Description:CROSS - REFERENCE TO RELATED PATENT APPLICATION
The present invention is an improvement to the Indian patent application “202241067552” (hereinafter referred to as “Main application”) filed on 24/11/2022, titled “Automatic mixer grinder with noise mitigation”.

FIELD OF THE INVENTION
The present invention relates to the field of domestic kitchen appliance, in particular mixer grinders with jars housing blades to carry out the blending, whipping, grinding, mixing processes of food ingredients. The present invention specifically relates to an improved embodiment that focuses on the structure and arrangement of the blades housed in the mixer grinder’s jar and its correlation to the overall performance of the mixer grinder.

BACKGROUND OF THE INVENTION
A mixer grinder is an essential kitchen appliance. The setup is an electromechanical device, using electrical energy to perform the mechanical tasks of grinding, whipping, mixing etc. These processes can be carried out due to the body of the mixer which is connected to a motor and consists of electrical coils, speed control breaks and switches, thermal overload relay, armatures and a jar with mechanical blades. The blades are affixed tightly or loosely depending on the jar type. These blades are usually made up of aluminium, bronze, brass, plastic, copper etc. depending on the make of the jar and its intended utility.

In the Indian subcontinent, the culinary tastes are rich, unique and date back generations. Given the diverse geographical terrains and conditions, the food habits of the Indian diaspora are diverse. Yet, some base ingredients remain the same throughout, such as batter that is used for dosa/idly or chappathi dough. These batters are all a combination of rice/wheat and various grains/pulses (dal) such as channa, toor, urad, masoor etc. The average Indian family consists of at least 4 members per household and this translates to large and frequent requirements for batter preparation. The mixer grinder is an essential equipment of every household.

The grinding process is of particular focus with respect to the proposed improved embodiment of main patent application “202241067552” titled “Automatic mixer grinder with noise mitigation”. Grinding is an abrasive mechanical process, wherein sharp objects such as blades are used to carry out this process. Grinding is a process derived from cutting, rapid and precise cutting at regulated speeds to smoothen, flatten and break down bigger and harder input substances. It is used extensively in processing industries and in kitchens.

The advent of mixer grinder came with their own problems that the common households that used them frequently faced. As identified in the main patent application “202241067552” the two major problems are:
1) The amount of noise generated by the vibrations are high, due to greater rotations per minute (RPM) which are needed to finely grind rougher and bigger input ingredients.
2) The frequent handling of the jar’s insides by the users during the preparatory phase leading to safety concerns and incidents.

To further elaborate on the problems identified, the input ingredients are coarse and voluminous, this leads to switching on the jar’s pulse operation to a greater degree to increase speed of rotation of blades. The blades spin at higher speeds, generating heat internally as electrical energy is converted into mechanical energy, heating the apparatus, wherein the higher speed causes the apparatus to vibrate and contributes to significant rise in noise. This is undesirable to the household and especially to the user. The user also must frequently open the jar and manually scrape the remnants and semi-processed matter to place them in feasible grinding positions for further processing, and this leads to scraping and totally avoidable hand injuries. Research into the frequency of such injuries conducted over the 2020 COVID-19 lockdowns produced startling results, wherein the injuries per month drastically rose in the year 2020 when compared to year 2019. This was a time when families were locked down at home with access to external diners and takeovers limited, all meals were prepared at home. Given India’s consumption habits, the use of mixer grinders was as constant as the usage of the light bulb or fan.

The main application purports to address these problems and in furtherance to the proposed embodiment presented herewith, an improvement to the blade structure and design housed in the mixer jar is being put forth here as an additional novel and inventive feature to the overall apparatus.
Blade design is the key contributor to how a mixer jar functions and grinds the ingredients. Some blades are sharper and are made to move at higher speeds to mix both the cutting and grinding process together, to finely grain and ground the input substance. Some blades have teeth and operate at slower speeds to grate and grind harder substances over and over, some blades are smooth to produce semi solid pastes. High speed blades with smaller teeth create a pumping motion while those with bigger teeth create a shearing motion. Heavy bodies with higher viscosities need larger teeth and those that are lighter, hard with lesser viscosities need smaller teeth. As the body of the jar increases, it can accommodate more input ingredient, the blades will have to work more to produce the same output as a smaller jar would in terms of fine grinding. Low speed blades work on keeping multiple compounds suspended and make sure an assortment of materials are properly mixed and not left de-agglomerated.

