Machine for collecting, shredding and compacting cans

Machine to draw metal (especially aluminum) cans by suction into a housing by a vacuum fan. A hose may be used to pick up cans from the ground or cans may be fed manually into the intake of the housing. The intake is at the top of the housing and in registry therewith is a vertical cylinder of expanded metal or machined from high-impact plastic, which directs the cans down through a conical hopper of high-impact plastic. Small foreign particles pass through the vertical cylinder and hopper and drop to the bottom of the housing. These particles may be collected from the housing from time to time. Dust and very small particles are drawn through the vacuum fan and collected in a filter bag. Large particles such as cans are directed from the hopper to a chute where they are shredded by revolving blades and pass into a compactor housing where they are compressed for salvage.

This invention relates to a new machine for collecting, shredding and 
compacting metal cans, especially aluminum cans. The littering of the 
landscape by discarded metal cans, especially beverage cans, is a present 
day important ecological problem. Aluminum cans are not biodegradable and 
hence are a particularly serious problem. On the other hand, the salvage 
value of aluminum cans is high as compared with steel cans and the salvage 
value is greater if the aluminum cans are shredded and compressed. It 
takes only 5% (five percent) the energy to make a new aluminum can from 
reclaimed, recycled, aluminum as it does to make the same can from ore, 
and ore is expensive compared with salvage metal. Thus, a two-way cost 
savings results: (a) energy savings; (b) material savings. The present 
invention provides a means for collecting cans which have been discarded 
and for enhancing their salvage value. 
At the present time, discarded cans are frequently deposited in trash cans 
and then dumped into land-fill dumps. Considerable trash and dump space is 
devoted to this purpose, space which is saved in accordance with the 
present invention. Large quantities of cans are deposited in homeowners' 
trash cans. The elimination of such deposit cuts homeowners' garbage bills 
and makes available more space for biodegradable items. 
The present invention has particular value in cleaning out metal cans and 
other objects of similar nature from locations where they tend to collect 
in large numbers. Although there are many others, typical installations 
are in athletic stadia, the edges of fields where agricultural workers are 
employed, parking lots, certain roadsides, the trash collection areas of 
apartment houses, etc. Use of the machine in accordance with the present 
invention either mounted on a vehicle where it is possible to move the 
machine to locations where the trash tends to collect or stationarily 
mounted where consumers can deposit the cans from time to time is 
particularly advantageous. 
Another feature of the invention is the provision of means in the machine 
to separate the metal from dust and other debris. The dust is filtered in 
a filter bag. The small parts drop from the mass of metal through grating 
and the metal, primarily cans, is handled separately from the other 
materials. It is desirable to handle the aluminum cans separate from other 
metal containers and for such purpose magnets may be mounted in the 
collecting head or at other locations in the machine to attract the steel 
containers and separate them from the aluminum. The present invention is 
particularly suitable for this purpose. 
In order to enhance the salvage value of aluminum cans, it is necessary 
that they be compacted. Purchasers of the scrap cans prefer that the cans 
be shredded rather than merely being collapsed because further processing 
is facilitated. In accordance with the present invention, the cans are not 
only shredded but also are compacted to considerably reduce bulk. 
By salvaging some or all of the metal collected by the machine, the cost of 
the machine is paid off and the labor required to operate it is 
compensated. 
Steel (i.e. "tin") cans and glass containers may be handled in accordance 
with the present invention although it is desirable to eliminate the step 
of shredding such material by removing the shredder blades. Otherwise, the 
blades may be damaged because of the hardness of the steel or glass. Wood 
particles, such as branches, may be collected by use of the machine, and 
fed manually, shredded and shredded particles compressed. Some of the 
items mentioned herein may best be deposited directly in the housing 
rather than in the collector nozzle. 
Accordingly, the present invention provides a versatile machine which is 
capable of handling a variety of different types of scrap and delivering 
the same in an economically useful form while at the same time cleaning 
the landscape of unsightly debris.

