Earth working – With ground support vertically adjustable relative to frame
Reexamination Certificate
2005-11-14
2008-07-22
Hartmann, Gary S (Department: 3671)
Earth working
With ground support vertically adjustable relative to frame
C172S452000, C172S684500, C172S734000, C172S764000
Reexamination Certificate
active
07401657
ABSTRACT:
A ground scraper designed to be pulled by a tractor or the like includes a pair of parallel frame rails with a scraper blade between them and perpendicular to them. The scraper blade can lowered to a preferred depth of scraping and can be raised above the bottom of the frame for towing. Dual-wheeled trucks on the rear of the frame can be raised off the ground to allow the frame to contact the ground for scraping and can be lowered into contact with the ground, also raising the frame off the ground, for towing on roads or the like. The rear of a tongue can be raised relative to the front of the tongue to pick up the front of the ground scraper frame for transporting the ground scraper and then the rear of the tongue can be lowered relative to the front of the tongue, allowing the frame to contact the ground. The exact angle of the tongue can float up and down in order to allow towing on uneven terrain.
REFERENCES:
patent: 1388809 (1921-08-01), Edginton
patent: 3409120 (1968-11-01), Van Huis
patent: 3458029 (1969-07-01), Allen et al.
patent: 3845517 (1974-11-01), Harris
patent: 3912016 (1975-10-01), Arrnold
patent: 4044843 (1977-08-01), Holub
patent: 4189009 (1980-02-01), Welch
patent: 4383380 (1983-05-01), Miskin
patent: 4388769 (1983-06-01), Miskin
patent: 4389800 (1983-06-01), Goby
patent: 4711403 (1987-12-01), Gregory, Sr. et al.
patent: 5143160 (1992-09-01), May
patent: 5297745 (1994-03-01), Vinyard
patent: 5423394 (1995-06-01), Kendle
patent: 5901911 (1999-05-01), Davis
patent: 6041528 (2000-03-01), Broach
patent: 6098320 (2000-08-01), Wass
patent: 6347670 (2002-02-01), Miskin
patent: 6442921 (2002-09-01), Feeley
patent: 6446298 (2002-09-01), Berg, Jr. et al.
patent: 6540435 (2003-04-01), Lizarraga
patent: 7063166 (2006-06-01), Grosberg
patent: 7117953 (2006-10-01), Moyna
patent: 2002/0133899 (2002-09-01), Van den Berg
patent: 2005/0150668 (2005-07-01), Williamson
Hartmann Gary S
Iles Kenneth W.
LandOfFree
Ground scraper does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ground scraper, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ground scraper will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3972917