US3860180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for destroying documents
Assignee: Schleicher and Co International AG
•
Filing: 1973-03-14
•
Granted: 1975-01-14
•
Expires: 1993-03-14
Abstract
Abstract A method and apparatus for destroying documents in which opposed slitter rollers are provided which slit a document into longitudinal strips while the rollers are provided with means for cutting each longitudinal strip into a plurality of short sections.
Inventors
- 👤 Albert Goldhammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:44
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/0007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
THE METHOD OF DESTROYING A DOCUMENT WHICH COMPRISES: CUTTING THE DOCUMENT INTO NARROW LONGITUDINAL STRIPS WHILE SIMULTANEOUSLY FORMING EACH STRIP INTO SHORT SECTIONS, THE LONGITUDINAL STRIPS BEING FORMED BY MAKING SPACED PARALLEL SLITS IN THE DOCUMENT, AND THE LONGITUDINAL STRIPS BEING FORMED INTO SHORT SECTIONS BY MAKING TRANSVERSE INCISIONS IN THE DOCUMENT EACH OF WHICH EXTENDS OBLIQUELY FROM THE PATH OF ONE SLIT TO THE PATH OF AN ADJACENT SLIT, THE INCISIONS PERTAINING TO EACH STRIP BEING FORMED IN THE DOCUMENT IN LONGITUDINALLY DISTRIBUTED RELATION WITH EACH INCISION STAGGERED RELATIVE TO LATERALLY ADJACENT INCISIONS, THE TRANSVERSE INCISIONS BEING FORMED IN THE DOCUMENT IN ADVANCE OF THE FORMING OF THE SLITS INTERSECTED THEREBY AND SIMULTANEOUSLY WITH THE FORMING OF THE SLITS.
Claim 2
Independent Claim
120 words
THE METHOD OF DESTROYING A DOCUMENT WHICH COMPRISES: CUTTING THE DOCUMENT INTO NARROW LONGITUDINAL STRIPS WHILE SIMULTANEOUSLY FORMING EACH STRIP INTO SHORT SECTIONS, THE LONGITUDINAL STRIPS BEING FORMED BY MAKING SPACED PARALLEL SLITS IN THE DOCUMENT, AND THE LONGITUDINAL STRIPS BEING FORMED INTO SHORT SECTIONS BY MAKING TRANSVERSE INCISIONS IN THE DOCUMENT EACH OF WHICH EXTENDS OBLIQUELY FROM THE PATH OF ONE SLIT TO THE PATH OF AN ADJACENT SLIT, THE INCISIONS PERTAINING TO EACH STRIP BEING FORMED IN THE DOCUMENT IN LONGITUDINALLY DISTRIBUTED RELATION WITH EACH INCISION STAGGERED RELATIVE TO LATERALLY ADJACENT INCISIONS, THE TRANSVERSE INCISIONS BEING FORMED IN THE DOCUMENT IN ADVANCE OF THE FORMING OF THE SLITS INTERSECTED THEREBY AND SIMULTANEOUSLY WITH THE FORMING OF THE SLITS.
Claim 3
Dependent Claim
194 words
In a document shredder; a pair of counter rotating cutter rollers, each roller comprising axially spaced cutter discs having radial side faces and a cylindrical periphery with axial edges and with the cutter discs of each roller fitting closely between the cutter discs of the other roller whereby each adjacent pair of cutter disc edges forms a slitter, and means on the circumference of each cutter disc comprising the trailing edge of at least one axial notch formed in the periphery of the cutter discs pertaining to at least one roller for forming transverse interruptions in strips of the document formed by adjacent slitters, each said notch being inclined from side to side and being displaced circumferentially from the notch in adjacent cutter discs in such a manner that the notch pertaining to the cutter discs of each roller define at least one helical groove in the periphery of the respective roller, the side of each notch which is trailing when the respective roller is rotating forming an included angle with the periphery of the respective cutter disc where the side intersects the periphery which is smaller than 90* and greater than 75* .
Claim 4
Dependent Claim
194 words
In a document shredder; a pair of counter rotating cutter rollers, each roller comprising axially spaced cutter discs having radial side faces and a cylindrical periphery with axial edges and with the cutter discs of each roller fitting closely between the cutter discs of the other roller whereby each adjacent pair of cutter disc edges forms a slitter, and means on the circumference of each cutter disc comprising the trailing edge of at least one axial notch formed in the periphery of the cutter discs pertaining to at least one roller for forming transverse interruptions in strips of the document formed by adjacent slitters, each said notch being inclined from side to side and being displaced circumferentially from the notch in adjacent cutter discs in such a manner that the notch pertaining to the cutter discs of each roller define at least one helical groove in the periphery of the respective roller, the side of each notch which is trailing when the respective roller is rotating forming an included angle with the periphery of the respective cutter disc where the side intersects the periphery which is smaller than 90* and greater than 75* .
Claim 5
Dependent Claim
43 words
A document shredder according to claim 2 in which said rollers are provided with tensioning means comprising peripheral recess means formed in each said cutter disc in advance of each said notch for developing tensIon on the strips of a document being shredded.
Claim 6
Dependent Claim
13 words
A document shredder according to claim 2 in which said rollers are tubular.
Claim 7
Dependent Claim
31 words
A document shredder according to claim 2 which includes frame means, and bearings supporting the rollers in the frame means, adjacent ones of said bearings being disposed in axially displaced relation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |