Excavating – Snow or ice removing or grooming by portable device – Motorized rotary excavating tool
Reexamination Certificate
1999-05-10
2001-03-13
Pezzuto, Robert E. (Department: 3671)
Excavating
Snow or ice removing or grooming by portable device
Motorized rotary excavating tool
Reexamination Certificate
active
06199306
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention concerns machines which remove deep snow from roadways, driveways, etc. by conveying the snow to an impeller which throws the snow some distance from the machine, either to be collected for transport or into a pile some distance from the roadway.
A common arrangement is the combination of a rotating auger-screw conveyor the front of the machine which feeds snow into a separate central impeller.
This arrangement consumes considerable power since it pulverizes the snow, grinding it into a powder. The auger is also used to break up packed snow, which it does but quite-inefficiently as it utilizes a scraping action to accomplish this.
The impeller also consumes considerable power in throwing the snow in the finely powered condition in which it is received by the impeller from the auger.
These inefficiencies require high horsepower engines, which result in heavy and costly machines.
It is the object of the present invention to provide a combination of elements which efficiently breaks up the snow and propels the same away in such a manner that only a considerably reduced horsepower is required for a given application.
SUMMARY OF THE INVENTION
The above recited object and others which will become apparent upon a reading of the following specification and claims are achieved by providing an arrangement of elements which act primarily to cut up by splitting the compacted snow or other material rather than to break up the snow by the grinding and scraping action heretofore relied on.
Specifically, one or more arrays of rotating cutter assemblies (bars are shown in this example) are located just forward of a rotating auger-cutter member. The cutters comprise a series of bars each having a blade end extending generally axially but angled slightly to create a slicing and pulling action when driven by the rotation of a mounting shaft.
The auger-cutter member includes a rotating cylindrical shaft or tubular mounting extending on an axis that will contribute to the desired action and to the rear of the cutter bar shaft, a pair of opposite helically wound conveying strip segments projecting from the surface of the auger. An axially extending cutter edge is formed along each radial strip, angled slightly to create a slicing, gathering action and confining the cut material to effectively impart kinetic energy to the conveyed chunks of material to assist in the throwing action.
The oppositely helically wound strip segments meet at the auger center where an impeller pocket is formed by the joined strip ends.
A wedge shaped shield deflector is disposed forward of the center where the impeller pocket is located to move the material to the sides and into the adjacent cutter bars and auger cutter strips for cutting and conveyance to the impeller pocket.
The packed material is efficiently cut into chunks rather than being pulverized by the cutter arms and auger edge. The cut up material is conveyed into the impeller pocket at sufficient velocity as to contribute to the throwing action imparted by the impeller itself.
REFERENCES:
patent: 301506 (1884-07-01), Massey
patent: 2166667 (1939-07-01), Watkins
patent: 2337108 (1943-12-01), Jensen
patent: 2482213 (1949-09-01), Ritchie
patent: 2736111 (1956-02-01), Moen
patent: 2777217 (1957-01-01), Klauer
patent: 3276571 (1966-10-01), Vohl
patent: 3340626 (1967-09-01), Konucik
patent: 3999316 (1976-12-01), Palmer
patent: 5398432 (1995-03-01), Vohl
Kauppila Raymond W.
Kauppila Richard W.
Benefiel John R.
Kauppila Richard W.
Pezzuto Robert E.
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