Harvesters – Motorized harvester – Having motor on ground-supported carrier
Reexamination Certificate
1997-12-12
2002-10-29
Will, Thomas B. (Department: 3671)
Harvesters
Motorized harvester
Having motor on ground-supported carrier
C056S255000, C056S295000
Reexamination Certificate
active
06470661
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a mowing blade using an asymmetrical star for a power passing interconnection with a rotating blade spindle.
BACKGROUND OF THE INVENTION
For many years, lawn mower blades were simply bolted on to the bottom of a rotating shaft. As the blades themselves were a little more than straight pieces of sharpened stamped steel, and as all of the forces on the blade were unidirectional, this method of interconnection worked quite well.
When the requirements for passing torque between the blade and shaft became bidirectional, as with the addition of a blade brake to the interconnection, and as the blades themselves began to require greater torque, for example mulching blades having integral fans and recutting sections, the simple bolt no longer sufficed. Manufacturers, therefore, adapted any one of many varying techniques in order to physically connect the blade normally to some sort of adapter between the blade and the shaft. These included adapters having pins spaced from the rotational axis of the shaft as well as star shaped holes in the blade with corresponding keys on the shaft.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide for a reliable means of passing bidirectional torque between a blade and a shaft.
It is another object of the present invention to increase the longevity of the interconnection between a blade and shaft.
It is yet another object of the present invention to reduce the cost of an interconnection between a blade and shaft.
It is still another object of the present invention to reduce the complexity of the interconnection between a blade and a shaft.
Is is a further object of the present invention to simplify the manufacture of an interconnection between a blade and a shaft.
Other objects and a more complete understanding of the invention may be had by referring to the following description and drawings in which:
REFERENCES:
patent: 3564824 (1971-02-01), Tygh, Jr.
patent: 3910017 (1975-10-01), Thorud et al.
patent: 4936884 (1990-06-01), Campbell
patent: 5284006 (1994-02-01), Sheldon
patent: 5502958 (1996-04-01), Plamper
patent: 5724796 (1998-03-01), Plamper
Emerson Roger D.
Emerson & Skeriotis
MTD Products Inc
Petravick Meredith C.
Skeriotis John M.
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