Thus, blade design determines the kind of operation being carried out within the jar, conversely, depending on what process and how the user wants it performed will necessitate the choice of jar and blade. The proposed embodiment supports main application in addressing the problems and delivering further benefits by modifying the blade design. The improved embodiment as disclosed by present invention is best described as a tower-blade. It is a mountable stack of blades. The proposed improvement focuses on the blade structure, conventionally multiple blade leaves maybe affixed at the same plane in some embodiments to increase the grinding capabilities through force-multiplier effects. It is proposed to have multiple leaves of blades stacked in an orderly manner on top of the other. The various stacked layers make the proposed embodiment modular, the height becomes adjustable based on the jar. The blades are threaded together in such a way to avoid clashes with the blades above or below their level. Multiple blades at different planar heights but in the same region where the motor operates on the bore will produce greater shearing, cutting, grinding and mixing as the ingredients are being operated on at greater volumes of the jar but the effort expended by the motor to rotate will still be same as it operates on the same bore region alone. A reduced level of rotation can now achieve finer grinding, reducing the rotational speeds of the blades, this will in turn greatly reduce the noise produced due to the rotations. Reduced rotating speeds will also prevent greater heat generation from expending the electromechanical energy to achieve high rotations, moderating and maintaining the temperature, preventing temperature increases that are dramatic and undesirable. The proposed improvement can be easily removed and therefore easily cleaned, the blade leaves can be separately and carefully cleaned easily neutralising any potential injury inducing scenario due to blades being hard to reach and clean. As a consequence of the proposed improved embodiment’s application the problems identified in main application are addressed to a more satisfying degree while delivering additional performance enhancements while not pumping up the cost of operation or maintenance.

OBJECTS OF THE INVENTION

The primary object of the present invention is to provide the mixer grinder jar with tower-blades that are mountable.

It is another object of the present invention to provide the mixer grinder jar with tower-blades that can have multiple leaves of blades threaded at measured intervals one on top of the other.

It is another object of the present invention to provide a blade assembly that is easy and safe to handle and to clean by virtue of being mountable.

It is another object of the present invention to provide a blade assembly that can rotate at much lower speeds to achieve finer grinding of input ingredients of various viscosities and coarseness.

It is another object of the present invention to reduce noise pollution of the mixer grinder due to lower rotation speeds of the blades.

Yet another object of the present invention is to reduce the temperature of the operating environment within the mixer grinder jar by rotating at slower speeds.

Another object of the present invention is to reduce the heat generation, as operating at slower speeds, the blades shall not expend more electromechanical energy.

Another object of the present invention is to preserve heterofermentative bacteria in batter preparation due to moderation of temperature.

Also, another object of the present invention is to consume relatively lesser power to operate the tower-blades to deliver better quality outputs.

SUMMARY OF THE INVENTION
The present invention provides “a mountable tower blade assembly for an automatic mixer grinder” described in the main patent application. The present invention comprises of plurality of blades that are mounted on top of one another. It is proposed to have multiple leaves of blades stacked in an orderly manner on top of the other. The various stacked layers of blades make the proposed embodiment modular and the height of the blades can be adjustable based on the jar. The blades are threaded together on the bore region of the mixer grinder.

Other features and advantages of embodiments will be apparent from the accompanying drawings and from the detailed description that follows.

BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 illustrates side elevation of the blade arrangement in accordance with the present invention.
Fig. 2 illustrates an arrangement of the blade in accordance with the present invention.

While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the invention.

DETAILED DESCRIPTION OF THE PRESENT INVENTION
The present invention as embodied by “Mountable tower blade assembly for an automatic mixer grinder”, which is an improvement of the main patent application "Automatic mixer grinder with noise mitigation" succinctly fulfils the above-mentioned need(s) in the art. The present invention has objective(s) arising as a result of the above-mentioned need(s), said objective(s) being enumerated below. In as much as the objective(s) of the present invention are enumerated, it will be obvious to a person skilled in the art that, the enumerated objective(s) are not exhaustive of the present invention in its entirety, and are enclosed solely for the purpose of illustration. Further, the present invention encloses within its scope and purview, any structural alternative(s) and/or any functional equivalent(s) even though, such structural alternative(s) and/or any functional equivalent(s) are not mentioned explicitly herein or elsewhere, in the present disclosure. The present invention therefore encompasses also, any improvisation(s)/ modification(s) applied to the structural alternative(s)/functional alternative(s) within its scope and purview. The present invention may be embodied in other specific form(s) without departing from the spirit or essential attributes thereof. Throughout this specification, the use of the word "comprise" and variations such as "comprises" and "comprising" may imply the inclusion of an element or elements not specifically recited.

From the above drawings and description, it has been made clear that mixer grinder jars have blades to help carry out cutting, mixing, sharing, grinding etc. to wear down compounds of various sizes, viscosities, and coarseness. The number of blade leaves have also been modified to better carry out these processes but the concept of mounting detachable blades, blades that can be threaded, has been introduced with this proposed improvement to main application to carry out the grinding processes without increasing the energy requirement.

