Kenneth Ryan Kramer

US Patent:

44373856, Mar 20, 1984

Filed:

Apr 1, 1982

Appl. No.:

6/364373

Inventors:

Kenneth D. Kramer - Waterloo IA
Edward H. Fletcher - Waterloo IA

Assignee:

Deere & Company - Moline IL

International Classification:

F15B 1316

US Classification:

91361

Abstract:

A control system for controlling a double-acting cylinder includes four pilot-operated, proportional-type poppet valves for controlling fluid flow between the cylinder, a pump and a reservoir. Four solenoid-controlled pilot valves operate the poppet valves in response to error signals generated by a control circuit. The control circuit receives a cylinder position feedback signal and an operator-generated command signal. The control circuit provides for float, shutdown, variable deadband and pressure adjustment operation.

US Patent:

46797653, Jul 14, 1987

Filed:

Apr 14, 1986

Appl. No.:

6/853312

Inventors:

Kenneth D. Kramer - Waterloo IA
Rohn L. Olson - North Richland Hills TX

Assignee:

Deere & Company - Moline IL

International Classification:

F16K 31122

US Classification:

251 38

Abstract:

An orifice controlled poppet valve includes a pilot poppet pressure balancing arrangement which prevents fluid leakage between the valve inlet and outlet. The pressure balancing arrangement includes a pin slidable in a passage in the main valve member, which passage extends between the inlet and a pilot outlet passage. One end of the pin engages a stem which projects from from the pilot poppet. The other end of the pin engages a flexible diaphragm which forms a seal between the valve inlet and the passage which receives the pin. An inlet pilot passage includes an annular clearance upstream of an orifice. The radial dimension of the annular clearance is smaller than the diameter of the orifice.

US Patent:

44613148, Jul 24, 1984

Filed:

Sep 13, 1982

Appl. No.:

6/416836

Inventors:

Kenneth D. Kramer - Waterloo IA

Assignee:

Deere & Company - Moline IL

International Classification:

G05D 706
F15B 13044

US Classification:

137106

Abstract:

A 4-way, 3-position, on-off type electrohydraulic valve includes a pair of solenoid-operated inlet valves for controlling communication between a pump and a valve bore. A pair of adjustable check valves are positioned in opposite ends of the valve bore. A double-acting pilot return valve assembly is operably mounted in a central portion of the valve bore and is movable to engage and open one of the check valves to return fluid flow when pump pressure flows through the other check valve to a fluid motor.

US Patent:

RE338460, Mar 17, 1992

Filed:

Jan 22, 1990

Appl. No.:

7/468346

Inventors:

Kenneth D. Kramer - Waterloo IA
Edward H. Fletcher - Waterloo IA

Assignee:

Deere & Company - Moline IL

International Classification:

F15B 13043

US Classification:

91361

Abstract:

A control system for controlling a double-acting cylinder includes four pilot-operated, proportional-type poppet valves for controlling fluid flow between the cylinder, a pump and a reservoir. Four solenoid-controlled pilot valves operate the poppet valves in response to error signals generated by a control circuit. The control circuit receives a cylinder position feedback signal and an operator-generated command signal. The control circuit provides for float, shutdown, variable deadband and pressure adjustment operation.

US Patent:

45067007, Mar 26, 1985

Filed:

Oct 7, 1983

Appl. No.:

6/539785

Inventors:

Kenneth D. Kramer - Waterloo IA

Assignee:

Deere & Company - Moline IL

International Classification:

F15B 13043

US Classification:

13759616

Abstract:

A four-function valve for operating a 2-way hydraulic cylinder has a pair of solenoid-operated pilots. The valve also includes a pair of valve members and a pair of poppet members, all slidable within bores in a pair of hollow sleeves. The solenoid-operated pilot valves control pilot pressure communication to the valve members to control movement of the valve and poppet members. Each poppet member has a pair of seats, one engageable with a shoulder on the sleeve to control fluid flow between a pump and the cylinder, the other engageable with an end of the corresponding valve member to control fluid flow between a sump and the cylinder.

US Patent:

47996455, Jan 24, 1989

Filed:

Jan 19, 1988

Appl. No.:

7/145345

Inventors:

Kenneth D. Kramer - Waterloo IA
Gregory E. Sparks - Waterloo IA

Assignee:

Deere & Company - Moline IL

International Classification:

F16K 3140

US Classification:

251 3004

Abstract:

A pilot operated control valve includes a spool type pilot valve member which is coupled to the main valve member by a pair of springs so that both pilot pressure forces and spring forces act on the main valve member. The main valve member and the housing in which it moves enclose a damping chamber. A damping orifice extends through the main valve member and connects the damping chamber with a pilot pressure chamber to reduce vibration of the main valve member.

US Patent:

44196423, Dec 6, 1983

Filed:

Jan 28, 1982

Appl. No.:

6/343651

Inventors:

Kenneth D. Kramer - Waterloo IA
Kenneth J. Stoss - Stillwater OK
Gregory E. Sparks - Waterloo IA

Assignee:

Deere & Company - Moline IL

International Classification:

H01F 708

US Classification:

335227

Abstract:

A solenoid includes a coil, a pole assembly, an armature movable in the pole assembly and an air gap separating the armature from part of the pole assembly. A single mumetal washer may be fixed to the armature adjacent the air gap or a pair of mumetal washers may be fixed to the armature and to one of the pole parts on opposite sides of the air gap.