 wherein, said base shaft is an axially rotatable shaft.
4. A mixer as claimed in claim 1 wherein, said base shaft has an internal axially rotatable assembly.
5. A mixer as claimed in claim 1 wherein, said base shaft is a driver shaft.

6. A mixer as claimed in claim 1 wherein, said extended external shaft is a slotted external shaft and the operative bottom part of said vessel is a flexible part with an aperture such that the edges of said aperture fix into said slot, thereby ensuring that there is no opening at the bottom part of said vessel in its operative configuration.
7. A mixer as claimed in claim 1 wherein, said vessel shaft is a driven shaft.
8. A mixer as claimed in claim 1 wherein, said vessel lid includes securing means to secure said vessel lid on to said vessel.
9. A mixer as claimed in claim 1 wherein, said vessel shaft includes a threaded bottom screw adapted to fit into said blade and blade shaft.
10.A mixer as claimed in claim 1 wherein, said blade shaft includes a threaded bottom screw adapted to fit into said base shaft at its operative top.
11. A mixer as claimed in claim 1 wherein, said mixer includes bearings between said blade assembly and said vessel shaft.