FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
“A JAR OF THE MIXER GRINDER”
We, Bajaj Electricals Limited, an Indian National, of, 45/47, Veer Nariman Road, Fort, Mumbai - 400001, Maharashtra, 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 electric kitchen appliances. Particularly, the present invention relates to a mixer grinder. More particularly, the present invention relates to a jar for a mixer grinder.
BACKGROUND OF THE INVENTION
Mixer Grinder jars generally comprise a jar base disposed in a mixing container having a shell or enclosure and a lid for accessing/closing the jar. Such jars are configured to be fitted on a grinder wherein the motor rotates the blades provided at the base of the jar to mix/grind or blend food and other contents. However, such appliances are prone to vibrations and noise generated due to the operation of the motor of the grinder. The vibrations created by the operating motor cause the base itself, and other components within the base, to vibrate, thereby generating noise as well. Further, noise and vibration from the motor may be translated to other components of the base, such as the shell or enclosure of the jar. Also, vibrations translated from the motor to the base cause the shell or enclosure to act as a sound amplifier.
It is also seen that vibrations in the jar on the lower side (in the blade area) are more than in other areas in the jar. Some potential reasons for same are blade misalignment and kind of grinding contents.
Efforts have been made to reduce the vibration and sound created by grinders by adopting various structures and technologies. Indian patent application no. 201741025802 discloses a double-layered jar using dampening material for noise and vibration reduction during the use of a mixer grinder. Said art discloses a jar having two layers along with dampening material between the two layers of the jar to reduce the audible noise during the usage of the domestic mixer-grinder. However, the said art fails to cure the problem that arises due to the uneven distribution of vibration from the base to the lid. Also, as the dampening material is to be filled from the base up to the lid of the jar, it would require a

substantial amount of dampening material which would increase the overall cost of the jar. Further, the assembly of said jar requires very skilled labor due to the complexity of design, thereby adding to the overall cost of manufacturing.
Therefore, there is a need for a jar for a mixer grinder which can overcome one or more limitations stated above or any other limitations associated with the prior art.
SUMMARY OF THE INVENTION
The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
In an aspect of the present invention, there is provided a jar for a mixer grinder comprising: (a) a base; (b) a shell having an inner surface and an outer surface; (c) a lid; and (d) a handle, wherein the outer surface of the shell comprises a polymer layer covering at least a part of the outer surface, and a dampener layer sandwiched between the outer surface of the shell and the polymer layer.
In an aspect of the present invention, the polymer layer and the dampener layer covers 50% of the outer surface of the shell of the jar.
In an aspect of the present invention, the polymer layer and the dampener layer covers the outer surface of the shell from the base of the outer surface of the shell towards the lip of the outer surface of the shell.
In another aspect of the present invention, the polymer layer and the dampener layer forms a continuous cover over the outer surface of the jar.

In another aspect of the present invention, the thickness of the polymer layer and the dampener layer independently is in the range of 2mm to 4mm.
In another aspect of the present invention, the thickness of the shell is in the range of 0.5mm to 1mm.
In yet another aspect of the present invention, the polymer layer material is selected from the group comprising ABS, Nylon 66, Derlin, and combinations thereof.
In yet another aspect of the present invention, the dampening layer material is selected from the group comprising nitrile, sorbthane, TPE-Polyone, flouro-carbon, and combinations thereof.
In still another aspect of the present invention, the shell is made of a material selected from the group comprising stainless steel, aluminum, alloys, and combinations thereof.
In an aspect of the present invention, the vibrational displacement of at least a part of the shell during operation of the mixer grinder is reduced by at least 80%.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some implementations of the system(s), in accordance with the present subject matter, are described by way of examples, and with reference to the accompanying figures, in which:
Fig. 1 illustrates a perspective view of the jar of a mixer grinder, in accordance with an embodiment of the present invention.

