FIELD OF THE INVENTION:
This invention relates to an improved table top wet grinder.
BACKGROUND:
A Table Top Wet Grinder is generally used to grind rice, lentil for making of idly, wada, dosa, chapathi and many more delicious items in our kitchen such as kurma, masala, chutney, etc.
Grinding is done in wet grinder as following:
a. AC Induction Motor is a motor which induces magnetic field by applying A.C
Supply to it.
b. By magnetic field, the motor rotates and a belt is coupled to the motor by
means of Pulley.
c. Pulley is grooved to enclose a belt with it.
d. The other end of the belt is made in contact with the Wheel of Grinder.
e. Wheel of Wet grinder is made coupled to the Stone Adaptor which is attached
to the base Stone of Drum.
f. Drum also rotates as it is in contact with the Wheel. By this Conical Stones
rotates by movement of Base Stone.
g. Conical Stones remain Constant in their position but the roller Stones rotate
by coupling mechanism.
This would be the basic principle of all the commercial wet grinders available in the market. But they are few drawbacks which seem to be minor but leads to serious destruction in future.

DISCUSSION OF PRIOR ART:
There are a number of Indian patents such as 179607, 206799, 208663 and 240808 which provide different types of wet grinders. However, the known wet grinders have some demerits which can be summarized as follows:
The grinding stones which periodically rotates several times to lose its tiny parts of Stone and this may not be that effective to grind the material and to be taken by the human as it would be very harmful for the Being.
a. By the cylindrical stones also, time which is consumed would be almost more
than half an hour for grinding hard materials like rice.
b. Grinders would be generally noisy (80 db to 100 db) because of the stones
rubbing and it leads to a disturbance for surrounding people.
c. The efficiency of the grinder depends on how good the batter is. In similar
way, grinder is preferred to give its optimum performance in grinding the
complete material equally whereas in Mixer grinder you can grind the
material several times but the batter efficiency of each individual would be
uneven. The power consumed for the Mixer grinder would be almost four
times that of Wet grinder.
d. Hence only Wet grinder is preferred.
SUMMARY OF THE INVENTION:
To overcome the various demerits, the present invention proposes an improved wet grinder. The improvements can be summarized as follows:
a. In our Wet Grinder instead of Cylindrical Roller Stones, we are implementing three Conical Stones. Conical Stones are very smaller in size and also easy for the being to lift it and place it aside.

b. The Conical Stones are designed in such a way that the center of the maximum
diameter and minimum diameter is perpendicular to the top and bottom
diameter of the stone.
c. Roller Assembly is made in such a way that the cone which is used to hold the
rods of the base cone is arranged in such a way that the angle of the rods is
equally divided and the distance from the center of the hole of the rod is
equivalent to the Radius of maximum diameter of the Conical Stone.
d. Hence forth, there would be perfect rotation of roller stones.
e. By usage of three Conical Stones, the grinding time would be decreased and
the grinding efficiency is much better than the cylindrical rollers.
f. Power consumption for the three Conical Stones would be less as the time
taken to grind the material is less. Hence our model is a Power Saving Wet
Grinder.
The main Objective of our grinder is to make the grinding time less and by implementation of the three Conical Stones the power consumption should also be less.
There will be no much rubbing action developed in the conical Stones and by which wear and tear of the material also decreases and also it is very good for Human Health.
♦♦♦ Conical Stones are placed in such a way that the Angle maintained for the conical stone is 120°. The Conical Stone which is maintained at an angle to the Base Stone allows the Grinding material to grind the material into the Steel Drum.

