FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
AND
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
“HEIGHT ADJUSTABLE AIR COOLER TANK ASSEMBLY AND METHODS OF OPERATING THE SAME”
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 generally relates to the field of air cooling devices. In particular, the present invention relates to an assembly for adjustable height of an air cooler tank.
BACKGROUND OF THE INVENTION
This section is intended to provide information relating to the field of disclosure and thus, any approach or functionality described herein should not be assumed to qualify as prior art merely by its inclusion in this section.
Air coolers generally include a blower assembly including a set of blades disposed within an enclosure. The set of blades rotate to generate an air flow in a direction coaxial with the fan blades. Water cooled air coolers further include a water tank disposed within the enclosure or outside the enclosure. Tubes or pipes carry water from the water tank and through the enclosure. Water from the tubes (or pipes) fall on cooling pads present within the enclosure, and the water exchanges heat with air passing through the cooling pads, thereby cooling the air. The cooled air is pushed out by the set of blades to generate a cool draft of air.
Conventionally, air coolers are assembled on a stand or a platform having a predefined height. Further, the height is not adjustable. Such an assembly provides limitations when the height needs to be changed. For example, if a user were to sit on a floor relative to a user sitting on a chair, the height at which air flow from the air cooler is required to change drastically. However, the fixed nature of the platform or stand on which the air cooler is placed may restrict degree by which the height of the air cooler is changed.
Furthermore, during periods that the air cooler is not used, the air cooler may have to be stored or stowed as it is. In other words, the air cooler may occupy a large space, thus preventing effective usage of storage space.
There is, therefore, a requirement in the art, for a means to allow height of an air cooler to be adjusted according to user preference. Further, it is preferable that the means for height adjustment of the air cooler allow the air cooler to attain

a minimum form factor in order for the air cooler to be stored or stowed with minimum space requirement.
SUMMARY OF THE INVENTION
This section is intended to introduce one or more aspects and/or embodiments of the present disclosure in a simplified form and is not intended to identify any key advantages or features of the present disclosure.
In an aspect, the present invention provides a height adjustable air cooler tank assembly comprising a water tank comprising a plurality of cavities to accommodate at least a part of a plurality of legs; the plurality of legs, wherein each leg comprises at least a rib and engagement pockets, and the plurality of legs concurrently slide into at least a cavity in the water tank; at least a slider located horizontally at the bottom of the water tank, wherein at least the slider is adapted to glide vertically along the length of at least one rib of the plurality of legs; and at least a lever configured to disengage at least the slider from the plurality of legs based at least on an internal sliding wedge mechanism, wherein the engagement of at least the slider with the engagement pockets fixes the height of the air cooler.
In an aspect, the water tank further comprises at least a spring adapted to apply a constant force on at least a part of the slider to maintain engagement between the slider and the leg.
In an aspect, the slider is adapted to engage at least the leg with at least the spring.
In an aspect, the height adjustable air cooler tank assembly comprises a plurality of castor wheels for mobility.
In an aspect, the height adjustable air cooler tank assembly comprises a bottom frame.
In an aspect, the lever is adapted to disengage at least the slider from at least the engagement pocket of at least the leg upon application of an external force.
In an aspect, the present invention provides a method of lowering the height of an air cooler comprising a height adjustable air cooler tank assembly comprising

a water tank comprising a plurality of cavities to accommodate at least a part of a plurality of legs; the plurality of legs, wherein each leg comprises at least a rib and engagement pockets, and the plurality of legs concurrently slide into at least a cavity in the water tank; at least a slider located horizontally at the bottom of the water tank, wherein at least the slider is adapted to glide vertically along the length of at least one rib of the plurality of legs; and at least a lever configured to disengage at least the slider from the plurality of legs based at least on an internal sliding wedge mechanism, wherein the engagement of at least the slider with the engagement pockets fixes the height of the air cooler. The method comprises exerting an external force on the lever to change the position of the lever from a default first position to a transient second position, wherein the transient second position is maintained for the duration of external force applied on the lever, wherein in the default first position, the slider is engaged with at least the engagement pocket of the leg, and in the transient second position, the slider is configured to pull back and glide vertically along the length of the at least one rib of the leg; allowing the water tank to move downwards under the influence of gravity to desired lower position; and removing the external force on the lever to allow it to return to the default first position, wherein upon removal of the external force, the slider is engaged with at least the engagement pocket of the leg at a lower height.
In an aspect, the present invention provides a method of increasing the height of an air cooler comprising a height adjustable air cooler tank assembly comprising a water tank comprising a plurality of cavities to accommodate at least a part of a plurality of legs; the plurality of legs, wherein each leg comprises at least a rib and engagement pockets, and the plurality of legs concurrently slide into at least a cavity in the water tank; at least a slider located horizontally at the bottom of the water tank, wherein at least the slider is adapted to glide vertically along the length of at least one rib of the plurality of legs; and at least a lever configured to disengage at least the slider from the plurality of legs based at least on an internal sliding wedge mechanism, wherein the engagement of at least the slider with the engagement pockets fixes the height of the air cooler. The method comprises holding the bottom frame; lifting the water tank to desired higher position, wherein

