This document discusses four patents for piston designs: 1) Patent #US1426138A from 1922 describes a piston made of lightweight aluminum alloys to prevent corrosion. 2) Patent #US2513814A from 1950 relates to pistons made of materials like magnesium that expand more than the cylinder, addressing expansion issues. 3) Patent #US3398653A from 1968 introduces an anti-friction piston with roller bearings mounted to reduce friction between the piston and cylinder. 4) Patent #US1524715A from 1925 discloses a ringless piston design that presses directly on the cylinder wall to prevent gas leakage without separate piston rings.

1. PATENT
EXPLORATION
Name- Vivek Singh
Reg. No.- 11702662
Section- M1751
Roll No.-A28
PISTON

2. INTRODUCTI
ON
In an engine, its purpose is to transfer force from
expanding gas in the cylinder to the crankshaft via
a piston rod and/or connecting rod.

3. Patent Number-US1426138A
Filed-1919-01-09
Date Of Patent-1922-08-15
Assignee-Aluminum Manufactures Inc
Inventor-Edmund E Allyne
This invention relates to
improvements in pistons for
internal combustion engines and
to the process of producing said
pistons. It relates especially to
pistons made of aluminum alloys
or other light weight metals which
are subject in operation to
corrosion resulting in so called
pittingf.
PISTO
N

4. Patent Number-US2513814A
Filed-1947-01-21
Date Of Patent-1950-07-04
Assignee-Arconic Inc
Inventor-George L Moore
This invention relates to pistons for
internal combustion engines or for
like purposes and is principally
concerned with problems attendant
upon the use of a piston material,
such as magnesium or aluminum
alloy, which is relatively expansible in
the sense that it has a higher
cofficient of expansion than the
material of the cylinder in which the
piston is designed to operate.
PISTO
N

5. Patent Number-US3398653A
Filed-1966-08-24
Date Of Patent-1968-08-27
Assignee-John D. Foster
Inventor-John D. Foster
This invention relates to an
anti-friction reciprocating
piston. More particularly,
this invention relates to a
piston in which roller
bearings are mounted so
that friction may be
reduced between the piston
and a cylinder.
FRICTIONLESS
PISTON

6. Patent Number-US1524715A
Filed-1923-06-30
Date Of Patent-1925-02-03
Assignee-Klatzke William
Inventor-Klatzke William
This invention relates to pistons
for internal combustion.
engines, and has for its primary
object the provision of a one-
piece piston operable without
the use of piston rings or other
separable packing to closely
press against the cylinder wall
and prevent the leakage of the
combustible gas around the
piston during the operation of
the/engine.
RINGLESS
PISTON

7. COMPARISIO
N
Patent Number-
US1426138A
• This piston is
made up of
aluminium alloys
or any other light
weight metals.
• Materials used
to make is anti
corrosive in
nature.
Patent Number-
US2513814A
*This piston have the
skirt oval cross
section, which, when
it is heated it should
not produce excessive-
sciffing or friction.
* it is made up of a
material which have
more coefficient of
expansion.
Patent
Number-
US3398653A
*This piston is a
friction less/ anti
friction piston.
* In this piston the
roller bearings are
mounted to
reduce the
friction .
Patent Number-
US1524715A
• This piston is ring
less piston, in which
the piston rings are
not mounted.
• Another difference is
the construction of
this piston from
another simple
piston.

8. THANK YOU