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PISTONS [N: (specially adapted for dampers F16F 9/32 )]; CYLINDERS; SEALINGS
Pistons; Trunk pistons; Plungers (bellows pistons F16J 3/06 ; piston-rings or seats therefore F16J 9/00 ; [N: 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 ; [N: 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, [N: 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 ; [N: 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 ; [N: 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 therefore F16J 13/00 ; for particular applications, see the relevant subclasses, e.g. B01J , F17C , G21C )
Informative references
Attention is drawn to the following places, which may be of interest for search:
For particular use see the relevant subclass -for chemical or physical processes -for storing compressed, liquefied or solidified gasses-nuclear reactors
Cover therefore
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 boiler
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:
Sealing arrangements for vehicle windows, non-fixed roofs, doors, or similar devices
Sealing or packing elements for container closures
Sealing lead-in or lead-through insulators
Informative references
Attention is drawn to the following places, which may be of interest for search:
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
[N: 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
[N: 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
[N: 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
[N: 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
[N: 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 sea
Sealings by means of fluid
with elastic sealing lip [N: 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
[N: 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
[N: 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
[N: 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
[N: 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 [N: (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 ; [N: for sealing arrangements in vehicles B60J10/00B ; 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
B60J10/00B
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
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Last Modified: 10/11/2013