1. An improved ice tray for fast ice making in direct cool refrigerator comprising of a plurality of spaced apart cavities having protrusion for better conduction and a plurality of holes between said cavities for convention wherein said ice tray is made of stiff resilient plastic material.

2. An improved ice tray as claimed in claim 1 wherein said protrusion is having preferably dome shape, which increases the surface area resulting in better conduction.

3. An improved ice tray as claimed in claim 1 or 2 wherein said holes facilitate air flow from bottom leading to improved convection for fast cooling.

4. An improved ice tray as claimed in any of the preceding claims wherein said stiff resilient plastic material comprising of compound containing polypropylene (PP) and for ex. 20% of Aluminium.

5. An improved ice tray for fast ice making in direct cool refrigerator substantially as herein described with reference to the accompanying drawings.

FIELD OF INVENTION
This invention relates to an improved ice tray for fast ice making in direct cool Refrigerator.
PRIOR ART
Ice tray is known to have been provided in the art. However, the disadvantage associated with the same it that, it consumes more time to make ice due to poor Heat Transfer and Cooling.
The related Patents are discussed hereinbelow:
US 3844525 relating to a one-piece freezing tray having at least one molding compartment for forming ice cubes. The tray is comprised of a flexible material and the compartment has a horizontally disposed mouth at the uppermost end of the compartment. The compartment has integrally formed in the lowermost wall thereof a projection depending from the outer surface thereof. An ice cube is removed from the compartment by placing the projection against a hard surface and pressing the mouth towards the projection to deform the lowermost surface of the compartment which urges the ice cube out of the compartment (Patent For Ice Removing Technique).
A machine for making flaked ice, comprising of
a) a water system comprising at least one inlet, a level control inlet valve and an independently operated valve operably connected to the inlet, the valves in series with the inlet of reservoir for receiving water from the inlet and the valves, the reservoir also containing at least one water outlet, a freezing cylinder communicating with the

water reservoir, the freezing cylinder further comprising an auger having a screw edge and a motor for rotating the auger, and a discharge valve;
b) a refrigeration system comprising a compressor, a condenser, an expansion device and cooling coils in heat transfer relationship with the freezing cylinder for receiving coolant from the expansion device to cool water from the water system; and
c) a microprocessor based controlled for controlling the independently operated inlet valve.
Patent for Ice making Machine and Units
Still further, reference may be made to an auger type ice making machine having an upright evaporator housing the interior of which is formed with a cylindrical freezing surface, an auger mounted for rotary movement within the evaporator housing and drivingly connected at its lower end with an electrimotor to scrape ice crystals off the freezing surface and to advance the scrapped ice crystals off the freezing surface and to advance the scrapped ice crystals towards an upper end of the evaporator housing, an extrusion head fixed in placed within the upper end portion of the evaporator housing to compress the ice crystals advanced thereto by rotation of the auger and extrude the compressed ice crystals upwardly, a discharge pipe provided with an electrically operated drain valve and connected to a lower end portion of the evaporator housing to discharge supplied water from the evaporator housing when the drain valve is opened by its energization, an electric heater mounted on an outer periphery of the evaporator housing at a place corresponding with the extrusion

heads, detection means for issuing a halt signal of ice making operation of the machine when an ice storage bin of the machine is filled with the ice supplied with the evaporator housing, and control means for halting the electric motor when applied with the halt signal wherein said control means comprises means for energizing said electric heater when applied with the halt signal from said detection means and means for deenergizing said electric heater after lapse of a predetermined time and for energizing said drain valve after or before lapse of the predetermined time.
(Patent for Ice making Machine and Units)
Further, an ice making apparatus is known in the art comprising of a plurality of generally straight evaporator tubes; drive means located adjacent said evaporator tubes; means for supplying water to the exterior surfaces of said evaporator tubes; means for supplying refrigerant to the interiors of said evaporator tubes; so that evaporation takes place within said tubes to causes the freezing of tubes of ice on exterior surfaces of said evaporator tubes; means for heating said evaporator tubes above the freezing point of water to free the ice tubes from their bonds to said evaporator tubes following discontinuation of supply of refrigerant to and evaporation of refrigerant within said evaporator tubes, means for operating said drive means to move the ice tubes along and off of said evaporator tubes; and means for fracturing the leasing ends of the ice tubes into smaller ice pieces as the ice tubes move off of said evaporator tubes.

