Versatile ultrahone sharpener

Details Versatile ultrahone sharpener Versatile ultrahone sharpener

2000-08-18

2001-07-31

Banks, Derris H. (Department: 3723)

Abrading

Machine

Rotary tool

C451S259000, C451S282000, C451S293000

Reexamination Certificate

active

06267652

ABSTRACT:

BACKGROUND OF INVENTION
Previous sharpeners disclosed in U.S. Pat. Nos. 5,611,726, 4,627,194, 4,897,965 and 5,005,319 describe a variety of sharpeners for knives and related tools and products where sharp edges are required.
U.S. Pat. No. 5,611,726 (marketed as a commercial sharpener) describes a two stage high speed sharpener particularly designed for applications where the user wants an extremely sharp edge with a measurable amount of “bite” on the resulting knife edge. This type of edge is particularly desired by commercial users.
SUMMARY OF INVENTION
The new and improved sharpener described here is much more versatile than any of the referenced sharpeners in that it allows the user with only one sharpener to select the type of edge he wishes to create. With this unique design one can create an ultrasharp edge with either substantial “bite”, a barely perceptible “bite”, or with an ultrasmooth edge with no bite. This is made possible by a unique three stage system that incorporates two stages each with cone shaped disks preferably of metal coated with abrasives which preferably are selected diamond abrasives and a third stage with cone shaped flexible stropping disks—composed of the novel abrasive loaded polymeric materials described in U.S. Pat. No. 5,611,726 or application Ser. No. 09/039,128 filed Mar. 13, 1998 and its provisional application Ser. No. 60/040,766. All of the details of said patent and applications are incorporated herein by reference thereto. In each stage the right and left facets forming the knife edge are sharpened alternately while the sharpening angle is controlled in each stage by two precision knife guides and springs, preferably elastomeric plastic springs as described in U.S. Pat. No. 5,611,726, to insure firm contact of the knife blade with the precision guides. The sharpening angle is increased in each successive stage in order to insure more effective sharpening and to create multi-beveled facets that will stay sharp longer. The magnetic based guides as described in U.S. Pat. Nos. 4,627,194; 4,716,689 and 4,897,965 also may be used to control the angle of the knife blade and hence the sharpening angle. All of the details of these patents are incorporated herein by reference thereto. For optimum results with this new sharpener the grit size of the abrasives used in each stage must be selected carefully. Other novel features disclosed here are precision stop-bars to control the position of the blade on the abrasive disks, motor mounting and shaft supporting means to permit the use of extended shafts to support multiple sharpening disks, and means to reshape and clean the sharpening disks after extended use.
The ability to rapidly create edges with a selected degree of “bite” or to eliminate the bite altogether and create an ultra smooth edge depends on the three stage design and on the use of a stropping disk of the optimum flexibility and with optimal loading of abrasive within a given range of abrasive particle size. While a variety of abrasive materials may be embedded in the stropping disks, alumina (alumina oxide) or Carborundum is preferred. Diamond grits also may be used in these stropping disks.


REFERENCES:
patent: 6113476 (2000-09-01), Friel, Sr. et al.

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