US3630460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper shredder
Assignee: Individual
•
Filing: 1969-10-20
•
Granted: 1971-12-28
•
Expires: 1989-10-20
Abstract
Abstract A shredding apparatus for paper and the like is defined by a pair of spaced, parallel counterrotating rolls provided with spaced-apart, cylindrical and overlapping shredding discs. The discs do not come into contact, for friction-free operation of the shredder and have sharp corners and a high friction surface finish for engaging inserted paper. The paper is stretched and thereby torn or shredded as it is engaged by the discs and passes between the rolls.
Inventors
- 👤 Albert Goldhammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:02
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/06; D21B1/08; B; B02; B02C; B02C18/00; B02C18/06; B02C18/14; B02C18/142; B02C18/16; B02C18/18; B02C18/182; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
Apparatus for shredding tearable material comprising a pair of shredding rolls, each including a plurality of axially spaced ribs forming troughs therebetween, with ribs of each roll meshing with ribs of the other roll in axial spaced relationship thereto and with each of said ribs having a sharp edge at each side, whereby to grip said tearable material when passing between said rolls as said ribs pull said tearable material into said troughs to effect tearing of such material along said sharp edges.
Claim 2
Dependent Claim
83 words
Apparatus for shredding tearable material comprising a pair of shredding rolls, each including a plurality of axially spaced ribs forming troughs therebetween, with ribs of each roll meshing with ribs of the other roll in axial spaced relationship thereto and with each of said ribs having a sharp edge at each side, whereby to grip said tearable material when passing between said rolls as said ribs pull said tearable material into said troughs to effect tearing of such material along said sharp edges.
Claim 3
Dependent Claim
29 words
Apparatus in accordance with claim 1, characterized by each of said ribs having substantially parallel side surfaces and substantially cylindrical surface connecting with said side surfaces in sharp edges.
Claim 4
Dependent Claim
54 words
Apparatus in accordance with claim 2, characterized by the substantially cylindrical surface of each of said ribs having axially directed markings therein, whereby to increase the grip of said ribs on tearable material passing between said rolls, while said ribs pull said tearable material into said troughs to effect tearing along said sharp edges.
Claim 5
Dependent Claim
30 words
Apparatus in accordance with claim 2, characterized by a spacing between each of said ribs and the proximate walls of its associated trough being of the order of 0.05-0.25 mm.
Claim 6
Dependent Claim
53 words
Apparatus in accordance with claim 4, characterized by each of said ribs on its cylindrical surface, having axially directed markings therein, whereby to increase the grip of said ribs on tearable material passing between said rolls, while said ribs pull said tearable material into said troughs to effect tearing along said sharp edges.
Claim 7
Dependent Claim
20 words
Apparatus in accordance with claim 3, characterized by means for rotating said rolls in opposite directions and at like speeds.
Claim 8
Dependent Claim
26 words
Apparatus in accordance with claim 6, characterized by the speed on the cylindrical surfaces of said ribs being of the order of 1.1-1.75 meters per second.
Claim 9
Dependent Claim
56 words
Apparatus in accordance with claim 3 characterized by a spacing between each of said ribs and the proximate walls of its associated trough being of the order of 0.05-1.75mm., and means for rotating said rolls in opposite directions with a speed on the cylindrical surfaces of said ribs of the order of 1.1-1.75 meters per second.
References Cited (Backward Citations)
US221744A
Cited
US313987A
Cited
US2236969A
Cited
US3190573A
Cited
US3396914A
Cited
US3529782A
Cited
US3502276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |