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PISTONS {(specially adapted for dampers F16F 9/32)}; CYLINDERS; SEALINGS
Definition statement
This subclass/group covers:
  • Pistons, i.e. moving components for transferring a force to or from a fluid
  • Cylinders, i.e. chambers in which a piston travels
  • Pressure vessels, i.e. enclosure to seal fluid from the environment
  • Sealings, i.e. barriers for preventing fluid leakage
References relevant to classification in this group
This subclass/group does not cover:

Examples of places where the subject matter of this subclass is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Pressure cookers

Sealing building joints

Machines or engines of reciprocating type

Cylinders of combustion engines

Pistons for combustion engines

Sealings of non-positive displacement pumps

Pistons specially adapted for dampers

Sealing devices for sliding parts of gas holders of variable capacity

Arrangements for sealing elements into header boxes or end plates of heat exchangers

Pistons; Trunk pistons; Plungers (bellows pistons F16J 3/06; piston-rings or seats therefor F16J 9/00; {manufacture of pistons B23P 15/10}; rotary pistons, e.g. for "Wankel" type engines F01C; specific for combustion engines, i.e. constructed to withstand high temperature or modified for guiding, igniting, vaporising or otherwise treating the charge F02F; {pistons for hydraulic engines F03C}; pumps F04B; floats F16K 33/00)
Definition statement
This subclass/group covers:

Pistons not specific to a particular use.

References relevant to classification in this group
This subclass/group does not cover:

Rotary pistons, e.g. for "Wankel" type engines

Pistons for hydraulic engines

Pumps

Floats

Informative references
Attention is drawn to the following places, which may be of interest for search:

Manufacture of pistons

Bellows pistons

Piston-rings or seats therefore

Diaphragms; Bellows; Bellows pistons (connection of valves to inflatable elastic bodies B60C 29/00; bellows or the like used in instruments G12B 1/04; diaphragms for electromechanical transducers H04R 7/00)
Definition statement
This subclass/group covers:

Diaphragm, bellows and bellow pistons not specific to a particular use

Informative references
Attention is drawn to the following places, which may be of interest for search:

Connection of valves to inflatable elastic bodies

Bellows or the like used in instruments

Diaphragms for electromechanical transducers

Piston-rods
Definition statement
This subclass/group covers:

Piston-rods not specific to a particular use

Piston-rings, {e.g. non-metallic piston-rings}, seats therefor; Ring sealings of similar construction in general (other sealings between pistons and cylinders F16J 3/06, F16J 15/16; {manufacture of piston-rings B23P 15/06, B23P 15/08}; tools for mounting or removing piston-rings or the like B25B; piston sealing arrangements on brake master cylinders B60T 11/236; {sealing provided on pump pistons F04B 53/143})
Definition statement
This subclass/group covers:

Piston-rings or piston-ring expanders metallic or non-metallic; Seats therefore

References relevant to classification in this group
This subclass/group does not cover:

Ring sealing of similar construction in general also when used between pistons and cylinders

Informative references
Attention is drawn to the following places, which may be of interest for search:

Manufacture of piston-rings

Tools for mounting or removing piston-rings or the like

Sealing arrangement on brake master cylinder

Sealing provided on pump pistons

Special rules of classification within this group

Piston rings specific for combustion engines are classified in F16J 9/00 not in F02F 5/00

Engine or like cylinders (pressure vessels in general F16J 12/00; cylinders for engines or other apparatus of particular kinds, see the appropriate subclasses, e.g. for combustion engines F02F); Features of hollow, e.g. cylindrical, bodies in general
Informative references
Attention is drawn to the following places, which may be of interest for search:

Cylinders for engines or other apparatus of particular kinds, see the appropriate subclasses, e.g. for combustion engines

Pressure vessels in general

Pressure vessels in general (covers therefor F16J 13/00; for particular applications, see the relevant subclasses, e.g. B01J, F17C, G21C)
References relevant to classification in this group
This subclass/group does not cover:

Copvers for pressure vessels

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Pressure vessels, or vacuum vessels for chemical or physical processes having closure members or seals specially adapted therefor

Pressure vessels for chemical or physical processes, e.g. autoclaves

Pressure vessels for containing or storing compressed, liquefied or solidified gases

Nuclear pressure vessels

Covers or similar closure members for pressure vessels in general (for engines or like cylinders F16J 10/00; sealings F16J 15/02; covers for box-like containers B65D 43/00; devices for securing or retaining closure members B65D 45/00; closures for containers not otherwise provided for B65D 51/00; manholes, covers for large containers B65D 90/10; gates or closures for large containers B65D 90/54; for vessels for containing or storing compressed, liquefied or solidified gases F17C 13/06; steam boilers F22B)
Informative references
Attention is drawn to the following places, which may be of interest for search:

