Title of Invention

AN IMPROVED AIR COMPRESSOR

Abstract An improved air compressor consisting of a cylinder with cylinder head provided with a ball type non return air inlet valve and a piston provided with a pluraiity of air passages, a cavity at one end and a threaded central hole, a floating type non return air inlet valve made up of a non metallic carbon filled Poly Tetra Fluoro Ethylene with central hole accommodated in the said cavity of the piston, a washer having a pluraiity of air passages, a non metallic compression ring fitted at one end of the piston at its outer periphery with the help of the said washer ,a screw passing through the said washer and non return air inlet valve engaging into the threaded hole in the piston, a connecting rod attached with a moulded Nylon ring having housing enclosing therein a bearing at one end and external threads at other end for screwing the said connecting rod into the threaded hole in the piston, the said connecting rod being mounted over an eccentric pivot pin fitted to a flywheel and a power transmission system for rotating the said fly wheel. 8
Full Text
FORM - 2

THE PATENTS ACT, 1970
COMPLETE SPECIFICATION: SECTION - 10
"AN IMPROVED AIR COMPRESSOR"
SAVALIA RAVJ1BHAI MADHABHAI
C/o. Savalia Research Centre,
Opp. 137, Last Bus Stop,
Near Kamdar Kalyan Kendra,
New Bapunagar, Ahmedabad - 380 024.
Gujarat State, India.
The followïng specification particularly describes the nature of
this invention and the marmer in which it is to be performed: -


This invention relates to "AN IMPROVED AIR COMPRESSOR".
More particularly this invention relates to an improved oil-less
air compressor provided with a novel piston and connecting
rod assembiy, which results into a maintainable, efficiënt, and
less noisy air compressor.
Currently available oil-less air compressor comprises a
cylinder head provided with a pair of finger strip type non
return valves, one working as air inlet and other working as air
outlet valve, a piston hoving a number of two ended piston
rings which are commonly made of self lubricated soft
materials working as compression rings. A forged rigid metallic
rod connected at one end with the piston, with the help of
gudgeon pin and the other end being connected to the
flywheel with the help of a bearing. There are many drawbacks
of the existing air compressor such as:
1. The finger strip type valves used for air inlet and air outlet
are exposé d to the environment which accumulates dust
on them resulting air leakage. Thus the existing system
requires high maintenance.
2. As the connecting rod used is made up of forged metal,
any misalignment results into wear and tear of piston,
piston rings and bearings. This enforces to replace piston
and piston rings frequently, thus the maintenance is
costly.
3. Piston and connecting rod are connected with the help
of gudgeon pin. A smal! amount of misalignment results
into noisy functioning.
So with the motto of obviating all the above-mentioned
drawbacks of existing oil-less air compressor, inventor has
developed "AN IMPROVED AIR COMPRESSOR".
The further object of this invention is to provide "AN IMPROVED
AIR COMPRESSOR" having a novel piston and a connecting
rod, which is partly flexible as molded ring of nylon, is provided
at one end of the rod. This cancels the effects generated due
to misalignment of the assembiy.
The further object of this invention is to provide AN IMPROVED
AIR COMPRESSOR wherein the connecting rod is direcfly
2

connected to the piston without using the gudgeon pin. This
eliminates noisy functioning of the assembly.
The further object of this invention is to provide AN IMPROVED
AIR COMPRESSOR wherein a single expandable ring made up of
-self lubricated carbon Poly Tetra Fluoro Ethylene, which is
further referred to as PTFE, with spherical outer surface at the
one end of the piston to provide leak proof contact and
preventing the piston from direct rubbing to the cylinder.
The further object of this invention is to provide AN IMPROVED
AIR COMPRESSOR wherein finger strip valves are replaced by a
ball type air outlet valve provided in cylinder head and a
washer shaped floating type non return valve provided in the
piston itself to prevent dust accumutation and hence the
system requires less maintenance.
The further object of this invention is to provide AN IMPROVED
AIR COMPRESSOR wherein the piston is modified to have a
plurality of air passages and to accommodate a non-return
valve providing unidirecfional airflow. Provision of the valves
inside the piston itself provides cooling to the piston and
compression rings, allowing the air compressor to run for a
longer duration.
The invention will now be described in more details with
reference to the accompanying drawings wherein:
Fig.l and 2 show the cross sectional elevation of the existing air
compressor, showing the piston motion ïn upward and
downward direction respectively.
Fig 3 and 4 shows the cross sectional elevation of the improved
air compressor, according to an embodiment of this invention.
Fig 5 shows the cross sectiona! side view of the improved air
compressor.
Fig 6 shows the cross section of the compression ring of the
improved air compressor.
3

