Stone working – Sawing – Rotary
Reexamination Certificate
1999-03-04
2001-06-26
Hail, III, Joseph J. (Department: 3723)
Stone working
Sawing
Rotary
C125S011230, C125S020000, C451S021000, C451S542000, C116S208000
Reexamination Certificate
active
06250295
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention generally relates to tools. More particularly, it relates to a tool which is used for treatment of rock, masonry or concrete.
A tool, in particular for treatment of rock, masonry or concrete is disclosed for example in the European patent document EP-B-514 822 and formed as a rock drill. The rock drill is provided with eight cutting segments which are distributed over the periphery and composed of a plurality of bonded cutting bodies, in particular diamond crystals. During the working operations they are subjected to material-removing wear. The cutting segments are mounted on a tool base body. In order to differentiate different types of cutting segments, marks are provided in the cutting segments. They distinguish from the binding medium of the corresponding cutting segment by color and during a corresponding application of the tool can not be lost.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a tool of the above mentioned general type, in which the use condition of the tool can be determined in a simple manner without comparison with other, non-used tools.
In keeping with these objects and with others which will become apparent herein after, one feature president invention resides, briefly stated, in a tool, in particular for treatment of rock, masonry or concrete, for example by drilling, grinding or cutting off, which has a plurality of cutting segments composed of a plurality of bonded cutting grains such as diamond crystals and subjected during the operation to a material-removing wear, and which also has a tool base body which carries the cutting segments, wherein in accordance with the present invention at least one cutting segment has at least one mark which serves as a wear indicator for the tool, in that the at least one marking is arranged so that its appearance or property or its relative length to cutting surface of the cutting segment change during the use of the tool as a result of the wear.
When the tool is designed in accordance with the present invention, it provides for the above mentioned highly advantageous results.
In accordance with another feature of the present invention, the marking can be formed as an indicator provided on the tool and formed and as a scale with associated value data. It can be arranged at least partially on the tool base body, and applied after the production of the cutting segments on the tool, for example by a laser treatment. On the other hand, the mark can be also applied on the cutting segment during the manufacture of the tool.
In accordance with another feature of the present invention, the marking can be formed as at least one intermediate member provided in at least one cutting segment and having a cross-section which is changeable in the abrasion direction of the cutting segment. The intermediate member can be different from the cutting segment by color.
Also, the marking can be formed by differently deep axial notches in the outer periphery of the cutting segments, by several axial throughgoing openings in the cutting segment, by lines, etc.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
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WPI Abstract Accession No. 96-059150/23 Andde 44 24 203 A1.
Chanton Marzell
Chiesa Raphael
Jeiziner Daniel
Linder Walter
Hail III Joseph J.
Nguyen George
Scintilla AG
Striker Michael J.
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