during lifting of the water tank, the spring exerts a constant force on the slider such as to glide the slider vertically along the length of at least one rib of the plurality of legs; and leaving the water tank at the desired higher position when the slider engages with at least the engagement pocket in at least the leg.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The present disclosure, both as to its organization and manner of operation, together with further objects and advantages, may best be understood by reference to the description, taken in connection with the accompanying drawings. These and other details of the present invention will be described in connection with the accompanying drawings, which are furnished only by way of illustration and not in limitation of the scope of the present disclosure.
FIG. 1 illustrates a schematic perspective view of an air cooler, according to an embodiment of the present invention;
FIG. 2A illustrates a schematic perspective view of a tank assembly, of the air cooler of FIG. 1, according to an embodiment of the present invention;
FIG. 2B illustrate a schematic exploded view of the tank assembly of FIG. 2A, according to an embodiment of the present invention;
FIG. 3 illustrates a schematic flow diagram for a method for lowering the height of the air cooler of FIG. 1, according to an embodiment of the present invention; and
FIG. 4 illustrates a schematic flow diagram for a method for increasing the height of the air cooler of FIG. 1, according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
In the following description, for the purposes of explanation, various specific details are set forth in order to provide a thorough understanding of one or more embodiments of the present disclosure. It will be apparent, however, that embodiments of the present disclosure may be practiced without these specific

details. Several features described hereafter may each be used independently of one another or in any combination with other features. An individual feature may not address any of the problems discussed above or may address only some of the problems discussed above. Some of the problems discussed above may not be fully addressed by any of the features described herein. Example embodiments of the present disclosure are described below, as illustrated in various drawings, in which same reference numerals refer to the same parts throughout the different drawings. The present invention provides a height adjustable air cooler tank assembly. The tank assembly comprises a water tank comprising a plurality of cavities to accommodate at least a part of a plurality of legs. In an embodiment, the tank assembly includes one or more cavities for a corresponding one or more legs. In a preferred embodiment, the tank assembly includes four cavities adapted to accommodate four legs, where the cavities are disposed at corners of the water tank. Each leg includes at least a rib and engagement pockets. In an embodiment, each leg includes a plurality of engagement pockets disposed along a length of the leg. A number of engagement pockets corresponds to a number of different height positions that the air cooler can be adjusted in. In an embodiment, each leg includes an engagement pocket at a bottom of the leg. The plurality of legs concurrently slides into at least a cavity in the water tank. The tank assembly further includes at least a slider disposed horizontally at the bottom of the water tank and adapted to glide vertically along the length of at least one rib of the plurality of legs. In an embodiment, the tank assembly includes two sliders disposed along a wall of the water tank. In a preferred embodiment, the tank assembly includes two sets of two sliders disposed on opposing walls of the water tank. The tank assembly further includes at least a lever configured to disengage at least the slider from the plurality of legs based at least on an internal sliding wedge mechanism. The engagement of at least the slider with the engagement pockets fixes the height of the air cooler. In an embodiment, the tank assembly includes a slider with an internal sliding wedge mechanism for a set of two sliders. In a preferred embodiment, the tank assembly includes a slider for each of the set of two sliders disposed on the opposing walls of the water tank.