The machine hereinafter described is preferably mounted on a horizontal 
base 10 which may in turn be mounted on a vehicle (not shown) if the 
machine is to be transported into locations where cans tend to collect. If 
vehicle mounted, the motor which drives the parts hereinafter described 
may be energized either from the electrical system of the vehicle or a 
generator may be mounted on the vehicle; or alternatively, power take-off 
from the mechanical drive of the vehicle may be connected by means (not 
shown) to drive the components of the machine, eliminating the motors. 
Mounted vertically on base 10 is a housing 11 which is here shown as 
generally cylindrical in shape. A flat top 12 closes off the top of 
housing 11 and a downward-inward slanted intake duct 13 extends through 
the top 12. The outer end of duct 13 may be attached to a elongated 
flexible hose 14 which is large enough to handle cans and other debris 
being collected. Optionally, at the outer end of hose 14 is a nozzle 16 
shaped to pick up the debris. Although not shown, it will be understood 
that magnets 15 may be positioned in nozzle 16 to stop passage of 
magnetizeable material. This is particularly desirable when the machine is 
used to pick up a pile of cans which are mixed aluminum and steel. By 
separating out the steel cans and separately handling them, only the 
aluminum cans can be compacted and hence the necessity of segregating the 
scrap is eliminated. 
Extending downward inside top 12 and in registry with intake duct 13 is a 
short cylindrical section 17 of expanded metal. The lower end of cylinder 
17 discharges into a downwardly-sidewardly slanted conical hopper 18 also 
preferably formed of expanded metal. The openings in the members 17 and 18 
is such that small particles of metal, stone and the like drop to the 
bottom of hopper 18 and are thus separated from the metal can. The hopper 
18 discharges into a downward slanted preferably metal or metal-lined 
plastic chute 19 which extends out the side of the housing 11 into a 
shredder housing 21. Rotatable within shredder 21 is a rotor 22 formed of 
a plurality of large tooth saw blades 23 mounted on the horizontal shaft 
of motor 24. The gap between the blades 23 and the bottom of chute 19 is 
sufficiently large so that the metal cans are shredded as they pass under 
the shredder rotor 22. 
Mounted on the top 12 is a vacuum fan 26. The intake of fan 26 employs a 
solid sheet metal cylinder 27 which directs dust and other very fine 
particles up into the fan 26 and out duct 28 which handles the discharge 
of fan 26. A suitable motor (not shown) mounted within the fan housing 26 
drives the fan. Where considerable amounts of dust are being drawn into 
the machine, a dust filter bag 29 may be attached to the outlet of duct 
28. Thus the very fine particles drawn in through intake 13 are discharged 
through duct 28 and may be collected in bag 29. 
The shredded material discharged from shredder 21 is preferably compressed. 
As shown in FIGS. 1 and 2, mounted adjacent shredder 21 is a compactor 
housing 31, preferably verticaly disposed and having an intake opening 41 
positioned to receive the discharge of shredder 21. Vertically 
reciprocable within cylinder 31 is a ram plate 32 which is driven by a 
vertically mounted hydraulic cylinder 33 on the top of the compactor. A 
power pack 34 consisting of a cylinder and a means for driving the 
hydraulic fluid is connected to the cylinder 33. 
A clean-out opening 36 for the compactor and another cleanout opening 37 
for the housing 11 are provided. 
Where steel cans or glass containers are being handled, it is undesirable 
that they be shredded since the blades 23 will be damaged. Thus the 
shredder blades may be removed from the rotor 22 and the motor 24 not 
energized when such material is passing through the machine. Even pieces 
of wood such as small lengths of two-by-four may be shredded by the 
machine. It is desirable, of course, to segregate the different types of 
material prior to their entry into the machine so that the material 
removed is all of the same composition. 
In use, therefore, selected material is drawn into duct 13 either using the 
hose 14, and optionally the nozzle 16 to pick up the debris from the 
ground such as parking lots, roadsides, etc.; or if the machine is 
stationarily mounted, the hose 14 may be eliminated and cans inserted 
manually into the duct 13. The fan 26 draws the material up through nozzle 
16, hose 14 and duct 13, the draft of the fan being sufficient to lift 
this lightweight material. Within the housing 11 the very small dust 
particles and the like are drawn up through the fan 26 and discharged 
through duct 28; and, if in sufficient volume, collected in filter bag 29. 
The intermediate particles such as the lift tops of cans drop through the 
openings in the gratings 17 and 18 and fall to the bottom of the housing 
11. They may be cleaned out periodically through the opening 37 and 
separately salvaged. Aluminum cans enter through duct 13, pass down 
through cylinder 17 and fall into the hopper 18 where they are conveyed 
downwardly into the chute 19 and pass under the shredder blades 23. The 
blades 23 shred the cans into considerably smaller size and they are 
discharged through opening 41 into the compactor housing 31. It is, of 
course, necessary that the ram plate 32 be elevated to upper position 
while the shredding operation is being conducted. When a considerable 
amount of debris has collected within the compactor housing 31, the fan 26 
and shredder motor 24 are stopped. Thereupon, the power pack 34 causes the 
ram 33 to drive the plate 32 downwardly compressing the shredded cans in 
the bottom of the compactor housing 31. The compressed material may be 
removed from time to time through clean-out 36.