Solid material comminution or disintegration – Apparatus – With separation or classification of material
Patent
1990-01-08
1991-11-12
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
With separation or classification of material
2411017, 2411864, 241190, B02C 1304, B02C 13286
Patent
active
050641263
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a shredder for shredding waste paper, cardboard, packaging materials and other sheet media such as microfilm and microfiche. The construction is particularly adapted for large scale bulk industrial use, and may be transported for on-site use.
PRIOR ART
Shredders for small scale use are already known and these generally comprise two sets of intermeshed counterrotating wheels, into the nip of which the sheet of paper to be shredded is fed. Such shredders are generally able to cope with a single sheet or at the most a small number of sheets of paper at one time. Moreover, such shredders often have problems in dealing with staples, paper clips, and other metal commonly associated with documents. Such a construction is quite unable to cope when there are large amounts (for example, tonnes) of waste material to be shredded.
A number of shredders are known from prior art patent specifications. U.S. Pat. No. 3 967 785 discloses an apparatus for defibrating cellulose having a rotatable hopper and a milling cutter. U.S. Pat. No. 2 650 745, 3 483 906 and 3 615 059 disclose similar apparatus for grinding agricultural feedstuff. U.S. Pat. No. 4 412 659 describes a mill for shredding waste material having an adjustable grate for progressively feeding the material to the shredding wheel. DE 27 90 582 discloses the use of a hammer-mill to shred paper.
OBJECTS
The object of the present invention is to provide a shredder which is capable of shredding waste material with high throughput and of handling a mixture of different such materials randomly fed into the shredder. The shredder is intended to be able to cope with a wide variety of office waste paper, documents and other recording media, particularly that of a confidential or secret classification. For such an application it may be desirable to have the shredder mounted on a truck or trailer to allow it to shred such materials on-site so that the customer can satisfy himself that the material has indeed been safely disposed of. The invention thus also seeks to provide a transportable construction, which in addition enables the shredded waste to be reasonably compacted to minimise the volume of shredded material which must be taken away again.
SUMMARY OF THE INVENTION
The present invention provides a shredder for shredding bulk waste paper cardboard, packaging material, microfilm, microfiche and other sheet material, which comprises mounted for rotation about an upstanding axis, and having a stationary floor; the hopper for shredding material in the hopper, the hammer-mill comprising a plurality of flails loosely mounted to the circumference of a body rotatably mounted about a generally transverse axis; stationary hopper floor on the side of the hammer-mill where rotation of the mill tends to force material downwardly out of the hopper; floor and through which the shredded material passes when it has reached a chosen level of comminution; shredded material from the screen and to compact the shredded material, before discharging it from the duct past a non-return flap hingedly mounted at an outlet from the duct; and drive means arranged to drive the rotatable hopper, rotary hammer-mill and reciprocating bailer.
It has been found preferable to use a rotating hopper, which is circular in plan-view. The hopper is located above the hammer-mill, and the hammer-mill is preferably eccentrically located so that rotation of the hopper feeds material progressively over the hammer-mill. Usually, the hopper includes a paddle extending across it to feed the material to be shredded over the hammer-mill. In one construction, both the paddle and the walls of the hopper rotate together and this is found to be particularly advantageous. Alternatively, only the paddle is rotated.
The hammer-mill is arranged so that its upper portion protrudes into the receiving hopper so that as the hopper brings material over the hammer-mill it shaves off only a predetermined amount, thereby preventing clogging and overloading of the mill.
It has a
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patent: 2691338 (1954-10-01), Robbins
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patent: 4003502 (1977-01-01), Barcell
patent: 4106706 (1978-08-01), Burrows
patent: 4412659 (1983-11-01), Crawford et al.
patent: 4448361 (1984-05-01), Marcy
Derwent Abstract Accession No. J6798C/40, Class P12, SU, A, 716589 (Tselina Agric Mechn) 25 Feb. 1980 (25.02.80).
Hickey Colin J.
Rajewski Max R.
Formark Pty. Limited
Rosenbaum Mark
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