In an embodiment, the water tank further includes at least a spring adapted to apply a constant force on at least a part of the slider to maintain engagement between the slider and the leg. In another embodiment, the tank assembly includes two springs for the two sliders disposed along a wall of the water tank. In a preferred embodiment, the tank assembly includes two sets of two springs for the sliders located on opposing walls.
In an embodiment, the slider is adapted to engage at least the leg with at least the spring. Specifically, the slider is adapted to engage with an engagement pocket of the leg with the spring adding a force to ensure that the engagement between the slider and the engagement pocket is maintained.
In an embodiment, the height adjustable air cooler tank assembly includes a plurality of castor wheels for mobility. Specifically, the tank assembly includes a castor wheel for each of the plurality of legs and coupled thereof.
In an embodiment, the tank assembly further includes a bottom frame. The bottom frame is coupled to at least a leg of the tank assembly. In a preferred embodiment, the bottom frame is coupled to all the legs of the tank assembly.
The present invention further provides a method of lowering the height of the air cooler. The method includes exerting an external force on the lever to change the position of the lever from a default first position to a transient second position. In the default first position, the slider is engaged with at least the engagement pocket of the leg. In the transient second position, the slider is configured to pull back and glide vertically along the length of the at least one rib of the leg. The method further includes allowing the water tank to move downwards under the influence of gravity to desired lower position. The method further includes removing the external force on the lever to allow it to return to the default first position. Upon removal of the external force, the slider is engaged with at least the engagement pocket of the leg at a lower height.
The present invention further provides a method of increasing the height of the air cooler. The method includes holding the bottom frame. The method further includes lifting the water tank to desired higher position. During lifting of the water

tank, the spring exerts a constant force on the slider such as to glide the slider vertically along the length of at least one rib of the plurality of legs. the method further includes leaving the water tank at the desired higher position when the slider engages with at least the engagement pocket in at least the leg.
FIG. 1 illustrates a schematic perspective view of an air cooler 200, according to an embodiment of the present invention. The air cooler 200 includes a blower assembly 202, and a tank assembly 100. The blower assembly 202 is arranged above, and removably coupled to the tank assembly 100. The blower assembly 202 includes an enclosure 204, and a set of blades 206 disposed within the enclosure 204. The set of blades 206 are axial flow blades and are adapted to be rotated by a motor (not shown in figure). The enclosure 204 further comprises an aperture 208 on a wall of the enclosure 204. The aperture 208 is positioned such that the aperture is along a direction of flow of air from the set of blades 206, thereby enabling the set of blades 206 to drive an airflow through and out of the enclosure 204. The enclosure 204 further includes one or more tubes (not shown in figure) adapted to circulate a cooling fluid therethrough. In an embodiment, the cooling fluid is water. The cooling fluid falls on cooling pads (not shown in figure) disposed within the enclosure 204. The cooing pads facilitate exchange of heat between the cooling fluid and air passing through the cooling pads to cool the air within the enclosure 204. The cooled air is then driven out of the enclosure 204 by the set of blades 206, and through the aperture 208, thereby causing a cooling draft to flow from the air cooler 200.
FIGs. 2A and 2B illustrate schematic perspective and exploded views, respectively, of the tank assembly 100, according to an embodiment of the present invention. The tank assembly 100 includes a water tank 102. The water tank 102 is adapted to store the cooling fluid. Referring to FIGs. 1 to 2B, the tubes are fluidically coupled to the water tank 102 and are adapted to allow the cooling fluid in the water tank to flow therethrough. In an embodiment, a pump (not shown in figure) may be provided to pump the cooling fluid through the tubes.
The water tank 102 includes a plurality of cavities 103. Specifically, the cavities 103 extend along walls of the water tank 102 along a vertical direction. In

an embodiment, the cavities 103 are slots that are each adapted to receive a leg 104 of the tank assembly 100 therethrough. Accordingly, the tank assembly 100 includes a plurality of legs 104 adapted to be fitted with the corresponding cavities 103. The legs 104, upon fitment, extend vertically along the downward direction, and are adapted to rest on a horizontal surface (e.g., the floor) to provide support to the air cooler 200. The legs 104 are further provided with one of wheels and bushes on a surface that comes in contact with the horizontal surface. Bushes may limit abrasion between the horizontal surface and the legs 104. The wheels may allow movement of the air cooler 200 by allowing the legs 104 to move along the horizontal surface. In a preferred embodiment, the legs 104 are provided with castor wheels 114.
The legs 104 are adapted to slide through the corresponding cavities 103, such that a length (or height) of a portion of the legs 104 extending from the water tank 102 varies based on a length of the legs 104 that are within the cavities 103. Each leg 104 includes at least one rib disposed along its length. The rib may provide a structural rigidity to the leg 104. Each leg 104 further includes at least one engagement pocket disposed along its length. The engagement pocket may be arranged at a predefined location along the length of the leg 104. In an embodiment, each leg 104 includes two or more engagement pockets disposed at predefined positions along the length of the leg 104.
The tank assembly 100 further includes at least a slider 106 disposed horizontally at a bottom of the water tank 102. The slider 106 is arranged such that at least an end of the slider 106 is in contact with a leg 106, and the at least end of the slider 106 is adapted to glide over the length of the leg 104 as the leg 104 moves into or out of the cavity 103. Further, the at least end of the slider 106 is adapted to selectively engage with the engagement pockets of the leg 104. In the illustrated embodiment, a wall of the water tank 102 includes two sliders 106 disposed adjacent each other, and horizontally at the bottom of the water tank 102. The respective ends of the sliders 106 are adapted to be in contact with adjacent legs 104 of the tank assembly 100.
The tank assembly 100 further includes at least a lever 108. The lever 108 is kinematically coupled to the sliders 106. The lever 108 has an internal sliding

wedge mechanism and is slidably arranged in a slot and is adapted to move between lock and unlock positions. In the lock position, the lever 108 is so arranged that it restricts movement of the sliders 106 away from the leg 104, thereby maintaining an engagement between the sliders 106 and the legs 104, particularly between the sliders 106 and the engagement pockets of the legs 104. In the unlock position, the lever 108 is so arranged that it allows movement of the sliders 106 to move away from the leg 104, thereby causing a disengagement of the sliders 106 with the legs 104, particularly between the sliders 106 and the engagement pockets of the legs 104.
Further, the tank assembly 100 includes springs 110 adapted to apply a constant force on at least a part of the slider 106 to maintain a contact or engagement between the slider 106 and the leg 104 when the lever 108 is in the lock position. In the unlock position of the lever 108, the motion of the lever 108 is adapted to compress the springs 110 such that they pull the sliders 106 away from the legs 104 causing the disengagement between the sliders 106 and the legs 104.
In an embodiment, the assembly including the sliders 106, the springs 110, and the levers 108 is arranged on one or more walls of the water tank 102. In a preferred embodiment, the assembly including the sliders 106, the springs 110, and the levers 108 is arranged on opposing walls of the water tank 102.
The tank assembly 100 further includes a bottom frame 112 disposed towards a bottom of and coupled with the legs 104. The bottom frame 112 is adapted to provide stability and support to the orientation and position of the legs 104 relative to each other.
When the lever 108 is in the unlock position, the legs 104 are free to move into or out of the cavities 103. Moving of the legs 104 into or out of the cavities 103 allows the height of the portion of the legs extending from out of the cavities 103 and up to the horizontal surface to be varied. In other words, the height of the water tank 102 from the horizontal surface (e.g., the floor) can be varied, resulting in varying of the height of the air cooler 200 from the floor. In an embodiment, a manual force may be applied to move the lever 108 between the lock and unlock positions.

FIG. 3 illustrates a schematic flow diagram for a method 300 for lowering the height of the air cooler 200, according to an embodiment of the present invention. At step 302, the method 300 includes exerting an external force on the lever 108 to change the position of the lever 108 from a default first position to a transient second position. The first position corresponds to the lock position and the second position corresponds to the unlock position. The transient second position is maintained for the duration of external force applied on the lever 108. In the default first position, the slider 106 is engaged with at least the engagement pocket of the leg 104, and in the transient second position, the slider 106 is configured to pull back and disengage from at least the engagement pocket. At step 304, the method 300 further includes allowing the water tank 102 to move downwards under the influence of gravity to desired lower position. At step 306, the method 300 further includes removing the external force on the lever 108 to allow it to return to the default first position. Upon removal of the external force, the slider 106 is engaged with at least the engagement pocket of the leg 104 at a lower height.
FIG. 4 illustrates a schematic flow diagram for a method 400 for increasing the height of the air cooler 200, according to an embodiment of the present invention. At step 402, the method 400 includes holding the bottom frame 112. At step 404, the method 400 includes lifting the water tank 102 to desired higher position. During lifting of the water tank 102, the spring 110 exerts a constant force on the slider 106 such as to glide the slider 106 vertically along the length of at least one rib of the plurality of legs 104. At step 406, the method further includes leaving the water tank 102 at the desired higher position when the slider 106 engages with at least the engagement pocket in at least the leg 104.
Referring to FIGs. 3 and 4, the height of the air cooler 200 can be varied as per requirement by using the lever 108 and slider 106 mechanism. In an embodiment, the water tank 102 may be allowed to drop all the way till the bottom frame 112. In such a position, the air cooler 200 may be stored or stowed away when not in use. As a result, during storage, the form factor of the air cooler 200 is minimised, thus occupying less space. Further, as a result of attaining a minimum