The present invention provides a mountable tower blade assembly in an automatic mixer grinder. The present invention comprises of plurality of modular blades (11) that are mountable over one another. The tower blades are detachable. The mountable blades (11) operate on the same bore (12) region as the blades at the lowest plane, as this will require the same electromechanical energy to be expended by the motor. The motor rotates the base bore and not the blades, and the blades (11) are affixed to the bore (12).

In the preferred embodiment of the present invention, wherein the blades are threaded for mounting or stacking purposes and can be easily removed. Each modular blade (11) has a threaded hole at the base and a threaded spindle on top. Each blade is reverse threaded onto the lower modular blade’s threaded spindle and thus stacked one above the other. The removeable blades are easy and safe to clean. The blades maybe of the same size or of different sizes in order to create a better vortex during the grinding process.

In the preferred embodiment of the present invention, wherein the blades (11) rotate at much slower speeds, and the force-multiplier effect through the number of blade-leaves and layers carry out the work that sharper blades with faster rotations would have over multiple rounds. Due to the slower rotation of the blades, it has been observed that these mixer grinders can reduce the amount of noise pollution from rotational processes. The maximum volume observed is to be 69db and is much lower than what conventional jars produce while rotating at speeds of 18000-22000 rotations per minute (RPM).

It is a well-known fact that the Indian families due to their consumption patterns are pre-disposed towards using the mixer grinder more frequently and for grinding more varied ingredients ranging from pulses, grains, rice, wheat to fruits and vegetables and spices. The nature of batter is altered by the presence of a bacteria known as hetero-fermentative bacteria. These batters are used for many staple dishes such as idly/dosa/ and other varieties. The batters’ quality is determined by the presence of the above-mentioned bacteria, the hetero-fermentative bacterium emits lactic acid and carbon-di-oxide that help the batter to rise up and reach the ready-to-cook stage. These bacteria can only thrive at temperatures ranging between 29 degree Celsius and 30 degree Celsius.

Due to increased rotational speeds of the conventional blades and multiple rotational cycles for one set of compounds to achieve finer grinding, greater heat is generated, increasing the ambient temperature to around 35 degree Celsius to 40 degree Celsius. This increased temperature converts the hetero-fermentative bacteria to homo-fermentative and cancels its function of releasing carbon-di-oxide, which in turn inhibits the batter from rising up and thus results in degrading its overall quality. Most users resort to the addition of baking soda to batter to work around this pitfall.

The present invention overcomes the above-mentioned drawback by generating less heat during the grinding process by means of the stackable tower blade assembly. This ability of the present invention to retain the nature of the hetero-fermentative bacteria enables in cutting down the usage of baking soda and the mixer grinder itself shall not require any additional power to deliver this. This shall serve as a great kitchen-friendly and satisfying embodiment.

Advantages of the present invention
• Enables reduced rotational speeds and thus lowers the temperature and the noise pollution.
• The mountable blades are easier and safer to clean.
• Produces the same grinding effect of high speed rotating blades but at slower speed and thus consumes less power.
Operation of tower blade is multifunctional and can be used for but not limited to Churning, Vegetable chopping, Coconut shredding and Cake batter preparation.

The above advantages along with main application help in achieving the solutions to the problems identified in existing systems. This along with additional benefits of preservation of vital hetero-fermentative bacteria from reduced temperature ranges, multiple variants of blades and the modularity of the blades themselves help elevate the overall proposed invention in main application.

Although the proposed concept has been described as a way of example with reference to various models, it is not limited to the disclosed embodiment and that alternative designs could be constructed without deviating from the scope of invention as defined above.
, Claims:We claim,
1. A mountable tower blade assembly for an automatic mixer grinder, comprising of:
a plurality of blades (11) wherein the blades are detachably mounted or stacked on top of one another, wherein the mountable blades (11) operate on the same bore (12) region as the blades at the lowest plane in the mixer grinder.

2. The mountable tower blade assembly for an automatic mixer grinder as claimed in claim 1, wherein each modular blade (11) has a threaded hole at the base and a threaded spindle on top, wherein each blade (11) is reverse threaded onto the lower blade’s (11) threaded spindle for mounting or stacking purposes and can be easily removed.

3. The mountable tower blade assembly for an automatic mixer grinder as claimed in claim 1, wherein the height of the blades (11) can be adjusted.

4. The mountable tower blade assembly for an automatic mixer grinder as claimed in claim 1, wherein the blades (11) are of similar or different sizes.