06776081 is referenced by 4 patents and cites 2 patents.

A pneumatic actuator system is provided which includes one or more piston-cylinder type actuators (

14

) intended for crust breaking operations at electrolytic alumina reduction baths. Each actuator (

14

) includes a working piston (

21

), and a piston rod (

22

) carrying a crust breaking working implement (

17

). A control circuit having a directional valve (

24

) is arranged to operate the actuator piston (

21

) in alternative directions. The control circuit includes air feed flow restrictions (

26, 27

), end position sensors (

28, 29

) and air feed shut-off valves (

30, 31

) for minimizing the pressure air volume needed for accomplishing complete working strokes of the actuator piston (

21

) at varying crust layer thickness.

Title
Pneumatic actuator system
Application Number
10/344337
Publication Number
6776081 (B2)
Application Date
February 11, 2003
Publication Date
August 17, 2004
Inventor
Stig Erling Gustavsson
Brämhult
US
Tom Allan Casinge
Mullsjö
US
Agent
Frishauf Holtz Goodman & Chick P C
US
Assignee
Parker Hannifin
US
IPC
F15B 15/028
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