♦ By Usage of Three Conical Stones, We are avoiding Wiper in this grinder as the Third Conical Stone acts as the Wiper for the Grinder and allows maximum of the material to be grinded perfectly.
♦ SS Spring is placed in the Assembly in between the locking top fitment and Female Square for keeping roller assembly with proper tension and locking.
♦ Lid will be placed on the top of the Grinder Arm to cover complete drum.
BRIEF DESCRIPTION OF DRAWINGS
This invention will now be described with reference to the accompanying drawings, wherein:
Figure 1 illustrates the exploded view of the wet grinder;
Figure 2 illustrates the top view of the stones;
Figure 3 illustrates the front view of the stones;
Figure 4 illustrates the view of the steel drum, lid and the stones;
Figure 5 illustrates the cross sectional view of the wet grinder; and
Figure 6 illustrates the top view of the wet grinder without the lid.
DETAILED DESCRIPTION OF THE INVENTION
The Wet Grinder of the present invention comprises of a Main Housing 1, which has a Motor Housing 1A for Motor 2 on one side and a Round Base 3 for housing the Steel Drum 4 and a Pillar 5 with an Arm 6 for locking the Steel Drum 4 in place. The Steel Drum 4 is fixed with a Base Stone 7 and a Male Round 8 for placing a Holder 9

on which a set of three Conical Stones 10 are fixed. The Round Base 3 is provided with a Base Holder 11 on which the Male Round 8 sits.
The Motor 2 is placed in the Housing 1A and closed with a Motor Top 12 which houses a Locking Switch 13 and an Arm Locking System 14. The Male Round 8 is in couple with a Driven Pulley 15 which in turn is in couple with the Wheel Mounting Plate 16 which has a bearing placed outside of the same. The Driven Pulley 15 is driven by Motor Pulley 17 through the Driven Belt 18. The Driven Pulley 15 is housed in the bottom of the main housing and is secured with a Bottom Plate 19.
The Arm 6 is fixed with an MS strip 21 and has a Locking Top Fitment 22 provided in the Arm Bottom 23. The Top Fitment 22 has a Spring 24 and a Female Square 25. Lid 26 is provided to close the Steel Drum 4. The set of Conical Stones 10 have Stone Grooves 27 which are provided for grinding.
The Conical Stones 10 are fixed to the Holder 9 with the help of Stone Rod 28.
Major visible parts of the Wet Grinder are Main Housing 1, Bottom Plate 19, Motor Top 12 - to cover the Motor 2, Lid 26 - to close the Steel Drum 4, Arm Top 6, Arm Bottom 23 - for locking the holder with a Locking Top Fitment 22, Holder 9 - for holding the Conical Stones Set 10, Locking Switch 13 for opening the Arm Top 6 and Bottom 23. To cover the Main Housing 1, Base Holder 11 is used and Male Round 8 covers the gap between Driven Pulley 15 and Round Base 3.
The set of Conical Stones 10 are placed at an angle of 120° to each other by which arrangement, the stress applied is equally disbursed to all the three stones. This improves the grinding performance. The grinding efficiency will be better if the depth of the grooves 27 is more.
Steel Drum 4 is placed on the main housing 1 for the rotation. When the Wet Grinder is in motion, Steel Drum rotates by which the Base Stone 7 also rotates due to

factional force between the Conical Stone set 10 and Base Stone 7. Stones set also rotate.
The Holder 9 is supported by the spring force at its center. The angle made between the axis of mounting of the Conical Stone 10 and the Base Stone 7. The Conical Stones 10 are designed in such a way that the center of the maximum and minimum diameter of the rollers is in perpendicular to that of the center of the Roller Pin Holder and to the axes of the maximum and minimum diameter surface. The force on the Conical Stone is equal throughout the length and width, so wear rate is even throughout the length and width and heat generation is less.
The arrangement of the arm with the help of the springs helps to apply the force equally on the Roller Stones which are separated by 120° from each other.
The Holder 9 which has the Conical Stones 10 are supported by means of Female Square 25 and Spring 24, due to which the force applied on the Holder 9 is decreased as the stress applied is equally distributed.
If force exerted is 'F' and the area of contact with the Base Stone 7 by a Conical Stone 10 is A. Stress is defined as the ratio of force exerted to that of area of cross section. If the Roller Stones are two, stress applied will be F/2A.If the Conical Stones 10 are three, stress applied on the Holder will be F/3A. Hence, the stress applied on the three Conical Stones is lesser which results in free movement of Roller Stone and thus increasing the grinding efficiency of the Wet Grinder and there by grinding time is reduced and also the power consumption would be less.
Accomplishments of this invention:
♦ Conical Stones are placed in the Holder in such a way that the angle between the three Roller Stones maintains 120°. By this invention spring stress will be equally distributed and the area of contact of the conical stone and base stone is also increased.

♦ Efficient grinding and reduced grinding time by which lesser power Consumption.
♦ Less wear and tear of materials.
The distinct features of our present invention wet grinder are as follows:
1. Force Distribution and Better Grinding performance.
a. The force exerted by the holder on the three conical stones and on the base stone disburse is equal at all sides. To achieve this, the rolling stones are placed 120° from each other such that the force exerted by the holder by the spring is equally disbursed to all the three roller stones. By this stress is decreased on the Holder.
2. More Area of Contact and Reduced Grinding Time.
a. Area of contacting surface will be more in the three conical stones as
compared to that of two stones. By this raw material gets crushed in between
the base stone and conical stone faster than that of two stones. Due to which
the grinding time is reduced and thereof lesser power consumption.
b. If Force exerted is 'F' and the Area of Contact with the base stone by a rolling
stone is A. Stress is defined as the ratio of force exerted to that of area of cross
section. If the roller stones are two in number, stress applied will be F/2A.If
the roller stones are three, stress applied on the holder will be F/3A.
Henceforth, stress applied on the three roller stones is lesser which results in
free movement of roller stone and thus increasing the grinding efficiency of
the Wet Grinder.
3. No Wear & Tear of Material & Quality Output.
a. During grinding, the roller stones and the base stone friction undergo relative motion which causes both rubbing and rolling action in between the surfaces. Due to the rolling action, equivalent forces will be applied on the holder.

Heat generated will be lesser as compared in three conical stones to that of the two cylindrical stones with unbalanced stress. As the stress applied on the holder is less with balanced force on it. Heat generation will be less which increases the life time of the roller stones and that of motor.
b. Due to rubbing action, the material of the base stone and that of the rollers
will be in rapid contact due to which the stone material may peel off and may
mix up with the grinding material which is very harmful. To overcome this,
we have used three conical stones in which the half of the included angle of
the cone is equivalent to that of the angle made between the axis of mounting
of the conical roller stone and the base stone. The conical rollers are designed
in such a way that the center of the maximum and minimum diameter of the
rollers is in perpendicular to that of the center of the roller pin holder and to
the axes of the maximum and minimum diameter surface.
c. Due to less rubbing action, rolling action, less wear and tear of material we
can ensure quality output by which grinding performance is good.

WE CLAIM:
1. An improved Wet Grinder comprising of a Motor 2, Detachable Steel Drum 4 placed in a Main Housing 1 with Bottom Plate 19, said Steel Drum includes a Base Stone 7, Male Round 8 for a Holder 9, said Holder being made of Stainless Steel, Conical Stones Set 10, characterized in that the Conical Stones Set 10 are placed on the Base Stone 7 at 120° from each other, a locking top fitment 22 having a Spring 24 and a Female Square 25, the holder 9 is fixed with three stone rods 28 maintained at an angle of 120° with each other, the conical stone set 10 being arranged in such a way that the Half of the included angle of the cone is equivalent to that of the angle made by base stone 7 with the conical stone 10.
2. An improved wet grinder as claimed in claim 1, wherein the holder 9 with three stone rods is designed in such a way that the minimum and maximum dia of the conical stone set 10 rests on the base stone 7 with minimum 3mm groove depth in the conical stones.
3. An improved wet grinder as claimed in claim 1, wherein the Main Housing 1, Bottom plate 19, Arm top 6 Arm Bottom 23, Lid 26 are made of Plastic with sufficient ribs for its strength.
4. An improved wet grinder as claimed in claim 1, wherein the Bottom plate 23 rests on Buffers which are made with natural rubber.
5. An improved wet grinder claimed in claim 1, with or without wiper in place.

6. An improved wet grinder substantially as herein described and illustrated in Figs. 1 to 6 of the accompanying drawings.

