US3797765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper shredder
Assignee: Speed O Print Business Machines Corp
•
Filing: 1972-05-09
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Granted: 1974-03-19
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Expires: 1992-05-09
Abstract
Abstract A shredding device for paper and other material capable of being torn having a pair of oppositely rotating rolls, each with a plurality of circular discs thereon axially spaced apart along the length thereof is provided wherein the discs on one roll are received within the spaces between discs on the other roll and spaced from the faces thereof, and one circumferential edge of certain ones or all of said discs has a radius to cooperate with sharp circumferential edges on an adjacent disc thereby tearing and shredding the material. Comb teeth are located in the spaces between adjacent discs and are floatingly mounted to prevent jamming of the material being shredded.
Inventors
- 👤 A Samuels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:42
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/0007; B02C2018/0069
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
178 words
A device for shredding paper and like material comprising: a. a pair of rolls adapted to be rotated in opposite directions, b. a plurality of shredding discs on each of said rolls, each disc having two circumferential edges around its periphery and spaced apart axially along the length thereof, with the peripheries of the disc on one roll extending into the spaces between the discs on the other roll and spaced from the side faces thereof, c. friction surfaces on the circumference of each disc to pull material therethrough while the rolls are rotating, d. comb support means and a comb associated with each said roll having teeth thereon positioned between adjacent discs to prevent jamming of the material being shredded, and loosely mounted on said support means for floating moVement axially and transversely of said rolls, e. at least one of the circumferential edges of the discs on at least one of the rolls having a radius and being positioned adjacent the face of a disc on the other roll the circumferential edge of which is sharp.
Claim 2
Independent Claim
178 words
A device for shredding paper and like material comprising: a. a pair of rolls adapted to be rotated in opposite directions, b. a plurality of shredding discs on each of said rolls, each disc having two circumferential edges around its periphery and spaced apart axially along the length thereof, with the peripheries of the disc on one roll extending into the spaces between the discs on the other roll and spaced from the side faces thereof, c. friction surfaces on the circumference of each disc to pull material therethrough while the rolls are rotating, d. comb support means and a comb associated with each said roll having teeth thereon positioned between adjacent discs to prevent jamming of the material being shredded, and loosely mounted on said support means for floating moVement axially and transversely of said rolls, e. at least one of the circumferential edges of the discs on at least one of the rolls having a radius and being positioned adjacent the face of a disc on the other roll the circumferential edge of which is sharp.
Claim 3
Dependent Claim
29 words
A device for shredding paper and like material as defined in claim 1 wherein said radius on the circumferential edges of said discs is a maximum of .010 inches.
Claim 4
Dependent Claim
25 words
A device for shredding paper and like material as defined in claim 1 wherein said teeth on said comb are formed of a resilient material.
Claim 5
Dependent Claim
51 words
A device for shredding paper and like material as defined in claim 1, wherein said comb support means includes upper and lower support rods associated with each said roll, and each of said teeth being loosely mounted on said support rods, thereby to float between adjacent discs during the shredding operation.
Claim 6
Independent Claim
149 words
A device for shredding paper and like material comprising: a. a pair of rolls adapted to be rotated in opposite directions, b. a plurality of shredding discs on each of said rolls spaced apart axially along the length thereof, with the peripheries of the discs on one roll extending into the spaces between the discs on the other roll and spaced from the side faces thereof, c. friction surfaces on the circumference of each disc to pull material therethrough while the rolls are rotating, d. a comb associated with each said roll having teeth thereon positioned between adjacent discs to prevent jamming of the material being shredded, and e. one circumferential edge of each disc on each said roll having a radius which is a maximum of .010 inches and being positioned adjacent the face of a disc on the other roll, the circumferential edge of which is sharp.
Claim 7
Independent Claim
149 words
A device for shredding paper and like material comprising: a. a pair of rolls adapted to be rotated in opposite directions, b. a plurality of shredding discs on each of said rolls spaced apart axially along the length thereof, with the peripheries of the discs on one roll extending into the spaces between the discs on the other roll and spaced from the side faces thereof, c. friction surfaces on the circumference of each disc to pull material therethrough while the rolls are rotating, d. a comb associated with each said roll having teeth thereon positioned between adjacent discs to prevent jamming of the material being shredded, and e. one circumferential edge of each disc on each said roll having a radius which is a maximum of .010 inches and being positioned adjacent the face of a disc on the other roll, the circumferential edge of which is sharp.
Claim 8
Independent Claim
145 words
A device for shredding paper and like material comprising: a. a pair of rolls adapted to be rotated in opposite directions, b. a plurality of shredding discs on each of said rolls spaced apart axially along the length thereof, with the peripheries of the discs on one roll extending into the spaces between the discs on the other roll and spaced from the side faces thereof, c. friction surfaces on the circumference of each disc to pull material therethrough while the rolls are rotating, d. a comb associated with each said roll having teeth thereon positioned between adjacent discs to prevent jamming of the material being shredded, and e. both circumferential edges of each disc on one of said rolls having a radius which is a maximum of .010 inches and both circumferential edges of each disc on the other of said rolls being sharp.
Claim 9
Independent Claim
145 words
A device for shredding paper and like material comprising: a. a pair of rolls adapted to be rotated in opposite directions, b. a plurality of shredding discs on each of said rolls spaced apart axially along the length thereof, with the peripheries of the discs on one roll extending into the spaces between the discs on the other roll and spaced from the side faces thereof, c. friction surfaces on the circumference of each disc to pull material therethrough while the rolls are rotating, d. a comb associated with each said roll having teeth thereon positioned between adjacent discs to prevent jamming of the material being shredded, and e. both circumferential edges of each disc on one of said rolls having a radius which is a maximum of .010 inches and both circumferential edges of each disc on the other of said rolls being sharp.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |