Patent Application
20100176231
1. Field of Invention
The invention relates to a shredder and, in particular, to a package-type break-preventing device for rotary shafts of a shredder.
2. Related Art
To prevent such documents as legal files, receipts, invoices, credit card numbers, research reports, or personal financial information (e.g., credit card and phone bills) from being released, it is common to destroy them using a shredder. Therefore, the shredder has become an indispensable device for both business and home applications.
A usual shredder includes a housing, a paper inlet on the front surface of the housing for inserting paper, and a shredder mechanism disposed inside the housing for shredding paper. The shredder mechanism includes cutting blades mounted on two parallel rotary shafts driven by a motor and a gearbox, thereby cutting passing paper into stripes or chips
Any given shredder has a sheet capacity according to its motor load and the strengths of the cutting blades and rotary shafts. When a lot of paper needs to be destroyed, the user has to follow the sheet capacity when inserting paper. Otherwise, inserting too much paper at a time can easily cause a paper jam. Moreover, the rotary shafts may bend when it is overloaded. If no appropriate supporting components are provided on the outer sides of the rotary shafts to balance the bending moment, the rotary shafts may even break, making the shredder out of order.
Therefore, to prevent the rotary shafts from bending under a large external force, it is necessary to provide appropriate supporting components on the outer sides of the rotary shafts.
In view of the foregoing, an objective of the invention is to provide a package-type break-preventing device for rotary shafts of a shredder. It consists of two bent boards, each of which has a horizontal upper board, a vertical side board, a horizontal lower board, and a vertical base. When the two boards are connected and fixed on the machine frame and tail frame, the rotary shafts and stripper are enclosed within the space formed by the two boards. The vertical side board and the horizontal lower board directly urge against the stripper, providing a supporting effect on the rotary shafts. The rotary shafts therefore do not break under an external force due to the supporting force. This achieves the goal of preventing the rotary shafts from deformation under an external force.
The invention will become more fully understood from the detailed description given herein below illustration only, and thus is not limitative of the present invention, and wherein:
The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
When a user inserts too many sheets of paper into the rotary shafts 23 via the paper inlet of the shredder, the blades 24 are stuck to result in a paper jam. At this moment, the rotary shafts 23 may bend outward as they are overloaded. If there is no appropriate device to balance the bending moment, the rotary shafts 23 are likely to break.
The disclosed package-type break-preventing device that prevents rotary shafts from bending under an external includes two bent metal boards 3. Any of the metal boards has a horizontal upper board 31, a vertical side board 32, a horizontal lower board 33, and a vertical base 34. Both sides of the horizontal upper board 31, the vertical side board 32, and the horizontal lower board 33 have tenons for connections with the tenon holes 5 on the machine frame 11 and the tail frame 12, respectively.
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Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.