FIELD OF THE INVENTION:
This invention relates to an improved table top wet grinder.
BACKGROUND:
A Table Top Wet Grinder is generally used to grind rice, lentil for making of idly, wada, dosa, chapathi and many more delicious items in our kitchen such as kurma, masala, chutney, etc.
Grinding is done in wet grinder as following:
a. AC Induction Motor is a motor which induces magnetic field by applying A.C
Supply to it.
b. By magnetic field, the motor rotates and a belt is coupled to the motor by
means of Pulley.
c. Pulley is grooved to enclose a belt with it.
d. The other end of the belt is made in contact with the Wheel of Grinder.
e. Wheel of Wet grinder is made coupled to the Stone Adaptor which is attached
to the base Stone of Drum.
f. Drum also rotates as it is in contact with the Wheel. By this Conical Stones
rotates by movement of Base Stone.
g. Conical Stones remain Constant in their position but the roller Stones rotate
by coupling mechanism.
This would be the basic principle of all the commercial wet grinders available in the market. But they are few drawbacks which seem to be minor but leads to serious destruction in future.

DISCUSSION OF PRIOR ART:
There are a number of Indian patents such as 179607, 206799, 208663 and 240808 which provide different types of wet grinders. However, the known wet grinders have some demerits which can be summarized as follows:
The grinding stones which periodically rotates several times to lose its tiny parts of Stone and this may not be that effective to grind the material and to be taken by the human as it would be very harmful for the Being.
a. By the cylindrical stones also, time which is consumed would be almost more
than half an hour for grinding hard materials like rice.
b. Grinders would be generally noisy (80 db to 100 db) because of the stones
rubbing and it leads to a disturbance for surrounding people.
c. The efficiency of the grinder depends on how good the batter is. In similar
way, grinder is preferred to give its optimum performance in grinding the
complete material equally whereas in Mixer grinder you can grind the
material several times but the batter efficiency of each individual would be
uneven. The power consumed for the Mixer grinder would be almost four
times that of Wet grinder.
d. Hence only Wet grinder is preferred.
SUMMARY OF THE INVENTION:
To overcome the various demerits, the present invention proposes an improved wet grinder. The improvements can be summarized as follows:
a. In our Wet Grinder instead of Cylindrical Roller Stones, we are implementing three Conical Stones. Conical Stones are very smaller in size and also easy for the being to lift it and place it aside.

b. The Conical Stones are designed in such a way that the center of the maximum
diameter and minimum diameter is perpendicular to the top and bottom
diameter of the stone.
c. Roller Assembly is made in such a way that the cone which is used to hold the
rods of the base cone is arranged in such a way that the angle of the rods is
equally divided and the distance from the center of the hole of the rod is
equivalent to the Radius of maximum diameter of the Conical Stone.
d. Hence forth, there would be perfect rotation of roller stones.
e. By usage of three Conical Stones, the grinding time would be decreased and
the grinding efficiency is much better than the cylindrical rollers.
f. Power consumption for the three Conical Stones would be less as the time
taken to grind the material is less. Hence our model is a Power Saving Wet
Grinder.
The main Objective of our grinder is to make the grinding time less and by implementation of the three Conical Stones the power consumption should also be less.
There will be no much rubbing action developed in the conical Stones and by which wear and tear of the material also decreases and also it is very good for Human Health.
♦♦♦ Conical Stones are placed in such a way that the Angle maintained for the conical stone is 120°. The Conical Stone which is maintained at an angle to the Base Stone allows the Grinding material to grind the material into the Steel Drum.

