FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2006
Complete Specification
(See Section 10 and Rule 13)
CANOPY FOR DEVICES SUCH AS COMPRESSORS AND
GENERATING SETS
Kirloskar Oil Engines Limited
an Indian Company
of Laxmanrao Kirloskar Road, Khadkl, Pune 411003
Maharashtra, India
The following specification particularly describes the nature of the invention and the manner in which it is to be performed.

FIELD OF INVENTION
This invention relates to enclosures such as canopies for devices such as compressors and generating sets.
BACKGROUND
As society becomes more and more conscious of environmental hazards of temperature and noise as polluting factors, regulations are being implemented for reducing the noise and temperature being generated in devices such as generators, particularly diesel generators, turbines and compressors.
Canopies and enclosures for these devices are well known in the art. Typically these enclosures are made of fibreglass or metal sheet material, but these known canopies and enclosures are not only heavy, but also do not perform adequately in controlling noise and temperature.
SUMMARY OF THE INVENTION
A canopy for enclosing a device is disclosed in accordance with one embodiment of the present invention. The canopy includes a composite laminate, a frame and polyurethane sheet foam. The composite laminate includes a pair of metal film or sheet and a polymeric sheet sandwiched between the pair of metal film or sheet. The composite laminate is subsequently folded and creased at the site. The frame is surrounding the device. The folded and creased composite laminate is fitted to the frame by fastening means. The polyurethane sheet foam is an expanded foam sheet lined by application or coated or fitted on the inside of the canopy formed from the folded and creased composite laminate.

Typically, the composite laminate is formed by a process selected from a group comprising of rolling and pressing.
In one embodiment of the present invention, the polymeric sheet is selected from a group comprising Low-density polyethylene (LDPE), High-density polyethylene (HDPE), Polyvinyl chloride (PVC), Polypropylene (PP), Polycarbonate, nylon, polyester, cellulosic blended polymers, napthalates, deldrin, stanyl, styrenes and a combination thereof.
Particularly, the polymeric sheet has a thickness in the range of 1 mm to 20 mm.
Typically, the metal film or sheet is selected from a group comprising aluminum, iron, galvanized iron, copper, tin and a combination thereof.
Particularly, the metal film or sheet has a thickness in the range of 0.2 mm to 15 mm.
Generally, the thickness of the polyurethane sheet foam is in the range of 0.5 mm to 50 mm.
Generally, suitable cut-outs are provided in the canopy for accessing the enclosed device, wherein the cut-outs are covered with a transparent material selected from a group comprising of transparent polymeric sheet or glass.
DETAILED DESCRIPTION OF THE INVENTION
This invention has for its object the use of a hitherto unknown material and therefore a canopy or enclosure for the aforesaid devices that not only is light in weight, easy to manufacture, particularly to manufacture in situ, but also outperforms known canopies and enclosures.

What is envisaged in accordance with this invention is a canopy or enclosure of a laminate which is a composite of a metal film or sheet sandwiching a polymeric sheet. Typical metals used for the metal sheet or film include aluminium, iron, galvanized iron, copper, tin or a combination of any of the above. Typical polymeric material include, LDPE, HDPE, PVC, PP, Polycarbonate, nylon, polyester, cellulosic blended polymers, napthalates, deldrin, stanyl, styrenes and the like or a combination of one or more of the above. The polymeric material in sheet or woven or non woven form is sandwiched between the metal sheet or film and then is typically formed by rolling or pressing.
The laminate is then folded and creased preferably at the site of the device to be enclosed and placed typically over a frame constructed around the device and fitted to the frame by fastening means such as bolting. Suitable cut outs are formed in the enclosure or canopy to provide for doors or windows for accessing the enclosed device.
The thickness of the metal sheet or film can typically range from 0.2 mm to 15 mm and the thickness of the polymeric layer can typically range from 1 mm to 20 mm.
In the formed enclosure which is made by bending and creasing, polyurethane foam is lined on the inside of the formed enclosure by application or coating or fitting an expanded foam sheet. The typical thickness of the PU sheet can range between 0.5 mm to 50 mm.

The foam sheets are not provided in the cut out areas where suitable transparent material, either in the form of a transparent polymeric sheet or glass, may be provided to view the device in the enclosure.
In use it has been found during experimentation that the enclosure in accordance with this invention significantly reduces the generated noise and temperature.
While considerable emphasis has been placed herein on the product, it will be appreciated that further alterations can be done and that many modifications can be done in the preferred embodiments without departing from the principles of the present invention.
These and other changes in the preferred product in accordance with the present invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the present invention and not as a limitation thereof.

WE CLAIM:
1. A canopy for enclosing a device, said canopy comprising:
> a composite laminate having a pair of metal film or sheet and a polymeric sheet sandwiched between said metal film or sheets, said composite laminate subsequently folded and creased at the site,
> a frame surrounding the device, said folded and creasedcomposite laminate being fitted to said frame by fastening means.
> A polyurethane sheet foam, particularly an expanded foam sheet lined by application or coated or fitted_on the inside of said canopy formed from said folded and creased composite laminate,

2. The canopy as claimed in claim 1, wherein said composite laminate is formed by the process selected from the group comprising of rolling and pressing.
3. The canopy as claimed in claim 1, wherein said polymeric sheet is selected from the group comprising Low-density polyethylene (LDPE), High-density polyethylene (HDPE). Polyvinyl chloride (PVC), Polypropylene (PP), Polycarbonate, nylon, polyester, cellulosic blended polymers, napthalates, deldrin, stanyl, styrenes and a combination thereof.
4. The canopy as claimed in claim 1, wherein said polymeric sheet has a thickness in the range of 1 mm to 20 mm.

5. The canopy as claimed in claim 1, wherein said metal film or sheet is selected from the group comprising aluminum, iron, galvanized iron, copper, tin and a combination thereof.
6. The canopy as claimed in claim 1, wherein said metal film or sheet has a thickness in the range of 0.2 mm to 15 mm.
7. The canopy as claimed in claim 1, wherein the thickness of said polyurethane sheet foam is in the range of 0.5 mm to 50 mm.
8. The canopy as claimed in claim 1, wherein said canopy is provided with suitable cut-outs for accessing said enclosed device, said cut-outs being covered with a transparent material selected from the group comprising of transparent polymeric sheet or glass.