Claims:We Claim:

1. A thermoplastic non-lubricated piston consisting of:

a polymer blend of mainly Poly benzimidazole (PBI) and Polyaryl Ether Ketone (PAEK), characterized by, the Poly benzimidazole is Poly (2, 5- benzimidazole) (ABPBI).

2. The thermoplastic non-lubricated piston as claimed in claim 1, wherein the polymeric blend includes carbon fiber which is suitable for incorporation into the blend of Polyaryl ether Ketone and Poly (2, 5-benzimidazole) to further improve the overall mechanical properties of the polymer composition.

Dated this on 6th March, 2020.

, Description:FORM 2
THE PATENT ACT 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. TITLE OF THE INVENTION: A THERMOPLASTIC NON-LUBRICATED PISTON

2. APPLICANT:
1.
(a) NAME : Mr. Praful Parekh
(b) NATIONALITY : Indian
(c) ADDRESS :19, Talak Nagar Society,
Opp.- Unnati High School,
Near Mahalaxmi Char Rasta,
Paldi, Ahmedabad- 380007
Gujarat, India.

2.
(a) NAME :INDO-AIR COMPRESSORS PVT LTD
(b) NATIONALITY :Indian
(c) ADDRESS :Plot No:550, Kathwada GIDC, Kathwada, Ahmedabad

3. PREMABLE TO THE DESCRIPTION
PROVISIONAL

The following specification describes the invention. þ COMPLETE

The following specification particularly describes the invention and the manner in which it is to be performed.

Field of Invention:

The present invention relates to a piston and more particularly it relates to a thermoplastic non-lubricated air compressor and gas compressor non-lubricated piston with P.T.F.E. piston rings.

Background of the invention:

Air compressor and gas compressor non-lubricated pistons with metal blend or carbon blend on commercial scale with P.T.F.E. piston rings are generally known in the art. The conventional air or gas compressor non-lubricated piston uses metal or carbon as input raw material.

The conventional compressor non lubricated piston in which metal is uses as raw material. These pistons have piston P.T.F.E. piston rings in-between. In case of wearing of piston rings the metal piston will come in contact with metal of cylinder due to this sparking is possible in the air compressor and or piston will jam in the cylinder and damaging it. Due to this the fire may possible in the gas compressor and may damage cylinders in air and gas compressor. In other case, the conventional non-lubricated piston also uses carbon as row material. But due to the use of the carbon blend the breakage of the piston is possible at the time of the installation and the costs of the conventional carbon pistons are very high and the impact resistance is low.
As of now, there are possible to use the thermoplastic non- lubricated material as row material in the manufacturing of the air compressor piston. In case of wearing of P.T.F.E. piston ring the piston will not damage the cylinder and will work for short time without damaging the piston.

The prior art document EP1612395A1 is describing about an internal engine piston suitable for automobile engines, particularly for diesel engines, etc., and its production method. According to the invention, An integrally cast steel piston for internal engines, the cast steel having (a) a composition comprising 0.8% or less of C, 3% or less of Si, 3% or less of Mn, 0.2% or less of S, 3% or less of Ni, 6% or less of Cr, 6% or less of Cu, and 0.01-3% of Nb, the balance being substantially Fe and inevitable impurities, or (b) a composition comprising 0.1-0.8% of C, 3% or less of Si, 3% or less of Mn, 0.2% or less of S, 10% or less of Ni, 30% or less of Cr, 6% or less of Cu, and 0.05-8% of Nb, the balance being substantially Fe and inevitable impurities, by mass.

Another prior art document US 2006/0005700A1 describing about the one-piece Steel piston that is made from a piston blank that includes a portion that configured and designed to be displaced to form a cooling gallery and ring belt. The piston blank can be formed by a casting or forging process. The portion that is designed and configured to be displaced is a flange that extends radially at the top of the piston blank. The flange is bent downward So that a peripheral edge of the flange contacts a top portion of the piston skirt. The peripheral edge of the flange and the top portion of the skirt can be welded together or provided with inter-engaging Structures.

Moreover, the further prior art document US 2013/0180493A1 describing about a semi finished product blank, suitable for the production of a steel piston (1) for internal combustion engines having cylinder crankcases made of light metal alloys. Such a steel piston (1) has at least one upper piston part (4) which has a combustion recess (2) and an annular wall (3), and a lower piston part (4') which has a piston skirt (5) and a connecting rod bearing (6). The semi finished product blank is made of austenitic steel, that is stabilized with Ni, Mn and N and that has a thermal expansion coefficient in a range of 16 to 21x10-6 K-1. Also disclosed is a steel piston, which at least has a piston skirt (5) made of an austenitic steel that is stabilized with Ni, Mn, N. The piston skirt (5) has a thermal expansion coefficient in a range of 16 to 21x10-6 K-1.