Fig 7 shows the plan of the washer of the improved air
compressor.
Fig 8 shows the plan of the piston of. the improved air
compressor.
Fig 9 and 10 shows the cross sectional elevation and plan of
the floating type non-return air inlet valve of the improved air
compressor.
Referring to Fig l and 2, the existing oil less air compressor
mainiy comprises of a flywheel (1] having power transmission
system for rotating the same. A forged rigid connecting rod (2)
is fitted to the flywheel with the help of bearing (3) mounted on
an eccentric pivot pin. A piston(4) connected to the
connecting rod (2) with the help of gudgeon pin (5), two or
move two ended piston nngs (6) are provided in the groeves
made in the periphery of the piston. The piston rings are made
u p of non-metallic self lubricated soft material and are
provided with a step slot at the joint. A pair of finger strip type
valves (7 and 8) are provided in the cylinder head (9) which
works as air outlet and air inlet valves. In the existing air
compressors, the connecting rod (2) being forged rigid rod, in
case of misalignment there is a great wear and tear of piston,
bearing, piston rings and gudgeon pin (5), which thus increase
the maintenance cost.
Piston rubs with cylinder walls, which causes over heating. Air
inlet and outlet valves accumulate dust and cause leakage
besides frequent maintenance. Thus, the existing air
compressor requires more maintenance by skilied mechanica!
persons. Gudgeon pin (5) on wearïng out causes more noise
and piston rings on wearing out cause leakage. These problems
are obviated in the improved air compressor as shown in Fig 3
to 10, according to an embodiment of this invention, comprises
a cylinder head (11). having fins (12) and a ball type air-outlet
valve (13). A piston (14) is provided with a plurality of air
passages (15), a central threaded hole (16) and cavity (17)
formed at one end in between the projected collar (18). A
washer (19) having a central hole (20) is provided with plurality
of air passages (21). A washer shaped tloating type non-return
air inlet valve (22) preferably made of non metallic carbon
filled PTFE material and having a central hole (23) is
4

accommodated in the cavity (17) of the piston (14). A
compression ring (24) is preferably made of PTFE, which is
expandable in nature. An angular cross section is provided at
one end of the piston (14) with the help of a washer (19) and a
screw (25) tightened in the threaded hole (16) in the piston
(14). The outer periphery of the compression ring (24) is made
spherical to provide a point contact with the inner surface of
the cylinder (26). A connecting rod (30) attached with a
moulded Nylon ring (27) having housing (28) enclosing therein
a bearing (29) at one end and external threads (31) at other
end.
The threads (31) are screwed into threaded hole (16) in the
piston (14). A checknut (32) is also provided for tightening of
the connecting rod (30) after screwing it into the piston (14).
The moulded ring (27) and housing (28) are made up of nylon
or any partially flexible plastic. The bearing (29) of the
connecting rod (30) is fitted over an eccentric pivot pin (33) of
a flywheel (34). The flywheel (34) is provided with power
transmission system (Not shown) for rotating the same.
Rotary motion of the flywheel (34) causes reciprocating motion
of the piston (14) inside the cylïnder (26). When the piston (14)
moves upward, air in the space above the piston (14) and in
between the washer (19) and cylinder head (11) gets
compressed and the floating type non-return inlet (22) closes
the air passages (15) in the piston (14). The compressed air
opens fhe ball type outlet valve (13) and the air is released.
When the piston (14) moves downward, vacuüm is created in
between the piston (14) and cylinder head (11). As the ball
type air outlet valve (13) is closed, air enters through holes (15)
as the return air inlet vaive (22) moves away from the piston
(14) and rests over the washer (19). Air passes through holes
(21) in the washer (19) and gets filled into the cylinder (26)
above of the piston (14). Thus the floating type non return air
inlet valve create an unidirectional air flow through the piston
(14) which cools the piston (14) and the compression ring (24)
and prevents them from overheating, as the inlet air works as
coolant. The connecting rod (30) is tightly screwed in the piston
(14) without gudgeon pin (5), which permits piston movement
inside the cylinder (26) in cross/tilted position. The construction
of the compression ring (24) made of carbon filled PTFE having
spherical outer surface and outer diameter perfectly matching
with inner diameter of the cylinder (26), keeps the airtight
5

