Cutlery – Cutting tools – Plural blade
Reexamination Certificate
2001-08-20
2003-07-01
Watts, Douglas D. (Department: 3724)
Cutlery
Cutting tools
Plural blade
Reexamination Certificate
active
06584694
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a cutting tool, and more particularly to a circular blade of the cutting tool.
2. Description of Related Art
As shown in
FIGS. 1
,
2
A, and
3
A, a prior art circular blade
11
of a cutting tool
10
is made integrally and is provided at the center thereof with a fastening hole
12
. The circular blade
11
is fastened to one end of a handle
16
by a fastening bolt
13
and a nut
15
. The fastening bolt
13
is engaged with the nut
15
via the fastening hole
12
of the circular blade
11
. The prior art circular blade
11
is defective in design in that it is susceptible to a minute deformation in the course of finishing process, and that its structural strength is inadequate. In addition, the prior art circular blade
11
does not work smoothly due to the mechanical friction between the circular blade
11
and other component parts of the cutting tool
10
.
As shown in
FIGS. 2B and 3B
, another prior art circular blade
40
is provided with a recess
401
, which is intended to alleviate the deformation that is caused in the finishing process. However, the working of this prior art circular blade
40
is hampered by the mechanical friction between the planar portion
402
of the circular blade
40
and other component parts of the cutting tool. In addition, the structural strength of the circular blade
40
is insufficient to meet the work requirement.
BRIEF SUMMARY OF THE INVENTION
It is the primary objective of the present invention to provide a circular blade which is free of the deficiencies of the prior art circular blades described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by the circular blade having a fastening hole, a reinforcing portion, and a cutting edge. The reinforcing portion serves to strengthen the structure of the circular blade, reduce the contact area between the circular blade and other component parts of the cutting tool, and prevent the deformation of the circular blade in the course of finishing process.
The foregoing objective, feature and function of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
REFERENCES:
patent: 430669 (1890-06-01), McDonald
patent: 2472876 (1949-06-01), Ahrndt et al.
Harrison & Egbert
Watts Douglas D.
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