Fig. 2 illustrates a sectional view of a jar of a mixer grinder, in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
While this invention is susceptible of embodiments in many different forms, there is shown in the drawings and will herein be described in detail, a preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspects of the invention to the embodiment illustrated.
Before describing in detail, the various embodiments of the present disclosure it may be observed that the novelty and inventive step of the invention resides in the jar of a mixer-grinder. It is to be noted that a person skilled in the art can be motivated from the present disclosure and can perform various modifications. Such modifications should be construed within the scope of the invention.
Accordingly, the drawings show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the disclosure with details that will otherwise be readily apparent to those of ordinary skill in the art having benefit of the description herein.
The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that an assembly, setup, system, device that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system or device or setup. In other words, one or more elements in the system or apparatus or device proceeded by "comprises a" does not, without more constraints, preclude the existence of other elements or additional elements in the assembly or system or apparatus or device.

The present invention provides a jar for a mixer grinder comprising: (a) a base; (b) a shell having an inner surface and an outer surface; (c) a lid; and (d) a handle, wherein the outer surface of the shell comprises a polymer layer covering at least a part of the outer surface, and a dampener layer sandwiched between the outer surface of the shell and the polymer layer.
In an embodiment, the mixer grinder jar is adapted to reduce vibration generated from the jar during operation of the mixer grinder. In another embodiment, the mixer grinder jar is adapted to reduce noise generation during operation of the mixer grinder. In yet another embodiment, the mixer grinder jar is adapted to dissipate heat away from the jar container during operation of the mixer grinder. The mixer grinder jar may be used to mix and/or grind various materials including, but not limited to, spices, vegetables, fruits, and so forth. Embodiments of the present disclosure are intended to include or otherwise cover any type of material that can be ground using the jar of the mixer grinder.
The base of the jar of the present invention is configured to engage with a motor disposed on a mixer grinder. The shell of the jar defines a mixing/grinding volume, and a lid is provided for closing the jar. The jar further comprising a handle attached to the shell of the jar. The handle in an embodiment enables a user to hold the jar.
In a preferred embodiment, the polymer layer and the dampener layer forms a continuous cover over the outer surface of the jar. In a preferred embodiment, the polymer layer and the dampener layer covers about 50% of the outer surface of the shell of the jar. In a more preferred embodiment, the polymer layer and the dampener layer covers about 50% of the outer surface of the shell of the jar from the base of the outer surface of the shell towards the lip of the outer surface of the shell.
The thickness of the polymer layer is in the range of 2mm to 4mm. In an embodiment, the thickness of the polymer layer covering the outer surface of the shell of the jar is uniform.

In another embodiment, the thickness of the polymer layer covering the outer surface of the shell of the jar is non-uniform. In a preferred embodiment, the thickness of the polymer layer covering the outer surface of the shell of the jar is 2.5mm.
The polymer layer material is selected from the group comprising ABS, Nylon 66, Derlin, and combinations thereof. In a preferred embodiment, the material is ABS.
The thickness of the dampener layer sandwiched between the outer surface of the shell of the jar and the polymer layer is in the range of 2mm to 4mm. In an embodiment, the thickness of the dampener layer sandwiched between the outer surface of the shell of the jar and the polymer layer is uniform. In another embodiment, the thickness of the dampener layer sandwiched between the outer surface of the shell of the jar and the polymer layer is non-uniform. In a preferred embodiment, the thickness of the dampener layer sandwiched between the outer surface of the shell of the jar and the polymer layer is 2.5mm.
The dampener layer material is selected from the group comprising nitrile, sorbthane, TPE-Polyone, flouro-carbon, nitrile and combinations thereof. In a preferred embodiment, the material is nitrile.
In an embodiment, the thickness of the polymer layer and the dampener layer are same. In another embodiment, the thickness of the polymer layer is more than the thickness of the dampener layer. in yet another embodiment, the thickness of the polymer layer is less than the thickness of the dampener layer.
In an embodiment, the net thickness of the combination of polymer layer and the dampener layer is uniform. In another embodiment, the net thickness of the combination of polymer layer and the dampener layer is different in at least two different regions.
The thickness of the shell of the jar is in the range of 0.5mm to 1mm. In an embodiment, the thickness of the shell is uniform. In another embodiment, the thickness of