♦ By Usage of Three Conical Stones, We are avoiding Wiper in this grinder as the Third Conical Stone acts as the Wiper for the Grinder and allows maximum of the material to be grinded perfectly.
♦ SS Spring is placed in the Assembly in between the locking top fitment and Female Square for keeping roller assembly with proper tension and locking.
♦ Lid will be placed on the top of the Grinder Arm to cover complete drum.
BRIEF DESCRIPTION OF DRAWINGS
This invention will now be described with reference to the accompanying drawings, wherein:
Figure 1 illustrates the exploded view of the wet grinder;
Figure 2 illustrates the top view of the stones;
Figure 3 illustrates the front view of the stones;
Figure 4 illustrates the view of the steel drum, lid and the stones;
Figure 5 illustrates the cross sectional view of the wet grinder; and
Figure 6 illustrates the top view of the wet grinder without the lid.
DETAILED DESCRIPTION OF THE INVENTION
The Wet Grinder of the present invention comprises of a Main Housing 1, which has a Motor Housing 1A for Motor 2 on one side and a Round Base 3 for housing the Steel Drum 4 and a Pillar 5 with an Arm 6 for locking the Steel Drum 4 in place. The Steel Drum 4 is fixed with a Base Stone 7 and a Male Round 8 for placing a Holder 9

on which a set of three Conical Stones 10 are fixed. The Round Base 3 is provided with a Base Holder 11 on which the Male Round 8 sits.
The Motor 2 is placed in the Housing 1A and closed with a Motor Top 12 which houses a Locking Switch 13 and an Arm Locking System 14. The Male Round 8 is in couple with a Driven Pulley 15 which in turn is in couple with the Wheel Mounting Plate 16 which has a bearing placed outside of the same. The Driven Pulley 15 is driven by Motor Pulley 17 through the Driven Belt 18. The Driven Pulley 15 is housed in the bottom of the main housing and is secured with a Bottom Plate 19.
The Arm 6 is fixed with an MS strip 21 and has a Locking Top Fitment 22 provided in the Arm Bottom 23. The Top Fitment 22 has a Spring 24 and a Female Square 25. Lid 26 is provided to close the Steel Drum 4. The set of Conical Stones 10 have Stone Grooves 27 which are provided for grinding.
The Conical Stones 10 are fixed to the Holder 9 with the help of Stone Rod 28.
Major visible parts of the Wet Grinder are Main Housing 1, Bottom Plate 19, Motor Top 12 - to cover the Motor 2, Lid 26 - to close the Steel Drum 4, Arm Top 6, Arm Bottom 23 - for locking the holder with a Locking Top Fitment 22, Holder 9 - for holding the Conical Stones Set 10, Locking Switch 13 for opening the Arm Top 6 and Bottom 23. To cover the Main Housing 1, Base Holder 11 is used and Male Round 8 covers the gap between Driven Pulley 15 and Round Base 3.
The set of Conical Stones 10 are placed at an angle of 120° to each other by which arrangement, the stress applied is equally disbursed to all the three stones. This improves the grinding performance. The grinding efficiency will be better if the depth of the grooves 27 is more.
Steel Drum 4 is placed on the main housing 1 for the rotation. When the Wet Grinder is in motion, Steel Drum rotates by which the Base Stone 7 also rotates due to

factional force between the Conical Stone set 10 and Base Stone 7. Stones set also rotate.
The Holder 9 is supported by the spring force at its center. The angle made between the axis of mounting of the Conical Stone 10 and the Base Stone 7. The Conical Stones 10 are designed in such a way that the center of the maximum and minimum diameter of the rollers is in perpendicular to that of the center of the Roller Pin Holder and to the axes of the maximum and minimum diameter surface. The force on the Conical Stone is equal throughout the length and width, so wear rate is even throughout the length and width and heat generation is less.
The arrangement of the arm with the help of the springs helps to apply the force equally on the Roller Stones which are separated by 120° from each other.
The Holder 9 which has the Conical Stones 10 are supported by means of Female Square 25 and Spring 24, due to which the force applied on the Holder 9 is decreased as the stress applied is equally distributed.
If force exerted is 'F' and the area of contact with the Base Stone 7 by a Conical Stone 10 is A. Stress is defined as the ratio of force exerted to that of area of cross section. If the Roller Stones are two, stress applied will be F/2A.If the Conical Stones 10 are three, stress applied on the Holder will be F/3A. Hence, the stress applied on the three Conical Stones is lesser which results in free movement of Roller Stone and thus increasing the grinding efficiency of the Wet Grinder and there by grinding time is reduced and also the power consumption would be less.
Accomplishments of this invention:
♦ Conical Stones are placed in the Holder in such a way that the angle between the three Roller Stones maintains 120°. By this invention spring stress will be equally distributed and the area of contact of the conical stone and base stone is also increased.

