FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"Rotary Shaker"
2. APPLICANT
(a) NAME: Madhav Shivram Sapar
(b) NATIONALITY: Indian Nationals
(c) ADDRESS: Plot No. 74-84/19, Ram Tekdi,
Industrial Estate. Hadapsar, Pune -13, M.S. India
3. PRREAMBLE TO THE DESCRIPTION
PROVISIONAL COMPLETE
The following specification
particularly describes the invention and
the manner in which it is to be
performed.

Field of the invention
The present invention relates to a rotary shaker for shaking laboratory containers, such as flasks, beakers, and the like.
Background of the invention
The rotary shaker is equipment mostly required in laboratories for constantly shaking the containers or flasks, beakers or such containers placed on the platform of the same. The shaking is necessary so as to complete the chemical, reactions or complete the development of biological process or growth. Such growth would not take place satisfactorily in stationary flasks, beakers or containers. Further, it is observed that if the contents are constantly shaked, the development of or growth of the organs in the flask, beaker or container is accomplished at a faster rate thereby saving time. The shaker is therefore necessary equipment in laboratories, in pharmaceutical industry, in biotechnical laboratories or manufacturing units.
There are in existence rotary shakers wherein beakers, flasks and such other containers are placed on the platform which in turn, is supported on a framework and subjected to orbital shaking with the help of only one eccentric pin, which, is rotated by a prime mover. In most cases the prime mover is an electric motor. The eccentric pin is centrally provided and there are three or four steel balls, which provide floating supports for the corners of a frame work, on top of which, there is provided a platform, The four ends or the corners are held with the help of springs arranged, such that when the central eccentric pin rotates, the entire platform, supported on the balls and by the springs, starts shaking in orbital manner so as to accomplish orbital rotary and shaking motion to the containers placed on the platform. Thus, this is in general, the construction and working of the existing rotary shakers. Further, it is observed and experienced by many laboratories that these rotary shakers do not function so well because the entire framework is

supported on the floating balls and secured by springs which tend to wobble and sometimes the contents gets spilled over. To overcome this difficulty, strong clamps are provided but even it is not smooth and not accomplished in satisfactory manner, finally and also not accomplished in satisfactory manner, finally resulting in poor results or the time taken is much more. At times, it is also even necessary to change relative locations of the containers over the platform. This is only because corners of the platform are not properly balanced. Moreover, there is no provision of accommodating variation in the load made up by the flasks or beakers placed on the platform. When the load on platform increases, the shaking action is not proper, more wobbling is observed, in that event lesser number of containers are placed, which creates the necessity of providing more number of shakers. In the existing rotary shakers, also the beakers or containers placed in the platform do not provide the same pattern of shake. It is un-uniform in nature which normally results in un-uniform output.
It is a matter of common observation in the case of existing rotary shakers, that there is invariably required a foundation for the entire equipment as there are observed vibrations during the operation of the rotary shaker because of improper balancing which being the result of eccentric pin.
The existing rotary shaker lacks lubrication system which increases the life and performance of the components.
Objects of the invention
An object of the present invention to provide a rotary shaker, which is capable of rotating smoothly, irrespective of load on the same, thereby offering better service, uniform quality, and better outpour.

Another object of the present invention is to provide a rotary shaker, which works smoothly without vibration such that there will not arise any necessity of providing any foundation.
Summary of the invention
According to the present invention there is provided a rotary shaker for shaking beakers, flasks and the like in a laboratory, the rotary shaker comprising,
a main cabinet capable of enclosing;
a plurality of legs with level adjustment mechanism disposed below the main cabinet for supporting the main cabinet thereof;
a lower plate, a upper plate disposed inside the main cabinet;
a plurality of crank shafts disposed between the lower plate and the upper plate at corners thereof;
a electric motor coupled to a central crank shaft of the plurality of crank shaft positioned centrally for rotating thereof though a main driving pulley by a belt,
a chassis disposed over the upper plate and a upper platform over the chassis;
a plurality of flask holders disposed on the upper platform for holding flask thereover, characterized in that:
a plurality of solid blocks disposed below the lower support and in the main cabinet for supporting each of the crank shaft at the corners;
a first counter weight secured to the crank shaft and a second counter counter weight is secured to a pulley secured to drive the crank shaft by the electric motor, the first counter weight (25) and the second counter weight (14) balance excesses weight of the upper platform (13) eccentrically secured over the central crank shaft (8) for generating revolving motion thereby revolving flask disposed thereover;
a plurality of bearings secured over the crank shafts and to the weight thereover, wherein the bearings absorbs vertical and horizontal load; and

a plurality of cups configured for lubricating the bearings.
Typically, wherein the crank shafts are made of hardened materia],
Brief description of the drawings
The invention will now be described with the help of drawings accompanying this specification wherein salient features have been shown by mutable numerals which in turn are referred to appropriately in the following description.
Figure 1 shows part sectional view of the rotary shaker in accordance with the present invention;
Figure 2 shows top view of the figure 1;
Figure 3 shows vertical sectional elevation of a crank shaft of the rotary shaker of figure 1; and
Figure 4 shows side view of a pulley of rotary shaker of figure 1.
Detail description of the invention
The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiment.
The present invention relates to a rotary shaker for shaking laboratory containers, such as flasks, beakers, and the like. The rotary shaker is capable of rotating smoothly, irrespective of load on the same, thereby offering better service, uniform quality, and better outpour. Further, the rotary shaker works smoothly

without vibration such that there will not arise any necessity of providing any foundation.
The present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in bracket in the following description.
Referring now to figure 1 & 2, various views of the rotary shaker (1) in accordance with the present invention are illustrated. The rotary shaker (1) includes a main cabinet (2), a plurality of legs (3), a level adjustment mechanism (4), a lower plate (11), an upper plate (10), an electric motor (5), a plurality of crank shafts (9), a chassis (12) and a plurality of flask holders (15). The main cabinet (2) is capable of enclosing various elements therein. The main cabinet (2) is provided with legs (3) for example four legs having the level adjustment mechanism (4) secured below each leg (3) for adjusting the level thereof. The crank shafts (9) are disposed between the lower plate (11) and upper plate (10). The lower plate (11) and the upper plate (10) are disposed inside the main cabinet (2), On a central crank shaft (8) of the plurality of crank shaft (9) is secured to the electric motor (5) though a belt and a main driving pulley (6). The chassis (12) is disposed over the upper plate (10) and an upper platform (13) over the chassis (12) for mounting the plurality of flask holders (15) thereover.
Referring again to figures 1, 2, 3 & 4, the improvement comprises a plurality of solid blocks (16), a first counter weight (25), a second counter weight (14), a plurality of bearings (18) and a plurality of cups (17), The first counter weight (25) and the second counter weight (14) balance excesses weight of the upper platform (13) eccentrically secured over the central crank shaft (8) for generating revolving motion thereby revolving flask disposed thereover. The first weight (25) secured to the central crank shaft (8) enables smooth rotation, without vibration, which also increase life of the bearings (18). The solid blocks (16) are disposed

below the lower plate (11) and in the main cabinet (2) for supporting each of the crank shafts (9) at corners of lower plate (11). The solid blocks (16) absorb jerks and enable to uniform agitation to flasks (not shown) secured in the flask holders (J 5) thereby increasing yield of final product in the flasks.
The first weight (25) is secured to the central crank shaft (8) and the second counter weight (14) is disposed on the main driving pulley (6) (shown in figure 4). Further, the crank shafts (8 & 9) are supported by the bearing (18) refer figure 3. The bearings (18) are also secured to the weight (25). The bearings (18) absorbs vertical and horizontal load. In an embodiment, the crank shafts (8 & 9) are made of hardened material. The rotary shaker (1) also, includes the plurality of cups (17) configured for lubricating the bearings (18) thereof.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.

I Claim:
1. A rotary shaker for shaking beakers, flasks and the like in a laboratory, the rotary shaker comprising,
a main cabinet (2);
a plurality of legs (3) with level adjustment mechanism (4) disposed below the main cabinet (2) for supporting the main cabinet (2) thereof;
a lower plate (11). a upper plate (10) disposed inside the main cabinet (2);
a plurality of crank shafts (9) disposed between the lower plate (11) and the upper plate (10) at corners thereof;
a electric motor (5) coupled to a central crank shaft (8) of the plurality of crank shaft (9) positioned centrally for rotating thereof though a main driving pulley (6) by a belt,
a chassis (12) disposed over the upper plate (10) and a upper platform (13) over the chassis (12);
a plurality of flask holders (15) disposed on the upper platform for holding flask thereover, characterized in that:
a plurality of solid blocks (16) disposed below the lower support (11) and in the main cabinet (2) for supporting each of the crank shaft (9) at the corners;
a first counter weight (25) secured to the crank shaft (8) and a second counter weight (14) is secured to a pulley secured to drive the crank shaft (8) by the electric motor (5), the first counter weight (25) and the second counter weight (14) balance excesses weight of the upper platform (13) eccentrically secured over the central crank shaft (8) for generating revolving motion thereby revolving flask disposed thereover;
a plurality of bearings (18) secured over the crank shafts (9) and to the first weight (25) thereover, wherein the bearings (18) absorbs vertical and horizontal load; and
a plurality of cups (17) configured for lubricating the bearings (18).

2. The rotary shaker as claimed in claim 1, wherein the crank shafts are made of hardened material.