Covers for box-like containers

Devices for securing or retaining closures members

Closures for containers not otherwise provided for

Manholes, covers for large containers

Gates or closures for large containers

For engines or like cylinder

Sealings

For vessels storing compressed, liquefied or solidified gasses

Steam boilers

Sealings (sealing arrangements for vehicle windows, windscreens, non-fixed roofs, doors, or similar devices B60J 10/00; sealing or packing elements for container closures B65D 53/00; sealing arrangements in rotary-piston machines or engines F01C 19/00; sealings in non-positive-displacement machines or engines F01D 11/00; arrangements of sealings in combustion engines F02F 11/00; sealing arrangements in rotary-piston pumps F04C 27/00; sealing lead-in or lead-through insulators H01B 17/30)
Definition statement
This subclass/group covers:

Sealing means that acts at a joint or juncture of adjacent parts

References relevant to classification in this group
This subclass/group does not cover:

Examples of places where the subject matter of this group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Sealing arrangements for vehicle windows, non-fixed roofs, doors, or similar devices

Sealing or packing elements for container closures

Sealing arrangements in rotary-piston machines or engines

Sealings in non-positive-displacement machines or engines

Arrangements or sealings in combustion engines

Sealing and arrangements in rotary-piston pumps

Sealing of non-positive displacement pumps

Arrangements for sealing elements into header boxes or end plates of heat-exchangers

Sealing lead-in or lead-through insulators

{comprising at least two sealings in succession (F16J 15/162, F16J 15/40 take precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Special parts or details relating to lubrication or cooling of the sealing itself

Sealings by means of fluid

{with division of the pressure (F16J 15/44 takes precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Free-space packings

between relatively-stationary surfaces (F16J 15/46, F16J 15/48 take precedence)
References relevant to classification in this group
This subclass/group does not cover:

Sealings with packing ring expanded or pressed into place by fluid pressure

Sealings influenced by the pressure within the member to be sealed

{with elastic packing (F16J 15/08 takes precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Sealings with exclusively metal packing

{with positioning means (F16J 15/0831 takes precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Flat gasket with mounting aids

between relatively moving surfaces (F16J 15/50, F16J 15/52 take precedence; bellows pistons F16J 3/06; piston-rings or ring sealing of similar construction in general F16J 9/00; spindle sealings for valves F16K 41/00)
References relevant to classification in this group
This subclass/group does not cover:

Piston-rings or ring sealing of similar construction in general

Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces

Sealings by means of sealing bellows or diaphragms

Informative references
Attention is drawn to the following places, which may be of interest for search:

Bellows pistons

Spindle sealings for valves

{Special parts or details relating to lubrication or cooling of the sealing itself (F16J 15/324, F16J 15/3404, F16J 15/40 take precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Details relating to lubrication or cooling of the sealing itself

Sealings and characterised by parts or details relating to lubrication, cooling or venting of the seal

Sealings by means of fluid

with elastic sealing lip {with elastic sealing, e.g. "O" ring; F16J 15/34 takes precedence}
References relevant to classification in this group
This subclass/group does not cover:

Sealings with slip-ring pressed against a more or less radial face on one member

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:

In this group the following terms (or expressions) are used with the meaning indicated:

Lip

any flexible tapered or rounded part contacting the surface to be sealed e.g. O-ring

{with a plurality of lips (F16J 15/3208 to F16J 15/3228 take precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Sealings provided with a spring-tension element

Sealings formed by deforming a flat annular ring

{Details relating to lubrication or cooling of the sealing itself (in general F16J 15/162)}
Informative references
Attention is drawn to the following places, which may be of interest for search:

For seals other than lip seals

{Measuring or controlling equipment specially adapted for elastic sealings (measuring in general G01; Controlling in general G05)}
Informative references
Attention is drawn to the following places, which may be of interest for search:

Measuring in general

G01

Controlling in general

G05

{with cavities (F16J 15/3424 takes precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Sealings with micro-cavities

characterised by the use of particular materials {(F16J 15/444 takes precedence)}
References relevant to classification in this group
This subclass/group does not cover:

Sealings with facing materials having honeycomb-like structure

with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings (connection of valves to inflatable elastic bodies B60C 29/00; {for sealing arrangements in vehicles B60J 10/0037; for sealing arrangements of openings in buildings E06B 7/2318}; for tube connections F16L)
Informative references
Attention is drawn to the following places, which may be of interest for search:

Connection of valves to inflatable elastic bodies

For sealing arrangements in vehicles

For sealing arrangements of openings in buildings

For tube connections

by means of sealing bellows or diaphragms (connection of valves to inflatable elastic bodies B60C 29/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:

Connection of valves to inflatable elastic bodies

Diaphragm or bellow itself

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Last Modified: 10/11/2013