form factor, the air cooler 200 may be packaged in smaller containers or cartons, which results in lower space occupancy and easier logistics.
While the preferred embodiments of the present disclosure have been described hereinabove, it may be appreciated that various changes, adaptations, and modifications may be made therein without departing from the spirit of the disclosure and the scope of the appended claims. It will be obvious to a person skilled in the art that the present disclosure may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments may to be considered in all respects only as illustrative and not restrictive.
LIST OF REFERENCE NUMERALS
100 Tank Assembly
102 Water Tank
103 Cavities
104 Legs
106 Slider
108 Lever
110 Spring
112 Bottom Frame
114 Castor Wheels
200 Air Cooler
202 Blower Assembly
204 Enclosure
206 Set of Blades
208 Aperture
300 Method
302 Step
304 Step

306 Step 400 Method 402, 404, 406 Step

I/We Claim:
1. A height adjustable air cooler tank assembly (100), comprising:
- a water tank (102) comprising a plurality of cavities (103) to accommodate at least a part of a plurality of legs (104);
- a plurality of legs (104), wherein each leg (104) comprises at least a rib and engagement pockets, and the plurality of legs (104) concurrently slide into at least a cavity (103) in the water tank (102);
- at least a slider (106) disposed horizontally at the bottom of the water tank (102), wherein at least the slider (106) is adapted to glide vertically along the length of at least one rib of the plurality of legs (104); and
- at least a lever (108) configured to disengage at least the slider (106) from the plurality of legs (104) based at least on an internal sliding wedge mechanism,
wherein the engagement of at least the slider (106) with the engagement pockets fixes the height of the air cooler (100).
2. The height adjustable air cooler tank assembly (100) as claimed in claim 1, wherein the water tank (102) further comprises at least a spring (110) adapted to apply a constant force on at least a part of the slider (106) to maintain engagement between the slider (106) and the leg (104).
3. The height adjustable air cooler tank assembly (100) as claimed in claim 2, wherein the slider (106) is adapted to engage at least the leg (104) with at least the spring (110).
4. The height adjustable air cooler tank assembly (100) as claimed in claim 1, comprising a plurality of castor wheels (114) for mobility.

5. The height adjustable air cooler tank assembly (100) as claimed in claim 1, comprising a bottom frame (112).
6. The height adjustable air cooler tank assembly (100) as claimed in claim 1, wherein the lever (108) is adapted to disengage at least the slider (106) from at least the engagement pocket of at least the leg (104) upon application of an external force.
7. A method (300) of lowering the height of an air cooler (200) comprising the height adjustable air cooler tank assembly (100) as claimed in claim 1, said method (300) comprising:
a. exerting an external force on the lever (108) to change the position
of the lever (108) from a default first position to a transient second
position, wherein the transient second position is maintained for the
duration of external force applied on the lever (108), wherein in the
default first position, the slider (106) is engaged with at least the
engagement pocket of the leg (104), and in the transient second
position, the slider (106) is configured to pull back and disengage
from at least the engagement pocket;
b. allowing the water tank (102) to move downwards under the
influence of gravity to desired lower position; and
c. removing the external force on the lever (108) to allow it to return
to the default first position, wherein upon removal of the external
force, the slider (106) is engaged with at least the engagement pocket
of the leg (104) at a lower height.
8. A method (400) of increasing the height of an air cooler (200) comprising
the height adjustable air cooler tank assembly (100) as claimed in claim 1,
said method (400) comprising:
a. holding the bottom frame (112);

b. lifting the water tank (102) to desired higher position, wherein
during lifting of the water tank (102), the spring (110) exerts a
constant force on the slider (106) such as to glide the slider (106)
vertically along the length of at least one rib of the plurality of
legs (104); and
c. leaving the water tank (102) at the desired higher position when
the slider (106) engages with at least the engagement pocket in
at least the leg (104).