Excavating – Ditcher – Condition responsive
Reexamination Certificate
2006-07-04
2006-07-04
Beach, Thomas A. (Department: 3671)
Excavating
Ditcher
Condition responsive
C060S422000, C091S516000
Reexamination Certificate
active
07069674
ABSTRACT:
A hydraulic circuit for use with a backhoe includes first, second and third pumps; left and right traveling unit valve sections-receiving pressure oil from the first and second pumps independently of each other; a front implement valve section receiving combined pressure oil including oil from respective center oil passages of the left and right traveling unit valve sections; and a swiveling valve section receiving pressure oil from the third pump. A parallel oil passage having a restrictor extends parallel to a center oil passage of the swiveling valve section. The front implement valve section also receives pressure oil from the center oil passage of the swiveling valve section and the parallel oil passage. A load sensing system controls flow amounts of the first and second pumps according to a hydraulic load generated in a front implement operation.
REFERENCES:
patent: 4559965 (1985-12-01), Mickelson
patent: 4663936 (1987-05-01), Morgan
patent: 5722190 (1998-03-01), Arnold
patent: 5784945 (1998-07-01), Krone et al.
patent: 6029445 (2000-02-01), Lech
patent: 6173573 (2001-01-01), Kamada
patent: 6502499 (2003-01-01), Sannomiya et al.
patent: 6584770 (2003-07-01), Tsuruga et al.
patent: 2003/0089106 (2003-05-01), Ioku et al.
patent: 0 393 342 (1990-10-01), None
patent: 819 795 (1998-01-01), None
patent: 01-223276 (1989-09-01), None
patent: 2001-050209 (2001-02-01), None
patent: 2001-355257 (2001-12-01), None
patent: 2002-206256 (2002-07-01), None
Beach Thomas A.
Kubota Corporation
The Webb Law Firm
LandOfFree
Hydraulic circuit for backhoe does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic circuit for backhoe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic circuit for backhoe will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3580010