♦ Efficient grinding and reduced grinding time by which lesser power Consumption.
♦ Less wear and tear of materials.
The distinct features of our present invention wet grinder are as follows:
1. Force Distribution and Better Grinding performance.
a. The force exerted by the holder on the three conical stones and on the base stone disburse is equal at all sides. To achieve this, the rolling stones are placed 120° from each other such that the force exerted by the holder by the spring is equally disbursed to all the three roller stones. By this stress is decreased on the Holder.
2. More Area of Contact and Reduced Grinding Time.
a. Area of contacting surface will be more in the three conical stones as
compared to that of two stones. By this raw material gets crushed in between
the base stone and conical stone faster than that of two stones. Due to which
the grinding time is reduced and thereof lesser power consumption.
b. If Force exerted is 'F' and the Area of Contact with the base stone by a rolling
stone is A. Stress is defined as the ratio of force exerted to that of area of cross
section. If the roller stones are two in number, stress applied will be F/2A.If
the roller stones are three, stress applied on the holder will be F/3A.
Henceforth, stress applied on the three roller stones is lesser which results in
free movement of roller stone and thus increasing the grinding efficiency of
the Wet Grinder.
3. No Wear & Tear of Material & Quality Output.
a. During grinding, the roller stones and the base stone friction undergo relative motion which causes both rubbing and rolling action in between the surfaces. Due to the rolling action, equivalent forces will be applied on the holder.

Heat generated will be lesser as compared in three conical stones to that of the two cylindrical stones with unbalanced stress. As the stress applied on the holder is less with balanced force on it. Heat generation will be less which increases the life time of the roller stones and that of motor.
b. Due to rubbing action, the material of the base stone and that of the rollers
will be in rapid contact due to which the stone material may peel off and may
mix up with the grinding material which is very harmful. To overcome this,
we have used three conical stones in which the half of the included angle of
the cone is equivalent to that of the angle made between the axis of mounting
of the conical roller stone and the base stone. The conical rollers are designed
in such a way that the center of the maximum and minimum diameter of the
rollers is in perpendicular to that of the center of the roller pin holder and to
the axes of the maximum and minimum diameter surface.
c. Due to less rubbing action, rolling action, less wear and tear of material we
can ensure quality output by which grinding performance is good.

WE CLAIM:
1. An improved Wet Grinder comprising of a Motor 2, Detachable Steel Drum 4 placed in a Main Housing 1 with Bottom Plate 19, said Steel Drum includes a Base Stone 7, Male Round 8 for a Holder 9, said Holder being made of Stainless Steel, Conical Stones Set 10, characterized in that the Conical Stones Set 10 are placed on the Base Stone 7 at 120° from each other, a locking top fitment 22 having a Spring 24 and a Female Square 25, the holder 9 is fixed with three stone rods 28 maintained at an angle of 120° with each other, the conical stone set 10 being arranged in such a way that the Half of the included angle of the cone is equivalent to that of the angle made by base stone 7 with the conical stone 10.
2. An improved wet grinder as claimed in claim 1, wherein the holder 9 with three stone rods is designed in such a way that the minimum and maximum dia of the conical stone set 10 rests on the base stone 7 with minimum 3mm groove depth in the conical stones.
3. An improved wet grinder as claimed in claim 1, wherein the Main Housing 1, Bottom plate 19, Arm top 6 Arm Bottom 23, Lid 26 are made of Plastic with sufficient ribs for its strength.
4. An improved wet grinder as claimed in claim 1, wherein the Bottom plate 23 rests on Buffers which are made with natural rubber.
5. An improved wet grinder claimed in claim 1, with or without wiper in place.

6. An improved wet grinder substantially as herein described and illustrated in Figs. 1 to 6 of the accompanying drawings.