the shell may vary. In an embodiment, the thickness of the shell is more towards the bottom of the shell compared to the rim. The shell material is selected from the group comprising stainless steel, aluminum, alloys, and combinations thereof. In a preferred embodiment, the material is food grade stainless steel.
In an embodiment of the present invention, the jar can be used for grinding wet food ingredients, grinding dry food ingredients, or chutney grinding. The jar can be a wet grinding jar, a dry grinding jar, or a chutney jar.
The subject matter is now described regarding the drawings, wherein like reference numerals are used to refer to like features/elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It may be evident; however, that such matter can be practiced without these specific details. In other instances, well–known structures are shown in diagram form to facilitate describing the invention.
Referring to figures 1 to 2, there is provided a jar (100) for a mixer grinder for reducing vibration and noise during operation of the mixer-grinder according to an exemplary embodiment of the present invention. The jar (100) comprises a base (110) configured to engage with a motor disposed on a mixer grinder (not shown), a shell (120) defining a mixing/grinding volume, a lid (130) for accessing/closing the jar (100), and a handle (170). The handle (170) is attached to the shell (120) of the jar (100) by one or means generally known in the art. The handle (170) enables a user to hold the jar (100).
The base (110) of the jar comprises an engaging means (not shown), like an engaging bush, which is provided towards the bottom of the jar (100) to engage or couple with the motor (not shown) of the mixer grinder. The engaging means (not shown) is configured with a plurality of blades to rotate the blades by way of a rotational force generated by the motor (not shown) of the mixer grinder. In an embodiment of the present invention, a shape of the base (110) may be, but not limited to, trapezoidal, square, and so forth. In another

embodiment of the present invention, the base (110) is made up of a material such as, but not limited to, steel, plastic, and combinations thereof. In a preferred embodiment of the present invention, the base (110) is made up of stainless steel. In yet another embodiment of the present invention, the engaging means comprises a plurality of teeth configured to receive corresponding teeth provided at top of the motor of the mixer grinder.
The outside surface of the shell (120) of the jar (100) is covered from the base (110) of the jar towards the lip of the jar such that about 50% of the outer surface of the shell (120) of the jar (100) is completely covered with at least one layer of at least a polymer (140) material and at least one layer of dampening material (150), which is disposed between the outer surface of the shell (120) and the inner surface of the polymer layer (140). The shell (120) of the jar (100) is made of a food-grade stainless steel sheet having thickness of about 0.6mm. The thickness of the shell (120) is selected such that the dry/hard food ingredients do not create dents while the jar (100) is in operation.
Further referring to figures 1 to 2, during operation, the jar (100) is fitted over the mixer grinder and the motor of the mixer grinder engages with the engaging means provided at the base (110) of the jar (100) to rotate the plurality of blades to grind/mix or blend the material put in the mixing container of the jar. The covering of polymer layer (140) and dampener layer (1500 (sandwiched between the outer surface of the shell (120) and the polymer layer (140)) helps in mitigating/reducing vibrations near source so that they do not get transferred further to other parts of the jar (100), and from jar to the mixer grinder unit.
The polymer layer (140) in conjunction with the dampener layer (150) facilitates the changing of the natural frequency of the jar (100) by increasing stiffness coefficient, “k”, locally near maximum vibration zone [at the base of the shell (120)]. As the stiffness coefficient, “k” is increased near the maximum vibration zone, the response vibration amplitude may be reduced for the same vibration excitation from the motor and plurality of the blades, which in turn decreases the response amplitude of vibration for a particular vibration excitation amplitude and frequency.

