Mining or in situ disintegration of hard material – Hard material disintegrating machines – Floor-working
Reexamination Certificate
1998-09-02
2001-05-08
Bagnell, David (Department: 3673)
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Floor-working
C299S039200, C299S039600, C299S039500, C125S013030, C404S086000, C451S236000
Reexamination Certificate
active
06227620
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a forward mounted asphalt road mill apparatus for attachment to and use in conjunction with a front-end loading land vehicle or the like having a loading bucket or other lifting mechanism. The preferred road mill apparatus includes a road mill housing and a mounting device for multiple tool attachment. The preferred mounting device includes a cylindrical shaft upon which a working machine, such as the road mill housing, may be secured. the present invention also includes a mounting device of the type described above.
Road surfaces, particularly asphalt road surfaces form a majority of road surfaces in the United States. Asphalt is also used in other applications, such as parking lots, biking paths, walking paths and the like. A problem with asphalt is that is has a limited useful life. When that useful life has been exceeded, the surface must be replaced or rehabilitated. The conventional units generally used to replace such surfaces are generally large machines capable only of replacing the entire surface area. Often, however, it is not desirable or cost effective to rehabilitate the entire road surface, particularly when only portions or segments of a paved section have deteriorated. As a result, the road surface is allowed to continue to deteriorate until use of a conventional full surface surfacing unit becomes cost effective. The need to wait until the use of conventional resurfacing units becomes cost effective, results in temporary repairs such as patching, which are not as desirable as resurfacing. However, without a more cost effective manner resurfacing small areas, or portions of larger areas, resurfacing which might otherwise be completed if smaller, more flexible resurfacing units were available, will be deferred. Furthermore, there will be a tendency to redo surfaces which might not need to be done because only larger areas can be accommodated by the larger conventional units. Conventional units tend to be very large and heavy. They are often self propelled or attached to existing vehicle frames. The power for such units is generally supplied by one unit which means that some of the power is used to drive the vehicle and some of the power is used in the surface treatment apparatus. For this reason, those units are also very slow. In addition, they can only be used to resurface large areas. It will be appreciated, therefore, that a need exists for smaller devices which are easily transportable, efficient for reconditioning or replacing portions of larger asphalt surface areas, and flexible in terms of the types of replacements which can be done.
Smaller pavement milling apparatus have been previously disclosed. Fowkes (U.S. Pat. No. 3,608,969) discloses a pavement milling apparatus having a frame, a manual cutting head with cutting teeth, an internal combustion engine power plant, a power transmitting mechanism, a torque amplifying mechanism, an adjustable gage, a cover. Taylor et al. (U.S. Pat. No. 4,704,045) discloses an apparatus for pulverizing asphalt including a rotating drum with removable cutting tips which engage the roadway. The apparatus is designed for receiving and rotating varies widths of rotating drums and is adaptable for moving the drum along the width of a mobile piece of equipment supporting the apparatus and adjacent a curb and gutter of a roadway. Numerous other patents, notably Guest (U.S. Pat. No. 3,864,793); King (U.S. Pat. No. 4,411,081); Baskett U.S. Pat. No. 5,060,732); Hackmack (U.S. Pat. No. 4,803,789); and Maxwell et al. (U.S. Pat. No. 5,388,893), disclose mechanism for attaching working machines to loading buckets on front-end loaders. Several of these patents disclose rotating drums and, of those, Hackmack and Maxwell et al. disclose rotating milling devices for pulverizing soil and the like.
Accordingly, it will be appreciated that there is a need for an efficient way to attach a asphalt road milling device to a loading bucket of a front-end loader so that such a device may be efficiently used to resurface asphalt, concrete in other surfaces used for roadways, walkways, parking lots and the like. The present invention provides advantages over the prior devices and the prior methods used to resurface these and other surfaces and will also offer advantages over the prior art and solve other problems associated therewith.
SUMMARY OF THE INVENTION
The forward mounted asphalt road mill apparatus of the present invention is compact, easily transportable and includes a surface treatment unit which has a cutter drum powered by its own power source. The apparatus includes a road mill housing having a rotatable cutter drum and a mechanism for driving the cutter drum; and a mounting device for attaching the road mill housing to a lifting mechanism attached to a land vehicle, preferably a loading bucket of a front-end loader or the like. The housing is easily transportable in a pickup truck or the like. The mounting device for attachment of the road mill housing to a land vehicle includes a cylindrical shaft upon which the housing may be secured, and the housing includes a shaft receiving opening for receiving the cylindrical shaft. Preferably, the road mill apparatus of the present invention further comprises an adjustable length connecting arm interconnecting the housing to the mounting device. The connecting arm is preferably oriented such that the housing will pivot about the cylindrical shaft with respect to the mounting device when the length of the connecting arm is changed. The connecting arm is preferably a hydraulic cylinder which is actuated remotely from the cab of the front-end loader or other prime mover having a forwardly mounted lifting mechanism. Preferred embodiments of the mounting device will be designed and constructed to engage a standard attachment mechanism such as a “quick attach” mechanism, a loading bucket, or the like.
The surface preparation apparatus of the present invention is compact, easily transportable, and includes a surface treatment unit which has a surface modifier or “cutter drum” powered by its own power source. The surface modifier or cutter drum is preferably off-set relative to the transverse aids of the surface treatment unit such that the surface modifier operates substantially to one side of the surface treatment unit.
One objective of the present invention is to provide a surface preparation apparatus which may be easily transported in or on vehicle or attached to a lifting mechanism of a vehicle.
Another objective is to create a compact surface preparation apparatus which is useful to efficiently recondition small sections of deteriorated asphalt surfaces.
A further objective is to rehabilitate surfaces of various widths and compositions.
Another objective is to reduce the potential of injury due to flying debris.
Another object is to provide an apparatus which will move the debris from the treated surface area.
These and various other advantages and features of novelty that characterize the present invention are pointed out with particularity in the claims annexed hereto informing a part hereof. However, for a better understanding of the present invention, its advantages and other objects obtained by its use, reference should be made to the drawings, which form a further part hereof and to the accompanying descriptive matter, in which there is illustrated and described preferred embodiments of the present invention.
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patent: 4411081 (1983-10-01), King
patent: 4704045 (1987-11-01), Taylor et al.
patent: 4803789 (1989-02-01), Hackmack
patent: 4878713 (1989-11-01), Zanetis
patent: 5060732 (1991-10-01), Baskett
patent: 5236278 (1993-08-01), Dickson
patent: 5378080 (1995-01-01), Dickson
patent: 5378081 (1995-01-01), Swisher, Jr.
patent: 5388893 (1995-02-01), Maxwell et al.
patent: 5421669 (1995-06-01), Bertrand
patent: 5850704 (1998-12-01), Harinen
patent: 5893677 (1999-04-01), Haehn et al.
patent: 6116699 (2000-09-01), Kaczmarski et al.
patent:
Bagnell David
Moore & Hansen
Singh Sunil
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