# US 5,348,236 A · Impeller assembly for processing device

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- Number: US 5,348,236 A
- Document ID: US5348236A
- Status: Granted
- Kind: A
- Application number: 08/127,545
- Filed: 1993-09-28
- Granted: 1994-09-20
- Earliest claimed: 1993-09-28
- Assignees: The United States of America as represented by the Secretary of the Navy
- Inventors: John D. Spargo; John L. Drake, Jr.
- Web page: https://patentgrep.com/patent/US5348236A

## CPC

- B02C 18/0092: {for waste water or for garbage}
- B02C 18/12: with drive arranged below container {(B02C18/083 takes precedence)}
- D21B 1/345: {Pulpers}
- D21B 1/347: {Rotor assemblies}
- B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02})
- D21B: FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT

## Abstract

An impeller of an impeller assembly for a processing device has a spiral ove formed in a circumferential side face so that material entering a clearance space between the circumferential side face of the impeller and inner circumferential walls of the processing device is guided out of the clearance space when the impeller assembly is rotated. The spiral groove prevent material from lodging in the space and jamming the impeller assembly.

## Claims

### Claim 1

An impeller assembly for use in a material processing device of the type capable of processing both paper and plastic materials and having a material receiving area for receiving a material to be processed and an outlet for distance of the material after processing, the impeller assembly being structured and arranged for mounting in the processing device so as to be rotatable therein by driving means, wherein upon being mounted in a material processing device the impeller assembly functions to move the material from the receiving area toward the outlet when the impeller assembly is rotated, the impeller assembly comprising:
(a) connecting means for being connected with the driving means of the material processing device; and
(b) an impeller member attached for rotation with said connecting means, said impeller member being generally circular in shape and having a circumferential face extending between a top and a bottom face of said impeller member and a plurality of radially extending blades projecting axially from said top face, said circumferential face of said impeller member having a continuous spiral groove formed thereon, wherein upon being mounted in the material processing device said circumferential face is spaced from an inner circumferential wall of the processing device so as to define a clearance space therebetween,
said continuous spiral groove being a thread formed such that upon being mounted in the material processing device and being placed in rotation, material in the clearance space is guided upward out of the clearance space by the action of said thread,
whereby said continuous spiral groove functions as a screw-type pump to urge material in the clearance space out of the clearance space when said impeller member is rotated.

### Claim 2 (depends on 1)

The impeller assembly of claim 1, wherein said connecting means is a shaft, one end of said shaft being attached to said bottom face of said impeller member, and a second end of said shaft for connecting to the driving means.

### Claim 3 (depends on 1)

The impeller assembly of claim 1, wherein said thread in said impeller member is a right-handed thread having about four threads to the inch such that upon said impeller assembly being placed in rotation in a clockwise direction when viewed from above said to face, material in the clearance space is guided upward out of the clearance space by the action of said thread.

### Claim 4 (depends on 1)

The impeller assembly of claim 1, wherein said spiral groove is formed on the entire width of said circumferential face of said impeller member.

### Claim 5

A material processing device including an impeller assembly, the processing device capable of processing both paper and plastic materials and having a material receiving area for receiving the material to be processed and an outlet for discharge of the material after processing, the impeller assembly being structured and arranged in the processing device so as to be rotatable therein, the impeller assembly functioning to move the material from the receiving area toward the outlet when the impeller assembly is rotated, the processing device comprising:
(a) driving means;
(b) connecting means connected with said driving means for rotating said impeller assembly in said processing device;
(c) an impeller member attached for rotation with said connecting means, said impeller member causing the material to move from the receiving area toward the outlet when said impeller assembly is rotated by said driving means, said impeller member being generally circular in shape and having a circumferential face extending between a top and a bottom face of said impeller member and a plurality of radially extending blades projecting axially from said top face, said circumferential face being spaced away from an inner circumferential wall of said processing device so as to define a clearance space therebetween,
wherein a spiral groove is formed on said circumferential face of the impeller whereby said spiral groove functions as a screw-type pump impeller to urge material in said clearance space out of said clearance space when said impeller member is rotated; and
(d) a perforated screen, said perforated screen being arranged at the outlet to limit the size of material moving from the receiving area to the outlet.

### Claim 6 (depends on 5)

The processing device of claim 5, wherein the impeller assembly further comprises processing means for processing the material, said processing means being structured and arranged in the processing device so as to process the material moving from the receiving area toward the outlet.

### Claim 7 (depends on 6)

The processing device of claim 6, wherein said processing means comprises said plurality of blades attached to said top face of said impeller member, said plurality of blades coacting with stationary blades provided in the processing device so as to process the material.

### Claim 8 (depends on 5)

The processing device of claim 5, wherein said connecting means is a shaft, one end of said shaft being attached to said bottom face of said impeller member, and a second end of said shaft being connected to the driving means.

### Claim 9 (depends on 5)

The processing device of claim 5, wherein said bottom face of said impeller member is spaced away from an inner bottom wall of said processing device so as to define a bottom space therebetween, an inlet being provided in said inner bottom wall of said processing device for receiving water therethrough, wherein water entering said bottom space through said inlet flows through said clearance space into the material receiving are for combining with the material to be processed to form a slurry, and further wherein said spiral groove is a thread formed so that when said impeller assembly is rotated material in said clearance space is urged upward out of said clearance space toward the outlet of said processing device.

### Claim 10 (depends on 5)

The processing device of claim 5, wherein said circumferential face is spaced away from the inner circumferential walls of the processing device by a distance of about 0.020" so as to form said clearance space.

### Claim 11 (depends on 5)

The processing device of claim 5, wherein said driving means rotates said impeller assembly in a clockwise direction when viewed from above said top face, and said spiral groove on said impeller member is a right-handed thread formed so that when said impeller assembly is rotated, material in said clearance space is guided upward out of said clearance space.

### Claim 12 (depends on 11)

The processing device of claim 11, wherein said thread in said impeller member is about four threads to the inch.

### Claim 13 (depends on 5)

The processing device of claim 5, wherein said spiral groove is formed on the entire width of said circumferential face of said impeller member.

### Claim 14 (depends on 5)

The processing device of claim 5, further comprising a slurry chamber, said slurry chamber circumferentially surrounding said impeller member so that said clearance space is formed between said circumferential face of said impeller member and inner circumferential walls of said slurry chamber.