Maro Publications



from 3/5/2013

Maro Encyclopedia


Patent Abstracts

Patent Titles




ďA shredder shreds private, confidential or sensitive documents or files into small pieces to render information thereon unreadable. A conventional shredder has a cutting device mounted in a housing. The cutting device has two driving shafts, multiple shredding blades and multiple partitions. The driving shafts are parallelly mounted rotatably on the housing, are driven by a motor through a gear set and are rotated toward opposite directions. The shredding blades are mounted securely on the driving shafts and are rotated along with the driving shafts. The partitions are mounted on the driving shafts and disposed between the shredding blades to keep the shredding blades from hitting each other.

However, the conventional shredder has the following disadvantages. Since the driving shafts are disposed on the housing only with their ends mounted rotatably on the housing, when the conventional shredder shreds a stack of paper at a time, the driving shafts, especially middles of the driving shafts, are pulled by the stack of paper and are deformed easily. Thus, the papers are not shredded completely, and the ends of the driving shafts disengage from the gear set or push the gear set so the gear set and the motor break down. A conventional way to avoid deformation of the driving shaft is to increase thickness of the driving shafts and/or making the driving shafts with tough materials. However, manufacturing costs are also increased.

[Shredding, US Patent 8,382,020 (2/26/2013)]

1. Shredding is cutting by tearing. (RDC 3/5/2013)


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(RDC 6/5/2012)


Roger D. Corneliussen

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921


Copyright 2013 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen

* Date of latest addition; date of first entry is 3/5/2013.