During empirical validation of the vibration/noise mitigation characteristics of the jar (100) of the present invention, during operating frequency of 100-350Hz, for a jar without any covering as described in the present invention, towards the bottom of the shell (120) of the jar (100), a vibrational displacement of 9.365µm was observed, while at the top of the shell (120), the vibrational displacement was 4.88µm. The handle (170) also exhibited vibrational displacement of 2.688µm during operation.
When the outer surface of the shell (120) was covered to about 38.5% of the total outer surface area (from bottom of the shell towards the lip of the shell), expectedly, the vibrational displacement at the bottom of the shell was 5µm (about 46% reduction). When the outer surface of the shell (120) was covered to about 50% of the total outer surface area (from bottom of the shell towards the lip of the shell), the vibrational displacement at the bottom of the shell was 1.14µm (about 87% reduction). However, quite unexpectedly, when the outer surface of the shell (120) was covered up to about 77% of the total outer surface area (from bottom of the shell towards the lip of the shell), the vibrational displacement at the bottom of the shell was found to be 4.99µm (about 46% reduction), which is more than what was observed for 50% coverage of the shell. As the vibrational displacement. These data clearly show that the reduction in vibrations/noise at the bottom of the shell, where the vibrations are expected to be the most, additional covering of the outer surface with polymer and dampener material sandwich layer does not necessary lead to increased dampening. In fact, post 50% coverage, the vibrational displacement actually increases. The data is tabulated and presented in Table 1 below.
Table 1

Jar shell Layer coverage Displacement (µm) % difference

0% 9.365 -

38.5% 5 46.61%

50% 1.14 87.83%

77% 4.99 46.72
Accordingly, the jar as disclosed in the present disclosure provides an effective solution by managing and reducing the vibration and noise generation from the base region. Additionally, due to the presence of the polymer and dampening material sandwich layer, the transfer of heat generated during operation to the outer surface is retarded, thus ensuring cool touch.
While considerable emphasis has been placed herein on the particular features of this invention, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the invention. These and other modifications in the nature of the disclosure or the preferred embodiments will be apparent to those skilled in the art from the invention herein, whereby 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.
REFERENCE NUMERALS
(100) - jar
(110) – jar base
(120) – jar shell
(130) – jar lid
(140) – polymer layer
11

(150) – dampener layer (160) – Blade Assembly (170) – jar handle

I/We claim:
1. A jar (100) for a mixer grinder comprising:
a. a base (110);
b. a shell (120) having an inner surface and an outer surface;
c. a lid (130); and
d. a handle (170);
wherein the outer surface of the shell (120) comprises a polymer layer (140) covering at least a part of the outer surface, and a dampener layer (150) sandwiched between the outer surface of the shell (120) and the polymer layer (140).
2. The jar (100) as claimed in claim 1, wherein the polymer layer (140) and the dampener layer (150) covers 50% of the outer surface of the shell (120).
3. The jar (100) as claimed in claim 2, wherein the polymer layer (140) and the dampener layer (150) covers the outer surface of the shell (120) from the base of the outer surface of the shell (120) towards the lip of the outer surface of the shell (120).
4. The jar (100) as claimed in claims 2-3, wherein the polymer layer (140) and the dampener layer (150) forms a continuous cover over the outer surface of the jar (100).
5. The jar (100) as claimed in claim 1, wherein the thickness of the polymer layer (140) and the dampener layer (150) independently is in the range of 2mm to 4mm.
6. The jar (100) as claimed in claim1, wherein the thickness of the shell (120) is in the range of 0.5mm to 1mm.
7. The jar (100) as claimed in claim 1, wherein the polymer layer material is selected from the group comprising ABS, Nylon 66, Derlin, and combinations thereof.

8. The jar (100) as claimed in claim 1, wherein the dampening layer material is selected from the group comprising nitrile, sorbthane, TPE-Polyone, flouro-carbon, and combinations thereof.
9. The jar (100) as claimed in claim 1, wherein the shell is made of a material selected from the group comprising stainless steel, aluminum, alloys, and combinations thereof.
10. The jar (100) as claimed in claim 1, wherein the vibrational displacement of at least a part of the shell (120) during operation of the mixer grinder is reduced by at least 80%.