Information
-
Patent Grant
-
6584694
-
Patent Number
6,584,694
-
Date Filed
Monday, August 20, 200123 years ago
-
Date Issued
Tuesday, July 1, 200321 years ago
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Inventors
-
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 032 307
- 032 319
- 032 16495
- D07 694
- 030 276
- 030 347
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International Classifications
-
Abstract
A circular blade of the cutting tool is provided with a reinforcing portion circumventing a fastening hole by which the circular blade is fastened to one end of the handle of the cutting tool. The reinforcing portion serves to enhance the structural strength of the circular blade, and to reduce the mechanical friction between the circular blade and the one end of the handle of the cutting tool. The reinforcing portion also serves to eliminate the internal stress of the circular blade at the time when the circular blade is subjected to a finishing process.
Description
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.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
FIG. 1
shows an exploded view of a cutting tool of the prior art.
FIG. 2A
shows a sectional view of a circular blade of the prior art cutting tool as shown in FIG.
1
.
FIG. 2B
shows a sectional view of another prior art circular blade.
FIG. 3A
shows a perspective view of the prior art circular blade as shown in FIG.
2
A.
FIG. 3B
shows a perspective view of the prior art circular blade as shown in FIG.
2
B.
FIG. 4
shows a perspective view of a circular blade of the present invention.
FIG. 5
shows an exploded view of a cutting tool comprising the circular blade of the present invention as shown in FIG.
4
.
FIG. 6
shows a sectional view of the circular blade of the present invention and other component parts of the cutting tool as shown in FIG.
5
.
FIG. 7
shows a sectional view of the circular blade of the present invention.
FIGS. 8A
,
8
B,
8
C, and
8
D are schematic views to show that the circular blade of the present invention has a regularly-serrated cutting edge or an irregularly-serrated cutting edge.
DETAILED DESCRIPTION OF THE INVENTION
As shown in
FIGS. 4-7
, a circular blade
20
of the present invention is provided in the center with a fastening hole
21
to facilitate the fastening of the circular blade
20
to one end of a cutting tool handle
31
by a locating element
30
and a nut
33
, as illustrated in FIG.
5
.
The circular blade
20
of the present invention is further provided with a reinforcing portion
22
having a predetermined width and thickness. In other words, the reinforcing portion
22
is raised from the surface of one side of the circular blade
20
such that the reinforcing portion
22
circumvents the fastening hole
21
.
The circular blade
20
of the present invention has a cutting edge
23
, which is regularly serrated, or irregularly serrated, as illustrated in
FIGS. 8A-8D
.
The reinforcing portion
22
serves to strengthen the structure of the circular blade
20
of the present invention, and to prevent the deformation of the circular blade
20
in the finishing process. When the circular
20
is being finished, the reinforcing portion
22
serves to eliminate the metal internal stress, thereby preventing the deformation of the circular blade
20
.
As shown in
FIG. 6
, the reinforcing portion
22
serves to reduce the contact area between the circular blade
20
of the present invention and the cutting tool handle
31
to which the circular blade
20
is fastened by the locating element
30
in conjunction with the nut
33
.
The present invention described above is to be regarded in all respects as being merely illustrative, and not restrictive. Accordingly, the present invention may be embodied in other specific forms without deviating from the spirit thereof. The present invention is therefore to be limited only by the scope of the following claim.
Claims
- 1. A cutting apparatus comprising:a circular blade having a cutting edge at a periphery thereof, said circular blade having a fastening hole formed in a center thereof, said circular blade having an annular reinforcing protrusion formed therein and extending outwardly from a plane of one side of said blade, said annular reinforcing protrusion being entirely radially spaced from and extending around said fastening hole, said protrusion located between said cutting edge and said fastening hole, said circular blade having an annular indentation formed on an opposite side of said blade corresponding in location entirely with said annular reinforcing protrusion; a cutting tool having a single planar receptacle surface and a handle extending outwardly therefrom, said annular reinforcing protrusion having an outer surface juxtaposed against a planar receptacle surface, said receptacle surface having a hole formed therein, said opposite said of said circular blade being exposed on a side of said cutting tool opposite said planar receptacle surface; a locating element extending through said fastening hole of said blade and said hole of said receptacle surface; and a nut secured to an end of said locating element such that said blade is retained against said receptacle surface.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
430669 |
McDonald |
Jun 1890 |
A |
2472876 |
Ahrndt et al. |
Jun 1949 |
A |