Document shredding machine and method
US4997134A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1990 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Jan 16, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB02C2018/0046
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A document shredder for destroying a generally rectangular document and having feed rollers for engaging a marginal portion of a document and simultaneously spirally coiling the document into a generally cylindrical form while advancing the document in an axial direction. A rotary shredding mechanism cuts the leading end portion of the document as it is advanced by the feed rollers. The shredding mechanism may be arranged to cut the advancing document along a line of shear spaced inward of the leading edge of the leading end portion to trim successive strips from the leading end of the document. The shredding mechanism may also include chipping mechanism for reducing each strip to smaller bits as the strip is formed. The shredding mechanism may also include a rotary cutting element for cutting a series of generally parallel cuts in the document extending inward of the leading edge to form a succession of flag-like projections at the leading edge of the document which are thereafter sheared from the document by the shredding mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.