Another one prior art document US 8,807,109 B2 is describing about the piston and method of construction. The piston includes a top part fixed to a bottom part. The top part has an uppermost surface with annular inner and outer upper joining Surfaces depending therefrom. The bottom part has a pair of pin bosses with pin bores aligned with one another along a pin bore axis; a pair of upwardly extending annular inner and outer lower joining Surfaces and a combustion bowl wall. Inner and outer weld joints fix the inner and outer upper and lower joining Surfaces to one another. An annular cooling gallery is formed laterally between the upper and lower joining Surfaces. The inner weld joint joining the top part to the bottom part is located within the combustion bowl wall and configured to minimize the compression height of the piston.

However, abovementioned conventional compressor pistons are made from the steel or other metals. As of if the one portion of the steel comes in the contact with another there is possibility of the sparking and damaging of the cylinder. Due to this the piston ring not able to melt and the fire may tack place. Also the mechanical and the wear resistive properties of the conventional pistons are low. Further, all of the abovementioned conventional pistons are for internal combustion engines and are made of various metal and metal alloys. These conventional pistons are being used in power generating system while the piston of the present invention used in power using system for compressing air or gas. The piston of the present invention is using 100 % thermoplastic material. The ribs in the piston of the present invention is inside the piston and parallel to the length of the piston for reducing warping at the open end of the piston. The weight of the thermoplastic piston of the present invention is very low comparing metal piston. Thus, due to the light weight certain amount of energy saves during the operation.

Hence, it is desperately needed to introduce a thermoplastic non-lubricated piston for air compressor and gas compressor.

Object of Invention:

The main object of present invention is to provide thermoplastic non-lubricated piston that having ameliorated structural rigidity while at the same time a suitable production material therefore.

Further object of present invention is to provide thermoplastic non-lubricated piston to provide articles possessing excellent mechanical strength and wear resistance properties derived from a material composition.

Further more object of the invention is that is to provide an air compressor piston having economical significance compared to conventional piston.

Summary of Invention:

The present invention relates to thermoplastic non-lubricated air compressor piston. According to present invention, said air compressor piston comprises thermoplastic non-lubricated material which has excellent mechanical strength and wear resistance properties. The material composition of the thermoplastic non-lubricated material is polymeric blend of the Polyaryletherketone (P.A.E.K.), Polybenzimidazole (P.B.I.) and carbon fiber. The technical advantage of the polymer composition which comprising a blend of Polyaryletherketone (PAEK) and Polybenzimidazole (P.B.I.) polymers that demonstrates excellent mechanical and wear resistance properties as compared to commercial blends.

The air compressor piston of the present invention provides multifold benefits to industries and end users which will be apparent from the following description.

Detailed description of the Invention:

The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

It is to be also understood that the term "comprises" and grammatical equivalents thereof are used herein to mean that other components, ingredients, steps, etc. are optionally present. For example, an article "comprising" (or "which comprises") components A, B, and C can consist of (i.e., contain only) components A, B, and C, or can contain not only components A, B, and C but also contain one or more other components.

The present invention is directed to thermoplastic non-lubricated pistons for air compressor and gas compressor. The thermoplastic non-lubricated piston of the present invention is formed from thermoplastic non- lubricated material. The thermoplastic non- lubricated material include the polymeric blend of mainly the Polyaryletherketone (P.A.E.K.), Polybenzimidazole (P.B.I.).

The Polyaryl ether Ketone (PAEK) is highly temperature-resistant thermoplastic resins and also possesses high resistance to organic and inorganic chemicals and high mechanical strength.

The polybenzimidazole polymer used for the purpose of the present disclosure is preferably Poly (2, 5-benzimidazole) (ABPBI).

The thermoplastic non-lubricated composition of the present invention further comprises at least one additional component which are suitable for incorporation into the blend of Polyaryl ether Ketone and Poly (2, 5-benzimidazole) to further improve the overall mechanical properties of the polymer composition. The additional components may comprise carbon fibers.

The polymeric composition of the present invention consist a polymer blend of Polyaryl Ether Ketone (PAEK) and Poly (2, 5-benzimidazole) is apparently advantageous over existing metal or carbon blend as follows:

• Providing a polymer composition comprising a blend of Polyaryl Ether Ketone (PAEK) and Poly (2, 5-benzimidazole) (ABPBI) polymers that demonstrates excellent mechanical and wear resistance properties as compared to commercial blends, and
• Providing articles/shaped articles with excellent mechanical and wear resistance properties made from a polymer composition comprising a polymer blend of Polyaryl Ether Ketone (PAEK) and Poly(2,5-benzimidazole) (ABPBI) polymers.

The invention has been explained in relation to specific composition. It is inferred that the foregoing description is only illustrative of the present invention and it is not intended that the invention be limited or restrictive thereto. Many other specific composition of the present invention will be apparent to one skilled in the art from the foregoing disclosure. All substitution, alterations and modification of the present invention which come within the scope of the following claims are to which the present invention is readily susceptible without departing from the spirit of the invention. The scope of the invention should therefore be determined not with reference to the above description but should be determined with reference to appended claims along with full scope of equivalents to which such claims are entitled.