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Class Information
Number: 92/255
Name: Expansible chamber devices > Piston > Plural separable parts
Description: Apparatus in which the piston is formed of a plurality of members joined together by means which allow separation of the parts from each other without in any way destroying or permanently deforming any of the members or the means for joining the parts.

Sub-classes under this class:

Class Number Class Name Patents
92/256 Fastening means for parts include resilient element 43
92/259 Side wall portion and relatively movable piston part having abutting inclined surfaces 6
92/257 Side wall portion interposed between separable axially spaced rigid members 28

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8631736 Two-part piston for an internal combustion engine Jan. 21, 2014
8616114 Piston with central directional oil flow and wrist pin lubrication feature and method of construction thereof Dec. 31, 2013
8584626 Piston for an internal combustion engine Nov. 19, 2013
8561522 Hydraulic cylinder Oct. 22, 2013
8439001 Actuator powered by fluid and method of forming the same May. 14, 2013
8438967 Piston portion for a piston assembly and a piston assembly May. 14, 2013
8402879 Tool for screwing a piston onto the piston rod of a hydraulic cylinder and hydraulic cylinder Mar. 26, 2013
8398008 Force transfer system comprising a hydraulic cylinder and a thrust bearing Mar. 19, 2013
8191461 Hydraulic cylinder piston Jun. 5, 2012
8171841 Detachable connecting rod and compressor having the same May. 8, 2012
8162184 Follower packing unit for grease guns and the like Apr. 24, 2012
8122812 Piston and cylinder unit Feb. 28, 2012
7950322 Plunger assembly May. 31, 2011
7900552 Piston for cold chamber die-casting machine Mar. 8, 2011
7895978 Non-polluting two-stroke engine with air-cooled piston Mar. 1, 2011
7874242 Piston assembly in fluid pressure cylinder Jan. 25, 2011
7870819 Piston device and manufacturing method thereof Jan. 18, 2011
7584694 Composite piston for an internal combustion engine Sep. 8, 2009
7516691 Hydraulic linear drive, particularly a hydraulic transmission actuator Apr. 14, 2009
7513191 Piston head for hydraulic injection molding machine Apr. 7, 2009
7357066 Sealing structure of an up-down type piston assembly for exhausting a content Apr. 15, 2008
7353749 Piston retention apparatus and method Apr. 8, 2008
7350454 Cylinder unit for mounting on a cross member and/or a table of a device or machine for the deformation of workpieces Apr. 1, 2008
7341037 Engine piston and manufacture Mar. 11, 2008
7296507 Piston for automatic transmission Nov. 20, 2007
7273004 Reciprocating machine Sep. 25, 2007
7258060 Piston and scraper assembly Aug. 21, 2007
7255038 Piston for automatic transmission Aug. 14, 2007
7228788 Piston structure for an air pump Jun. 12, 2007
7225726 Piston for automatic transmission Jun. 5, 2007
7197976 Composite piston Apr. 3, 2007
7174829 Adjustable piston pump Feb. 13, 2007
7131418 Cooled piston for an internal combustion engine Nov. 7, 2006
7093361 Method of assembling an actuator with an internal sensor Aug. 22, 2006
7093529 Composite piston Aug. 22, 2006
7063004 Piston assembly Jun. 20, 2006
6892625 Double rod end cylinder with split ring coupling May. 17, 2005
6837144 Piston and cylinder unit including a housing, a piston and a piston rod Jan. 4, 2005
6834575 Piston assembly for a radial piston hydraulic motor Dec. 28, 2004
6823769 Device and method for fixing a piston or a piston rod attachment to a piston rod Nov. 30, 2004
6817278 Piston assembly for hydraulic cylinder Nov. 16, 2004
6763758 Multi-part cooled piston for an internal combustion engine Jul. 20, 2004
6637316 Pressure fluid cylinder with optional anti-rotation feature Oct. 28, 2003
6471496 Piston pump for a vehicle brake system Oct. 29, 2002
6378304 Hydraulic control device for motor vehicle clutch in particular Apr. 30, 2002
RE37565 Piston-cylinder assembly Mar. 5, 2002
6327964 Reciprocating pump Dec. 11, 2001
6321951 Dispensing apparatus Nov. 27, 2001
6318236 Reciprocal motion type compressor having a piston in which strength is increased Nov. 20, 2001
6276261 Piston assembly of a hydraulic radial piston-type machine Aug. 21, 2001

1 2 3

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