Blade of paper shredder

Details Blade of paper shredder Blade of paper shredder

2000-04-05

2002-05-21

Rosenbaum, Mark (Department: 3725)

Solid material comminution or disintegration

Apparatus

Comminuting elements

Reexamination Certificate

active

06390400

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a paper shredder, and more particularly to an improved blade of the paper shredder.
BACKGROUND OF THE INVENTION
As illustrated in
FIG. 1
, a prior art blade
80
of the paper shredder is provided in the outer periphery thereof with three arcuate portions
82
,
83
, and
84
, which are formed by punching so as to form three teeth
85
. The blade
80
is made of a round metal piece
81
. The prior art blade
80
is used in conjunction with a spiral rod
89
, as shown in FIG.
2
. The blades
80
are spirally arranged on the spiral rod
89
to enhance the shredding effect of the paper shredder. The prior art blade
80
can not be processed easily and is apt to become dull.
As shown in
FIG. 3
, another prior art blade
90
of the paper shredder is relatively cost-effective in view of the relatively small punched area
91
and the relatively large area of blade edge
92
. In addition, the prior art blade
90
is less likely to become dull. However, the prior art blade
90
is defective in design in that the blade edges
92
thereof are smooth, thereby undermining the shredding effect of the prior art blade
90
. In other words, the paper is apt to slide along the smooth surface of the blade edge
92
. The blade edge
92
of the prior art blade
90
is devoid of means to arrest the paper to be shredded.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a paper shredder with a blade which is free from the drawbacks of the prior art blades described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a blade having a thin round body which is provided in the center thereof with a through hole and in the periphery thereof with at least one notch, thereby resulting in the formation of at least one blade edge. The blade is provide with a rugged peripheral surface.


REFERENCES:
patent: 4009838 (1977-03-01), Tashman
patent: 4061278 (1977-12-01), Ehinger
patent: 5141168 (1992-08-01), Pepper
patent: 5676321 (1997-10-01), Kroger

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