Kenneth L Thompson

US Patent:

6837145, Jan 4, 2005

Filed:

Dec 18, 2002

Appl. No.:

10/323203

Inventors:

William Earl McBride - Tulsa OK, US
Kenneth E. Thompson - Tulsa OK, US

Assignee:

Air Power Systems Co., Inc. - Tulsa OK

International Classification:

F15B 13042

US Classification:

92131, 92187, 92189, 13762566

Abstract:

A three position fluid powered actuator having a piston reciprocally positioned within a cylindrical chamber in a body. The piston has a socket in communication with an axial opening through the piston. A piston shaft has a first end passing through the axial opening and into the socket and has a second end passing through a spring chamber in the body. A compression spring surrounds the piston shaft in the spring chamber. A pair of fluid passageways extend into the cylindrical chamber, whereby fluid pressure in a first passageway will move the piston in a first direction and fluid pressure in a second passageway will move the piston in a second direction.

US Patent:

8297586, Oct 30, 2012

Filed:

Aug 24, 2006

Appl. No.:

11/509274

Inventors:

Kenneth E. Thompson - Tulsa OK, US

Assignee:

Air Power Systems Company, Inc. - Tulsa OK

International Classification:

F16K 31/00

US Classification:

251 636, 251282, 251322, 251323, 251337, 251 31, 92131

Abstract:

A proportional control pneumatic cylinder as an air actuator device for a hydraulic pump valve having a valve spool moving in a bore in a valve housing. The device having an actuator housing attachable to the valve housing and having a bore carrying a piston coaxially secured to an end of the valve spool. The device provided with spaced openings in the actuator housing which communicate with the bore therein to introduce air to act on opposite sides of the piston, and factory pretensioned biasing means for normally urging the piston and spool to a center closed position. Surface areas on opposite sides of the piston are approximately equal so that piston movement is approximately proportional to movement of an actuating lever of an air supplying pneumatic control valve over the majority of the range of travel of the actuating lever for both raised and lowered positions.