Shredding module used in a paper shredder

Details Shredding module used in a paper shredder Shredding module used in a paper shredder

1998-10-27

2001-01-02

Rosenbaum, Mark (Department: 3725)

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

C241S295000

Utility Patent

active

06168104

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a paper shredder, and more particularly, to a shredding module used in a paper shredder.
2. Description of the Prior Art
A typical paper shredder uses shredding modules to cut paper into thin strips. A shredding module comprises two parallel rotatable shafts rotatably installed inside a paper shredder with two sets of circular shredding knives separately installed on the two parallel rotatable shafts for cutting paper fed through them. A common index of shredding module cutting capability is the maximum number of paper sheets that can be fed and shredded. Shredding a large number of sheets of paper at the same time saves time for the user.
Please refer to
FIGS. 1
to
3
.
FIG. 1
is a perspective view of a prior art shredding module
24
.
FIG. 2
is a top view of the shredding knife
10
shown in FIG.
1
.
FIG. 3
is a sectional view along line
3
—
3
of the shredding knife
10
shown in FIG.
2
. The shredding module
24
comprises two parallel rotatable shafts
26
rotatably installed in a paper shredder (not shown) and two sets of circular shredding knives
10
installed separately on the two rotatable shafts. The shredding knives
10
are made by punching a thin metal plate with a punching die. The shredding knife
10
comprises a circular plate with a plurality of saw teeth
12
around its circular edge
14
, a circular recess
16
on the circular plate, and a mounting hole
18
positioned at the center of the circular plate for mounting the shredding knife
10
on one of the rotatable shafts.
The circular recess
16
of the shredding knife
10
comprises a convex side
20
and a concave side
22
.
FIG. 2
is a top view of the convex side
20
of the shredding knife
10
. The peripheral portion of the concave side
22
of each shredding knife
10
is rotatably engaged with the peripheral portion of the concave side
22
of a corresponding shredding knife
10
mounted on the other rotatable shafts for cutting the intervening paper. Unfortunately, this type of shredding knife
10
creates a lot of noise while cutting. Also, the cutting capability of the shredding module depends on the thickness of the circular edge so if the number of paper sheets fed into a shredding module is more than the maximum number it is capable of cutting, paper jamming occurs which causes problems in usage and cleaning.
SUMMARY OF THE INVENTION
It is therefore a primary objective of the present invention to provide a shredding module that can generate a given amount of driving power to cut more paper with less noise thus greatly increasing its cutting capability.
In a preferred embodiment, the present invention provides a shredding module comprising:
two parallel rotatable shafts rotatably installed in the paper shredder; and
two sets of circular shredding knives installed on the two rotatable shafts separately, each of the shredding knives being made by punching a thin metal plate using a punching die and comprising a circular plate with a plurality of saw teeth around its circular edge for cutting papers, a mounting hole positioned on the center of the circular plate for mounting the shredding knife to one of the rotatable shafts, and a circular recess on the circular plate over which the mounting hole is positioned at the center of the circular recess;
wherein the circular plate of each shredding knife comprises a convex side and a concave side and the concave side of the circular plate is in the same side with the concave side of the circular recess, the peripheral portion of the concave side of each shredding knife is rotatably engaged with the peripheral portion of the concave side of a corresponding shredding knife mounted on the other rotatable shaft for cutting papers passed in between, and wherein each of the shredding knives further comprises a sloping edge on the circular edge of the convex side of the circular plate for reducing the thickness of each of the saw teeth to sharpen the saw teeth.
It is an advantage of the present invention that the shredding module can simultaneously cut more paper with less noise with a given motor driving power. This benefit is derived from the fact that the saw teeth are thinner and thus sharper.
This and other objective of the present invention will no doubt become obvious to those of ordinary skill in the art reading the following detailed description of the preferred embodiment which is illustrated in the various figures and drawings.


REFERENCES:
patent: 5025994 (1991-06-01), Maitlen et al.
patent: 5048767 (1991-09-01), Mori
patent: 5292078 (1994-03-01), Lodovico et al.
patent: 5511732 (1996-04-01), Kroger et al.
patent: 5676321 (1997-10-01), Kroger

Affiliated with

Also associated with

Rating

Shredding module used in a paper shredder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Shredding module used in a paper shredder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shredding module used in a paper shredder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2457300