1 contact, which prevents any air leakage through the piston (14).
Further the compressed air causes the flexible PTFE compression ring
(24) remains in the normal condition. The ball type valve (13) does
not accumulate dust and thus the system requires less maintenance.
Piston. (14) does not come in contact with the cylinder (26) hence
less wear and tear makes the system more efficiënt. As there is no
gudgeon pin, system is less noisy. The user himself can carry out the
maintenance, as the part to wear out is only the compression ring
(24), which can be replaced by simply opening the screw (25).
The above description with reference to drawings is given only to
understand the invention rather than to limit its scope.
I CLAIM:
1. An improved air compressor consisting of a cylinder with cylinder
head provided with a ball type non return air inlet valve and a piston
provided with a plurality of air passages having a cavity at one end
and a threaded central hole other end; a floating type non return air
inlet valve made up of a non metallic carbon filled Poly Tetra Fluoro
Ethylene with central hole accommodated in the said cavity of the
piston; a non metallic compression ring, supported by a washer
having a plurality of air passages, fitted at one end of the piston at its
outer periphery with the help of a screw passing through the said
washer and non return air inlet valve engaging into the threaded hole
in the piston,; a connecting rod attached with a moulded Nylon ring
having housing enclosing therein a bearing at one end
and external threads at other end for screwing the said connecting
rod into the threaded hole in the piston; the said connecting rod
being mounted over an eccentric pivot pin fitted to a flywheel and a
power transmission system for rotating the said fly wheel.
2. An improved air compressor as claimed in l wherein a checknut is
provided for tightening the said connecting rod screwed in the piston.
3. An improved air compressor as claimed in any of the
preceding claims, wherein a compression ring
is preferably made of Poly Tetra Fluoro ; Ethylene, which is
6

expandable in nature with diameter same as the inner
diameter of the cylinder with spherical outer surface to
provide point contact.
4. An improved air compressor as claimed in any of the
preceding claims, wherein a connecting rad is attached
with a moulded ring made up of nylon or any partially
flexible plastic material with housing provided at one end
which enclosing a bearing inside it.
5. An improved air compressor as claimed in any of the
preceding claims, wherein the non return air inlet valve
are placed with in piston itself to provide unidirectional
flow of air as well as cooling to piston and compression
ring by using air as coolant.
6. An improved air compressor as claimed in any of the
preceding claims, wherein the cylinder and cylinder head
are provided with the fins.
7
7. An improved air compressor substantially, as herein
described and illustrated in Fig 3 to 10 of the
accompanying drawings.



Documents:

830-mum-2002-abstract(26-8-2003).pdf

830-mum-2002-abstract(27-2-2004).pdf

830-mum-2002-abstract(granted)-(12-7-2005).pdf

830-mum-2002-cancelled pages(27-2-2004).pdf

830-mum-2002-claims(19-9-2002).pdf

830-mum-2002-claims(26-8-2003).pdf

830-mum-2002-claims(granted)-(12-7-2005).pdf

830-mum-2002-claims(provisional)-(26-8-2003).pdf

830-mum-2002-correspondence(18-7-2005).pdf

830-mum-2002-correspondence(ipo)-(30-7-2004).pdf

830-MUM-2002-CORRESPONDENCE(IPO)-(7-10-2005).pdf

830-mum-2002-description(complete)-(19-9-2002).pdf

830-mum-2002-description(complete)-(26-8-2003).pdf

830-mum-2002-description(granted)-(12-7-2005).pdf

830-mum-2002-description(provisional)-(26-8-2003).pdf

830-mum-2002-drawing(19-9-2002).pdf

830-mum-2002-drawing(26-8-2003).pdf

830-mum-2002-drawing(27-2-2004).pdf

830-mum-2002-drawing(granted)-(12-7-2005).pdf

830-mum-2002-drawing(provisional)-(26-8-2003).pdf

830-mum-2002-form 1(19-9-2002).pdf

830-mum-2002-form 19(25-8-2003).pdf

830-mum-2002-form 2(complete)-(19-9-2002).pdf

830-mum-2002-form 2(complete)-(26-8-2003).pdf

830-mum-2002-form 2(granted)-(12-7-2005).pdf

830-mum-2002-form 2(provisional)-(26-8-2003).pdf

830-mum-2002-form 2(title page)-(complete)-(19-9-2002).pdf

830-mum-2002-form 2(title page)-(complete)-(26-8-2003).pdf

830-mum-2002-form 2(title page)-(granted)-(12-7-2005).pdf

830-mum-2002-form 2(title page)-(provisional)-(26-8-2003).pdf

830-mum-2002-form 26(19-9-2002).pdf

830-mum-2002-form 3(25-11-2002).pdf

830-mum-2002-form 3(26-8-2003).pdf

830-mum-2002-specification(amended)-(27-2-2004).pdf


Patent Number 195944
Indian Patent Application Number 830/MUM/2002
PG Journal Number 29/2010
Publication Date 16-Jul-2010
Grant Date
Date of Filing 19-Sep-2002
Name of Patentee SAVALIA RAVJIBHAI MADHABHAI
Applicant Address C/0, SAVALIA RESERCH CENTER, OPP:137, LAST BUS STOP, NR:KAMDAR KALYAN KENDRA, NEW BAPUNAGAR AHMEDABAD-380024, GUJARAT,INDIA.
Inventors:
# Inventor's Name Inventor's Address
1 SAVALIA RAVJIBHAI MADHABHAI C/0, SAVALIA RESERCH CENTER, OPP:137, LAST BUS STOP, NR:KAMDAR KALYAN KENDRA, NEW BAPUNAGAR AHMEDABAD-380024, GUJARAT,INDIA.
PCT International Classification Number F04B023/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA