Abstract

A load sense connection is provided between the implement rockshaft cylinders and the load-sensed power source. However, to avoid tractor starting difficulty, a valve structure is provided in the power beyond fluid line to keep the fluid line closed when starting the tractor. This valve structure provides a hydraulic latching function that allows the load-sensed …

Legal parties

Party
Inventors (applicants): Aaron L. Barfels, William Douglas Graham
Assignees (initial): Deere & Company (Moline, US)

The application was examined by Michael Leslie (USPTO dept. 3745)

Claims

  • 1. An improvement in an active hydraulic down pressure system for an agricultural implement having …
  • 2. The system as defined in claim 1 wherein the valve means includes a normally …
  • 3. The system as defined by claim 2 wherein the first and second directional valves …

Cited documents

Patents

  • DE 19646449, May. 1, 1998
  • Henry et al. US 5687798 A, Nov. 1, 1997
  • Carlz US 2010/0078185 A1, Apr. 1, 2010
  • Carlz US 8056465 B2 / 91/447, Nov. 1, 2011
  • Graham et al. US 6000315 A, Dec. 1, 1999
  • Graham et al. US 7918285 B1 / 172/2, Apr. 1, 2011
  • Knussman et al. US 6460623 B1, Oct. 1, 2002
  • Hadley US 5065681 A, Nov. 1, 1991
  • Bettin US 6318477 B1, Nov. 1, 2001

Drawings

Brief Description of the Drawings

FIG. 1 is an exemplary hydraulic circuit diagram showing one implementation of the present invention; FIG. 2 is an exemplary hydraulic circuit diagram showing another implementation of the present …

Description

Field of the Invention

The present invention relates generally to agricultural implements and, more specifically, to an active down force system with a hydraulic circuit that reduces heat buildup and minimizes fuel …

Description of the Preferred Embodiment

Referring to FIG. 1 , a hydraulic circuit 100 is shown which includes a pair of tool lift and down pressure cylinders 112 connected in parallel by lines 114 and 116. …

More details about Active Implement Down Force System With Automatic Latching of Tractor Power Beyond Pressure

Miscellaneous patent data

Includes the following drawings: Exemplary hydraulic circuit diagram showing, Active Implement Down Force System, Exemplary hydraulic circuit diagram showing, the patent particularly claims an improvement in an active hydraulic down pressure system for an agricultural…, the examination was conducted by Michael Leslie, the main examiner (3745 USPTO department), categorized under Between working chamber and inlet and exhaust valve as a primary classification, the applicant's state - IA, city - Davenport, the applicant's last name is Barfels, and his first name is Aaron L., 12 claims comprise the protection scope, similar categories include controlling several interacting or sequentially-operating members, Moving cylinder having follow-up, Valve part moves about an axis, Control valve seating surface contact maintained by fluid pressure bias, electrical control means, in the form of a tube, Common features of fluid actuator systems, Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass, Assemblies of units, each for the control of a single servomotor only, Pilot valve actuator extends into working chamber, Extension of Unit Having Separately Controlled Working Chambers Equals Sum of Individual Chamber Extensions, the grant publication number is 08573111, the application number is 12/762,663 (U.S.), the grant publication date is Nov. 5, 2013, 3 figures are supplied with the description, the assignee location is Moline (US); its company is Deere & Company, the application was published on Apr. 19, 2010, the claim 1 is exemplary as chosen by the examiner, the patent extension term is 842 days, the inventor's city is East Moline, state - IL, the published inventor's name is William Douglas Graham, the invention description is illustrated by 2 drawings, the invention is named Active Implement Down Force System With Automatic Latching of Tractor Power Beyond Pressure, developed by Aaron L. Barfels et al., the assignee classification - a United States company.

Invention classification information

The invention is classified under Condition responsive control of pump or motor displacement, for use with a single servomotor, Between working chamber and inlet and exhaust valve, Another passage controlled by motive fluid pressure or flow responsive valve (468), One path includes restriction, using pumps with pistons or plungers working in cylinders. The designated search classifications include Between working chamber and inlet and exhaust valve, Condition responsive control of pump or motor displacement, Another passage controlled by motive fluid pressure or flow responsive valve (468), Plural actuators for single valve means (367), Including motive fluid pressure or flow responsive valve (468), Automatic Power Control, Contracting chamber exhaust valve controlled by expanding chamber pressure or flow, One path includes restriction.

Patent details
Publication number 08573111
Publication date Nov. 5, 2013
Kind code B2
Application number 12/762,663
Application date Apr. 19, 2010
Application type U
Application series code 12
Extension term 842
National classification 91/447
Total number of claims 12
Exemplary claims 1
Number of drawings 2
Number of figures 3
Terminal disclaimer
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