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Class Information
Number: 91/224
Name: Motors: expansible chamber type > Cyclically operable > Distributor in piston (422) > Distributor establishes communication between opposite faces of piston
Description: Apparatus in which the distributor controls a passage in the piston which is adapted to convey fluid through a working face of the piston to a face which is axially opposed.


Patents under this class:
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Patent Number Title Of Patent Date Issued
7162944 Continuous reciprocating linear motion device Jan. 16, 2007
6745664 Paint shaker and motor therefor Jun. 8, 2004
6684753 Reciprocating differential hydraulic machine, especially a differential hydraulic machine Feb. 3, 2004
6663360 Fluid injection pump with internal air actuator valve Dec. 16, 2003
6520076 Oil pressure device Feb. 18, 2003
6505538 Multicylinder self-starting uniflow engine Jan. 14, 2003
6499384 Piston apparatus for gas/liquid pipeline Dec. 31, 2002
6415704 Pneumatic oil pump Jul. 9, 2002
6398527 Reciprocating motor with uni-directional fluid flow Jun. 4, 2002
6266847 Door operator and process for operation of a door operator Jul. 31, 2001
6065387 Piston apparatus for gas/liquid pipeline May. 23, 2000
6012377 Shuttle valve of a reciprocating pneumatic motor for hydraulics Jan. 11, 2000
5806403 Multicylinder self-starting uniflow engine Sep. 15, 1998
5683230 Pressure medium driven device performing linear motion Nov. 4, 1997
5540136 Reciprocating piston motor operating on pressure medium Jul. 30, 1996
5513963 Direct action fluid motor and injection pump May. 7, 1996
5341723 Reciprocating pneumatic motor for hydraulics Aug. 30, 1994
5275085 Control device for pneumatic cylinder Jan. 4, 1994
5243897 Magnetically actuated fluid motor Sep. 14, 1993
RE34301 Fluid operable engine Jul. 6, 1993
5209152 Airfoil changeover device May. 11, 1993
5203251 Motor with spring elements formed on valve assembly Apr. 20, 1993
5197285 Modular digital actuator Mar. 30, 1993
5188518 Pumping device driven by a fluid driven reciprocating actuator Feb. 23, 1993
5137435 Compression spring fluid motor Aug. 11, 1992
5120202 Switching device for reciprocating pumps Jun. 9, 1992
5065824 Hydraulically powered repetitive impact hammer Nov. 19, 1991
5002468 Switching device for reciprocating pumps Mar. 26, 1991
4955923 Hydraulically operated dockboard Sep. 11, 1990
4949622 Fluid operable engine Aug. 21, 1990
4895305 Oscillating piston driven sprinkler Jan. 23, 1990
4879943 Expansible chamber motor with snap-acting valve Nov. 14, 1989
4807321 Air cleaning system Feb. 28, 1989
4756329 Devices for the injection of an additive product metered into a main fluid Jul. 12, 1988
4743171 Marine installation including fuel/oil mixing device May. 10, 1988
4660658 Hydraulic down-the-hole rock drill Apr. 28, 1987
4587732 Cable cutting and crimping May. 13, 1986
4544335 Piston and valve assembly Oct. 1, 1985
4521963 Hydraulic cable and rod cutting and crimping device Jun. 11, 1985
4473340 Combined fluid pressure actuated fuel and oil pump Sep. 25, 1984
4458579 Hydraulically driven reciprocating motor Jul. 10, 1984
4450920 Hydraulic reciprocating machines May. 29, 1984
4354421 Energy recovery reciprocating engine Oct. 19, 1982
4352644 Air-hydraulic pump Oct. 5, 1982
4290489 Vibrationless pneumatic tools Sep. 22, 1981
4286929 Dual pressure gas motor, and method of operation Sep. 1, 1981
4165759 Delivering measured quantities of liquid into a fluid Aug. 28, 1979
4127057 Reciprocating fluid stroke motors with automatic control Nov. 28, 1978
4118154 Hydraulically actuated pump assembly Oct. 3, 1978
4096747 Digital output, positive displacement flow meter Jun. 27, 1978

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