Earth working – Lawn aerator or perforator – or plug remover
Reexamination Certificate
2002-05-21
2004-12-21
Will, Thomas B. (Department: 3671)
Earth working
Lawn aerator or perforator, or plug remover
C172S247000, C172S540000
Reexamination Certificate
active
06832657
ABSTRACT:
BACKGROUND AND SUMMARY OF THE INVENTION
Zero-turn riding lawn mowers are popular because they can maneuver in very tight areas. Aerators are devices having soil-penetrating tines that, in some cases, are mounted on the front of mechanized lawn equipment. Usually the penetration depth of the aerator tines is determined by adding a weight on the aerator frame. However, as far as I know, no lightweight aerator attachment can be readily mounted on the front of certain zero-turn riding mowers in which the weight of the mower is used to apply down pressure on the aerator tines.
Prior art illustrating aerators mounted on the front of mechanized lawn equipment may be found in U.S. Pat. No. 3,570,604 issued Mar. 16, 1971 to Patrick Leo Allard et al. for “Soil Penetrating Implements”; U.S. Pat. No. 6,241,025 issued Jun. 5, 2001 to James W. Myers et al. for “Aerator”; U.S. Pat. No. 5,398,768 issued Mar. 21, 1995 to Clarke H. Staples for “Aerator” and U.S. Pat. No. 4,158,391 issued Jun. 19, 1979 to Boyd D. Clements for “Soil Aerating Device”.
The broad purpose of the present invention is to provide a lightweight aerator attachment that can be mounted on a zero-turn lawn mower to apply the weight of the mower as a downward pressure on the aerator tines. One advantage of the preferred embodiment, which will be described in greater detail, permits a lightweight aerator attachment to be quickly attached to commercially available, zero-turn lawn mowers.
Another advantage is that the attachment permits the operator to adjust the penetration depth of the aerator tines into the ground by using the weight of the lawnmower.
Another object of the invention is to provide an aerator attachment having a linear actuator for raising and lowering the aerator drum, the actuator being entirely mounted on the aerator structure.
Still further objects and advantages of the invention will become readily apparent to those skilled in the art to which the invention pertains upon reference to the following detailed description.
REFERENCES:
patent: 3570604 (1971-03-01), Allard
patent: 4424868 (1984-01-01), Staniforth et al.
patent: 4516638 (1985-05-01), Hicks et al.
patent: 4910948 (1990-03-01), Nelson
patent: 5101910 (1992-04-01), Dawson
patent: 5353724 (1994-10-01), Wheeley, Jr.
patent: 5398768 (1995-03-01), Staples
patent: 5623996 (1997-04-01), Postema
patent: 5806293 (1998-09-01), Klein et al.
patent: 5823269 (1998-10-01), Leclerc
patent: 6241025 (2001-06-01), Myers et al.
patent: 6415872 (2002-07-01), Myers et al.
Chandler Charles W.
Mammen Nathan
Will Thomas B.
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