David L Sigl

US Patent:

7553408, Jun 30, 2009

Filed:

Mar 7, 2006

Appl. No.:

11/369352

Inventors:

Dwayne Alan Nystrom - Waterloo IA, US
David Leo Sigl - Waterloo IA, US
Brian Daniel Durbin - Waverly IA, US
Scott E. Davison - Cedar Falls IA, US
Reno Antonio Rodeghiero - Hudson IA, US

Assignee:

Deere & Company - Moline IL

International Classification:

B01D 29/01
F15B 21/04

US Classification:

210109, 21016705, 123196 A

Abstract:

A vehicle hydraulic system includes a lube circuit, a pump supplying hydraulic fluid from sump to first and a second hydraulic control circuits and a filter circuit. The filter circuit includes a first outlet connected to the lube circuit, a sump line, and a second outlet connected to the pump. A suction filter is connected between the sump line and second outlet. A return filter is connected to the first control circuit outlet. A return line having an orifice is connected between the return filter and the first outlet. A backpressure valve has a member, an outlet connected to the second outlet, and an inlet and pilot line connected to the return filter outlet. A pressure sense line has one end connected to the return line between the orifice and the first outlet, and a second end connected to the member in opposition to the pilot line.

US Patent:

7798241, Sep 21, 2010

Filed:

Sep 19, 2008

Appl. No.:

12/233863

Inventors:

Norman Everett Muzzy - Cedar Falls IA, US
David Leo Sigl - Waterloo IA, US
Shawn Robert Simons - Cedar Falls IA, US
Jesse Ray Knight - Waterloo IA, US

Assignee:

Deere & Company - Moline IL

International Classification:

A01B 63/112

US Classification:

172 7, 172239

Abstract:

A mechanical hitch control system for a vehicle includes a draft force sensing member, a mechanical hitch control unit, a hitch valve actuator, and a cable transmitting a draft force signal to the hitch control unit. A draft cam is coupled to the draft force sensing and setting members. A position cam is coupled to the position setting member and to a hitch position sensing member. A draft pickup cam is coupled to the draft cam and pivotally mounted on the hitch position setting member. At least one of the cams is operatively engagable with the hitch valve actuator. The cams are enclosed by housing with an opening covered by a removable side plate. The cams and levers are coupled to input members which are inserted through the side plate. The assembled cams, levers and input members are then installed into the housing through the opening.

US Patent:

20040206407, Oct 21, 2004

Filed:

Apr 18, 2003

Appl. No.:

10/418969

Inventors:

Dennis Courtright - Portland OR, US
John Tow - Easley SC, US
David Sigl - Charlotte NC, US

Assignee:

SAUER-DANFOSS INC. - Ames IA

International Classification:

F16K011/04

US Classification:

137/625210

Abstract:

A selectable detent relief valve of this invention is used to operate a hydraulic detent mechanism on a manually operated spool valve. This design has three modes of operation, no-detent, continuous detent and kick-out detent. The no-detent position allows flow to pass through the relief valve, from a first port to a second port and bypass the relief function. The pressure created, disengages the detent mechanism in the spool valve. The spool always returns to neutral position as long as pressure is present. The continuous detent position blocks the flow from a first port to a second port. The kick-out detent position allows flow to pass from the first port to the second port to override (kick-out) the detent mechanism in the spool when the pressure is greater than 2600 psi.