Again, it is known to have been provide an apparatus for making ice from water comprising: a refrigerated element having at least two sides, at least one flexible ice forming membrane on each said side of the refrigerated element, and means for flexing said membranes into and out of contact with said sides of the refrigerated element whereby said ice forms on said membranes are flexed into contact with said refrigerated elements, and said ice is detached from said membranes when said membranes are flexed out of contact with said refrigerated element.
Patent Related to the Evaporator and Ice making Unit
US 5749242: An evaporator having a tortuous refrigerant flow path for use in an ice making machine. The evaporator includes a first tubular member having a closed bottom end and a closed top end with a first aperture. A second tubular member is concentrically positioned within the first tubular member. The second tubular member has a closed bottom end with a second aperture spaced from the closed bottom end of the first tubular member and an open top end spaced from the closed top end of the first tubular member. A helical baffle plate is coiled around second tubular member. A third tubular member is concentrically positioned within the second tubular member. The third tubular member has an open bottom end spaced from the closed bottom end of the second tubular member and a top end extending through the first aperture in the first tubular member. A fourth tubular member is concentrically positioned within the third tubular member and extends through the second aperture in the second tubular member. The fourth tubular member has and open bottom end located between the closed bottom end of the second tubular member and the closed bottom end of the tubular member.

EP 1821051: The invention is quick ice-making units (A,B) in a freezing compartment which use a cooking technique based on directing ambient air forcible by a fan (15)- motor (16) mechanism located in a freezing compartment to the compartment of a cooling element (17) such as an evaporator, and cooling this air while passing over the cooling element (17) and re-transferring it into the freezing compartment (1) or the ice chamber (2, 12) from air blowers. These inventive units are described as quick ice-making unit (A) with thermometer cooler and quick ice-making unit (B) with cold air blower inlet. Both units (A, B) have the ability to the used together or separately in a freezing compartment.
Patent Related to the ice Making Unit and Air Flow
OBJECTS OF THE INVENTION
The primary object of the present invention is to propose an improved ice tray for fast ice making in direct cool refrigerator which is simple in construction.
Another object of the present invention is to propose an improved ice tray for fast ice making in direct cool refrigerator which is efficient and effective.
Further object of the present invention is to propose an improved ice tray for fast ice making in direct cool refrigerator which consumes less time to make ice.

Still another object of the present invention is to propose an improved ice tray for fast ice making in direct cool refrigerator which overcomes drawbacks of the prior art.
STATEMENT OF INVENTION
According to this invention there is provided an improved ice tray for fast ice making in direct cool refrigerator comprising of a plurality of spaced apart cavities having protrusion for better conduction and a plurality of holes between said cavities for convention wherein said ice tray is made of stiff resilient plastic material.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein:
Fig. 1 shows: bottom surface of the ice tray.
Fig. 2 shows: performance graph of tray material as compared to known tray material.
DETAIL DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS:
The present invention discloses an improved ice tray as shown in fig. 1 for fast ice making in direct cool refrigerator comprising of a plurality of spaced apart cavities having protrusion for better conduction and a

plurality of holes between said cavities for convention wherein said ice tray is made of stiff resilient plastic material.
The protrusion having preferably dome shape creates a cavity on the bottom surface of said each cavity of the tray which increases the surface area resulting in better conduction. This ensures fast cooling in ice cube.
The holes facilitate air flow from bottom leading to improved convection for fast cooling which makes the ice cube a better solidification point.
Additional convection holes and projection in bottom side of the tray provides uniform conversion of ice cubes as compared to known ice tray.
The stiff resilient plastic material comprising of compound containing polypropylene (PP) and for example 20% of Aluminium. This provision has been made for additional conductivity and to make the tray flexible facilitating removal of ice therefrom. The resilient plastic material shows reduction in ice-making time as compared to the polypropylene material due to enhancement in thermal conductivity of material as shown in fig. 2.
Reference may be made to the following table indicating effect of material change.

It is to be noted that the present invention is susceptible to modifications, adaptations and changes by those skilled in the art. Such variant embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention, which is further set forth under the following claims:-

WE CLAIM
1. An improved ice tray for fast ice making in direct cool refrigerator comprising of a plurality of spaced apart cavities having protrusion for better conduction and a plurality of holes between said cavities for convention wherein said ice tray is made of stiff resilient plastic material.
2. An improved ice tray as claimed in claim 1 wherein said protrusion is having preferably dome shape, which increases the surface area resulting in better conduction.
3. An improved ice tray as claimed in claim 1 or 2 wherein said holes facilitate air flow from bottom leading to improved convection for fast cooling.
4. An improved ice tray as claimed in any of the preceding claims wherein said stiff resilient plastic material comprising of compound containing polypropylene (PP) and for ex. 20% of Aluminium.
5. An improved ice tray for fast ice making in direct cool refrigerator substantially as herein described with reference to the accompanying drawings.