Agitating – Rubber or heavy plastic working – With specified feed means
Reexamination Certificate
2000-08-11
2001-10-09
Cooley, Charles E. (Department: 1723)
Agitating
Rubber or heavy plastic working
With specified feed means
C366S191000, C406S117000
Reexamination Certificate
active
06299341
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is related to an improvement in the structure of a mixer for new and used plastic materials, and in particular to one which is low in cost and can operate flawlessly.
2. Description of the Prior Art
Referring to
FIG. 1
, the conventional mixer
1
for and new and used plastic materials includes a closed housing
10
formed with a new and used material inlets
11
and
12
at one side thereof, two pneumatic cylinders
13
and
14
arranged within the housing
10
, two pistons
15
and
16
respectively driven by the two pneumatic cylinders
13
and
14
for opening and closing the inlets
11
and
12
, and an outlet
17
arranged under the used material outlet
16
. The two pneumatic cylinders
13
and
14
are synchronously switched so that the pneumatic cylinder
13
will retract the piston
15
to open the new material inlet
11
while the pneumatic cylinder
14
will push the piston
16
to close the used material inlet
12
, and vice versa. Then, the mixed material will be sucked out of the housing
10
by a vacuuming device (not shown).
However, the conventional mixer must be operated by two pneumatic cylinders which are the most expensive components of the mixer thereby making it impossible to reduce the cost. In addition, if there is something wrong with the switching time of the two pneumatic cylinders
13
and
14
, the mixing proportion of the new and used materials will be changed thus influencing the properties of the product and therefore producing a lot of waste products.
Therefore, it is an object of the present invention to provide an improvement in the structure of a mixer for new and used plastic materials, which can obviate and mitigate the above-mentioned drawbacks.
SUMMARY OF THE INVENTION
This invention is related to an improvement in the structure of a mixer for new and used plastic materials.
It is the primary object of the present invention to provide an improvement in the structure of a mixer for new and used plastic materials which is low in cost.
It is another primary object of the present invention to provide an improvement in the structure of a mixer for new and used plastic materials which can operate flawlessly.
According to a preferred embodiment of the present invention, a mixer for new and used materials includes a closed housing having a bottom formed with an outlet in which is fitted an outlet pipe, a top formed with a first inlet in which is fitted a first inlet pipe, and a side formed with a second inlet in which is fitted a second inlet pipe, the first inlet pipe having an inclined lower end, a cylinder mounted on one side of the closed housing and located opposite to the second inlet pipe, the cylinder having a piston rod extending into the closed housing and connected with a block, the block having an inclined top configured to close the inclined lower end of the first inlet pipe, and a valve mounted on a top of the closed housing and operatively connected with the cylinder, whereby when in use, the valve is turned on to cause the piston rod of the cylinder to push the block against the second inlet pipe so that new (or used) material is fed into the closed housing through the first inlet pipe, and when a predetermined amount of new (or used) material has been fed into the closed housing, the control valve is switched to withdraw the piston rod of the cylinder thereby opening the second inlet pipe but closing the first inlet pipe by engaging the inclined top of the block with the inclined lower end of the first inlet pipe, so that used (or new) material is fed into the closed housing through the second inlet pipe, and therefore mixture of the new and used materials is sucked out of the closed housing through the outlet pipe.
The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
REFERENCES:
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patent: 3780991 (1973-12-01), Evans et al.
patent: 3871629 (1975-03-01), Hishida
patent: 3920229 (1975-11-01), Piggott
patent: 4060223 (1977-11-01), Bongartz et al.
patent: 4066245 (1978-01-01), Shultz
patent: 4108334 (1978-08-01), Moller
patent: 5110521 (1992-05-01), Moller
patent: 5148943 (1992-09-01), Moller
patent: 5213724 (1993-05-01), Saatkamp
patent: 5253994 (1993-10-01), Zweig et al.
patent: 5282548 (1994-02-01), Ishihara
patent: 5683632 (1997-11-01), Shimizu et al.
patent: 5772319 (1998-06-01), Pemberton et al.
A & J
Cooley Charles E.
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