Cutting – Tool or tool with support – Stationary cutter
Reexamination Certificate
1999-12-30
2001-11-27
Bray, W. Donald (Department: 3725)
Cutting
Tool or tool with support
Stationary cutter
C083S857000, C144S184000, C144S190000
Reexamination Certificate
active
06321628
ABSTRACT:
This invention relates to a knife for cutting tuberous plants into bars and other shapes, in a direction whereby the tubers are driven through a cutting bloc in a hydraulic way, which cutting block is formed by crosswise mounted knives, situated above each other, which knives consist of a blade with an oblique cutting edge and a non set flat edge and which are further positioned with respect to each other in that said knives are positioned in sleeves provided perpendicularly to this cutting edge of the blade.
Examples of knifes of the type to which the invention relates can be clearly found a.o. in the following documents: EP 041 106 and NL 86 01 282 and U.S. Pat. No. 4,766,793.
The knifes described in those patents are positioned in a particular arrangement, above each other, in a cutting block, so that the tubers, mostly potatoes, are cut into bars, mostly French fries, mostly by means of an aqueous jet, at high velocity, through these crosswise arranged knives. In order to allow the knives of a row to be blocked with respect to a row underneath, the knives of an upper row are positioned through positioning sleeves in their lower oblique side, in the knives of a row underneath by means of positioning sleeves in the upper flat side.
These sleeves have the shape of rectangular recesses or recess that are slightly rounded at the bottom side. Although the knives should fit into each other with highest accuracy, and although the greatest care is given to this aspect when mounting the knives, it is always observed that fibres from the tubers built up in the bottom side of the sleeves at the oblique side (see FIG.
2
A). Although this building up may be rather insignificant, it nevertheless involves that the tubers (potatoes) is cut into the bars (French fries) are cut in an imperfect manner. In addition to this it is observed that after a period of time, the right angles that are formed at the cutting edge
2
, when applying the positioning sleeves
4
, tend to fold away at the points
4
′, so that as a consequence impurities emerge during the cutting. This is exemplified in FIG.
3
B. This folding away is caused by the contact of the edges
4
′ of the positioning sleeves
4
and the cutting edge
2
with the flank
5
of the knife underneath, when during the cutting the knives are forced somewhat apart by the tuber.
It is the aim of this invention to develop a knife of the above described type, which does not show the above described disadvantages and which allows to produce purely cut bars.
To achieve this according to the invention, each sleeve shows in the oblique side a slanting cut bottom side.
In a first possible embodiment said bottom side of the sleeve is formed by a flat or arcuate slanted cutting edge.
In a second possible embodiment, said bottom side of the sleeve is formed by the edge of a conical bore applied throughout the blade of the knife.
According to another possible embodiment, the bottom side of said sleeve is formed by the edge of an arcuate cut out provided in the blade of the knife.
REFERENCES:
patent: 1824798 (1931-09-01), Altfather
patent: 2487431 (1949-11-01), Floyd
patent: 2645262 (1953-07-01), Marasco
patent: 4766793 (1988-08-01), Fischer et al.
patent: 0 295 004 A2 (1988-12-01), None
patent: 643708 (1950-09-01), None
Bray W. Donald
Fitch Even Tabin & Flannery
Stumabo International N.V.
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