Shredder which can shred small media

Details Shredder which can shred small media Shredder which can shred small media

2002-05-12

2004-01-27

Rosenbaum, Mark (Department: 3725)

Solid material comminution or disintegration

Apparatus

With automatic control

C241S100000, C241S236000

Reexamination Certificate

active

06682006

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a shredder. More specifically, the present invention discloses a shredder capable of shredding a little medium.
2. Description of the Prior Art
Please refer to
FIG. 1
a
and
FIG. 1
b.
FIG. 1
a
is a diagram of a prior art shredder
10
.
FIG. 1
b
is a diagram of a shredding device
18
of the prior art shredder
10
. The shredder
10
comprises a housing
12
, an entry slot
14
formed on the housing
12
for inserting a shredding paper
16
, a shredding device
18
installed inside the housing for shredding the paper
16
, and a trigger
20
installed on a central portion of the entry slot
14
for sensing the paper
16
and therefore starting the shredding device
18
. As shown in
FIG. 1
b,
the shredding device
18
comprises two shredding knives
22
,
24
, and a shredding gap
26
formed between the two shredding knives. When the paper
16
is inserted into the entry slot
14
, the paper
16
will push the trigger
20
so as to start the shredding device
18
. Then, the paper
16
will be pushed into the shredding gap
26
and therefore be shredded.
Please refer to FIG.
2
.
FIG. 2
is a diagram when the shredder
10
of
FIG. 1
a
is shredding a little medium. In general, if the shredding medium is a paper as shown in
FIG. 1
a,
the shredder
10
is always able to process it appropriately. However, if the shredding medium is a little object such as a credit card or compact disc, problems will arise. As shown in
FIG. 2
, a credit card
28
is inserted into the shredding gap
26
. Because the credit card
28
is thicker and harder than the paper
16
, the shredding knives
22
,
24
are easily deformed and become curved as shown in FIG.
2
. Therefore, after using several times, the shredding knives
22
,
24
will be elastically fatigued and be unable to provide enough force to shred items smoothly. When this happens, the shredding device
18
must be changed, which is not convenient.
Because of the problems mentioned above, the traditional shredder is seldom used to shred the little media. There are currently no shredders able to shred little media on the market. However, because of safety and secrecy, a shredder with the function of shredding little media such as credit cards and compact discs has significant value.
SUMMARY OF INVENTION
It is therefore a primary objective of the claimed invention to provide a shredder that is capable of shredding a little medium. The shredder has a side trigger installed in addition to the original trigger, which is installed on the central portion of the shredding gap. The little medium can be inserted into the portion of the shredding gap that is near an end of the shredding gap. Therefore, the shredding device is able to use the portion of the shredder having stronger mechanical strength to shred the little medium, overcoming the limitations of the prior art.
The claimed invention, briefly summarized, discloses a shredder, which comprises a housing, an entry slot on the housing for inserting a desired medium, a shredding device installed inside the housing for shredding the medium, and a central trigger for sensing the medium and therefore triggering the shredding device. The shredding device comprises two shredding knives, and a shredding gap between the two shredding knives. The central trigger is installed above the central portion of the shredding gap. The shredder further comprises a side trigger installed between the central portion and an end of the shredding gap. When a medium with its size longer than half a length of the shredding gap is inserted into the entry slot, the medium will trigger the central trigger device and therefore trigger the shredding device. However, when a medium with its size shorter than half the length of the shredding gap is inserted into the entry slot, the medium is capable of triggering only the side trigger and not the central trigger and therefore triggers the shredding device.
It is an advantage of the claimed invention that the claimed invention comprises a side trigger so that the shredder is able to use the two end portions of the shredding gap to shred the little medium. The mechanical structure of the two end portions of the shredding gap is stronger than the central portion, so that the shredding knives will not be easily deformed and become curvy and will not be elastically fatigued. Therefore, the life of the shredder will be lengthened.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment which is illustrated in the various figures and drawings.


REFERENCES:
patent: 5984215 (1999-11-01), Huang
patent: 6308904 (2001-10-01), Chang
patent: 6550701 (2003-04-01), Chang
patent: 0 281 136 (1988-09-01), None

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